Commit | Line | Data |
---|---|---|
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> |
1da177e4 | 25 | |
b4b20ad8 | 26 | #include <asm/cp15.h> |
1da177e4 | 27 | #include <asm/mach-types.h> |
716a3dc2 | 28 | #include <asm/memblock.h> |
93c02ab4 | 29 | #include <asm/prom.h> |
37efe642 | 30 | #include <asm/sections.h> |
1da177e4 | 31 | #include <asm/setup.h> |
1e6b4811 | 32 | #include <asm/system_info.h> |
1da177e4 | 33 | #include <asm/tlb.h> |
db9ef1af | 34 | #include <asm/fixmap.h> |
1da177e4 LT |
35 | |
36 | #include <asm/mach/arch.h> | |
37 | #include <asm/mach/map.h> | |
38 | ||
1b2e2b73 RK |
39 | #include "mm.h" |
40 | ||
b4b20ad8 RK |
41 | #ifdef CONFIG_CPU_CP15_MMU |
42 | unsigned long __init __clear_cr(unsigned long mask) | |
43 | { | |
b4b20ad8 RK |
44 | cr_alignment = cr_alignment & ~mask; |
45 | return cr_alignment; | |
46 | } | |
47 | #endif | |
48 | ||
de22cc6e | 49 | static phys_addr_t phys_initrd_start __initdata = 0; |
012d1f4a RK |
50 | static unsigned long phys_initrd_size __initdata = 0; |
51 | ||
2b0d8c25 | 52 | static int __init early_initrd(char *p) |
012d1f4a | 53 | { |
de22cc6e VA |
54 | phys_addr_t start; |
55 | unsigned long size; | |
2b0d8c25 | 56 | char *endp; |
012d1f4a | 57 | |
2b0d8c25 JK |
58 | start = memparse(p, &endp); |
59 | if (*endp == ',') { | |
60 | size = memparse(endp + 1, NULL); | |
012d1f4a RK |
61 | |
62 | phys_initrd_start = start; | |
63 | phys_initrd_size = size; | |
64 | } | |
2b0d8c25 | 65 | return 0; |
012d1f4a | 66 | } |
2b0d8c25 | 67 | early_param("initrd", early_initrd); |
012d1f4a RK |
68 | |
69 | static int __init parse_tag_initrd(const struct tag *tag) | |
70 | { | |
4ed89f22 | 71 | pr_warn("ATAG_INITRD is deprecated; " |
012d1f4a RK |
72 | "please update your bootloader.\n"); |
73 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); | |
74 | phys_initrd_size = tag->u.initrd.size; | |
75 | return 0; | |
76 | } | |
77 | ||
78 | __tagtable(ATAG_INITRD, parse_tag_initrd); | |
79 | ||
80 | static int __init parse_tag_initrd2(const struct tag *tag) | |
81 | { | |
82 | phys_initrd_start = tag->u.initrd.start; | |
83 | phys_initrd_size = tag->u.initrd.size; | |
84 | return 0; | |
85 | } | |
86 | ||
87 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); | |
1da177e4 LT |
88 | |
89 | /* | |
4b5f32ce NP |
90 | * This keeps memory configuration data used by a couple memory |
91 | * initialization functions, as well as show_mem() for the skipping | |
92 | * of holes in the memory map. It is populated by arm_add_memory(). | |
1da177e4 | 93 | */ |
b2b755b5 | 94 | void show_mem(unsigned int filter) |
1da177e4 LT |
95 | { |
96 | int free = 0, total = 0, reserved = 0; | |
1c2f87c2 LA |
97 | int shared = 0, cached = 0, slab = 0; |
98 | struct memblock_region *reg; | |
1da177e4 LT |
99 | |
100 | printk("Mem-info:\n"); | |
7bf02ea2 | 101 | show_free_areas(filter); |
be370302 | 102 | |
1c2f87c2 | 103 | for_each_memblock (memory, reg) { |
be370302 RK |
104 | unsigned int pfn1, pfn2; |
105 | struct page *page, *end; | |
106 | ||
1c2f87c2 LA |
107 | pfn1 = memblock_region_memory_base_pfn(reg); |
108 | pfn2 = memblock_region_memory_end_pfn(reg); | |
be370302 RK |
109 | |
110 | page = pfn_to_page(pfn1); | |
111 | end = pfn_to_page(pfn2 - 1) + 1; | |
112 | ||
113 | do { | |
114 | total++; | |
115 | if (PageReserved(page)) | |
116 | reserved++; | |
117 | else if (PageSwapCache(page)) | |
118 | cached++; | |
119 | else if (PageSlab(page)) | |
120 | slab++; | |
121 | else if (!page_count(page)) | |
122 | free++; | |
123 | else | |
124 | shared += page_count(page) - 1; | |
1c2f87c2 LA |
125 | pfn1++; |
126 | page = pfn_to_page(pfn1); | |
127 | } while (pfn1 < pfn2); | |
1da177e4 LT |
128 | } |
129 | ||
130 | printk("%d pages of RAM\n", total); | |
131 | printk("%d free pages\n", free); | |
132 | printk("%d reserved pages\n", reserved); | |
133 | printk("%d slab pages\n", slab); | |
134 | printk("%d pages shared\n", shared); | |
135 | printk("%d pages swap cached\n", cached); | |
136 | } | |
137 | ||
f25b4b4c | 138 | static void __init find_limits(unsigned long *min, unsigned long *max_low, |
27a3f0e9 | 139 | unsigned long *max_high) |
dde5828f | 140 | { |
1c2f87c2 LA |
141 | *max_low = PFN_DOWN(memblock_get_current_limit()); |
142 | *min = PFN_UP(memblock_start_of_DRAM()); | |
143 | *max_high = PFN_DOWN(memblock_end_of_DRAM()); | |
dde5828f RK |
144 | } |
145 | ||
be20902b | 146 | #ifdef CONFIG_ZONE_DMA |
65032018 | 147 | |
364230b9 | 148 | phys_addr_t arm_dma_zone_size __read_mostly; |
65032018 NP |
149 | EXPORT_SYMBOL(arm_dma_zone_size); |
150 | ||
022ae537 RK |
151 | /* |
152 | * The DMA mask corresponding to the maximum bus address allocatable | |
153 | * using GFP_DMA. The default here places no restriction on DMA | |
154 | * allocations. This must be the smallest DMA mask in the system, | |
155 | * so a successful GFP_DMA allocation will always satisfy this. | |
156 | */ | |
4986e5c7 | 157 | phys_addr_t arm_dma_limit; |
4dcfa600 | 158 | unsigned long arm_dma_pfn_limit; |
022ae537 | 159 | |
be20902b RK |
160 | static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, |
161 | unsigned long dma_size) | |
162 | { | |
163 | if (size[0] <= dma_size) | |
164 | return; | |
165 | ||
166 | size[ZONE_NORMAL] = size[0] - dma_size; | |
167 | size[ZONE_DMA] = dma_size; | |
168 | hole[ZONE_NORMAL] = hole[0]; | |
169 | hole[ZONE_DMA] = 0; | |
170 | } | |
171 | #endif | |
172 | ||
ff69a4c8 | 173 | void __init setup_dma_zone(const struct machine_desc *mdesc) |
c7909509 MS |
174 | { |
175 | #ifdef CONFIG_ZONE_DMA | |
176 | if (mdesc->dma_zone_size) { | |
177 | arm_dma_zone_size = mdesc->dma_zone_size; | |
6bcac805 | 178 | arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; |
c7909509 MS |
179 | } else |
180 | arm_dma_limit = 0xffffffff; | |
4dcfa600 | 181 | arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT; |
c7909509 MS |
182 | #endif |
183 | } | |
184 | ||
84f452b1 | 185 | static void __init zone_sizes_init(unsigned long min, unsigned long max_low, |
a2c54d2a | 186 | unsigned long max_high) |
b7a69ac3 RK |
187 | { |
188 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
a2c54d2a | 189 | struct memblock_region *reg; |
b7a69ac3 | 190 | |
90072059 | 191 | /* |
be370302 | 192 | * initialise the zones. |
90072059 RK |
193 | */ |
194 | memset(zone_size, 0, sizeof(zone_size)); | |
90072059 RK |
195 | |
196 | /* | |
be370302 RK |
197 | * The memory size has already been determined. If we need |
198 | * to do anything fancy with the allocation of this memory | |
199 | * to the zones, now is the time to do it. | |
90072059 | 200 | */ |
dde5828f RK |
201 | zone_size[0] = max_low - min; |
202 | #ifdef CONFIG_HIGHMEM | |
203 | zone_size[ZONE_HIGHMEM] = max_high - max_low; | |
204 | #endif | |
90072059 RK |
205 | |
206 | /* | |
be370302 RK |
207 | * Calculate the size of the holes. |
208 | * holes = node_size - sum(bank_sizes) | |
90072059 | 209 | */ |
dde5828f | 210 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
a2c54d2a RK |
211 | for_each_memblock(memory, reg) { |
212 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
213 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
214 | ||
215 | if (start < max_low) { | |
216 | unsigned long low_end = min(end, max_low); | |
217 | zhole_size[0] -= low_end - start; | |
218 | } | |
dde5828f | 219 | #ifdef CONFIG_HIGHMEM |
a2c54d2a RK |
220 | if (end > max_low) { |
221 | unsigned long high_start = max(start, max_low); | |
222 | zhole_size[ZONE_HIGHMEM] -= end - high_start; | |
223 | } | |
dde5828f | 224 | #endif |
dde5828f | 225 | } |
90072059 | 226 | |
65032018 | 227 | #ifdef CONFIG_ZONE_DMA |
90072059 RK |
228 | /* |
229 | * Adjust the sizes according to any special requirements for | |
230 | * this machine type. | |
231 | */ | |
c7909509 | 232 | if (arm_dma_zone_size) |
65032018 NP |
233 | arm_adjust_dma_zone(zone_size, zhole_size, |
234 | arm_dma_zone_size >> PAGE_SHIFT); | |
be20902b | 235 | #endif |
90072059 | 236 | |
be370302 | 237 | free_area_init_node(0, zone_size, min, zhole_size); |
1da177e4 LT |
238 | } |
239 | ||
7b7bf499 | 240 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
b7cfda9f RK |
241 | int pfn_valid(unsigned long pfn) |
242 | { | |
fb492c91 | 243 | return memblock_is_memory(__pfn_to_phys(pfn)); |
b7cfda9f RK |
244 | } |
245 | EXPORT_SYMBOL(pfn_valid); | |
7b7bf499 | 246 | #endif |
657e12fd | 247 | |
7b7bf499 | 248 | #ifndef CONFIG_SPARSEMEM |
14904927 | 249 | static void __init arm_memory_present(void) |
657e12fd RK |
250 | { |
251 | } | |
252 | #else | |
14904927 | 253 | static void __init arm_memory_present(void) |
657e12fd | 254 | { |
719c1514 | 255 | struct memblock_region *reg; |
719c1514 | 256 | |
7c996361 | 257 | for_each_memblock(memory, reg) |
c7fc2de0 YL |
258 | memory_present(0, memblock_region_memory_base_pfn(reg), |
259 | memblock_region_memory_end_pfn(reg)); | |
657e12fd | 260 | } |
b7cfda9f RK |
261 | #endif |
262 | ||
716a3dc2 RK |
263 | static bool arm_memblock_steal_permitted = true; |
264 | ||
bc2827d0 | 265 | phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) |
716a3dc2 RK |
266 | { |
267 | phys_addr_t phys; | |
268 | ||
269 | BUG_ON(!arm_memblock_steal_permitted); | |
270 | ||
7ac68a4c | 271 | phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); |
716a3dc2 RK |
272 | memblock_free(phys, size); |
273 | memblock_remove(phys, size); | |
274 | ||
275 | return phys; | |
276 | } | |
277 | ||
1c2f87c2 | 278 | void __init arm_memblock_init(const struct machine_desc *mdesc) |
2778f620 | 279 | { |
2778f620 RK |
280 | /* Register the kernel text, kernel data and initrd with memblock. */ |
281 | #ifdef CONFIG_XIP_KERNEL | |
842eab40 | 282 | memblock_reserve(__pa(_sdata), _end - _sdata); |
2778f620 RK |
283 | #else |
284 | memblock_reserve(__pa(_stext), _end - _stext); | |
285 | #endif | |
286 | #ifdef CONFIG_BLK_DEV_INITRD | |
65939301 | 287 | /* FDT scan will populate initrd_start */ |
4c235cb9 | 288 | if (initrd_start && !phys_initrd_size) { |
65939301 RH |
289 | phys_initrd_start = __virt_to_phys(initrd_start); |
290 | phys_initrd_size = initrd_end - initrd_start; | |
291 | } | |
4c235cb9 | 292 | initrd_start = initrd_end = 0; |
8f4b8c76 RK |
293 | if (phys_initrd_size && |
294 | !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { | |
de22cc6e VA |
295 | pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", |
296 | (u64)phys_initrd_start, phys_initrd_size); | |
8f4b8c76 RK |
297 | phys_initrd_start = phys_initrd_size = 0; |
298 | } | |
b0a2679d RK |
299 | if (phys_initrd_size && |
300 | memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { | |
de22cc6e VA |
301 | pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", |
302 | (u64)phys_initrd_start, phys_initrd_size); | |
b0a2679d RK |
303 | phys_initrd_start = phys_initrd_size = 0; |
304 | } | |
2778f620 RK |
305 | if (phys_initrd_size) { |
306 | memblock_reserve(phys_initrd_start, phys_initrd_size); | |
307 | ||
308 | /* Now convert initrd to virtual addresses */ | |
309 | initrd_start = __phys_to_virt(phys_initrd_start); | |
310 | initrd_end = initrd_start + phys_initrd_size; | |
311 | } | |
312 | #endif | |
313 | ||
314 | arm_mm_memblock_reserve(); | |
315 | ||
8d717a52 RK |
316 | /* reserve any platform specific memblock areas */ |
317 | if (mdesc->reserve) | |
318 | mdesc->reserve(); | |
319 | ||
bcedb5f9 MS |
320 | early_init_fdt_scan_reserved_mem(); |
321 | ||
c7909509 MS |
322 | /* |
323 | * reserve memory for DMA contigouos allocations, | |
324 | * must come from DMA area inside low memory | |
325 | */ | |
95b0e655 | 326 | dma_contiguous_reserve(arm_dma_limit); |
c7909509 | 327 | |
716a3dc2 | 328 | arm_memblock_steal_permitted = false; |
2778f620 RK |
329 | memblock_dump_all(); |
330 | } | |
331 | ||
8d717a52 | 332 | void __init bootmem_init(void) |
1da177e4 | 333 | { |
dde5828f | 334 | unsigned long min, max_low, max_high; |
1da177e4 | 335 | |
8e58caef | 336 | memblock_allow_resize(); |
dde5828f RK |
337 | max_low = max_high = 0; |
338 | ||
f25b4b4c | 339 | find_limits(&min, &max_low, &max_high); |
dde5828f | 340 | |
be370302 RK |
341 | /* |
342 | * Sparsemem tries to allocate bootmem in memory_present(), | |
343 | * so must be done after the fixed reservations | |
344 | */ | |
eda2e5dc | 345 | arm_memory_present(); |
1da177e4 | 346 | |
b7a69ac3 RK |
347 | /* |
348 | * sparse_init() needs the bootmem allocator up and running. | |
349 | */ | |
350 | sparse_init(); | |
351 | ||
352 | /* | |
be370302 | 353 | * Now free the memory - free_area_init_node needs |
b7a69ac3 RK |
354 | * the sparse mem_map arrays initialized by sparse_init() |
355 | * for memmap_init_zone(), otherwise all PFNs are invalid. | |
356 | */ | |
84f452b1 | 357 | zone_sizes_init(min, max_low, max_high); |
b7a69ac3 | 358 | |
90072059 RK |
359 | /* |
360 | * This doesn't seem to be used by the Linux memory manager any | |
361 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
362 | * also get rid of some of the stuff above as well. | |
90072059 | 363 | */ |
26ba47b1 SS |
364 | min_low_pfn = min; |
365 | max_low_pfn = max_low; | |
366 | max_pfn = max_high; | |
90072059 | 367 | } |
1da177e4 | 368 | |
54d52573 SB |
369 | /* |
370 | * Poison init memory with an undefined instruction (ARM) or a branch to an | |
371 | * undefined instruction (Thumb). | |
372 | */ | |
373 | static inline void poison_init_mem(void *s, size_t count) | |
374 | { | |
375 | u32 *p = (u32 *)s; | |
bf912d99 | 376 | for (; count != 0; count -= 4) |
54d52573 SB |
377 | *p++ = 0xe7fddef0; |
378 | } | |
379 | ||
a013053d | 380 | static inline void |
be370302 | 381 | free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
a013053d RK |
382 | { |
383 | struct page *start_pg, *end_pg; | |
56bc6286 | 384 | phys_addr_t pg, pgend; |
a013053d RK |
385 | |
386 | /* | |
387 | * Convert start_pfn/end_pfn to a struct page pointer. | |
388 | */ | |
3257f43d | 389 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
9af386c8 | 390 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
a013053d RK |
391 | |
392 | /* | |
393 | * Convert to physical addresses, and | |
394 | * round start upwards and end downwards. | |
395 | */ | |
56bc6286 VA |
396 | pg = PAGE_ALIGN(__pa(start_pg)); |
397 | pgend = __pa(end_pg) & PAGE_MASK; | |
a013053d RK |
398 | |
399 | /* | |
400 | * If there are free pages between these, | |
401 | * free the section of the memmap array. | |
402 | */ | |
403 | if (pg < pgend) | |
cfb66586 | 404 | memblock_free_early(pg, pgend - pg); |
a013053d RK |
405 | } |
406 | ||
407 | /* | |
408 | * The mem_map array can get very big. Free the unused area of the memory map. | |
409 | */ | |
1c2f87c2 | 410 | static void __init free_unused_memmap(void) |
a013053d | 411 | { |
1c2f87c2 LA |
412 | unsigned long start, prev_end = 0; |
413 | struct memblock_region *reg; | |
a013053d RK |
414 | |
415 | /* | |
3260e529 MB |
416 | * This relies on each bank being in address order. |
417 | * The banks are sorted previously in bootmem_init(). | |
a013053d | 418 | */ |
1c2f87c2 LA |
419 | for_each_memblock(memory, reg) { |
420 | start = memblock_region_memory_base_pfn(reg); | |
a013053d | 421 | |
9af386c8 WD |
422 | #ifdef CONFIG_SPARSEMEM |
423 | /* | |
424 | * Take care not to free memmap entries that don't exist | |
425 | * due to SPARSEMEM sections which aren't present. | |
426 | */ | |
1c2f87c2 LA |
427 | start = min(start, |
428 | ALIGN(prev_end, PAGES_PER_SECTION)); | |
002ea9ee LW |
429 | #else |
430 | /* | |
431 | * Align down here since the VM subsystem insists that the | |
432 | * memmap entries are valid from the bank start aligned to | |
433 | * MAX_ORDER_NR_PAGES. | |
434 | */ | |
1c2f87c2 | 435 | start = round_down(start, MAX_ORDER_NR_PAGES); |
9af386c8 | 436 | #endif |
a013053d RK |
437 | /* |
438 | * If we had a previous bank, and there is a space | |
439 | * between the current bank and the previous, free it. | |
440 | */ | |
1c2f87c2 LA |
441 | if (prev_end && prev_end < start) |
442 | free_memmap(prev_end, start); | |
a013053d | 443 | |
3260e529 MB |
444 | /* |
445 | * Align up here since the VM subsystem insists that the | |
446 | * memmap entries are valid from the bank end aligned to | |
447 | * MAX_ORDER_NR_PAGES. | |
448 | */ | |
1c2f87c2 LA |
449 | prev_end = ALIGN(memblock_region_memory_end_pfn(reg), |
450 | MAX_ORDER_NR_PAGES); | |
a013053d | 451 | } |
9af386c8 WD |
452 | |
453 | #ifdef CONFIG_SPARSEMEM | |
1c2f87c2 LA |
454 | if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) |
455 | free_memmap(prev_end, | |
456 | ALIGN(prev_end, PAGES_PER_SECTION)); | |
9af386c8 | 457 | #endif |
a013053d RK |
458 | } |
459 | ||
83db0384 JL |
460 | #ifdef CONFIG_HIGHMEM |
461 | static inline void free_area_high(unsigned long pfn, unsigned long end) | |
462 | { | |
dd6911ef JL |
463 | for (; pfn < end; pfn++) |
464 | free_highmem_page(pfn_to_page(pfn)); | |
83db0384 JL |
465 | } |
466 | #endif | |
467 | ||
d0e775af RK |
468 | static void __init free_highpages(void) |
469 | { | |
470 | #ifdef CONFIG_HIGHMEM | |
26ba47b1 | 471 | unsigned long max_low = max_low_pfn; |
df4f14c7 | 472 | struct memblock_region *mem, *res; |
d0e775af RK |
473 | |
474 | /* set highmem page free */ | |
df4f14c7 RK |
475 | for_each_memblock(memory, mem) { |
476 | unsigned long start = memblock_region_memory_base_pfn(mem); | |
477 | unsigned long end = memblock_region_memory_end_pfn(mem); | |
478 | ||
479 | /* Ignore complete lowmem entries */ | |
480 | if (end <= max_low) | |
481 | continue; | |
482 | ||
483 | /* Truncate partial highmem entries */ | |
484 | if (start < max_low) | |
485 | start = max_low; | |
486 | ||
487 | /* Find and exclude any reserved regions */ | |
488 | for_each_memblock(reserved, res) { | |
489 | unsigned long res_start, res_end; | |
490 | ||
491 | res_start = memblock_region_reserved_base_pfn(res); | |
492 | res_end = memblock_region_reserved_end_pfn(res); | |
493 | ||
494 | if (res_end < start) | |
495 | continue; | |
496 | if (res_start < start) | |
497 | res_start = start; | |
498 | if (res_start > end) | |
499 | res_start = end; | |
500 | if (res_end > end) | |
501 | res_end = end; | |
502 | if (res_start != start) | |
83db0384 | 503 | free_area_high(start, res_start); |
df4f14c7 RK |
504 | start = res_end; |
505 | if (start == end) | |
506 | break; | |
507 | } | |
508 | ||
509 | /* And now free anything which remains */ | |
510 | if (start < end) | |
83db0384 | 511 | free_area_high(start, end); |
d0e775af | 512 | } |
d0e775af RK |
513 | #endif |
514 | } | |
515 | ||
1da177e4 LT |
516 | /* |
517 | * mem_init() marks the free areas in the mem_map and tells us how much | |
518 | * memory is free. This is done after various parts of the system have | |
519 | * claimed their memory after the kernel image. | |
520 | */ | |
521 | void __init mem_init(void) | |
522 | { | |
1dbd30e9 LW |
523 | #ifdef CONFIG_HAVE_TCM |
524 | /* These pointers are filled in on TCM detection */ | |
525 | extern u32 dtcm_end; | |
526 | extern u32 itcm_end; | |
527 | #endif | |
1da177e4 | 528 | |
b3ba41f2 | 529 | set_max_mapnr(pfn_to_page(max_pfn) - mem_map); |
1da177e4 | 530 | |
1da177e4 | 531 | /* this will put all unused low memory onto the freelists */ |
1c2f87c2 | 532 | free_unused_memmap(); |
0c988534 | 533 | free_all_bootmem(); |
1da177e4 LT |
534 | |
535 | #ifdef CONFIG_SA1111 | |
536 | /* now that our DMA memory is actually so designated, we can free it */ | |
bfd65dd9 | 537 | free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); |
1da177e4 LT |
538 | #endif |
539 | ||
d0e775af | 540 | free_highpages(); |
3835f6cb | 541 | |
2450c973 | 542 | mem_init_print_info(NULL); |
1da177e4 | 543 | |
db9ef1af FB |
544 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
545 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
546 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
547 | ||
4ed89f22 | 548 | pr_notice("Virtual kernel memory layout:\n" |
db9ef1af | 549 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 550 | #ifdef CONFIG_HAVE_TCM |
07d2a5c7 | 551 | " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 552 | " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 553 | #endif |
db9ef1af FB |
554 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
555 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
556 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
557 | #ifdef CONFIG_HIGHMEM | |
558 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
559 | #endif | |
d9277d51 | 560 | #ifdef CONFIG_MODULES |
db9ef1af | 561 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" |
d9277d51 | 562 | #endif |
178c3dfe RK |
563 | " .text : 0x%p" " - 0x%p" " (%4td kB)\n" |
564 | " .init : 0x%p" " - 0x%p" " (%4td kB)\n" | |
565 | " .data : 0x%p" " - 0x%p" " (%4td kB)\n" | |
566 | " .bss : 0x%p" " - 0x%p" " (%4td kB)\n", | |
db9ef1af FB |
567 | |
568 | MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + | |
569 | (PAGE_SIZE)), | |
07d2a5c7 | 570 | #ifdef CONFIG_HAVE_TCM |
1dbd30e9 LW |
571 | MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
572 | MLK(ITCM_OFFSET, (unsigned long) itcm_end), | |
07d2a5c7 | 573 | #endif |
b615bbbf | 574 | MLK(FIXADDR_START, FIXADDR_END), |
c931b4f6 | 575 | MLM(VMALLOC_START, VMALLOC_END), |
db9ef1af FB |
576 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
577 | #ifdef CONFIG_HIGHMEM | |
578 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * | |
579 | (PAGE_SIZE)), | |
580 | #endif | |
d9277d51 | 581 | #ifdef CONFIG_MODULES |
db9ef1af | 582 | MLM(MODULES_VADDR, MODULES_END), |
d9277d51 | 583 | #endif |
db9ef1af | 584 | |
db9ef1af | 585 | MLK_ROUNDUP(_text, _etext), |
3835d69a | 586 | MLK_ROUNDUP(__init_begin, __init_end), |
45f6d7e0 RV |
587 | MLK_ROUNDUP(_sdata, _edata), |
588 | MLK_ROUNDUP(__bss_start, __bss_stop)); | |
db9ef1af FB |
589 | |
590 | #undef MLK | |
591 | #undef MLM | |
592 | #undef MLK_ROUNDUP | |
593 | ||
a1839272 FB |
594 | /* |
595 | * Check boundaries twice: Some fundamental inconsistencies can | |
596 | * be detected at build time already. | |
597 | */ | |
598 | #ifdef CONFIG_MMU | |
a1839272 FB |
599 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
600 | BUG_ON(TASK_SIZE > MODULES_VADDR); | |
601 | #endif | |
602 | ||
603 | #ifdef CONFIG_HIGHMEM | |
604 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
605 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
606 | #endif | |
607 | ||
2450c973 | 608 | if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { |
1da177e4 LT |
609 | extern int sysctl_overcommit_memory; |
610 | /* | |
611 | * On a machine this small we won't get | |
612 | * anywhere without overcommit, so turn | |
613 | * it on by default. | |
614 | */ | |
615 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
616 | } | |
617 | } | |
618 | ||
1e6b4811 KC |
619 | #ifdef CONFIG_ARM_KERNMEM_PERMS |
620 | struct section_perm { | |
621 | unsigned long start; | |
622 | unsigned long end; | |
623 | pmdval_t mask; | |
624 | pmdval_t prot; | |
80d6b0c2 | 625 | pmdval_t clear; |
1e6b4811 KC |
626 | }; |
627 | ||
80d6b0c2 | 628 | static struct section_perm nx_perms[] = { |
1e6b4811 KC |
629 | /* Make pages tables, etc before _stext RW (set NX). */ |
630 | { | |
631 | .start = PAGE_OFFSET, | |
632 | .end = (unsigned long)_stext, | |
633 | .mask = ~PMD_SECT_XN, | |
634 | .prot = PMD_SECT_XN, | |
635 | }, | |
636 | /* Make init RW (set NX). */ | |
637 | { | |
638 | .start = (unsigned long)__init_begin, | |
639 | .end = (unsigned long)_sdata, | |
640 | .mask = ~PMD_SECT_XN, | |
641 | .prot = PMD_SECT_XN, | |
642 | }, | |
80d6b0c2 KC |
643 | #ifdef CONFIG_DEBUG_RODATA |
644 | /* Make rodata NX (set RO in ro_perms below). */ | |
645 | { | |
646 | .start = (unsigned long)__start_rodata, | |
647 | .end = (unsigned long)__init_begin, | |
648 | .mask = ~PMD_SECT_XN, | |
649 | .prot = PMD_SECT_XN, | |
650 | }, | |
651 | #endif | |
1e6b4811 KC |
652 | }; |
653 | ||
80d6b0c2 KC |
654 | #ifdef CONFIG_DEBUG_RODATA |
655 | static struct section_perm ro_perms[] = { | |
656 | /* Make kernel code and rodata RX (set RO). */ | |
657 | { | |
658 | .start = (unsigned long)_stext, | |
659 | .end = (unsigned long)__init_begin, | |
660 | #ifdef CONFIG_ARM_LPAE | |
661 | .mask = ~PMD_SECT_RDONLY, | |
662 | .prot = PMD_SECT_RDONLY, | |
663 | #else | |
664 | .mask = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE), | |
665 | .prot = PMD_SECT_APX | PMD_SECT_AP_WRITE, | |
666 | .clear = PMD_SECT_AP_WRITE, | |
667 | #endif | |
668 | }, | |
669 | }; | |
670 | #endif | |
671 | ||
1e6b4811 KC |
672 | /* |
673 | * Updates section permissions only for the current mm (sections are | |
674 | * copied into each mm). During startup, this is the init_mm. Is only | |
675 | * safe to be called with preemption disabled, as under stop_machine(). | |
676 | */ | |
677 | static inline void section_update(unsigned long addr, pmdval_t mask, | |
678 | pmdval_t prot) | |
679 | { | |
680 | struct mm_struct *mm; | |
681 | pmd_t *pmd; | |
682 | ||
683 | mm = current->active_mm; | |
684 | pmd = pmd_offset(pud_offset(pgd_offset(mm, addr), addr), addr); | |
685 | ||
686 | #ifdef CONFIG_ARM_LPAE | |
687 | pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); | |
688 | #else | |
689 | if (addr & SECTION_SIZE) | |
690 | pmd[1] = __pmd((pmd_val(pmd[1]) & mask) | prot); | |
691 | else | |
692 | pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); | |
693 | #endif | |
694 | flush_pmd_entry(pmd); | |
695 | local_flush_tlb_kernel_range(addr, addr + SECTION_SIZE); | |
696 | } | |
697 | ||
698 | /* Make sure extended page tables are in use. */ | |
699 | static inline bool arch_has_strict_perms(void) | |
700 | { | |
701 | if (cpu_architecture() < CPU_ARCH_ARMv6) | |
702 | return false; | |
703 | ||
704 | return !!(get_cr() & CR_XP); | |
705 | } | |
706 | ||
707 | #define set_section_perms(perms, field) { \ | |
708 | size_t i; \ | |
709 | unsigned long addr; \ | |
710 | \ | |
711 | if (!arch_has_strict_perms()) \ | |
712 | return; \ | |
713 | \ | |
714 | for (i = 0; i < ARRAY_SIZE(perms); i++) { \ | |
715 | if (!IS_ALIGNED(perms[i].start, SECTION_SIZE) || \ | |
716 | !IS_ALIGNED(perms[i].end, SECTION_SIZE)) { \ | |
717 | pr_err("BUG: section %lx-%lx not aligned to %lx\n", \ | |
718 | perms[i].start, perms[i].end, \ | |
719 | SECTION_SIZE); \ | |
720 | continue; \ | |
721 | } \ | |
722 | \ | |
723 | for (addr = perms[i].start; \ | |
724 | addr < perms[i].end; \ | |
725 | addr += SECTION_SIZE) \ | |
726 | section_update(addr, perms[i].mask, \ | |
727 | perms[i].field); \ | |
728 | } \ | |
729 | } | |
730 | ||
731 | static inline void fix_kernmem_perms(void) | |
732 | { | |
733 | set_section_perms(nx_perms, prot); | |
734 | } | |
80d6b0c2 KC |
735 | |
736 | #ifdef CONFIG_DEBUG_RODATA | |
737 | void mark_rodata_ro(void) | |
738 | { | |
739 | set_section_perms(ro_perms, prot); | |
740 | } | |
741 | ||
742 | void set_kernel_text_rw(void) | |
743 | { | |
744 | set_section_perms(ro_perms, clear); | |
745 | } | |
746 | ||
747 | void set_kernel_text_ro(void) | |
748 | { | |
749 | set_section_perms(ro_perms, prot); | |
750 | } | |
751 | #endif /* CONFIG_DEBUG_RODATA */ | |
752 | ||
1e6b4811 KC |
753 | #else |
754 | static inline void fix_kernmem_perms(void) { } | |
755 | #endif /* CONFIG_ARM_KERNMEM_PERMS */ | |
756 | ||
757 | void free_tcmmem(void) | |
1da177e4 | 758 | { |
bc581770 | 759 | #ifdef CONFIG_HAVE_TCM |
ea208f64 | 760 | extern char __tcm_start, __tcm_end; |
bc581770 | 761 | |
54d52573 | 762 | poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); |
dbe67df4 | 763 | free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); |
bc581770 | 764 | #endif |
1e6b4811 KC |
765 | } |
766 | ||
767 | void free_initmem(void) | |
768 | { | |
769 | fix_kernmem_perms(); | |
770 | free_tcmmem(); | |
bc581770 | 771 | |
54d52573 | 772 | poison_init_mem(__init_begin, __init_end - __init_begin); |
6db015e4 | 773 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
dbe67df4 | 774 | free_initmem_default(-1); |
1da177e4 LT |
775 | } |
776 | ||
777 | #ifdef CONFIG_BLK_DEV_INITRD | |
778 | ||
779 | static int keep_initrd; | |
780 | ||
781 | void free_initrd_mem(unsigned long start, unsigned long end) | |
782 | { | |
54d52573 | 783 | if (!keep_initrd) { |
421520ba YW |
784 | if (start == initrd_start) |
785 | start = round_down(start, PAGE_SIZE); | |
786 | if (end == initrd_end) | |
787 | end = round_up(end, PAGE_SIZE); | |
788 | ||
54d52573 | 789 | poison_init_mem((void *)start, PAGE_ALIGN(end) - start); |
dbe67df4 | 790 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
54d52573 | 791 | } |
1da177e4 LT |
792 | } |
793 | ||
794 | static int __init keepinitrd_setup(char *__unused) | |
795 | { | |
796 | keep_initrd = 1; | |
797 | return 1; | |
798 | } | |
799 | ||
800 | __setup("keepinitrd", keepinitrd_setup); | |
801 | #endif |