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Catalin Marinasc1cc1552012-03-05 11:49:27 +00001/*
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>
Catalin Marinas19e76402014-02-27 12:09:22 +000033#include <linux/dma-mapping.h>
Laura Abbott6ac21042013-12-12 19:28:33 +000034#include <linux/dma-contiguous.h>
Leif Lindholm86c8b272014-07-28 19:03:03 +010035#include <linux/efi.h>
Catalin Marinasa1e50a82015-02-05 18:01:53 +000036#include <linux/swiotlb.h>
Catalin Marinasc1cc1552012-03-05 11:49:27 +000037
Ard Biesheuvela7f8de12016-02-16 13:52:42 +010038#include <asm/boot.h>
Catalin Marinas08375192014-07-16 17:42:43 +010039#include <asm/fixmap.h>
Ard Biesheuvelf9040772016-02-16 13:52:40 +010040#include <asm/kasan.h>
Ard Biesheuvela7f8de12016-02-16 13:52:42 +010041#include <asm/kernel-pgtable.h>
Mark Rutlandaa03c422015-01-22 18:20:35 +000042#include <asm/memory.h>
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -070043#include <asm/numa.h>
Catalin Marinasc1cc1552012-03-05 11:49:27 +000044#include <asm/sections.h>
45#include <asm/setup.h>
46#include <asm/sizes.h>
47#include <asm/tlb.h>
Andre Przywarae039ee42014-11-14 15:54:08 +000048#include <asm/alternative.h>
Catalin Marinasc1cc1552012-03-05 11:49:27 +000049
50#include "mm.h"
51
Ard Biesheuvela7f8de12016-02-16 13:52:42 +010052/*
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 */
Ard Biesheuvel020d0442016-02-26 17:57:14 +010058s64 memstart_addr __read_mostly = -1;
Catalin Marinasa1e50a82015-02-05 18:01:53 +000059phys_addr_t arm64_dma_phys_limit __read_mostly;
Catalin Marinasc1cc1552012-03-05 11:49:27 +000060
Rob Herringec2eaa72013-08-25 16:47:48 -050061#ifdef CONFIG_BLK_DEV_INITRD
Catalin Marinasc1cc1552012-03-05 11:49:27 +000062static 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
Ard Biesheuvela89dea52016-02-16 13:52:41 +010071 initrd_start = start;
72 initrd_end = start + size;
Catalin Marinasc1cc1552012-03-05 11:49:27 +000073 }
74 return 0;
75}
76early_param("initrd", early_initrd);
Rob Herringec2eaa72013-08-25 16:47:48 -050077#endif
Catalin Marinasc1cc1552012-03-05 11:49:27 +000078
Catalin Marinasd50314a2014-07-18 11:54:37 +010079/*
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 */
Jisheng Zhanga7c61a32015-11-20 17:59:10 +080084static phys_addr_t __init max_zone_dma_phys(void)
Catalin Marinasd50314a2014-07-18 11:54:37 +010085{
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
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -070090#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
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000105static 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];
Catalin Marinas19e76402014-02-27 12:09:22 +0000109 unsigned long max_dma = min;
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000110
111 memset(zone_size, 0, sizeof(zone_size));
112
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000113 /* 4GB maximum for 32-bit only capable devices */
Robin Murphy86a59062015-10-27 17:40:26 +0000114#ifdef CONFIG_ZONE_DMA
115 max_dma = PFN_DOWN(arm64_dma_phys_limit);
116 zone_size[ZONE_DMA] = max_dma - min;
117#endif
Catalin Marinas19e76402014-02-27 12:09:22 +0000118 zone_size[ZONE_NORMAL] = max - max_dma;
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000119
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;
Catalin Marinas19e76402014-02-27 12:09:22 +0000128
Robin Murphy86a59062015-10-27 17:40:26 +0000129#ifdef CONFIG_ZONE_DMA
130 if (start < max_dma) {
Catalin Marinas19e76402014-02-27 12:09:22 +0000131 unsigned long dma_end = min(end, max_dma);
132 zhole_size[ZONE_DMA] -= dma_end - start;
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000133 }
Robin Murphy86a59062015-10-27 17:40:26 +0000134#endif
Catalin Marinas19e76402014-02-27 12:09:22 +0000135 if (end > max_dma) {
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000136 unsigned long normal_end = min(end, max);
Catalin Marinas19e76402014-02-27 12:09:22 +0000137 unsigned long normal_start = max(start, max_dma);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000138 zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
139 }
140 }
141
142 free_area_init_node(0, zone_size, min, zhole_size);
143}
144
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700145#endif /* CONFIG_NUMA */
146
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000147#ifdef CONFIG_HAVE_ARCH_PFN_VALID
148int pfn_valid(unsigned long pfn)
149{
Ard Biesheuvel68709f42015-11-30 13:28:16 +0100150 return memblock_is_map_memory(pfn << PAGE_SHIFT);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000151}
152EXPORT_SYMBOL(pfn_valid);
153#endif
154
155#ifndef CONFIG_SPARSEMEM
Jisheng Zhanga7c61a32015-11-20 17:59:10 +0800156static void __init arm64_memory_present(void)
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000157{
158}
159#else
Jisheng Zhanga7c61a32015-11-20 17:59:10 +0800160static void __init arm64_memory_present(void)
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000161{
162 struct memblock_region *reg;
163
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700164 for_each_memblock(memory, reg) {
Mark Rutlandea2cbee2016-06-22 12:13:45 +0100165 int nid = memblock_get_region_node(reg);
166
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700167 memory_present(nid, memblock_region_memory_base_pfn(reg),
168 memblock_region_memory_end_pfn(reg));
169 }
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000170}
171#endif
172
Mark Rutland6083fe742015-01-15 16:42:14 +0000173static 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
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000190void __init arm64_memblock_init(void)
191{
Ard Biesheuvela7f8de12016-02-16 13:52:42 +0100192 const s64 linear_region_size = -(s64)PAGE_OFFSET;
193
194 /*
Ard Biesheuvel6d2aa549de2016-03-02 09:47:13 +0100195 * 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 /*
Ard Biesheuvela7f8de12016-02-16 13:52:42 +0100202 * 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 */
Ard Biesheuvel020d0442016-02-26 17:57:14 +0100212 memblock_remove(max_t(u64, memstart_addr + linear_region_size, __pa(_end)),
Ard Biesheuvela7f8de12016-02-16 13:52:42 +0100213 ULLONG_MAX);
Ard Biesheuvel29589872016-03-30 14:25:46 +0200214 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 }
Ard Biesheuvela7f8de12016-02-16 13:52:42 +0100220
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) {
Dennis Chencb0a6502016-07-28 15:48:29 -0700227 memblock_mem_limit_remove_map(memory_limit);
Ard Biesheuvela7f8de12016-02-16 13:52:42 +0100228 memblock_add(__pa(_text), (u64)(_end - _text));
229 }
Mark Rutland6083fe742015-01-15 16:42:14 +0000230
Ard Biesheuvel177e15f2016-03-30 15:18:42 +0200231 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
Ard Biesheuvelc031a422016-01-29 11:59:03 +0100260 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 }
Catalin Marinas2d5a5612014-06-13 13:41:20 +0100276
Mark Rutlandbd00cd52014-06-24 16:51:35 +0100277 /*
278 * Register the kernel text, kernel data, initrd, and initial
279 * pagetables with memblock.
280 */
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000281 memblock_reserve(__pa(_text), _end - _text);
282#ifdef CONFIG_BLK_DEV_INITRD
Ard Biesheuvela89dea52016-02-16 13:52:41 +0100283 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 }
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000290#endif
291
Mark Salter0ceac9e2014-09-08 13:01:08 -0400292 early_init_fdt_scan_reserved_mem();
Catalin Marinas2d5a5612014-06-13 13:41:20 +0100293
294 /* 4GB maximum for 32-bit only capable devices */
295 if (IS_ENABLED(CONFIG_ZONE_DMA))
Catalin Marinasa1e50a82015-02-05 18:01:53 +0000296 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);
Laura Abbott6ac21042013-12-12 19:28:33 +0000300
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000301 memblock_allow_resize();
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000302}
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
Vladimir Murzin36dd9082015-04-14 15:48:33 -0700311 early_memtest(min << PAGE_SHIFT, max << PAGE_SHIFT);
312
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700313 max_pfn = max_low_pfn = max;
314
315 arm64_numa_init();
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000316 /*
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;
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700326 memblock_dump_all();
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000327}
328
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000329#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 */
Dave P Martinb9bcc912015-06-16 17:38:47 +0100386 prev_end = ALIGN(__phys_to_pfn(reg->base + reg->size),
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000387 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{
Jisheng Zhangb67a8b22016-06-08 15:53:46 +0800404 if (swiotlb_force || max_pfn > (arm64_dma_phys_limit >> PAGE_SHIFT))
405 swiotlb_init(1);
Catalin Marinasa1e50a82015-02-05 18:01:53 +0000406
Ganapatrao Kulkarnia6583c72014-09-16 18:53:54 +0100407 set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000408
409#ifndef CONFIG_SPARSEMEM_VMEMMAP
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000410 free_unused_memmap();
411#endif
Jiang Liubee4ebd2013-07-03 15:03:49 -0700412 /* this will put all unused low memory onto the freelists */
Jiang Liu0c988532013-07-03 15:03:24 -0700413 free_all_bootmem();
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000414
Jiang Liu6879ea82013-07-03 15:04:02 -0700415 mem_init_print_info(NULL);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000416
417#define MLK(b, t) b, t, ((t) - (b)) >> 10
418#define MLM(b, t) b, t, ((t) - (b)) >> 20
Catalin Marinas08375192014-07-16 17:42:43 +0100419#define MLG(b, t) b, t, ((t) - (b)) >> 30
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000420#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
421
Catalin Marinasf09f1ba2016-03-11 17:39:25 +0000422 pr_notice("Virtual kernel memory layout:\n");
Linus Walleijee7f8812015-10-12 18:52:59 +0300423#ifdef CONFIG_KASAN
Catalin Marinasf09f1ba2016-03-11 17:39:25 +0000424 pr_cont(" kasan : 0x%16lx - 0x%16lx (%6ld GB)\n",
425 MLG(KASAN_SHADOW_START, KASAN_SHADOW_END));
Linus Walleijee7f8812015-10-12 18:52:59 +0300426#endif
Catalin Marinasf09f1ba2016-03-11 17:39:25 +0000427 pr_cont(" modules : 0x%16lx - 0x%16lx (%6ld MB)\n",
428 MLM(MODULES_VADDR, MODULES_END));
429 pr_cont(" vmalloc : 0x%16lx - 0x%16lx (%6ld GB)\n",
430 MLG(VMALLOC_START, VMALLOC_END));
Kefeng Wangd32351c2016-04-18 11:09:46 +0800431 pr_cont(" .text : 0x%p" " - 0x%p" " (%6ld KB)\n",
Ard Biesheuvel9fdc14c52016-06-23 15:53:17 +0200432 MLK_ROUNDUP(_text, _etext));
Kefeng Wangd32351c2016-04-18 11:09:46 +0800433 pr_cont(" .rodata : 0x%p" " - 0x%p" " (%6ld KB)\n",
Ard Biesheuvel9fdc14c52016-06-23 15:53:17 +0200434 MLK_ROUNDUP(__start_rodata, __init_begin));
Kefeng Wangd32351c2016-04-18 11:09:46 +0800435 pr_cont(" .init : 0x%p" " - 0x%p" " (%6ld KB)\n",
436 MLK_ROUNDUP(__init_begin, __init_end));
437 pr_cont(" .data : 0x%p" " - 0x%p" " (%6ld KB)\n",
Catalin Marinasf09f1ba2016-03-11 17:39:25 +0000438 MLK_ROUNDUP(_sdata, _edata));
Kefeng Wang99747232016-04-18 11:09:47 +0800439 pr_cont(" .bss : 0x%p" " - 0x%p" " (%6ld KB)\n",
440 MLK_ROUNDUP(__bss_start, __bss_stop));
Ard Biesheuvel3e1907d2016-03-30 16:46:00 +0200441 pr_cont(" fixed : 0x%16lx - 0x%16lx (%6ld KB)\n",
442 MLK(FIXADDR_START, FIXADDR_TOP));
443 pr_cont(" PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n",
444 MLM(PCI_IO_START, PCI_IO_END));
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000445#ifdef CONFIG_SPARSEMEM_VMEMMAP
Kefeng Wangd32351c2016-04-18 11:09:46 +0800446 pr_cont(" vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n",
447 MLG(VMEMMAP_START, VMEMMAP_START + VMEMMAP_SIZE));
448 pr_cont(" 0x%16lx - 0x%16lx (%6ld MB actual)\n",
Catalin Marinasf09f1ba2016-03-11 17:39:25 +0000449 MLM((unsigned long)phys_to_page(memblock_start_of_DRAM()),
450 (unsigned long)virt_to_page(high_memory)));
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000451#endif
Catalin Marinasf09f1ba2016-03-11 17:39:25 +0000452 pr_cont(" memory : 0x%16lx - 0x%16lx (%6ld MB)\n",
453 MLM(__phys_to_virt(memblock_start_of_DRAM()),
454 (unsigned long)high_memory));
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000455
456#undef MLK
457#undef MLM
458#undef MLK_ROUNDUP
459
460 /*
461 * Check boundaries twice: Some fundamental inconsistencies can be
462 * detected at build time already.
463 */
464#ifdef CONFIG_COMPAT
465 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
466#endif
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000467
Ard Biesheuvel3e1907d2016-03-30 16:46:00 +0200468 /*
469 * Make sure we chose the upper bound of sizeof(struct page)
470 * correctly.
471 */
472 BUILD_BUG_ON(sizeof(struct page) > (1 << STRUCT_PAGE_MAX_SHIFT));
473
Jiang Liubee4ebd2013-07-03 15:03:49 -0700474 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000475 extern int sysctl_overcommit_memory;
476 /*
477 * On a machine this small we won't get anywhere without
478 * overcommit, so turn it on by default.
479 */
480 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
481 }
482}
483
484void free_initmem(void)
485{
Ard Biesheuveld3868252016-03-30 16:45:57 +0200486 free_reserved_area(__va(__pa(__init_begin)), __va(__pa(__init_end)),
487 0, "unused kernel");
Ard Biesheuvelf9040772016-02-16 13:52:40 +0100488 fixup_init();
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000489}
490
491#ifdef CONFIG_BLK_DEV_INITRD
492
Wang Long662ba3d2015-07-27 03:32:53 +0100493static int keep_initrd __initdata;
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000494
Wang Long662ba3d2015-07-27 03:32:53 +0100495void __init free_initrd_mem(unsigned long start, unsigned long end)
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000496{
Catalin Marinas01450582015-01-16 13:56:38 +0000497 if (!keep_initrd)
Jiang Liu9af5b802013-07-03 15:02:54 -0700498 free_reserved_area((void *)start, (void *)end, 0, "initrd");
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000499}
500
501static int __init keepinitrd_setup(char *__unused)
502{
503 keep_initrd = 1;
504 return 1;
505}
506
507__setup("keepinitrd", keepinitrd_setup);
508#endif
Ard Biesheuvela7f8de12016-02-16 13:52:42 +0100509
510/*
511 * Dump out memory limit information on panic.
512 */
513static int dump_mem_limit(struct notifier_block *self, unsigned long v, void *p)
514{
515 if (memory_limit != (phys_addr_t)ULLONG_MAX) {
516 pr_emerg("Memory Limit: %llu MB\n", memory_limit >> 20);
517 } else {
518 pr_emerg("Memory Limit: none\n");
519 }
520 return 0;
521}
522
523static struct notifier_block mem_limit_notifier = {
524 .notifier_call = dump_mem_limit,
525};
526
527static int __init register_mem_limit_dumper(void)
528{
529 atomic_notifier_chain_register(&panic_notifier_list,
530 &mem_limit_notifier);
531 return 0;
532}
533__initcall(register_mem_limit_dumper);