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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/mm/init.c | |
3 | * | |
90072059 | 4 | * Copyright (C) 1995-2005 Russell King |
1da177e4 LT |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
1da177e4 LT |
10 | #include <linux/kernel.h> |
11 | #include <linux/errno.h> | |
1da177e4 LT |
12 | #include <linux/swap.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/bootmem.h> | |
15 | #include <linux/mman.h> | |
3f07c014 | 16 | #include <linux/sched/signal.h> |
29930025 | 17 | #include <linux/sched/task.h> |
dc28094b | 18 | #include <linux/export.h> |
1da177e4 LT |
19 | #include <linux/nodemask.h> |
20 | #include <linux/initrd.h> | |
9eb8f674 | 21 | #include <linux/of_fdt.h> |
3835f6cb | 22 | #include <linux/highmem.h> |
5a0e3ad6 | 23 | #include <linux/gfp.h> |
2778f620 | 24 | #include <linux/memblock.h> |
c7909509 | 25 | #include <linux/dma-contiguous.h> |
158e8bfe | 26 | #include <linux/sizes.h> |
08925c2f | 27 | #include <linux/stop_machine.h> |
1da177e4 | 28 | |
b4b20ad8 | 29 | #include <asm/cp15.h> |
1da177e4 | 30 | #include <asm/mach-types.h> |
716a3dc2 | 31 | #include <asm/memblock.h> |
d2ca5f24 | 32 | #include <asm/memory.h> |
93c02ab4 | 33 | #include <asm/prom.h> |
37efe642 | 34 | #include <asm/sections.h> |
1da177e4 | 35 | #include <asm/setup.h> |
1e6b4811 | 36 | #include <asm/system_info.h> |
1da177e4 | 37 | #include <asm/tlb.h> |
db9ef1af | 38 | #include <asm/fixmap.h> |
1da177e4 LT |
39 | |
40 | #include <asm/mach/arch.h> | |
41 | #include <asm/mach/map.h> | |
42 | ||
1b2e2b73 RK |
43 | #include "mm.h" |
44 | ||
b4b20ad8 RK |
45 | #ifdef CONFIG_CPU_CP15_MMU |
46 | unsigned long __init __clear_cr(unsigned long mask) | |
47 | { | |
b4b20ad8 RK |
48 | cr_alignment = cr_alignment & ~mask; |
49 | return cr_alignment; | |
50 | } | |
51 | #endif | |
52 | ||
de22cc6e | 53 | static phys_addr_t phys_initrd_start __initdata = 0; |
012d1f4a RK |
54 | static unsigned long phys_initrd_size __initdata = 0; |
55 | ||
2b0d8c25 | 56 | static int __init early_initrd(char *p) |
012d1f4a | 57 | { |
de22cc6e VA |
58 | phys_addr_t start; |
59 | unsigned long size; | |
2b0d8c25 | 60 | char *endp; |
012d1f4a | 61 | |
2b0d8c25 JK |
62 | start = memparse(p, &endp); |
63 | if (*endp == ',') { | |
64 | size = memparse(endp + 1, NULL); | |
012d1f4a RK |
65 | |
66 | phys_initrd_start = start; | |
67 | phys_initrd_size = size; | |
68 | } | |
2b0d8c25 | 69 | return 0; |
012d1f4a | 70 | } |
2b0d8c25 | 71 | early_param("initrd", early_initrd); |
012d1f4a RK |
72 | |
73 | static int __init parse_tag_initrd(const struct tag *tag) | |
74 | { | |
4ed89f22 | 75 | pr_warn("ATAG_INITRD is deprecated; " |
012d1f4a RK |
76 | "please update your bootloader.\n"); |
77 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); | |
78 | phys_initrd_size = tag->u.initrd.size; | |
79 | return 0; | |
80 | } | |
81 | ||
82 | __tagtable(ATAG_INITRD, parse_tag_initrd); | |
83 | ||
84 | static int __init parse_tag_initrd2(const struct tag *tag) | |
85 | { | |
86 | phys_initrd_start = tag->u.initrd.start; | |
87 | phys_initrd_size = tag->u.initrd.size; | |
88 | return 0; | |
89 | } | |
90 | ||
91 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); | |
1da177e4 | 92 | |
f25b4b4c | 93 | static void __init find_limits(unsigned long *min, unsigned long *max_low, |
27a3f0e9 | 94 | unsigned long *max_high) |
dde5828f | 95 | { |
1c2f87c2 LA |
96 | *max_low = PFN_DOWN(memblock_get_current_limit()); |
97 | *min = PFN_UP(memblock_start_of_DRAM()); | |
98 | *max_high = PFN_DOWN(memblock_end_of_DRAM()); | |
dde5828f RK |
99 | } |
100 | ||
be20902b | 101 | #ifdef CONFIG_ZONE_DMA |
65032018 | 102 | |
364230b9 | 103 | phys_addr_t arm_dma_zone_size __read_mostly; |
65032018 NP |
104 | EXPORT_SYMBOL(arm_dma_zone_size); |
105 | ||
022ae537 RK |
106 | /* |
107 | * The DMA mask corresponding to the maximum bus address allocatable | |
108 | * using GFP_DMA. The default here places no restriction on DMA | |
109 | * allocations. This must be the smallest DMA mask in the system, | |
110 | * so a successful GFP_DMA allocation will always satisfy this. | |
111 | */ | |
4986e5c7 | 112 | phys_addr_t arm_dma_limit; |
4dcfa600 | 113 | unsigned long arm_dma_pfn_limit; |
022ae537 | 114 | |
be20902b RK |
115 | static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, |
116 | unsigned long dma_size) | |
117 | { | |
118 | if (size[0] <= dma_size) | |
119 | return; | |
120 | ||
121 | size[ZONE_NORMAL] = size[0] - dma_size; | |
122 | size[ZONE_DMA] = dma_size; | |
123 | hole[ZONE_NORMAL] = hole[0]; | |
124 | hole[ZONE_DMA] = 0; | |
125 | } | |
126 | #endif | |
127 | ||
ff69a4c8 | 128 | void __init setup_dma_zone(const struct machine_desc *mdesc) |
c7909509 MS |
129 | { |
130 | #ifdef CONFIG_ZONE_DMA | |
131 | if (mdesc->dma_zone_size) { | |
132 | arm_dma_zone_size = mdesc->dma_zone_size; | |
6bcac805 | 133 | arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; |
c7909509 MS |
134 | } else |
135 | arm_dma_limit = 0xffffffff; | |
4dcfa600 | 136 | arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT; |
c7909509 MS |
137 | #endif |
138 | } | |
139 | ||
84f452b1 | 140 | static void __init zone_sizes_init(unsigned long min, unsigned long max_low, |
a2c54d2a | 141 | unsigned long max_high) |
b7a69ac3 RK |
142 | { |
143 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
a2c54d2a | 144 | struct memblock_region *reg; |
b7a69ac3 | 145 | |
90072059 | 146 | /* |
be370302 | 147 | * initialise the zones. |
90072059 RK |
148 | */ |
149 | memset(zone_size, 0, sizeof(zone_size)); | |
90072059 RK |
150 | |
151 | /* | |
be370302 RK |
152 | * The memory size has already been determined. If we need |
153 | * to do anything fancy with the allocation of this memory | |
154 | * to the zones, now is the time to do it. | |
90072059 | 155 | */ |
dde5828f RK |
156 | zone_size[0] = max_low - min; |
157 | #ifdef CONFIG_HIGHMEM | |
158 | zone_size[ZONE_HIGHMEM] = max_high - max_low; | |
159 | #endif | |
90072059 RK |
160 | |
161 | /* | |
be370302 RK |
162 | * Calculate the size of the holes. |
163 | * holes = node_size - sum(bank_sizes) | |
90072059 | 164 | */ |
dde5828f | 165 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
a2c54d2a RK |
166 | for_each_memblock(memory, reg) { |
167 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
168 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
169 | ||
170 | if (start < max_low) { | |
171 | unsigned long low_end = min(end, max_low); | |
172 | zhole_size[0] -= low_end - start; | |
173 | } | |
dde5828f | 174 | #ifdef CONFIG_HIGHMEM |
a2c54d2a RK |
175 | if (end > max_low) { |
176 | unsigned long high_start = max(start, max_low); | |
177 | zhole_size[ZONE_HIGHMEM] -= end - high_start; | |
178 | } | |
dde5828f | 179 | #endif |
dde5828f | 180 | } |
90072059 | 181 | |
65032018 | 182 | #ifdef CONFIG_ZONE_DMA |
90072059 RK |
183 | /* |
184 | * Adjust the sizes according to any special requirements for | |
185 | * this machine type. | |
186 | */ | |
c7909509 | 187 | if (arm_dma_zone_size) |
65032018 NP |
188 | arm_adjust_dma_zone(zone_size, zhole_size, |
189 | arm_dma_zone_size >> PAGE_SHIFT); | |
be20902b | 190 | #endif |
90072059 | 191 | |
be370302 | 192 | free_area_init_node(0, zone_size, min, zhole_size); |
1da177e4 LT |
193 | } |
194 | ||
7b7bf499 | 195 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
b7cfda9f RK |
196 | int pfn_valid(unsigned long pfn) |
197 | { | |
09414d00 | 198 | return memblock_is_map_memory(__pfn_to_phys(pfn)); |
b7cfda9f RK |
199 | } |
200 | EXPORT_SYMBOL(pfn_valid); | |
7b7bf499 | 201 | #endif |
657e12fd | 202 | |
7b7bf499 | 203 | #ifndef CONFIG_SPARSEMEM |
14904927 | 204 | static void __init arm_memory_present(void) |
657e12fd RK |
205 | { |
206 | } | |
207 | #else | |
14904927 | 208 | static void __init arm_memory_present(void) |
657e12fd | 209 | { |
719c1514 | 210 | struct memblock_region *reg; |
719c1514 | 211 | |
7c996361 | 212 | for_each_memblock(memory, reg) |
c7fc2de0 YL |
213 | memory_present(0, memblock_region_memory_base_pfn(reg), |
214 | memblock_region_memory_end_pfn(reg)); | |
657e12fd | 215 | } |
b7cfda9f RK |
216 | #endif |
217 | ||
716a3dc2 RK |
218 | static bool arm_memblock_steal_permitted = true; |
219 | ||
bc2827d0 | 220 | phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) |
716a3dc2 RK |
221 | { |
222 | phys_addr_t phys; | |
223 | ||
224 | BUG_ON(!arm_memblock_steal_permitted); | |
225 | ||
7ac68a4c | 226 | phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); |
716a3dc2 RK |
227 | memblock_free(phys, size); |
228 | memblock_remove(phys, size); | |
229 | ||
230 | return phys; | |
231 | } | |
232 | ||
39286248 | 233 | static void __init arm_initrd_init(void) |
2778f620 | 234 | { |
2778f620 | 235 | #ifdef CONFIG_BLK_DEV_INITRD |
cdcc5fa0 RK |
236 | phys_addr_t start; |
237 | unsigned long size; | |
238 | ||
65939301 | 239 | /* FDT scan will populate initrd_start */ |
4c235cb9 | 240 | if (initrd_start && !phys_initrd_size) { |
65939301 RH |
241 | phys_initrd_start = __virt_to_phys(initrd_start); |
242 | phys_initrd_size = initrd_end - initrd_start; | |
243 | } | |
68b32f36 | 244 | |
4c235cb9 | 245 | initrd_start = initrd_end = 0; |
68b32f36 RK |
246 | |
247 | if (!phys_initrd_size) | |
248 | return; | |
249 | ||
cdcc5fa0 RK |
250 | /* |
251 | * Round the memory region to page boundaries as per free_initrd_mem() | |
252 | * This allows us to detect whether the pages overlapping the initrd | |
253 | * are in use, but more importantly, reserves the entire set of pages | |
254 | * as we don't want these pages allocated for other purposes. | |
255 | */ | |
256 | start = round_down(phys_initrd_start, PAGE_SIZE); | |
257 | size = phys_initrd_size + (phys_initrd_start - start); | |
258 | size = round_up(size, PAGE_SIZE); | |
259 | ||
260 | if (!memblock_is_region_memory(start, size)) { | |
de22cc6e | 261 | pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", |
cdcc5fa0 | 262 | (u64)start, size); |
68b32f36 | 263 | return; |
8f4b8c76 | 264 | } |
68b32f36 | 265 | |
cdcc5fa0 | 266 | if (memblock_is_region_reserved(start, size)) { |
de22cc6e | 267 | pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", |
cdcc5fa0 | 268 | (u64)start, size); |
68b32f36 | 269 | return; |
b0a2679d | 270 | } |
2778f620 | 271 | |
cdcc5fa0 | 272 | memblock_reserve(start, size); |
68b32f36 RK |
273 | |
274 | /* Now convert initrd to virtual addresses */ | |
275 | initrd_start = __phys_to_virt(phys_initrd_start); | |
276 | initrd_end = initrd_start + phys_initrd_size; | |
2778f620 | 277 | #endif |
39286248 RK |
278 | } |
279 | ||
280 | void __init arm_memblock_init(const struct machine_desc *mdesc) | |
281 | { | |
282 | /* Register the kernel text, kernel data and initrd with memblock. */ | |
283 | memblock_reserve(__pa(KERNEL_START), KERNEL_END - KERNEL_START); | |
284 | ||
285 | arm_initrd_init(); | |
2778f620 RK |
286 | |
287 | arm_mm_memblock_reserve(); | |
288 | ||
8d717a52 RK |
289 | /* reserve any platform specific memblock areas */ |
290 | if (mdesc->reserve) | |
291 | mdesc->reserve(); | |
292 | ||
24bbd929 | 293 | early_init_fdt_reserve_self(); |
bcedb5f9 MS |
294 | early_init_fdt_scan_reserved_mem(); |
295 | ||
99a468d7 | 296 | /* reserve memory for DMA contiguous allocations */ |
95b0e655 | 297 | dma_contiguous_reserve(arm_dma_limit); |
c7909509 | 298 | |
716a3dc2 | 299 | arm_memblock_steal_permitted = false; |
2778f620 RK |
300 | memblock_dump_all(); |
301 | } | |
302 | ||
8d717a52 | 303 | void __init bootmem_init(void) |
1da177e4 | 304 | { |
dde5828f | 305 | unsigned long min, max_low, max_high; |
1da177e4 | 306 | |
8e58caef | 307 | memblock_allow_resize(); |
dde5828f RK |
308 | max_low = max_high = 0; |
309 | ||
f25b4b4c | 310 | find_limits(&min, &max_low, &max_high); |
dde5828f | 311 | |
d30eae47 VM |
312 | early_memtest((phys_addr_t)min << PAGE_SHIFT, |
313 | (phys_addr_t)max_low << PAGE_SHIFT); | |
314 | ||
be370302 RK |
315 | /* |
316 | * Sparsemem tries to allocate bootmem in memory_present(), | |
317 | * so must be done after the fixed reservations | |
318 | */ | |
eda2e5dc | 319 | arm_memory_present(); |
1da177e4 | 320 | |
b7a69ac3 RK |
321 | /* |
322 | * sparse_init() needs the bootmem allocator up and running. | |
323 | */ | |
324 | sparse_init(); | |
325 | ||
326 | /* | |
be370302 | 327 | * Now free the memory - free_area_init_node needs |
b7a69ac3 RK |
328 | * the sparse mem_map arrays initialized by sparse_init() |
329 | * for memmap_init_zone(), otherwise all PFNs are invalid. | |
330 | */ | |
84f452b1 | 331 | zone_sizes_init(min, max_low, max_high); |
b7a69ac3 | 332 | |
90072059 RK |
333 | /* |
334 | * This doesn't seem to be used by the Linux memory manager any | |
335 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
336 | * also get rid of some of the stuff above as well. | |
90072059 | 337 | */ |
26ba47b1 SS |
338 | min_low_pfn = min; |
339 | max_low_pfn = max_low; | |
340 | max_pfn = max_high; | |
90072059 | 341 | } |
1da177e4 | 342 | |
54d52573 SB |
343 | /* |
344 | * Poison init memory with an undefined instruction (ARM) or a branch to an | |
345 | * undefined instruction (Thumb). | |
346 | */ | |
347 | static inline void poison_init_mem(void *s, size_t count) | |
348 | { | |
349 | u32 *p = (u32 *)s; | |
bf912d99 | 350 | for (; count != 0; count -= 4) |
54d52573 SB |
351 | *p++ = 0xe7fddef0; |
352 | } | |
353 | ||
a013053d | 354 | static inline void |
be370302 | 355 | free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
a013053d RK |
356 | { |
357 | struct page *start_pg, *end_pg; | |
56bc6286 | 358 | phys_addr_t pg, pgend; |
a013053d RK |
359 | |
360 | /* | |
361 | * Convert start_pfn/end_pfn to a struct page pointer. | |
362 | */ | |
3257f43d | 363 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
9af386c8 | 364 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
a013053d RK |
365 | |
366 | /* | |
367 | * Convert to physical addresses, and | |
368 | * round start upwards and end downwards. | |
369 | */ | |
56bc6286 VA |
370 | pg = PAGE_ALIGN(__pa(start_pg)); |
371 | pgend = __pa(end_pg) & PAGE_MASK; | |
a013053d RK |
372 | |
373 | /* | |
374 | * If there are free pages between these, | |
375 | * free the section of the memmap array. | |
376 | */ | |
377 | if (pg < pgend) | |
cfb66586 | 378 | memblock_free_early(pg, pgend - pg); |
a013053d RK |
379 | } |
380 | ||
381 | /* | |
382 | * The mem_map array can get very big. Free the unused area of the memory map. | |
383 | */ | |
1c2f87c2 | 384 | static void __init free_unused_memmap(void) |
a013053d | 385 | { |
1c2f87c2 LA |
386 | unsigned long start, prev_end = 0; |
387 | struct memblock_region *reg; | |
a013053d RK |
388 | |
389 | /* | |
3260e529 MB |
390 | * This relies on each bank being in address order. |
391 | * The banks are sorted previously in bootmem_init(). | |
a013053d | 392 | */ |
1c2f87c2 LA |
393 | for_each_memblock(memory, reg) { |
394 | start = memblock_region_memory_base_pfn(reg); | |
a013053d | 395 | |
9af386c8 WD |
396 | #ifdef CONFIG_SPARSEMEM |
397 | /* | |
398 | * Take care not to free memmap entries that don't exist | |
399 | * due to SPARSEMEM sections which aren't present. | |
400 | */ | |
1c2f87c2 LA |
401 | start = min(start, |
402 | ALIGN(prev_end, PAGES_PER_SECTION)); | |
002ea9ee LW |
403 | #else |
404 | /* | |
405 | * Align down here since the VM subsystem insists that the | |
406 | * memmap entries are valid from the bank start aligned to | |
407 | * MAX_ORDER_NR_PAGES. | |
408 | */ | |
1c2f87c2 | 409 | start = round_down(start, MAX_ORDER_NR_PAGES); |
9af386c8 | 410 | #endif |
a013053d RK |
411 | /* |
412 | * If we had a previous bank, and there is a space | |
413 | * between the current bank and the previous, free it. | |
414 | */ | |
1c2f87c2 LA |
415 | if (prev_end && prev_end < start) |
416 | free_memmap(prev_end, start); | |
a013053d | 417 | |
3260e529 MB |
418 | /* |
419 | * Align up here since the VM subsystem insists that the | |
420 | * memmap entries are valid from the bank end aligned to | |
421 | * MAX_ORDER_NR_PAGES. | |
422 | */ | |
1c2f87c2 LA |
423 | prev_end = ALIGN(memblock_region_memory_end_pfn(reg), |
424 | MAX_ORDER_NR_PAGES); | |
a013053d | 425 | } |
9af386c8 WD |
426 | |
427 | #ifdef CONFIG_SPARSEMEM | |
1c2f87c2 LA |
428 | if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) |
429 | free_memmap(prev_end, | |
430 | ALIGN(prev_end, PAGES_PER_SECTION)); | |
9af386c8 | 431 | #endif |
a013053d RK |
432 | } |
433 | ||
83db0384 JL |
434 | #ifdef CONFIG_HIGHMEM |
435 | static inline void free_area_high(unsigned long pfn, unsigned long end) | |
436 | { | |
dd6911ef JL |
437 | for (; pfn < end; pfn++) |
438 | free_highmem_page(pfn_to_page(pfn)); | |
83db0384 JL |
439 | } |
440 | #endif | |
441 | ||
d0e775af RK |
442 | static void __init free_highpages(void) |
443 | { | |
444 | #ifdef CONFIG_HIGHMEM | |
26ba47b1 | 445 | unsigned long max_low = max_low_pfn; |
df4f14c7 | 446 | struct memblock_region *mem, *res; |
d0e775af RK |
447 | |
448 | /* set highmem page free */ | |
df4f14c7 RK |
449 | for_each_memblock(memory, mem) { |
450 | unsigned long start = memblock_region_memory_base_pfn(mem); | |
451 | unsigned long end = memblock_region_memory_end_pfn(mem); | |
452 | ||
453 | /* Ignore complete lowmem entries */ | |
454 | if (end <= max_low) | |
455 | continue; | |
456 | ||
09414d00 AB |
457 | if (memblock_is_nomap(mem)) |
458 | continue; | |
459 | ||
df4f14c7 RK |
460 | /* Truncate partial highmem entries */ |
461 | if (start < max_low) | |
462 | start = max_low; | |
463 | ||
464 | /* Find and exclude any reserved regions */ | |
465 | for_each_memblock(reserved, res) { | |
466 | unsigned long res_start, res_end; | |
467 | ||
468 | res_start = memblock_region_reserved_base_pfn(res); | |
469 | res_end = memblock_region_reserved_end_pfn(res); | |
470 | ||
471 | if (res_end < start) | |
472 | continue; | |
473 | if (res_start < start) | |
474 | res_start = start; | |
475 | if (res_start > end) | |
476 | res_start = end; | |
477 | if (res_end > end) | |
478 | res_end = end; | |
479 | if (res_start != start) | |
83db0384 | 480 | free_area_high(start, res_start); |
df4f14c7 RK |
481 | start = res_end; |
482 | if (start == end) | |
483 | break; | |
484 | } | |
485 | ||
486 | /* And now free anything which remains */ | |
487 | if (start < end) | |
83db0384 | 488 | free_area_high(start, end); |
d0e775af | 489 | } |
d0e775af RK |
490 | #endif |
491 | } | |
492 | ||
1da177e4 LT |
493 | /* |
494 | * mem_init() marks the free areas in the mem_map and tells us how much | |
495 | * memory is free. This is done after various parts of the system have | |
496 | * claimed their memory after the kernel image. | |
497 | */ | |
498 | void __init mem_init(void) | |
499 | { | |
1dbd30e9 LW |
500 | #ifdef CONFIG_HAVE_TCM |
501 | /* These pointers are filled in on TCM detection */ | |
502 | extern u32 dtcm_end; | |
503 | extern u32 itcm_end; | |
504 | #endif | |
1da177e4 | 505 | |
b3ba41f2 | 506 | set_max_mapnr(pfn_to_page(max_pfn) - mem_map); |
1da177e4 | 507 | |
1da177e4 | 508 | /* this will put all unused low memory onto the freelists */ |
1c2f87c2 | 509 | free_unused_memmap(); |
0c988534 | 510 | free_all_bootmem(); |
1da177e4 LT |
511 | |
512 | #ifdef CONFIG_SA1111 | |
513 | /* now that our DMA memory is actually so designated, we can free it */ | |
bfd65dd9 | 514 | free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); |
1da177e4 LT |
515 | #endif |
516 | ||
d0e775af | 517 | free_highpages(); |
3835f6cb | 518 | |
2450c973 | 519 | mem_init_print_info(NULL); |
1da177e4 | 520 | |
db9ef1af FB |
521 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
522 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
523 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
524 | ||
4ed89f22 | 525 | pr_notice("Virtual kernel memory layout:\n" |
db9ef1af | 526 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 527 | #ifdef CONFIG_HAVE_TCM |
07d2a5c7 | 528 | " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 529 | " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 530 | #endif |
db9ef1af FB |
531 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
532 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
533 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
534 | #ifdef CONFIG_HIGHMEM | |
535 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
536 | #endif | |
d9277d51 | 537 | #ifdef CONFIG_MODULES |
db9ef1af | 538 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" |
d9277d51 | 539 | #endif |
178c3dfe RK |
540 | " .text : 0x%p" " - 0x%p" " (%4td kB)\n" |
541 | " .init : 0x%p" " - 0x%p" " (%4td kB)\n" | |
542 | " .data : 0x%p" " - 0x%p" " (%4td kB)\n" | |
543 | " .bss : 0x%p" " - 0x%p" " (%4td kB)\n", | |
db9ef1af | 544 | |
d2ca5f24 | 545 | MLK(VECTORS_BASE, VECTORS_BASE + PAGE_SIZE), |
07d2a5c7 | 546 | #ifdef CONFIG_HAVE_TCM |
1dbd30e9 LW |
547 | MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
548 | MLK(ITCM_OFFSET, (unsigned long) itcm_end), | |
07d2a5c7 | 549 | #endif |
b615bbbf | 550 | MLK(FIXADDR_START, FIXADDR_END), |
c931b4f6 | 551 | MLM(VMALLOC_START, VMALLOC_END), |
db9ef1af FB |
552 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
553 | #ifdef CONFIG_HIGHMEM | |
554 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * | |
555 | (PAGE_SIZE)), | |
556 | #endif | |
d9277d51 | 557 | #ifdef CONFIG_MODULES |
db9ef1af | 558 | MLM(MODULES_VADDR, MODULES_END), |
d9277d51 | 559 | #endif |
db9ef1af | 560 | |
db9ef1af | 561 | MLK_ROUNDUP(_text, _etext), |
3835d69a | 562 | MLK_ROUNDUP(__init_begin, __init_end), |
45f6d7e0 RV |
563 | MLK_ROUNDUP(_sdata, _edata), |
564 | MLK_ROUNDUP(__bss_start, __bss_stop)); | |
db9ef1af FB |
565 | |
566 | #undef MLK | |
567 | #undef MLM | |
568 | #undef MLK_ROUNDUP | |
569 | ||
a1839272 FB |
570 | /* |
571 | * Check boundaries twice: Some fundamental inconsistencies can | |
572 | * be detected at build time already. | |
573 | */ | |
574 | #ifdef CONFIG_MMU | |
a1839272 FB |
575 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
576 | BUG_ON(TASK_SIZE > MODULES_VADDR); | |
577 | #endif | |
578 | ||
579 | #ifdef CONFIG_HIGHMEM | |
580 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
581 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
582 | #endif | |
583 | ||
2450c973 | 584 | if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { |
1da177e4 LT |
585 | extern int sysctl_overcommit_memory; |
586 | /* | |
587 | * On a machine this small we won't get | |
588 | * anywhere without overcommit, so turn | |
589 | * it on by default. | |
590 | */ | |
591 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
592 | } | |
593 | } | |
594 | ||
0f5bf6d0 | 595 | #ifdef CONFIG_STRICT_KERNEL_RWX |
1e6b4811 | 596 | struct section_perm { |
25362dc4 | 597 | const char *name; |
1e6b4811 KC |
598 | unsigned long start; |
599 | unsigned long end; | |
600 | pmdval_t mask; | |
601 | pmdval_t prot; | |
80d6b0c2 | 602 | pmdval_t clear; |
1e6b4811 KC |
603 | }; |
604 | ||
64ac2e74 KC |
605 | /* First section-aligned location at or after __start_rodata. */ |
606 | extern char __start_rodata_section_aligned[]; | |
607 | ||
80d6b0c2 | 608 | static struct section_perm nx_perms[] = { |
1e6b4811 KC |
609 | /* Make pages tables, etc before _stext RW (set NX). */ |
610 | { | |
25362dc4 | 611 | .name = "pre-text NX", |
1e6b4811 KC |
612 | .start = PAGE_OFFSET, |
613 | .end = (unsigned long)_stext, | |
614 | .mask = ~PMD_SECT_XN, | |
615 | .prot = PMD_SECT_XN, | |
616 | }, | |
617 | /* Make init RW (set NX). */ | |
618 | { | |
25362dc4 | 619 | .name = "init NX", |
1e6b4811 KC |
620 | .start = (unsigned long)__init_begin, |
621 | .end = (unsigned long)_sdata, | |
622 | .mask = ~PMD_SECT_XN, | |
623 | .prot = PMD_SECT_XN, | |
624 | }, | |
80d6b0c2 KC |
625 | /* Make rodata NX (set RO in ro_perms below). */ |
626 | { | |
25362dc4 | 627 | .name = "rodata NX", |
64ac2e74 | 628 | .start = (unsigned long)__start_rodata_section_aligned, |
80d6b0c2 KC |
629 | .end = (unsigned long)__init_begin, |
630 | .mask = ~PMD_SECT_XN, | |
631 | .prot = PMD_SECT_XN, | |
632 | }, | |
1e6b4811 KC |
633 | }; |
634 | ||
80d6b0c2 KC |
635 | static struct section_perm ro_perms[] = { |
636 | /* Make kernel code and rodata RX (set RO). */ | |
637 | { | |
25362dc4 | 638 | .name = "text/rodata RO", |
80d6b0c2 KC |
639 | .start = (unsigned long)_stext, |
640 | .end = (unsigned long)__init_begin, | |
641 | #ifdef CONFIG_ARM_LPAE | |
1e347922 VK |
642 | .mask = ~L_PMD_SECT_RDONLY, |
643 | .prot = L_PMD_SECT_RDONLY, | |
80d6b0c2 KC |
644 | #else |
645 | .mask = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE), | |
646 | .prot = PMD_SECT_APX | PMD_SECT_AP_WRITE, | |
647 | .clear = PMD_SECT_AP_WRITE, | |
648 | #endif | |
649 | }, | |
650 | }; | |
80d6b0c2 | 651 | |
1e6b4811 KC |
652 | /* |
653 | * Updates section permissions only for the current mm (sections are | |
654 | * copied into each mm). During startup, this is the init_mm. Is only | |
655 | * safe to be called with preemption disabled, as under stop_machine(). | |
656 | */ | |
657 | static inline void section_update(unsigned long addr, pmdval_t mask, | |
08925c2f | 658 | pmdval_t prot, struct mm_struct *mm) |
1e6b4811 | 659 | { |
1e6b4811 KC |
660 | pmd_t *pmd; |
661 | ||
1e6b4811 KC |
662 | pmd = pmd_offset(pud_offset(pgd_offset(mm, addr), addr), addr); |
663 | ||
664 | #ifdef CONFIG_ARM_LPAE | |
665 | pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); | |
666 | #else | |
667 | if (addr & SECTION_SIZE) | |
668 | pmd[1] = __pmd((pmd_val(pmd[1]) & mask) | prot); | |
669 | else | |
670 | pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); | |
671 | #endif | |
672 | flush_pmd_entry(pmd); | |
673 | local_flush_tlb_kernel_range(addr, addr + SECTION_SIZE); | |
674 | } | |
675 | ||
676 | /* Make sure extended page tables are in use. */ | |
677 | static inline bool arch_has_strict_perms(void) | |
678 | { | |
679 | if (cpu_architecture() < CPU_ARCH_ARMv6) | |
680 | return false; | |
681 | ||
682 | return !!(get_cr() & CR_XP); | |
683 | } | |
684 | ||
08925c2f LA |
685 | void set_section_perms(struct section_perm *perms, int n, bool set, |
686 | struct mm_struct *mm) | |
687 | { | |
688 | size_t i; | |
689 | unsigned long addr; | |
690 | ||
691 | if (!arch_has_strict_perms()) | |
692 | return; | |
693 | ||
694 | for (i = 0; i < n; i++) { | |
695 | if (!IS_ALIGNED(perms[i].start, SECTION_SIZE) || | |
696 | !IS_ALIGNED(perms[i].end, SECTION_SIZE)) { | |
25362dc4 KC |
697 | pr_err("BUG: %s section %lx-%lx not aligned to %lx\n", |
698 | perms[i].name, perms[i].start, perms[i].end, | |
08925c2f LA |
699 | SECTION_SIZE); |
700 | continue; | |
701 | } | |
702 | ||
703 | for (addr = perms[i].start; | |
704 | addr < perms[i].end; | |
705 | addr += SECTION_SIZE) | |
706 | section_update(addr, perms[i].mask, | |
707 | set ? perms[i].prot : perms[i].clear, mm); | |
708 | } | |
709 | ||
1e6b4811 KC |
710 | } |
711 | ||
08925c2f | 712 | static void update_sections_early(struct section_perm perms[], int n) |
1e6b4811 | 713 | { |
08925c2f LA |
714 | struct task_struct *t, *s; |
715 | ||
716 | read_lock(&tasklist_lock); | |
717 | for_each_process(t) { | |
718 | if (t->flags & PF_KTHREAD) | |
719 | continue; | |
720 | for_each_thread(t, s) | |
721 | set_section_perms(perms, n, true, s->mm); | |
722 | } | |
723 | read_unlock(&tasklist_lock); | |
724 | set_section_perms(perms, n, true, current->active_mm); | |
725 | set_section_perms(perms, n, true, &init_mm); | |
726 | } | |
727 | ||
728 | int __fix_kernmem_perms(void *unused) | |
729 | { | |
730 | update_sections_early(nx_perms, ARRAY_SIZE(nx_perms)); | |
731 | return 0; | |
732 | } | |
733 | ||
734 | void fix_kernmem_perms(void) | |
735 | { | |
736 | stop_machine(__fix_kernmem_perms, NULL, NULL); | |
1e6b4811 | 737 | } |
80d6b0c2 | 738 | |
08925c2f LA |
739 | int __mark_rodata_ro(void *unused) |
740 | { | |
741 | update_sections_early(ro_perms, ARRAY_SIZE(ro_perms)); | |
742 | return 0; | |
743 | } | |
744 | ||
80d6b0c2 KC |
745 | void mark_rodata_ro(void) |
746 | { | |
08925c2f | 747 | stop_machine(__mark_rodata_ro, NULL, NULL); |
80d6b0c2 KC |
748 | } |
749 | ||
750 | void set_kernel_text_rw(void) | |
751 | { | |
08925c2f LA |
752 | set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), false, |
753 | current->active_mm); | |
80d6b0c2 KC |
754 | } |
755 | ||
756 | void set_kernel_text_ro(void) | |
757 | { | |
08925c2f LA |
758 | set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), true, |
759 | current->active_mm); | |
80d6b0c2 | 760 | } |
80d6b0c2 | 761 | |
1e6b4811 KC |
762 | #else |
763 | static inline void fix_kernmem_perms(void) { } | |
0f5bf6d0 | 764 | #endif /* CONFIG_STRICT_KERNEL_RWX */ |
1e6b4811 KC |
765 | |
766 | void free_tcmmem(void) | |
1da177e4 | 767 | { |
bc581770 | 768 | #ifdef CONFIG_HAVE_TCM |
ea208f64 | 769 | extern char __tcm_start, __tcm_end; |
bc581770 | 770 | |
54d52573 | 771 | poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); |
dbe67df4 | 772 | free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); |
bc581770 | 773 | #endif |
1e6b4811 KC |
774 | } |
775 | ||
776 | void free_initmem(void) | |
777 | { | |
778 | fix_kernmem_perms(); | |
779 | free_tcmmem(); | |
bc581770 | 780 | |
54d52573 | 781 | poison_init_mem(__init_begin, __init_end - __init_begin); |
6db015e4 | 782 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
dbe67df4 | 783 | free_initmem_default(-1); |
1da177e4 LT |
784 | } |
785 | ||
786 | #ifdef CONFIG_BLK_DEV_INITRD | |
787 | ||
788 | static int keep_initrd; | |
789 | ||
790 | void free_initrd_mem(unsigned long start, unsigned long end) | |
791 | { | |
54d52573 | 792 | if (!keep_initrd) { |
421520ba YW |
793 | if (start == initrd_start) |
794 | start = round_down(start, PAGE_SIZE); | |
795 | if (end == initrd_end) | |
796 | end = round_up(end, PAGE_SIZE); | |
797 | ||
54d52573 | 798 | poison_init_mem((void *)start, PAGE_ALIGN(end) - start); |
dbe67df4 | 799 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
54d52573 | 800 | } |
1da177e4 LT |
801 | } |
802 | ||
803 | static int __init keepinitrd_setup(char *__unused) | |
804 | { | |
805 | keep_initrd = 1; | |
806 | return 1; | |
807 | } | |
808 | ||
809 | __setup("keepinitrd", keepinitrd_setup); | |
810 | #endif |