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c1cc1552 CM |
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> | |
5a9e3e15 | 26 | #include <linux/cache.h> |
c1cc1552 CM |
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> | |
19e7640d | 34 | #include <linux/dma-mapping.h> |
6ac2104d | 35 | #include <linux/dma-contiguous.h> |
86c8b27a | 36 | #include <linux/efi.h> |
a1e50a82 | 37 | #include <linux/swiotlb.h> |
dae8c235 | 38 | #include <linux/vmalloc.h> |
c1cc1552 | 39 | |
a7f8de16 | 40 | #include <asm/boot.h> |
08375198 | 41 | #include <asm/fixmap.h> |
f9040773 | 42 | #include <asm/kasan.h> |
a7f8de16 | 43 | #include <asm/kernel-pgtable.h> |
aa03c428 | 44 | #include <asm/memory.h> |
1a2db300 | 45 | #include <asm/numa.h> |
c1cc1552 CM |
46 | #include <asm/sections.h> |
47 | #include <asm/setup.h> | |
48 | #include <asm/sizes.h> | |
49 | #include <asm/tlb.h> | |
e039ee4e | 50 | #include <asm/alternative.h> |
c1cc1552 | 51 | |
a7f8de16 AB |
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 | */ | |
5a9e3e15 JZ |
58 | s64 memstart_addr __ro_after_init = -1; |
59 | phys_addr_t arm64_dma_phys_limit __ro_after_init; | |
c1cc1552 | 60 | |
ec2eaa73 | 61 | #ifdef CONFIG_BLK_DEV_INITRD |
c1cc1552 CM |
62 | static 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 | ||
a89dea58 AB |
71 | initrd_start = start; |
72 | initrd_end = start + size; | |
c1cc1552 CM |
73 | } |
74 | return 0; | |
75 | } | |
76 | early_param("initrd", early_initrd); | |
ec2eaa73 | 77 | #endif |
c1cc1552 | 78 | |
d50314a6 CM |
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 | */ | |
a7c61a34 | 84 | static phys_addr_t __init max_zone_dma_phys(void) |
d50314a6 CM |
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 | ||
1a2db300 GK |
90 | #ifdef CONFIG_NUMA |
91 | ||
92 | static 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 | ||
c1cc1552 CM |
105 | static 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]; | |
19e7640d | 109 | unsigned long max_dma = min; |
c1cc1552 CM |
110 | |
111 | memset(zone_size, 0, sizeof(zone_size)); | |
112 | ||
c1cc1552 | 113 | /* 4GB maximum for 32-bit only capable devices */ |
86a5906e RM |
114 | #ifdef CONFIG_ZONE_DMA |
115 | max_dma = PFN_DOWN(arm64_dma_phys_limit); | |
116 | zone_size[ZONE_DMA] = max_dma - min; | |
117 | #endif | |
19e7640d | 118 | zone_size[ZONE_NORMAL] = max - max_dma; |
c1cc1552 CM |
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; | |
19e7640d | 128 | |
86a5906e RM |
129 | #ifdef CONFIG_ZONE_DMA |
130 | if (start < max_dma) { | |
19e7640d CM |
131 | unsigned long dma_end = min(end, max_dma); |
132 | zhole_size[ZONE_DMA] -= dma_end - start; | |
c1cc1552 | 133 | } |
86a5906e | 134 | #endif |
19e7640d | 135 | if (end > max_dma) { |
c1cc1552 | 136 | unsigned long normal_end = min(end, max); |
19e7640d | 137 | unsigned long normal_start = max(start, max_dma); |
c1cc1552 CM |
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 | ||
1a2db300 GK |
145 | #endif /* CONFIG_NUMA */ |
146 | ||
c1cc1552 CM |
147 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
148 | int pfn_valid(unsigned long pfn) | |
149 | { | |
68709f45 | 150 | return memblock_is_map_memory(pfn << PAGE_SHIFT); |
c1cc1552 CM |
151 | } |
152 | EXPORT_SYMBOL(pfn_valid); | |
153 | #endif | |
154 | ||
155 | #ifndef CONFIG_SPARSEMEM | |
a7c61a34 | 156 | static void __init arm64_memory_present(void) |
c1cc1552 CM |
157 | { |
158 | } | |
159 | #else | |
a7c61a34 | 160 | static void __init arm64_memory_present(void) |
c1cc1552 CM |
161 | { |
162 | struct memblock_region *reg; | |
163 | ||
1a2db300 | 164 | for_each_memblock(memory, reg) { |
ea2cbee3 MR |
165 | int nid = memblock_get_region_node(reg); |
166 | ||
1a2db300 GK |
167 | memory_present(nid, memblock_region_memory_base_pfn(reg), |
168 | memblock_region_memory_end_pfn(reg)); | |
169 | } | |
c1cc1552 CM |
170 | } |
171 | #endif | |
172 | ||
6083fe74 MR |
173 | static phys_addr_t memory_limit = (phys_addr_t)ULLONG_MAX; |
174 | ||
175 | /* | |
176 | * Limit the memory size that was specified via FDT. | |
177 | */ | |
178 | static 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 | } | |
188 | early_param("mem", early_mem); | |
189 | ||
c1cc1552 CM |
190 | void __init arm64_memblock_init(void) |
191 | { | |
a7f8de16 AB |
192 | const s64 linear_region_size = -(s64)PAGE_OFFSET; |
193 | ||
6d2aa549 AB |
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 | ||
a7f8de16 AB |
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 | */ | |
020d044f | 212 | memblock_remove(max_t(u64, memstart_addr + linear_region_size, __pa(_end)), |
a7f8de16 | 213 | ULLONG_MAX); |
2958987f AB |
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 | } | |
a7f8de16 AB |
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) { | |
cb0a6502 | 227 | memblock_mem_limit_remove_map(memory_limit); |
a7f8de16 AB |
228 | memblock_add(__pa(_text), (u64)(_end - _text)); |
229 | } | |
6083fe74 | 230 | |
177e15f0 AB |
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 | ||
c031a421 AB |
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 | } | |
6083fe74 | 276 | |
bd00cd5f MR |
277 | /* |
278 | * Register the kernel text, kernel data, initrd, and initial | |
279 | * pagetables with memblock. | |
280 | */ | |
c1cc1552 CM |
281 | memblock_reserve(__pa(_text), _end - _text); |
282 | #ifdef CONFIG_BLK_DEV_INITRD | |
a89dea58 AB |
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 | } | |
c1cc1552 CM |
290 | #endif |
291 | ||
0ceac9e0 | 292 | early_init_fdt_scan_reserved_mem(); |
2d5a5612 CM |
293 | |
294 | /* 4GB maximum for 32-bit only capable devices */ | |
295 | if (IS_ENABLED(CONFIG_ZONE_DMA)) | |
a1e50a82 CM |
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); | |
6ac2104d | 300 | |
c1cc1552 | 301 | memblock_allow_resize(); |
c1cc1552 CM |
302 | } |
303 | ||
304 | void __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 | ||
36dd9086 VM |
311 | early_memtest(min << PAGE_SHIFT, max << PAGE_SHIFT); |
312 | ||
1a2db300 GK |
313 | max_pfn = max_low_pfn = max; |
314 | ||
315 | arm64_numa_init(); | |
c1cc1552 CM |
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; | |
1a2db300 | 326 | memblock_dump_all(); |
c1cc1552 CM |
327 | } |
328 | ||
c1cc1552 CM |
329 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
330 | static 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 | */ | |
359 | static 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 | */ | |
b9bcc919 | 386 | prev_end = ALIGN(__phys_to_pfn(reg->base + reg->size), |
c1cc1552 CM |
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 | */ | |
402 | void __init mem_init(void) | |
403 | { | |
b67a8b29 JZ |
404 | if (swiotlb_force || max_pfn > (arm64_dma_phys_limit >> PAGE_SHIFT)) |
405 | swiotlb_init(1); | |
a1e50a82 | 406 | |
a6583c7c | 407 | set_max_mapnr(pfn_to_page(max_pfn) - mem_map); |
c1cc1552 CM |
408 | |
409 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
c1cc1552 CM |
410 | free_unused_memmap(); |
411 | #endif | |
bee4ebd1 | 412 | /* this will put all unused low memory onto the freelists */ |
0c988534 | 413 | free_all_bootmem(); |
c1cc1552 | 414 | |
6879ea83 | 415 | mem_init_print_info(NULL); |
c1cc1552 CM |
416 | |
417 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 | |
418 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
08375198 | 419 | #define MLG(b, t) b, t, ((t) - (b)) >> 30 |
c1cc1552 CM |
420 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) |
421 | ||
f09f1bac | 422 | pr_notice("Virtual kernel memory layout:\n"); |
ee7f881b | 423 | #ifdef CONFIG_KASAN |
f09f1bac CM |
424 | pr_cont(" kasan : 0x%16lx - 0x%16lx (%6ld GB)\n", |
425 | MLG(KASAN_SHADOW_START, KASAN_SHADOW_END)); | |
ee7f881b | 426 | #endif |
f09f1bac CM |
427 | 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)); | |
d32351c8 | 431 | pr_cont(" .text : 0x%p" " - 0x%p" " (%6ld KB)\n", |
9fdc14c5 | 432 | MLK_ROUNDUP(_text, _etext)); |
d32351c8 | 433 | pr_cont(" .rodata : 0x%p" " - 0x%p" " (%6ld KB)\n", |
9fdc14c5 | 434 | MLK_ROUNDUP(__start_rodata, __init_begin)); |
d32351c8 KW |
435 | 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", | |
f09f1bac | 438 | MLK_ROUNDUP(_sdata, _edata)); |
9974723e KW |
439 | pr_cont(" .bss : 0x%p" " - 0x%p" " (%6ld KB)\n", |
440 | MLK_ROUNDUP(__bss_start, __bss_stop)); | |
3e1907d5 AB |
441 | 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)); | |
c1cc1552 | 445 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
d32351c8 KW |
446 | 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", | |
f09f1bac CM |
449 | MLM((unsigned long)phys_to_page(memblock_start_of_DRAM()), |
450 | (unsigned long)virt_to_page(high_memory))); | |
c1cc1552 | 451 | #endif |
f09f1bac CM |
452 | pr_cont(" memory : 0x%16lx - 0x%16lx (%6ld MB)\n", |
453 | MLM(__phys_to_virt(memblock_start_of_DRAM()), | |
454 | (unsigned long)high_memory)); | |
c1cc1552 CM |
455 | |
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 | |
c1cc1552 | 467 | |
3e1907d5 AB |
468 | /* |
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 | ||
bee4ebd1 | 474 | if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { |
c1cc1552 CM |
475 | 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 | ||
484 | void free_initmem(void) | |
485 | { | |
d386825c AB |
486 | free_reserved_area(__va(__pa(__init_begin)), __va(__pa(__init_end)), |
487 | 0, "unused kernel"); | |
dae8c235 KW |
488 | /* |
489 | * Unmap the __init region but leave the VM area in place. This | |
490 | * prevents the region from being reused for kernel modules, which | |
491 | * is not supported by kallsyms. | |
492 | */ | |
493 | unmap_kernel_range((u64)__init_begin, (u64)(__init_end - __init_begin)); | |
c1cc1552 CM |
494 | } |
495 | ||
496 | #ifdef CONFIG_BLK_DEV_INITRD | |
497 | ||
662ba3db | 498 | static int keep_initrd __initdata; |
c1cc1552 | 499 | |
662ba3db | 500 | void __init free_initrd_mem(unsigned long start, unsigned long end) |
c1cc1552 | 501 | { |
0145058c | 502 | if (!keep_initrd) |
9af5b807 | 503 | free_reserved_area((void *)start, (void *)end, 0, "initrd"); |
c1cc1552 CM |
504 | } |
505 | ||
506 | static int __init keepinitrd_setup(char *__unused) | |
507 | { | |
508 | keep_initrd = 1; | |
509 | return 1; | |
510 | } | |
511 | ||
512 | __setup("keepinitrd", keepinitrd_setup); | |
513 | #endif | |
a7f8de16 AB |
514 | |
515 | /* | |
516 | * Dump out memory limit information on panic. | |
517 | */ | |
518 | static int dump_mem_limit(struct notifier_block *self, unsigned long v, void *p) | |
519 | { | |
520 | if (memory_limit != (phys_addr_t)ULLONG_MAX) { | |
521 | pr_emerg("Memory Limit: %llu MB\n", memory_limit >> 20); | |
522 | } else { | |
523 | pr_emerg("Memory Limit: none\n"); | |
524 | } | |
525 | return 0; | |
526 | } | |
527 | ||
528 | static struct notifier_block mem_limit_notifier = { | |
529 | .notifier_call = dump_mem_limit, | |
530 | }; | |
531 | ||
532 | static int __init register_mem_limit_dumper(void) | |
533 | { | |
534 | atomic_notifier_chain_register(&panic_notifier_list, | |
535 | &mem_limit_notifier); | |
536 | return 0; | |
537 | } | |
538 | __initcall(register_mem_limit_dumper); |