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> | |
16 | #include <linux/nodemask.h> | |
17 | #include <linux/initrd.h> | |
9eb8f674 | 18 | #include <linux/of_fdt.h> |
3835f6cb | 19 | #include <linux/highmem.h> |
5a0e3ad6 | 20 | #include <linux/gfp.h> |
2778f620 | 21 | #include <linux/memblock.h> |
7dc50ec7 | 22 | #include <linux/sort.h> |
1da177e4 LT |
23 | |
24 | #include <asm/mach-types.h> | |
93c02ab4 | 25 | #include <asm/prom.h> |
37efe642 | 26 | #include <asm/sections.h> |
1da177e4 | 27 | #include <asm/setup.h> |
74d02fb9 | 28 | #include <asm/sizes.h> |
1da177e4 | 29 | #include <asm/tlb.h> |
db9ef1af | 30 | #include <asm/fixmap.h> |
1da177e4 LT |
31 | |
32 | #include <asm/mach/arch.h> | |
33 | #include <asm/mach/map.h> | |
34 | ||
1b2e2b73 RK |
35 | #include "mm.h" |
36 | ||
012d1f4a RK |
37 | static unsigned long phys_initrd_start __initdata = 0; |
38 | static unsigned long phys_initrd_size __initdata = 0; | |
39 | ||
2b0d8c25 | 40 | static int __init early_initrd(char *p) |
012d1f4a RK |
41 | { |
42 | unsigned long start, size; | |
2b0d8c25 | 43 | char *endp; |
012d1f4a | 44 | |
2b0d8c25 JK |
45 | start = memparse(p, &endp); |
46 | if (*endp == ',') { | |
47 | size = memparse(endp + 1, NULL); | |
012d1f4a RK |
48 | |
49 | phys_initrd_start = start; | |
50 | phys_initrd_size = size; | |
51 | } | |
2b0d8c25 | 52 | return 0; |
012d1f4a | 53 | } |
2b0d8c25 | 54 | early_param("initrd", early_initrd); |
012d1f4a RK |
55 | |
56 | static int __init parse_tag_initrd(const struct tag *tag) | |
57 | { | |
58 | printk(KERN_WARNING "ATAG_INITRD is deprecated; " | |
59 | "please update your bootloader.\n"); | |
60 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); | |
61 | phys_initrd_size = tag->u.initrd.size; | |
62 | return 0; | |
63 | } | |
64 | ||
65 | __tagtable(ATAG_INITRD, parse_tag_initrd); | |
66 | ||
67 | static int __init parse_tag_initrd2(const struct tag *tag) | |
68 | { | |
69 | phys_initrd_start = tag->u.initrd.start; | |
70 | phys_initrd_size = tag->u.initrd.size; | |
71 | return 0; | |
72 | } | |
73 | ||
74 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); | |
1da177e4 | 75 | |
9eb8f674 GL |
76 | #ifdef CONFIG_OF_FLATTREE |
77 | void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end) | |
78 | { | |
79 | phys_initrd_start = start; | |
80 | phys_initrd_size = end - start; | |
81 | } | |
82 | #endif /* CONFIG_OF_FLATTREE */ | |
83 | ||
1da177e4 | 84 | /* |
4b5f32ce NP |
85 | * This keeps memory configuration data used by a couple memory |
86 | * initialization functions, as well as show_mem() for the skipping | |
87 | * of holes in the memory map. It is populated by arm_add_memory(). | |
1da177e4 | 88 | */ |
4b5f32ce | 89 | struct meminfo meminfo; |
5e709827 | 90 | |
b2b755b5 | 91 | void show_mem(unsigned int filter) |
1da177e4 LT |
92 | { |
93 | int free = 0, total = 0, reserved = 0; | |
be370302 | 94 | int shared = 0, cached = 0, slab = 0, i; |
5e709827 | 95 | struct meminfo * mi = &meminfo; |
1da177e4 LT |
96 | |
97 | printk("Mem-info:\n"); | |
7bf02ea2 | 98 | show_free_areas(filter); |
be370302 RK |
99 | |
100 | for_each_bank (i, mi) { | |
101 | struct membank *bank = &mi->bank[i]; | |
102 | unsigned int pfn1, pfn2; | |
103 | struct page *page, *end; | |
104 | ||
105 | pfn1 = bank_pfn_start(bank); | |
106 | pfn2 = bank_pfn_end(bank); | |
107 | ||
108 | page = pfn_to_page(pfn1); | |
109 | end = pfn_to_page(pfn2 - 1) + 1; | |
110 | ||
111 | do { | |
112 | total++; | |
113 | if (PageReserved(page)) | |
114 | reserved++; | |
115 | else if (PageSwapCache(page)) | |
116 | cached++; | |
117 | else if (PageSlab(page)) | |
118 | slab++; | |
119 | else if (!page_count(page)) | |
120 | free++; | |
121 | else | |
122 | shared += page_count(page) - 1; | |
123 | page++; | |
124 | } while (page < end); | |
1da177e4 LT |
125 | } |
126 | ||
127 | printk("%d pages of RAM\n", total); | |
128 | printk("%d free pages\n", free); | |
129 | printk("%d reserved pages\n", reserved); | |
130 | printk("%d slab pages\n", slab); | |
131 | printk("%d pages shared\n", shared); | |
132 | printk("%d pages swap cached\n", cached); | |
133 | } | |
134 | ||
f25b4b4c RK |
135 | static void __init find_limits(unsigned long *min, unsigned long *max_low, |
136 | unsigned long *max_high) | |
dde5828f | 137 | { |
f25b4b4c | 138 | struct meminfo *mi = &meminfo; |
dde5828f RK |
139 | int i; |
140 | ||
141 | *min = -1UL; | |
142 | *max_low = *max_high = 0; | |
143 | ||
be370302 | 144 | for_each_bank (i, mi) { |
dde5828f RK |
145 | struct membank *bank = &mi->bank[i]; |
146 | unsigned long start, end; | |
147 | ||
148 | start = bank_pfn_start(bank); | |
149 | end = bank_pfn_end(bank); | |
150 | ||
151 | if (*min > start) | |
152 | *min = start; | |
153 | if (*max_high < end) | |
154 | *max_high = end; | |
155 | if (bank->highmem) | |
156 | continue; | |
157 | if (*max_low < end) | |
158 | *max_low = end; | |
159 | } | |
160 | } | |
161 | ||
a801d276 RK |
162 | static void __init arm_bootmem_init(unsigned long start_pfn, |
163 | unsigned long end_pfn) | |
1da177e4 | 164 | { |
719c1514 | 165 | struct memblock_region *reg; |
90072059 | 166 | unsigned int boot_pages; |
2778f620 | 167 | phys_addr_t bitmap; |
90072059 | 168 | pg_data_t *pgdat; |
1da177e4 | 169 | |
90072059 | 170 | /* |
2778f620 RK |
171 | * Allocate the bootmem bitmap page. This must be in a region |
172 | * of memory which has already been mapped. | |
90072059 RK |
173 | */ |
174 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
2778f620 RK |
175 | bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, |
176 | __pfn_to_phys(end_pfn)); | |
1da177e4 | 177 | |
90072059 | 178 | /* |
be370302 | 179 | * Initialise the bootmem allocator, handing the |
90072059 RK |
180 | * memory banks over to bootmem. |
181 | */ | |
be370302 RK |
182 | node_set_online(0); |
183 | pgdat = NODE_DATA(0); | |
2778f620 | 184 | init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); |
1da177e4 | 185 | |
a801d276 RK |
186 | /* Free the lowmem regions from memblock into bootmem. */ |
187 | for_each_memblock(memory, reg) { | |
188 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
189 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
190 | ||
191 | if (end >= end_pfn) | |
192 | end = end_pfn; | |
193 | if (start >= end) | |
194 | break; | |
195 | ||
196 | free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); | |
d2a38ef9 | 197 | } |
90072059 | 198 | |
a801d276 | 199 | /* Reserve the lowmem memblock reserved regions in bootmem. */ |
719c1514 | 200 | for_each_memblock(reserved, reg) { |
a801d276 RK |
201 | unsigned long start = memblock_region_reserved_base_pfn(reg); |
202 | unsigned long end = memblock_region_reserved_end_pfn(reg); | |
203 | ||
204 | if (end >= end_pfn) | |
205 | end = end_pfn; | |
206 | if (start >= end) | |
207 | break; | |
208 | ||
209 | reserve_bootmem(__pfn_to_phys(start), | |
210 | (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); | |
1da177e4 | 211 | } |
b7a69ac3 RK |
212 | } |
213 | ||
be20902b | 214 | #ifdef CONFIG_ZONE_DMA |
65032018 | 215 | |
65032018 | 216 | unsigned long arm_dma_zone_size __read_mostly; |
65032018 NP |
217 | EXPORT_SYMBOL(arm_dma_zone_size); |
218 | ||
022ae537 RK |
219 | /* |
220 | * The DMA mask corresponding to the maximum bus address allocatable | |
221 | * using GFP_DMA. The default here places no restriction on DMA | |
222 | * allocations. This must be the smallest DMA mask in the system, | |
223 | * so a successful GFP_DMA allocation will always satisfy this. | |
224 | */ | |
225 | u32 arm_dma_limit; | |
226 | ||
be20902b RK |
227 | static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, |
228 | unsigned long dma_size) | |
229 | { | |
230 | if (size[0] <= dma_size) | |
231 | return; | |
232 | ||
233 | size[ZONE_NORMAL] = size[0] - dma_size; | |
234 | size[ZONE_DMA] = dma_size; | |
235 | hole[ZONE_NORMAL] = hole[0]; | |
236 | hole[ZONE_DMA] = 0; | |
237 | } | |
238 | #endif | |
239 | ||
a2c54d2a RK |
240 | static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, |
241 | unsigned long max_high) | |
b7a69ac3 RK |
242 | { |
243 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
a2c54d2a | 244 | struct memblock_region *reg; |
b7a69ac3 | 245 | |
90072059 | 246 | /* |
be370302 | 247 | * initialise the zones. |
90072059 RK |
248 | */ |
249 | memset(zone_size, 0, sizeof(zone_size)); | |
90072059 RK |
250 | |
251 | /* | |
be370302 RK |
252 | * The memory size has already been determined. If we need |
253 | * to do anything fancy with the allocation of this memory | |
254 | * to the zones, now is the time to do it. | |
90072059 | 255 | */ |
dde5828f RK |
256 | zone_size[0] = max_low - min; |
257 | #ifdef CONFIG_HIGHMEM | |
258 | zone_size[ZONE_HIGHMEM] = max_high - max_low; | |
259 | #endif | |
90072059 RK |
260 | |
261 | /* | |
be370302 RK |
262 | * Calculate the size of the holes. |
263 | * holes = node_size - sum(bank_sizes) | |
90072059 | 264 | */ |
dde5828f | 265 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
a2c54d2a RK |
266 | for_each_memblock(memory, reg) { |
267 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
268 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
269 | ||
270 | if (start < max_low) { | |
271 | unsigned long low_end = min(end, max_low); | |
272 | zhole_size[0] -= low_end - start; | |
273 | } | |
dde5828f | 274 | #ifdef CONFIG_HIGHMEM |
a2c54d2a RK |
275 | if (end > max_low) { |
276 | unsigned long high_start = max(start, max_low); | |
277 | zhole_size[ZONE_HIGHMEM] -= end - high_start; | |
278 | } | |
dde5828f | 279 | #endif |
dde5828f | 280 | } |
90072059 | 281 | |
65032018 | 282 | #ifdef CONFIG_ZONE_DMA |
90072059 RK |
283 | /* |
284 | * Adjust the sizes according to any special requirements for | |
285 | * this machine type. | |
286 | */ | |
65032018 NP |
287 | if (arm_dma_zone_size) { |
288 | arm_adjust_dma_zone(zone_size, zhole_size, | |
289 | arm_dma_zone_size >> PAGE_SHIFT); | |
290 | arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; | |
291 | } else | |
292 | arm_dma_limit = 0xffffffff; | |
be20902b | 293 | #endif |
90072059 | 294 | |
be370302 | 295 | free_area_init_node(0, zone_size, min, zhole_size); |
1da177e4 LT |
296 | } |
297 | ||
7b7bf499 | 298 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
b7cfda9f RK |
299 | int pfn_valid(unsigned long pfn) |
300 | { | |
5e6f6aa1 | 301 | return memblock_is_memory(pfn << PAGE_SHIFT); |
b7cfda9f RK |
302 | } |
303 | EXPORT_SYMBOL(pfn_valid); | |
7b7bf499 | 304 | #endif |
657e12fd | 305 | |
7b7bf499 | 306 | #ifndef CONFIG_SPARSEMEM |
eda2e5dc | 307 | static void arm_memory_present(void) |
657e12fd RK |
308 | { |
309 | } | |
310 | #else | |
eda2e5dc | 311 | static void arm_memory_present(void) |
657e12fd | 312 | { |
719c1514 | 313 | struct memblock_region *reg; |
719c1514 | 314 | |
7c996361 | 315 | for_each_memblock(memory, reg) |
c7fc2de0 YL |
316 | memory_present(0, memblock_region_memory_base_pfn(reg), |
317 | memblock_region_memory_end_pfn(reg)); | |
657e12fd | 318 | } |
b7cfda9f RK |
319 | #endif |
320 | ||
7dc50ec7 RK |
321 | static int __init meminfo_cmp(const void *_a, const void *_b) |
322 | { | |
323 | const struct membank *a = _a, *b = _b; | |
324 | long cmp = bank_pfn_start(a) - bank_pfn_start(b); | |
325 | return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; | |
326 | } | |
327 | ||
8d717a52 | 328 | void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) |
2778f620 RK |
329 | { |
330 | int i; | |
331 | ||
7dc50ec7 RK |
332 | sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL); |
333 | ||
2778f620 RK |
334 | memblock_init(); |
335 | for (i = 0; i < mi->nr_banks; i++) | |
336 | memblock_add(mi->bank[i].start, mi->bank[i].size); | |
337 | ||
338 | /* Register the kernel text, kernel data and initrd with memblock. */ | |
339 | #ifdef CONFIG_XIP_KERNEL | |
842eab40 | 340 | memblock_reserve(__pa(_sdata), _end - _sdata); |
2778f620 RK |
341 | #else |
342 | memblock_reserve(__pa(_stext), _end - _stext); | |
343 | #endif | |
344 | #ifdef CONFIG_BLK_DEV_INITRD | |
8f4b8c76 RK |
345 | if (phys_initrd_size && |
346 | !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { | |
347 | pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n", | |
348 | phys_initrd_start, phys_initrd_size); | |
349 | phys_initrd_start = phys_initrd_size = 0; | |
350 | } | |
b0a2679d RK |
351 | if (phys_initrd_size && |
352 | memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { | |
353 | pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n", | |
354 | phys_initrd_start, phys_initrd_size); | |
355 | phys_initrd_start = phys_initrd_size = 0; | |
356 | } | |
2778f620 RK |
357 | if (phys_initrd_size) { |
358 | memblock_reserve(phys_initrd_start, phys_initrd_size); | |
359 | ||
360 | /* Now convert initrd to virtual addresses */ | |
361 | initrd_start = __phys_to_virt(phys_initrd_start); | |
362 | initrd_end = initrd_start + phys_initrd_size; | |
363 | } | |
364 | #endif | |
365 | ||
366 | arm_mm_memblock_reserve(); | |
93c02ab4 | 367 | arm_dt_memblock_reserve(); |
2778f620 | 368 | |
8d717a52 RK |
369 | /* reserve any platform specific memblock areas */ |
370 | if (mdesc->reserve) | |
371 | mdesc->reserve(); | |
372 | ||
2778f620 RK |
373 | memblock_analyze(); |
374 | memblock_dump_all(); | |
375 | } | |
376 | ||
8d717a52 | 377 | void __init bootmem_init(void) |
1da177e4 | 378 | { |
dde5828f | 379 | unsigned long min, max_low, max_high; |
1da177e4 | 380 | |
dde5828f RK |
381 | max_low = max_high = 0; |
382 | ||
f25b4b4c | 383 | find_limits(&min, &max_low, &max_high); |
dde5828f | 384 | |
a801d276 | 385 | arm_bootmem_init(min, max_low); |
dde5828f | 386 | |
be370302 RK |
387 | /* |
388 | * Sparsemem tries to allocate bootmem in memory_present(), | |
389 | * so must be done after the fixed reservations | |
390 | */ | |
eda2e5dc | 391 | arm_memory_present(); |
1da177e4 | 392 | |
b7a69ac3 RK |
393 | /* |
394 | * sparse_init() needs the bootmem allocator up and running. | |
395 | */ | |
396 | sparse_init(); | |
397 | ||
398 | /* | |
be370302 | 399 | * Now free the memory - free_area_init_node needs |
b7a69ac3 RK |
400 | * the sparse mem_map arrays initialized by sparse_init() |
401 | * for memmap_init_zone(), otherwise all PFNs are invalid. | |
402 | */ | |
a2c54d2a | 403 | arm_bootmem_free(min, max_low, max_high); |
b7a69ac3 | 404 | |
cae6292b | 405 | high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1; |
1da177e4 | 406 | |
90072059 RK |
407 | /* |
408 | * This doesn't seem to be used by the Linux memory manager any | |
409 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
410 | * also get rid of some of the stuff above as well. | |
411 | * | |
412 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in | |
413 | * the system, not the maximum PFN. | |
414 | */ | |
dde5828f RK |
415 | max_low_pfn = max_low - PHYS_PFN_OFFSET; |
416 | max_pfn = max_high - PHYS_PFN_OFFSET; | |
90072059 | 417 | } |
1da177e4 | 418 | |
6db015e4 | 419 | static inline int free_area(unsigned long pfn, unsigned long end, char *s) |
1da177e4 | 420 | { |
6db015e4 | 421 | unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); |
1da177e4 | 422 | |
6db015e4 NP |
423 | for (; pfn < end; pfn++) { |
424 | struct page *page = pfn_to_page(pfn); | |
1da177e4 | 425 | ClearPageReserved(page); |
7835e98b | 426 | init_page_count(page); |
6db015e4 NP |
427 | __free_page(page); |
428 | pages++; | |
1da177e4 LT |
429 | } |
430 | ||
431 | if (size && s) | |
432 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); | |
6db015e4 NP |
433 | |
434 | return pages; | |
1da177e4 LT |
435 | } |
436 | ||
54d52573 SB |
437 | /* |
438 | * Poison init memory with an undefined instruction (ARM) or a branch to an | |
439 | * undefined instruction (Thumb). | |
440 | */ | |
441 | static inline void poison_init_mem(void *s, size_t count) | |
442 | { | |
443 | u32 *p = (u32 *)s; | |
444 | while ((count = count - 4)) | |
445 | *p++ = 0xe7fddef0; | |
446 | } | |
447 | ||
a013053d | 448 | static inline void |
be370302 | 449 | free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
a013053d RK |
450 | { |
451 | struct page *start_pg, *end_pg; | |
452 | unsigned long pg, pgend; | |
453 | ||
454 | /* | |
455 | * Convert start_pfn/end_pfn to a struct page pointer. | |
456 | */ | |
3257f43d | 457 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
9af386c8 | 458 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
a013053d RK |
459 | |
460 | /* | |
461 | * Convert to physical addresses, and | |
462 | * round start upwards and end downwards. | |
463 | */ | |
cae6292b WD |
464 | pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); |
465 | pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; | |
a013053d RK |
466 | |
467 | /* | |
468 | * If there are free pages between these, | |
469 | * free the section of the memmap array. | |
470 | */ | |
471 | if (pg < pgend) | |
be370302 | 472 | free_bootmem(pg, pgend - pg); |
a013053d RK |
473 | } |
474 | ||
475 | /* | |
476 | * The mem_map array can get very big. Free the unused area of the memory map. | |
477 | */ | |
be370302 | 478 | static void __init free_unused_memmap(struct meminfo *mi) |
a013053d RK |
479 | { |
480 | unsigned long bank_start, prev_bank_end = 0; | |
481 | unsigned int i; | |
482 | ||
483 | /* | |
3260e529 MB |
484 | * This relies on each bank being in address order. |
485 | * The banks are sorted previously in bootmem_init(). | |
a013053d | 486 | */ |
be370302 | 487 | for_each_bank(i, mi) { |
d2a38ef9 RK |
488 | struct membank *bank = &mi->bank[i]; |
489 | ||
490 | bank_start = bank_pfn_start(bank); | |
a013053d | 491 | |
9af386c8 WD |
492 | #ifdef CONFIG_SPARSEMEM |
493 | /* | |
494 | * Take care not to free memmap entries that don't exist | |
495 | * due to SPARSEMEM sections which aren't present. | |
496 | */ | |
497 | bank_start = min(bank_start, | |
498 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); | |
499 | #endif | |
a013053d RK |
500 | /* |
501 | * If we had a previous bank, and there is a space | |
502 | * between the current bank and the previous, free it. | |
503 | */ | |
3260e529 | 504 | if (prev_bank_end && prev_bank_end < bank_start) |
be370302 | 505 | free_memmap(prev_bank_end, bank_start); |
a013053d | 506 | |
3260e529 MB |
507 | /* |
508 | * Align up here since the VM subsystem insists that the | |
509 | * memmap entries are valid from the bank end aligned to | |
510 | * MAX_ORDER_NR_PAGES. | |
511 | */ | |
512 | prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); | |
a013053d | 513 | } |
9af386c8 WD |
514 | |
515 | #ifdef CONFIG_SPARSEMEM | |
516 | if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) | |
517 | free_memmap(prev_bank_end, | |
518 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); | |
519 | #endif | |
a013053d RK |
520 | } |
521 | ||
d0e775af RK |
522 | static void __init free_highpages(void) |
523 | { | |
524 | #ifdef CONFIG_HIGHMEM | |
df4f14c7 RK |
525 | unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; |
526 | struct memblock_region *mem, *res; | |
d0e775af RK |
527 | |
528 | /* set highmem page free */ | |
df4f14c7 RK |
529 | for_each_memblock(memory, mem) { |
530 | unsigned long start = memblock_region_memory_base_pfn(mem); | |
531 | unsigned long end = memblock_region_memory_end_pfn(mem); | |
532 | ||
533 | /* Ignore complete lowmem entries */ | |
534 | if (end <= max_low) | |
535 | continue; | |
536 | ||
537 | /* Truncate partial highmem entries */ | |
538 | if (start < max_low) | |
539 | start = max_low; | |
540 | ||
541 | /* Find and exclude any reserved regions */ | |
542 | for_each_memblock(reserved, res) { | |
543 | unsigned long res_start, res_end; | |
544 | ||
545 | res_start = memblock_region_reserved_base_pfn(res); | |
546 | res_end = memblock_region_reserved_end_pfn(res); | |
547 | ||
548 | if (res_end < start) | |
549 | continue; | |
550 | if (res_start < start) | |
551 | res_start = start; | |
552 | if (res_start > end) | |
553 | res_start = end; | |
554 | if (res_end > end) | |
555 | res_end = end; | |
556 | if (res_start != start) | |
557 | totalhigh_pages += free_area(start, res_start, | |
558 | NULL); | |
559 | start = res_end; | |
560 | if (start == end) | |
561 | break; | |
562 | } | |
563 | ||
564 | /* And now free anything which remains */ | |
565 | if (start < end) | |
d0e775af RK |
566 | totalhigh_pages += free_area(start, end, NULL); |
567 | } | |
568 | totalram_pages += totalhigh_pages; | |
569 | #endif | |
570 | } | |
571 | ||
1da177e4 LT |
572 | /* |
573 | * mem_init() marks the free areas in the mem_map and tells us how much | |
574 | * memory is free. This is done after various parts of the system have | |
575 | * claimed their memory after the kernel image. | |
576 | */ | |
577 | void __init mem_init(void) | |
578 | { | |
db9ef1af | 579 | unsigned long reserved_pages, free_pages; |
47ea3c15 | 580 | struct memblock_region *reg; |
be370302 | 581 | int i; |
1dbd30e9 LW |
582 | #ifdef CONFIG_HAVE_TCM |
583 | /* These pointers are filled in on TCM detection */ | |
584 | extern u32 dtcm_end; | |
585 | extern u32 itcm_end; | |
586 | #endif | |
1da177e4 | 587 | |
3835f6cb | 588 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
1da177e4 | 589 | |
1da177e4 | 590 | /* this will put all unused low memory onto the freelists */ |
be370302 | 591 | free_unused_memmap(&meminfo); |
a013053d | 592 | |
be370302 | 593 | totalram_pages += free_all_bootmem(); |
1da177e4 LT |
594 | |
595 | #ifdef CONFIG_SA1111 | |
596 | /* now that our DMA memory is actually so designated, we can free it */ | |
6db015e4 NP |
597 | totalram_pages += free_area(PHYS_PFN_OFFSET, |
598 | __phys_to_pfn(__pa(swapper_pg_dir)), NULL); | |
1da177e4 LT |
599 | #endif |
600 | ||
d0e775af | 601 | free_highpages(); |
3835f6cb | 602 | |
db9ef1af FB |
603 | reserved_pages = free_pages = 0; |
604 | ||
be370302 RK |
605 | for_each_bank(i, &meminfo) { |
606 | struct membank *bank = &meminfo.bank[i]; | |
607 | unsigned int pfn1, pfn2; | |
608 | struct page *page, *end; | |
609 | ||
610 | pfn1 = bank_pfn_start(bank); | |
611 | pfn2 = bank_pfn_end(bank); | |
612 | ||
613 | page = pfn_to_page(pfn1); | |
614 | end = pfn_to_page(pfn2 - 1) + 1; | |
615 | ||
616 | do { | |
617 | if (PageReserved(page)) | |
618 | reserved_pages++; | |
619 | else if (!page_count(page)) | |
620 | free_pages++; | |
621 | page++; | |
622 | } while (page < end); | |
db9ef1af FB |
623 | } |
624 | ||
1da177e4 LT |
625 | /* |
626 | * Since our memory may not be contiguous, calculate the | |
627 | * real number of pages we have in this system | |
628 | */ | |
629 | printk(KERN_INFO "Memory:"); | |
1da177e4 | 630 | num_physpages = 0; |
47ea3c15 RK |
631 | for_each_memblock(memory, reg) { |
632 | unsigned long pages = memblock_region_memory_end_pfn(reg) - | |
633 | memblock_region_memory_base_pfn(reg); | |
634 | num_physpages += pages; | |
635 | printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); | |
1da177e4 | 636 | } |
1da177e4 | 637 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); |
6db015e4 | 638 | |
db9ef1af FB |
639 | printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", |
640 | nr_free_pages() << (PAGE_SHIFT-10), | |
641 | free_pages << (PAGE_SHIFT-10), | |
642 | reserved_pages << (PAGE_SHIFT-10), | |
4b529401 | 643 | totalhigh_pages << (PAGE_SHIFT-10)); |
1da177e4 | 644 | |
db9ef1af FB |
645 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
646 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
647 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
648 | ||
649 | printk(KERN_NOTICE "Virtual kernel memory layout:\n" | |
650 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
07d2a5c7 | 651 | #ifdef CONFIG_HAVE_TCM |
07d2a5c7 | 652 | " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 653 | " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 654 | #endif |
db9ef1af | 655 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
a7bd08c8 FB |
656 | #ifdef CONFIG_MMU |
657 | " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
658 | #endif | |
db9ef1af FB |
659 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
660 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
661 | #ifdef CONFIG_HIGHMEM | |
662 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
663 | #endif | |
664 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
db9ef1af | 665 | " .text : 0x%p" " - 0x%p" " (%4d kB)\n" |
3835d69a | 666 | " .init : 0x%p" " - 0x%p" " (%4d kB)\n" |
45f6d7e0 RV |
667 | " .data : 0x%p" " - 0x%p" " (%4d kB)\n" |
668 | " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", | |
db9ef1af FB |
669 | |
670 | MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + | |
671 | (PAGE_SIZE)), | |
07d2a5c7 | 672 | #ifdef CONFIG_HAVE_TCM |
1dbd30e9 LW |
673 | MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
674 | MLK(ITCM_OFFSET, (unsigned long) itcm_end), | |
07d2a5c7 | 675 | #endif |
db9ef1af | 676 | MLK(FIXADDR_START, FIXADDR_TOP), |
a7bd08c8 FB |
677 | #ifdef CONFIG_MMU |
678 | MLM(CONSISTENT_BASE, CONSISTENT_END), | |
679 | #endif | |
c931b4f6 | 680 | MLM(VMALLOC_START, VMALLOC_END), |
db9ef1af FB |
681 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
682 | #ifdef CONFIG_HIGHMEM | |
683 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * | |
684 | (PAGE_SIZE)), | |
685 | #endif | |
686 | MLM(MODULES_VADDR, MODULES_END), | |
687 | ||
db9ef1af | 688 | MLK_ROUNDUP(_text, _etext), |
3835d69a | 689 | MLK_ROUNDUP(__init_begin, __init_end), |
45f6d7e0 RV |
690 | MLK_ROUNDUP(_sdata, _edata), |
691 | MLK_ROUNDUP(__bss_start, __bss_stop)); | |
db9ef1af FB |
692 | |
693 | #undef MLK | |
694 | #undef MLM | |
695 | #undef MLK_ROUNDUP | |
696 | ||
a1839272 FB |
697 | /* |
698 | * Check boundaries twice: Some fundamental inconsistencies can | |
699 | * be detected at build time already. | |
700 | */ | |
701 | #ifdef CONFIG_MMU | |
702 | BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); | |
703 | BUG_ON(VMALLOC_END > CONSISTENT_BASE); | |
704 | ||
705 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); | |
706 | BUG_ON(TASK_SIZE > MODULES_VADDR); | |
707 | #endif | |
708 | ||
709 | #ifdef CONFIG_HIGHMEM | |
710 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
711 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
712 | #endif | |
713 | ||
1da177e4 LT |
714 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { |
715 | extern int sysctl_overcommit_memory; | |
716 | /* | |
717 | * On a machine this small we won't get | |
718 | * anywhere without overcommit, so turn | |
719 | * it on by default. | |
720 | */ | |
721 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
722 | } | |
723 | } | |
724 | ||
725 | void free_initmem(void) | |
726 | { | |
bc581770 | 727 | #ifdef CONFIG_HAVE_TCM |
ea208f64 | 728 | extern char __tcm_start, __tcm_end; |
bc581770 | 729 | |
54d52573 | 730 | poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); |
ea208f64 LW |
731 | totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), |
732 | __phys_to_pfn(__pa(&__tcm_end)), | |
bc581770 LW |
733 | "TCM link"); |
734 | #endif | |
735 | ||
54d52573 | 736 | poison_init_mem(__init_begin, __init_end - __init_begin); |
6db015e4 | 737 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
37efe642 RK |
738 | totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), |
739 | __phys_to_pfn(__pa(__init_end)), | |
6db015e4 | 740 | "init"); |
1da177e4 LT |
741 | } |
742 | ||
743 | #ifdef CONFIG_BLK_DEV_INITRD | |
744 | ||
745 | static int keep_initrd; | |
746 | ||
747 | void free_initrd_mem(unsigned long start, unsigned long end) | |
748 | { | |
54d52573 SB |
749 | if (!keep_initrd) { |
750 | poison_init_mem((void *)start, PAGE_ALIGN(end) - start); | |
6db015e4 NP |
751 | totalram_pages += free_area(__phys_to_pfn(__pa(start)), |
752 | __phys_to_pfn(__pa(end)), | |
753 | "initrd"); | |
54d52573 | 754 | } |
1da177e4 LT |
755 | } |
756 | ||
757 | static int __init keepinitrd_setup(char *__unused) | |
758 | { | |
759 | keep_initrd = 1; | |
760 | return 1; | |
761 | } | |
762 | ||
763 | __setup("keepinitrd", keepinitrd_setup); | |
764 | #endif |