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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_fdt.h>
34#include <linux/dma-mapping.h>
35#include <linux/dma-contiguous.h>
36#include <linux/efi.h>
37#include <linux/swiotlb.h>
38#include <linux/vmalloc.h>
39
40#include <asm/boot.h>
41#include <asm/fixmap.h>
42#include <asm/kasan.h>
43#include <asm/kernel-pgtable.h>
44#include <asm/memory.h>
45#include <asm/numa.h>
46#include <asm/sections.h>
47#include <asm/setup.h>
48#include <asm/sizes.h>
49#include <asm/tlb.h>
50#include <asm/alternative.h>
51
52/*
53 * We need to be able to catch inadvertent references to memstart_addr
54 * that occur (potentially in generic code) before arm64_memblock_init()
55 * executes, which assigns it its actual value. So use a default value
56 * that cannot be mistaken for a real physical address.
57 */
58s64 memstart_addr __ro_after_init = -1;
59phys_addr_t arm64_dma_phys_limit __ro_after_init;
60
61#ifdef CONFIG_BLK_DEV_INITRD
62static int __init early_initrd(char *p)
63{
64 unsigned long start, size;
65 char *endp;
66
67 start = memparse(p, &endp);
68 if (*endp == ',') {
69 size = memparse(endp + 1, NULL);
70
71 initrd_start = start;
72 initrd_end = start + size;
73 }
74 return 0;
75}
76early_param("initrd", early_initrd);
77#endif
78
79/*
80 * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
81 * currently assumes that for memory starting above 4G, 32-bit devices will
82 * use a DMA offset.
83 */
84static phys_addr_t __init max_zone_dma_phys(void)
85{
86 phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
87 return min(offset + (1ULL << 32), memblock_end_of_DRAM());
88}
89
90#ifdef CONFIG_NUMA
91
92static void __init zone_sizes_init(unsigned long min, unsigned long max)
93{
94 unsigned long max_zone_pfns[MAX_NR_ZONES] = {0};
95
96 if (IS_ENABLED(CONFIG_ZONE_DMA))
97 max_zone_pfns[ZONE_DMA] = PFN_DOWN(max_zone_dma_phys());
98 max_zone_pfns[ZONE_NORMAL] = max;
99
100 free_area_init_nodes(max_zone_pfns);
101}
102
103#else
104
105static void __init zone_sizes_init(unsigned long min, unsigned long max)
106{
107 struct memblock_region *reg;
108 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
109 unsigned long max_dma = min;
110
111 memset(zone_size, 0, sizeof(zone_size));
112
113 /* 4GB maximum for 32-bit only capable devices */
114#ifdef CONFIG_ZONE_DMA
115 max_dma = PFN_DOWN(arm64_dma_phys_limit);
116 zone_size[ZONE_DMA] = max_dma - min;
117#endif
118 zone_size[ZONE_NORMAL] = max - max_dma;
119
120 memcpy(zhole_size, zone_size, sizeof(zhole_size));
121
122 for_each_memblock(memory, reg) {
123 unsigned long start = memblock_region_memory_base_pfn(reg);
124 unsigned long end = memblock_region_memory_end_pfn(reg);
125
126 if (start >= max)
127 continue;
128
129#ifdef CONFIG_ZONE_DMA
130 if (start < max_dma) {
131 unsigned long dma_end = min(end, max_dma);
132 zhole_size[ZONE_DMA] -= dma_end - start;
133 }
134#endif
135 if (end > max_dma) {
136 unsigned long normal_end = min(end, max);
137 unsigned long normal_start = max(start, max_dma);
138 zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
139 }
140 }
141
142 free_area_init_node(0, zone_size, min, zhole_size);
143}
144
145#endif /* CONFIG_NUMA */
146
147#ifdef CONFIG_HAVE_ARCH_PFN_VALID
148int pfn_valid(unsigned long pfn)
149{
150 return memblock_is_map_memory(pfn << PAGE_SHIFT);
151}
152EXPORT_SYMBOL(pfn_valid);
153#endif
154
155#ifndef CONFIG_SPARSEMEM
156static void __init arm64_memory_present(void)
157{
158}
159#else
160static void __init arm64_memory_present(void)
161{
162 struct memblock_region *reg;
163
164 for_each_memblock(memory, reg) {
165 int nid = memblock_get_region_node(reg);
166
167 memory_present(nid, memblock_region_memory_base_pfn(reg),
168 memblock_region_memory_end_pfn(reg));
169 }
170}
171#endif
172
173static phys_addr_t memory_limit = (phys_addr_t)ULLONG_MAX;
174
175/*
176 * Limit the memory size that was specified via FDT.
177 */
178static int __init early_mem(char *p)
179{
180 if (!p)
181 return 1;
182
183 memory_limit = memparse(p, &p) & PAGE_MASK;
184 pr_notice("Memory limited to %lldMB\n", memory_limit >> 20);
185
186 return 0;
187}
188early_param("mem", early_mem);
189
190void __init arm64_memblock_init(void)
191{
192 const s64 linear_region_size = -(s64)PAGE_OFFSET;
193
194 /*
195 * Ensure that the linear region takes up exactly half of the kernel
196 * virtual address space. This way, we can distinguish a linear address
197 * from a kernel/module/vmalloc address by testing a single bit.
198 */
199 BUILD_BUG_ON(linear_region_size != BIT(VA_BITS - 1));
200
201 /*
202 * Select a suitable value for the base of physical memory.
203 */
204 memstart_addr = round_down(memblock_start_of_DRAM(),
205 ARM64_MEMSTART_ALIGN);
206
207 /*
208 * Remove the memory that we will not be able to cover with the
209 * linear mapping. Take care not to clip the kernel which may be
210 * high in memory.
211 */
212 memblock_remove(max_t(u64, memstart_addr + linear_region_size, __pa(_end)),
213 ULLONG_MAX);
214 if (memstart_addr + linear_region_size < memblock_end_of_DRAM()) {
215 /* ensure that memstart_addr remains sufficiently aligned */
216 memstart_addr = round_up(memblock_end_of_DRAM() - linear_region_size,
217 ARM64_MEMSTART_ALIGN);
218 memblock_remove(0, memstart_addr);
219 }
220
221 /*
222 * Apply the memory limit if it was set. Since the kernel may be loaded
223 * high up in memory, add back the kernel region that must be accessible
224 * via the linear mapping.
225 */
226 if (memory_limit != (phys_addr_t)ULLONG_MAX) {
227 memblock_mem_limit_remove_map(memory_limit);
228 memblock_add(__pa(_text), (u64)(_end - _text));
229 }
230
231 if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && initrd_start) {
232 /*
233 * Add back the memory we just removed if it results in the
234 * initrd to become inaccessible via the linear mapping.
235 * Otherwise, this is a no-op
236 */
237 u64 base = initrd_start & PAGE_MASK;
238 u64 size = PAGE_ALIGN(initrd_end) - base;
239
240 /*
241 * We can only add back the initrd memory if we don't end up
242 * with more memory than we can address via the linear mapping.
243 * It is up to the bootloader to position the kernel and the
244 * initrd reasonably close to each other (i.e., within 32 GB of
245 * each other) so that all granule/#levels combinations can
246 * always access both.
247 */
248 if (WARN(base < memblock_start_of_DRAM() ||
249 base + size > memblock_start_of_DRAM() +
250 linear_region_size,
251 "initrd not fully accessible via the linear mapping -- please check your bootloader ...\n")) {
252 initrd_start = 0;
253 } else {
254 memblock_remove(base, size); /* clear MEMBLOCK_ flags */
255 memblock_add(base, size);
256 memblock_reserve(base, size);
257 }
258 }
259
260 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
261 extern u16 memstart_offset_seed;
262 u64 range = linear_region_size -
263 (memblock_end_of_DRAM() - memblock_start_of_DRAM());
264
265 /*
266 * If the size of the linear region exceeds, by a sufficient
267 * margin, the size of the region that the available physical
268 * memory spans, randomize the linear region as well.
269 */
270 if (memstart_offset_seed > 0 && range >= ARM64_MEMSTART_ALIGN) {
271 range = range / ARM64_MEMSTART_ALIGN + 1;
272 memstart_addr -= ARM64_MEMSTART_ALIGN *
273 ((range * memstart_offset_seed) >> 16);
274 }
275 }
276
277 /*
278 * Register the kernel text, kernel data, initrd, and initial
279 * pagetables with memblock.
280 */
281 memblock_reserve(__pa(_text), _end - _text);
282#ifdef CONFIG_BLK_DEV_INITRD
283 if (initrd_start) {
284 memblock_reserve(initrd_start, initrd_end - initrd_start);
285
286 /* the generic initrd code expects virtual addresses */
287 initrd_start = __phys_to_virt(initrd_start);
288 initrd_end = __phys_to_virt(initrd_end);
289 }
290#endif
291
292 early_init_fdt_scan_reserved_mem();
293
294 /* 4GB maximum for 32-bit only capable devices */
295 if (IS_ENABLED(CONFIG_ZONE_DMA))
296 arm64_dma_phys_limit = max_zone_dma_phys();
297 else
298 arm64_dma_phys_limit = PHYS_MASK + 1;
299 dma_contiguous_reserve(arm64_dma_phys_limit);
300
301 memblock_allow_resize();
302}
303
304void __init bootmem_init(void)
305{
306 unsigned long min, max;
307
308 min = PFN_UP(memblock_start_of_DRAM());
309 max = PFN_DOWN(memblock_end_of_DRAM());
310
311 early_memtest(min << PAGE_SHIFT, max << PAGE_SHIFT);
312
313 max_pfn = max_low_pfn = max;
314
315 arm64_numa_init();
316 /*
317 * Sparsemem tries to allocate bootmem in memory_present(), so must be
318 * done after the fixed reservations.
319 */
320 arm64_memory_present();
321
322 sparse_init();
323 zone_sizes_init(min, max);
324
325 high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
326 memblock_dump_all();
327}
328
329#ifndef CONFIG_SPARSEMEM_VMEMMAP
330static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
331{
332 struct page *start_pg, *end_pg;
333 unsigned long pg, pgend;
334
335 /*
336 * Convert start_pfn/end_pfn to a struct page pointer.
337 */
338 start_pg = pfn_to_page(start_pfn - 1) + 1;
339 end_pg = pfn_to_page(end_pfn - 1) + 1;
340
341 /*
342 * Convert to physical addresses, and round start upwards and end
343 * downwards.
344 */
345 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
346 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
347
348 /*
349 * If there are free pages between these, free the section of the
350 * memmap array.
351 */
352 if (pg < pgend)
353 free_bootmem(pg, pgend - pg);
354}
355
356/*
357 * The mem_map array can get very big. Free the unused area of the memory map.
358 */
359static void __init free_unused_memmap(void)
360{
361 unsigned long start, prev_end = 0;
362 struct memblock_region *reg;
363
364 for_each_memblock(memory, reg) {
365 start = __phys_to_pfn(reg->base);
366
367#ifdef CONFIG_SPARSEMEM
368 /*
369 * Take care not to free memmap entries that don't exist due
370 * to SPARSEMEM sections which aren't present.
371 */
372 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
373#endif
374 /*
375 * If we had a previous bank, and there is a space between the
376 * current bank and the previous, free it.
377 */
378 if (prev_end && prev_end < start)
379 free_memmap(prev_end, start);
380
381 /*
382 * Align up here since the VM subsystem insists that the
383 * memmap entries are valid from the bank end aligned to
384 * MAX_ORDER_NR_PAGES.
385 */
386 prev_end = ALIGN(__phys_to_pfn(reg->base + reg->size),
387 MAX_ORDER_NR_PAGES);
388 }
389
390#ifdef CONFIG_SPARSEMEM
391 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
392 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
393#endif
394}
395#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
396
397/*
398 * mem_init() marks the free areas in the mem_map and tells us how much memory
399 * is free. This is done after various parts of the system have claimed their
400 * memory after the kernel image.
401 */
402void __init mem_init(void)
403{
404 if (swiotlb_force == SWIOTLB_FORCE ||
405 max_pfn > (arm64_dma_phys_limit >> PAGE_SHIFT))
406 swiotlb_init(1);
407 else
408 swiotlb_force = SWIOTLB_NO_FORCE;
409
410 set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
411
412#ifndef CONFIG_SPARSEMEM_VMEMMAP
413 free_unused_memmap();
414#endif
415 /* this will put all unused low memory onto the freelists */
416 free_all_bootmem();
417
418 mem_init_print_info(NULL);
419
420#define MLK(b, t) b, t, ((t) - (b)) >> 10
421#define MLM(b, t) b, t, ((t) - (b)) >> 20
422#define MLG(b, t) b, t, ((t) - (b)) >> 30
423#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
424
425 pr_notice("Virtual kernel memory layout:\n");
426#ifdef CONFIG_KASAN
427 pr_notice(" kasan : 0x%16lx - 0x%16lx (%6ld GB)\n",
428 MLG(KASAN_SHADOW_START, KASAN_SHADOW_END));
429#endif
430 pr_notice(" modules : 0x%16lx - 0x%16lx (%6ld MB)\n",
431 MLM(MODULES_VADDR, MODULES_END));
432 pr_notice(" vmalloc : 0x%16lx - 0x%16lx (%6ld GB)\n",
433 MLG(VMALLOC_START, VMALLOC_END));
434 pr_notice(" .text : 0x%p" " - 0x%p" " (%6ld KB)\n",
435 MLK_ROUNDUP(_text, _etext));
436 pr_notice(" .rodata : 0x%p" " - 0x%p" " (%6ld KB)\n",
437 MLK_ROUNDUP(__start_rodata, __init_begin));
438 pr_notice(" .init : 0x%p" " - 0x%p" " (%6ld KB)\n",
439 MLK_ROUNDUP(__init_begin, __init_end));
440 pr_notice(" .data : 0x%p" " - 0x%p" " (%6ld KB)\n",
441 MLK_ROUNDUP(_sdata, _edata));
442 pr_notice(" .bss : 0x%p" " - 0x%p" " (%6ld KB)\n",
443 MLK_ROUNDUP(__bss_start, __bss_stop));
444 pr_notice(" fixed : 0x%16lx - 0x%16lx (%6ld KB)\n",
445 MLK(FIXADDR_START, FIXADDR_TOP));
446 pr_notice(" PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n",
447 MLM(PCI_IO_START, PCI_IO_END));
448#ifdef CONFIG_SPARSEMEM_VMEMMAP
449 pr_notice(" vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n",
450 MLG(VMEMMAP_START, VMEMMAP_START + VMEMMAP_SIZE));
451 pr_notice(" 0x%16lx - 0x%16lx (%6ld MB actual)\n",
452 MLM((unsigned long)phys_to_page(memblock_start_of_DRAM()),
453 (unsigned long)virt_to_page(high_memory)));
454#endif
455 pr_notice(" memory : 0x%16lx - 0x%16lx (%6ld MB)\n",
456 MLM(__phys_to_virt(memblock_start_of_DRAM()),
457 (unsigned long)high_memory));
458
459#undef MLK
460#undef MLM
461#undef MLK_ROUNDUP
462
463 /*
464 * Check boundaries twice: Some fundamental inconsistencies can be
465 * detected at build time already.
466 */
467#ifdef CONFIG_COMPAT
468 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
469#endif
470
471 /*
472 * Make sure we chose the upper bound of sizeof(struct page)
473 * correctly.
474 */
475 BUILD_BUG_ON(sizeof(struct page) > (1 << STRUCT_PAGE_MAX_SHIFT));
476
477 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
478 extern int sysctl_overcommit_memory;
479 /*
480 * On a machine this small we won't get anywhere without
481 * overcommit, so turn it on by default.
482 */
483 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
484 }
485}
486
487void free_initmem(void)
488{
489 free_reserved_area(__va(__pa(__init_begin)), __va(__pa(__init_end)),
490 0, "unused kernel");
491 /*
492 * Unmap the __init region but leave the VM area in place. This
493 * prevents the region from being reused for kernel modules, which
494 * is not supported by kallsyms.
495 */
496 unmap_kernel_range((u64)__init_begin, (u64)(__init_end - __init_begin));
497}
498
499#ifdef CONFIG_BLK_DEV_INITRD
500
501static int keep_initrd __initdata;
502
503void __init free_initrd_mem(unsigned long start, unsigned long end)
504{
505 if (!keep_initrd)
506 free_reserved_area((void *)start, (void *)end, 0, "initrd");
507}
508
509static int __init keepinitrd_setup(char *__unused)
510{
511 keep_initrd = 1;
512 return 1;
513}
514
515__setup("keepinitrd", keepinitrd_setup);
516#endif
517
518/*
519 * Dump out memory limit information on panic.
520 */
521static int dump_mem_limit(struct notifier_block *self, unsigned long v, void *p)
522{
523 if (memory_limit != (phys_addr_t)ULLONG_MAX) {
524 pr_emerg("Memory Limit: %llu MB\n", memory_limit >> 20);
525 } else {
526 pr_emerg("Memory Limit: none\n");
527 }
528 return 0;
529}
530
531static struct notifier_block mem_limit_notifier = {
532 .notifier_call = dump_mem_limit,
533};
534
535static int __init register_mem_limit_dumper(void)
536{
537 atomic_notifier_chain_register(&panic_notifier_list,
538 &mem_limit_notifier);
539 return 0;
540}
541__initcall(register_mem_limit_dumper);