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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012 Regents of the University of California
4 * Copyright (C) 2019 Western Digital Corporation or its affiliates.
5 * Copyright (C) 2020 FORTH-ICS/CARV
6 * Nick Kossifidis <mick@ics.forth.gr>
7 */
8
9#include <linux/init.h>
10#include <linux/mm.h>
11#include <linux/memblock.h>
12#include <linux/initrd.h>
13#include <linux/swap.h>
14#include <linux/swiotlb.h>
15#include <linux/sizes.h>
16#include <linux/of_fdt.h>
17#include <linux/of_reserved_mem.h>
18#include <linux/libfdt.h>
19#include <linux/set_memory.h>
20#include <linux/dma-map-ops.h>
21#include <linux/crash_dump.h>
22#include <linux/hugetlb.h>
23
24#include <asm/fixmap.h>
25#include <asm/tlbflush.h>
26#include <asm/sections.h>
27#include <asm/soc.h>
28#include <asm/io.h>
29#include <asm/ptdump.h>
30#include <asm/numa.h>
31
32#include "../kernel/head.h"
33
34struct kernel_mapping kernel_map __ro_after_init;
35EXPORT_SYMBOL(kernel_map);
36#ifdef CONFIG_XIP_KERNEL
37#define kernel_map (*(struct kernel_mapping *)XIP_FIXUP(&kernel_map))
38#endif
39
40#ifdef CONFIG_64BIT
41u64 satp_mode __ro_after_init = !IS_ENABLED(CONFIG_XIP_KERNEL) ? SATP_MODE_57 : SATP_MODE_39;
42#else
43u64 satp_mode __ro_after_init = SATP_MODE_32;
44#endif
45EXPORT_SYMBOL(satp_mode);
46
47bool pgtable_l4_enabled = IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL);
48bool pgtable_l5_enabled = IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL);
49EXPORT_SYMBOL(pgtable_l4_enabled);
50EXPORT_SYMBOL(pgtable_l5_enabled);
51
52phys_addr_t phys_ram_base __ro_after_init;
53EXPORT_SYMBOL(phys_ram_base);
54
55unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
56 __page_aligned_bss;
57EXPORT_SYMBOL(empty_zero_page);
58
59extern char _start[];
60#define DTB_EARLY_BASE_VA PGDIR_SIZE
61void *_dtb_early_va __initdata;
62uintptr_t _dtb_early_pa __initdata;
63
64static phys_addr_t dma32_phys_limit __initdata;
65
66static void __init zone_sizes_init(void)
67{
68 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
69
70#ifdef CONFIG_ZONE_DMA32
71 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
72#endif
73 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
74
75 free_area_init(max_zone_pfns);
76}
77
78#if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
79
80#define LOG2_SZ_1K ilog2(SZ_1K)
81#define LOG2_SZ_1M ilog2(SZ_1M)
82#define LOG2_SZ_1G ilog2(SZ_1G)
83#define LOG2_SZ_1T ilog2(SZ_1T)
84
85static inline void print_mlk(char *name, unsigned long b, unsigned long t)
86{
87 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
88 (((t) - (b)) >> LOG2_SZ_1K));
89}
90
91static inline void print_mlm(char *name, unsigned long b, unsigned long t)
92{
93 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
94 (((t) - (b)) >> LOG2_SZ_1M));
95}
96
97static inline void print_mlg(char *name, unsigned long b, unsigned long t)
98{
99 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld GB)\n", name, b, t,
100 (((t) - (b)) >> LOG2_SZ_1G));
101}
102
103#ifdef CONFIG_64BIT
104static inline void print_mlt(char *name, unsigned long b, unsigned long t)
105{
106 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld TB)\n", name, b, t,
107 (((t) - (b)) >> LOG2_SZ_1T));
108}
109#else
110#define print_mlt(n, b, t) do {} while (0)
111#endif
112
113static inline void print_ml(char *name, unsigned long b, unsigned long t)
114{
115 unsigned long diff = t - b;
116
117 if (IS_ENABLED(CONFIG_64BIT) && (diff >> LOG2_SZ_1T) >= 10)
118 print_mlt(name, b, t);
119 else if ((diff >> LOG2_SZ_1G) >= 10)
120 print_mlg(name, b, t);
121 else if ((diff >> LOG2_SZ_1M) >= 10)
122 print_mlm(name, b, t);
123 else
124 print_mlk(name, b, t);
125}
126
127static void __init print_vm_layout(void)
128{
129 pr_notice("Virtual kernel memory layout:\n");
130 print_ml("fixmap", (unsigned long)FIXADDR_START,
131 (unsigned long)FIXADDR_TOP);
132 print_ml("pci io", (unsigned long)PCI_IO_START,
133 (unsigned long)PCI_IO_END);
134 print_ml("vmemmap", (unsigned long)VMEMMAP_START,
135 (unsigned long)VMEMMAP_END);
136 print_ml("vmalloc", (unsigned long)VMALLOC_START,
137 (unsigned long)VMALLOC_END);
138#ifdef CONFIG_64BIT
139 print_ml("modules", (unsigned long)MODULES_VADDR,
140 (unsigned long)MODULES_END);
141#endif
142 print_ml("lowmem", (unsigned long)PAGE_OFFSET,
143 (unsigned long)high_memory);
144 if (IS_ENABLED(CONFIG_64BIT)) {
145#ifdef CONFIG_KASAN
146 print_ml("kasan", KASAN_SHADOW_START, KASAN_SHADOW_END);
147#endif
148
149 print_ml("kernel", (unsigned long)KERNEL_LINK_ADDR,
150 (unsigned long)ADDRESS_SPACE_END);
151 }
152}
153#else
154static void print_vm_layout(void) { }
155#endif /* CONFIG_DEBUG_VM */
156
157void __init mem_init(void)
158{
159#ifdef CONFIG_FLATMEM
160 BUG_ON(!mem_map);
161#endif /* CONFIG_FLATMEM */
162
163 swiotlb_init(max_pfn > PFN_DOWN(dma32_phys_limit), SWIOTLB_VERBOSE);
164 memblock_free_all();
165
166 print_vm_layout();
167}
168
169/* Limit the memory size via mem. */
170static phys_addr_t memory_limit;
171
172static int __init early_mem(char *p)
173{
174 u64 size;
175
176 if (!p)
177 return 1;
178
179 size = memparse(p, &p) & PAGE_MASK;
180 memory_limit = min_t(u64, size, memory_limit);
181
182 pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20);
183
184 return 0;
185}
186early_param("mem", early_mem);
187
188static void __init setup_bootmem(void)
189{
190 phys_addr_t vmlinux_end = __pa_symbol(&_end);
191 phys_addr_t max_mapped_addr;
192 phys_addr_t phys_ram_end, vmlinux_start;
193
194 if (IS_ENABLED(CONFIG_XIP_KERNEL))
195 vmlinux_start = __pa_symbol(&_sdata);
196 else
197 vmlinux_start = __pa_symbol(&_start);
198
199 memblock_enforce_memory_limit(memory_limit);
200
201 /*
202 * Make sure we align the reservation on PMD_SIZE since we will
203 * map the kernel in the linear mapping as read-only: we do not want
204 * any allocation to happen between _end and the next pmd aligned page.
205 */
206 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_STRICT_KERNEL_RWX))
207 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK;
208 /*
209 * Reserve from the start of the kernel to the end of the kernel
210 */
211 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
212
213 phys_ram_end = memblock_end_of_DRAM();
214 if (!IS_ENABLED(CONFIG_XIP_KERNEL))
215 phys_ram_base = memblock_start_of_DRAM();
216 /*
217 * memblock allocator is not aware of the fact that last 4K bytes of
218 * the addressable memory can not be mapped because of IS_ERR_VALUE
219 * macro. Make sure that last 4k bytes are not usable by memblock
220 * if end of dram is equal to maximum addressable memory. For 64-bit
221 * kernel, this problem can't happen here as the end of the virtual
222 * address space is occupied by the kernel mapping then this check must
223 * be done as soon as the kernel mapping base address is determined.
224 */
225 if (!IS_ENABLED(CONFIG_64BIT)) {
226 max_mapped_addr = __pa(~(ulong)0);
227 if (max_mapped_addr == (phys_ram_end - 1))
228 memblock_set_current_limit(max_mapped_addr - 4096);
229 }
230
231 min_low_pfn = PFN_UP(phys_ram_base);
232 max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end);
233 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
234
235 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
236 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
237
238 reserve_initrd_mem();
239 /*
240 * If DTB is built in, no need to reserve its memblock.
241 * Otherwise, do reserve it but avoid using
242 * early_init_fdt_reserve_self() since __pa() does
243 * not work for DTB pointers that are fixmap addresses
244 */
245 if (!IS_ENABLED(CONFIG_BUILTIN_DTB)) {
246 /*
247 * In case the DTB is not located in a memory region we won't
248 * be able to locate it later on via the linear mapping and
249 * get a segfault when accessing it via __va(dtb_early_pa).
250 * To avoid this situation copy DTB to a memory region.
251 * Note that memblock_phys_alloc will also reserve DTB region.
252 */
253 if (!memblock_is_memory(dtb_early_pa)) {
254 size_t fdt_size = fdt_totalsize(dtb_early_va);
255 phys_addr_t new_dtb_early_pa = memblock_phys_alloc(fdt_size, PAGE_SIZE);
256 void *new_dtb_early_va = early_memremap(new_dtb_early_pa, fdt_size);
257
258 memcpy(new_dtb_early_va, dtb_early_va, fdt_size);
259 early_memunmap(new_dtb_early_va, fdt_size);
260 _dtb_early_pa = new_dtb_early_pa;
261 } else
262 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
263 }
264
265 dma_contiguous_reserve(dma32_phys_limit);
266 if (IS_ENABLED(CONFIG_64BIT))
267 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
268 memblock_allow_resize();
269}
270
271#ifdef CONFIG_MMU
272struct pt_alloc_ops pt_ops __initdata;
273
274unsigned long riscv_pfn_base __ro_after_init;
275EXPORT_SYMBOL(riscv_pfn_base);
276
277pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
278pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
279static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
280
281pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
282static p4d_t __maybe_unused early_dtb_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE);
283static pud_t __maybe_unused early_dtb_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE);
284static pmd_t __maybe_unused early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
285
286#ifdef CONFIG_XIP_KERNEL
287#define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops))
288#define riscv_pfn_base (*(unsigned long *)XIP_FIXUP(&riscv_pfn_base))
289#define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir))
290#define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte))
291#define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir))
292#endif /* CONFIG_XIP_KERNEL */
293
294static const pgprot_t protection_map[16] = {
295 [VM_NONE] = PAGE_NONE,
296 [VM_READ] = PAGE_READ,
297 [VM_WRITE] = PAGE_COPY,
298 [VM_WRITE | VM_READ] = PAGE_COPY,
299 [VM_EXEC] = PAGE_EXEC,
300 [VM_EXEC | VM_READ] = PAGE_READ_EXEC,
301 [VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC,
302 [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_READ_EXEC,
303 [VM_SHARED] = PAGE_NONE,
304 [VM_SHARED | VM_READ] = PAGE_READ,
305 [VM_SHARED | VM_WRITE] = PAGE_SHARED,
306 [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
307 [VM_SHARED | VM_EXEC] = PAGE_EXEC,
308 [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READ_EXEC,
309 [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC,
310 [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC
311};
312DECLARE_VM_GET_PAGE_PROT
313
314void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
315{
316 unsigned long addr = __fix_to_virt(idx);
317 pte_t *ptep;
318
319 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
320
321 ptep = &fixmap_pte[pte_index(addr)];
322
323 if (pgprot_val(prot))
324 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
325 else
326 pte_clear(&init_mm, addr, ptep);
327 local_flush_tlb_page(addr);
328}
329
330static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
331{
332 return (pte_t *)((uintptr_t)pa);
333}
334
335static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
336{
337 clear_fixmap(FIX_PTE);
338 return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
339}
340
341static inline pte_t *__init get_pte_virt_late(phys_addr_t pa)
342{
343 return (pte_t *) __va(pa);
344}
345
346static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
347{
348 /*
349 * We only create PMD or PGD early mappings so we
350 * should never reach here with MMU disabled.
351 */
352 BUG();
353}
354
355static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
356{
357 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
358}
359
360static phys_addr_t __init alloc_pte_late(uintptr_t va)
361{
362 unsigned long vaddr;
363
364 vaddr = __get_free_page(GFP_KERNEL);
365 BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)));
366
367 return __pa(vaddr);
368}
369
370static void __init create_pte_mapping(pte_t *ptep,
371 uintptr_t va, phys_addr_t pa,
372 phys_addr_t sz, pgprot_t prot)
373{
374 uintptr_t pte_idx = pte_index(va);
375
376 BUG_ON(sz != PAGE_SIZE);
377
378 if (pte_none(ptep[pte_idx]))
379 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
380}
381
382#ifndef __PAGETABLE_PMD_FOLDED
383
384static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
385static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
386static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
387
388#ifdef CONFIG_XIP_KERNEL
389#define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd))
390#define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd))
391#define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd))
392#endif /* CONFIG_XIP_KERNEL */
393
394static p4d_t trampoline_p4d[PTRS_PER_P4D] __page_aligned_bss;
395static p4d_t fixmap_p4d[PTRS_PER_P4D] __page_aligned_bss;
396static p4d_t early_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE);
397
398#ifdef CONFIG_XIP_KERNEL
399#define trampoline_p4d ((p4d_t *)XIP_FIXUP(trampoline_p4d))
400#define fixmap_p4d ((p4d_t *)XIP_FIXUP(fixmap_p4d))
401#define early_p4d ((p4d_t *)XIP_FIXUP(early_p4d))
402#endif /* CONFIG_XIP_KERNEL */
403
404static pud_t trampoline_pud[PTRS_PER_PUD] __page_aligned_bss;
405static pud_t fixmap_pud[PTRS_PER_PUD] __page_aligned_bss;
406static pud_t early_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE);
407
408#ifdef CONFIG_XIP_KERNEL
409#define trampoline_pud ((pud_t *)XIP_FIXUP(trampoline_pud))
410#define fixmap_pud ((pud_t *)XIP_FIXUP(fixmap_pud))
411#define early_pud ((pud_t *)XIP_FIXUP(early_pud))
412#endif /* CONFIG_XIP_KERNEL */
413
414static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
415{
416 /* Before MMU is enabled */
417 return (pmd_t *)((uintptr_t)pa);
418}
419
420static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
421{
422 clear_fixmap(FIX_PMD);
423 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
424}
425
426static pmd_t *__init get_pmd_virt_late(phys_addr_t pa)
427{
428 return (pmd_t *) __va(pa);
429}
430
431static phys_addr_t __init alloc_pmd_early(uintptr_t va)
432{
433 BUG_ON((va - kernel_map.virt_addr) >> PUD_SHIFT);
434
435 return (uintptr_t)early_pmd;
436}
437
438static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
439{
440 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
441}
442
443static phys_addr_t __init alloc_pmd_late(uintptr_t va)
444{
445 unsigned long vaddr;
446
447 vaddr = __get_free_page(GFP_KERNEL);
448 BUG_ON(!vaddr || !pgtable_pmd_page_ctor(virt_to_page(vaddr)));
449
450 return __pa(vaddr);
451}
452
453static void __init create_pmd_mapping(pmd_t *pmdp,
454 uintptr_t va, phys_addr_t pa,
455 phys_addr_t sz, pgprot_t prot)
456{
457 pte_t *ptep;
458 phys_addr_t pte_phys;
459 uintptr_t pmd_idx = pmd_index(va);
460
461 if (sz == PMD_SIZE) {
462 if (pmd_none(pmdp[pmd_idx]))
463 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
464 return;
465 }
466
467 if (pmd_none(pmdp[pmd_idx])) {
468 pte_phys = pt_ops.alloc_pte(va);
469 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
470 ptep = pt_ops.get_pte_virt(pte_phys);
471 memset(ptep, 0, PAGE_SIZE);
472 } else {
473 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
474 ptep = pt_ops.get_pte_virt(pte_phys);
475 }
476
477 create_pte_mapping(ptep, va, pa, sz, prot);
478}
479
480static pud_t *__init get_pud_virt_early(phys_addr_t pa)
481{
482 return (pud_t *)((uintptr_t)pa);
483}
484
485static pud_t *__init get_pud_virt_fixmap(phys_addr_t pa)
486{
487 clear_fixmap(FIX_PUD);
488 return (pud_t *)set_fixmap_offset(FIX_PUD, pa);
489}
490
491static pud_t *__init get_pud_virt_late(phys_addr_t pa)
492{
493 return (pud_t *)__va(pa);
494}
495
496static phys_addr_t __init alloc_pud_early(uintptr_t va)
497{
498 /* Only one PUD is available for early mapping */
499 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT);
500
501 return (uintptr_t)early_pud;
502}
503
504static phys_addr_t __init alloc_pud_fixmap(uintptr_t va)
505{
506 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
507}
508
509static phys_addr_t alloc_pud_late(uintptr_t va)
510{
511 unsigned long vaddr;
512
513 vaddr = __get_free_page(GFP_KERNEL);
514 BUG_ON(!vaddr);
515 return __pa(vaddr);
516}
517
518static p4d_t *__init get_p4d_virt_early(phys_addr_t pa)
519{
520 return (p4d_t *)((uintptr_t)pa);
521}
522
523static p4d_t *__init get_p4d_virt_fixmap(phys_addr_t pa)
524{
525 clear_fixmap(FIX_P4D);
526 return (p4d_t *)set_fixmap_offset(FIX_P4D, pa);
527}
528
529static p4d_t *__init get_p4d_virt_late(phys_addr_t pa)
530{
531 return (p4d_t *)__va(pa);
532}
533
534static phys_addr_t __init alloc_p4d_early(uintptr_t va)
535{
536 /* Only one P4D is available for early mapping */
537 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT);
538
539 return (uintptr_t)early_p4d;
540}
541
542static phys_addr_t __init alloc_p4d_fixmap(uintptr_t va)
543{
544 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
545}
546
547static phys_addr_t alloc_p4d_late(uintptr_t va)
548{
549 unsigned long vaddr;
550
551 vaddr = __get_free_page(GFP_KERNEL);
552 BUG_ON(!vaddr);
553 return __pa(vaddr);
554}
555
556static void __init create_pud_mapping(pud_t *pudp,
557 uintptr_t va, phys_addr_t pa,
558 phys_addr_t sz, pgprot_t prot)
559{
560 pmd_t *nextp;
561 phys_addr_t next_phys;
562 uintptr_t pud_index = pud_index(va);
563
564 if (sz == PUD_SIZE) {
565 if (pud_val(pudp[pud_index]) == 0)
566 pudp[pud_index] = pfn_pud(PFN_DOWN(pa), prot);
567 return;
568 }
569
570 if (pud_val(pudp[pud_index]) == 0) {
571 next_phys = pt_ops.alloc_pmd(va);
572 pudp[pud_index] = pfn_pud(PFN_DOWN(next_phys), PAGE_TABLE);
573 nextp = pt_ops.get_pmd_virt(next_phys);
574 memset(nextp, 0, PAGE_SIZE);
575 } else {
576 next_phys = PFN_PHYS(_pud_pfn(pudp[pud_index]));
577 nextp = pt_ops.get_pmd_virt(next_phys);
578 }
579
580 create_pmd_mapping(nextp, va, pa, sz, prot);
581}
582
583static void __init create_p4d_mapping(p4d_t *p4dp,
584 uintptr_t va, phys_addr_t pa,
585 phys_addr_t sz, pgprot_t prot)
586{
587 pud_t *nextp;
588 phys_addr_t next_phys;
589 uintptr_t p4d_index = p4d_index(va);
590
591 if (sz == P4D_SIZE) {
592 if (p4d_val(p4dp[p4d_index]) == 0)
593 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(pa), prot);
594 return;
595 }
596
597 if (p4d_val(p4dp[p4d_index]) == 0) {
598 next_phys = pt_ops.alloc_pud(va);
599 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(next_phys), PAGE_TABLE);
600 nextp = pt_ops.get_pud_virt(next_phys);
601 memset(nextp, 0, PAGE_SIZE);
602 } else {
603 next_phys = PFN_PHYS(_p4d_pfn(p4dp[p4d_index]));
604 nextp = pt_ops.get_pud_virt(next_phys);
605 }
606
607 create_pud_mapping(nextp, va, pa, sz, prot);
608}
609
610#define pgd_next_t p4d_t
611#define alloc_pgd_next(__va) (pgtable_l5_enabled ? \
612 pt_ops.alloc_p4d(__va) : (pgtable_l4_enabled ? \
613 pt_ops.alloc_pud(__va) : pt_ops.alloc_pmd(__va)))
614#define get_pgd_next_virt(__pa) (pgtable_l5_enabled ? \
615 pt_ops.get_p4d_virt(__pa) : (pgd_next_t *)(pgtable_l4_enabled ? \
616 pt_ops.get_pud_virt(__pa) : (pud_t *)pt_ops.get_pmd_virt(__pa)))
617#define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
618 (pgtable_l5_enabled ? \
619 create_p4d_mapping(__nextp, __va, __pa, __sz, __prot) : \
620 (pgtable_l4_enabled ? \
621 create_pud_mapping((pud_t *)__nextp, __va, __pa, __sz, __prot) : \
622 create_pmd_mapping((pmd_t *)__nextp, __va, __pa, __sz, __prot)))
623#define fixmap_pgd_next (pgtable_l5_enabled ? \
624 (uintptr_t)fixmap_p4d : (pgtable_l4_enabled ? \
625 (uintptr_t)fixmap_pud : (uintptr_t)fixmap_pmd))
626#define trampoline_pgd_next (pgtable_l5_enabled ? \
627 (uintptr_t)trampoline_p4d : (pgtable_l4_enabled ? \
628 (uintptr_t)trampoline_pud : (uintptr_t)trampoline_pmd))
629#define early_dtb_pgd_next (pgtable_l5_enabled ? \
630 (uintptr_t)early_dtb_p4d : (pgtable_l4_enabled ? \
631 (uintptr_t)early_dtb_pud : (uintptr_t)early_dtb_pmd))
632#else
633#define pgd_next_t pte_t
634#define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
635#define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
636#define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
637 create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
638#define fixmap_pgd_next ((uintptr_t)fixmap_pte)
639#define early_dtb_pgd_next ((uintptr_t)early_dtb_pmd)
640#define create_p4d_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
641#define create_pud_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
642#define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
643#endif /* __PAGETABLE_PMD_FOLDED */
644
645void __init create_pgd_mapping(pgd_t *pgdp,
646 uintptr_t va, phys_addr_t pa,
647 phys_addr_t sz, pgprot_t prot)
648{
649 pgd_next_t *nextp;
650 phys_addr_t next_phys;
651 uintptr_t pgd_idx = pgd_index(va);
652
653 if (sz == PGDIR_SIZE) {
654 if (pgd_val(pgdp[pgd_idx]) == 0)
655 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
656 return;
657 }
658
659 if (pgd_val(pgdp[pgd_idx]) == 0) {
660 next_phys = alloc_pgd_next(va);
661 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
662 nextp = get_pgd_next_virt(next_phys);
663 memset(nextp, 0, PAGE_SIZE);
664 } else {
665 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
666 nextp = get_pgd_next_virt(next_phys);
667 }
668
669 create_pgd_next_mapping(nextp, va, pa, sz, prot);
670}
671
672static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
673{
674 /* Upgrade to PMD_SIZE mappings whenever possible */
675 base &= PMD_SIZE - 1;
676 if (!base && size >= PMD_SIZE)
677 return PMD_SIZE;
678
679 return PAGE_SIZE;
680}
681
682#ifdef CONFIG_XIP_KERNEL
683#define phys_ram_base (*(phys_addr_t *)XIP_FIXUP(&phys_ram_base))
684extern char _xiprom[], _exiprom[], __data_loc;
685
686/* called from head.S with MMU off */
687asmlinkage void __init __copy_data(void)
688{
689 void *from = (void *)(&__data_loc);
690 void *to = (void *)CONFIG_PHYS_RAM_BASE;
691 size_t sz = (size_t)((uintptr_t)(&_end) - (uintptr_t)(&_sdata));
692
693 memcpy(to, from, sz);
694}
695#endif
696
697#ifdef CONFIG_STRICT_KERNEL_RWX
698static __init pgprot_t pgprot_from_va(uintptr_t va)
699{
700 if (is_va_kernel_text(va))
701 return PAGE_KERNEL_READ_EXEC;
702
703 /*
704 * In 64-bit kernel, the kernel mapping is outside the linear mapping so
705 * we must protect its linear mapping alias from being executed and
706 * written.
707 * And rodata section is marked readonly in mark_rodata_ro.
708 */
709 if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va))
710 return PAGE_KERNEL_READ;
711
712 return PAGE_KERNEL;
713}
714
715void mark_rodata_ro(void)
716{
717 set_kernel_memory(__start_rodata, _data, set_memory_ro);
718 if (IS_ENABLED(CONFIG_64BIT))
719 set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data),
720 set_memory_ro);
721
722 debug_checkwx();
723}
724#else
725static __init pgprot_t pgprot_from_va(uintptr_t va)
726{
727 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va))
728 return PAGE_KERNEL;
729
730 return PAGE_KERNEL_EXEC;
731}
732#endif /* CONFIG_STRICT_KERNEL_RWX */
733
734#if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL)
735static void __init disable_pgtable_l5(void)
736{
737 pgtable_l5_enabled = false;
738 kernel_map.page_offset = PAGE_OFFSET_L4;
739 satp_mode = SATP_MODE_48;
740}
741
742static void __init disable_pgtable_l4(void)
743{
744 pgtable_l4_enabled = false;
745 kernel_map.page_offset = PAGE_OFFSET_L3;
746 satp_mode = SATP_MODE_39;
747}
748
749/*
750 * There is a simple way to determine if 4-level is supported by the
751 * underlying hardware: establish 1:1 mapping in 4-level page table mode
752 * then read SATP to see if the configuration was taken into account
753 * meaning sv48 is supported.
754 */
755static __init void set_satp_mode(void)
756{
757 u64 identity_satp, hw_satp;
758 uintptr_t set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK;
759 bool check_l4 = false;
760
761 create_p4d_mapping(early_p4d,
762 set_satp_mode_pmd, (uintptr_t)early_pud,
763 P4D_SIZE, PAGE_TABLE);
764 create_pud_mapping(early_pud,
765 set_satp_mode_pmd, (uintptr_t)early_pmd,
766 PUD_SIZE, PAGE_TABLE);
767 /* Handle the case where set_satp_mode straddles 2 PMDs */
768 create_pmd_mapping(early_pmd,
769 set_satp_mode_pmd, set_satp_mode_pmd,
770 PMD_SIZE, PAGE_KERNEL_EXEC);
771 create_pmd_mapping(early_pmd,
772 set_satp_mode_pmd + PMD_SIZE,
773 set_satp_mode_pmd + PMD_SIZE,
774 PMD_SIZE, PAGE_KERNEL_EXEC);
775retry:
776 create_pgd_mapping(early_pg_dir,
777 set_satp_mode_pmd,
778 check_l4 ? (uintptr_t)early_pud : (uintptr_t)early_p4d,
779 PGDIR_SIZE, PAGE_TABLE);
780
781 identity_satp = PFN_DOWN((uintptr_t)&early_pg_dir) | satp_mode;
782
783 local_flush_tlb_all();
784 csr_write(CSR_SATP, identity_satp);
785 hw_satp = csr_swap(CSR_SATP, 0ULL);
786 local_flush_tlb_all();
787
788 if (hw_satp != identity_satp) {
789 if (!check_l4) {
790 disable_pgtable_l5();
791 check_l4 = true;
792 memset(early_pg_dir, 0, PAGE_SIZE);
793 goto retry;
794 }
795 disable_pgtable_l4();
796 }
797
798 memset(early_pg_dir, 0, PAGE_SIZE);
799 memset(early_p4d, 0, PAGE_SIZE);
800 memset(early_pud, 0, PAGE_SIZE);
801 memset(early_pmd, 0, PAGE_SIZE);
802}
803#endif
804
805/*
806 * setup_vm() is called from head.S with MMU-off.
807 *
808 * Following requirements should be honoured for setup_vm() to work
809 * correctly:
810 * 1) It should use PC-relative addressing for accessing kernel symbols.
811 * To achieve this we always use GCC cmodel=medany.
812 * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
813 * so disable compiler instrumentation when FTRACE is enabled.
814 *
815 * Currently, the above requirements are honoured by using custom CFLAGS
816 * for init.o in mm/Makefile.
817 */
818
819#ifndef __riscv_cmodel_medany
820#error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
821#endif
822
823#ifdef CONFIG_XIP_KERNEL
824static void __init create_kernel_page_table(pgd_t *pgdir,
825 __always_unused bool early)
826{
827 uintptr_t va, end_va;
828
829 /* Map the flash resident part */
830 end_va = kernel_map.virt_addr + kernel_map.xiprom_sz;
831 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE)
832 create_pgd_mapping(pgdir, va,
833 kernel_map.xiprom + (va - kernel_map.virt_addr),
834 PMD_SIZE, PAGE_KERNEL_EXEC);
835
836 /* Map the data in RAM */
837 end_va = kernel_map.virt_addr + XIP_OFFSET + kernel_map.size;
838 for (va = kernel_map.virt_addr + XIP_OFFSET; va < end_va; va += PMD_SIZE)
839 create_pgd_mapping(pgdir, va,
840 kernel_map.phys_addr + (va - (kernel_map.virt_addr + XIP_OFFSET)),
841 PMD_SIZE, PAGE_KERNEL);
842}
843#else
844static void __init create_kernel_page_table(pgd_t *pgdir, bool early)
845{
846 uintptr_t va, end_va;
847
848 end_va = kernel_map.virt_addr + kernel_map.size;
849 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE)
850 create_pgd_mapping(pgdir, va,
851 kernel_map.phys_addr + (va - kernel_map.virt_addr),
852 PMD_SIZE,
853 early ?
854 PAGE_KERNEL_EXEC : pgprot_from_va(va));
855}
856#endif
857
858/*
859 * Setup a 4MB mapping that encompasses the device tree: for 64-bit kernel,
860 * this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR
861 * entry.
862 */
863static void __init create_fdt_early_page_table(pgd_t *pgdir, uintptr_t dtb_pa)
864{
865#ifndef CONFIG_BUILTIN_DTB
866 uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1);
867
868 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
869 IS_ENABLED(CONFIG_64BIT) ? early_dtb_pgd_next : pa,
870 PGDIR_SIZE,
871 IS_ENABLED(CONFIG_64BIT) ? PAGE_TABLE : PAGE_KERNEL);
872
873 if (pgtable_l5_enabled)
874 create_p4d_mapping(early_dtb_p4d, DTB_EARLY_BASE_VA,
875 (uintptr_t)early_dtb_pud, P4D_SIZE, PAGE_TABLE);
876
877 if (pgtable_l4_enabled)
878 create_pud_mapping(early_dtb_pud, DTB_EARLY_BASE_VA,
879 (uintptr_t)early_dtb_pmd, PUD_SIZE, PAGE_TABLE);
880
881 if (IS_ENABLED(CONFIG_64BIT)) {
882 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
883 pa, PMD_SIZE, PAGE_KERNEL);
884 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
885 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
886 }
887
888 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
889#else
890 /*
891 * For 64-bit kernel, __va can't be used since it would return a linear
892 * mapping address whereas dtb_early_va will be used before
893 * setup_vm_final installs the linear mapping. For 32-bit kernel, as the
894 * kernel is mapped in the linear mapping, that makes no difference.
895 */
896 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));
897#endif
898
899 dtb_early_pa = dtb_pa;
900}
901
902/*
903 * MMU is not enabled, the page tables are allocated directly using
904 * early_pmd/pud/p4d and the address returned is the physical one.
905 */
906static void __init pt_ops_set_early(void)
907{
908 pt_ops.alloc_pte = alloc_pte_early;
909 pt_ops.get_pte_virt = get_pte_virt_early;
910#ifndef __PAGETABLE_PMD_FOLDED
911 pt_ops.alloc_pmd = alloc_pmd_early;
912 pt_ops.get_pmd_virt = get_pmd_virt_early;
913 pt_ops.alloc_pud = alloc_pud_early;
914 pt_ops.get_pud_virt = get_pud_virt_early;
915 pt_ops.alloc_p4d = alloc_p4d_early;
916 pt_ops.get_p4d_virt = get_p4d_virt_early;
917#endif
918}
919
920/*
921 * MMU is enabled but page table setup is not complete yet.
922 * fixmap page table alloc functions must be used as a means to temporarily
923 * map the allocated physical pages since the linear mapping does not exist yet.
924 *
925 * Note that this is called with MMU disabled, hence kernel_mapping_pa_to_va,
926 * but it will be used as described above.
927 */
928static void __init pt_ops_set_fixmap(void)
929{
930 pt_ops.alloc_pte = kernel_mapping_pa_to_va(alloc_pte_fixmap);
931 pt_ops.get_pte_virt = kernel_mapping_pa_to_va(get_pte_virt_fixmap);
932#ifndef __PAGETABLE_PMD_FOLDED
933 pt_ops.alloc_pmd = kernel_mapping_pa_to_va(alloc_pmd_fixmap);
934 pt_ops.get_pmd_virt = kernel_mapping_pa_to_va(get_pmd_virt_fixmap);
935 pt_ops.alloc_pud = kernel_mapping_pa_to_va(alloc_pud_fixmap);
936 pt_ops.get_pud_virt = kernel_mapping_pa_to_va(get_pud_virt_fixmap);
937 pt_ops.alloc_p4d = kernel_mapping_pa_to_va(alloc_p4d_fixmap);
938 pt_ops.get_p4d_virt = kernel_mapping_pa_to_va(get_p4d_virt_fixmap);
939#endif
940}
941
942/*
943 * MMU is enabled and page table setup is complete, so from now, we can use
944 * generic page allocation functions to setup page table.
945 */
946static void __init pt_ops_set_late(void)
947{
948 pt_ops.alloc_pte = alloc_pte_late;
949 pt_ops.get_pte_virt = get_pte_virt_late;
950#ifndef __PAGETABLE_PMD_FOLDED
951 pt_ops.alloc_pmd = alloc_pmd_late;
952 pt_ops.get_pmd_virt = get_pmd_virt_late;
953 pt_ops.alloc_pud = alloc_pud_late;
954 pt_ops.get_pud_virt = get_pud_virt_late;
955 pt_ops.alloc_p4d = alloc_p4d_late;
956 pt_ops.get_p4d_virt = get_p4d_virt_late;
957#endif
958}
959
960asmlinkage void __init setup_vm(uintptr_t dtb_pa)
961{
962 pmd_t __maybe_unused fix_bmap_spmd, fix_bmap_epmd;
963
964 kernel_map.virt_addr = KERNEL_LINK_ADDR;
965 kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL);
966
967#ifdef CONFIG_XIP_KERNEL
968 kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR;
969 kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom);
970
971 phys_ram_base = CONFIG_PHYS_RAM_BASE;
972 kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE;
973 kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_sdata);
974
975 kernel_map.va_kernel_xip_pa_offset = kernel_map.virt_addr - kernel_map.xiprom;
976#else
977 kernel_map.phys_addr = (uintptr_t)(&_start);
978 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr;
979#endif
980
981#if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL)
982 set_satp_mode();
983#endif
984
985 kernel_map.va_pa_offset = PAGE_OFFSET - kernel_map.phys_addr;
986 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
987
988 riscv_pfn_base = PFN_DOWN(kernel_map.phys_addr);
989
990 /*
991 * The default maximal physical memory size is KERN_VIRT_SIZE for 32-bit
992 * kernel, whereas for 64-bit kernel, the end of the virtual address
993 * space is occupied by the modules/BPF/kernel mappings which reduces
994 * the available size of the linear mapping.
995 */
996 memory_limit = KERN_VIRT_SIZE - (IS_ENABLED(CONFIG_64BIT) ? SZ_4G : 0);
997
998 /* Sanity check alignment and size */
999 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
1000 BUG_ON((kernel_map.phys_addr % PMD_SIZE) != 0);
1001
1002#ifdef CONFIG_64BIT
1003 /*
1004 * The last 4K bytes of the addressable memory can not be mapped because
1005 * of IS_ERR_VALUE macro.
1006 */
1007 BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K);
1008#endif
1009
1010 apply_early_boot_alternatives();
1011 pt_ops_set_early();
1012
1013 /* Setup early PGD for fixmap */
1014 create_pgd_mapping(early_pg_dir, FIXADDR_START,
1015 fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
1016
1017#ifndef __PAGETABLE_PMD_FOLDED
1018 /* Setup fixmap P4D and PUD */
1019 if (pgtable_l5_enabled)
1020 create_p4d_mapping(fixmap_p4d, FIXADDR_START,
1021 (uintptr_t)fixmap_pud, P4D_SIZE, PAGE_TABLE);
1022 /* Setup fixmap PUD and PMD */
1023 if (pgtable_l4_enabled)
1024 create_pud_mapping(fixmap_pud, FIXADDR_START,
1025 (uintptr_t)fixmap_pmd, PUD_SIZE, PAGE_TABLE);
1026 create_pmd_mapping(fixmap_pmd, FIXADDR_START,
1027 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
1028 /* Setup trampoline PGD and PMD */
1029 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
1030 trampoline_pgd_next, PGDIR_SIZE, PAGE_TABLE);
1031 if (pgtable_l5_enabled)
1032 create_p4d_mapping(trampoline_p4d, kernel_map.virt_addr,
1033 (uintptr_t)trampoline_pud, P4D_SIZE, PAGE_TABLE);
1034 if (pgtable_l4_enabled)
1035 create_pud_mapping(trampoline_pud, kernel_map.virt_addr,
1036 (uintptr_t)trampoline_pmd, PUD_SIZE, PAGE_TABLE);
1037#ifdef CONFIG_XIP_KERNEL
1038 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
1039 kernel_map.xiprom, PMD_SIZE, PAGE_KERNEL_EXEC);
1040#else
1041 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
1042 kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC);
1043#endif
1044#else
1045 /* Setup trampoline PGD */
1046 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
1047 kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC);
1048#endif
1049
1050 /*
1051 * Setup early PGD covering entire kernel which will allow
1052 * us to reach paging_init(). We map all memory banks later
1053 * in setup_vm_final() below.
1054 */
1055 create_kernel_page_table(early_pg_dir, true);
1056
1057 /* Setup early mapping for FDT early scan */
1058 create_fdt_early_page_table(early_pg_dir, dtb_pa);
1059
1060 /*
1061 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
1062 * range can not span multiple pmds.
1063 */
1064 BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
1065 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
1066
1067#ifndef __PAGETABLE_PMD_FOLDED
1068 /*
1069 * Early ioremap fixmap is already created as it lies within first 2MB
1070 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
1071 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
1072 * the user if not.
1073 */
1074 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
1075 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
1076 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
1077 WARN_ON(1);
1078 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
1079 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
1080 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
1081 fix_to_virt(FIX_BTMAP_BEGIN));
1082 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
1083 fix_to_virt(FIX_BTMAP_END));
1084
1085 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
1086 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
1087 }
1088#endif
1089
1090 pt_ops_set_fixmap();
1091}
1092
1093static void __init setup_vm_final(void)
1094{
1095 uintptr_t va, map_size;
1096 phys_addr_t pa, start, end;
1097 u64 i;
1098
1099 /* Setup swapper PGD for fixmap */
1100 create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
1101 __pa_symbol(fixmap_pgd_next),
1102 PGDIR_SIZE, PAGE_TABLE);
1103
1104 /* Map all memory banks in the linear mapping */
1105 for_each_mem_range(i, &start, &end) {
1106 if (start >= end)
1107 break;
1108 if (start <= __pa(PAGE_OFFSET) &&
1109 __pa(PAGE_OFFSET) < end)
1110 start = __pa(PAGE_OFFSET);
1111 if (end >= __pa(PAGE_OFFSET) + memory_limit)
1112 end = __pa(PAGE_OFFSET) + memory_limit;
1113
1114 for (pa = start; pa < end; pa += map_size) {
1115 va = (uintptr_t)__va(pa);
1116 map_size = best_map_size(pa, end - pa);
1117
1118 create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
1119 pgprot_from_va(va));
1120 }
1121 }
1122
1123 /* Map the kernel */
1124 if (IS_ENABLED(CONFIG_64BIT))
1125 create_kernel_page_table(swapper_pg_dir, false);
1126
1127#ifdef CONFIG_KASAN
1128 kasan_swapper_init();
1129#endif
1130
1131 /* Clear fixmap PTE and PMD mappings */
1132 clear_fixmap(FIX_PTE);
1133 clear_fixmap(FIX_PMD);
1134 clear_fixmap(FIX_PUD);
1135 clear_fixmap(FIX_P4D);
1136
1137 /* Move to swapper page table */
1138 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | satp_mode);
1139 local_flush_tlb_all();
1140
1141 pt_ops_set_late();
1142}
1143#else
1144asmlinkage void __init setup_vm(uintptr_t dtb_pa)
1145{
1146 dtb_early_va = (void *)dtb_pa;
1147 dtb_early_pa = dtb_pa;
1148}
1149
1150static inline void setup_vm_final(void)
1151{
1152}
1153#endif /* CONFIG_MMU */
1154
1155/*
1156 * reserve_crashkernel() - reserves memory for crash kernel
1157 *
1158 * This function reserves memory area given in "crashkernel=" kernel command
1159 * line parameter. The memory reserved is used by dump capture kernel when
1160 * primary kernel is crashing.
1161 */
1162static void __init reserve_crashkernel(void)
1163{
1164 unsigned long long crash_base = 0;
1165 unsigned long long crash_size = 0;
1166 unsigned long search_start = memblock_start_of_DRAM();
1167 unsigned long search_end = memblock_end_of_DRAM();
1168
1169 int ret = 0;
1170
1171 if (!IS_ENABLED(CONFIG_KEXEC_CORE))
1172 return;
1173 /*
1174 * Don't reserve a region for a crash kernel on a crash kernel
1175 * since it doesn't make much sense and we have limited memory
1176 * resources.
1177 */
1178 if (is_kdump_kernel()) {
1179 pr_info("crashkernel: ignoring reservation request\n");
1180 return;
1181 }
1182
1183 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
1184 &crash_size, &crash_base);
1185 if (ret || !crash_size)
1186 return;
1187
1188 crash_size = PAGE_ALIGN(crash_size);
1189
1190 if (crash_base) {
1191 search_start = crash_base;
1192 search_end = crash_base + crash_size;
1193 }
1194
1195 /*
1196 * Current riscv boot protocol requires 2MB alignment for
1197 * RV64 and 4MB alignment for RV32 (hugepage size)
1198 *
1199 * Try to alloc from 32bit addressible physical memory so that
1200 * swiotlb can work on the crash kernel.
1201 */
1202 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
1203 search_start,
1204 min(search_end, (unsigned long) SZ_4G));
1205 if (crash_base == 0) {
1206 /* Try again without restricting region to 32bit addressible memory */
1207 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
1208 search_start, search_end);
1209 if (crash_base == 0) {
1210 pr_warn("crashkernel: couldn't allocate %lldKB\n",
1211 crash_size >> 10);
1212 return;
1213 }
1214 }
1215
1216 pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n",
1217 crash_base, crash_base + crash_size, crash_size >> 20);
1218
1219 crashk_res.start = crash_base;
1220 crashk_res.end = crash_base + crash_size - 1;
1221}
1222
1223void __init paging_init(void)
1224{
1225 setup_bootmem();
1226 setup_vm_final();
1227}
1228
1229void __init misc_mem_init(void)
1230{
1231 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
1232 arch_numa_init();
1233 sparse_init();
1234 zone_sizes_init();
1235 reserve_crashkernel();
1236 memblock_dump_all();
1237}
1238
1239#ifdef CONFIG_SPARSEMEM_VMEMMAP
1240int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
1241 struct vmem_altmap *altmap)
1242{
1243 return vmemmap_populate_basepages(start, end, node, NULL);
1244}
1245#endif
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012 Regents of the University of California
4 * Copyright (C) 2019 Western Digital Corporation or its affiliates.
5 * Copyright (C) 2020 FORTH-ICS/CARV
6 * Nick Kossifidis <mick@ics.forth.gr>
7 */
8
9#include <linux/init.h>
10#include <linux/mm.h>
11#include <linux/memblock.h>
12#include <linux/initrd.h>
13#include <linux/swap.h>
14#include <linux/swiotlb.h>
15#include <linux/sizes.h>
16#include <linux/of_fdt.h>
17#include <linux/of_reserved_mem.h>
18#include <linux/libfdt.h>
19#include <linux/set_memory.h>
20#include <linux/dma-map-ops.h>
21#include <linux/crash_dump.h>
22#include <linux/hugetlb.h>
23#ifdef CONFIG_RELOCATABLE
24#include <linux/elf.h>
25#endif
26#include <linux/kfence.h>
27#include <linux/execmem.h>
28
29#include <asm/fixmap.h>
30#include <asm/io.h>
31#include <asm/kasan.h>
32#include <asm/numa.h>
33#include <asm/pgtable.h>
34#include <asm/sections.h>
35#include <asm/soc.h>
36#include <asm/sparsemem.h>
37#include <asm/tlbflush.h>
38
39#include "../kernel/head.h"
40
41u64 new_vmalloc[NR_CPUS / sizeof(u64) + 1];
42
43struct kernel_mapping kernel_map __ro_after_init;
44EXPORT_SYMBOL(kernel_map);
45#ifdef CONFIG_XIP_KERNEL
46#define kernel_map (*(struct kernel_mapping *)XIP_FIXUP(&kernel_map))
47#endif
48
49#ifdef CONFIG_64BIT
50u64 satp_mode __ro_after_init = !IS_ENABLED(CONFIG_XIP_KERNEL) ? SATP_MODE_57 : SATP_MODE_39;
51#else
52u64 satp_mode __ro_after_init = SATP_MODE_32;
53#endif
54EXPORT_SYMBOL(satp_mode);
55
56#ifdef CONFIG_64BIT
57bool pgtable_l4_enabled __ro_after_init = !IS_ENABLED(CONFIG_XIP_KERNEL);
58bool pgtable_l5_enabled __ro_after_init = !IS_ENABLED(CONFIG_XIP_KERNEL);
59EXPORT_SYMBOL(pgtable_l4_enabled);
60EXPORT_SYMBOL(pgtable_l5_enabled);
61#endif
62
63phys_addr_t phys_ram_base __ro_after_init;
64EXPORT_SYMBOL(phys_ram_base);
65
66#ifdef CONFIG_SPARSEMEM_VMEMMAP
67#define VMEMMAP_ADDR_ALIGN (1ULL << SECTION_SIZE_BITS)
68
69unsigned long vmemmap_start_pfn __ro_after_init;
70EXPORT_SYMBOL(vmemmap_start_pfn);
71#endif
72
73unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
74 __page_aligned_bss;
75EXPORT_SYMBOL(empty_zero_page);
76
77extern char _start[];
78void *_dtb_early_va __initdata;
79uintptr_t _dtb_early_pa __initdata;
80
81phys_addr_t dma32_phys_limit __initdata;
82
83static void __init zone_sizes_init(void)
84{
85 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
86
87#ifdef CONFIG_ZONE_DMA32
88 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
89#endif
90 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
91
92 free_area_init(max_zone_pfns);
93}
94
95#if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
96
97#define LOG2_SZ_1K ilog2(SZ_1K)
98#define LOG2_SZ_1M ilog2(SZ_1M)
99#define LOG2_SZ_1G ilog2(SZ_1G)
100#define LOG2_SZ_1T ilog2(SZ_1T)
101
102static inline void print_mlk(char *name, unsigned long b, unsigned long t)
103{
104 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
105 (((t) - (b)) >> LOG2_SZ_1K));
106}
107
108static inline void print_mlm(char *name, unsigned long b, unsigned long t)
109{
110 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
111 (((t) - (b)) >> LOG2_SZ_1M));
112}
113
114static inline void print_mlg(char *name, unsigned long b, unsigned long t)
115{
116 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld GB)\n", name, b, t,
117 (((t) - (b)) >> LOG2_SZ_1G));
118}
119
120#ifdef CONFIG_64BIT
121static inline void print_mlt(char *name, unsigned long b, unsigned long t)
122{
123 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld TB)\n", name, b, t,
124 (((t) - (b)) >> LOG2_SZ_1T));
125}
126#else
127#define print_mlt(n, b, t) do {} while (0)
128#endif
129
130static inline void print_ml(char *name, unsigned long b, unsigned long t)
131{
132 unsigned long diff = t - b;
133
134 if (IS_ENABLED(CONFIG_64BIT) && (diff >> LOG2_SZ_1T) >= 10)
135 print_mlt(name, b, t);
136 else if ((diff >> LOG2_SZ_1G) >= 10)
137 print_mlg(name, b, t);
138 else if ((diff >> LOG2_SZ_1M) >= 10)
139 print_mlm(name, b, t);
140 else
141 print_mlk(name, b, t);
142}
143
144static void __init print_vm_layout(void)
145{
146 pr_notice("Virtual kernel memory layout:\n");
147 print_ml("fixmap", (unsigned long)FIXADDR_START,
148 (unsigned long)FIXADDR_TOP);
149 print_ml("pci io", (unsigned long)PCI_IO_START,
150 (unsigned long)PCI_IO_END);
151 print_ml("vmemmap", (unsigned long)VMEMMAP_START,
152 (unsigned long)VMEMMAP_END);
153 print_ml("vmalloc", (unsigned long)VMALLOC_START,
154 (unsigned long)VMALLOC_END);
155#ifdef CONFIG_64BIT
156 print_ml("modules", (unsigned long)MODULES_VADDR,
157 (unsigned long)MODULES_END);
158#endif
159 print_ml("lowmem", (unsigned long)PAGE_OFFSET,
160 (unsigned long)high_memory);
161 if (IS_ENABLED(CONFIG_64BIT)) {
162#ifdef CONFIG_KASAN
163 print_ml("kasan", KASAN_SHADOW_START, KASAN_SHADOW_END);
164#endif
165
166 print_ml("kernel", (unsigned long)kernel_map.virt_addr,
167 (unsigned long)ADDRESS_SPACE_END);
168 }
169}
170#else
171static void print_vm_layout(void) { }
172#endif /* CONFIG_DEBUG_VM */
173
174void __init mem_init(void)
175{
176 bool swiotlb = max_pfn > PFN_DOWN(dma32_phys_limit);
177#ifdef CONFIG_FLATMEM
178 BUG_ON(!mem_map);
179#endif /* CONFIG_FLATMEM */
180
181 if (IS_ENABLED(CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC) && !swiotlb &&
182 dma_cache_alignment != 1) {
183 /*
184 * If no bouncing needed for ZONE_DMA, allocate 1MB swiotlb
185 * buffer per 1GB of RAM for kmalloc() bouncing on
186 * non-coherent platforms.
187 */
188 unsigned long size =
189 DIV_ROUND_UP(memblock_phys_mem_size(), 1024);
190 swiotlb_adjust_size(min(swiotlb_size_or_default(), size));
191 swiotlb = true;
192 }
193
194 swiotlb_init(swiotlb, SWIOTLB_VERBOSE);
195 memblock_free_all();
196
197 print_vm_layout();
198}
199
200/* Limit the memory size via mem. */
201static phys_addr_t memory_limit;
202#ifdef CONFIG_XIP_KERNEL
203#define memory_limit (*(phys_addr_t *)XIP_FIXUP(&memory_limit))
204#endif /* CONFIG_XIP_KERNEL */
205
206static int __init early_mem(char *p)
207{
208 u64 size;
209
210 if (!p)
211 return 1;
212
213 size = memparse(p, &p) & PAGE_MASK;
214 memory_limit = min_t(u64, size, memory_limit);
215
216 pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20);
217
218 return 0;
219}
220early_param("mem", early_mem);
221
222static void __init setup_bootmem(void)
223{
224 phys_addr_t vmlinux_end = __pa_symbol(&_end);
225 phys_addr_t max_mapped_addr;
226 phys_addr_t phys_ram_end, vmlinux_start;
227
228 if (IS_ENABLED(CONFIG_XIP_KERNEL))
229 vmlinux_start = __pa_symbol(&_sdata);
230 else
231 vmlinux_start = __pa_symbol(&_start);
232
233 memblock_enforce_memory_limit(memory_limit);
234
235 /*
236 * Make sure we align the reservation on PMD_SIZE since we will
237 * map the kernel in the linear mapping as read-only: we do not want
238 * any allocation to happen between _end and the next pmd aligned page.
239 */
240 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_STRICT_KERNEL_RWX))
241 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK;
242 /*
243 * Reserve from the start of the kernel to the end of the kernel
244 */
245 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
246
247 /*
248 * Make sure we align the start of the memory on a PMD boundary so that
249 * at worst, we map the linear mapping with PMD mappings.
250 */
251 if (!IS_ENABLED(CONFIG_XIP_KERNEL)) {
252 phys_ram_base = memblock_start_of_DRAM() & PMD_MASK;
253#ifdef CONFIG_SPARSEMEM_VMEMMAP
254 vmemmap_start_pfn = round_down(phys_ram_base, VMEMMAP_ADDR_ALIGN) >> PAGE_SHIFT;
255#endif
256 }
257
258 /*
259 * In 64-bit, any use of __va/__pa before this point is wrong as we
260 * did not know the start of DRAM before.
261 */
262 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_MMU))
263 kernel_map.va_pa_offset = PAGE_OFFSET - phys_ram_base;
264
265 /*
266 * The size of the linear page mapping may restrict the amount of
267 * usable RAM.
268 */
269 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_MMU)) {
270 max_mapped_addr = __pa(PAGE_OFFSET) + KERN_VIRT_SIZE;
271 memblock_cap_memory_range(phys_ram_base,
272 max_mapped_addr - phys_ram_base);
273 }
274
275 /*
276 * Reserve physical address space that would be mapped to virtual
277 * addresses greater than (void *)(-PAGE_SIZE) because:
278 * - This memory would overlap with ERR_PTR
279 * - This memory belongs to high memory, which is not supported
280 *
281 * This is not applicable to 64-bit kernel, because virtual addresses
282 * after (void *)(-PAGE_SIZE) are not linearly mapped: they are
283 * occupied by kernel mapping. Also it is unrealistic for high memory
284 * to exist on 64-bit platforms.
285 */
286 if (!IS_ENABLED(CONFIG_64BIT)) {
287 max_mapped_addr = __va_to_pa_nodebug(-PAGE_SIZE);
288 memblock_reserve(max_mapped_addr, (phys_addr_t)-max_mapped_addr);
289 }
290
291 phys_ram_end = memblock_end_of_DRAM();
292 min_low_pfn = PFN_UP(phys_ram_base);
293 max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end);
294 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
295
296 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
297 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
298
299 reserve_initrd_mem();
300
301 /*
302 * No allocation should be done before reserving the memory as defined
303 * in the device tree, otherwise the allocation could end up in a
304 * reserved region.
305 */
306 early_init_fdt_scan_reserved_mem();
307
308 /*
309 * If DTB is built in, no need to reserve its memblock.
310 * Otherwise, do reserve it but avoid using
311 * early_init_fdt_reserve_self() since __pa() does
312 * not work for DTB pointers that are fixmap addresses
313 */
314 if (!IS_ENABLED(CONFIG_BUILTIN_DTB))
315 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
316
317 dma_contiguous_reserve(dma32_phys_limit);
318 if (IS_ENABLED(CONFIG_64BIT))
319 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
320}
321
322#ifdef CONFIG_MMU
323struct pt_alloc_ops pt_ops __meminitdata;
324
325pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
326pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
327static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
328
329pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
330
331#ifdef CONFIG_XIP_KERNEL
332#define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops))
333#define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir))
334#define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte))
335#define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir))
336#endif /* CONFIG_XIP_KERNEL */
337
338static const pgprot_t protection_map[16] = {
339 [VM_NONE] = PAGE_NONE,
340 [VM_READ] = PAGE_READ,
341 [VM_WRITE] = PAGE_COPY,
342 [VM_WRITE | VM_READ] = PAGE_COPY,
343 [VM_EXEC] = PAGE_EXEC,
344 [VM_EXEC | VM_READ] = PAGE_READ_EXEC,
345 [VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC,
346 [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_EXEC,
347 [VM_SHARED] = PAGE_NONE,
348 [VM_SHARED | VM_READ] = PAGE_READ,
349 [VM_SHARED | VM_WRITE] = PAGE_SHARED,
350 [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
351 [VM_SHARED | VM_EXEC] = PAGE_EXEC,
352 [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READ_EXEC,
353 [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC,
354 [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC
355};
356DECLARE_VM_GET_PAGE_PROT
357
358void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
359{
360 unsigned long addr = __fix_to_virt(idx);
361 pte_t *ptep;
362
363 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
364
365 ptep = &fixmap_pte[pte_index(addr)];
366
367 if (pgprot_val(prot))
368 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
369 else
370 pte_clear(&init_mm, addr, ptep);
371 local_flush_tlb_page(addr);
372}
373
374static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
375{
376 return (pte_t *)((uintptr_t)pa);
377}
378
379static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
380{
381 clear_fixmap(FIX_PTE);
382 return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
383}
384
385static inline pte_t *__meminit get_pte_virt_late(phys_addr_t pa)
386{
387 return (pte_t *) __va(pa);
388}
389
390static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
391{
392 /*
393 * We only create PMD or PGD early mappings so we
394 * should never reach here with MMU disabled.
395 */
396 BUG();
397}
398
399static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
400{
401 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
402}
403
404static phys_addr_t __meminit alloc_pte_late(uintptr_t va)
405{
406 struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0);
407
408 BUG_ON(!ptdesc || !pagetable_pte_ctor(ptdesc));
409 return __pa((pte_t *)ptdesc_address(ptdesc));
410}
411
412static void __meminit create_pte_mapping(pte_t *ptep, uintptr_t va, phys_addr_t pa, phys_addr_t sz,
413 pgprot_t prot)
414{
415 uintptr_t pte_idx = pte_index(va);
416
417 BUG_ON(sz != PAGE_SIZE);
418
419 if (pte_none(ptep[pte_idx]))
420 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
421}
422
423#ifndef __PAGETABLE_PMD_FOLDED
424
425static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
426static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
427static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
428
429#ifdef CONFIG_XIP_KERNEL
430#define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd))
431#define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd))
432#define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd))
433#endif /* CONFIG_XIP_KERNEL */
434
435static p4d_t trampoline_p4d[PTRS_PER_P4D] __page_aligned_bss;
436static p4d_t fixmap_p4d[PTRS_PER_P4D] __page_aligned_bss;
437static p4d_t early_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE);
438
439#ifdef CONFIG_XIP_KERNEL
440#define trampoline_p4d ((p4d_t *)XIP_FIXUP(trampoline_p4d))
441#define fixmap_p4d ((p4d_t *)XIP_FIXUP(fixmap_p4d))
442#define early_p4d ((p4d_t *)XIP_FIXUP(early_p4d))
443#endif /* CONFIG_XIP_KERNEL */
444
445static pud_t trampoline_pud[PTRS_PER_PUD] __page_aligned_bss;
446static pud_t fixmap_pud[PTRS_PER_PUD] __page_aligned_bss;
447static pud_t early_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE);
448
449#ifdef CONFIG_XIP_KERNEL
450#define trampoline_pud ((pud_t *)XIP_FIXUP(trampoline_pud))
451#define fixmap_pud ((pud_t *)XIP_FIXUP(fixmap_pud))
452#define early_pud ((pud_t *)XIP_FIXUP(early_pud))
453#endif /* CONFIG_XIP_KERNEL */
454
455static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
456{
457 /* Before MMU is enabled */
458 return (pmd_t *)((uintptr_t)pa);
459}
460
461static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
462{
463 clear_fixmap(FIX_PMD);
464 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
465}
466
467static pmd_t *__meminit get_pmd_virt_late(phys_addr_t pa)
468{
469 return (pmd_t *) __va(pa);
470}
471
472static phys_addr_t __init alloc_pmd_early(uintptr_t va)
473{
474 BUG_ON((va - kernel_map.virt_addr) >> PUD_SHIFT);
475
476 return (uintptr_t)early_pmd;
477}
478
479static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
480{
481 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
482}
483
484static phys_addr_t __meminit alloc_pmd_late(uintptr_t va)
485{
486 struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0);
487
488 BUG_ON(!ptdesc || !pagetable_pmd_ctor(ptdesc));
489 return __pa((pmd_t *)ptdesc_address(ptdesc));
490}
491
492static void __meminit create_pmd_mapping(pmd_t *pmdp,
493 uintptr_t va, phys_addr_t pa,
494 phys_addr_t sz, pgprot_t prot)
495{
496 pte_t *ptep;
497 phys_addr_t pte_phys;
498 uintptr_t pmd_idx = pmd_index(va);
499
500 if (sz == PMD_SIZE) {
501 if (pmd_none(pmdp[pmd_idx]))
502 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
503 return;
504 }
505
506 if (pmd_none(pmdp[pmd_idx])) {
507 pte_phys = pt_ops.alloc_pte(va);
508 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
509 ptep = pt_ops.get_pte_virt(pte_phys);
510 memset(ptep, 0, PAGE_SIZE);
511 } else {
512 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
513 ptep = pt_ops.get_pte_virt(pte_phys);
514 }
515
516 create_pte_mapping(ptep, va, pa, sz, prot);
517}
518
519static pud_t *__init get_pud_virt_early(phys_addr_t pa)
520{
521 return (pud_t *)((uintptr_t)pa);
522}
523
524static pud_t *__init get_pud_virt_fixmap(phys_addr_t pa)
525{
526 clear_fixmap(FIX_PUD);
527 return (pud_t *)set_fixmap_offset(FIX_PUD, pa);
528}
529
530static pud_t *__meminit get_pud_virt_late(phys_addr_t pa)
531{
532 return (pud_t *)__va(pa);
533}
534
535static phys_addr_t __init alloc_pud_early(uintptr_t va)
536{
537 /* Only one PUD is available for early mapping */
538 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT);
539
540 return (uintptr_t)early_pud;
541}
542
543static phys_addr_t __init alloc_pud_fixmap(uintptr_t va)
544{
545 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
546}
547
548static phys_addr_t __meminit alloc_pud_late(uintptr_t va)
549{
550 unsigned long vaddr;
551
552 vaddr = __get_free_page(GFP_KERNEL);
553 BUG_ON(!vaddr);
554 return __pa(vaddr);
555}
556
557static p4d_t *__init get_p4d_virt_early(phys_addr_t pa)
558{
559 return (p4d_t *)((uintptr_t)pa);
560}
561
562static p4d_t *__init get_p4d_virt_fixmap(phys_addr_t pa)
563{
564 clear_fixmap(FIX_P4D);
565 return (p4d_t *)set_fixmap_offset(FIX_P4D, pa);
566}
567
568static p4d_t *__meminit get_p4d_virt_late(phys_addr_t pa)
569{
570 return (p4d_t *)__va(pa);
571}
572
573static phys_addr_t __init alloc_p4d_early(uintptr_t va)
574{
575 /* Only one P4D is available for early mapping */
576 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT);
577
578 return (uintptr_t)early_p4d;
579}
580
581static phys_addr_t __init alloc_p4d_fixmap(uintptr_t va)
582{
583 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
584}
585
586static phys_addr_t __meminit alloc_p4d_late(uintptr_t va)
587{
588 unsigned long vaddr;
589
590 vaddr = __get_free_page(GFP_KERNEL);
591 BUG_ON(!vaddr);
592 return __pa(vaddr);
593}
594
595static void __meminit create_pud_mapping(pud_t *pudp, uintptr_t va, phys_addr_t pa, phys_addr_t sz,
596 pgprot_t prot)
597{
598 pmd_t *nextp;
599 phys_addr_t next_phys;
600 uintptr_t pud_index = pud_index(va);
601
602 if (sz == PUD_SIZE) {
603 if (pud_val(pudp[pud_index]) == 0)
604 pudp[pud_index] = pfn_pud(PFN_DOWN(pa), prot);
605 return;
606 }
607
608 if (pud_val(pudp[pud_index]) == 0) {
609 next_phys = pt_ops.alloc_pmd(va);
610 pudp[pud_index] = pfn_pud(PFN_DOWN(next_phys), PAGE_TABLE);
611 nextp = pt_ops.get_pmd_virt(next_phys);
612 memset(nextp, 0, PAGE_SIZE);
613 } else {
614 next_phys = PFN_PHYS(_pud_pfn(pudp[pud_index]));
615 nextp = pt_ops.get_pmd_virt(next_phys);
616 }
617
618 create_pmd_mapping(nextp, va, pa, sz, prot);
619}
620
621static void __meminit create_p4d_mapping(p4d_t *p4dp, uintptr_t va, phys_addr_t pa, phys_addr_t sz,
622 pgprot_t prot)
623{
624 pud_t *nextp;
625 phys_addr_t next_phys;
626 uintptr_t p4d_index = p4d_index(va);
627
628 if (sz == P4D_SIZE) {
629 if (p4d_val(p4dp[p4d_index]) == 0)
630 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(pa), prot);
631 return;
632 }
633
634 if (p4d_val(p4dp[p4d_index]) == 0) {
635 next_phys = pt_ops.alloc_pud(va);
636 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(next_phys), PAGE_TABLE);
637 nextp = pt_ops.get_pud_virt(next_phys);
638 memset(nextp, 0, PAGE_SIZE);
639 } else {
640 next_phys = PFN_PHYS(_p4d_pfn(p4dp[p4d_index]));
641 nextp = pt_ops.get_pud_virt(next_phys);
642 }
643
644 create_pud_mapping(nextp, va, pa, sz, prot);
645}
646
647#define pgd_next_t p4d_t
648#define alloc_pgd_next(__va) (pgtable_l5_enabled ? \
649 pt_ops.alloc_p4d(__va) : (pgtable_l4_enabled ? \
650 pt_ops.alloc_pud(__va) : pt_ops.alloc_pmd(__va)))
651#define get_pgd_next_virt(__pa) (pgtable_l5_enabled ? \
652 pt_ops.get_p4d_virt(__pa) : (pgd_next_t *)(pgtable_l4_enabled ? \
653 pt_ops.get_pud_virt(__pa) : (pud_t *)pt_ops.get_pmd_virt(__pa)))
654#define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
655 (pgtable_l5_enabled ? \
656 create_p4d_mapping(__nextp, __va, __pa, __sz, __prot) : \
657 (pgtable_l4_enabled ? \
658 create_pud_mapping((pud_t *)__nextp, __va, __pa, __sz, __prot) : \
659 create_pmd_mapping((pmd_t *)__nextp, __va, __pa, __sz, __prot)))
660#define fixmap_pgd_next (pgtable_l5_enabled ? \
661 (uintptr_t)fixmap_p4d : (pgtable_l4_enabled ? \
662 (uintptr_t)fixmap_pud : (uintptr_t)fixmap_pmd))
663#define trampoline_pgd_next (pgtable_l5_enabled ? \
664 (uintptr_t)trampoline_p4d : (pgtable_l4_enabled ? \
665 (uintptr_t)trampoline_pud : (uintptr_t)trampoline_pmd))
666#else
667#define pgd_next_t pte_t
668#define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
669#define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
670#define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
671 create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
672#define fixmap_pgd_next ((uintptr_t)fixmap_pte)
673#define create_p4d_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
674#define create_pud_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
675#define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
676#endif /* __PAGETABLE_PMD_FOLDED */
677
678void __meminit create_pgd_mapping(pgd_t *pgdp, uintptr_t va, phys_addr_t pa, phys_addr_t sz,
679 pgprot_t prot)
680{
681 pgd_next_t *nextp;
682 phys_addr_t next_phys;
683 uintptr_t pgd_idx = pgd_index(va);
684
685 if (sz == PGDIR_SIZE) {
686 if (pgd_val(pgdp[pgd_idx]) == 0)
687 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
688 return;
689 }
690
691 if (pgd_val(pgdp[pgd_idx]) == 0) {
692 next_phys = alloc_pgd_next(va);
693 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
694 nextp = get_pgd_next_virt(next_phys);
695 memset(nextp, 0, PAGE_SIZE);
696 } else {
697 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
698 nextp = get_pgd_next_virt(next_phys);
699 }
700
701 create_pgd_next_mapping(nextp, va, pa, sz, prot);
702}
703
704static uintptr_t __meminit best_map_size(phys_addr_t pa, uintptr_t va, phys_addr_t size)
705{
706 if (debug_pagealloc_enabled())
707 return PAGE_SIZE;
708
709 if (pgtable_l5_enabled &&
710 !(pa & (P4D_SIZE - 1)) && !(va & (P4D_SIZE - 1)) && size >= P4D_SIZE)
711 return P4D_SIZE;
712
713 if (pgtable_l4_enabled &&
714 !(pa & (PUD_SIZE - 1)) && !(va & (PUD_SIZE - 1)) && size >= PUD_SIZE)
715 return PUD_SIZE;
716
717 if (IS_ENABLED(CONFIG_64BIT) &&
718 !(pa & (PMD_SIZE - 1)) && !(va & (PMD_SIZE - 1)) && size >= PMD_SIZE)
719 return PMD_SIZE;
720
721 return PAGE_SIZE;
722}
723
724#ifdef CONFIG_XIP_KERNEL
725#define phys_ram_base (*(phys_addr_t *)XIP_FIXUP(&phys_ram_base))
726extern char _xiprom[], _exiprom[], __data_loc;
727
728/* called from head.S with MMU off */
729asmlinkage void __init __copy_data(void)
730{
731 void *from = (void *)(&__data_loc);
732 void *to = (void *)CONFIG_PHYS_RAM_BASE;
733 size_t sz = (size_t)((uintptr_t)(&_end) - (uintptr_t)(&_sdata));
734
735 memcpy(to, from, sz);
736}
737#endif
738
739#ifdef CONFIG_STRICT_KERNEL_RWX
740static __meminit pgprot_t pgprot_from_va(uintptr_t va)
741{
742 if (is_va_kernel_text(va))
743 return PAGE_KERNEL_READ_EXEC;
744
745 /*
746 * In 64-bit kernel, the kernel mapping is outside the linear mapping so
747 * we must protect its linear mapping alias from being executed and
748 * written.
749 * And rodata section is marked readonly in mark_rodata_ro.
750 */
751 if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va))
752 return PAGE_KERNEL_READ;
753
754 return PAGE_KERNEL;
755}
756
757void mark_rodata_ro(void)
758{
759 set_kernel_memory(__start_rodata, _data, set_memory_ro);
760 if (IS_ENABLED(CONFIG_64BIT))
761 set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data),
762 set_memory_ro);
763}
764#else
765static __meminit pgprot_t pgprot_from_va(uintptr_t va)
766{
767 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va))
768 return PAGE_KERNEL;
769
770 return PAGE_KERNEL_EXEC;
771}
772#endif /* CONFIG_STRICT_KERNEL_RWX */
773
774#if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL)
775u64 __pi_set_satp_mode_from_cmdline(uintptr_t dtb_pa);
776
777static void __init disable_pgtable_l5(void)
778{
779 pgtable_l5_enabled = false;
780 kernel_map.page_offset = PAGE_OFFSET_L4;
781 satp_mode = SATP_MODE_48;
782}
783
784static void __init disable_pgtable_l4(void)
785{
786 pgtable_l4_enabled = false;
787 kernel_map.page_offset = PAGE_OFFSET_L3;
788 satp_mode = SATP_MODE_39;
789}
790
791static int __init print_no4lvl(char *p)
792{
793 pr_info("Disabled 4-level and 5-level paging");
794 return 0;
795}
796early_param("no4lvl", print_no4lvl);
797
798static int __init print_no5lvl(char *p)
799{
800 pr_info("Disabled 5-level paging");
801 return 0;
802}
803early_param("no5lvl", print_no5lvl);
804
805static void __init set_mmap_rnd_bits_max(void)
806{
807 mmap_rnd_bits_max = MMAP_VA_BITS - PAGE_SHIFT - 3;
808}
809
810/*
811 * There is a simple way to determine if 4-level is supported by the
812 * underlying hardware: establish 1:1 mapping in 4-level page table mode
813 * then read SATP to see if the configuration was taken into account
814 * meaning sv48 is supported.
815 */
816static __init void set_satp_mode(uintptr_t dtb_pa)
817{
818 u64 identity_satp, hw_satp;
819 uintptr_t set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK;
820 u64 satp_mode_cmdline = __pi_set_satp_mode_from_cmdline(dtb_pa);
821
822 if (satp_mode_cmdline == SATP_MODE_57) {
823 disable_pgtable_l5();
824 } else if (satp_mode_cmdline == SATP_MODE_48) {
825 disable_pgtable_l5();
826 disable_pgtable_l4();
827 return;
828 }
829
830 create_p4d_mapping(early_p4d,
831 set_satp_mode_pmd, (uintptr_t)early_pud,
832 P4D_SIZE, PAGE_TABLE);
833 create_pud_mapping(early_pud,
834 set_satp_mode_pmd, (uintptr_t)early_pmd,
835 PUD_SIZE, PAGE_TABLE);
836 /* Handle the case where set_satp_mode straddles 2 PMDs */
837 create_pmd_mapping(early_pmd,
838 set_satp_mode_pmd, set_satp_mode_pmd,
839 PMD_SIZE, PAGE_KERNEL_EXEC);
840 create_pmd_mapping(early_pmd,
841 set_satp_mode_pmd + PMD_SIZE,
842 set_satp_mode_pmd + PMD_SIZE,
843 PMD_SIZE, PAGE_KERNEL_EXEC);
844retry:
845 create_pgd_mapping(early_pg_dir,
846 set_satp_mode_pmd,
847 pgtable_l5_enabled ?
848 (uintptr_t)early_p4d : (uintptr_t)early_pud,
849 PGDIR_SIZE, PAGE_TABLE);
850
851 identity_satp = PFN_DOWN((uintptr_t)&early_pg_dir) | satp_mode;
852
853 local_flush_tlb_all();
854 csr_write(CSR_SATP, identity_satp);
855 hw_satp = csr_swap(CSR_SATP, 0ULL);
856 local_flush_tlb_all();
857
858 if (hw_satp != identity_satp) {
859 if (pgtable_l5_enabled) {
860 disable_pgtable_l5();
861 memset(early_pg_dir, 0, PAGE_SIZE);
862 goto retry;
863 }
864 disable_pgtable_l4();
865 }
866
867 memset(early_pg_dir, 0, PAGE_SIZE);
868 memset(early_p4d, 0, PAGE_SIZE);
869 memset(early_pud, 0, PAGE_SIZE);
870 memset(early_pmd, 0, PAGE_SIZE);
871}
872#endif
873
874/*
875 * setup_vm() is called from head.S with MMU-off.
876 *
877 * Following requirements should be honoured for setup_vm() to work
878 * correctly:
879 * 1) It should use PC-relative addressing for accessing kernel symbols.
880 * To achieve this we always use GCC cmodel=medany.
881 * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
882 * so disable compiler instrumentation when FTRACE is enabled.
883 *
884 * Currently, the above requirements are honoured by using custom CFLAGS
885 * for init.o in mm/Makefile.
886 */
887
888#ifndef __riscv_cmodel_medany
889#error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
890#endif
891
892#ifdef CONFIG_RELOCATABLE
893extern unsigned long __rela_dyn_start, __rela_dyn_end;
894
895static void __init relocate_kernel(void)
896{
897 Elf64_Rela *rela = (Elf64_Rela *)&__rela_dyn_start;
898 /*
899 * This holds the offset between the linked virtual address and the
900 * relocated virtual address.
901 */
902 uintptr_t reloc_offset = kernel_map.virt_addr - KERNEL_LINK_ADDR;
903 /*
904 * This holds the offset between kernel linked virtual address and
905 * physical address.
906 */
907 uintptr_t va_kernel_link_pa_offset = KERNEL_LINK_ADDR - kernel_map.phys_addr;
908
909 for ( ; rela < (Elf64_Rela *)&__rela_dyn_end; rela++) {
910 Elf64_Addr addr = (rela->r_offset - va_kernel_link_pa_offset);
911 Elf64_Addr relocated_addr = rela->r_addend;
912
913 if (rela->r_info != R_RISCV_RELATIVE)
914 continue;
915
916 /*
917 * Make sure to not relocate vdso symbols like rt_sigreturn
918 * which are linked from the address 0 in vmlinux since
919 * vdso symbol addresses are actually used as an offset from
920 * mm->context.vdso in VDSO_OFFSET macro.
921 */
922 if (relocated_addr >= KERNEL_LINK_ADDR)
923 relocated_addr += reloc_offset;
924
925 *(Elf64_Addr *)addr = relocated_addr;
926 }
927}
928#endif /* CONFIG_RELOCATABLE */
929
930#ifdef CONFIG_XIP_KERNEL
931static void __init create_kernel_page_table(pgd_t *pgdir,
932 __always_unused bool early)
933{
934 uintptr_t va, start_va, end_va;
935
936 /* Map the flash resident part */
937 end_va = kernel_map.virt_addr + kernel_map.xiprom_sz;
938 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE)
939 create_pgd_mapping(pgdir, va,
940 kernel_map.xiprom + (va - kernel_map.virt_addr),
941 PMD_SIZE, PAGE_KERNEL_EXEC);
942
943 /* Map the data in RAM */
944 start_va = kernel_map.virt_addr + (uintptr_t)&_sdata - (uintptr_t)&_start;
945 end_va = kernel_map.virt_addr + kernel_map.size;
946 for (va = start_va; va < end_va; va += PMD_SIZE)
947 create_pgd_mapping(pgdir, va,
948 kernel_map.phys_addr + (va - start_va),
949 PMD_SIZE, PAGE_KERNEL);
950}
951#else
952static void __init create_kernel_page_table(pgd_t *pgdir, bool early)
953{
954 uintptr_t va, end_va;
955
956 end_va = kernel_map.virt_addr + kernel_map.size;
957 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE)
958 create_pgd_mapping(pgdir, va,
959 kernel_map.phys_addr + (va - kernel_map.virt_addr),
960 PMD_SIZE,
961 early ?
962 PAGE_KERNEL_EXEC : pgprot_from_va(va));
963}
964#endif
965
966/*
967 * Setup a 4MB mapping that encompasses the device tree: for 64-bit kernel,
968 * this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR
969 * entry.
970 */
971static void __init create_fdt_early_page_table(uintptr_t fix_fdt_va,
972 uintptr_t dtb_pa)
973{
974#ifndef CONFIG_BUILTIN_DTB
975 uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1);
976
977 /* Make sure the fdt fixmap address is always aligned on PMD size */
978 BUILD_BUG_ON(FIX_FDT % (PMD_SIZE / PAGE_SIZE));
979
980 /* In 32-bit only, the fdt lies in its own PGD */
981 if (!IS_ENABLED(CONFIG_64BIT)) {
982 create_pgd_mapping(early_pg_dir, fix_fdt_va,
983 pa, MAX_FDT_SIZE, PAGE_KERNEL);
984 } else {
985 create_pmd_mapping(fixmap_pmd, fix_fdt_va,
986 pa, PMD_SIZE, PAGE_KERNEL);
987 create_pmd_mapping(fixmap_pmd, fix_fdt_va + PMD_SIZE,
988 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
989 }
990
991 dtb_early_va = (void *)fix_fdt_va + (dtb_pa & (PMD_SIZE - 1));
992#else
993 /*
994 * For 64-bit kernel, __va can't be used since it would return a linear
995 * mapping address whereas dtb_early_va will be used before
996 * setup_vm_final installs the linear mapping. For 32-bit kernel, as the
997 * kernel is mapped in the linear mapping, that makes no difference.
998 */
999 dtb_early_va = kernel_mapping_pa_to_va(dtb_pa);
1000#endif
1001
1002 dtb_early_pa = dtb_pa;
1003}
1004
1005/*
1006 * MMU is not enabled, the page tables are allocated directly using
1007 * early_pmd/pud/p4d and the address returned is the physical one.
1008 */
1009static void __init pt_ops_set_early(void)
1010{
1011 pt_ops.alloc_pte = alloc_pte_early;
1012 pt_ops.get_pte_virt = get_pte_virt_early;
1013#ifndef __PAGETABLE_PMD_FOLDED
1014 pt_ops.alloc_pmd = alloc_pmd_early;
1015 pt_ops.get_pmd_virt = get_pmd_virt_early;
1016 pt_ops.alloc_pud = alloc_pud_early;
1017 pt_ops.get_pud_virt = get_pud_virt_early;
1018 pt_ops.alloc_p4d = alloc_p4d_early;
1019 pt_ops.get_p4d_virt = get_p4d_virt_early;
1020#endif
1021}
1022
1023/*
1024 * MMU is enabled but page table setup is not complete yet.
1025 * fixmap page table alloc functions must be used as a means to temporarily
1026 * map the allocated physical pages since the linear mapping does not exist yet.
1027 *
1028 * Note that this is called with MMU disabled, hence kernel_mapping_pa_to_va,
1029 * but it will be used as described above.
1030 */
1031static void __init pt_ops_set_fixmap(void)
1032{
1033 pt_ops.alloc_pte = kernel_mapping_pa_to_va(alloc_pte_fixmap);
1034 pt_ops.get_pte_virt = kernel_mapping_pa_to_va(get_pte_virt_fixmap);
1035#ifndef __PAGETABLE_PMD_FOLDED
1036 pt_ops.alloc_pmd = kernel_mapping_pa_to_va(alloc_pmd_fixmap);
1037 pt_ops.get_pmd_virt = kernel_mapping_pa_to_va(get_pmd_virt_fixmap);
1038 pt_ops.alloc_pud = kernel_mapping_pa_to_va(alloc_pud_fixmap);
1039 pt_ops.get_pud_virt = kernel_mapping_pa_to_va(get_pud_virt_fixmap);
1040 pt_ops.alloc_p4d = kernel_mapping_pa_to_va(alloc_p4d_fixmap);
1041 pt_ops.get_p4d_virt = kernel_mapping_pa_to_va(get_p4d_virt_fixmap);
1042#endif
1043}
1044
1045/*
1046 * MMU is enabled and page table setup is complete, so from now, we can use
1047 * generic page allocation functions to setup page table.
1048 */
1049static void __init pt_ops_set_late(void)
1050{
1051 pt_ops.alloc_pte = alloc_pte_late;
1052 pt_ops.get_pte_virt = get_pte_virt_late;
1053#ifndef __PAGETABLE_PMD_FOLDED
1054 pt_ops.alloc_pmd = alloc_pmd_late;
1055 pt_ops.get_pmd_virt = get_pmd_virt_late;
1056 pt_ops.alloc_pud = alloc_pud_late;
1057 pt_ops.get_pud_virt = get_pud_virt_late;
1058 pt_ops.alloc_p4d = alloc_p4d_late;
1059 pt_ops.get_p4d_virt = get_p4d_virt_late;
1060#endif
1061}
1062
1063#ifdef CONFIG_RANDOMIZE_BASE
1064extern bool __init __pi_set_nokaslr_from_cmdline(uintptr_t dtb_pa);
1065extern u64 __init __pi_get_kaslr_seed(uintptr_t dtb_pa);
1066extern u64 __init __pi_get_kaslr_seed_zkr(const uintptr_t dtb_pa);
1067
1068static int __init print_nokaslr(char *p)
1069{
1070 pr_info("Disabled KASLR");
1071 return 0;
1072}
1073early_param("nokaslr", print_nokaslr);
1074
1075unsigned long kaslr_offset(void)
1076{
1077 return kernel_map.virt_offset;
1078}
1079#endif
1080
1081asmlinkage void __init setup_vm(uintptr_t dtb_pa)
1082{
1083 pmd_t __maybe_unused fix_bmap_spmd, fix_bmap_epmd;
1084
1085#ifdef CONFIG_RANDOMIZE_BASE
1086 if (!__pi_set_nokaslr_from_cmdline(dtb_pa)) {
1087 u64 kaslr_seed = __pi_get_kaslr_seed_zkr(dtb_pa);
1088 u32 kernel_size = (uintptr_t)(&_end) - (uintptr_t)(&_start);
1089 u32 nr_pos;
1090
1091 if (kaslr_seed == 0)
1092 kaslr_seed = __pi_get_kaslr_seed(dtb_pa);
1093 /*
1094 * Compute the number of positions available: we are limited
1095 * by the early page table that only has one PUD and we must
1096 * be aligned on PMD_SIZE.
1097 */
1098 nr_pos = (PUD_SIZE - kernel_size) / PMD_SIZE;
1099
1100 kernel_map.virt_offset = (kaslr_seed % nr_pos) * PMD_SIZE;
1101 }
1102#endif
1103
1104 kernel_map.virt_addr = KERNEL_LINK_ADDR + kernel_map.virt_offset;
1105
1106#ifdef CONFIG_XIP_KERNEL
1107#ifdef CONFIG_64BIT
1108 kernel_map.page_offset = PAGE_OFFSET_L3;
1109#else
1110 kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL);
1111#endif
1112 kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR;
1113 kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom);
1114
1115 phys_ram_base = CONFIG_PHYS_RAM_BASE;
1116#ifdef CONFIG_SPARSEMEM_VMEMMAP
1117 vmemmap_start_pfn = round_down(phys_ram_base, VMEMMAP_ADDR_ALIGN) >> PAGE_SHIFT;
1118#endif
1119 kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE;
1120 kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_start);
1121
1122 kernel_map.va_kernel_xip_text_pa_offset = kernel_map.virt_addr - kernel_map.xiprom;
1123 kernel_map.va_kernel_xip_data_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr
1124 + (uintptr_t)&_sdata - (uintptr_t)&_start;
1125#else
1126 kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL);
1127 kernel_map.phys_addr = (uintptr_t)(&_start);
1128 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr;
1129 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
1130#endif
1131
1132#if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL)
1133 set_satp_mode(dtb_pa);
1134 set_mmap_rnd_bits_max();
1135#endif
1136
1137 /*
1138 * In 64-bit, we defer the setup of va_pa_offset to setup_bootmem,
1139 * where we have the system memory layout: this allows us to align
1140 * the physical and virtual mappings and then make use of PUD/P4D/PGD
1141 * for the linear mapping. This is only possible because the kernel
1142 * mapping lies outside the linear mapping.
1143 * In 32-bit however, as the kernel resides in the linear mapping,
1144 * setup_vm_final can not change the mapping established here,
1145 * otherwise the same kernel addresses would get mapped to different
1146 * physical addresses (if the start of dram is different from the
1147 * kernel physical address start).
1148 */
1149 kernel_map.va_pa_offset = IS_ENABLED(CONFIG_64BIT) ?
1150 0UL : PAGE_OFFSET - kernel_map.phys_addr;
1151
1152 memory_limit = KERN_VIRT_SIZE;
1153
1154 /* Sanity check alignment and size */
1155 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
1156 BUG_ON((kernel_map.phys_addr % PMD_SIZE) != 0);
1157
1158#ifdef CONFIG_64BIT
1159 /*
1160 * The last 4K bytes of the addressable memory can not be mapped because
1161 * of IS_ERR_VALUE macro.
1162 */
1163 BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K);
1164#endif
1165
1166#ifdef CONFIG_RELOCATABLE
1167 /*
1168 * Early page table uses only one PUD, which makes it possible
1169 * to map PUD_SIZE aligned on PUD_SIZE: if the relocation offset
1170 * makes the kernel cross over a PUD_SIZE boundary, raise a bug
1171 * since a part of the kernel would not get mapped.
1172 */
1173 BUG_ON(PUD_SIZE - (kernel_map.virt_addr & (PUD_SIZE - 1)) < kernel_map.size);
1174 relocate_kernel();
1175#endif
1176
1177 apply_early_boot_alternatives();
1178 pt_ops_set_early();
1179
1180 /* Setup early PGD for fixmap */
1181 create_pgd_mapping(early_pg_dir, FIXADDR_START,
1182 fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
1183
1184#ifndef __PAGETABLE_PMD_FOLDED
1185 /* Setup fixmap P4D and PUD */
1186 if (pgtable_l5_enabled)
1187 create_p4d_mapping(fixmap_p4d, FIXADDR_START,
1188 (uintptr_t)fixmap_pud, P4D_SIZE, PAGE_TABLE);
1189 /* Setup fixmap PUD and PMD */
1190 if (pgtable_l4_enabled)
1191 create_pud_mapping(fixmap_pud, FIXADDR_START,
1192 (uintptr_t)fixmap_pmd, PUD_SIZE, PAGE_TABLE);
1193 create_pmd_mapping(fixmap_pmd, FIXADDR_START,
1194 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
1195 /* Setup trampoline PGD and PMD */
1196 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
1197 trampoline_pgd_next, PGDIR_SIZE, PAGE_TABLE);
1198 if (pgtable_l5_enabled)
1199 create_p4d_mapping(trampoline_p4d, kernel_map.virt_addr,
1200 (uintptr_t)trampoline_pud, P4D_SIZE, PAGE_TABLE);
1201 if (pgtable_l4_enabled)
1202 create_pud_mapping(trampoline_pud, kernel_map.virt_addr,
1203 (uintptr_t)trampoline_pmd, PUD_SIZE, PAGE_TABLE);
1204#ifdef CONFIG_XIP_KERNEL
1205 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
1206 kernel_map.xiprom, PMD_SIZE, PAGE_KERNEL_EXEC);
1207#else
1208 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
1209 kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC);
1210#endif
1211#else
1212 /* Setup trampoline PGD */
1213 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
1214 kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC);
1215#endif
1216
1217 /*
1218 * Setup early PGD covering entire kernel which will allow
1219 * us to reach paging_init(). We map all memory banks later
1220 * in setup_vm_final() below.
1221 */
1222 create_kernel_page_table(early_pg_dir, true);
1223
1224 /* Setup early mapping for FDT early scan */
1225 create_fdt_early_page_table(__fix_to_virt(FIX_FDT), dtb_pa);
1226
1227 /*
1228 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
1229 * range can not span multiple pmds.
1230 */
1231 BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
1232 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
1233
1234#ifndef __PAGETABLE_PMD_FOLDED
1235 /*
1236 * Early ioremap fixmap is already created as it lies within first 2MB
1237 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
1238 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
1239 * the user if not.
1240 */
1241 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
1242 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
1243 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
1244 WARN_ON(1);
1245 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
1246 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
1247 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
1248 fix_to_virt(FIX_BTMAP_BEGIN));
1249 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
1250 fix_to_virt(FIX_BTMAP_END));
1251
1252 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
1253 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
1254 }
1255#endif
1256
1257 pt_ops_set_fixmap();
1258}
1259
1260static void __meminit create_linear_mapping_range(phys_addr_t start, phys_addr_t end,
1261 uintptr_t fixed_map_size, const pgprot_t *pgprot)
1262{
1263 phys_addr_t pa;
1264 uintptr_t va, map_size;
1265
1266 for (pa = start; pa < end; pa += map_size) {
1267 va = (uintptr_t)__va(pa);
1268 map_size = fixed_map_size ? fixed_map_size :
1269 best_map_size(pa, va, end - pa);
1270
1271 create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
1272 pgprot ? *pgprot : pgprot_from_va(va));
1273 }
1274}
1275
1276static void __init create_linear_mapping_page_table(void)
1277{
1278 phys_addr_t start, end;
1279 phys_addr_t kfence_pool __maybe_unused;
1280 u64 i;
1281
1282#ifdef CONFIG_STRICT_KERNEL_RWX
1283 phys_addr_t ktext_start = __pa_symbol(_start);
1284 phys_addr_t ktext_size = __init_data_begin - _start;
1285 phys_addr_t krodata_start = __pa_symbol(__start_rodata);
1286 phys_addr_t krodata_size = _data - __start_rodata;
1287
1288 /* Isolate kernel text and rodata so they don't get mapped with a PUD */
1289 memblock_mark_nomap(ktext_start, ktext_size);
1290 memblock_mark_nomap(krodata_start, krodata_size);
1291#endif
1292
1293#ifdef CONFIG_KFENCE
1294 /*
1295 * kfence pool must be backed by PAGE_SIZE mappings, so allocate it
1296 * before we setup the linear mapping so that we avoid using hugepages
1297 * for this region.
1298 */
1299 kfence_pool = memblock_phys_alloc(KFENCE_POOL_SIZE, PAGE_SIZE);
1300 BUG_ON(!kfence_pool);
1301
1302 memblock_mark_nomap(kfence_pool, KFENCE_POOL_SIZE);
1303 __kfence_pool = __va(kfence_pool);
1304#endif
1305
1306 /* Map all memory banks in the linear mapping */
1307 for_each_mem_range(i, &start, &end) {
1308 if (start >= end)
1309 break;
1310 if (start <= __pa(PAGE_OFFSET) &&
1311 __pa(PAGE_OFFSET) < end)
1312 start = __pa(PAGE_OFFSET);
1313
1314 create_linear_mapping_range(start, end, 0, NULL);
1315 }
1316
1317#ifdef CONFIG_STRICT_KERNEL_RWX
1318 create_linear_mapping_range(ktext_start, ktext_start + ktext_size, 0, NULL);
1319 create_linear_mapping_range(krodata_start, krodata_start + krodata_size, 0, NULL);
1320
1321 memblock_clear_nomap(ktext_start, ktext_size);
1322 memblock_clear_nomap(krodata_start, krodata_size);
1323#endif
1324
1325#ifdef CONFIG_KFENCE
1326 create_linear_mapping_range(kfence_pool, kfence_pool + KFENCE_POOL_SIZE, PAGE_SIZE, NULL);
1327
1328 memblock_clear_nomap(kfence_pool, KFENCE_POOL_SIZE);
1329#endif
1330}
1331
1332static void __init setup_vm_final(void)
1333{
1334 /* Setup swapper PGD for fixmap */
1335#if !defined(CONFIG_64BIT)
1336 /*
1337 * In 32-bit, the device tree lies in a pgd entry, so it must be copied
1338 * directly in swapper_pg_dir in addition to the pgd entry that points
1339 * to fixmap_pte.
1340 */
1341 unsigned long idx = pgd_index(__fix_to_virt(FIX_FDT));
1342
1343 set_pgd(&swapper_pg_dir[idx], early_pg_dir[idx]);
1344#endif
1345 create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
1346 __pa_symbol(fixmap_pgd_next),
1347 PGDIR_SIZE, PAGE_TABLE);
1348
1349 /* Map the linear mapping */
1350 create_linear_mapping_page_table();
1351
1352 /* Map the kernel */
1353 if (IS_ENABLED(CONFIG_64BIT))
1354 create_kernel_page_table(swapper_pg_dir, false);
1355
1356#ifdef CONFIG_KASAN
1357 kasan_swapper_init();
1358#endif
1359
1360 /* Clear fixmap PTE and PMD mappings */
1361 clear_fixmap(FIX_PTE);
1362 clear_fixmap(FIX_PMD);
1363 clear_fixmap(FIX_PUD);
1364 clear_fixmap(FIX_P4D);
1365
1366 /* Move to swapper page table */
1367 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | satp_mode);
1368 local_flush_tlb_all();
1369
1370 pt_ops_set_late();
1371}
1372#else
1373asmlinkage void __init setup_vm(uintptr_t dtb_pa)
1374{
1375 dtb_early_va = (void *)dtb_pa;
1376 dtb_early_pa = dtb_pa;
1377}
1378
1379static inline void setup_vm_final(void)
1380{
1381}
1382#endif /* CONFIG_MMU */
1383
1384/*
1385 * reserve_crashkernel() - reserves memory for crash kernel
1386 *
1387 * This function reserves memory area given in "crashkernel=" kernel command
1388 * line parameter. The memory reserved is used by dump capture kernel when
1389 * primary kernel is crashing.
1390 */
1391static void __init arch_reserve_crashkernel(void)
1392{
1393 unsigned long long low_size = 0;
1394 unsigned long long crash_base, crash_size;
1395 char *cmdline = boot_command_line;
1396 bool high = false;
1397 int ret;
1398
1399 if (!IS_ENABLED(CONFIG_CRASH_RESERVE))
1400 return;
1401
1402 ret = parse_crashkernel(cmdline, memblock_phys_mem_size(),
1403 &crash_size, &crash_base,
1404 &low_size, &high);
1405 if (ret)
1406 return;
1407
1408 reserve_crashkernel_generic(cmdline, crash_size, crash_base,
1409 low_size, high);
1410}
1411
1412void __init paging_init(void)
1413{
1414 setup_bootmem();
1415 setup_vm_final();
1416
1417 /* Depend on that Linear Mapping is ready */
1418 memblock_allow_resize();
1419}
1420
1421void __init misc_mem_init(void)
1422{
1423 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
1424 arch_numa_init();
1425 sparse_init();
1426#ifdef CONFIG_SPARSEMEM_VMEMMAP
1427 /* The entire VMEMMAP region has been populated. Flush TLB for this region */
1428 local_flush_tlb_kernel_range(VMEMMAP_START, VMEMMAP_END);
1429#endif
1430 zone_sizes_init();
1431 arch_reserve_crashkernel();
1432 memblock_dump_all();
1433}
1434
1435#ifdef CONFIG_SPARSEMEM_VMEMMAP
1436void __meminit vmemmap_set_pmd(pmd_t *pmd, void *p, int node,
1437 unsigned long addr, unsigned long next)
1438{
1439 pmd_set_huge(pmd, virt_to_phys(p), PAGE_KERNEL);
1440}
1441
1442int __meminit vmemmap_check_pmd(pmd_t *pmdp, int node,
1443 unsigned long addr, unsigned long next)
1444{
1445 vmemmap_verify((pte_t *)pmdp, node, addr, next);
1446 return 1;
1447}
1448
1449int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
1450 struct vmem_altmap *altmap)
1451{
1452 /*
1453 * Note that SPARSEMEM_VMEMMAP is only selected for rv64 and that we
1454 * can't use hugepage mappings for 2-level page table because in case of
1455 * memory hotplug, we are not able to update all the page tables with
1456 * the new PMDs.
1457 */
1458 return vmemmap_populate_hugepages(start, end, node, altmap);
1459}
1460#endif
1461
1462#if defined(CONFIG_MMU) && defined(CONFIG_64BIT)
1463/*
1464 * Pre-allocates page-table pages for a specific area in the kernel
1465 * page-table. Only the level which needs to be synchronized between
1466 * all page-tables is allocated because the synchronization can be
1467 * expensive.
1468 */
1469static void __init preallocate_pgd_pages_range(unsigned long start, unsigned long end,
1470 const char *area)
1471{
1472 unsigned long addr;
1473 const char *lvl;
1474
1475 for (addr = start; addr < end && addr >= start; addr = ALIGN(addr + 1, PGDIR_SIZE)) {
1476 pgd_t *pgd = pgd_offset_k(addr);
1477 p4d_t *p4d;
1478 pud_t *pud;
1479 pmd_t *pmd;
1480
1481 lvl = "p4d";
1482 p4d = p4d_alloc(&init_mm, pgd, addr);
1483 if (!p4d)
1484 goto failed;
1485
1486 if (pgtable_l5_enabled)
1487 continue;
1488
1489 lvl = "pud";
1490 pud = pud_alloc(&init_mm, p4d, addr);
1491 if (!pud)
1492 goto failed;
1493
1494 if (pgtable_l4_enabled)
1495 continue;
1496
1497 lvl = "pmd";
1498 pmd = pmd_alloc(&init_mm, pud, addr);
1499 if (!pmd)
1500 goto failed;
1501 }
1502 return;
1503
1504failed:
1505 /*
1506 * The pages have to be there now or they will be missing in
1507 * process page-tables later.
1508 */
1509 panic("Failed to pre-allocate %s pages for %s area\n", lvl, area);
1510}
1511
1512#define PAGE_END KASAN_SHADOW_START
1513
1514void __init pgtable_cache_init(void)
1515{
1516 preallocate_pgd_pages_range(VMALLOC_START, VMALLOC_END, "vmalloc");
1517 if (IS_ENABLED(CONFIG_MODULES))
1518 preallocate_pgd_pages_range(MODULES_VADDR, MODULES_END, "bpf/modules");
1519 if (IS_ENABLED(CONFIG_MEMORY_HOTPLUG)) {
1520 preallocate_pgd_pages_range(VMEMMAP_START, VMEMMAP_END, "vmemmap");
1521 preallocate_pgd_pages_range(PAGE_OFFSET, PAGE_END, "direct map");
1522 if (IS_ENABLED(CONFIG_KASAN))
1523 preallocate_pgd_pages_range(KASAN_SHADOW_START, KASAN_SHADOW_END, "kasan");
1524 }
1525}
1526#endif
1527
1528#ifdef CONFIG_EXECMEM
1529#ifdef CONFIG_MMU
1530static struct execmem_info execmem_info __ro_after_init;
1531
1532struct execmem_info __init *execmem_arch_setup(void)
1533{
1534 execmem_info = (struct execmem_info){
1535 .ranges = {
1536 [EXECMEM_DEFAULT] = {
1537 .start = MODULES_VADDR,
1538 .end = MODULES_END,
1539 .pgprot = PAGE_KERNEL,
1540 .alignment = 1,
1541 },
1542 [EXECMEM_KPROBES] = {
1543 .start = VMALLOC_START,
1544 .end = VMALLOC_END,
1545 .pgprot = PAGE_KERNEL_READ_EXEC,
1546 .alignment = 1,
1547 },
1548 [EXECMEM_BPF] = {
1549 .start = BPF_JIT_REGION_START,
1550 .end = BPF_JIT_REGION_END,
1551 .pgprot = PAGE_KERNEL,
1552 .alignment = PAGE_SIZE,
1553 },
1554 },
1555 };
1556
1557 return &execmem_info;
1558}
1559#endif /* CONFIG_MMU */
1560#endif /* CONFIG_EXECMEM */
1561
1562#ifdef CONFIG_MEMORY_HOTPLUG
1563static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd)
1564{
1565 struct page *page = pmd_page(*pmd);
1566 struct ptdesc *ptdesc = page_ptdesc(page);
1567 pte_t *pte;
1568 int i;
1569
1570 for (i = 0; i < PTRS_PER_PTE; i++) {
1571 pte = pte_start + i;
1572 if (!pte_none(*pte))
1573 return;
1574 }
1575
1576 pagetable_pte_dtor(ptdesc);
1577 if (PageReserved(page))
1578 free_reserved_page(page);
1579 else
1580 pagetable_free(ptdesc);
1581 pmd_clear(pmd);
1582}
1583
1584static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud, bool is_vmemmap)
1585{
1586 struct page *page = pud_page(*pud);
1587 struct ptdesc *ptdesc = page_ptdesc(page);
1588 pmd_t *pmd;
1589 int i;
1590
1591 for (i = 0; i < PTRS_PER_PMD; i++) {
1592 pmd = pmd_start + i;
1593 if (!pmd_none(*pmd))
1594 return;
1595 }
1596
1597 if (!is_vmemmap)
1598 pagetable_pmd_dtor(ptdesc);
1599 if (PageReserved(page))
1600 free_reserved_page(page);
1601 else
1602 pagetable_free(ptdesc);
1603 pud_clear(pud);
1604}
1605
1606static void __meminit free_pud_table(pud_t *pud_start, p4d_t *p4d)
1607{
1608 struct page *page = p4d_page(*p4d);
1609 pud_t *pud;
1610 int i;
1611
1612 for (i = 0; i < PTRS_PER_PUD; i++) {
1613 pud = pud_start + i;
1614 if (!pud_none(*pud))
1615 return;
1616 }
1617
1618 if (PageReserved(page))
1619 free_reserved_page(page);
1620 else
1621 free_pages((unsigned long)page_address(page), 0);
1622 p4d_clear(p4d);
1623}
1624
1625static void __meminit free_vmemmap_storage(struct page *page, size_t size,
1626 struct vmem_altmap *altmap)
1627{
1628 int order = get_order(size);
1629
1630 if (altmap) {
1631 vmem_altmap_free(altmap, size >> PAGE_SHIFT);
1632 return;
1633 }
1634
1635 if (PageReserved(page)) {
1636 unsigned int nr_pages = 1 << order;
1637
1638 while (nr_pages--)
1639 free_reserved_page(page++);
1640 return;
1641 }
1642
1643 free_pages((unsigned long)page_address(page), order);
1644}
1645
1646static void __meminit remove_pte_mapping(pte_t *pte_base, unsigned long addr, unsigned long end,
1647 bool is_vmemmap, struct vmem_altmap *altmap)
1648{
1649 unsigned long next;
1650 pte_t *ptep, pte;
1651
1652 for (; addr < end; addr = next) {
1653 next = (addr + PAGE_SIZE) & PAGE_MASK;
1654 if (next > end)
1655 next = end;
1656
1657 ptep = pte_base + pte_index(addr);
1658 pte = ptep_get(ptep);
1659 if (!pte_present(*ptep))
1660 continue;
1661
1662 pte_clear(&init_mm, addr, ptep);
1663 if (is_vmemmap)
1664 free_vmemmap_storage(pte_page(pte), PAGE_SIZE, altmap);
1665 }
1666}
1667
1668static void __meminit remove_pmd_mapping(pmd_t *pmd_base, unsigned long addr, unsigned long end,
1669 bool is_vmemmap, struct vmem_altmap *altmap)
1670{
1671 unsigned long next;
1672 pte_t *pte_base;
1673 pmd_t *pmdp, pmd;
1674
1675 for (; addr < end; addr = next) {
1676 next = pmd_addr_end(addr, end);
1677 pmdp = pmd_base + pmd_index(addr);
1678 pmd = pmdp_get(pmdp);
1679 if (!pmd_present(pmd))
1680 continue;
1681
1682 if (pmd_leaf(pmd)) {
1683 pmd_clear(pmdp);
1684 if (is_vmemmap)
1685 free_vmemmap_storage(pmd_page(pmd), PMD_SIZE, altmap);
1686 continue;
1687 }
1688
1689 pte_base = (pte_t *)pmd_page_vaddr(*pmdp);
1690 remove_pte_mapping(pte_base, addr, next, is_vmemmap, altmap);
1691 free_pte_table(pte_base, pmdp);
1692 }
1693}
1694
1695static void __meminit remove_pud_mapping(pud_t *pud_base, unsigned long addr, unsigned long end,
1696 bool is_vmemmap, struct vmem_altmap *altmap)
1697{
1698 unsigned long next;
1699 pud_t *pudp, pud;
1700 pmd_t *pmd_base;
1701
1702 for (; addr < end; addr = next) {
1703 next = pud_addr_end(addr, end);
1704 pudp = pud_base + pud_index(addr);
1705 pud = pudp_get(pudp);
1706 if (!pud_present(pud))
1707 continue;
1708
1709 if (pud_leaf(pud)) {
1710 if (pgtable_l4_enabled) {
1711 pud_clear(pudp);
1712 if (is_vmemmap)
1713 free_vmemmap_storage(pud_page(pud), PUD_SIZE, altmap);
1714 }
1715 continue;
1716 }
1717
1718 pmd_base = pmd_offset(pudp, 0);
1719 remove_pmd_mapping(pmd_base, addr, next, is_vmemmap, altmap);
1720
1721 if (pgtable_l4_enabled)
1722 free_pmd_table(pmd_base, pudp, is_vmemmap);
1723 }
1724}
1725
1726static void __meminit remove_p4d_mapping(p4d_t *p4d_base, unsigned long addr, unsigned long end,
1727 bool is_vmemmap, struct vmem_altmap *altmap)
1728{
1729 unsigned long next;
1730 p4d_t *p4dp, p4d;
1731 pud_t *pud_base;
1732
1733 for (; addr < end; addr = next) {
1734 next = p4d_addr_end(addr, end);
1735 p4dp = p4d_base + p4d_index(addr);
1736 p4d = p4dp_get(p4dp);
1737 if (!p4d_present(p4d))
1738 continue;
1739
1740 if (p4d_leaf(p4d)) {
1741 if (pgtable_l5_enabled) {
1742 p4d_clear(p4dp);
1743 if (is_vmemmap)
1744 free_vmemmap_storage(p4d_page(p4d), P4D_SIZE, altmap);
1745 }
1746 continue;
1747 }
1748
1749 pud_base = pud_offset(p4dp, 0);
1750 remove_pud_mapping(pud_base, addr, next, is_vmemmap, altmap);
1751
1752 if (pgtable_l5_enabled)
1753 free_pud_table(pud_base, p4dp);
1754 }
1755}
1756
1757static void __meminit remove_pgd_mapping(unsigned long va, unsigned long end, bool is_vmemmap,
1758 struct vmem_altmap *altmap)
1759{
1760 unsigned long addr, next;
1761 p4d_t *p4d_base;
1762 pgd_t *pgd;
1763
1764 for (addr = va; addr < end; addr = next) {
1765 next = pgd_addr_end(addr, end);
1766 pgd = pgd_offset_k(addr);
1767
1768 if (!pgd_present(*pgd))
1769 continue;
1770
1771 if (pgd_leaf(*pgd))
1772 continue;
1773
1774 p4d_base = p4d_offset(pgd, 0);
1775 remove_p4d_mapping(p4d_base, addr, next, is_vmemmap, altmap);
1776 }
1777
1778 flush_tlb_all();
1779}
1780
1781static void __meminit remove_linear_mapping(phys_addr_t start, u64 size)
1782{
1783 unsigned long va = (unsigned long)__va(start);
1784 unsigned long end = (unsigned long)__va(start + size);
1785
1786 remove_pgd_mapping(va, end, false, NULL);
1787}
1788
1789struct range arch_get_mappable_range(void)
1790{
1791 struct range mhp_range;
1792
1793 mhp_range.start = __pa(PAGE_OFFSET);
1794 mhp_range.end = __pa(PAGE_END - 1);
1795 return mhp_range;
1796}
1797
1798int __ref arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *params)
1799{
1800 int ret = 0;
1801
1802 create_linear_mapping_range(start, start + size, 0, ¶ms->pgprot);
1803 ret = __add_pages(nid, start >> PAGE_SHIFT, size >> PAGE_SHIFT, params);
1804 if (ret) {
1805 remove_linear_mapping(start, size);
1806 goto out;
1807 }
1808
1809 max_pfn = PFN_UP(start + size);
1810 max_low_pfn = max_pfn;
1811
1812 out:
1813 flush_tlb_all();
1814 return ret;
1815}
1816
1817void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
1818{
1819 __remove_pages(start >> PAGE_SHIFT, size >> PAGE_SHIFT, altmap);
1820 remove_linear_mapping(start, size);
1821 flush_tlb_all();
1822}
1823
1824void __ref vmemmap_free(unsigned long start, unsigned long end, struct vmem_altmap *altmap)
1825{
1826 remove_pgd_mapping(start, end, true, altmap);
1827}
1828#endif /* CONFIG_MEMORY_HOTPLUG */