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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 2000 Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
9 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
10 */
11#include <linux/bug.h>
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/signal.h>
15#include <linux/sched.h>
16#include <linux/smp.h>
17#include <linux/kernel.h>
18#include <linux/errno.h>
19#include <linux/string.h>
20#include <linux/types.h>
21#include <linux/pagemap.h>
22#include <linux/ptrace.h>
23#include <linux/mman.h>
24#include <linux/mm.h>
25#include <linux/bootmem.h>
26#include <linux/highmem.h>
27#include <linux/swap.h>
28#include <linux/proc_fs.h>
29#include <linux/pfn.h>
30#include <linux/hardirq.h>
31#include <linux/gfp.h>
32
33#include <asm/asm-offsets.h>
34#include <asm/bootinfo.h>
35#include <asm/cachectl.h>
36#include <asm/cpu.h>
37#include <asm/dma.h>
38#include <asm/kmap_types.h>
39#include <asm/mmu_context.h>
40#include <asm/sections.h>
41#include <asm/pgtable.h>
42#include <asm/pgalloc.h>
43#include <asm/tlb.h>
44#include <asm/fixmap.h>
45
46/* Atomicity and interruptability */
47#ifdef CONFIG_MIPS_MT_SMTC
48
49#include <asm/mipsmtregs.h>
50
51#define ENTER_CRITICAL(flags) \
52 { \
53 unsigned int mvpflags; \
54 local_irq_save(flags);\
55 mvpflags = dvpe()
56#define EXIT_CRITICAL(flags) \
57 evpe(mvpflags); \
58 local_irq_restore(flags); \
59 }
60#else
61
62#define ENTER_CRITICAL(flags) local_irq_save(flags)
63#define EXIT_CRITICAL(flags) local_irq_restore(flags)
64
65#endif /* CONFIG_MIPS_MT_SMTC */
66
67/*
68 * We have up to 8 empty zeroed pages so we can map one of the right colour
69 * when needed. This is necessary only on R4000 / R4400 SC and MC versions
70 * where we have to avoid VCED / VECI exceptions for good performance at
71 * any price. Since page is never written to after the initialization we
72 * don't have to care about aliases on other CPUs.
73 */
74unsigned long empty_zero_page, zero_page_mask;
75EXPORT_SYMBOL_GPL(empty_zero_page);
76
77/*
78 * Not static inline because used by IP27 special magic initialization code
79 */
80unsigned long setup_zero_pages(void)
81{
82 unsigned int order;
83 unsigned long size;
84 struct page *page;
85
86 if (cpu_has_vce)
87 order = 3;
88 else
89 order = 0;
90
91 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
92 if (!empty_zero_page)
93 panic("Oh boy, that early out of memory?");
94
95 page = virt_to_page((void *)empty_zero_page);
96 split_page(page, order);
97 while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) {
98 SetPageReserved(page);
99 page++;
100 }
101
102 size = PAGE_SIZE << order;
103 zero_page_mask = (size - 1) & PAGE_MASK;
104
105 return 1UL << order;
106}
107
108#ifdef CONFIG_MIPS_MT_SMTC
109static pte_t *kmap_coherent_pte;
110static void __init kmap_coherent_init(void)
111{
112 unsigned long vaddr;
113
114 /* cache the first coherent kmap pte */
115 vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
116 kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
117}
118#else
119static inline void kmap_coherent_init(void) {}
120#endif
121
122void *kmap_coherent(struct page *page, unsigned long addr)
123{
124 enum fixed_addresses idx;
125 unsigned long vaddr, flags, entrylo;
126 unsigned long old_ctx;
127 pte_t pte;
128 int tlbidx;
129
130 BUG_ON(Page_dcache_dirty(page));
131
132 inc_preempt_count();
133 idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
134#ifdef CONFIG_MIPS_MT_SMTC
135 idx += FIX_N_COLOURS * smp_processor_id() +
136 (in_interrupt() ? (FIX_N_COLOURS * NR_CPUS) : 0);
137#else
138 idx += in_interrupt() ? FIX_N_COLOURS : 0;
139#endif
140 vaddr = __fix_to_virt(FIX_CMAP_END - idx);
141 pte = mk_pte(page, PAGE_KERNEL);
142#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
143 entrylo = pte.pte_high;
144#else
145 entrylo = pte_to_entrylo(pte_val(pte));
146#endif
147
148 ENTER_CRITICAL(flags);
149 old_ctx = read_c0_entryhi();
150 write_c0_entryhi(vaddr & (PAGE_MASK << 1));
151 write_c0_entrylo0(entrylo);
152 write_c0_entrylo1(entrylo);
153#ifdef CONFIG_MIPS_MT_SMTC
154 set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
155 /* preload TLB instead of local_flush_tlb_one() */
156 mtc0_tlbw_hazard();
157 tlb_probe();
158 tlb_probe_hazard();
159 tlbidx = read_c0_index();
160 mtc0_tlbw_hazard();
161 if (tlbidx < 0)
162 tlb_write_random();
163 else
164 tlb_write_indexed();
165#else
166 tlbidx = read_c0_wired();
167 write_c0_wired(tlbidx + 1);
168 write_c0_index(tlbidx);
169 mtc0_tlbw_hazard();
170 tlb_write_indexed();
171#endif
172 tlbw_use_hazard();
173 write_c0_entryhi(old_ctx);
174 EXIT_CRITICAL(flags);
175
176 return (void*) vaddr;
177}
178
179#define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
180
181void kunmap_coherent(void)
182{
183#ifndef CONFIG_MIPS_MT_SMTC
184 unsigned int wired;
185 unsigned long flags, old_ctx;
186
187 ENTER_CRITICAL(flags);
188 old_ctx = read_c0_entryhi();
189 wired = read_c0_wired() - 1;
190 write_c0_wired(wired);
191 write_c0_index(wired);
192 write_c0_entryhi(UNIQUE_ENTRYHI(wired));
193 write_c0_entrylo0(0);
194 write_c0_entrylo1(0);
195 mtc0_tlbw_hazard();
196 tlb_write_indexed();
197 tlbw_use_hazard();
198 write_c0_entryhi(old_ctx);
199 EXIT_CRITICAL(flags);
200#endif
201 dec_preempt_count();
202 preempt_check_resched();
203}
204
205void copy_user_highpage(struct page *to, struct page *from,
206 unsigned long vaddr, struct vm_area_struct *vma)
207{
208 void *vfrom, *vto;
209
210 vto = kmap_atomic(to, KM_USER1);
211 if (cpu_has_dc_aliases &&
212 page_mapped(from) && !Page_dcache_dirty(from)) {
213 vfrom = kmap_coherent(from, vaddr);
214 copy_page(vto, vfrom);
215 kunmap_coherent();
216 } else {
217 vfrom = kmap_atomic(from, KM_USER0);
218 copy_page(vto, vfrom);
219 kunmap_atomic(vfrom, KM_USER0);
220 }
221 if ((!cpu_has_ic_fills_f_dc) ||
222 pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
223 flush_data_cache_page((unsigned long)vto);
224 kunmap_atomic(vto, KM_USER1);
225 /* Make sure this page is cleared on other CPU's too before using it */
226 smp_wmb();
227}
228
229void copy_to_user_page(struct vm_area_struct *vma,
230 struct page *page, unsigned long vaddr, void *dst, const void *src,
231 unsigned long len)
232{
233 if (cpu_has_dc_aliases &&
234 page_mapped(page) && !Page_dcache_dirty(page)) {
235 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
236 memcpy(vto, src, len);
237 kunmap_coherent();
238 } else {
239 memcpy(dst, src, len);
240 if (cpu_has_dc_aliases)
241 SetPageDcacheDirty(page);
242 }
243 if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
244 flush_cache_page(vma, vaddr, page_to_pfn(page));
245}
246
247void copy_from_user_page(struct vm_area_struct *vma,
248 struct page *page, unsigned long vaddr, void *dst, const void *src,
249 unsigned long len)
250{
251 if (cpu_has_dc_aliases &&
252 page_mapped(page) && !Page_dcache_dirty(page)) {
253 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
254 memcpy(dst, vfrom, len);
255 kunmap_coherent();
256 } else {
257 memcpy(dst, src, len);
258 if (cpu_has_dc_aliases)
259 SetPageDcacheDirty(page);
260 }
261}
262
263void __init fixrange_init(unsigned long start, unsigned long end,
264 pgd_t *pgd_base)
265{
266#if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
267 pgd_t *pgd;
268 pud_t *pud;
269 pmd_t *pmd;
270 pte_t *pte;
271 int i, j, k;
272 unsigned long vaddr;
273
274 vaddr = start;
275 i = __pgd_offset(vaddr);
276 j = __pud_offset(vaddr);
277 k = __pmd_offset(vaddr);
278 pgd = pgd_base + i;
279
280 for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
281 pud = (pud_t *)pgd;
282 for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
283 pmd = (pmd_t *)pud;
284 for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
285 if (pmd_none(*pmd)) {
286 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
287 set_pmd(pmd, __pmd((unsigned long)pte));
288 BUG_ON(pte != pte_offset_kernel(pmd, 0));
289 }
290 vaddr += PMD_SIZE;
291 }
292 k = 0;
293 }
294 j = 0;
295 }
296#endif
297}
298
299#ifndef CONFIG_NEED_MULTIPLE_NODES
300int page_is_ram(unsigned long pagenr)
301{
302 int i;
303
304 for (i = 0; i < boot_mem_map.nr_map; i++) {
305 unsigned long addr, end;
306
307 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
308 /* not usable memory */
309 continue;
310
311 addr = PFN_UP(boot_mem_map.map[i].addr);
312 end = PFN_DOWN(boot_mem_map.map[i].addr +
313 boot_mem_map.map[i].size);
314
315 if (pagenr >= addr && pagenr < end)
316 return 1;
317 }
318
319 return 0;
320}
321
322void __init paging_init(void)
323{
324 unsigned long max_zone_pfns[MAX_NR_ZONES];
325 unsigned long lastpfn __maybe_unused;
326
327 pagetable_init();
328
329#ifdef CONFIG_HIGHMEM
330 kmap_init();
331#endif
332 kmap_coherent_init();
333
334#ifdef CONFIG_ZONE_DMA
335 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
336#endif
337#ifdef CONFIG_ZONE_DMA32
338 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
339#endif
340 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
341 lastpfn = max_low_pfn;
342#ifdef CONFIG_HIGHMEM
343 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
344 lastpfn = highend_pfn;
345
346 if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
347 printk(KERN_WARNING "This processor doesn't support highmem."
348 " %ldk highmem ignored\n",
349 (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
350 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
351 lastpfn = max_low_pfn;
352 }
353#endif
354
355 free_area_init_nodes(max_zone_pfns);
356}
357
358#ifdef CONFIG_64BIT
359static struct kcore_list kcore_kseg0;
360#endif
361
362void __init mem_init(void)
363{
364 unsigned long codesize, reservedpages, datasize, initsize;
365 unsigned long tmp, ram;
366
367#ifdef CONFIG_HIGHMEM
368#ifdef CONFIG_DISCONTIGMEM
369#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
370#endif
371 max_mapnr = highend_pfn ? highend_pfn : max_low_pfn;
372#else
373 max_mapnr = max_low_pfn;
374#endif
375 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
376
377 totalram_pages += free_all_bootmem();
378 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
379
380 reservedpages = ram = 0;
381 for (tmp = 0; tmp < max_low_pfn; tmp++)
382 if (page_is_ram(tmp)) {
383 ram++;
384 if (PageReserved(pfn_to_page(tmp)))
385 reservedpages++;
386 }
387 num_physpages = ram;
388
389#ifdef CONFIG_HIGHMEM
390 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
391 struct page *page = pfn_to_page(tmp);
392
393 if (!page_is_ram(tmp)) {
394 SetPageReserved(page);
395 continue;
396 }
397 ClearPageReserved(page);
398 init_page_count(page);
399 __free_page(page);
400 totalhigh_pages++;
401 }
402 totalram_pages += totalhigh_pages;
403 num_physpages += totalhigh_pages;
404#endif
405
406 codesize = (unsigned long) &_etext - (unsigned long) &_text;
407 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
408 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
409
410#ifdef CONFIG_64BIT
411 if ((unsigned long) &_text > (unsigned long) CKSEG0)
412 /* The -4 is a hack so that user tools don't have to handle
413 the overflow. */
414 kclist_add(&kcore_kseg0, (void *) CKSEG0,
415 0x80000000 - 4, KCORE_TEXT);
416#endif
417
418 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
419 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
420 nr_free_pages() << (PAGE_SHIFT-10),
421 ram << (PAGE_SHIFT-10),
422 codesize >> 10,
423 reservedpages << (PAGE_SHIFT-10),
424 datasize >> 10,
425 initsize >> 10,
426 totalhigh_pages << (PAGE_SHIFT-10));
427}
428#endif /* !CONFIG_NEED_MULTIPLE_NODES */
429
430void free_init_pages(const char *what, unsigned long begin, unsigned long end)
431{
432 unsigned long pfn;
433
434 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
435 struct page *page = pfn_to_page(pfn);
436 void *addr = phys_to_virt(PFN_PHYS(pfn));
437
438 ClearPageReserved(page);
439 init_page_count(page);
440 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
441 __free_page(page);
442 totalram_pages++;
443 }
444 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
445}
446
447#ifdef CONFIG_BLK_DEV_INITRD
448void free_initrd_mem(unsigned long start, unsigned long end)
449{
450 free_init_pages("initrd memory",
451 virt_to_phys((void *)start),
452 virt_to_phys((void *)end));
453}
454#endif
455
456void __init_refok free_initmem(void)
457{
458 prom_free_prom_memory();
459 free_init_pages("unused kernel memory",
460 __pa_symbol(&__init_begin),
461 __pa_symbol(&__init_end));
462}
463
464#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
465unsigned long pgd_current[NR_CPUS];
466#endif
467/*
468 * On 64-bit we've got three-level pagetables with a slightly
469 * different layout ...
470 */
471#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
472
473/*
474 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
475 * are constants. So we use the variants from asm-offset.h until that gcc
476 * will officially be retired.
477 */
478pgd_t swapper_pg_dir[_PTRS_PER_PGD] __page_aligned(_PGD_ORDER);
479#ifndef __PAGETABLE_PMD_FOLDED
480pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned(PMD_ORDER);
481#endif
482pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 2000 Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
9 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
10 */
11#include <linux/bug.h>
12#include <linux/init.h>
13#include <linux/export.h>
14#include <linux/signal.h>
15#include <linux/sched.h>
16#include <linux/smp.h>
17#include <linux/kernel.h>
18#include <linux/errno.h>
19#include <linux/string.h>
20#include <linux/types.h>
21#include <linux/pagemap.h>
22#include <linux/ptrace.h>
23#include <linux/mman.h>
24#include <linux/mm.h>
25#include <linux/memblock.h>
26#include <linux/highmem.h>
27#include <linux/swap.h>
28#include <linux/proc_fs.h>
29#include <linux/pfn.h>
30#include <linux/hardirq.h>
31#include <linux/gfp.h>
32#include <linux/kcore.h>
33#include <linux/initrd.h>
34
35#include <asm/bootinfo.h>
36#include <asm/cachectl.h>
37#include <asm/cpu.h>
38#include <asm/dma.h>
39#include <asm/maar.h>
40#include <asm/mmu_context.h>
41#include <asm/mmzone.h>
42#include <asm/sections.h>
43#include <asm/pgalloc.h>
44#include <asm/tlb.h>
45#include <asm/fixmap.h>
46
47/*
48 * We have up to 8 empty zeroed pages so we can map one of the right colour
49 * when needed. This is necessary only on R4000 / R4400 SC and MC versions
50 * where we have to avoid VCED / VECI exceptions for good performance at
51 * any price. Since page is never written to after the initialization we
52 * don't have to care about aliases on other CPUs.
53 */
54unsigned long empty_zero_page, zero_page_mask;
55EXPORT_SYMBOL_GPL(empty_zero_page);
56EXPORT_SYMBOL(zero_page_mask);
57
58/*
59 * Not static inline because used by IP27 special magic initialization code
60 */
61void setup_zero_pages(void)
62{
63 unsigned int order, i;
64 struct page *page;
65
66 if (cpu_has_vce)
67 order = 3;
68 else
69 order = 0;
70
71 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
72 if (!empty_zero_page)
73 panic("Oh boy, that early out of memory?");
74
75 page = virt_to_page((void *)empty_zero_page);
76 split_page(page, order);
77 for (i = 0; i < (1 << order); i++, page++)
78 mark_page_reserved(page);
79
80 zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
81}
82
83static void *__kmap_pgprot(struct page *page, unsigned long addr, pgprot_t prot)
84{
85 enum fixed_addresses idx;
86 unsigned int old_mmid;
87 unsigned long vaddr, flags, entrylo;
88 unsigned long old_ctx;
89 pte_t pte;
90 int tlbidx;
91
92 BUG_ON(folio_test_dcache_dirty(page_folio(page)));
93
94 preempt_disable();
95 pagefault_disable();
96 idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
97 idx += in_interrupt() ? FIX_N_COLOURS : 0;
98 vaddr = __fix_to_virt(FIX_CMAP_END - idx);
99 pte = mk_pte(page, prot);
100#if defined(CONFIG_XPA)
101 entrylo = pte_to_entrylo(pte.pte_high);
102#elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
103 entrylo = pte.pte_high;
104#else
105 entrylo = pte_to_entrylo(pte_val(pte));
106#endif
107
108 local_irq_save(flags);
109 old_ctx = read_c0_entryhi();
110 write_c0_entryhi(vaddr & (PAGE_MASK << 1));
111 write_c0_entrylo0(entrylo);
112 write_c0_entrylo1(entrylo);
113 if (cpu_has_mmid) {
114 old_mmid = read_c0_memorymapid();
115 write_c0_memorymapid(MMID_KERNEL_WIRED);
116 }
117#ifdef CONFIG_XPA
118 if (cpu_has_xpa) {
119 entrylo = (pte.pte_low & _PFNX_MASK);
120 writex_c0_entrylo0(entrylo);
121 writex_c0_entrylo1(entrylo);
122 }
123#endif
124 tlbidx = num_wired_entries();
125 write_c0_wired(tlbidx + 1);
126 write_c0_index(tlbidx);
127 mtc0_tlbw_hazard();
128 tlb_write_indexed();
129 tlbw_use_hazard();
130 write_c0_entryhi(old_ctx);
131 if (cpu_has_mmid)
132 write_c0_memorymapid(old_mmid);
133 local_irq_restore(flags);
134
135 return (void*) vaddr;
136}
137
138void *kmap_coherent(struct page *page, unsigned long addr)
139{
140 return __kmap_pgprot(page, addr, PAGE_KERNEL);
141}
142
143void *kmap_noncoherent(struct page *page, unsigned long addr)
144{
145 return __kmap_pgprot(page, addr, PAGE_KERNEL_NC);
146}
147
148void kunmap_coherent(void)
149{
150 unsigned int wired;
151 unsigned long flags, old_ctx;
152
153 local_irq_save(flags);
154 old_ctx = read_c0_entryhi();
155 wired = num_wired_entries() - 1;
156 write_c0_wired(wired);
157 write_c0_index(wired);
158 write_c0_entryhi(UNIQUE_ENTRYHI(wired));
159 write_c0_entrylo0(0);
160 write_c0_entrylo1(0);
161 mtc0_tlbw_hazard();
162 tlb_write_indexed();
163 tlbw_use_hazard();
164 write_c0_entryhi(old_ctx);
165 local_irq_restore(flags);
166 pagefault_enable();
167 preempt_enable();
168}
169
170void copy_user_highpage(struct page *to, struct page *from,
171 unsigned long vaddr, struct vm_area_struct *vma)
172{
173 struct folio *src = page_folio(from);
174 void *vfrom, *vto;
175
176 vto = kmap_atomic(to);
177 if (cpu_has_dc_aliases &&
178 folio_mapped(src) && !folio_test_dcache_dirty(src)) {
179 vfrom = kmap_coherent(from, vaddr);
180 copy_page(vto, vfrom);
181 kunmap_coherent();
182 } else {
183 vfrom = kmap_atomic(from);
184 copy_page(vto, vfrom);
185 kunmap_atomic(vfrom);
186 }
187 if ((!cpu_has_ic_fills_f_dc) ||
188 pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
189 flush_data_cache_page((unsigned long)vto);
190 kunmap_atomic(vto);
191 /* Make sure this page is cleared on other CPU's too before using it */
192 smp_wmb();
193}
194
195void copy_to_user_page(struct vm_area_struct *vma,
196 struct page *page, unsigned long vaddr, void *dst, const void *src,
197 unsigned long len)
198{
199 struct folio *folio = page_folio(page);
200
201 if (cpu_has_dc_aliases &&
202 folio_mapped(folio) && !folio_test_dcache_dirty(folio)) {
203 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
204 memcpy(vto, src, len);
205 kunmap_coherent();
206 } else {
207 memcpy(dst, src, len);
208 if (cpu_has_dc_aliases)
209 folio_set_dcache_dirty(folio);
210 }
211 if (vma->vm_flags & VM_EXEC)
212 flush_cache_page(vma, vaddr, page_to_pfn(page));
213}
214
215void copy_from_user_page(struct vm_area_struct *vma,
216 struct page *page, unsigned long vaddr, void *dst, const void *src,
217 unsigned long len)
218{
219 struct folio *folio = page_folio(page);
220
221 if (cpu_has_dc_aliases &&
222 folio_mapped(folio) && !folio_test_dcache_dirty(folio)) {
223 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
224 memcpy(dst, vfrom, len);
225 kunmap_coherent();
226 } else {
227 memcpy(dst, src, len);
228 if (cpu_has_dc_aliases)
229 folio_set_dcache_dirty(folio);
230 }
231}
232EXPORT_SYMBOL_GPL(copy_from_user_page);
233
234void __init fixrange_init(unsigned long start, unsigned long end,
235 pgd_t *pgd_base)
236{
237#ifdef CONFIG_HIGHMEM
238 pgd_t *pgd;
239 pud_t *pud;
240 pmd_t *pmd;
241 pte_t *pte;
242 int i, j, k;
243 unsigned long vaddr;
244
245 vaddr = start;
246 i = pgd_index(vaddr);
247 j = pud_index(vaddr);
248 k = pmd_index(vaddr);
249 pgd = pgd_base + i;
250
251 for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
252 pud = (pud_t *)pgd;
253 for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
254 pmd = (pmd_t *)pud;
255 for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
256 if (pmd_none(*pmd)) {
257 pte = (pte_t *) memblock_alloc_low(PAGE_SIZE,
258 PAGE_SIZE);
259 if (!pte)
260 panic("%s: Failed to allocate %lu bytes align=%lx\n",
261 __func__, PAGE_SIZE,
262 PAGE_SIZE);
263
264 set_pmd(pmd, __pmd((unsigned long)pte));
265 BUG_ON(pte != pte_offset_kernel(pmd, 0));
266 }
267 vaddr += PMD_SIZE;
268 }
269 k = 0;
270 }
271 j = 0;
272 }
273#endif
274}
275
276struct maar_walk_info {
277 struct maar_config cfg[16];
278 unsigned int num_cfg;
279};
280
281static int maar_res_walk(unsigned long start_pfn, unsigned long nr_pages,
282 void *data)
283{
284 struct maar_walk_info *wi = data;
285 struct maar_config *cfg = &wi->cfg[wi->num_cfg];
286 unsigned int maar_align;
287
288 /* MAAR registers hold physical addresses right shifted by 4 bits */
289 maar_align = BIT(MIPS_MAAR_ADDR_SHIFT + 4);
290
291 /* Fill in the MAAR config entry */
292 cfg->lower = ALIGN(PFN_PHYS(start_pfn), maar_align);
293 cfg->upper = ALIGN_DOWN(PFN_PHYS(start_pfn + nr_pages), maar_align) - 1;
294 cfg->attrs = MIPS_MAAR_S;
295
296 /* Ensure we don't overflow the cfg array */
297 if (!WARN_ON(wi->num_cfg >= ARRAY_SIZE(wi->cfg)))
298 wi->num_cfg++;
299
300 return 0;
301}
302
303
304unsigned __weak platform_maar_init(unsigned num_pairs)
305{
306 unsigned int num_configured;
307 struct maar_walk_info wi;
308
309 wi.num_cfg = 0;
310 walk_system_ram_range(0, max_pfn, &wi, maar_res_walk);
311
312 num_configured = maar_config(wi.cfg, wi.num_cfg, num_pairs);
313 if (num_configured < wi.num_cfg)
314 pr_warn("Not enough MAAR pairs (%u) for all memory regions (%u)\n",
315 num_pairs, wi.num_cfg);
316
317 return num_configured;
318}
319
320void maar_init(void)
321{
322 unsigned num_maars, used, i;
323 phys_addr_t lower, upper, attr;
324 static struct {
325 struct maar_config cfgs[3];
326 unsigned used;
327 } recorded = { { { 0 } }, 0 };
328
329 if (!cpu_has_maar)
330 return;
331
332 /* Detect the number of MAARs */
333 write_c0_maari(~0);
334 back_to_back_c0_hazard();
335 num_maars = read_c0_maari() + 1;
336
337 /* MAARs should be in pairs */
338 WARN_ON(num_maars % 2);
339
340 /* Set MAARs using values we recorded already */
341 if (recorded.used) {
342 used = maar_config(recorded.cfgs, recorded.used, num_maars / 2);
343 BUG_ON(used != recorded.used);
344 } else {
345 /* Configure the required MAARs */
346 used = platform_maar_init(num_maars / 2);
347 }
348
349 /* Disable any further MAARs */
350 for (i = (used * 2); i < num_maars; i++) {
351 write_c0_maari(i);
352 back_to_back_c0_hazard();
353 write_c0_maar(0);
354 back_to_back_c0_hazard();
355 }
356
357 if (recorded.used)
358 return;
359
360 pr_info("MAAR configuration:\n");
361 for (i = 0; i < num_maars; i += 2) {
362 write_c0_maari(i);
363 back_to_back_c0_hazard();
364 upper = read_c0_maar();
365#ifdef CONFIG_XPA
366 upper |= (phys_addr_t)readx_c0_maar() << MIPS_MAARX_ADDR_SHIFT;
367#endif
368
369 write_c0_maari(i + 1);
370 back_to_back_c0_hazard();
371 lower = read_c0_maar();
372#ifdef CONFIG_XPA
373 lower |= (phys_addr_t)readx_c0_maar() << MIPS_MAARX_ADDR_SHIFT;
374#endif
375
376 attr = lower & upper;
377 lower = (lower & MIPS_MAAR_ADDR) << 4;
378 upper = ((upper & MIPS_MAAR_ADDR) << 4) | 0xffff;
379
380 pr_info(" [%d]: ", i / 2);
381 if ((attr & MIPS_MAAR_V) != MIPS_MAAR_V) {
382 pr_cont("disabled\n");
383 continue;
384 }
385
386 pr_cont("%pa-%pa", &lower, &upper);
387
388 if (attr & MIPS_MAAR_S)
389 pr_cont(" speculate");
390
391 pr_cont("\n");
392
393 /* Record the setup for use on secondary CPUs */
394 if (used <= ARRAY_SIZE(recorded.cfgs)) {
395 recorded.cfgs[recorded.used].lower = lower;
396 recorded.cfgs[recorded.used].upper = upper;
397 recorded.cfgs[recorded.used].attrs = attr;
398 recorded.used++;
399 }
400 }
401}
402
403#ifndef CONFIG_NUMA
404void __init paging_init(void)
405{
406 unsigned long max_zone_pfns[MAX_NR_ZONES];
407
408 pagetable_init();
409
410#ifdef CONFIG_ZONE_DMA
411 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
412#endif
413#ifdef CONFIG_ZONE_DMA32
414 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
415#endif
416 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
417#ifdef CONFIG_HIGHMEM
418 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
419
420 if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
421 printk(KERN_WARNING "This processor doesn't support highmem."
422 " %ldk highmem ignored\n",
423 (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
424 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
425
426 max_mapnr = max_low_pfn;
427 } else if (highend_pfn) {
428 max_mapnr = highend_pfn;
429 } else {
430 max_mapnr = max_low_pfn;
431 }
432#else
433 max_mapnr = max_low_pfn;
434#endif
435 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
436
437 free_area_init(max_zone_pfns);
438}
439
440#ifdef CONFIG_64BIT
441static struct kcore_list kcore_kseg0;
442#endif
443
444static inline void __init mem_init_free_highmem(void)
445{
446#ifdef CONFIG_HIGHMEM
447 unsigned long tmp;
448
449 if (cpu_has_dc_aliases)
450 return;
451
452 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
453 struct page *page = pfn_to_page(tmp);
454
455 if (!memblock_is_memory(PFN_PHYS(tmp)))
456 SetPageReserved(page);
457 else
458 free_highmem_page(page);
459 }
460#endif
461}
462
463void __init mem_init(void)
464{
465 /*
466 * When PFN_PTE_SHIFT is greater than PAGE_SHIFT we won't have enough PTE
467 * bits to hold a full 32b physical address on MIPS32 systems.
468 */
469 BUILD_BUG_ON(IS_ENABLED(CONFIG_32BIT) && (PFN_PTE_SHIFT > PAGE_SHIFT));
470
471 maar_init();
472 memblock_free_all();
473 setup_zero_pages(); /* Setup zeroed pages. */
474 mem_init_free_highmem();
475
476#ifdef CONFIG_64BIT
477 if ((unsigned long) &_text > (unsigned long) CKSEG0)
478 /* The -4 is a hack so that user tools don't have to handle
479 the overflow. */
480 kclist_add(&kcore_kseg0, (void *) CKSEG0,
481 0x80000000 - 4, KCORE_TEXT);
482#endif
483}
484#endif /* !CONFIG_NUMA */
485
486void free_init_pages(const char *what, unsigned long begin, unsigned long end)
487{
488 unsigned long pfn;
489
490 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
491 struct page *page = pfn_to_page(pfn);
492 void *addr = phys_to_virt(PFN_PHYS(pfn));
493
494 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
495 free_reserved_page(page);
496 }
497 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
498}
499
500void (*free_init_pages_eva)(void *begin, void *end) = NULL;
501
502void __weak __init prom_free_prom_memory(void)
503{
504 /* nothing to do */
505}
506
507void __ref free_initmem(void)
508{
509 prom_free_prom_memory();
510 /*
511 * Let the platform define a specific function to free the
512 * init section since EVA may have used any possible mapping
513 * between virtual and physical addresses.
514 */
515 if (free_init_pages_eva)
516 free_init_pages_eva((void *)&__init_begin, (void *)&__init_end);
517 else
518 free_initmem_default(POISON_FREE_INITMEM);
519}
520
521#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
522unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
523EXPORT_SYMBOL(__per_cpu_offset);
524
525static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
526{
527 return node_distance(cpu_to_node(from), cpu_to_node(to));
528}
529
530static int __init pcpu_cpu_to_node(int cpu)
531{
532 return cpu_to_node(cpu);
533}
534
535void __init setup_per_cpu_areas(void)
536{
537 unsigned long delta;
538 unsigned int cpu;
539 int rc;
540
541 /*
542 * Always reserve area for module percpu variables. That's
543 * what the legacy allocator did.
544 */
545 rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
546 PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
547 pcpu_cpu_distance,
548 pcpu_cpu_to_node);
549 if (rc < 0)
550 panic("Failed to initialize percpu areas.");
551
552 delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
553 for_each_possible_cpu(cpu)
554 __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
555}
556#endif
557
558#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
559unsigned long pgd_current[NR_CPUS];
560#endif
561
562/*
563 * Align swapper_pg_dir in to 64K, allows its address to be loaded
564 * with a single LUI instruction in the TLB handlers. If we used
565 * __aligned(64K), its size would get rounded up to the alignment
566 * size, and waste space. So we place it in its own section and align
567 * it in the linker script.
568 */
569pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".bss..swapper_pg_dir");
570#ifndef __PAGETABLE_PUD_FOLDED
571pud_t invalid_pud_table[PTRS_PER_PUD] __page_aligned_bss;
572#endif
573#ifndef __PAGETABLE_PMD_FOLDED
574pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
575EXPORT_SYMBOL_GPL(invalid_pmd_table);
576#endif
577pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
578EXPORT_SYMBOL(invalid_pte_table);