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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/mman.h>
27#include <linux/nodemask.h>
28#include <linux/initrd.h>
29#include <linux/gfp.h>
30#include <linux/memblock.h>
31#include <linux/sort.h>
32#include <linux/of_fdt.h>
33#include <linux/dma-mapping.h>
34#include <linux/dma-contiguous.h>
35#include <linux/efi.h>
36#include <linux/swiotlb.h>
37
38#include <asm/boot.h>
39#include <asm/fixmap.h>
40#include <asm/kasan.h>
41#include <asm/kernel-pgtable.h>
42#include <asm/memory.h>
43#include <asm/sections.h>
44#include <asm/setup.h>
45#include <asm/sizes.h>
46#include <asm/tlb.h>
47#include <asm/alternative.h>
48
49#include "mm.h"
50
51/*
52 * We need to be able to catch inadvertent references to memstart_addr
53 * that occur (potentially in generic code) before arm64_memblock_init()
54 * executes, which assigns it its actual value. So use a default value
55 * that cannot be mistaken for a real physical address.
56 */
57s64 memstart_addr __read_mostly = -1;
58phys_addr_t arm64_dma_phys_limit __read_mostly;
59
60#ifdef CONFIG_BLK_DEV_INITRD
61static int __init early_initrd(char *p)
62{
63 unsigned long start, size;
64 char *endp;
65
66 start = memparse(p, &endp);
67 if (*endp == ',') {
68 size = memparse(endp + 1, NULL);
69
70 initrd_start = start;
71 initrd_end = start + size;
72 }
73 return 0;
74}
75early_param("initrd", early_initrd);
76#endif
77
78/*
79 * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
80 * currently assumes that for memory starting above 4G, 32-bit devices will
81 * use a DMA offset.
82 */
83static phys_addr_t __init max_zone_dma_phys(void)
84{
85 phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
86 return min(offset + (1ULL << 32), memblock_end_of_DRAM());
87}
88
89static void __init zone_sizes_init(unsigned long min, unsigned long max)
90{
91 struct memblock_region *reg;
92 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
93 unsigned long max_dma = min;
94
95 memset(zone_size, 0, sizeof(zone_size));
96
97 /* 4GB maximum for 32-bit only capable devices */
98#ifdef CONFIG_ZONE_DMA
99 max_dma = PFN_DOWN(arm64_dma_phys_limit);
100 zone_size[ZONE_DMA] = max_dma - min;
101#endif
102 zone_size[ZONE_NORMAL] = max - max_dma;
103
104 memcpy(zhole_size, zone_size, sizeof(zhole_size));
105
106 for_each_memblock(memory, reg) {
107 unsigned long start = memblock_region_memory_base_pfn(reg);
108 unsigned long end = memblock_region_memory_end_pfn(reg);
109
110 if (start >= max)
111 continue;
112
113#ifdef CONFIG_ZONE_DMA
114 if (start < max_dma) {
115 unsigned long dma_end = min(end, max_dma);
116 zhole_size[ZONE_DMA] -= dma_end - start;
117 }
118#endif
119 if (end > max_dma) {
120 unsigned long normal_end = min(end, max);
121 unsigned long normal_start = max(start, max_dma);
122 zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
123 }
124 }
125
126 free_area_init_node(0, zone_size, min, zhole_size);
127}
128
129#ifdef CONFIG_HAVE_ARCH_PFN_VALID
130int pfn_valid(unsigned long pfn)
131{
132 return memblock_is_map_memory(pfn << PAGE_SHIFT);
133}
134EXPORT_SYMBOL(pfn_valid);
135#endif
136
137#ifndef CONFIG_SPARSEMEM
138static void __init arm64_memory_present(void)
139{
140}
141#else
142static void __init arm64_memory_present(void)
143{
144 struct memblock_region *reg;
145
146 for_each_memblock(memory, reg)
147 memory_present(0, memblock_region_memory_base_pfn(reg),
148 memblock_region_memory_end_pfn(reg));
149}
150#endif
151
152static phys_addr_t memory_limit = (phys_addr_t)ULLONG_MAX;
153
154/*
155 * Limit the memory size that was specified via FDT.
156 */
157static int __init early_mem(char *p)
158{
159 if (!p)
160 return 1;
161
162 memory_limit = memparse(p, &p) & PAGE_MASK;
163 pr_notice("Memory limited to %lldMB\n", memory_limit >> 20);
164
165 return 0;
166}
167early_param("mem", early_mem);
168
169void __init arm64_memblock_init(void)
170{
171 const s64 linear_region_size = -(s64)PAGE_OFFSET;
172
173 /*
174 * Ensure that the linear region takes up exactly half of the kernel
175 * virtual address space. This way, we can distinguish a linear address
176 * from a kernel/module/vmalloc address by testing a single bit.
177 */
178 BUILD_BUG_ON(linear_region_size != BIT(VA_BITS - 1));
179
180 /*
181 * Select a suitable value for the base of physical memory.
182 */
183 memstart_addr = round_down(memblock_start_of_DRAM(),
184 ARM64_MEMSTART_ALIGN);
185
186 /*
187 * Remove the memory that we will not be able to cover with the
188 * linear mapping. Take care not to clip the kernel which may be
189 * high in memory.
190 */
191 memblock_remove(max_t(u64, memstart_addr + linear_region_size, __pa(_end)),
192 ULLONG_MAX);
193 if (memblock_end_of_DRAM() > linear_region_size)
194 memblock_remove(0, memblock_end_of_DRAM() - linear_region_size);
195
196 /*
197 * Apply the memory limit if it was set. Since the kernel may be loaded
198 * high up in memory, add back the kernel region that must be accessible
199 * via the linear mapping.
200 */
201 if (memory_limit != (phys_addr_t)ULLONG_MAX) {
202 memblock_enforce_memory_limit(memory_limit);
203 memblock_add(__pa(_text), (u64)(_end - _text));
204 }
205
206 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
207 extern u16 memstart_offset_seed;
208 u64 range = linear_region_size -
209 (memblock_end_of_DRAM() - memblock_start_of_DRAM());
210
211 /*
212 * If the size of the linear region exceeds, by a sufficient
213 * margin, the size of the region that the available physical
214 * memory spans, randomize the linear region as well.
215 */
216 if (memstart_offset_seed > 0 && range >= ARM64_MEMSTART_ALIGN) {
217 range = range / ARM64_MEMSTART_ALIGN + 1;
218 memstart_addr -= ARM64_MEMSTART_ALIGN *
219 ((range * memstart_offset_seed) >> 16);
220 }
221 }
222
223 /*
224 * Register the kernel text, kernel data, initrd, and initial
225 * pagetables with memblock.
226 */
227 memblock_reserve(__pa(_text), _end - _text);
228#ifdef CONFIG_BLK_DEV_INITRD
229 if (initrd_start) {
230 memblock_reserve(initrd_start, initrd_end - initrd_start);
231
232 /* the generic initrd code expects virtual addresses */
233 initrd_start = __phys_to_virt(initrd_start);
234 initrd_end = __phys_to_virt(initrd_end);
235 }
236#endif
237
238 early_init_fdt_scan_reserved_mem();
239
240 /* 4GB maximum for 32-bit only capable devices */
241 if (IS_ENABLED(CONFIG_ZONE_DMA))
242 arm64_dma_phys_limit = max_zone_dma_phys();
243 else
244 arm64_dma_phys_limit = PHYS_MASK + 1;
245 dma_contiguous_reserve(arm64_dma_phys_limit);
246
247 memblock_allow_resize();
248 memblock_dump_all();
249}
250
251void __init bootmem_init(void)
252{
253 unsigned long min, max;
254
255 min = PFN_UP(memblock_start_of_DRAM());
256 max = PFN_DOWN(memblock_end_of_DRAM());
257
258 early_memtest(min << PAGE_SHIFT, max << PAGE_SHIFT);
259
260 /*
261 * Sparsemem tries to allocate bootmem in memory_present(), so must be
262 * done after the fixed reservations.
263 */
264 arm64_memory_present();
265
266 sparse_init();
267 zone_sizes_init(min, max);
268
269 high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
270 max_pfn = max_low_pfn = max;
271}
272
273#ifndef CONFIG_SPARSEMEM_VMEMMAP
274static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
275{
276 struct page *start_pg, *end_pg;
277 unsigned long pg, pgend;
278
279 /*
280 * Convert start_pfn/end_pfn to a struct page pointer.
281 */
282 start_pg = pfn_to_page(start_pfn - 1) + 1;
283 end_pg = pfn_to_page(end_pfn - 1) + 1;
284
285 /*
286 * Convert to physical addresses, and round start upwards and end
287 * downwards.
288 */
289 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
290 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
291
292 /*
293 * If there are free pages between these, free the section of the
294 * memmap array.
295 */
296 if (pg < pgend)
297 free_bootmem(pg, pgend - pg);
298}
299
300/*
301 * The mem_map array can get very big. Free the unused area of the memory map.
302 */
303static void __init free_unused_memmap(void)
304{
305 unsigned long start, prev_end = 0;
306 struct memblock_region *reg;
307
308 for_each_memblock(memory, reg) {
309 start = __phys_to_pfn(reg->base);
310
311#ifdef CONFIG_SPARSEMEM
312 /*
313 * Take care not to free memmap entries that don't exist due
314 * to SPARSEMEM sections which aren't present.
315 */
316 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
317#endif
318 /*
319 * If we had a previous bank, and there is a space between the
320 * current bank and the previous, free it.
321 */
322 if (prev_end && prev_end < start)
323 free_memmap(prev_end, start);
324
325 /*
326 * Align up here since the VM subsystem insists that the
327 * memmap entries are valid from the bank end aligned to
328 * MAX_ORDER_NR_PAGES.
329 */
330 prev_end = ALIGN(__phys_to_pfn(reg->base + reg->size),
331 MAX_ORDER_NR_PAGES);
332 }
333
334#ifdef CONFIG_SPARSEMEM
335 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
336 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
337#endif
338}
339#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
340
341/*
342 * mem_init() marks the free areas in the mem_map and tells us how much memory
343 * is free. This is done after various parts of the system have claimed their
344 * memory after the kernel image.
345 */
346void __init mem_init(void)
347{
348 swiotlb_init(1);
349
350 set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
351
352#ifndef CONFIG_SPARSEMEM_VMEMMAP
353 free_unused_memmap();
354#endif
355 /* this will put all unused low memory onto the freelists */
356 free_all_bootmem();
357
358 mem_init_print_info(NULL);
359
360#define MLK(b, t) b, t, ((t) - (b)) >> 10
361#define MLM(b, t) b, t, ((t) - (b)) >> 20
362#define MLG(b, t) b, t, ((t) - (b)) >> 30
363#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
364
365 pr_notice("Virtual kernel memory layout:\n");
366#ifdef CONFIG_KASAN
367 pr_cont(" kasan : 0x%16lx - 0x%16lx (%6ld GB)\n",
368 MLG(KASAN_SHADOW_START, KASAN_SHADOW_END));
369#endif
370 pr_cont(" modules : 0x%16lx - 0x%16lx (%6ld MB)\n",
371 MLM(MODULES_VADDR, MODULES_END));
372 pr_cont(" vmalloc : 0x%16lx - 0x%16lx (%6ld GB)\n",
373 MLG(VMALLOC_START, VMALLOC_END));
374 pr_cont(" .text : 0x%p" " - 0x%p" " (%6ld KB)\n"
375 " .rodata : 0x%p" " - 0x%p" " (%6ld KB)\n"
376 " .init : 0x%p" " - 0x%p" " (%6ld KB)\n"
377 " .data : 0x%p" " - 0x%p" " (%6ld KB)\n",
378 MLK_ROUNDUP(_text, __start_rodata),
379 MLK_ROUNDUP(__start_rodata, _etext),
380 MLK_ROUNDUP(__init_begin, __init_end),
381 MLK_ROUNDUP(_sdata, _edata));
382#ifdef CONFIG_SPARSEMEM_VMEMMAP
383 pr_cont(" vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n"
384 " 0x%16lx - 0x%16lx (%6ld MB actual)\n",
385 MLG(VMEMMAP_START,
386 VMEMMAP_START + VMEMMAP_SIZE),
387 MLM((unsigned long)phys_to_page(memblock_start_of_DRAM()),
388 (unsigned long)virt_to_page(high_memory)));
389#endif
390 pr_cont(" fixed : 0x%16lx - 0x%16lx (%6ld KB)\n",
391 MLK(FIXADDR_START, FIXADDR_TOP));
392 pr_cont(" PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n",
393 MLM(PCI_IO_START, PCI_IO_END));
394 pr_cont(" memory : 0x%16lx - 0x%16lx (%6ld MB)\n",
395 MLM(__phys_to_virt(memblock_start_of_DRAM()),
396 (unsigned long)high_memory));
397
398#undef MLK
399#undef MLM
400#undef MLK_ROUNDUP
401
402 /*
403 * Check boundaries twice: Some fundamental inconsistencies can be
404 * detected at build time already.
405 */
406#ifdef CONFIG_COMPAT
407 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
408#endif
409
410 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
411 extern int sysctl_overcommit_memory;
412 /*
413 * On a machine this small we won't get anywhere without
414 * overcommit, so turn it on by default.
415 */
416 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
417 }
418}
419
420void free_initmem(void)
421{
422 free_initmem_default(0);
423 fixup_init();
424}
425
426#ifdef CONFIG_BLK_DEV_INITRD
427
428static int keep_initrd __initdata;
429
430void __init free_initrd_mem(unsigned long start, unsigned long end)
431{
432 if (!keep_initrd)
433 free_reserved_area((void *)start, (void *)end, 0, "initrd");
434}
435
436static int __init keepinitrd_setup(char *__unused)
437{
438 keep_initrd = 1;
439 return 1;
440}
441
442__setup("keepinitrd", keepinitrd_setup);
443#endif
444
445/*
446 * Dump out memory limit information on panic.
447 */
448static int dump_mem_limit(struct notifier_block *self, unsigned long v, void *p)
449{
450 if (memory_limit != (phys_addr_t)ULLONG_MAX) {
451 pr_emerg("Memory Limit: %llu MB\n", memory_limit >> 20);
452 } else {
453 pr_emerg("Memory Limit: none\n");
454 }
455 return 0;
456}
457
458static struct notifier_block mem_limit_notifier = {
459 .notifier_call = dump_mem_limit,
460};
461
462static int __init register_mem_limit_dumper(void)
463{
464 atomic_notifier_chain_register(&panic_notifier_list,
465 &mem_limit_notifier);
466 return 0;
467}
468__initcall(register_mem_limit_dumper);
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);