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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Based on arch/arm/mm/init.c
4 *
5 * Copyright (C) 1995-2005 Russell King
6 * Copyright (C) 2012 ARM Ltd.
7 */
8
9#include <linux/kernel.h>
10#include <linux/export.h>
11#include <linux/errno.h>
12#include <linux/swap.h>
13#include <linux/init.h>
14#include <linux/cache.h>
15#include <linux/mman.h>
16#include <linux/nodemask.h>
17#include <linux/initrd.h>
18#include <linux/gfp.h>
19#include <linux/memblock.h>
20#include <linux/sort.h>
21#include <linux/of.h>
22#include <linux/of_fdt.h>
23#include <linux/dma-direct.h>
24#include <linux/dma-mapping.h>
25#include <linux/dma-contiguous.h>
26#include <linux/efi.h>
27#include <linux/swiotlb.h>
28#include <linux/vmalloc.h>
29#include <linux/mm.h>
30#include <linux/kexec.h>
31#include <linux/crash_dump.h>
32#include <linux/hugetlb.h>
33
34#include <asm/boot.h>
35#include <asm/fixmap.h>
36#include <asm/kasan.h>
37#include <asm/kernel-pgtable.h>
38#include <asm/memory.h>
39#include <asm/numa.h>
40#include <asm/sections.h>
41#include <asm/setup.h>
42#include <linux/sizes.h>
43#include <asm/tlb.h>
44#include <asm/alternative.h>
45
46#define ARM64_ZONE_DMA_BITS 30
47
48/*
49 * We need to be able to catch inadvertent references to memstart_addr
50 * that occur (potentially in generic code) before arm64_memblock_init()
51 * executes, which assigns it its actual value. So use a default value
52 * that cannot be mistaken for a real physical address.
53 */
54s64 memstart_addr __ro_after_init = -1;
55EXPORT_SYMBOL(memstart_addr);
56
57s64 physvirt_offset __ro_after_init;
58EXPORT_SYMBOL(physvirt_offset);
59
60struct page *vmemmap __ro_after_init;
61EXPORT_SYMBOL(vmemmap);
62
63/*
64 * We create both ZONE_DMA and ZONE_DMA32. ZONE_DMA covers the first 1G of
65 * memory as some devices, namely the Raspberry Pi 4, have peripherals with
66 * this limited view of the memory. ZONE_DMA32 will cover the rest of the 32
67 * bit addressable memory area.
68 */
69phys_addr_t arm64_dma_phys_limit __ro_after_init;
70static phys_addr_t arm64_dma32_phys_limit __ro_after_init;
71
72#ifdef CONFIG_KEXEC_CORE
73/*
74 * reserve_crashkernel() - reserves memory for crash kernel
75 *
76 * This function reserves memory area given in "crashkernel=" kernel command
77 * line parameter. The memory reserved is used by dump capture kernel when
78 * primary kernel is crashing.
79 */
80static void __init reserve_crashkernel(void)
81{
82 unsigned long long crash_base, crash_size;
83 int ret;
84
85 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
86 &crash_size, &crash_base);
87 /* no crashkernel= or invalid value specified */
88 if (ret || !crash_size)
89 return;
90
91 crash_size = PAGE_ALIGN(crash_size);
92
93 if (crash_base == 0) {
94 /* Current arm64 boot protocol requires 2MB alignment */
95 crash_base = memblock_find_in_range(0, arm64_dma32_phys_limit,
96 crash_size, SZ_2M);
97 if (crash_base == 0) {
98 pr_warn("cannot allocate crashkernel (size:0x%llx)\n",
99 crash_size);
100 return;
101 }
102 } else {
103 /* User specifies base address explicitly. */
104 if (!memblock_is_region_memory(crash_base, crash_size)) {
105 pr_warn("cannot reserve crashkernel: region is not memory\n");
106 return;
107 }
108
109 if (memblock_is_region_reserved(crash_base, crash_size)) {
110 pr_warn("cannot reserve crashkernel: region overlaps reserved memory\n");
111 return;
112 }
113
114 if (!IS_ALIGNED(crash_base, SZ_2M)) {
115 pr_warn("cannot reserve crashkernel: base address is not 2MB aligned\n");
116 return;
117 }
118 }
119 memblock_reserve(crash_base, crash_size);
120
121 pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n",
122 crash_base, crash_base + crash_size, crash_size >> 20);
123
124 crashk_res.start = crash_base;
125 crashk_res.end = crash_base + crash_size - 1;
126}
127#else
128static void __init reserve_crashkernel(void)
129{
130}
131#endif /* CONFIG_KEXEC_CORE */
132
133#ifdef CONFIG_CRASH_DUMP
134static int __init early_init_dt_scan_elfcorehdr(unsigned long node,
135 const char *uname, int depth, void *data)
136{
137 const __be32 *reg;
138 int len;
139
140 if (depth != 1 || strcmp(uname, "chosen") != 0)
141 return 0;
142
143 reg = of_get_flat_dt_prop(node, "linux,elfcorehdr", &len);
144 if (!reg || (len < (dt_root_addr_cells + dt_root_size_cells)))
145 return 1;
146
147 elfcorehdr_addr = dt_mem_next_cell(dt_root_addr_cells, ®);
148 elfcorehdr_size = dt_mem_next_cell(dt_root_size_cells, ®);
149
150 return 1;
151}
152
153/*
154 * reserve_elfcorehdr() - reserves memory for elf core header
155 *
156 * This function reserves the memory occupied by an elf core header
157 * described in the device tree. This region contains all the
158 * information about primary kernel's core image and is used by a dump
159 * capture kernel to access the system memory on primary kernel.
160 */
161static void __init reserve_elfcorehdr(void)
162{
163 of_scan_flat_dt(early_init_dt_scan_elfcorehdr, NULL);
164
165 if (!elfcorehdr_size)
166 return;
167
168 if (memblock_is_region_reserved(elfcorehdr_addr, elfcorehdr_size)) {
169 pr_warn("elfcorehdr is overlapped\n");
170 return;
171 }
172
173 memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
174
175 pr_info("Reserving %lldKB of memory at 0x%llx for elfcorehdr\n",
176 elfcorehdr_size >> 10, elfcorehdr_addr);
177}
178#else
179static void __init reserve_elfcorehdr(void)
180{
181}
182#endif /* CONFIG_CRASH_DUMP */
183
184/*
185 * Return the maximum physical address for a zone with a given address size
186 * limit. It currently assumes that for memory starting above 4G, 32-bit
187 * devices will use a DMA offset.
188 */
189static phys_addr_t __init max_zone_phys(unsigned int zone_bits)
190{
191 phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, zone_bits);
192 return min(offset + (1ULL << zone_bits), memblock_end_of_DRAM());
193}
194
195static void __init zone_sizes_init(unsigned long min, unsigned long max)
196{
197 unsigned long max_zone_pfns[MAX_NR_ZONES] = {0};
198
199#ifdef CONFIG_ZONE_DMA
200 max_zone_pfns[ZONE_DMA] = PFN_DOWN(arm64_dma_phys_limit);
201#endif
202#ifdef CONFIG_ZONE_DMA32
203 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(arm64_dma32_phys_limit);
204#endif
205 max_zone_pfns[ZONE_NORMAL] = max;
206
207 free_area_init(max_zone_pfns);
208}
209
210int pfn_valid(unsigned long pfn)
211{
212 phys_addr_t addr = pfn << PAGE_SHIFT;
213
214 if ((addr >> PAGE_SHIFT) != pfn)
215 return 0;
216
217#ifdef CONFIG_SPARSEMEM
218 if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
219 return 0;
220
221 if (!valid_section(__pfn_to_section(pfn)))
222 return 0;
223#endif
224 return memblock_is_map_memory(addr);
225}
226EXPORT_SYMBOL(pfn_valid);
227
228static phys_addr_t memory_limit = PHYS_ADDR_MAX;
229
230/*
231 * Limit the memory size that was specified via FDT.
232 */
233static int __init early_mem(char *p)
234{
235 if (!p)
236 return 1;
237
238 memory_limit = memparse(p, &p) & PAGE_MASK;
239 pr_notice("Memory limited to %lldMB\n", memory_limit >> 20);
240
241 return 0;
242}
243early_param("mem", early_mem);
244
245static int __init early_init_dt_scan_usablemem(unsigned long node,
246 const char *uname, int depth, void *data)
247{
248 struct memblock_region *usablemem = data;
249 const __be32 *reg;
250 int len;
251
252 if (depth != 1 || strcmp(uname, "chosen") != 0)
253 return 0;
254
255 reg = of_get_flat_dt_prop(node, "linux,usable-memory-range", &len);
256 if (!reg || (len < (dt_root_addr_cells + dt_root_size_cells)))
257 return 1;
258
259 usablemem->base = dt_mem_next_cell(dt_root_addr_cells, ®);
260 usablemem->size = dt_mem_next_cell(dt_root_size_cells, ®);
261
262 return 1;
263}
264
265static void __init fdt_enforce_memory_region(void)
266{
267 struct memblock_region reg = {
268 .size = 0,
269 };
270
271 of_scan_flat_dt(early_init_dt_scan_usablemem, ®);
272
273 if (reg.size)
274 memblock_cap_memory_range(reg.base, reg.size);
275}
276
277void __init arm64_memblock_init(void)
278{
279 const s64 linear_region_size = BIT(vabits_actual - 1);
280
281 /* Handle linux,usable-memory-range property */
282 fdt_enforce_memory_region();
283
284 /* Remove memory above our supported physical address size */
285 memblock_remove(1ULL << PHYS_MASK_SHIFT, ULLONG_MAX);
286
287 /*
288 * Select a suitable value for the base of physical memory.
289 */
290 memstart_addr = round_down(memblock_start_of_DRAM(),
291 ARM64_MEMSTART_ALIGN);
292
293 physvirt_offset = PHYS_OFFSET - PAGE_OFFSET;
294
295 vmemmap = ((struct page *)VMEMMAP_START - (memstart_addr >> PAGE_SHIFT));
296
297 /*
298 * If we are running with a 52-bit kernel VA config on a system that
299 * does not support it, we have to offset our vmemmap and physvirt_offset
300 * s.t. we avoid the 52-bit portion of the direct linear map
301 */
302 if (IS_ENABLED(CONFIG_ARM64_VA_BITS_52) && (vabits_actual != 52)) {
303 vmemmap += (_PAGE_OFFSET(48) - _PAGE_OFFSET(52)) >> PAGE_SHIFT;
304 physvirt_offset = PHYS_OFFSET - _PAGE_OFFSET(48);
305 }
306
307 /*
308 * Remove the memory that we will not be able to cover with the
309 * linear mapping. Take care not to clip the kernel which may be
310 * high in memory.
311 */
312 memblock_remove(max_t(u64, memstart_addr + linear_region_size,
313 __pa_symbol(_end)), ULLONG_MAX);
314 if (memstart_addr + linear_region_size < memblock_end_of_DRAM()) {
315 /* ensure that memstart_addr remains sufficiently aligned */
316 memstart_addr = round_up(memblock_end_of_DRAM() - linear_region_size,
317 ARM64_MEMSTART_ALIGN);
318 memblock_remove(0, memstart_addr);
319 }
320
321 /*
322 * Apply the memory limit if it was set. Since the kernel may be loaded
323 * high up in memory, add back the kernel region that must be accessible
324 * via the linear mapping.
325 */
326 if (memory_limit != PHYS_ADDR_MAX) {
327 memblock_mem_limit_remove_map(memory_limit);
328 memblock_add(__pa_symbol(_text), (u64)(_end - _text));
329 }
330
331 if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && phys_initrd_size) {
332 /*
333 * Add back the memory we just removed if it results in the
334 * initrd to become inaccessible via the linear mapping.
335 * Otherwise, this is a no-op
336 */
337 u64 base = phys_initrd_start & PAGE_MASK;
338 u64 size = PAGE_ALIGN(phys_initrd_start + phys_initrd_size) - base;
339
340 /*
341 * We can only add back the initrd memory if we don't end up
342 * with more memory than we can address via the linear mapping.
343 * It is up to the bootloader to position the kernel and the
344 * initrd reasonably close to each other (i.e., within 32 GB of
345 * each other) so that all granule/#levels combinations can
346 * always access both.
347 */
348 if (WARN(base < memblock_start_of_DRAM() ||
349 base + size > memblock_start_of_DRAM() +
350 linear_region_size,
351 "initrd not fully accessible via the linear mapping -- please check your bootloader ...\n")) {
352 phys_initrd_size = 0;
353 } else {
354 memblock_remove(base, size); /* clear MEMBLOCK_ flags */
355 memblock_add(base, size);
356 memblock_reserve(base, size);
357 }
358 }
359
360 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
361 extern u16 memstart_offset_seed;
362 u64 range = linear_region_size -
363 (memblock_end_of_DRAM() - memblock_start_of_DRAM());
364
365 /*
366 * If the size of the linear region exceeds, by a sufficient
367 * margin, the size of the region that the available physical
368 * memory spans, randomize the linear region as well.
369 */
370 if (memstart_offset_seed > 0 && range >= ARM64_MEMSTART_ALIGN) {
371 range /= ARM64_MEMSTART_ALIGN;
372 memstart_addr -= ARM64_MEMSTART_ALIGN *
373 ((range * memstart_offset_seed) >> 16);
374 }
375 }
376
377 /*
378 * Register the kernel text, kernel data, initrd, and initial
379 * pagetables with memblock.
380 */
381 memblock_reserve(__pa_symbol(_text), _end - _text);
382 if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && phys_initrd_size) {
383 /* the generic initrd code expects virtual addresses */
384 initrd_start = __phys_to_virt(phys_initrd_start);
385 initrd_end = initrd_start + phys_initrd_size;
386 }
387
388 early_init_fdt_scan_reserved_mem();
389
390 if (IS_ENABLED(CONFIG_ZONE_DMA)) {
391 zone_dma_bits = ARM64_ZONE_DMA_BITS;
392 arm64_dma_phys_limit = max_zone_phys(ARM64_ZONE_DMA_BITS);
393 }
394
395 if (IS_ENABLED(CONFIG_ZONE_DMA32))
396 arm64_dma32_phys_limit = max_zone_phys(32);
397 else
398 arm64_dma32_phys_limit = PHYS_MASK + 1;
399
400 reserve_crashkernel();
401
402 reserve_elfcorehdr();
403
404 high_memory = __va(memblock_end_of_DRAM() - 1) + 1;
405
406 dma_contiguous_reserve(arm64_dma32_phys_limit);
407}
408
409void __init bootmem_init(void)
410{
411 unsigned long min, max;
412
413 min = PFN_UP(memblock_start_of_DRAM());
414 max = PFN_DOWN(memblock_end_of_DRAM());
415
416 early_memtest(min << PAGE_SHIFT, max << PAGE_SHIFT);
417
418 max_pfn = max_low_pfn = max;
419 min_low_pfn = min;
420
421 arm64_numa_init();
422
423 /*
424 * must be done after arm64_numa_init() which calls numa_init() to
425 * initialize node_online_map that gets used in hugetlb_cma_reserve()
426 * while allocating required CMA size across online nodes.
427 */
428#if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_CMA)
429 arm64_hugetlb_cma_reserve();
430#endif
431
432 /*
433 * sparse_init() tries to allocate memory from memblock, so must be
434 * done after the fixed reservations
435 */
436 sparse_init();
437 zone_sizes_init(min, max);
438
439 memblock_dump_all();
440}
441
442#ifndef CONFIG_SPARSEMEM_VMEMMAP
443static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
444{
445 struct page *start_pg, *end_pg;
446 unsigned long pg, pgend;
447
448 /*
449 * Convert start_pfn/end_pfn to a struct page pointer.
450 */
451 start_pg = pfn_to_page(start_pfn - 1) + 1;
452 end_pg = pfn_to_page(end_pfn - 1) + 1;
453
454 /*
455 * Convert to physical addresses, and round start upwards and end
456 * downwards.
457 */
458 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
459 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
460
461 /*
462 * If there are free pages between these, free the section of the
463 * memmap array.
464 */
465 if (pg < pgend)
466 memblock_free(pg, pgend - pg);
467}
468
469/*
470 * The mem_map array can get very big. Free the unused area of the memory map.
471 */
472static void __init free_unused_memmap(void)
473{
474 unsigned long start, prev_end = 0;
475 struct memblock_region *reg;
476
477 for_each_memblock(memory, reg) {
478 start = __phys_to_pfn(reg->base);
479
480#ifdef CONFIG_SPARSEMEM
481 /*
482 * Take care not to free memmap entries that don't exist due
483 * to SPARSEMEM sections which aren't present.
484 */
485 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
486#endif
487 /*
488 * If we had a previous bank, and there is a space between the
489 * current bank and the previous, free it.
490 */
491 if (prev_end && prev_end < start)
492 free_memmap(prev_end, start);
493
494 /*
495 * Align up here since the VM subsystem insists that the
496 * memmap entries are valid from the bank end aligned to
497 * MAX_ORDER_NR_PAGES.
498 */
499 prev_end = ALIGN(__phys_to_pfn(reg->base + reg->size),
500 MAX_ORDER_NR_PAGES);
501 }
502
503#ifdef CONFIG_SPARSEMEM
504 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
505 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
506#endif
507}
508#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
509
510/*
511 * mem_init() marks the free areas in the mem_map and tells us how much memory
512 * is free. This is done after various parts of the system have claimed their
513 * memory after the kernel image.
514 */
515void __init mem_init(void)
516{
517 if (swiotlb_force == SWIOTLB_FORCE ||
518 max_pfn > PFN_DOWN(arm64_dma_phys_limit ? : arm64_dma32_phys_limit))
519 swiotlb_init(1);
520 else
521 swiotlb_force = SWIOTLB_NO_FORCE;
522
523 set_max_mapnr(max_pfn - PHYS_PFN_OFFSET);
524
525#ifndef CONFIG_SPARSEMEM_VMEMMAP
526 free_unused_memmap();
527#endif
528 /* this will put all unused low memory onto the freelists */
529 memblock_free_all();
530
531 mem_init_print_info(NULL);
532
533 /*
534 * Check boundaries twice: Some fundamental inconsistencies can be
535 * detected at build time already.
536 */
537#ifdef CONFIG_COMPAT
538 BUILD_BUG_ON(TASK_SIZE_32 > DEFAULT_MAP_WINDOW_64);
539#endif
540
541 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
542 extern int sysctl_overcommit_memory;
543 /*
544 * On a machine this small we won't get anywhere without
545 * overcommit, so turn it on by default.
546 */
547 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
548 }
549}
550
551void free_initmem(void)
552{
553 free_reserved_area(lm_alias(__init_begin),
554 lm_alias(__init_end),
555 POISON_FREE_INITMEM, "unused kernel");
556 /*
557 * Unmap the __init region but leave the VM area in place. This
558 * prevents the region from being reused for kernel modules, which
559 * is not supported by kallsyms.
560 */
561 unmap_kernel_range((u64)__init_begin, (u64)(__init_end - __init_begin));
562}
563
564void dump_mem_limit(void)
565{
566 if (memory_limit != PHYS_ADDR_MAX) {
567 pr_emerg("Memory Limit: %llu MB\n", memory_limit >> 20);
568 } else {
569 pr_emerg("Memory Limit: none\n");
570 }
571}
1/*
2 * Based on arch/arm/mm/init.c
3 *
4 * Copyright (C) 1995-2005 Russell King
5 * Copyright (C) 2012 ARM Ltd.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <linux/kernel.h>
21#include <linux/export.h>
22#include <linux/errno.h>
23#include <linux/swap.h>
24#include <linux/init.h>
25#include <linux/bootmem.h>
26#include <linux/cache.h>
27#include <linux/mman.h>
28#include <linux/nodemask.h>
29#include <linux/initrd.h>
30#include <linux/gfp.h>
31#include <linux/memblock.h>
32#include <linux/sort.h>
33#include <linux/of.h>
34#include <linux/of_fdt.h>
35#include <linux/dma-mapping.h>
36#include <linux/dma-contiguous.h>
37#include <linux/efi.h>
38#include <linux/swiotlb.h>
39#include <linux/vmalloc.h>
40#include <linux/mm.h>
41#include <linux/kexec.h>
42#include <linux/crash_dump.h>
43
44#include <asm/boot.h>
45#include <asm/fixmap.h>
46#include <asm/kasan.h>
47#include <asm/kernel-pgtable.h>
48#include <asm/memory.h>
49#include <asm/numa.h>
50#include <asm/sections.h>
51#include <asm/setup.h>
52#include <asm/sizes.h>
53#include <asm/tlb.h>
54#include <asm/alternative.h>
55
56/*
57 * We need to be able to catch inadvertent references to memstart_addr
58 * that occur (potentially in generic code) before arm64_memblock_init()
59 * executes, which assigns it its actual value. So use a default value
60 * that cannot be mistaken for a real physical address.
61 */
62s64 memstart_addr __ro_after_init = -1;
63phys_addr_t arm64_dma_phys_limit __ro_after_init;
64
65#ifdef CONFIG_BLK_DEV_INITRD
66static int __init early_initrd(char *p)
67{
68 unsigned long start, size;
69 char *endp;
70
71 start = memparse(p, &endp);
72 if (*endp == ',') {
73 size = memparse(endp + 1, NULL);
74
75 initrd_start = start;
76 initrd_end = start + size;
77 }
78 return 0;
79}
80early_param("initrd", early_initrd);
81#endif
82
83#ifdef CONFIG_KEXEC_CORE
84/*
85 * reserve_crashkernel() - reserves memory for crash kernel
86 *
87 * This function reserves memory area given in "crashkernel=" kernel command
88 * line parameter. The memory reserved is used by dump capture kernel when
89 * primary kernel is crashing.
90 */
91static void __init reserve_crashkernel(void)
92{
93 unsigned long long crash_base, crash_size;
94 int ret;
95
96 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
97 &crash_size, &crash_base);
98 /* no crashkernel= or invalid value specified */
99 if (ret || !crash_size)
100 return;
101
102 crash_size = PAGE_ALIGN(crash_size);
103
104 if (crash_base == 0) {
105 /* Current arm64 boot protocol requires 2MB alignment */
106 crash_base = memblock_find_in_range(0, ARCH_LOW_ADDRESS_LIMIT,
107 crash_size, SZ_2M);
108 if (crash_base == 0) {
109 pr_warn("cannot allocate crashkernel (size:0x%llx)\n",
110 crash_size);
111 return;
112 }
113 } else {
114 /* User specifies base address explicitly. */
115 if (!memblock_is_region_memory(crash_base, crash_size)) {
116 pr_warn("cannot reserve crashkernel: region is not memory\n");
117 return;
118 }
119
120 if (memblock_is_region_reserved(crash_base, crash_size)) {
121 pr_warn("cannot reserve crashkernel: region overlaps reserved memory\n");
122 return;
123 }
124
125 if (!IS_ALIGNED(crash_base, SZ_2M)) {
126 pr_warn("cannot reserve crashkernel: base address is not 2MB aligned\n");
127 return;
128 }
129 }
130 memblock_reserve(crash_base, crash_size);
131
132 pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n",
133 crash_base, crash_base + crash_size, crash_size >> 20);
134
135 crashk_res.start = crash_base;
136 crashk_res.end = crash_base + crash_size - 1;
137}
138
139static void __init kexec_reserve_crashkres_pages(void)
140{
141#ifdef CONFIG_HIBERNATION
142 phys_addr_t addr;
143 struct page *page;
144
145 if (!crashk_res.end)
146 return;
147
148 /*
149 * To reduce the size of hibernation image, all the pages are
150 * marked as Reserved initially.
151 */
152 for (addr = crashk_res.start; addr < (crashk_res.end + 1);
153 addr += PAGE_SIZE) {
154 page = phys_to_page(addr);
155 SetPageReserved(page);
156 }
157#endif
158}
159#else
160static void __init reserve_crashkernel(void)
161{
162}
163
164static void __init kexec_reserve_crashkres_pages(void)
165{
166}
167#endif /* CONFIG_KEXEC_CORE */
168
169#ifdef CONFIG_CRASH_DUMP
170static int __init early_init_dt_scan_elfcorehdr(unsigned long node,
171 const char *uname, int depth, void *data)
172{
173 const __be32 *reg;
174 int len;
175
176 if (depth != 1 || strcmp(uname, "chosen") != 0)
177 return 0;
178
179 reg = of_get_flat_dt_prop(node, "linux,elfcorehdr", &len);
180 if (!reg || (len < (dt_root_addr_cells + dt_root_size_cells)))
181 return 1;
182
183 elfcorehdr_addr = dt_mem_next_cell(dt_root_addr_cells, ®);
184 elfcorehdr_size = dt_mem_next_cell(dt_root_size_cells, ®);
185
186 return 1;
187}
188
189/*
190 * reserve_elfcorehdr() - reserves memory for elf core header
191 *
192 * This function reserves the memory occupied by an elf core header
193 * described in the device tree. This region contains all the
194 * information about primary kernel's core image and is used by a dump
195 * capture kernel to access the system memory on primary kernel.
196 */
197static void __init reserve_elfcorehdr(void)
198{
199 of_scan_flat_dt(early_init_dt_scan_elfcorehdr, NULL);
200
201 if (!elfcorehdr_size)
202 return;
203
204 if (memblock_is_region_reserved(elfcorehdr_addr, elfcorehdr_size)) {
205 pr_warn("elfcorehdr is overlapped\n");
206 return;
207 }
208
209 memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
210
211 pr_info("Reserving %lldKB of memory at 0x%llx for elfcorehdr\n",
212 elfcorehdr_size >> 10, elfcorehdr_addr);
213}
214#else
215static void __init reserve_elfcorehdr(void)
216{
217}
218#endif /* CONFIG_CRASH_DUMP */
219/*
220 * Return the maximum physical address for ZONE_DMA32 (DMA_BIT_MASK(32)). It
221 * currently assumes that for memory starting above 4G, 32-bit devices will
222 * use a DMA offset.
223 */
224static phys_addr_t __init max_zone_dma_phys(void)
225{
226 phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
227 return min(offset + (1ULL << 32), memblock_end_of_DRAM());
228}
229
230#ifdef CONFIG_NUMA
231
232static void __init zone_sizes_init(unsigned long min, unsigned long max)
233{
234 unsigned long max_zone_pfns[MAX_NR_ZONES] = {0};
235
236 if (IS_ENABLED(CONFIG_ZONE_DMA32))
237 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(max_zone_dma_phys());
238 max_zone_pfns[ZONE_NORMAL] = max;
239
240 free_area_init_nodes(max_zone_pfns);
241}
242
243#else
244
245static void __init zone_sizes_init(unsigned long min, unsigned long max)
246{
247 struct memblock_region *reg;
248 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
249 unsigned long max_dma = min;
250
251 memset(zone_size, 0, sizeof(zone_size));
252
253 /* 4GB maximum for 32-bit only capable devices */
254#ifdef CONFIG_ZONE_DMA32
255 max_dma = PFN_DOWN(arm64_dma_phys_limit);
256 zone_size[ZONE_DMA32] = max_dma - min;
257#endif
258 zone_size[ZONE_NORMAL] = max - max_dma;
259
260 memcpy(zhole_size, zone_size, sizeof(zhole_size));
261
262 for_each_memblock(memory, reg) {
263 unsigned long start = memblock_region_memory_base_pfn(reg);
264 unsigned long end = memblock_region_memory_end_pfn(reg);
265
266 if (start >= max)
267 continue;
268
269#ifdef CONFIG_ZONE_DMA32
270 if (start < max_dma) {
271 unsigned long dma_end = min(end, max_dma);
272 zhole_size[ZONE_DMA32] -= dma_end - start;
273 }
274#endif
275 if (end > max_dma) {
276 unsigned long normal_end = min(end, max);
277 unsigned long normal_start = max(start, max_dma);
278 zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
279 }
280 }
281
282 free_area_init_node(0, zone_size, min, zhole_size);
283}
284
285#endif /* CONFIG_NUMA */
286
287#ifdef CONFIG_HAVE_ARCH_PFN_VALID
288int pfn_valid(unsigned long pfn)
289{
290 return memblock_is_map_memory(pfn << PAGE_SHIFT);
291}
292EXPORT_SYMBOL(pfn_valid);
293#endif
294
295#ifndef CONFIG_SPARSEMEM
296static void __init arm64_memory_present(void)
297{
298}
299#else
300static void __init arm64_memory_present(void)
301{
302 struct memblock_region *reg;
303
304 for_each_memblock(memory, reg) {
305 int nid = memblock_get_region_node(reg);
306
307 memory_present(nid, memblock_region_memory_base_pfn(reg),
308 memblock_region_memory_end_pfn(reg));
309 }
310}
311#endif
312
313static phys_addr_t memory_limit = (phys_addr_t)ULLONG_MAX;
314
315/*
316 * Limit the memory size that was specified via FDT.
317 */
318static int __init early_mem(char *p)
319{
320 if (!p)
321 return 1;
322
323 memory_limit = memparse(p, &p) & PAGE_MASK;
324 pr_notice("Memory limited to %lldMB\n", memory_limit >> 20);
325
326 return 0;
327}
328early_param("mem", early_mem);
329
330static int __init early_init_dt_scan_usablemem(unsigned long node,
331 const char *uname, int depth, void *data)
332{
333 struct memblock_region *usablemem = data;
334 const __be32 *reg;
335 int len;
336
337 if (depth != 1 || strcmp(uname, "chosen") != 0)
338 return 0;
339
340 reg = of_get_flat_dt_prop(node, "linux,usable-memory-range", &len);
341 if (!reg || (len < (dt_root_addr_cells + dt_root_size_cells)))
342 return 1;
343
344 usablemem->base = dt_mem_next_cell(dt_root_addr_cells, ®);
345 usablemem->size = dt_mem_next_cell(dt_root_size_cells, ®);
346
347 return 1;
348}
349
350static void __init fdt_enforce_memory_region(void)
351{
352 struct memblock_region reg = {
353 .size = 0,
354 };
355
356 of_scan_flat_dt(early_init_dt_scan_usablemem, ®);
357
358 if (reg.size)
359 memblock_cap_memory_range(reg.base, reg.size);
360}
361
362void __init arm64_memblock_init(void)
363{
364 const s64 linear_region_size = -(s64)PAGE_OFFSET;
365
366 /* Handle linux,usable-memory-range property */
367 fdt_enforce_memory_region();
368
369 /* Remove memory above our supported physical address size */
370 memblock_remove(1ULL << PHYS_MASK_SHIFT, ULLONG_MAX);
371
372 /*
373 * Ensure that the linear region takes up exactly half of the kernel
374 * virtual address space. This way, we can distinguish a linear address
375 * from a kernel/module/vmalloc address by testing a single bit.
376 */
377 BUILD_BUG_ON(linear_region_size != BIT(VA_BITS - 1));
378
379 /*
380 * Select a suitable value for the base of physical memory.
381 */
382 memstart_addr = round_down(memblock_start_of_DRAM(),
383 ARM64_MEMSTART_ALIGN);
384
385 /*
386 * Remove the memory that we will not be able to cover with the
387 * linear mapping. Take care not to clip the kernel which may be
388 * high in memory.
389 */
390 memblock_remove(max_t(u64, memstart_addr + linear_region_size,
391 __pa_symbol(_end)), ULLONG_MAX);
392 if (memstart_addr + linear_region_size < memblock_end_of_DRAM()) {
393 /* ensure that memstart_addr remains sufficiently aligned */
394 memstart_addr = round_up(memblock_end_of_DRAM() - linear_region_size,
395 ARM64_MEMSTART_ALIGN);
396 memblock_remove(0, memstart_addr);
397 }
398
399 /*
400 * Apply the memory limit if it was set. Since the kernel may be loaded
401 * high up in memory, add back the kernel region that must be accessible
402 * via the linear mapping.
403 */
404 if (memory_limit != (phys_addr_t)ULLONG_MAX) {
405 memblock_mem_limit_remove_map(memory_limit);
406 memblock_add(__pa_symbol(_text), (u64)(_end - _text));
407 }
408
409 if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && initrd_start) {
410 /*
411 * Add back the memory we just removed if it results in the
412 * initrd to become inaccessible via the linear mapping.
413 * Otherwise, this is a no-op
414 */
415 u64 base = initrd_start & PAGE_MASK;
416 u64 size = PAGE_ALIGN(initrd_end) - base;
417
418 /*
419 * We can only add back the initrd memory if we don't end up
420 * with more memory than we can address via the linear mapping.
421 * It is up to the bootloader to position the kernel and the
422 * initrd reasonably close to each other (i.e., within 32 GB of
423 * each other) so that all granule/#levels combinations can
424 * always access both.
425 */
426 if (WARN(base < memblock_start_of_DRAM() ||
427 base + size > memblock_start_of_DRAM() +
428 linear_region_size,
429 "initrd not fully accessible via the linear mapping -- please check your bootloader ...\n")) {
430 initrd_start = 0;
431 } else {
432 memblock_remove(base, size); /* clear MEMBLOCK_ flags */
433 memblock_add(base, size);
434 memblock_reserve(base, size);
435 }
436 }
437
438 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
439 extern u16 memstart_offset_seed;
440 u64 range = linear_region_size -
441 (memblock_end_of_DRAM() - memblock_start_of_DRAM());
442
443 /*
444 * If the size of the linear region exceeds, by a sufficient
445 * margin, the size of the region that the available physical
446 * memory spans, randomize the linear region as well.
447 */
448 if (memstart_offset_seed > 0 && range >= ARM64_MEMSTART_ALIGN) {
449 range = range / ARM64_MEMSTART_ALIGN + 1;
450 memstart_addr -= ARM64_MEMSTART_ALIGN *
451 ((range * memstart_offset_seed) >> 16);
452 }
453 }
454
455 /*
456 * Register the kernel text, kernel data, initrd, and initial
457 * pagetables with memblock.
458 */
459 memblock_reserve(__pa_symbol(_text), _end - _text);
460#ifdef CONFIG_BLK_DEV_INITRD
461 if (initrd_start) {
462 memblock_reserve(initrd_start, initrd_end - initrd_start);
463
464 /* the generic initrd code expects virtual addresses */
465 initrd_start = __phys_to_virt(initrd_start);
466 initrd_end = __phys_to_virt(initrd_end);
467 }
468#endif
469
470 early_init_fdt_scan_reserved_mem();
471
472 /* 4GB maximum for 32-bit only capable devices */
473 if (IS_ENABLED(CONFIG_ZONE_DMA32))
474 arm64_dma_phys_limit = max_zone_dma_phys();
475 else
476 arm64_dma_phys_limit = PHYS_MASK + 1;
477
478 reserve_crashkernel();
479
480 reserve_elfcorehdr();
481
482 high_memory = __va(memblock_end_of_DRAM() - 1) + 1;
483
484 dma_contiguous_reserve(arm64_dma_phys_limit);
485
486 memblock_allow_resize();
487}
488
489void __init bootmem_init(void)
490{
491 unsigned long min, max;
492
493 min = PFN_UP(memblock_start_of_DRAM());
494 max = PFN_DOWN(memblock_end_of_DRAM());
495
496 early_memtest(min << PAGE_SHIFT, max << PAGE_SHIFT);
497
498 max_pfn = max_low_pfn = max;
499
500 arm64_numa_init();
501 /*
502 * Sparsemem tries to allocate bootmem in memory_present(), so must be
503 * done after the fixed reservations.
504 */
505 arm64_memory_present();
506
507 sparse_init();
508 zone_sizes_init(min, max);
509
510 memblock_dump_all();
511}
512
513#ifndef CONFIG_SPARSEMEM_VMEMMAP
514static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
515{
516 struct page *start_pg, *end_pg;
517 unsigned long pg, pgend;
518
519 /*
520 * Convert start_pfn/end_pfn to a struct page pointer.
521 */
522 start_pg = pfn_to_page(start_pfn - 1) + 1;
523 end_pg = pfn_to_page(end_pfn - 1) + 1;
524
525 /*
526 * Convert to physical addresses, and round start upwards and end
527 * downwards.
528 */
529 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
530 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
531
532 /*
533 * If there are free pages between these, free the section of the
534 * memmap array.
535 */
536 if (pg < pgend)
537 free_bootmem(pg, pgend - pg);
538}
539
540/*
541 * The mem_map array can get very big. Free the unused area of the memory map.
542 */
543static void __init free_unused_memmap(void)
544{
545 unsigned long start, prev_end = 0;
546 struct memblock_region *reg;
547
548 for_each_memblock(memory, reg) {
549 start = __phys_to_pfn(reg->base);
550
551#ifdef CONFIG_SPARSEMEM
552 /*
553 * Take care not to free memmap entries that don't exist due
554 * to SPARSEMEM sections which aren't present.
555 */
556 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
557#endif
558 /*
559 * If we had a previous bank, and there is a space between the
560 * current bank and the previous, free it.
561 */
562 if (prev_end && prev_end < start)
563 free_memmap(prev_end, start);
564
565 /*
566 * Align up here since the VM subsystem insists that the
567 * memmap entries are valid from the bank end aligned to
568 * MAX_ORDER_NR_PAGES.
569 */
570 prev_end = ALIGN(__phys_to_pfn(reg->base + reg->size),
571 MAX_ORDER_NR_PAGES);
572 }
573
574#ifdef CONFIG_SPARSEMEM
575 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
576 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
577#endif
578}
579#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
580
581/*
582 * mem_init() marks the free areas in the mem_map and tells us how much memory
583 * is free. This is done after various parts of the system have claimed their
584 * memory after the kernel image.
585 */
586void __init mem_init(void)
587{
588 if (swiotlb_force == SWIOTLB_FORCE ||
589 max_pfn > (arm64_dma_phys_limit >> PAGE_SHIFT))
590 swiotlb_init(1);
591 else
592 swiotlb_force = SWIOTLB_NO_FORCE;
593
594 set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
595
596#ifndef CONFIG_SPARSEMEM_VMEMMAP
597 free_unused_memmap();
598#endif
599 /* this will put all unused low memory onto the freelists */
600 free_all_bootmem();
601
602 kexec_reserve_crashkres_pages();
603
604 mem_init_print_info(NULL);
605
606 /*
607 * Check boundaries twice: Some fundamental inconsistencies can be
608 * detected at build time already.
609 */
610#ifdef CONFIG_COMPAT
611 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
612#endif
613
614 /*
615 * Make sure we chose the upper bound of sizeof(struct page)
616 * correctly.
617 */
618 BUILD_BUG_ON(sizeof(struct page) > (1 << STRUCT_PAGE_MAX_SHIFT));
619
620 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
621 extern int sysctl_overcommit_memory;
622 /*
623 * On a machine this small we won't get anywhere without
624 * overcommit, so turn it on by default.
625 */
626 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
627 }
628}
629
630void free_initmem(void)
631{
632 free_reserved_area(lm_alias(__init_begin),
633 lm_alias(__init_end),
634 0, "unused kernel");
635 /*
636 * Unmap the __init region but leave the VM area in place. This
637 * prevents the region from being reused for kernel modules, which
638 * is not supported by kallsyms.
639 */
640 unmap_kernel_range((u64)__init_begin, (u64)(__init_end - __init_begin));
641}
642
643#ifdef CONFIG_BLK_DEV_INITRD
644
645static int keep_initrd __initdata;
646
647void __init free_initrd_mem(unsigned long start, unsigned long end)
648{
649 if (!keep_initrd) {
650 free_reserved_area((void *)start, (void *)end, 0, "initrd");
651 memblock_free(__virt_to_phys(start), end - start);
652 }
653}
654
655static int __init keepinitrd_setup(char *__unused)
656{
657 keep_initrd = 1;
658 return 1;
659}
660
661__setup("keepinitrd", keepinitrd_setup);
662#endif
663
664/*
665 * Dump out memory limit information on panic.
666 */
667static int dump_mem_limit(struct notifier_block *self, unsigned long v, void *p)
668{
669 if (memory_limit != (phys_addr_t)ULLONG_MAX) {
670 pr_emerg("Memory Limit: %llu MB\n", memory_limit >> 20);
671 } else {
672 pr_emerg("Memory Limit: none\n");
673 }
674 return 0;
675}
676
677static struct notifier_block mem_limit_notifier = {
678 .notifier_call = dump_mem_limit,
679};
680
681static int __init register_mem_limit_dumper(void)
682{
683 atomic_notifier_chain_register(&panic_notifier_list,
684 &mem_limit_notifier);
685 return 0;
686}
687__initcall(register_mem_limit_dumper);