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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> | |
16 | #include <linux/nodemask.h> | |
17 | #include <linux/initrd.h> | |
b7cfda9f | 18 | #include <linux/sort.h> |
3835f6cb | 19 | #include <linux/highmem.h> |
1da177e4 LT |
20 | |
21 | #include <asm/mach-types.h> | |
37efe642 | 22 | #include <asm/sections.h> |
1da177e4 | 23 | #include <asm/setup.h> |
74d02fb9 | 24 | #include <asm/sizes.h> |
1da177e4 | 25 | #include <asm/tlb.h> |
db9ef1af | 26 | #include <asm/fixmap.h> |
1da177e4 LT |
27 | |
28 | #include <asm/mach/arch.h> | |
29 | #include <asm/mach/map.h> | |
30 | ||
1b2e2b73 RK |
31 | #include "mm.h" |
32 | ||
012d1f4a RK |
33 | static unsigned long phys_initrd_start __initdata = 0; |
34 | static unsigned long phys_initrd_size __initdata = 0; | |
35 | ||
2b0d8c25 | 36 | static int __init early_initrd(char *p) |
012d1f4a RK |
37 | { |
38 | unsigned long start, size; | |
2b0d8c25 | 39 | char *endp; |
012d1f4a | 40 | |
2b0d8c25 JK |
41 | start = memparse(p, &endp); |
42 | if (*endp == ',') { | |
43 | size = memparse(endp + 1, NULL); | |
012d1f4a RK |
44 | |
45 | phys_initrd_start = start; | |
46 | phys_initrd_size = size; | |
47 | } | |
2b0d8c25 | 48 | return 0; |
012d1f4a | 49 | } |
2b0d8c25 | 50 | early_param("initrd", early_initrd); |
012d1f4a RK |
51 | |
52 | static int __init parse_tag_initrd(const struct tag *tag) | |
53 | { | |
54 | printk(KERN_WARNING "ATAG_INITRD is deprecated; " | |
55 | "please update your bootloader.\n"); | |
56 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); | |
57 | phys_initrd_size = tag->u.initrd.size; | |
58 | return 0; | |
59 | } | |
60 | ||
61 | __tagtable(ATAG_INITRD, parse_tag_initrd); | |
62 | ||
63 | static int __init parse_tag_initrd2(const struct tag *tag) | |
64 | { | |
65 | phys_initrd_start = tag->u.initrd.start; | |
66 | phys_initrd_size = tag->u.initrd.size; | |
67 | return 0; | |
68 | } | |
69 | ||
70 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); | |
1da177e4 LT |
71 | |
72 | /* | |
4b5f32ce NP |
73 | * This keeps memory configuration data used by a couple memory |
74 | * initialization functions, as well as show_mem() for the skipping | |
75 | * of holes in the memory map. It is populated by arm_add_memory(). | |
1da177e4 | 76 | */ |
4b5f32ce | 77 | struct meminfo meminfo; |
5e709827 | 78 | |
1da177e4 LT |
79 | void show_mem(void) |
80 | { | |
81 | int free = 0, total = 0, reserved = 0; | |
5e709827 RL |
82 | int shared = 0, cached = 0, slab = 0, node, i; |
83 | struct meminfo * mi = &meminfo; | |
1da177e4 LT |
84 | |
85 | printk("Mem-info:\n"); | |
86 | show_free_areas(); | |
1da177e4 | 87 | for_each_online_node(node) { |
204ecae4 | 88 | pg_data_t *n = NODE_DATA(node); |
b7a69ac3 | 89 | struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn; |
204ecae4 | 90 | |
5e709827 | 91 | for_each_nodebank (i,mi,node) { |
d2a38ef9 | 92 | struct membank *bank = &mi->bank[i]; |
5e709827 RL |
93 | unsigned int pfn1, pfn2; |
94 | struct page *page, *end; | |
95 | ||
d2a38ef9 RK |
96 | pfn1 = bank_pfn_start(bank); |
97 | pfn2 = bank_pfn_end(bank); | |
5e709827 | 98 | |
204ecae4 RK |
99 | page = map + pfn1; |
100 | end = map + pfn2; | |
5e709827 RL |
101 | |
102 | do { | |
103 | total++; | |
104 | if (PageReserved(page)) | |
105 | reserved++; | |
106 | else if (PageSwapCache(page)) | |
107 | cached++; | |
108 | else if (PageSlab(page)) | |
109 | slab++; | |
110 | else if (!page_count(page)) | |
111 | free++; | |
112 | else | |
113 | shared += page_count(page) - 1; | |
114 | page++; | |
115 | } while (page < end); | |
116 | } | |
1da177e4 LT |
117 | } |
118 | ||
119 | printk("%d pages of RAM\n", total); | |
120 | printk("%d free pages\n", free); | |
121 | printk("%d reserved pages\n", reserved); | |
122 | printk("%d slab pages\n", slab); | |
123 | printk("%d pages shared\n", shared); | |
124 | printk("%d pages swap cached\n", cached); | |
125 | } | |
126 | ||
dde5828f RK |
127 | static void __init find_node_limits(int node, struct meminfo *mi, |
128 | unsigned long *min, unsigned long *max_low, unsigned long *max_high) | |
129 | { | |
130 | int i; | |
131 | ||
132 | *min = -1UL; | |
133 | *max_low = *max_high = 0; | |
134 | ||
135 | for_each_nodebank(i, mi, node) { | |
136 | struct membank *bank = &mi->bank[i]; | |
137 | unsigned long start, end; | |
138 | ||
139 | start = bank_pfn_start(bank); | |
140 | end = bank_pfn_end(bank); | |
141 | ||
142 | if (*min > start) | |
143 | *min = start; | |
144 | if (*max_high < end) | |
145 | *max_high = end; | |
146 | if (bank->highmem) | |
147 | continue; | |
148 | if (*max_low < end) | |
149 | *max_low = end; | |
150 | } | |
151 | } | |
152 | ||
1da177e4 LT |
153 | /* |
154 | * FIXME: We really want to avoid allocating the bootmap bitmap | |
155 | * over the top of the initrd. Hopefully, this is located towards | |
156 | * the start of a bank, so if we allocate the bootmap bitmap at | |
157 | * the end, we won't clash. | |
158 | */ | |
159 | static unsigned int __init | |
160 | find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) | |
161 | { | |
d2a38ef9 | 162 | unsigned int start_pfn, i, bootmap_pfn; |
1da177e4 | 163 | |
37efe642 | 164 | start_pfn = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT; |
1da177e4 LT |
165 | bootmap_pfn = 0; |
166 | ||
d2a38ef9 RK |
167 | for_each_nodebank(i, mi, node) { |
168 | struct membank *bank = &mi->bank[i]; | |
1da177e4 LT |
169 | unsigned int start, end; |
170 | ||
d2a38ef9 RK |
171 | start = bank_pfn_start(bank); |
172 | end = bank_pfn_end(bank); | |
1da177e4 LT |
173 | |
174 | if (end < start_pfn) | |
175 | continue; | |
176 | ||
177 | if (start < start_pfn) | |
178 | start = start_pfn; | |
179 | ||
180 | if (end <= start) | |
181 | continue; | |
182 | ||
183 | if (end - start >= bootmap_pages) { | |
184 | bootmap_pfn = start; | |
185 | break; | |
186 | } | |
187 | } | |
188 | ||
189 | if (bootmap_pfn == 0) | |
190 | BUG(); | |
191 | ||
192 | return bootmap_pfn; | |
193 | } | |
194 | ||
1da177e4 LT |
195 | static int __init check_initrd(struct meminfo *mi) |
196 | { | |
197 | int initrd_node = -2; | |
198 | #ifdef CONFIG_BLK_DEV_INITRD | |
199 | unsigned long end = phys_initrd_start + phys_initrd_size; | |
200 | ||
201 | /* | |
202 | * Make sure that the initrd is within a valid area of | |
203 | * memory. | |
204 | */ | |
205 | if (phys_initrd_size) { | |
206 | unsigned int i; | |
207 | ||
208 | initrd_node = -1; | |
209 | ||
210 | for (i = 0; i < mi->nr_banks; i++) { | |
d2a38ef9 RK |
211 | struct membank *bank = &mi->bank[i]; |
212 | if (bank_phys_start(bank) <= phys_initrd_start && | |
213 | end <= bank_phys_end(bank)) | |
214 | initrd_node = bank->node; | |
1da177e4 LT |
215 | } |
216 | } | |
217 | ||
218 | if (initrd_node == -1) { | |
b962a286 | 219 | printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond " |
1da177e4 | 220 | "physical memory - disabling initrd\n", |
b962a286 | 221 | phys_initrd_start, phys_initrd_size); |
1da177e4 LT |
222 | phys_initrd_start = phys_initrd_size = 0; |
223 | } | |
224 | #endif | |
225 | ||
226 | return initrd_node; | |
227 | } | |
228 | ||
456335e2 RK |
229 | static inline void map_memory_bank(struct membank *bank) |
230 | { | |
d111e8f9 | 231 | #ifdef CONFIG_MMU |
456335e2 RK |
232 | struct map_desc map; |
233 | ||
d2a38ef9 RK |
234 | map.pfn = bank_pfn_start(bank); |
235 | map.virtual = __phys_to_virt(bank_phys_start(bank)); | |
236 | map.length = bank_phys_size(bank); | |
456335e2 RK |
237 | map.type = MT_MEMORY; |
238 | ||
239 | create_mapping(&map); | |
d111e8f9 | 240 | #endif |
456335e2 RK |
241 | } |
242 | ||
dde5828f RK |
243 | static void __init bootmem_init_node(int node, struct meminfo *mi, |
244 | unsigned long start_pfn, unsigned long end_pfn) | |
1da177e4 | 245 | { |
dde5828f | 246 | unsigned long boot_pfn; |
90072059 RK |
247 | unsigned int boot_pages; |
248 | pg_data_t *pgdat; | |
249 | int i; | |
1da177e4 | 250 | |
90072059 | 251 | /* |
dde5828f | 252 | * Map the memory banks for this node. |
90072059 RK |
253 | */ |
254 | for_each_nodebank(i, mi, node) { | |
456335e2 | 255 | struct membank *bank = &mi->bank[i]; |
90072059 | 256 | |
dde5828f RK |
257 | if (!bank->highmem) |
258 | map_memory_bank(bank); | |
90072059 | 259 | } |
1da177e4 | 260 | |
90072059 RK |
261 | /* |
262 | * Allocate the bootmem bitmap page. | |
263 | */ | |
264 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
265 | boot_pfn = find_bootmap_pfn(node, mi, boot_pages); | |
1da177e4 | 266 | |
90072059 RK |
267 | /* |
268 | * Initialise the bootmem allocator for this node, handing the | |
269 | * memory banks over to bootmem. | |
270 | */ | |
271 | node_set_online(node); | |
272 | pgdat = NODE_DATA(node); | |
273 | init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); | |
1da177e4 | 274 | |
d2a38ef9 RK |
275 | for_each_nodebank(i, mi, node) { |
276 | struct membank *bank = &mi->bank[i]; | |
dde5828f RK |
277 | if (!bank->highmem) |
278 | free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank)); | |
d2a38ef9 | 279 | } |
90072059 RK |
280 | |
281 | /* | |
282 | * Reserve the bootmem bitmap for this node. | |
283 | */ | |
284 | reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, | |
72a7fe39 | 285 | boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); |
b7a69ac3 | 286 | } |
b962a286 | 287 | |
b7a69ac3 RK |
288 | static void __init bootmem_reserve_initrd(int node) |
289 | { | |
1da177e4 | 290 | #ifdef CONFIG_BLK_DEV_INITRD |
b7a69ac3 RK |
291 | pg_data_t *pgdat = NODE_DATA(node); |
292 | int res; | |
293 | ||
294 | res = reserve_bootmem_node(pgdat, phys_initrd_start, | |
295 | phys_initrd_size, BOOTMEM_EXCLUSIVE); | |
296 | ||
297 | if (res == 0) { | |
298 | initrd_start = __phys_to_virt(phys_initrd_start); | |
299 | initrd_end = initrd_start + phys_initrd_size; | |
300 | } else { | |
301 | printk(KERN_ERR | |
302 | "INITRD: 0x%08lx+0x%08lx overlaps in-use " | |
303 | "memory region - disabling initrd\n", | |
304 | phys_initrd_start, phys_initrd_size); | |
1da177e4 LT |
305 | } |
306 | #endif | |
b7a69ac3 RK |
307 | } |
308 | ||
309 | static void __init bootmem_free_node(int node, struct meminfo *mi) | |
310 | { | |
311 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
dde5828f | 312 | unsigned long min, max_low, max_high; |
b7a69ac3 RK |
313 | int i; |
314 | ||
dde5828f | 315 | find_node_limits(node, mi, &min, &max_low, &max_high); |
1da177e4 | 316 | |
90072059 RK |
317 | /* |
318 | * initialise the zones within this node. | |
319 | */ | |
320 | memset(zone_size, 0, sizeof(zone_size)); | |
90072059 RK |
321 | |
322 | /* | |
323 | * The size of this node has already been determined. If we need | |
324 | * to do anything fancy with the allocation of this memory to the | |
325 | * zones, now is the time to do it. | |
326 | */ | |
dde5828f RK |
327 | zone_size[0] = max_low - min; |
328 | #ifdef CONFIG_HIGHMEM | |
329 | zone_size[ZONE_HIGHMEM] = max_high - max_low; | |
330 | #endif | |
90072059 RK |
331 | |
332 | /* | |
333 | * For each bank in this node, calculate the size of the holes. | |
334 | * holes = node_size - sum(bank_sizes_in_node) | |
335 | */ | |
dde5828f RK |
336 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
337 | for_each_nodebank(i, mi, node) { | |
338 | int idx = 0; | |
339 | #ifdef CONFIG_HIGHMEM | |
340 | if (mi->bank[i].highmem) | |
341 | idx = ZONE_HIGHMEM; | |
342 | #endif | |
343 | zhole_size[idx] -= bank_pfn_size(&mi->bank[i]); | |
344 | } | |
90072059 RK |
345 | |
346 | /* | |
347 | * Adjust the sizes according to any special requirements for | |
348 | * this machine type. | |
349 | */ | |
350 | arch_adjust_zones(node, zone_size, zhole_size); | |
351 | ||
dde5828f | 352 | free_area_init_node(node, zone_size, min, zhole_size); |
1da177e4 LT |
353 | } |
354 | ||
b7cfda9f RK |
355 | #ifndef CONFIG_SPARSEMEM |
356 | int pfn_valid(unsigned long pfn) | |
357 | { | |
358 | struct meminfo *mi = &meminfo; | |
359 | unsigned int left = 0, right = mi->nr_banks; | |
360 | ||
361 | do { | |
362 | unsigned int mid = (right + left) / 2; | |
363 | struct membank *bank = &mi->bank[mid]; | |
364 | ||
365 | if (pfn < bank_pfn_start(bank)) | |
366 | right = mid; | |
367 | else if (pfn >= bank_pfn_end(bank)) | |
368 | left = mid + 1; | |
369 | else | |
370 | return 1; | |
371 | } while (left < right); | |
372 | return 0; | |
373 | } | |
374 | EXPORT_SYMBOL(pfn_valid); | |
657e12fd RK |
375 | |
376 | static void arm_memory_present(struct meminfo *mi, int node) | |
377 | { | |
378 | } | |
379 | #else | |
380 | static void arm_memory_present(struct meminfo *mi, int node) | |
381 | { | |
382 | int i; | |
383 | for_each_nodebank(i, mi, node) { | |
384 | struct membank *bank = &mi->bank[i]; | |
385 | memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank)); | |
386 | } | |
387 | } | |
b7cfda9f RK |
388 | #endif |
389 | ||
390 | static int __init meminfo_cmp(const void *_a, const void *_b) | |
391 | { | |
392 | const struct membank *a = _a, *b = _b; | |
393 | long cmp = bank_pfn_start(a) - bank_pfn_start(b); | |
394 | return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; | |
395 | } | |
396 | ||
4b5f32ce | 397 | void __init bootmem_init(void) |
1da177e4 | 398 | { |
4b5f32ce | 399 | struct meminfo *mi = &meminfo; |
dde5828f | 400 | unsigned long min, max_low, max_high; |
eca73214 | 401 | int node, initrd_node; |
1da177e4 | 402 | |
b7cfda9f RK |
403 | sort(&mi->bank, mi->nr_banks, sizeof(mi->bank[0]), meminfo_cmp, NULL); |
404 | ||
1da177e4 | 405 | /* |
90072059 | 406 | * Locate which node contains the ramdisk image, if any. |
1da177e4 | 407 | */ |
90072059 | 408 | initrd_node = check_initrd(mi); |
1da177e4 | 409 | |
dde5828f RK |
410 | max_low = max_high = 0; |
411 | ||
90072059 RK |
412 | /* |
413 | * Run through each node initialising the bootmem allocator. | |
414 | */ | |
415 | for_each_node(node) { | |
dde5828f RK |
416 | unsigned long node_low, node_high; |
417 | ||
418 | find_node_limits(node, mi, &min, &node_low, &node_high); | |
419 | ||
420 | if (node_low > max_low) | |
421 | max_low = node_low; | |
422 | if (node_high > max_high) | |
423 | max_high = node_high; | |
424 | ||
425 | /* | |
426 | * If there is no memory in this node, ignore it. | |
427 | * (We can't have nodes which have no lowmem) | |
428 | */ | |
429 | if (node_low == 0) | |
430 | continue; | |
431 | ||
432 | bootmem_init_node(node, mi, min, node_low); | |
1da177e4 | 433 | |
b7a69ac3 RK |
434 | /* |
435 | * Reserve any special node zero regions. | |
436 | */ | |
437 | if (node == 0) | |
438 | reserve_node_zero(NODE_DATA(node)); | |
439 | ||
440 | /* | |
441 | * If the initrd is in this node, reserve its memory. | |
442 | */ | |
443 | if (node == initrd_node) | |
444 | bootmem_reserve_initrd(node); | |
657e12fd RK |
445 | |
446 | /* | |
447 | * Sparsemem tries to allocate bootmem in memory_present(), | |
448 | * so must be done after the fixed reservations | |
449 | */ | |
450 | arm_memory_present(mi, node); | |
90072059 | 451 | } |
1da177e4 | 452 | |
b7a69ac3 RK |
453 | /* |
454 | * sparse_init() needs the bootmem allocator up and running. | |
455 | */ | |
456 | sparse_init(); | |
457 | ||
458 | /* | |
459 | * Now free memory in each node - free_area_init_node needs | |
460 | * the sparse mem_map arrays initialized by sparse_init() | |
461 | * for memmap_init_zone(), otherwise all PFNs are invalid. | |
462 | */ | |
463 | for_each_node(node) | |
464 | bootmem_free_node(node, mi); | |
465 | ||
dde5828f | 466 | high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1; |
1da177e4 | 467 | |
90072059 RK |
468 | /* |
469 | * This doesn't seem to be used by the Linux memory manager any | |
470 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
471 | * also get rid of some of the stuff above as well. | |
472 | * | |
473 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in | |
474 | * the system, not the maximum PFN. | |
475 | */ | |
dde5828f RK |
476 | max_low_pfn = max_low - PHYS_PFN_OFFSET; |
477 | max_pfn = max_high - PHYS_PFN_OFFSET; | |
90072059 | 478 | } |
1da177e4 | 479 | |
6db015e4 | 480 | static inline int free_area(unsigned long pfn, unsigned long end, char *s) |
1da177e4 | 481 | { |
6db015e4 | 482 | unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); |
1da177e4 | 483 | |
6db015e4 NP |
484 | for (; pfn < end; pfn++) { |
485 | struct page *page = pfn_to_page(pfn); | |
1da177e4 | 486 | ClearPageReserved(page); |
7835e98b | 487 | init_page_count(page); |
6db015e4 NP |
488 | __free_page(page); |
489 | pages++; | |
1da177e4 LT |
490 | } |
491 | ||
492 | if (size && s) | |
493 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); | |
6db015e4 NP |
494 | |
495 | return pages; | |
1da177e4 LT |
496 | } |
497 | ||
a013053d RK |
498 | static inline void |
499 | free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) | |
500 | { | |
501 | struct page *start_pg, *end_pg; | |
502 | unsigned long pg, pgend; | |
503 | ||
504 | /* | |
505 | * Convert start_pfn/end_pfn to a struct page pointer. | |
506 | */ | |
3257f43d | 507 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
a013053d RK |
508 | end_pg = pfn_to_page(end_pfn); |
509 | ||
510 | /* | |
511 | * Convert to physical addresses, and | |
512 | * round start upwards and end downwards. | |
513 | */ | |
514 | pg = PAGE_ALIGN(__pa(start_pg)); | |
515 | pgend = __pa(end_pg) & PAGE_MASK; | |
516 | ||
517 | /* | |
518 | * If there are free pages between these, | |
519 | * free the section of the memmap array. | |
520 | */ | |
521 | if (pg < pgend) | |
522 | free_bootmem_node(NODE_DATA(node), pg, pgend - pg); | |
523 | } | |
524 | ||
525 | /* | |
526 | * The mem_map array can get very big. Free the unused area of the memory map. | |
527 | */ | |
528 | static void __init free_unused_memmap_node(int node, struct meminfo *mi) | |
529 | { | |
530 | unsigned long bank_start, prev_bank_end = 0; | |
531 | unsigned int i; | |
532 | ||
533 | /* | |
534 | * [FIXME] This relies on each bank being in address order. This | |
535 | * may not be the case, especially if the user has provided the | |
536 | * information on the command line. | |
537 | */ | |
90072059 | 538 | for_each_nodebank(i, mi, node) { |
d2a38ef9 RK |
539 | struct membank *bank = &mi->bank[i]; |
540 | ||
541 | bank_start = bank_pfn_start(bank); | |
a013053d RK |
542 | if (bank_start < prev_bank_end) { |
543 | printk(KERN_ERR "MEM: unordered memory banks. " | |
544 | "Not freeing memmap.\n"); | |
545 | break; | |
546 | } | |
547 | ||
548 | /* | |
549 | * If we had a previous bank, and there is a space | |
550 | * between the current bank and the previous, free it. | |
551 | */ | |
552 | if (prev_bank_end && prev_bank_end != bank_start) | |
553 | free_memmap(node, prev_bank_end, bank_start); | |
554 | ||
d2a38ef9 | 555 | prev_bank_end = bank_pfn_end(bank); |
a013053d RK |
556 | } |
557 | } | |
558 | ||
1da177e4 LT |
559 | /* |
560 | * mem_init() marks the free areas in the mem_map and tells us how much | |
561 | * memory is free. This is done after various parts of the system have | |
562 | * claimed their memory after the kernel image. | |
563 | */ | |
564 | void __init mem_init(void) | |
565 | { | |
db9ef1af | 566 | unsigned long reserved_pages, free_pages; |
1da177e4 LT |
567 | int i, node; |
568 | ||
1da177e4 | 569 | #ifndef CONFIG_DISCONTIGMEM |
3835f6cb | 570 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
1da177e4 LT |
571 | #endif |
572 | ||
1da177e4 LT |
573 | /* this will put all unused low memory onto the freelists */ |
574 | for_each_online_node(node) { | |
575 | pg_data_t *pgdat = NODE_DATA(node); | |
576 | ||
a013053d RK |
577 | free_unused_memmap_node(node, &meminfo); |
578 | ||
1da177e4 LT |
579 | if (pgdat->node_spanned_pages != 0) |
580 | totalram_pages += free_all_bootmem_node(pgdat); | |
581 | } | |
582 | ||
583 | #ifdef CONFIG_SA1111 | |
584 | /* now that our DMA memory is actually so designated, we can free it */ | |
6db015e4 NP |
585 | totalram_pages += free_area(PHYS_PFN_OFFSET, |
586 | __phys_to_pfn(__pa(swapper_pg_dir)), NULL); | |
1da177e4 LT |
587 | #endif |
588 | ||
3835f6cb NP |
589 | #ifdef CONFIG_HIGHMEM |
590 | /* set highmem page free */ | |
591 | for_each_online_node(node) { | |
592 | for_each_nodebank (i, &meminfo, node) { | |
593 | unsigned long start = bank_pfn_start(&meminfo.bank[i]); | |
594 | unsigned long end = bank_pfn_end(&meminfo.bank[i]); | |
595 | if (start >= max_low_pfn + PHYS_PFN_OFFSET) | |
596 | totalhigh_pages += free_area(start, end, NULL); | |
597 | } | |
598 | } | |
599 | totalram_pages += totalhigh_pages; | |
600 | #endif | |
601 | ||
db9ef1af FB |
602 | reserved_pages = free_pages = 0; |
603 | ||
604 | for_each_online_node(node) { | |
605 | pg_data_t *n = NODE_DATA(node); | |
606 | struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn; | |
607 | ||
608 | for_each_nodebank(i, &meminfo, node) { | |
609 | struct membank *bank = &meminfo.bank[i]; | |
610 | unsigned int pfn1, pfn2; | |
611 | struct page *page, *end; | |
612 | ||
613 | pfn1 = bank_pfn_start(bank); | |
614 | pfn2 = bank_pfn_end(bank); | |
615 | ||
616 | page = map + pfn1; | |
617 | end = map + pfn2; | |
618 | ||
619 | do { | |
620 | if (PageReserved(page)) | |
621 | reserved_pages++; | |
622 | else if (!page_count(page)) | |
623 | free_pages++; | |
624 | page++; | |
625 | } while (page < end); | |
626 | } | |
627 | } | |
628 | ||
1da177e4 LT |
629 | /* |
630 | * Since our memory may not be contiguous, calculate the | |
631 | * real number of pages we have in this system | |
632 | */ | |
633 | printk(KERN_INFO "Memory:"); | |
1da177e4 LT |
634 | num_physpages = 0; |
635 | for (i = 0; i < meminfo.nr_banks; i++) { | |
d2a38ef9 RK |
636 | num_physpages += bank_pfn_size(&meminfo.bank[i]); |
637 | printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); | |
1da177e4 | 638 | } |
1da177e4 | 639 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); |
6db015e4 | 640 | |
db9ef1af FB |
641 | printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", |
642 | nr_free_pages() << (PAGE_SHIFT-10), | |
643 | free_pages << (PAGE_SHIFT-10), | |
644 | reserved_pages << (PAGE_SHIFT-10), | |
4b529401 | 645 | totalhigh_pages << (PAGE_SHIFT-10)); |
1da177e4 | 646 | |
db9ef1af FB |
647 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
648 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
649 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
650 | ||
651 | printk(KERN_NOTICE "Virtual kernel memory layout:\n" | |
652 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
653 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
a7bd08c8 FB |
654 | #ifdef CONFIG_MMU |
655 | " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
656 | #endif | |
db9ef1af FB |
657 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
658 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
659 | #ifdef CONFIG_HIGHMEM | |
660 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
661 | #endif | |
662 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
663 | " .init : 0x%p" " - 0x%p" " (%4d kB)\n" | |
664 | " .text : 0x%p" " - 0x%p" " (%4d kB)\n" | |
665 | " .data : 0x%p" " - 0x%p" " (%4d kB)\n", | |
666 | ||
667 | MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + | |
668 | (PAGE_SIZE)), | |
669 | MLK(FIXADDR_START, FIXADDR_TOP), | |
a7bd08c8 FB |
670 | #ifdef CONFIG_MMU |
671 | MLM(CONSISTENT_BASE, CONSISTENT_END), | |
672 | #endif | |
c931b4f6 | 673 | MLM(VMALLOC_START, VMALLOC_END), |
db9ef1af FB |
674 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
675 | #ifdef CONFIG_HIGHMEM | |
676 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * | |
677 | (PAGE_SIZE)), | |
678 | #endif | |
679 | MLM(MODULES_VADDR, MODULES_END), | |
680 | ||
681 | MLK_ROUNDUP(__init_begin, __init_end), | |
682 | MLK_ROUNDUP(_text, _etext), | |
683 | MLK_ROUNDUP(_data, _edata)); | |
684 | ||
685 | #undef MLK | |
686 | #undef MLM | |
687 | #undef MLK_ROUNDUP | |
688 | ||
a1839272 FB |
689 | /* |
690 | * Check boundaries twice: Some fundamental inconsistencies can | |
691 | * be detected at build time already. | |
692 | */ | |
693 | #ifdef CONFIG_MMU | |
694 | BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); | |
695 | BUG_ON(VMALLOC_END > CONSISTENT_BASE); | |
696 | ||
697 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); | |
698 | BUG_ON(TASK_SIZE > MODULES_VADDR); | |
699 | #endif | |
700 | ||
701 | #ifdef CONFIG_HIGHMEM | |
702 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
703 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
704 | #endif | |
705 | ||
1da177e4 LT |
706 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { |
707 | extern int sysctl_overcommit_memory; | |
708 | /* | |
709 | * On a machine this small we won't get | |
710 | * anywhere without overcommit, so turn | |
711 | * it on by default. | |
712 | */ | |
713 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
714 | } | |
715 | } | |
716 | ||
717 | void free_initmem(void) | |
718 | { | |
bc581770 LW |
719 | #ifdef CONFIG_HAVE_TCM |
720 | extern char *__tcm_start, *__tcm_end; | |
721 | ||
722 | totalram_pages += free_area(__phys_to_pfn(__pa(__tcm_start)), | |
723 | __phys_to_pfn(__pa(__tcm_end)), | |
724 | "TCM link"); | |
725 | #endif | |
726 | ||
6db015e4 | 727 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
37efe642 RK |
728 | totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), |
729 | __phys_to_pfn(__pa(__init_end)), | |
6db015e4 | 730 | "init"); |
1da177e4 LT |
731 | } |
732 | ||
733 | #ifdef CONFIG_BLK_DEV_INITRD | |
734 | ||
735 | static int keep_initrd; | |
736 | ||
737 | void free_initrd_mem(unsigned long start, unsigned long end) | |
738 | { | |
739 | if (!keep_initrd) | |
6db015e4 NP |
740 | totalram_pages += free_area(__phys_to_pfn(__pa(start)), |
741 | __phys_to_pfn(__pa(end)), | |
742 | "initrd"); | |
1da177e4 LT |
743 | } |
744 | ||
745 | static int __init keepinitrd_setup(char *__unused) | |
746 | { | |
747 | keep_initrd = 1; | |
748 | return 1; | |
749 | } | |
750 | ||
751 | __setup("keepinitrd", keepinitrd_setup); | |
752 | #endif |