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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> | |
1da177e4 | 14 | #include <linux/mman.h> |
3f07c014 | 15 | #include <linux/sched/signal.h> |
29930025 | 16 | #include <linux/sched/task.h> |
dc28094b | 17 | #include <linux/export.h> |
1da177e4 LT |
18 | #include <linux/nodemask.h> |
19 | #include <linux/initrd.h> | |
9eb8f674 | 20 | #include <linux/of_fdt.h> |
3835f6cb | 21 | #include <linux/highmem.h> |
5a0e3ad6 | 22 | #include <linux/gfp.h> |
2778f620 | 23 | #include <linux/memblock.h> |
c7909509 | 24 | #include <linux/dma-contiguous.h> |
158e8bfe | 25 | #include <linux/sizes.h> |
08925c2f | 26 | #include <linux/stop_machine.h> |
1da177e4 | 27 | |
b4b20ad8 | 28 | #include <asm/cp15.h> |
1da177e4 | 29 | #include <asm/mach-types.h> |
716a3dc2 | 30 | #include <asm/memblock.h> |
d2ca5f24 | 31 | #include <asm/memory.h> |
93c02ab4 | 32 | #include <asm/prom.h> |
37efe642 | 33 | #include <asm/sections.h> |
1da177e4 | 34 | #include <asm/setup.h> |
1e6b4811 | 35 | #include <asm/system_info.h> |
1da177e4 | 36 | #include <asm/tlb.h> |
db9ef1af | 37 | #include <asm/fixmap.h> |
a8e53c15 | 38 | #include <asm/ptdump.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 | ||
b1ab95c6 | 53 | #ifdef CONFIG_BLK_DEV_INITRD |
012d1f4a RK |
54 | static int __init parse_tag_initrd(const struct tag *tag) |
55 | { | |
4ed89f22 | 56 | pr_warn("ATAG_INITRD is deprecated; " |
012d1f4a RK |
57 | "please update your bootloader.\n"); |
58 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); | |
59 | phys_initrd_size = tag->u.initrd.size; | |
60 | return 0; | |
61 | } | |
62 | ||
63 | __tagtable(ATAG_INITRD, parse_tag_initrd); | |
64 | ||
65 | static int __init parse_tag_initrd2(const struct tag *tag) | |
66 | { | |
67 | phys_initrd_start = tag->u.initrd.start; | |
68 | phys_initrd_size = tag->u.initrd.size; | |
69 | return 0; | |
70 | } | |
71 | ||
72 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); | |
b1ab95c6 | 73 | #endif |
1da177e4 | 74 | |
f25b4b4c | 75 | static void __init find_limits(unsigned long *min, unsigned long *max_low, |
27a3f0e9 | 76 | unsigned long *max_high) |
dde5828f | 77 | { |
1c2f87c2 LA |
78 | *max_low = PFN_DOWN(memblock_get_current_limit()); |
79 | *min = PFN_UP(memblock_start_of_DRAM()); | |
80 | *max_high = PFN_DOWN(memblock_end_of_DRAM()); | |
dde5828f RK |
81 | } |
82 | ||
be20902b | 83 | #ifdef CONFIG_ZONE_DMA |
65032018 | 84 | |
364230b9 | 85 | phys_addr_t arm_dma_zone_size __read_mostly; |
65032018 NP |
86 | EXPORT_SYMBOL(arm_dma_zone_size); |
87 | ||
022ae537 RK |
88 | /* |
89 | * The DMA mask corresponding to the maximum bus address allocatable | |
90 | * using GFP_DMA. The default here places no restriction on DMA | |
91 | * allocations. This must be the smallest DMA mask in the system, | |
92 | * so a successful GFP_DMA allocation will always satisfy this. | |
93 | */ | |
4986e5c7 | 94 | phys_addr_t arm_dma_limit; |
4dcfa600 | 95 | unsigned long arm_dma_pfn_limit; |
022ae537 | 96 | |
be20902b RK |
97 | static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, |
98 | unsigned long dma_size) | |
99 | { | |
100 | if (size[0] <= dma_size) | |
101 | return; | |
102 | ||
103 | size[ZONE_NORMAL] = size[0] - dma_size; | |
104 | size[ZONE_DMA] = dma_size; | |
105 | hole[ZONE_NORMAL] = hole[0]; | |
106 | hole[ZONE_DMA] = 0; | |
107 | } | |
108 | #endif | |
109 | ||
ff69a4c8 | 110 | void __init setup_dma_zone(const struct machine_desc *mdesc) |
c7909509 MS |
111 | { |
112 | #ifdef CONFIG_ZONE_DMA | |
113 | if (mdesc->dma_zone_size) { | |
114 | arm_dma_zone_size = mdesc->dma_zone_size; | |
6bcac805 | 115 | arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; |
c7909509 MS |
116 | } else |
117 | arm_dma_limit = 0xffffffff; | |
4dcfa600 | 118 | arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT; |
c7909509 MS |
119 | #endif |
120 | } | |
121 | ||
84f452b1 | 122 | static void __init zone_sizes_init(unsigned long min, unsigned long max_low, |
a2c54d2a | 123 | unsigned long max_high) |
b7a69ac3 RK |
124 | { |
125 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
a2c54d2a | 126 | struct memblock_region *reg; |
b7a69ac3 | 127 | |
90072059 | 128 | /* |
be370302 | 129 | * initialise the zones. |
90072059 RK |
130 | */ |
131 | memset(zone_size, 0, sizeof(zone_size)); | |
90072059 RK |
132 | |
133 | /* | |
be370302 RK |
134 | * The memory size has already been determined. If we need |
135 | * to do anything fancy with the allocation of this memory | |
136 | * to the zones, now is the time to do it. | |
90072059 | 137 | */ |
dde5828f RK |
138 | zone_size[0] = max_low - min; |
139 | #ifdef CONFIG_HIGHMEM | |
140 | zone_size[ZONE_HIGHMEM] = max_high - max_low; | |
141 | #endif | |
90072059 RK |
142 | |
143 | /* | |
be370302 RK |
144 | * Calculate the size of the holes. |
145 | * holes = node_size - sum(bank_sizes) | |
90072059 | 146 | */ |
dde5828f | 147 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
a2c54d2a RK |
148 | for_each_memblock(memory, reg) { |
149 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
150 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
151 | ||
152 | if (start < max_low) { | |
153 | unsigned long low_end = min(end, max_low); | |
154 | zhole_size[0] -= low_end - start; | |
155 | } | |
dde5828f | 156 | #ifdef CONFIG_HIGHMEM |
a2c54d2a RK |
157 | if (end > max_low) { |
158 | unsigned long high_start = max(start, max_low); | |
159 | zhole_size[ZONE_HIGHMEM] -= end - high_start; | |
160 | } | |
dde5828f | 161 | #endif |
dde5828f | 162 | } |
90072059 | 163 | |
65032018 | 164 | #ifdef CONFIG_ZONE_DMA |
90072059 RK |
165 | /* |
166 | * Adjust the sizes according to any special requirements for | |
167 | * this machine type. | |
168 | */ | |
c7909509 | 169 | if (arm_dma_zone_size) |
65032018 NP |
170 | arm_adjust_dma_zone(zone_size, zhole_size, |
171 | arm_dma_zone_size >> PAGE_SHIFT); | |
be20902b | 172 | #endif |
90072059 | 173 | |
be370302 | 174 | free_area_init_node(0, zone_size, min, zhole_size); |
1da177e4 LT |
175 | } |
176 | ||
7b7bf499 | 177 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
b7cfda9f RK |
178 | int pfn_valid(unsigned long pfn) |
179 | { | |
09414d00 | 180 | return memblock_is_map_memory(__pfn_to_phys(pfn)); |
b7cfda9f RK |
181 | } |
182 | EXPORT_SYMBOL(pfn_valid); | |
7b7bf499 | 183 | #endif |
657e12fd | 184 | |
7b7bf499 | 185 | #ifndef CONFIG_SPARSEMEM |
14904927 | 186 | static void __init arm_memory_present(void) |
657e12fd RK |
187 | { |
188 | } | |
189 | #else | |
14904927 | 190 | static void __init arm_memory_present(void) |
657e12fd | 191 | { |
719c1514 | 192 | struct memblock_region *reg; |
719c1514 | 193 | |
7c996361 | 194 | for_each_memblock(memory, reg) |
c7fc2de0 YL |
195 | memory_present(0, memblock_region_memory_base_pfn(reg), |
196 | memblock_region_memory_end_pfn(reg)); | |
657e12fd | 197 | } |
b7cfda9f RK |
198 | #endif |
199 | ||
716a3dc2 RK |
200 | static bool arm_memblock_steal_permitted = true; |
201 | ||
bc2827d0 | 202 | phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) |
716a3dc2 RK |
203 | { |
204 | phys_addr_t phys; | |
205 | ||
206 | BUG_ON(!arm_memblock_steal_permitted); | |
207 | ||
f240ec09 | 208 | phys = memblock_phys_alloc(size, align); |
716a3dc2 RK |
209 | memblock_free(phys, size); |
210 | memblock_remove(phys, size); | |
211 | ||
212 | return phys; | |
213 | } | |
214 | ||
39286248 | 215 | static void __init arm_initrd_init(void) |
2778f620 | 216 | { |
2778f620 | 217 | #ifdef CONFIG_BLK_DEV_INITRD |
cdcc5fa0 RK |
218 | phys_addr_t start; |
219 | unsigned long size; | |
220 | ||
4c235cb9 | 221 | initrd_start = initrd_end = 0; |
68b32f36 RK |
222 | |
223 | if (!phys_initrd_size) | |
224 | return; | |
225 | ||
cdcc5fa0 RK |
226 | /* |
227 | * Round the memory region to page boundaries as per free_initrd_mem() | |
228 | * This allows us to detect whether the pages overlapping the initrd | |
229 | * are in use, but more importantly, reserves the entire set of pages | |
230 | * as we don't want these pages allocated for other purposes. | |
231 | */ | |
232 | start = round_down(phys_initrd_start, PAGE_SIZE); | |
233 | size = phys_initrd_size + (phys_initrd_start - start); | |
234 | size = round_up(size, PAGE_SIZE); | |
235 | ||
236 | if (!memblock_is_region_memory(start, size)) { | |
de22cc6e | 237 | pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", |
cdcc5fa0 | 238 | (u64)start, size); |
68b32f36 | 239 | return; |
8f4b8c76 | 240 | } |
68b32f36 | 241 | |
cdcc5fa0 | 242 | if (memblock_is_region_reserved(start, size)) { |
de22cc6e | 243 | pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", |
cdcc5fa0 | 244 | (u64)start, size); |
68b32f36 | 245 | return; |
b0a2679d | 246 | } |
2778f620 | 247 | |
cdcc5fa0 | 248 | memblock_reserve(start, size); |
68b32f36 RK |
249 | |
250 | /* Now convert initrd to virtual addresses */ | |
251 | initrd_start = __phys_to_virt(phys_initrd_start); | |
252 | initrd_end = initrd_start + phys_initrd_size; | |
2778f620 | 253 | #endif |
39286248 RK |
254 | } |
255 | ||
256 | void __init arm_memblock_init(const struct machine_desc *mdesc) | |
257 | { | |
258 | /* Register the kernel text, kernel data and initrd with memblock. */ | |
259 | memblock_reserve(__pa(KERNEL_START), KERNEL_END - KERNEL_START); | |
260 | ||
261 | arm_initrd_init(); | |
2778f620 RK |
262 | |
263 | arm_mm_memblock_reserve(); | |
264 | ||
8d717a52 RK |
265 | /* reserve any platform specific memblock areas */ |
266 | if (mdesc->reserve) | |
267 | mdesc->reserve(); | |
268 | ||
24bbd929 | 269 | early_init_fdt_reserve_self(); |
bcedb5f9 MS |
270 | early_init_fdt_scan_reserved_mem(); |
271 | ||
99a468d7 | 272 | /* reserve memory for DMA contiguous allocations */ |
95b0e655 | 273 | dma_contiguous_reserve(arm_dma_limit); |
c7909509 | 274 | |
716a3dc2 | 275 | arm_memblock_steal_permitted = false; |
2778f620 RK |
276 | memblock_dump_all(); |
277 | } | |
278 | ||
8d717a52 | 279 | void __init bootmem_init(void) |
1da177e4 | 280 | { |
dde5828f | 281 | unsigned long min, max_low, max_high; |
1da177e4 | 282 | |
8e58caef | 283 | memblock_allow_resize(); |
dde5828f RK |
284 | max_low = max_high = 0; |
285 | ||
f25b4b4c | 286 | find_limits(&min, &max_low, &max_high); |
dde5828f | 287 | |
d30eae47 VM |
288 | early_memtest((phys_addr_t)min << PAGE_SHIFT, |
289 | (phys_addr_t)max_low << PAGE_SHIFT); | |
290 | ||
be370302 RK |
291 | /* |
292 | * Sparsemem tries to allocate bootmem in memory_present(), | |
293 | * so must be done after the fixed reservations | |
294 | */ | |
eda2e5dc | 295 | arm_memory_present(); |
1da177e4 | 296 | |
b7a69ac3 RK |
297 | /* |
298 | * sparse_init() needs the bootmem allocator up and running. | |
299 | */ | |
300 | sparse_init(); | |
301 | ||
302 | /* | |
be370302 | 303 | * Now free the memory - free_area_init_node needs |
b7a69ac3 RK |
304 | * the sparse mem_map arrays initialized by sparse_init() |
305 | * for memmap_init_zone(), otherwise all PFNs are invalid. | |
306 | */ | |
84f452b1 | 307 | zone_sizes_init(min, max_low, max_high); |
b7a69ac3 | 308 | |
90072059 RK |
309 | /* |
310 | * This doesn't seem to be used by the Linux memory manager any | |
311 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
312 | * also get rid of some of the stuff above as well. | |
90072059 | 313 | */ |
26ba47b1 SS |
314 | min_low_pfn = min; |
315 | max_low_pfn = max_low; | |
316 | max_pfn = max_high; | |
90072059 | 317 | } |
1da177e4 | 318 | |
54d52573 SB |
319 | /* |
320 | * Poison init memory with an undefined instruction (ARM) or a branch to an | |
321 | * undefined instruction (Thumb). | |
322 | */ | |
323 | static inline void poison_init_mem(void *s, size_t count) | |
324 | { | |
325 | u32 *p = (u32 *)s; | |
bf912d99 | 326 | for (; count != 0; count -= 4) |
54d52573 SB |
327 | *p++ = 0xe7fddef0; |
328 | } | |
329 | ||
a013053d | 330 | static inline void |
be370302 | 331 | free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
a013053d RK |
332 | { |
333 | struct page *start_pg, *end_pg; | |
56bc6286 | 334 | phys_addr_t pg, pgend; |
a013053d RK |
335 | |
336 | /* | |
337 | * Convert start_pfn/end_pfn to a struct page pointer. | |
338 | */ | |
3257f43d | 339 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
9af386c8 | 340 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
a013053d RK |
341 | |
342 | /* | |
343 | * Convert to physical addresses, and | |
344 | * round start upwards and end downwards. | |
345 | */ | |
56bc6286 VA |
346 | pg = PAGE_ALIGN(__pa(start_pg)); |
347 | pgend = __pa(end_pg) & PAGE_MASK; | |
a013053d RK |
348 | |
349 | /* | |
350 | * If there are free pages between these, | |
351 | * free the section of the memmap array. | |
352 | */ | |
353 | if (pg < pgend) | |
cfb66586 | 354 | memblock_free_early(pg, pgend - pg); |
a013053d RK |
355 | } |
356 | ||
357 | /* | |
358 | * The mem_map array can get very big. Free the unused area of the memory map. | |
359 | */ | |
1c2f87c2 | 360 | static void __init free_unused_memmap(void) |
a013053d | 361 | { |
1c2f87c2 LA |
362 | unsigned long start, prev_end = 0; |
363 | struct memblock_region *reg; | |
a013053d RK |
364 | |
365 | /* | |
3260e529 MB |
366 | * This relies on each bank being in address order. |
367 | * The banks are sorted previously in bootmem_init(). | |
a013053d | 368 | */ |
1c2f87c2 LA |
369 | for_each_memblock(memory, reg) { |
370 | start = memblock_region_memory_base_pfn(reg); | |
a013053d | 371 | |
9af386c8 WD |
372 | #ifdef CONFIG_SPARSEMEM |
373 | /* | |
374 | * Take care not to free memmap entries that don't exist | |
375 | * due to SPARSEMEM sections which aren't present. | |
376 | */ | |
1c2f87c2 LA |
377 | start = min(start, |
378 | ALIGN(prev_end, PAGES_PER_SECTION)); | |
002ea9ee LW |
379 | #else |
380 | /* | |
381 | * Align down here since the VM subsystem insists that the | |
382 | * memmap entries are valid from the bank start aligned to | |
383 | * MAX_ORDER_NR_PAGES. | |
384 | */ | |
1c2f87c2 | 385 | start = round_down(start, MAX_ORDER_NR_PAGES); |
9af386c8 | 386 | #endif |
a013053d RK |
387 | /* |
388 | * If we had a previous bank, and there is a space | |
389 | * between the current bank and the previous, free it. | |
390 | */ | |
1c2f87c2 LA |
391 | if (prev_end && prev_end < start) |
392 | free_memmap(prev_end, start); | |
a013053d | 393 | |
3260e529 MB |
394 | /* |
395 | * Align up here since the VM subsystem insists that the | |
396 | * memmap entries are valid from the bank end aligned to | |
397 | * MAX_ORDER_NR_PAGES. | |
398 | */ | |
1c2f87c2 LA |
399 | prev_end = ALIGN(memblock_region_memory_end_pfn(reg), |
400 | MAX_ORDER_NR_PAGES); | |
a013053d | 401 | } |
9af386c8 WD |
402 | |
403 | #ifdef CONFIG_SPARSEMEM | |
1c2f87c2 LA |
404 | if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) |
405 | free_memmap(prev_end, | |
406 | ALIGN(prev_end, PAGES_PER_SECTION)); | |
9af386c8 | 407 | #endif |
a013053d RK |
408 | } |
409 | ||
83db0384 JL |
410 | #ifdef CONFIG_HIGHMEM |
411 | static inline void free_area_high(unsigned long pfn, unsigned long end) | |
412 | { | |
dd6911ef JL |
413 | for (; pfn < end; pfn++) |
414 | free_highmem_page(pfn_to_page(pfn)); | |
83db0384 JL |
415 | } |
416 | #endif | |
417 | ||
d0e775af RK |
418 | static void __init free_highpages(void) |
419 | { | |
420 | #ifdef CONFIG_HIGHMEM | |
26ba47b1 | 421 | unsigned long max_low = max_low_pfn; |
df4f14c7 | 422 | struct memblock_region *mem, *res; |
d0e775af RK |
423 | |
424 | /* set highmem page free */ | |
df4f14c7 RK |
425 | for_each_memblock(memory, mem) { |
426 | unsigned long start = memblock_region_memory_base_pfn(mem); | |
427 | unsigned long end = memblock_region_memory_end_pfn(mem); | |
428 | ||
429 | /* Ignore complete lowmem entries */ | |
430 | if (end <= max_low) | |
431 | continue; | |
432 | ||
09414d00 AB |
433 | if (memblock_is_nomap(mem)) |
434 | continue; | |
435 | ||
df4f14c7 RK |
436 | /* Truncate partial highmem entries */ |
437 | if (start < max_low) | |
438 | start = max_low; | |
439 | ||
440 | /* Find and exclude any reserved regions */ | |
441 | for_each_memblock(reserved, res) { | |
442 | unsigned long res_start, res_end; | |
443 | ||
444 | res_start = memblock_region_reserved_base_pfn(res); | |
445 | res_end = memblock_region_reserved_end_pfn(res); | |
446 | ||
447 | if (res_end < start) | |
448 | continue; | |
449 | if (res_start < start) | |
450 | res_start = start; | |
451 | if (res_start > end) | |
452 | res_start = end; | |
453 | if (res_end > end) | |
454 | res_end = end; | |
455 | if (res_start != start) | |
83db0384 | 456 | free_area_high(start, res_start); |
df4f14c7 RK |
457 | start = res_end; |
458 | if (start == end) | |
459 | break; | |
460 | } | |
461 | ||
462 | /* And now free anything which remains */ | |
463 | if (start < end) | |
83db0384 | 464 | free_area_high(start, end); |
d0e775af | 465 | } |
d0e775af RK |
466 | #endif |
467 | } | |
468 | ||
1da177e4 LT |
469 | /* |
470 | * mem_init() marks the free areas in the mem_map and tells us how much | |
471 | * memory is free. This is done after various parts of the system have | |
472 | * claimed their memory after the kernel image. | |
473 | */ | |
474 | void __init mem_init(void) | |
475 | { | |
1dbd30e9 LW |
476 | #ifdef CONFIG_HAVE_TCM |
477 | /* These pointers are filled in on TCM detection */ | |
478 | extern u32 dtcm_end; | |
479 | extern u32 itcm_end; | |
480 | #endif | |
1da177e4 | 481 | |
b3ba41f2 | 482 | set_max_mapnr(pfn_to_page(max_pfn) - mem_map); |
1da177e4 | 483 | |
1da177e4 | 484 | /* this will put all unused low memory onto the freelists */ |
1c2f87c2 | 485 | free_unused_memmap(); |
c6ffc5ca | 486 | memblock_free_all(); |
1da177e4 LT |
487 | |
488 | #ifdef CONFIG_SA1111 | |
489 | /* now that our DMA memory is actually so designated, we can free it */ | |
bfd65dd9 | 490 | free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); |
1da177e4 LT |
491 | #endif |
492 | ||
d0e775af | 493 | free_highpages(); |
3835f6cb | 494 | |
2450c973 | 495 | mem_init_print_info(NULL); |
1da177e4 | 496 | |
db9ef1af FB |
497 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
498 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
499 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
500 | ||
4ed89f22 | 501 | pr_notice("Virtual kernel memory layout:\n" |
db9ef1af | 502 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 503 | #ifdef CONFIG_HAVE_TCM |
07d2a5c7 | 504 | " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 505 | " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 506 | #endif |
db9ef1af FB |
507 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
508 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
509 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
510 | #ifdef CONFIG_HIGHMEM | |
511 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
512 | #endif | |
d9277d51 | 513 | #ifdef CONFIG_MODULES |
db9ef1af | 514 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" |
d9277d51 | 515 | #endif |
178c3dfe RK |
516 | " .text : 0x%p" " - 0x%p" " (%4td kB)\n" |
517 | " .init : 0x%p" " - 0x%p" " (%4td kB)\n" | |
518 | " .data : 0x%p" " - 0x%p" " (%4td kB)\n" | |
519 | " .bss : 0x%p" " - 0x%p" " (%4td kB)\n", | |
db9ef1af | 520 | |
d2ca5f24 | 521 | MLK(VECTORS_BASE, VECTORS_BASE + PAGE_SIZE), |
07d2a5c7 | 522 | #ifdef CONFIG_HAVE_TCM |
1dbd30e9 LW |
523 | MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
524 | MLK(ITCM_OFFSET, (unsigned long) itcm_end), | |
07d2a5c7 | 525 | #endif |
b615bbbf | 526 | MLK(FIXADDR_START, FIXADDR_END), |
c931b4f6 | 527 | MLM(VMALLOC_START, VMALLOC_END), |
db9ef1af FB |
528 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
529 | #ifdef CONFIG_HIGHMEM | |
530 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * | |
531 | (PAGE_SIZE)), | |
532 | #endif | |
d9277d51 | 533 | #ifdef CONFIG_MODULES |
db9ef1af | 534 | MLM(MODULES_VADDR, MODULES_END), |
d9277d51 | 535 | #endif |
db9ef1af | 536 | |
db9ef1af | 537 | MLK_ROUNDUP(_text, _etext), |
3835d69a | 538 | MLK_ROUNDUP(__init_begin, __init_end), |
45f6d7e0 RV |
539 | MLK_ROUNDUP(_sdata, _edata), |
540 | MLK_ROUNDUP(__bss_start, __bss_stop)); | |
db9ef1af FB |
541 | |
542 | #undef MLK | |
543 | #undef MLM | |
544 | #undef MLK_ROUNDUP | |
545 | ||
a1839272 FB |
546 | /* |
547 | * Check boundaries twice: Some fundamental inconsistencies can | |
548 | * be detected at build time already. | |
549 | */ | |
550 | #ifdef CONFIG_MMU | |
a1839272 FB |
551 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
552 | BUG_ON(TASK_SIZE > MODULES_VADDR); | |
553 | #endif | |
554 | ||
555 | #ifdef CONFIG_HIGHMEM | |
556 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
557 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
558 | #endif | |
1da177e4 LT |
559 | } |
560 | ||
0f5bf6d0 | 561 | #ifdef CONFIG_STRICT_KERNEL_RWX |
1e6b4811 | 562 | struct section_perm { |
25362dc4 | 563 | const char *name; |
1e6b4811 KC |
564 | unsigned long start; |
565 | unsigned long end; | |
566 | pmdval_t mask; | |
567 | pmdval_t prot; | |
80d6b0c2 | 568 | pmdval_t clear; |
1e6b4811 KC |
569 | }; |
570 | ||
64ac2e74 KC |
571 | /* First section-aligned location at or after __start_rodata. */ |
572 | extern char __start_rodata_section_aligned[]; | |
573 | ||
80d6b0c2 | 574 | static struct section_perm nx_perms[] = { |
1e6b4811 KC |
575 | /* Make pages tables, etc before _stext RW (set NX). */ |
576 | { | |
25362dc4 | 577 | .name = "pre-text NX", |
1e6b4811 KC |
578 | .start = PAGE_OFFSET, |
579 | .end = (unsigned long)_stext, | |
580 | .mask = ~PMD_SECT_XN, | |
581 | .prot = PMD_SECT_XN, | |
582 | }, | |
583 | /* Make init RW (set NX). */ | |
584 | { | |
25362dc4 | 585 | .name = "init NX", |
1e6b4811 KC |
586 | .start = (unsigned long)__init_begin, |
587 | .end = (unsigned long)_sdata, | |
588 | .mask = ~PMD_SECT_XN, | |
589 | .prot = PMD_SECT_XN, | |
590 | }, | |
80d6b0c2 KC |
591 | /* Make rodata NX (set RO in ro_perms below). */ |
592 | { | |
25362dc4 | 593 | .name = "rodata NX", |
64ac2e74 | 594 | .start = (unsigned long)__start_rodata_section_aligned, |
80d6b0c2 KC |
595 | .end = (unsigned long)__init_begin, |
596 | .mask = ~PMD_SECT_XN, | |
597 | .prot = PMD_SECT_XN, | |
598 | }, | |
1e6b4811 KC |
599 | }; |
600 | ||
80d6b0c2 KC |
601 | static struct section_perm ro_perms[] = { |
602 | /* Make kernel code and rodata RX (set RO). */ | |
603 | { | |
25362dc4 | 604 | .name = "text/rodata RO", |
80d6b0c2 KC |
605 | .start = (unsigned long)_stext, |
606 | .end = (unsigned long)__init_begin, | |
607 | #ifdef CONFIG_ARM_LPAE | |
400eeffa PD |
608 | .mask = ~(L_PMD_SECT_RDONLY | PMD_SECT_AP2), |
609 | .prot = L_PMD_SECT_RDONLY | PMD_SECT_AP2, | |
80d6b0c2 KC |
610 | #else |
611 | .mask = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE), | |
612 | .prot = PMD_SECT_APX | PMD_SECT_AP_WRITE, | |
613 | .clear = PMD_SECT_AP_WRITE, | |
614 | #endif | |
615 | }, | |
616 | }; | |
80d6b0c2 | 617 | |
1e6b4811 KC |
618 | /* |
619 | * Updates section permissions only for the current mm (sections are | |
620 | * copied into each mm). During startup, this is the init_mm. Is only | |
621 | * safe to be called with preemption disabled, as under stop_machine(). | |
622 | */ | |
623 | static inline void section_update(unsigned long addr, pmdval_t mask, | |
08925c2f | 624 | pmdval_t prot, struct mm_struct *mm) |
1e6b4811 | 625 | { |
1e6b4811 KC |
626 | pmd_t *pmd; |
627 | ||
1e6b4811 KC |
628 | pmd = pmd_offset(pud_offset(pgd_offset(mm, addr), addr), addr); |
629 | ||
630 | #ifdef CONFIG_ARM_LPAE | |
631 | pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); | |
632 | #else | |
633 | if (addr & SECTION_SIZE) | |
634 | pmd[1] = __pmd((pmd_val(pmd[1]) & mask) | prot); | |
635 | else | |
636 | pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); | |
637 | #endif | |
638 | flush_pmd_entry(pmd); | |
639 | local_flush_tlb_kernel_range(addr, addr + SECTION_SIZE); | |
640 | } | |
641 | ||
642 | /* Make sure extended page tables are in use. */ | |
643 | static inline bool arch_has_strict_perms(void) | |
644 | { | |
645 | if (cpu_architecture() < CPU_ARCH_ARMv6) | |
646 | return false; | |
647 | ||
648 | return !!(get_cr() & CR_XP); | |
649 | } | |
650 | ||
08925c2f LA |
651 | void set_section_perms(struct section_perm *perms, int n, bool set, |
652 | struct mm_struct *mm) | |
653 | { | |
654 | size_t i; | |
655 | unsigned long addr; | |
656 | ||
657 | if (!arch_has_strict_perms()) | |
658 | return; | |
659 | ||
660 | for (i = 0; i < n; i++) { | |
661 | if (!IS_ALIGNED(perms[i].start, SECTION_SIZE) || | |
662 | !IS_ALIGNED(perms[i].end, SECTION_SIZE)) { | |
25362dc4 KC |
663 | pr_err("BUG: %s section %lx-%lx not aligned to %lx\n", |
664 | perms[i].name, perms[i].start, perms[i].end, | |
08925c2f LA |
665 | SECTION_SIZE); |
666 | continue; | |
667 | } | |
668 | ||
669 | for (addr = perms[i].start; | |
670 | addr < perms[i].end; | |
671 | addr += SECTION_SIZE) | |
672 | section_update(addr, perms[i].mask, | |
673 | set ? perms[i].prot : perms[i].clear, mm); | |
674 | } | |
675 | ||
1e6b4811 KC |
676 | } |
677 | ||
11ce4b33 GS |
678 | /** |
679 | * update_sections_early intended to be called only through stop_machine | |
680 | * framework and executed by only one CPU while all other CPUs will spin and | |
681 | * wait, so no locking is required in this function. | |
682 | */ | |
08925c2f | 683 | static void update_sections_early(struct section_perm perms[], int n) |
1e6b4811 | 684 | { |
08925c2f LA |
685 | struct task_struct *t, *s; |
686 | ||
08925c2f LA |
687 | for_each_process(t) { |
688 | if (t->flags & PF_KTHREAD) | |
689 | continue; | |
690 | for_each_thread(t, s) | |
691 | set_section_perms(perms, n, true, s->mm); | |
692 | } | |
08925c2f LA |
693 | set_section_perms(perms, n, true, current->active_mm); |
694 | set_section_perms(perms, n, true, &init_mm); | |
695 | } | |
696 | ||
11ce4b33 | 697 | static int __fix_kernmem_perms(void *unused) |
08925c2f LA |
698 | { |
699 | update_sections_early(nx_perms, ARRAY_SIZE(nx_perms)); | |
700 | return 0; | |
701 | } | |
702 | ||
11ce4b33 | 703 | static void fix_kernmem_perms(void) |
08925c2f LA |
704 | { |
705 | stop_machine(__fix_kernmem_perms, NULL, NULL); | |
1e6b4811 | 706 | } |
80d6b0c2 | 707 | |
11ce4b33 | 708 | static int __mark_rodata_ro(void *unused) |
08925c2f LA |
709 | { |
710 | update_sections_early(ro_perms, ARRAY_SIZE(ro_perms)); | |
711 | return 0; | |
712 | } | |
713 | ||
b4c7e2bd SRV |
714 | static int kernel_set_to_readonly __read_mostly; |
715 | ||
80d6b0c2 KC |
716 | void mark_rodata_ro(void) |
717 | { | |
b4c7e2bd | 718 | kernel_set_to_readonly = 1; |
08925c2f | 719 | stop_machine(__mark_rodata_ro, NULL, NULL); |
a8e53c15 | 720 | debug_checkwx(); |
80d6b0c2 KC |
721 | } |
722 | ||
723 | void set_kernel_text_rw(void) | |
724 | { | |
b4c7e2bd SRV |
725 | if (!kernel_set_to_readonly) |
726 | return; | |
727 | ||
08925c2f LA |
728 | set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), false, |
729 | current->active_mm); | |
80d6b0c2 KC |
730 | } |
731 | ||
732 | void set_kernel_text_ro(void) | |
733 | { | |
b4c7e2bd SRV |
734 | if (!kernel_set_to_readonly) |
735 | return; | |
736 | ||
08925c2f LA |
737 | set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), true, |
738 | current->active_mm); | |
80d6b0c2 | 739 | } |
80d6b0c2 | 740 | |
1e6b4811 KC |
741 | #else |
742 | static inline void fix_kernmem_perms(void) { } | |
0f5bf6d0 | 743 | #endif /* CONFIG_STRICT_KERNEL_RWX */ |
1e6b4811 | 744 | |
1e6b4811 KC |
745 | void free_initmem(void) |
746 | { | |
747 | fix_kernmem_perms(); | |
bc581770 | 748 | |
54d52573 | 749 | poison_init_mem(__init_begin, __init_end - __init_begin); |
6db015e4 | 750 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
dbe67df4 | 751 | free_initmem_default(-1); |
1da177e4 LT |
752 | } |
753 | ||
754 | #ifdef CONFIG_BLK_DEV_INITRD | |
755 | ||
756 | static int keep_initrd; | |
757 | ||
758 | void free_initrd_mem(unsigned long start, unsigned long end) | |
759 | { | |
54d52573 | 760 | if (!keep_initrd) { |
421520ba YW |
761 | if (start == initrd_start) |
762 | start = round_down(start, PAGE_SIZE); | |
763 | if (end == initrd_end) | |
764 | end = round_up(end, PAGE_SIZE); | |
765 | ||
54d52573 | 766 | poison_init_mem((void *)start, PAGE_ALIGN(end) - start); |
dbe67df4 | 767 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
54d52573 | 768 | } |
1da177e4 LT |
769 | } |
770 | ||
771 | static int __init keepinitrd_setup(char *__unused) | |
772 | { | |
773 | keep_initrd = 1; | |
774 | return 1; | |
775 | } | |
776 | ||
777 | __setup("keepinitrd", keepinitrd_setup); | |
778 | #endif |