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> | |
dc28094b | 16 | #include <linux/export.h> |
1da177e4 LT |
17 | #include <linux/nodemask.h> |
18 | #include <linux/initrd.h> | |
9eb8f674 | 19 | #include <linux/of_fdt.h> |
3835f6cb | 20 | #include <linux/highmem.h> |
5a0e3ad6 | 21 | #include <linux/gfp.h> |
2778f620 | 22 | #include <linux/memblock.h> |
c7909509 | 23 | #include <linux/dma-contiguous.h> |
158e8bfe | 24 | #include <linux/sizes.h> |
08925c2f | 25 | #include <linux/stop_machine.h> |
1da177e4 | 26 | |
b4b20ad8 | 27 | #include <asm/cp15.h> |
1da177e4 | 28 | #include <asm/mach-types.h> |
716a3dc2 | 29 | #include <asm/memblock.h> |
93c02ab4 | 30 | #include <asm/prom.h> |
37efe642 | 31 | #include <asm/sections.h> |
1da177e4 | 32 | #include <asm/setup.h> |
1e6b4811 | 33 | #include <asm/system_info.h> |
1da177e4 | 34 | #include <asm/tlb.h> |
db9ef1af | 35 | #include <asm/fixmap.h> |
1da177e4 LT |
36 | |
37 | #include <asm/mach/arch.h> | |
38 | #include <asm/mach/map.h> | |
39 | ||
1b2e2b73 RK |
40 | #include "mm.h" |
41 | ||
b4b20ad8 RK |
42 | #ifdef CONFIG_CPU_CP15_MMU |
43 | unsigned long __init __clear_cr(unsigned long mask) | |
44 | { | |
b4b20ad8 RK |
45 | cr_alignment = cr_alignment & ~mask; |
46 | return cr_alignment; | |
47 | } | |
48 | #endif | |
49 | ||
de22cc6e | 50 | static phys_addr_t phys_initrd_start __initdata = 0; |
012d1f4a RK |
51 | static unsigned long phys_initrd_size __initdata = 0; |
52 | ||
2b0d8c25 | 53 | static int __init early_initrd(char *p) |
012d1f4a | 54 | { |
de22cc6e VA |
55 | phys_addr_t start; |
56 | unsigned long size; | |
2b0d8c25 | 57 | char *endp; |
012d1f4a | 58 | |
2b0d8c25 JK |
59 | start = memparse(p, &endp); |
60 | if (*endp == ',') { | |
61 | size = memparse(endp + 1, NULL); | |
012d1f4a RK |
62 | |
63 | phys_initrd_start = start; | |
64 | phys_initrd_size = size; | |
65 | } | |
2b0d8c25 | 66 | return 0; |
012d1f4a | 67 | } |
2b0d8c25 | 68 | early_param("initrd", early_initrd); |
012d1f4a RK |
69 | |
70 | static int __init parse_tag_initrd(const struct tag *tag) | |
71 | { | |
4ed89f22 | 72 | pr_warn("ATAG_INITRD is deprecated; " |
012d1f4a RK |
73 | "please update your bootloader.\n"); |
74 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); | |
75 | phys_initrd_size = tag->u.initrd.size; | |
76 | return 0; | |
77 | } | |
78 | ||
79 | __tagtable(ATAG_INITRD, parse_tag_initrd); | |
80 | ||
81 | static int __init parse_tag_initrd2(const struct tag *tag) | |
82 | { | |
83 | phys_initrd_start = tag->u.initrd.start; | |
84 | phys_initrd_size = tag->u.initrd.size; | |
85 | return 0; | |
86 | } | |
87 | ||
88 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); | |
1da177e4 | 89 | |
f25b4b4c | 90 | static void __init find_limits(unsigned long *min, unsigned long *max_low, |
27a3f0e9 | 91 | unsigned long *max_high) |
dde5828f | 92 | { |
1c2f87c2 LA |
93 | *max_low = PFN_DOWN(memblock_get_current_limit()); |
94 | *min = PFN_UP(memblock_start_of_DRAM()); | |
95 | *max_high = PFN_DOWN(memblock_end_of_DRAM()); | |
dde5828f RK |
96 | } |
97 | ||
be20902b | 98 | #ifdef CONFIG_ZONE_DMA |
65032018 | 99 | |
364230b9 | 100 | phys_addr_t arm_dma_zone_size __read_mostly; |
65032018 NP |
101 | EXPORT_SYMBOL(arm_dma_zone_size); |
102 | ||
022ae537 RK |
103 | /* |
104 | * The DMA mask corresponding to the maximum bus address allocatable | |
105 | * using GFP_DMA. The default here places no restriction on DMA | |
106 | * allocations. This must be the smallest DMA mask in the system, | |
107 | * so a successful GFP_DMA allocation will always satisfy this. | |
108 | */ | |
4986e5c7 | 109 | phys_addr_t arm_dma_limit; |
4dcfa600 | 110 | unsigned long arm_dma_pfn_limit; |
022ae537 | 111 | |
be20902b RK |
112 | static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, |
113 | unsigned long dma_size) | |
114 | { | |
115 | if (size[0] <= dma_size) | |
116 | return; | |
117 | ||
118 | size[ZONE_NORMAL] = size[0] - dma_size; | |
119 | size[ZONE_DMA] = dma_size; | |
120 | hole[ZONE_NORMAL] = hole[0]; | |
121 | hole[ZONE_DMA] = 0; | |
122 | } | |
123 | #endif | |
124 | ||
ff69a4c8 | 125 | void __init setup_dma_zone(const struct machine_desc *mdesc) |
c7909509 MS |
126 | { |
127 | #ifdef CONFIG_ZONE_DMA | |
128 | if (mdesc->dma_zone_size) { | |
129 | arm_dma_zone_size = mdesc->dma_zone_size; | |
6bcac805 | 130 | arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; |
c7909509 MS |
131 | } else |
132 | arm_dma_limit = 0xffffffff; | |
4dcfa600 | 133 | arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT; |
c7909509 MS |
134 | #endif |
135 | } | |
136 | ||
84f452b1 | 137 | static void __init zone_sizes_init(unsigned long min, unsigned long max_low, |
a2c54d2a | 138 | unsigned long max_high) |
b7a69ac3 RK |
139 | { |
140 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
a2c54d2a | 141 | struct memblock_region *reg; |
b7a69ac3 | 142 | |
90072059 | 143 | /* |
be370302 | 144 | * initialise the zones. |
90072059 RK |
145 | */ |
146 | memset(zone_size, 0, sizeof(zone_size)); | |
90072059 RK |
147 | |
148 | /* | |
be370302 RK |
149 | * The memory size has already been determined. If we need |
150 | * to do anything fancy with the allocation of this memory | |
151 | * to the zones, now is the time to do it. | |
90072059 | 152 | */ |
dde5828f RK |
153 | zone_size[0] = max_low - min; |
154 | #ifdef CONFIG_HIGHMEM | |
155 | zone_size[ZONE_HIGHMEM] = max_high - max_low; | |
156 | #endif | |
90072059 RK |
157 | |
158 | /* | |
be370302 RK |
159 | * Calculate the size of the holes. |
160 | * holes = node_size - sum(bank_sizes) | |
90072059 | 161 | */ |
dde5828f | 162 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
a2c54d2a RK |
163 | for_each_memblock(memory, reg) { |
164 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
165 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
166 | ||
167 | if (start < max_low) { | |
168 | unsigned long low_end = min(end, max_low); | |
169 | zhole_size[0] -= low_end - start; | |
170 | } | |
dde5828f | 171 | #ifdef CONFIG_HIGHMEM |
a2c54d2a RK |
172 | if (end > max_low) { |
173 | unsigned long high_start = max(start, max_low); | |
174 | zhole_size[ZONE_HIGHMEM] -= end - high_start; | |
175 | } | |
dde5828f | 176 | #endif |
dde5828f | 177 | } |
90072059 | 178 | |
65032018 | 179 | #ifdef CONFIG_ZONE_DMA |
90072059 RK |
180 | /* |
181 | * Adjust the sizes according to any special requirements for | |
182 | * this machine type. | |
183 | */ | |
c7909509 | 184 | if (arm_dma_zone_size) |
65032018 NP |
185 | arm_adjust_dma_zone(zone_size, zhole_size, |
186 | arm_dma_zone_size >> PAGE_SHIFT); | |
be20902b | 187 | #endif |
90072059 | 188 | |
be370302 | 189 | free_area_init_node(0, zone_size, min, zhole_size); |
1da177e4 LT |
190 | } |
191 | ||
7b7bf499 | 192 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
b7cfda9f RK |
193 | int pfn_valid(unsigned long pfn) |
194 | { | |
09414d00 | 195 | return memblock_is_map_memory(__pfn_to_phys(pfn)); |
b7cfda9f RK |
196 | } |
197 | EXPORT_SYMBOL(pfn_valid); | |
7b7bf499 | 198 | #endif |
657e12fd | 199 | |
7b7bf499 | 200 | #ifndef CONFIG_SPARSEMEM |
14904927 | 201 | static void __init arm_memory_present(void) |
657e12fd RK |
202 | { |
203 | } | |
204 | #else | |
14904927 | 205 | static void __init arm_memory_present(void) |
657e12fd | 206 | { |
719c1514 | 207 | struct memblock_region *reg; |
719c1514 | 208 | |
7c996361 | 209 | for_each_memblock(memory, reg) |
c7fc2de0 YL |
210 | memory_present(0, memblock_region_memory_base_pfn(reg), |
211 | memblock_region_memory_end_pfn(reg)); | |
657e12fd | 212 | } |
b7cfda9f RK |
213 | #endif |
214 | ||
716a3dc2 RK |
215 | static bool arm_memblock_steal_permitted = true; |
216 | ||
bc2827d0 | 217 | phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) |
716a3dc2 RK |
218 | { |
219 | phys_addr_t phys; | |
220 | ||
221 | BUG_ON(!arm_memblock_steal_permitted); | |
222 | ||
7ac68a4c | 223 | phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); |
716a3dc2 RK |
224 | memblock_free(phys, size); |
225 | memblock_remove(phys, size); | |
226 | ||
227 | return phys; | |
228 | } | |
229 | ||
1c2f87c2 | 230 | void __init arm_memblock_init(const struct machine_desc *mdesc) |
2778f620 | 231 | { |
2778f620 RK |
232 | /* Register the kernel text, kernel data and initrd with memblock. */ |
233 | #ifdef CONFIG_XIP_KERNEL | |
842eab40 | 234 | memblock_reserve(__pa(_sdata), _end - _sdata); |
2778f620 RK |
235 | #else |
236 | memblock_reserve(__pa(_stext), _end - _stext); | |
237 | #endif | |
238 | #ifdef CONFIG_BLK_DEV_INITRD | |
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 | } | |
4c235cb9 | 244 | initrd_start = initrd_end = 0; |
8f4b8c76 RK |
245 | if (phys_initrd_size && |
246 | !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { | |
de22cc6e VA |
247 | pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", |
248 | (u64)phys_initrd_start, phys_initrd_size); | |
8f4b8c76 RK |
249 | phys_initrd_start = phys_initrd_size = 0; |
250 | } | |
b0a2679d RK |
251 | if (phys_initrd_size && |
252 | memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { | |
de22cc6e VA |
253 | pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", |
254 | (u64)phys_initrd_start, phys_initrd_size); | |
b0a2679d RK |
255 | phys_initrd_start = phys_initrd_size = 0; |
256 | } | |
2778f620 RK |
257 | if (phys_initrd_size) { |
258 | memblock_reserve(phys_initrd_start, phys_initrd_size); | |
259 | ||
260 | /* Now convert initrd to virtual addresses */ | |
261 | initrd_start = __phys_to_virt(phys_initrd_start); | |
262 | initrd_end = initrd_start + phys_initrd_size; | |
263 | } | |
264 | #endif | |
265 | ||
266 | arm_mm_memblock_reserve(); | |
267 | ||
8d717a52 RK |
268 | /* reserve any platform specific memblock areas */ |
269 | if (mdesc->reserve) | |
270 | mdesc->reserve(); | |
271 | ||
24bbd929 | 272 | early_init_fdt_reserve_self(); |
bcedb5f9 MS |
273 | early_init_fdt_scan_reserved_mem(); |
274 | ||
99a468d7 | 275 | /* reserve memory for DMA contiguous allocations */ |
95b0e655 | 276 | dma_contiguous_reserve(arm_dma_limit); |
c7909509 | 277 | |
716a3dc2 | 278 | arm_memblock_steal_permitted = false; |
2778f620 RK |
279 | memblock_dump_all(); |
280 | } | |
281 | ||
8d717a52 | 282 | void __init bootmem_init(void) |
1da177e4 | 283 | { |
dde5828f | 284 | unsigned long min, max_low, max_high; |
1da177e4 | 285 | |
8e58caef | 286 | memblock_allow_resize(); |
dde5828f RK |
287 | max_low = max_high = 0; |
288 | ||
f25b4b4c | 289 | find_limits(&min, &max_low, &max_high); |
dde5828f | 290 | |
d30eae47 VM |
291 | early_memtest((phys_addr_t)min << PAGE_SHIFT, |
292 | (phys_addr_t)max_low << PAGE_SHIFT); | |
293 | ||
be370302 RK |
294 | /* |
295 | * Sparsemem tries to allocate bootmem in memory_present(), | |
296 | * so must be done after the fixed reservations | |
297 | */ | |
eda2e5dc | 298 | arm_memory_present(); |
1da177e4 | 299 | |
b7a69ac3 RK |
300 | /* |
301 | * sparse_init() needs the bootmem allocator up and running. | |
302 | */ | |
303 | sparse_init(); | |
304 | ||
305 | /* | |
be370302 | 306 | * Now free the memory - free_area_init_node needs |
b7a69ac3 RK |
307 | * the sparse mem_map arrays initialized by sparse_init() |
308 | * for memmap_init_zone(), otherwise all PFNs are invalid. | |
309 | */ | |
84f452b1 | 310 | zone_sizes_init(min, max_low, max_high); |
b7a69ac3 | 311 | |
90072059 RK |
312 | /* |
313 | * This doesn't seem to be used by the Linux memory manager any | |
314 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
315 | * also get rid of some of the stuff above as well. | |
90072059 | 316 | */ |
26ba47b1 SS |
317 | min_low_pfn = min; |
318 | max_low_pfn = max_low; | |
319 | max_pfn = max_high; | |
90072059 | 320 | } |
1da177e4 | 321 | |
54d52573 SB |
322 | /* |
323 | * Poison init memory with an undefined instruction (ARM) or a branch to an | |
324 | * undefined instruction (Thumb). | |
325 | */ | |
326 | static inline void poison_init_mem(void *s, size_t count) | |
327 | { | |
328 | u32 *p = (u32 *)s; | |
bf912d99 | 329 | for (; count != 0; count -= 4) |
54d52573 SB |
330 | *p++ = 0xe7fddef0; |
331 | } | |
332 | ||
a013053d | 333 | static inline void |
be370302 | 334 | free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
a013053d RK |
335 | { |
336 | struct page *start_pg, *end_pg; | |
56bc6286 | 337 | phys_addr_t pg, pgend; |
a013053d RK |
338 | |
339 | /* | |
340 | * Convert start_pfn/end_pfn to a struct page pointer. | |
341 | */ | |
3257f43d | 342 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
9af386c8 | 343 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
a013053d RK |
344 | |
345 | /* | |
346 | * Convert to physical addresses, and | |
347 | * round start upwards and end downwards. | |
348 | */ | |
56bc6286 VA |
349 | pg = PAGE_ALIGN(__pa(start_pg)); |
350 | pgend = __pa(end_pg) & PAGE_MASK; | |
a013053d RK |
351 | |
352 | /* | |
353 | * If there are free pages between these, | |
354 | * free the section of the memmap array. | |
355 | */ | |
356 | if (pg < pgend) | |
cfb66586 | 357 | memblock_free_early(pg, pgend - pg); |
a013053d RK |
358 | } |
359 | ||
360 | /* | |
361 | * The mem_map array can get very big. Free the unused area of the memory map. | |
362 | */ | |
1c2f87c2 | 363 | static void __init free_unused_memmap(void) |
a013053d | 364 | { |
1c2f87c2 LA |
365 | unsigned long start, prev_end = 0; |
366 | struct memblock_region *reg; | |
a013053d RK |
367 | |
368 | /* | |
3260e529 MB |
369 | * This relies on each bank being in address order. |
370 | * The banks are sorted previously in bootmem_init(). | |
a013053d | 371 | */ |
1c2f87c2 LA |
372 | for_each_memblock(memory, reg) { |
373 | start = memblock_region_memory_base_pfn(reg); | |
a013053d | 374 | |
9af386c8 WD |
375 | #ifdef CONFIG_SPARSEMEM |
376 | /* | |
377 | * Take care not to free memmap entries that don't exist | |
378 | * due to SPARSEMEM sections which aren't present. | |
379 | */ | |
1c2f87c2 LA |
380 | start = min(start, |
381 | ALIGN(prev_end, PAGES_PER_SECTION)); | |
002ea9ee LW |
382 | #else |
383 | /* | |
384 | * Align down here since the VM subsystem insists that the | |
385 | * memmap entries are valid from the bank start aligned to | |
386 | * MAX_ORDER_NR_PAGES. | |
387 | */ | |
1c2f87c2 | 388 | start = round_down(start, MAX_ORDER_NR_PAGES); |
9af386c8 | 389 | #endif |
a013053d RK |
390 | /* |
391 | * If we had a previous bank, and there is a space | |
392 | * between the current bank and the previous, free it. | |
393 | */ | |
1c2f87c2 LA |
394 | if (prev_end && prev_end < start) |
395 | free_memmap(prev_end, start); | |
a013053d | 396 | |
3260e529 MB |
397 | /* |
398 | * Align up here since the VM subsystem insists that the | |
399 | * memmap entries are valid from the bank end aligned to | |
400 | * MAX_ORDER_NR_PAGES. | |
401 | */ | |
1c2f87c2 LA |
402 | prev_end = ALIGN(memblock_region_memory_end_pfn(reg), |
403 | MAX_ORDER_NR_PAGES); | |
a013053d | 404 | } |
9af386c8 WD |
405 | |
406 | #ifdef CONFIG_SPARSEMEM | |
1c2f87c2 LA |
407 | if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) |
408 | free_memmap(prev_end, | |
409 | ALIGN(prev_end, PAGES_PER_SECTION)); | |
9af386c8 | 410 | #endif |
a013053d RK |
411 | } |
412 | ||
83db0384 JL |
413 | #ifdef CONFIG_HIGHMEM |
414 | static inline void free_area_high(unsigned long pfn, unsigned long end) | |
415 | { | |
dd6911ef JL |
416 | for (; pfn < end; pfn++) |
417 | free_highmem_page(pfn_to_page(pfn)); | |
83db0384 JL |
418 | } |
419 | #endif | |
420 | ||
d0e775af RK |
421 | static void __init free_highpages(void) |
422 | { | |
423 | #ifdef CONFIG_HIGHMEM | |
26ba47b1 | 424 | unsigned long max_low = max_low_pfn; |
df4f14c7 | 425 | struct memblock_region *mem, *res; |
d0e775af RK |
426 | |
427 | /* set highmem page free */ | |
df4f14c7 RK |
428 | for_each_memblock(memory, mem) { |
429 | unsigned long start = memblock_region_memory_base_pfn(mem); | |
430 | unsigned long end = memblock_region_memory_end_pfn(mem); | |
431 | ||
432 | /* Ignore complete lowmem entries */ | |
433 | if (end <= max_low) | |
434 | continue; | |
435 | ||
09414d00 AB |
436 | if (memblock_is_nomap(mem)) |
437 | continue; | |
438 | ||
df4f14c7 RK |
439 | /* Truncate partial highmem entries */ |
440 | if (start < max_low) | |
441 | start = max_low; | |
442 | ||
443 | /* Find and exclude any reserved regions */ | |
444 | for_each_memblock(reserved, res) { | |
445 | unsigned long res_start, res_end; | |
446 | ||
447 | res_start = memblock_region_reserved_base_pfn(res); | |
448 | res_end = memblock_region_reserved_end_pfn(res); | |
449 | ||
450 | if (res_end < start) | |
451 | continue; | |
452 | if (res_start < start) | |
453 | res_start = start; | |
454 | if (res_start > end) | |
455 | res_start = end; | |
456 | if (res_end > end) | |
457 | res_end = end; | |
458 | if (res_start != start) | |
83db0384 | 459 | free_area_high(start, res_start); |
df4f14c7 RK |
460 | start = res_end; |
461 | if (start == end) | |
462 | break; | |
463 | } | |
464 | ||
465 | /* And now free anything which remains */ | |
466 | if (start < end) | |
83db0384 | 467 | free_area_high(start, end); |
d0e775af | 468 | } |
d0e775af RK |
469 | #endif |
470 | } | |
471 | ||
1da177e4 LT |
472 | /* |
473 | * mem_init() marks the free areas in the mem_map and tells us how much | |
474 | * memory is free. This is done after various parts of the system have | |
475 | * claimed their memory after the kernel image. | |
476 | */ | |
477 | void __init mem_init(void) | |
478 | { | |
1dbd30e9 LW |
479 | #ifdef CONFIG_HAVE_TCM |
480 | /* These pointers are filled in on TCM detection */ | |
481 | extern u32 dtcm_end; | |
482 | extern u32 itcm_end; | |
483 | #endif | |
1da177e4 | 484 | |
b3ba41f2 | 485 | set_max_mapnr(pfn_to_page(max_pfn) - mem_map); |
1da177e4 | 486 | |
1da177e4 | 487 | /* this will put all unused low memory onto the freelists */ |
1c2f87c2 | 488 | free_unused_memmap(); |
0c988534 | 489 | free_all_bootmem(); |
1da177e4 LT |
490 | |
491 | #ifdef CONFIG_SA1111 | |
492 | /* now that our DMA memory is actually so designated, we can free it */ | |
bfd65dd9 | 493 | free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); |
1da177e4 LT |
494 | #endif |
495 | ||
d0e775af | 496 | free_highpages(); |
3835f6cb | 497 | |
2450c973 | 498 | mem_init_print_info(NULL); |
1da177e4 | 499 | |
db9ef1af FB |
500 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
501 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
502 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
503 | ||
4ed89f22 | 504 | pr_notice("Virtual kernel memory layout:\n" |
db9ef1af | 505 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 506 | #ifdef CONFIG_HAVE_TCM |
07d2a5c7 | 507 | " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 508 | " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 509 | #endif |
db9ef1af FB |
510 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
511 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
512 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
513 | #ifdef CONFIG_HIGHMEM | |
514 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
515 | #endif | |
d9277d51 | 516 | #ifdef CONFIG_MODULES |
db9ef1af | 517 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" |
d9277d51 | 518 | #endif |
178c3dfe RK |
519 | " .text : 0x%p" " - 0x%p" " (%4td kB)\n" |
520 | " .init : 0x%p" " - 0x%p" " (%4td kB)\n" | |
521 | " .data : 0x%p" " - 0x%p" " (%4td kB)\n" | |
522 | " .bss : 0x%p" " - 0x%p" " (%4td kB)\n", | |
db9ef1af FB |
523 | |
524 | MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + | |
525 | (PAGE_SIZE)), | |
07d2a5c7 | 526 | #ifdef CONFIG_HAVE_TCM |
1dbd30e9 LW |
527 | MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
528 | MLK(ITCM_OFFSET, (unsigned long) itcm_end), | |
07d2a5c7 | 529 | #endif |
b615bbbf | 530 | MLK(FIXADDR_START, FIXADDR_END), |
c931b4f6 | 531 | MLM(VMALLOC_START, VMALLOC_END), |
db9ef1af FB |
532 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
533 | #ifdef CONFIG_HIGHMEM | |
534 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * | |
535 | (PAGE_SIZE)), | |
536 | #endif | |
d9277d51 | 537 | #ifdef CONFIG_MODULES |
db9ef1af | 538 | MLM(MODULES_VADDR, MODULES_END), |
d9277d51 | 539 | #endif |
db9ef1af | 540 | |
db9ef1af | 541 | MLK_ROUNDUP(_text, _etext), |
3835d69a | 542 | MLK_ROUNDUP(__init_begin, __init_end), |
45f6d7e0 RV |
543 | MLK_ROUNDUP(_sdata, _edata), |
544 | MLK_ROUNDUP(__bss_start, __bss_stop)); | |
db9ef1af FB |
545 | |
546 | #undef MLK | |
547 | #undef MLM | |
548 | #undef MLK_ROUNDUP | |
549 | ||
a1839272 FB |
550 | /* |
551 | * Check boundaries twice: Some fundamental inconsistencies can | |
552 | * be detected at build time already. | |
553 | */ | |
554 | #ifdef CONFIG_MMU | |
a1839272 FB |
555 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
556 | BUG_ON(TASK_SIZE > MODULES_VADDR); | |
557 | #endif | |
558 | ||
559 | #ifdef CONFIG_HIGHMEM | |
560 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
561 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
562 | #endif | |
563 | ||
2450c973 | 564 | if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { |
1da177e4 LT |
565 | extern int sysctl_overcommit_memory; |
566 | /* | |
567 | * On a machine this small we won't get | |
568 | * anywhere without overcommit, so turn | |
569 | * it on by default. | |
570 | */ | |
571 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
572 | } | |
573 | } | |
574 | ||
25362dc4 | 575 | #ifdef CONFIG_DEBUG_RODATA |
1e6b4811 | 576 | struct section_perm { |
25362dc4 | 577 | const char *name; |
1e6b4811 KC |
578 | unsigned long start; |
579 | unsigned long end; | |
580 | pmdval_t mask; | |
581 | pmdval_t prot; | |
80d6b0c2 | 582 | pmdval_t clear; |
1e6b4811 KC |
583 | }; |
584 | ||
64ac2e74 KC |
585 | /* First section-aligned location at or after __start_rodata. */ |
586 | extern char __start_rodata_section_aligned[]; | |
587 | ||
80d6b0c2 | 588 | static struct section_perm nx_perms[] = { |
1e6b4811 KC |
589 | /* Make pages tables, etc before _stext RW (set NX). */ |
590 | { | |
25362dc4 | 591 | .name = "pre-text NX", |
1e6b4811 KC |
592 | .start = PAGE_OFFSET, |
593 | .end = (unsigned long)_stext, | |
594 | .mask = ~PMD_SECT_XN, | |
595 | .prot = PMD_SECT_XN, | |
596 | }, | |
597 | /* Make init RW (set NX). */ | |
598 | { | |
25362dc4 | 599 | .name = "init NX", |
1e6b4811 KC |
600 | .start = (unsigned long)__init_begin, |
601 | .end = (unsigned long)_sdata, | |
602 | .mask = ~PMD_SECT_XN, | |
603 | .prot = PMD_SECT_XN, | |
604 | }, | |
80d6b0c2 KC |
605 | /* Make rodata NX (set RO in ro_perms below). */ |
606 | { | |
25362dc4 | 607 | .name = "rodata NX", |
64ac2e74 | 608 | .start = (unsigned long)__start_rodata_section_aligned, |
80d6b0c2 KC |
609 | .end = (unsigned long)__init_begin, |
610 | .mask = ~PMD_SECT_XN, | |
611 | .prot = PMD_SECT_XN, | |
612 | }, | |
1e6b4811 KC |
613 | }; |
614 | ||
80d6b0c2 KC |
615 | static struct section_perm ro_perms[] = { |
616 | /* Make kernel code and rodata RX (set RO). */ | |
617 | { | |
25362dc4 | 618 | .name = "text/rodata RO", |
80d6b0c2 KC |
619 | .start = (unsigned long)_stext, |
620 | .end = (unsigned long)__init_begin, | |
621 | #ifdef CONFIG_ARM_LPAE | |
1e347922 VK |
622 | .mask = ~L_PMD_SECT_RDONLY, |
623 | .prot = L_PMD_SECT_RDONLY, | |
80d6b0c2 KC |
624 | #else |
625 | .mask = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE), | |
626 | .prot = PMD_SECT_APX | PMD_SECT_AP_WRITE, | |
627 | .clear = PMD_SECT_AP_WRITE, | |
628 | #endif | |
629 | }, | |
630 | }; | |
80d6b0c2 | 631 | |
1e6b4811 KC |
632 | /* |
633 | * Updates section permissions only for the current mm (sections are | |
634 | * copied into each mm). During startup, this is the init_mm. Is only | |
635 | * safe to be called with preemption disabled, as under stop_machine(). | |
636 | */ | |
637 | static inline void section_update(unsigned long addr, pmdval_t mask, | |
08925c2f | 638 | pmdval_t prot, struct mm_struct *mm) |
1e6b4811 | 639 | { |
1e6b4811 KC |
640 | pmd_t *pmd; |
641 | ||
1e6b4811 KC |
642 | pmd = pmd_offset(pud_offset(pgd_offset(mm, addr), addr), addr); |
643 | ||
644 | #ifdef CONFIG_ARM_LPAE | |
645 | pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); | |
646 | #else | |
647 | if (addr & SECTION_SIZE) | |
648 | pmd[1] = __pmd((pmd_val(pmd[1]) & mask) | prot); | |
649 | else | |
650 | pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); | |
651 | #endif | |
652 | flush_pmd_entry(pmd); | |
653 | local_flush_tlb_kernel_range(addr, addr + SECTION_SIZE); | |
654 | } | |
655 | ||
656 | /* Make sure extended page tables are in use. */ | |
657 | static inline bool arch_has_strict_perms(void) | |
658 | { | |
659 | if (cpu_architecture() < CPU_ARCH_ARMv6) | |
660 | return false; | |
661 | ||
662 | return !!(get_cr() & CR_XP); | |
663 | } | |
664 | ||
08925c2f LA |
665 | void set_section_perms(struct section_perm *perms, int n, bool set, |
666 | struct mm_struct *mm) | |
667 | { | |
668 | size_t i; | |
669 | unsigned long addr; | |
670 | ||
671 | if (!arch_has_strict_perms()) | |
672 | return; | |
673 | ||
674 | for (i = 0; i < n; i++) { | |
675 | if (!IS_ALIGNED(perms[i].start, SECTION_SIZE) || | |
676 | !IS_ALIGNED(perms[i].end, SECTION_SIZE)) { | |
25362dc4 KC |
677 | pr_err("BUG: %s section %lx-%lx not aligned to %lx\n", |
678 | perms[i].name, perms[i].start, perms[i].end, | |
08925c2f LA |
679 | SECTION_SIZE); |
680 | continue; | |
681 | } | |
682 | ||
683 | for (addr = perms[i].start; | |
684 | addr < perms[i].end; | |
685 | addr += SECTION_SIZE) | |
686 | section_update(addr, perms[i].mask, | |
687 | set ? perms[i].prot : perms[i].clear, mm); | |
688 | } | |
689 | ||
1e6b4811 KC |
690 | } |
691 | ||
08925c2f | 692 | static void update_sections_early(struct section_perm perms[], int n) |
1e6b4811 | 693 | { |
08925c2f LA |
694 | struct task_struct *t, *s; |
695 | ||
696 | read_lock(&tasklist_lock); | |
697 | for_each_process(t) { | |
698 | if (t->flags & PF_KTHREAD) | |
699 | continue; | |
700 | for_each_thread(t, s) | |
701 | set_section_perms(perms, n, true, s->mm); | |
702 | } | |
703 | read_unlock(&tasklist_lock); | |
704 | set_section_perms(perms, n, true, current->active_mm); | |
705 | set_section_perms(perms, n, true, &init_mm); | |
706 | } | |
707 | ||
708 | int __fix_kernmem_perms(void *unused) | |
709 | { | |
710 | update_sections_early(nx_perms, ARRAY_SIZE(nx_perms)); | |
711 | return 0; | |
712 | } | |
713 | ||
714 | void fix_kernmem_perms(void) | |
715 | { | |
716 | stop_machine(__fix_kernmem_perms, NULL, NULL); | |
1e6b4811 | 717 | } |
80d6b0c2 | 718 | |
08925c2f LA |
719 | int __mark_rodata_ro(void *unused) |
720 | { | |
721 | update_sections_early(ro_perms, ARRAY_SIZE(ro_perms)); | |
722 | return 0; | |
723 | } | |
724 | ||
80d6b0c2 KC |
725 | void mark_rodata_ro(void) |
726 | { | |
08925c2f | 727 | stop_machine(__mark_rodata_ro, NULL, NULL); |
80d6b0c2 KC |
728 | } |
729 | ||
730 | void set_kernel_text_rw(void) | |
731 | { | |
08925c2f LA |
732 | set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), false, |
733 | current->active_mm); | |
80d6b0c2 KC |
734 | } |
735 | ||
736 | void set_kernel_text_ro(void) | |
737 | { | |
08925c2f LA |
738 | set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), true, |
739 | current->active_mm); | |
80d6b0c2 | 740 | } |
80d6b0c2 | 741 | |
1e6b4811 KC |
742 | #else |
743 | static inline void fix_kernmem_perms(void) { } | |
25362dc4 | 744 | #endif /* CONFIG_DEBUG_RODATA */ |
1e6b4811 KC |
745 | |
746 | void free_tcmmem(void) | |
1da177e4 | 747 | { |
bc581770 | 748 | #ifdef CONFIG_HAVE_TCM |
ea208f64 | 749 | extern char __tcm_start, __tcm_end; |
bc581770 | 750 | |
54d52573 | 751 | poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); |
dbe67df4 | 752 | free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); |
bc581770 | 753 | #endif |
1e6b4811 KC |
754 | } |
755 | ||
756 | void free_initmem(void) | |
757 | { | |
758 | fix_kernmem_perms(); | |
759 | free_tcmmem(); | |
bc581770 | 760 | |
54d52573 | 761 | poison_init_mem(__init_begin, __init_end - __init_begin); |
6db015e4 | 762 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
dbe67df4 | 763 | free_initmem_default(-1); |
1da177e4 LT |
764 | } |
765 | ||
766 | #ifdef CONFIG_BLK_DEV_INITRD | |
767 | ||
768 | static int keep_initrd; | |
769 | ||
770 | void free_initrd_mem(unsigned long start, unsigned long end) | |
771 | { | |
54d52573 | 772 | if (!keep_initrd) { |
421520ba YW |
773 | if (start == initrd_start) |
774 | start = round_down(start, PAGE_SIZE); | |
775 | if (end == initrd_end) | |
776 | end = round_up(end, PAGE_SIZE); | |
777 | ||
54d52573 | 778 | poison_init_mem((void *)start, PAGE_ALIGN(end) - start); |
dbe67df4 | 779 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
54d52573 | 780 | } |
1da177e4 LT |
781 | } |
782 | ||
783 | static int __init keepinitrd_setup(char *__unused) | |
784 | { | |
785 | keep_initrd = 1; | |
786 | return 1; | |
787 | } | |
788 | ||
789 | __setup("keepinitrd", keepinitrd_setup); | |
790 | #endif |