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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/mm/init.c | |
3 | * | |
90072059 | 4 | * Copyright (C) 1995-2005 Russell King |
1da177e4 LT |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
1da177e4 LT |
10 | #include <linux/kernel.h> |
11 | #include <linux/errno.h> | |
1da177e4 LT |
12 | #include <linux/swap.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/bootmem.h> | |
15 | #include <linux/mman.h> | |
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> |
7dc50ec7 | 23 | #include <linux/sort.h> |
1da177e4 LT |
24 | |
25 | #include <asm/mach-types.h> | |
93c02ab4 | 26 | #include <asm/prom.h> |
37efe642 | 27 | #include <asm/sections.h> |
1da177e4 | 28 | #include <asm/setup.h> |
74d02fb9 | 29 | #include <asm/sizes.h> |
1da177e4 | 30 | #include <asm/tlb.h> |
db9ef1af | 31 | #include <asm/fixmap.h> |
1da177e4 LT |
32 | |
33 | #include <asm/mach/arch.h> | |
34 | #include <asm/mach/map.h> | |
35 | ||
1b2e2b73 RK |
36 | #include "mm.h" |
37 | ||
012d1f4a RK |
38 | static unsigned long phys_initrd_start __initdata = 0; |
39 | static unsigned long phys_initrd_size __initdata = 0; | |
40 | ||
2b0d8c25 | 41 | static int __init early_initrd(char *p) |
012d1f4a RK |
42 | { |
43 | unsigned long start, size; | |
2b0d8c25 | 44 | char *endp; |
012d1f4a | 45 | |
2b0d8c25 JK |
46 | start = memparse(p, &endp); |
47 | if (*endp == ',') { | |
48 | size = memparse(endp + 1, NULL); | |
012d1f4a RK |
49 | |
50 | phys_initrd_start = start; | |
51 | phys_initrd_size = size; | |
52 | } | |
2b0d8c25 | 53 | return 0; |
012d1f4a | 54 | } |
2b0d8c25 | 55 | early_param("initrd", early_initrd); |
012d1f4a RK |
56 | |
57 | static int __init parse_tag_initrd(const struct tag *tag) | |
58 | { | |
59 | printk(KERN_WARNING "ATAG_INITRD is deprecated; " | |
60 | "please update your bootloader.\n"); | |
61 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); | |
62 | phys_initrd_size = tag->u.initrd.size; | |
63 | return 0; | |
64 | } | |
65 | ||
66 | __tagtable(ATAG_INITRD, parse_tag_initrd); | |
67 | ||
68 | static int __init parse_tag_initrd2(const struct tag *tag) | |
69 | { | |
70 | phys_initrd_start = tag->u.initrd.start; | |
71 | phys_initrd_size = tag->u.initrd.size; | |
72 | return 0; | |
73 | } | |
74 | ||
75 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); | |
1da177e4 | 76 | |
9eb8f674 GL |
77 | #ifdef CONFIG_OF_FLATTREE |
78 | void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end) | |
79 | { | |
80 | phys_initrd_start = start; | |
81 | phys_initrd_size = end - start; | |
82 | } | |
83 | #endif /* CONFIG_OF_FLATTREE */ | |
84 | ||
1da177e4 | 85 | /* |
4b5f32ce NP |
86 | * This keeps memory configuration data used by a couple memory |
87 | * initialization functions, as well as show_mem() for the skipping | |
88 | * of holes in the memory map. It is populated by arm_add_memory(). | |
1da177e4 | 89 | */ |
4b5f32ce | 90 | struct meminfo meminfo; |
5e709827 | 91 | |
b2b755b5 | 92 | void show_mem(unsigned int filter) |
1da177e4 LT |
93 | { |
94 | int free = 0, total = 0, reserved = 0; | |
be370302 | 95 | int shared = 0, cached = 0, slab = 0, i; |
5e709827 | 96 | struct meminfo * mi = &meminfo; |
1da177e4 LT |
97 | |
98 | printk("Mem-info:\n"); | |
7bf02ea2 | 99 | show_free_areas(filter); |
be370302 RK |
100 | |
101 | for_each_bank (i, mi) { | |
102 | struct membank *bank = &mi->bank[i]; | |
103 | unsigned int pfn1, pfn2; | |
104 | struct page *page, *end; | |
105 | ||
106 | pfn1 = bank_pfn_start(bank); | |
107 | pfn2 = bank_pfn_end(bank); | |
108 | ||
109 | page = pfn_to_page(pfn1); | |
110 | end = pfn_to_page(pfn2 - 1) + 1; | |
111 | ||
112 | do { | |
113 | total++; | |
114 | if (PageReserved(page)) | |
115 | reserved++; | |
116 | else if (PageSwapCache(page)) | |
117 | cached++; | |
118 | else if (PageSlab(page)) | |
119 | slab++; | |
120 | else if (!page_count(page)) | |
121 | free++; | |
122 | else | |
123 | shared += page_count(page) - 1; | |
124 | page++; | |
125 | } while (page < end); | |
1da177e4 LT |
126 | } |
127 | ||
128 | printk("%d pages of RAM\n", total); | |
129 | printk("%d free pages\n", free); | |
130 | printk("%d reserved pages\n", reserved); | |
131 | printk("%d slab pages\n", slab); | |
132 | printk("%d pages shared\n", shared); | |
133 | printk("%d pages swap cached\n", cached); | |
134 | } | |
135 | ||
f25b4b4c RK |
136 | static void __init find_limits(unsigned long *min, unsigned long *max_low, |
137 | unsigned long *max_high) | |
dde5828f | 138 | { |
f25b4b4c | 139 | struct meminfo *mi = &meminfo; |
dde5828f RK |
140 | int i; |
141 | ||
142 | *min = -1UL; | |
143 | *max_low = *max_high = 0; | |
144 | ||
be370302 | 145 | for_each_bank (i, mi) { |
dde5828f RK |
146 | struct membank *bank = &mi->bank[i]; |
147 | unsigned long start, end; | |
148 | ||
149 | start = bank_pfn_start(bank); | |
150 | end = bank_pfn_end(bank); | |
151 | ||
152 | if (*min > start) | |
153 | *min = start; | |
154 | if (*max_high < end) | |
155 | *max_high = end; | |
156 | if (bank->highmem) | |
157 | continue; | |
158 | if (*max_low < end) | |
159 | *max_low = end; | |
160 | } | |
161 | } | |
162 | ||
a801d276 RK |
163 | static void __init arm_bootmem_init(unsigned long start_pfn, |
164 | unsigned long end_pfn) | |
1da177e4 | 165 | { |
719c1514 | 166 | struct memblock_region *reg; |
90072059 | 167 | unsigned int boot_pages; |
2778f620 | 168 | phys_addr_t bitmap; |
90072059 | 169 | pg_data_t *pgdat; |
1da177e4 | 170 | |
90072059 | 171 | /* |
2778f620 RK |
172 | * Allocate the bootmem bitmap page. This must be in a region |
173 | * of memory which has already been mapped. | |
90072059 RK |
174 | */ |
175 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
2778f620 RK |
176 | bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, |
177 | __pfn_to_phys(end_pfn)); | |
1da177e4 | 178 | |
90072059 | 179 | /* |
be370302 | 180 | * Initialise the bootmem allocator, handing the |
90072059 RK |
181 | * memory banks over to bootmem. |
182 | */ | |
be370302 RK |
183 | node_set_online(0); |
184 | pgdat = NODE_DATA(0); | |
2778f620 | 185 | init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); |
1da177e4 | 186 | |
a801d276 RK |
187 | /* Free the lowmem regions from memblock into bootmem. */ |
188 | for_each_memblock(memory, reg) { | |
189 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
190 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
191 | ||
192 | if (end >= end_pfn) | |
193 | end = end_pfn; | |
194 | if (start >= end) | |
195 | break; | |
196 | ||
197 | free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); | |
d2a38ef9 | 198 | } |
90072059 | 199 | |
a801d276 | 200 | /* Reserve the lowmem memblock reserved regions in bootmem. */ |
719c1514 | 201 | for_each_memblock(reserved, reg) { |
a801d276 RK |
202 | unsigned long start = memblock_region_reserved_base_pfn(reg); |
203 | unsigned long end = memblock_region_reserved_end_pfn(reg); | |
204 | ||
205 | if (end >= end_pfn) | |
206 | end = end_pfn; | |
207 | if (start >= end) | |
208 | break; | |
209 | ||
210 | reserve_bootmem(__pfn_to_phys(start), | |
211 | (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); | |
1da177e4 | 212 | } |
b7a69ac3 RK |
213 | } |
214 | ||
be20902b | 215 | #ifdef CONFIG_ZONE_DMA |
65032018 | 216 | |
65032018 | 217 | unsigned long arm_dma_zone_size __read_mostly; |
65032018 NP |
218 | EXPORT_SYMBOL(arm_dma_zone_size); |
219 | ||
022ae537 RK |
220 | /* |
221 | * The DMA mask corresponding to the maximum bus address allocatable | |
222 | * using GFP_DMA. The default here places no restriction on DMA | |
223 | * allocations. This must be the smallest DMA mask in the system, | |
224 | * so a successful GFP_DMA allocation will always satisfy this. | |
225 | */ | |
226 | u32 arm_dma_limit; | |
227 | ||
be20902b RK |
228 | static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, |
229 | unsigned long dma_size) | |
230 | { | |
231 | if (size[0] <= dma_size) | |
232 | return; | |
233 | ||
234 | size[ZONE_NORMAL] = size[0] - dma_size; | |
235 | size[ZONE_DMA] = dma_size; | |
236 | hole[ZONE_NORMAL] = hole[0]; | |
237 | hole[ZONE_DMA] = 0; | |
238 | } | |
239 | #endif | |
240 | ||
a2c54d2a RK |
241 | static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, |
242 | unsigned long max_high) | |
b7a69ac3 RK |
243 | { |
244 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
a2c54d2a | 245 | struct memblock_region *reg; |
b7a69ac3 | 246 | |
90072059 | 247 | /* |
be370302 | 248 | * initialise the zones. |
90072059 RK |
249 | */ |
250 | memset(zone_size, 0, sizeof(zone_size)); | |
90072059 RK |
251 | |
252 | /* | |
be370302 RK |
253 | * The memory size has already been determined. If we need |
254 | * to do anything fancy with the allocation of this memory | |
255 | * to the zones, now is the time to do it. | |
90072059 | 256 | */ |
dde5828f RK |
257 | zone_size[0] = max_low - min; |
258 | #ifdef CONFIG_HIGHMEM | |
259 | zone_size[ZONE_HIGHMEM] = max_high - max_low; | |
260 | #endif | |
90072059 RK |
261 | |
262 | /* | |
be370302 RK |
263 | * Calculate the size of the holes. |
264 | * holes = node_size - sum(bank_sizes) | |
90072059 | 265 | */ |
dde5828f | 266 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
a2c54d2a RK |
267 | for_each_memblock(memory, reg) { |
268 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
269 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
270 | ||
271 | if (start < max_low) { | |
272 | unsigned long low_end = min(end, max_low); | |
273 | zhole_size[0] -= low_end - start; | |
274 | } | |
dde5828f | 275 | #ifdef CONFIG_HIGHMEM |
a2c54d2a RK |
276 | if (end > max_low) { |
277 | unsigned long high_start = max(start, max_low); | |
278 | zhole_size[ZONE_HIGHMEM] -= end - high_start; | |
279 | } | |
dde5828f | 280 | #endif |
dde5828f | 281 | } |
90072059 | 282 | |
65032018 | 283 | #ifdef CONFIG_ZONE_DMA |
90072059 RK |
284 | /* |
285 | * Adjust the sizes according to any special requirements for | |
286 | * this machine type. | |
287 | */ | |
65032018 NP |
288 | if (arm_dma_zone_size) { |
289 | arm_adjust_dma_zone(zone_size, zhole_size, | |
290 | arm_dma_zone_size >> PAGE_SHIFT); | |
291 | arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; | |
292 | } else | |
293 | arm_dma_limit = 0xffffffff; | |
be20902b | 294 | #endif |
90072059 | 295 | |
be370302 | 296 | free_area_init_node(0, zone_size, min, zhole_size); |
1da177e4 LT |
297 | } |
298 | ||
7b7bf499 | 299 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
b7cfda9f RK |
300 | int pfn_valid(unsigned long pfn) |
301 | { | |
fb492c91 | 302 | return memblock_is_memory(__pfn_to_phys(pfn)); |
b7cfda9f RK |
303 | } |
304 | EXPORT_SYMBOL(pfn_valid); | |
7b7bf499 | 305 | #endif |
657e12fd | 306 | |
7b7bf499 | 307 | #ifndef CONFIG_SPARSEMEM |
eda2e5dc | 308 | static void arm_memory_present(void) |
657e12fd RK |
309 | { |
310 | } | |
311 | #else | |
eda2e5dc | 312 | static void arm_memory_present(void) |
657e12fd | 313 | { |
719c1514 | 314 | struct memblock_region *reg; |
719c1514 | 315 | |
7c996361 | 316 | for_each_memblock(memory, reg) |
c7fc2de0 YL |
317 | memory_present(0, memblock_region_memory_base_pfn(reg), |
318 | memblock_region_memory_end_pfn(reg)); | |
657e12fd | 319 | } |
b7cfda9f RK |
320 | #endif |
321 | ||
7dc50ec7 RK |
322 | static int __init meminfo_cmp(const void *_a, const void *_b) |
323 | { | |
324 | const struct membank *a = _a, *b = _b; | |
325 | long cmp = bank_pfn_start(a) - bank_pfn_start(b); | |
326 | return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; | |
327 | } | |
328 | ||
8d717a52 | 329 | void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) |
2778f620 RK |
330 | { |
331 | int i; | |
332 | ||
7dc50ec7 RK |
333 | sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL); |
334 | ||
2778f620 RK |
335 | memblock_init(); |
336 | for (i = 0; i < mi->nr_banks; i++) | |
337 | memblock_add(mi->bank[i].start, mi->bank[i].size); | |
338 | ||
339 | /* Register the kernel text, kernel data and initrd with memblock. */ | |
340 | #ifdef CONFIG_XIP_KERNEL | |
842eab40 | 341 | memblock_reserve(__pa(_sdata), _end - _sdata); |
2778f620 RK |
342 | #else |
343 | memblock_reserve(__pa(_stext), _end - _stext); | |
344 | #endif | |
345 | #ifdef CONFIG_BLK_DEV_INITRD | |
8f4b8c76 RK |
346 | if (phys_initrd_size && |
347 | !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { | |
348 | pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n", | |
349 | phys_initrd_start, phys_initrd_size); | |
350 | phys_initrd_start = phys_initrd_size = 0; | |
351 | } | |
b0a2679d RK |
352 | if (phys_initrd_size && |
353 | memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { | |
354 | pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n", | |
355 | phys_initrd_start, phys_initrd_size); | |
356 | phys_initrd_start = phys_initrd_size = 0; | |
357 | } | |
2778f620 RK |
358 | if (phys_initrd_size) { |
359 | memblock_reserve(phys_initrd_start, phys_initrd_size); | |
360 | ||
361 | /* Now convert initrd to virtual addresses */ | |
362 | initrd_start = __phys_to_virt(phys_initrd_start); | |
363 | initrd_end = initrd_start + phys_initrd_size; | |
364 | } | |
365 | #endif | |
366 | ||
367 | arm_mm_memblock_reserve(); | |
93c02ab4 | 368 | arm_dt_memblock_reserve(); |
2778f620 | 369 | |
8d717a52 RK |
370 | /* reserve any platform specific memblock areas */ |
371 | if (mdesc->reserve) | |
372 | mdesc->reserve(); | |
373 | ||
2778f620 RK |
374 | memblock_analyze(); |
375 | memblock_dump_all(); | |
376 | } | |
377 | ||
8d717a52 | 378 | void __init bootmem_init(void) |
1da177e4 | 379 | { |
dde5828f | 380 | unsigned long min, max_low, max_high; |
1da177e4 | 381 | |
dde5828f RK |
382 | max_low = max_high = 0; |
383 | ||
f25b4b4c | 384 | find_limits(&min, &max_low, &max_high); |
dde5828f | 385 | |
a801d276 | 386 | arm_bootmem_init(min, max_low); |
dde5828f | 387 | |
be370302 RK |
388 | /* |
389 | * Sparsemem tries to allocate bootmem in memory_present(), | |
390 | * so must be done after the fixed reservations | |
391 | */ | |
eda2e5dc | 392 | arm_memory_present(); |
1da177e4 | 393 | |
b7a69ac3 RK |
394 | /* |
395 | * sparse_init() needs the bootmem allocator up and running. | |
396 | */ | |
397 | sparse_init(); | |
398 | ||
399 | /* | |
be370302 | 400 | * Now free the memory - free_area_init_node needs |
b7a69ac3 RK |
401 | * the sparse mem_map arrays initialized by sparse_init() |
402 | * for memmap_init_zone(), otherwise all PFNs are invalid. | |
403 | */ | |
a2c54d2a | 404 | arm_bootmem_free(min, max_low, max_high); |
b7a69ac3 | 405 | |
cae6292b | 406 | high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1; |
1da177e4 | 407 | |
90072059 RK |
408 | /* |
409 | * This doesn't seem to be used by the Linux memory manager any | |
410 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
411 | * also get rid of some of the stuff above as well. | |
412 | * | |
413 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in | |
414 | * the system, not the maximum PFN. | |
415 | */ | |
dde5828f RK |
416 | max_low_pfn = max_low - PHYS_PFN_OFFSET; |
417 | max_pfn = max_high - PHYS_PFN_OFFSET; | |
90072059 | 418 | } |
1da177e4 | 419 | |
6db015e4 | 420 | static inline int free_area(unsigned long pfn, unsigned long end, char *s) |
1da177e4 | 421 | { |
6db015e4 | 422 | unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); |
1da177e4 | 423 | |
6db015e4 NP |
424 | for (; pfn < end; pfn++) { |
425 | struct page *page = pfn_to_page(pfn); | |
1da177e4 | 426 | ClearPageReserved(page); |
7835e98b | 427 | init_page_count(page); |
6db015e4 NP |
428 | __free_page(page); |
429 | pages++; | |
1da177e4 LT |
430 | } |
431 | ||
432 | if (size && s) | |
433 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); | |
6db015e4 NP |
434 | |
435 | return pages; | |
1da177e4 LT |
436 | } |
437 | ||
54d52573 SB |
438 | /* |
439 | * Poison init memory with an undefined instruction (ARM) or a branch to an | |
440 | * undefined instruction (Thumb). | |
441 | */ | |
442 | static inline void poison_init_mem(void *s, size_t count) | |
443 | { | |
444 | u32 *p = (u32 *)s; | |
bf912d99 | 445 | for (; count != 0; count -= 4) |
54d52573 SB |
446 | *p++ = 0xe7fddef0; |
447 | } | |
448 | ||
a013053d | 449 | static inline void |
be370302 | 450 | free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
a013053d RK |
451 | { |
452 | struct page *start_pg, *end_pg; | |
453 | unsigned long pg, pgend; | |
454 | ||
455 | /* | |
456 | * Convert start_pfn/end_pfn to a struct page pointer. | |
457 | */ | |
3257f43d | 458 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
9af386c8 | 459 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
a013053d RK |
460 | |
461 | /* | |
462 | * Convert to physical addresses, and | |
463 | * round start upwards and end downwards. | |
464 | */ | |
cae6292b WD |
465 | pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); |
466 | pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; | |
a013053d RK |
467 | |
468 | /* | |
469 | * If there are free pages between these, | |
470 | * free the section of the memmap array. | |
471 | */ | |
472 | if (pg < pgend) | |
be370302 | 473 | free_bootmem(pg, pgend - pg); |
a013053d RK |
474 | } |
475 | ||
476 | /* | |
477 | * The mem_map array can get very big. Free the unused area of the memory map. | |
478 | */ | |
be370302 | 479 | static void __init free_unused_memmap(struct meminfo *mi) |
a013053d RK |
480 | { |
481 | unsigned long bank_start, prev_bank_end = 0; | |
482 | unsigned int i; | |
483 | ||
484 | /* | |
3260e529 MB |
485 | * This relies on each bank being in address order. |
486 | * The banks are sorted previously in bootmem_init(). | |
a013053d | 487 | */ |
be370302 | 488 | for_each_bank(i, mi) { |
d2a38ef9 RK |
489 | struct membank *bank = &mi->bank[i]; |
490 | ||
491 | bank_start = bank_pfn_start(bank); | |
a013053d | 492 | |
9af386c8 WD |
493 | #ifdef CONFIG_SPARSEMEM |
494 | /* | |
495 | * Take care not to free memmap entries that don't exist | |
496 | * due to SPARSEMEM sections which aren't present. | |
497 | */ | |
498 | bank_start = min(bank_start, | |
499 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); | |
002ea9ee LW |
500 | #else |
501 | /* | |
502 | * Align down here since the VM subsystem insists that the | |
503 | * memmap entries are valid from the bank start aligned to | |
504 | * MAX_ORDER_NR_PAGES. | |
505 | */ | |
506 | bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES); | |
9af386c8 | 507 | #endif |
a013053d RK |
508 | /* |
509 | * If we had a previous bank, and there is a space | |
510 | * between the current bank and the previous, free it. | |
511 | */ | |
3260e529 | 512 | if (prev_bank_end && prev_bank_end < bank_start) |
be370302 | 513 | free_memmap(prev_bank_end, bank_start); |
a013053d | 514 | |
3260e529 MB |
515 | /* |
516 | * Align up here since the VM subsystem insists that the | |
517 | * memmap entries are valid from the bank end aligned to | |
518 | * MAX_ORDER_NR_PAGES. | |
519 | */ | |
520 | prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); | |
a013053d | 521 | } |
9af386c8 WD |
522 | |
523 | #ifdef CONFIG_SPARSEMEM | |
524 | if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) | |
525 | free_memmap(prev_bank_end, | |
526 | ALIGN(prev_bank_end, PAGES_PER_SECTION)); | |
527 | #endif | |
a013053d RK |
528 | } |
529 | ||
d0e775af RK |
530 | static void __init free_highpages(void) |
531 | { | |
532 | #ifdef CONFIG_HIGHMEM | |
df4f14c7 RK |
533 | unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; |
534 | struct memblock_region *mem, *res; | |
d0e775af RK |
535 | |
536 | /* set highmem page free */ | |
df4f14c7 RK |
537 | for_each_memblock(memory, mem) { |
538 | unsigned long start = memblock_region_memory_base_pfn(mem); | |
539 | unsigned long end = memblock_region_memory_end_pfn(mem); | |
540 | ||
541 | /* Ignore complete lowmem entries */ | |
542 | if (end <= max_low) | |
543 | continue; | |
544 | ||
545 | /* Truncate partial highmem entries */ | |
546 | if (start < max_low) | |
547 | start = max_low; | |
548 | ||
549 | /* Find and exclude any reserved regions */ | |
550 | for_each_memblock(reserved, res) { | |
551 | unsigned long res_start, res_end; | |
552 | ||
553 | res_start = memblock_region_reserved_base_pfn(res); | |
554 | res_end = memblock_region_reserved_end_pfn(res); | |
555 | ||
556 | if (res_end < start) | |
557 | continue; | |
558 | if (res_start < start) | |
559 | res_start = start; | |
560 | if (res_start > end) | |
561 | res_start = end; | |
562 | if (res_end > end) | |
563 | res_end = end; | |
564 | if (res_start != start) | |
565 | totalhigh_pages += free_area(start, res_start, | |
566 | NULL); | |
567 | start = res_end; | |
568 | if (start == end) | |
569 | break; | |
570 | } | |
571 | ||
572 | /* And now free anything which remains */ | |
573 | if (start < end) | |
d0e775af RK |
574 | totalhigh_pages += free_area(start, end, NULL); |
575 | } | |
576 | totalram_pages += totalhigh_pages; | |
577 | #endif | |
578 | } | |
579 | ||
1da177e4 LT |
580 | /* |
581 | * mem_init() marks the free areas in the mem_map and tells us how much | |
582 | * memory is free. This is done after various parts of the system have | |
583 | * claimed their memory after the kernel image. | |
584 | */ | |
585 | void __init mem_init(void) | |
586 | { | |
db9ef1af | 587 | unsigned long reserved_pages, free_pages; |
47ea3c15 | 588 | struct memblock_region *reg; |
be370302 | 589 | int i; |
1dbd30e9 LW |
590 | #ifdef CONFIG_HAVE_TCM |
591 | /* These pointers are filled in on TCM detection */ | |
592 | extern u32 dtcm_end; | |
593 | extern u32 itcm_end; | |
594 | #endif | |
1da177e4 | 595 | |
3835f6cb | 596 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
1da177e4 | 597 | |
1da177e4 | 598 | /* this will put all unused low memory onto the freelists */ |
be370302 | 599 | free_unused_memmap(&meminfo); |
a013053d | 600 | |
be370302 | 601 | totalram_pages += free_all_bootmem(); |
1da177e4 LT |
602 | |
603 | #ifdef CONFIG_SA1111 | |
604 | /* now that our DMA memory is actually so designated, we can free it */ | |
6db015e4 NP |
605 | totalram_pages += free_area(PHYS_PFN_OFFSET, |
606 | __phys_to_pfn(__pa(swapper_pg_dir)), NULL); | |
1da177e4 LT |
607 | #endif |
608 | ||
d0e775af | 609 | free_highpages(); |
3835f6cb | 610 | |
db9ef1af FB |
611 | reserved_pages = free_pages = 0; |
612 | ||
be370302 RK |
613 | for_each_bank(i, &meminfo) { |
614 | struct membank *bank = &meminfo.bank[i]; | |
615 | unsigned int pfn1, pfn2; | |
616 | struct page *page, *end; | |
617 | ||
618 | pfn1 = bank_pfn_start(bank); | |
619 | pfn2 = bank_pfn_end(bank); | |
620 | ||
621 | page = pfn_to_page(pfn1); | |
622 | end = pfn_to_page(pfn2 - 1) + 1; | |
623 | ||
624 | do { | |
625 | if (PageReserved(page)) | |
626 | reserved_pages++; | |
627 | else if (!page_count(page)) | |
628 | free_pages++; | |
629 | page++; | |
630 | } while (page < end); | |
db9ef1af FB |
631 | } |
632 | ||
1da177e4 LT |
633 | /* |
634 | * Since our memory may not be contiguous, calculate the | |
635 | * real number of pages we have in this system | |
636 | */ | |
637 | printk(KERN_INFO "Memory:"); | |
1da177e4 | 638 | num_physpages = 0; |
47ea3c15 RK |
639 | for_each_memblock(memory, reg) { |
640 | unsigned long pages = memblock_region_memory_end_pfn(reg) - | |
641 | memblock_region_memory_base_pfn(reg); | |
642 | num_physpages += pages; | |
643 | printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); | |
1da177e4 | 644 | } |
1da177e4 | 645 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); |
6db015e4 | 646 | |
db9ef1af FB |
647 | printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", |
648 | nr_free_pages() << (PAGE_SHIFT-10), | |
649 | free_pages << (PAGE_SHIFT-10), | |
650 | reserved_pages << (PAGE_SHIFT-10), | |
4b529401 | 651 | totalhigh_pages << (PAGE_SHIFT-10)); |
1da177e4 | 652 | |
db9ef1af FB |
653 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
654 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
655 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
656 | ||
657 | printk(KERN_NOTICE "Virtual kernel memory layout:\n" | |
658 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
07d2a5c7 | 659 | #ifdef CONFIG_HAVE_TCM |
07d2a5c7 | 660 | " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 661 | " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
07d2a5c7 | 662 | #endif |
db9ef1af FB |
663 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
664 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
665 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
666 | #ifdef CONFIG_HIGHMEM | |
667 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
668 | #endif | |
669 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
db9ef1af | 670 | " .text : 0x%p" " - 0x%p" " (%4d kB)\n" |
3835d69a | 671 | " .init : 0x%p" " - 0x%p" " (%4d kB)\n" |
45f6d7e0 RV |
672 | " .data : 0x%p" " - 0x%p" " (%4d kB)\n" |
673 | " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", | |
db9ef1af FB |
674 | |
675 | MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + | |
676 | (PAGE_SIZE)), | |
07d2a5c7 | 677 | #ifdef CONFIG_HAVE_TCM |
1dbd30e9 LW |
678 | MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
679 | MLK(ITCM_OFFSET, (unsigned long) itcm_end), | |
07d2a5c7 | 680 | #endif |
db9ef1af | 681 | MLK(FIXADDR_START, FIXADDR_TOP), |
c931b4f6 | 682 | MLM(VMALLOC_START, VMALLOC_END), |
db9ef1af FB |
683 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
684 | #ifdef CONFIG_HIGHMEM | |
685 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * | |
686 | (PAGE_SIZE)), | |
687 | #endif | |
688 | MLM(MODULES_VADDR, MODULES_END), | |
689 | ||
db9ef1af | 690 | MLK_ROUNDUP(_text, _etext), |
3835d69a | 691 | MLK_ROUNDUP(__init_begin, __init_end), |
45f6d7e0 RV |
692 | MLK_ROUNDUP(_sdata, _edata), |
693 | MLK_ROUNDUP(__bss_start, __bss_stop)); | |
db9ef1af FB |
694 | |
695 | #undef MLK | |
696 | #undef MLM | |
697 | #undef MLK_ROUNDUP | |
698 | ||
a1839272 FB |
699 | /* |
700 | * Check boundaries twice: Some fundamental inconsistencies can | |
701 | * be detected at build time already. | |
702 | */ | |
703 | #ifdef CONFIG_MMU | |
a1839272 FB |
704 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
705 | BUG_ON(TASK_SIZE > MODULES_VADDR); | |
706 | #endif | |
707 | ||
708 | #ifdef CONFIG_HIGHMEM | |
709 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
710 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
711 | #endif | |
712 | ||
1da177e4 LT |
713 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { |
714 | extern int sysctl_overcommit_memory; | |
715 | /* | |
716 | * On a machine this small we won't get | |
717 | * anywhere without overcommit, so turn | |
718 | * it on by default. | |
719 | */ | |
720 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
721 | } | |
722 | } | |
723 | ||
724 | void free_initmem(void) | |
725 | { | |
bc581770 | 726 | #ifdef CONFIG_HAVE_TCM |
ea208f64 | 727 | extern char __tcm_start, __tcm_end; |
bc581770 | 728 | |
54d52573 | 729 | poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); |
ea208f64 LW |
730 | totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), |
731 | __phys_to_pfn(__pa(&__tcm_end)), | |
bc581770 LW |
732 | "TCM link"); |
733 | #endif | |
734 | ||
54d52573 | 735 | poison_init_mem(__init_begin, __init_end - __init_begin); |
6db015e4 | 736 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
37efe642 RK |
737 | totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), |
738 | __phys_to_pfn(__pa(__init_end)), | |
6db015e4 | 739 | "init"); |
1da177e4 LT |
740 | } |
741 | ||
742 | #ifdef CONFIG_BLK_DEV_INITRD | |
743 | ||
744 | static int keep_initrd; | |
745 | ||
746 | void free_initrd_mem(unsigned long start, unsigned long end) | |
747 | { | |
54d52573 SB |
748 | if (!keep_initrd) { |
749 | poison_init_mem((void *)start, PAGE_ALIGN(end) - start); | |
6db015e4 NP |
750 | totalram_pages += free_area(__phys_to_pfn(__pa(start)), |
751 | __phys_to_pfn(__pa(end)), | |
752 | "initrd"); | |
54d52573 | 753 | } |
1da177e4 LT |
754 | } |
755 | ||
756 | static int __init keepinitrd_setup(char *__unused) | |
757 | { | |
758 | keep_initrd = 1; | |
759 | return 1; | |
760 | } | |
761 | ||
762 | __setup("keepinitrd", keepinitrd_setup); | |
763 | #endif |