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 LT |
25 | #include <asm/tlb.h> |
26 | ||
27 | #include <asm/mach/arch.h> | |
28 | #include <asm/mach/map.h> | |
29 | ||
1b2e2b73 RK |
30 | #include "mm.h" |
31 | ||
012d1f4a RK |
32 | static unsigned long phys_initrd_start __initdata = 0; |
33 | static unsigned long phys_initrd_size __initdata = 0; | |
34 | ||
2b0d8c25 | 35 | static int __init early_initrd(char *p) |
012d1f4a RK |
36 | { |
37 | unsigned long start, size; | |
2b0d8c25 | 38 | char *endp; |
012d1f4a | 39 | |
2b0d8c25 JK |
40 | start = memparse(p, &endp); |
41 | if (*endp == ',') { | |
42 | size = memparse(endp + 1, NULL); | |
012d1f4a RK |
43 | |
44 | phys_initrd_start = start; | |
45 | phys_initrd_size = size; | |
46 | } | |
2b0d8c25 | 47 | return 0; |
012d1f4a | 48 | } |
2b0d8c25 | 49 | early_param("initrd", early_initrd); |
012d1f4a RK |
50 | |
51 | static int __init parse_tag_initrd(const struct tag *tag) | |
52 | { | |
53 | printk(KERN_WARNING "ATAG_INITRD is deprecated; " | |
54 | "please update your bootloader.\n"); | |
55 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); | |
56 | phys_initrd_size = tag->u.initrd.size; | |
57 | return 0; | |
58 | } | |
59 | ||
60 | __tagtable(ATAG_INITRD, parse_tag_initrd); | |
61 | ||
62 | static int __init parse_tag_initrd2(const struct tag *tag) | |
63 | { | |
64 | phys_initrd_start = tag->u.initrd.start; | |
65 | phys_initrd_size = tag->u.initrd.size; | |
66 | return 0; | |
67 | } | |
68 | ||
69 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); | |
1da177e4 LT |
70 | |
71 | /* | |
4b5f32ce NP |
72 | * This keeps memory configuration data used by a couple memory |
73 | * initialization functions, as well as show_mem() for the skipping | |
74 | * of holes in the memory map. It is populated by arm_add_memory(). | |
1da177e4 | 75 | */ |
4b5f32ce | 76 | struct meminfo meminfo; |
5e709827 | 77 | |
1da177e4 LT |
78 | void show_mem(void) |
79 | { | |
80 | int free = 0, total = 0, reserved = 0; | |
5e709827 RL |
81 | int shared = 0, cached = 0, slab = 0, node, i; |
82 | struct meminfo * mi = &meminfo; | |
1da177e4 LT |
83 | |
84 | printk("Mem-info:\n"); | |
85 | show_free_areas(); | |
1da177e4 | 86 | for_each_online_node(node) { |
204ecae4 | 87 | pg_data_t *n = NODE_DATA(node); |
b7a69ac3 | 88 | struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn; |
204ecae4 | 89 | |
5e709827 | 90 | for_each_nodebank (i,mi,node) { |
d2a38ef9 | 91 | struct membank *bank = &mi->bank[i]; |
5e709827 RL |
92 | unsigned int pfn1, pfn2; |
93 | struct page *page, *end; | |
94 | ||
d2a38ef9 RK |
95 | pfn1 = bank_pfn_start(bank); |
96 | pfn2 = bank_pfn_end(bank); | |
5e709827 | 97 | |
204ecae4 RK |
98 | page = map + pfn1; |
99 | end = map + pfn2; | |
5e709827 RL |
100 | |
101 | do { | |
102 | total++; | |
103 | if (PageReserved(page)) | |
104 | reserved++; | |
105 | else if (PageSwapCache(page)) | |
106 | cached++; | |
107 | else if (PageSlab(page)) | |
108 | slab++; | |
109 | else if (!page_count(page)) | |
110 | free++; | |
111 | else | |
112 | shared += page_count(page) - 1; | |
113 | page++; | |
114 | } while (page < end); | |
115 | } | |
1da177e4 LT |
116 | } |
117 | ||
118 | printk("%d pages of RAM\n", total); | |
119 | printk("%d free pages\n", free); | |
120 | printk("%d reserved pages\n", reserved); | |
121 | printk("%d slab pages\n", slab); | |
122 | printk("%d pages shared\n", shared); | |
123 | printk("%d pages swap cached\n", cached); | |
124 | } | |
125 | ||
dde5828f RK |
126 | static void __init find_node_limits(int node, struct meminfo *mi, |
127 | unsigned long *min, unsigned long *max_low, unsigned long *max_high) | |
128 | { | |
129 | int i; | |
130 | ||
131 | *min = -1UL; | |
132 | *max_low = *max_high = 0; | |
133 | ||
134 | for_each_nodebank(i, mi, node) { | |
135 | struct membank *bank = &mi->bank[i]; | |
136 | unsigned long start, end; | |
137 | ||
138 | start = bank_pfn_start(bank); | |
139 | end = bank_pfn_end(bank); | |
140 | ||
141 | if (*min > start) | |
142 | *min = start; | |
143 | if (*max_high < end) | |
144 | *max_high = end; | |
145 | if (bank->highmem) | |
146 | continue; | |
147 | if (*max_low < end) | |
148 | *max_low = end; | |
149 | } | |
150 | } | |
151 | ||
1da177e4 LT |
152 | /* |
153 | * FIXME: We really want to avoid allocating the bootmap bitmap | |
154 | * over the top of the initrd. Hopefully, this is located towards | |
155 | * the start of a bank, so if we allocate the bootmap bitmap at | |
156 | * the end, we won't clash. | |
157 | */ | |
158 | static unsigned int __init | |
159 | find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) | |
160 | { | |
d2a38ef9 | 161 | unsigned int start_pfn, i, bootmap_pfn; |
1da177e4 | 162 | |
37efe642 | 163 | start_pfn = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT; |
1da177e4 LT |
164 | bootmap_pfn = 0; |
165 | ||
d2a38ef9 RK |
166 | for_each_nodebank(i, mi, node) { |
167 | struct membank *bank = &mi->bank[i]; | |
1da177e4 LT |
168 | unsigned int start, end; |
169 | ||
d2a38ef9 RK |
170 | start = bank_pfn_start(bank); |
171 | end = bank_pfn_end(bank); | |
1da177e4 LT |
172 | |
173 | if (end < start_pfn) | |
174 | continue; | |
175 | ||
176 | if (start < start_pfn) | |
177 | start = start_pfn; | |
178 | ||
179 | if (end <= start) | |
180 | continue; | |
181 | ||
182 | if (end - start >= bootmap_pages) { | |
183 | bootmap_pfn = start; | |
184 | break; | |
185 | } | |
186 | } | |
187 | ||
188 | if (bootmap_pfn == 0) | |
189 | BUG(); | |
190 | ||
191 | return bootmap_pfn; | |
192 | } | |
193 | ||
1da177e4 LT |
194 | static int __init check_initrd(struct meminfo *mi) |
195 | { | |
196 | int initrd_node = -2; | |
197 | #ifdef CONFIG_BLK_DEV_INITRD | |
198 | unsigned long end = phys_initrd_start + phys_initrd_size; | |
199 | ||
200 | /* | |
201 | * Make sure that the initrd is within a valid area of | |
202 | * memory. | |
203 | */ | |
204 | if (phys_initrd_size) { | |
205 | unsigned int i; | |
206 | ||
207 | initrd_node = -1; | |
208 | ||
209 | for (i = 0; i < mi->nr_banks; i++) { | |
d2a38ef9 RK |
210 | struct membank *bank = &mi->bank[i]; |
211 | if (bank_phys_start(bank) <= phys_initrd_start && | |
212 | end <= bank_phys_end(bank)) | |
213 | initrd_node = bank->node; | |
1da177e4 LT |
214 | } |
215 | } | |
216 | ||
217 | if (initrd_node == -1) { | |
b962a286 | 218 | printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond " |
1da177e4 | 219 | "physical memory - disabling initrd\n", |
b962a286 | 220 | phys_initrd_start, phys_initrd_size); |
1da177e4 LT |
221 | phys_initrd_start = phys_initrd_size = 0; |
222 | } | |
223 | #endif | |
224 | ||
225 | return initrd_node; | |
226 | } | |
227 | ||
456335e2 RK |
228 | static inline void map_memory_bank(struct membank *bank) |
229 | { | |
d111e8f9 | 230 | #ifdef CONFIG_MMU |
456335e2 RK |
231 | struct map_desc map; |
232 | ||
d2a38ef9 RK |
233 | map.pfn = bank_pfn_start(bank); |
234 | map.virtual = __phys_to_virt(bank_phys_start(bank)); | |
235 | map.length = bank_phys_size(bank); | |
456335e2 RK |
236 | map.type = MT_MEMORY; |
237 | ||
238 | create_mapping(&map); | |
d111e8f9 | 239 | #endif |
456335e2 RK |
240 | } |
241 | ||
dde5828f RK |
242 | static void __init bootmem_init_node(int node, struct meminfo *mi, |
243 | unsigned long start_pfn, unsigned long end_pfn) | |
1da177e4 | 244 | { |
dde5828f | 245 | unsigned long boot_pfn; |
90072059 RK |
246 | unsigned int boot_pages; |
247 | pg_data_t *pgdat; | |
248 | int i; | |
1da177e4 | 249 | |
90072059 | 250 | /* |
dde5828f | 251 | * Map the memory banks for this node. |
90072059 RK |
252 | */ |
253 | for_each_nodebank(i, mi, node) { | |
456335e2 | 254 | struct membank *bank = &mi->bank[i]; |
90072059 | 255 | |
dde5828f RK |
256 | if (!bank->highmem) |
257 | map_memory_bank(bank); | |
90072059 | 258 | } |
1da177e4 | 259 | |
90072059 RK |
260 | /* |
261 | * Allocate the bootmem bitmap page. | |
262 | */ | |
263 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
264 | boot_pfn = find_bootmap_pfn(node, mi, boot_pages); | |
1da177e4 | 265 | |
90072059 RK |
266 | /* |
267 | * Initialise the bootmem allocator for this node, handing the | |
268 | * memory banks over to bootmem. | |
269 | */ | |
270 | node_set_online(node); | |
271 | pgdat = NODE_DATA(node); | |
272 | init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); | |
1da177e4 | 273 | |
d2a38ef9 RK |
274 | for_each_nodebank(i, mi, node) { |
275 | struct membank *bank = &mi->bank[i]; | |
dde5828f RK |
276 | if (!bank->highmem) |
277 | free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank)); | |
d2a38ef9 | 278 | } |
90072059 RK |
279 | |
280 | /* | |
281 | * Reserve the bootmem bitmap for this node. | |
282 | */ | |
283 | reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, | |
72a7fe39 | 284 | boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); |
b7a69ac3 | 285 | } |
b962a286 | 286 | |
b7a69ac3 RK |
287 | static void __init bootmem_reserve_initrd(int node) |
288 | { | |
1da177e4 | 289 | #ifdef CONFIG_BLK_DEV_INITRD |
b7a69ac3 RK |
290 | pg_data_t *pgdat = NODE_DATA(node); |
291 | int res; | |
292 | ||
293 | res = reserve_bootmem_node(pgdat, phys_initrd_start, | |
294 | phys_initrd_size, BOOTMEM_EXCLUSIVE); | |
295 | ||
296 | if (res == 0) { | |
297 | initrd_start = __phys_to_virt(phys_initrd_start); | |
298 | initrd_end = initrd_start + phys_initrd_size; | |
299 | } else { | |
300 | printk(KERN_ERR | |
301 | "INITRD: 0x%08lx+0x%08lx overlaps in-use " | |
302 | "memory region - disabling initrd\n", | |
303 | phys_initrd_start, phys_initrd_size); | |
1da177e4 LT |
304 | } |
305 | #endif | |
b7a69ac3 RK |
306 | } |
307 | ||
308 | static void __init bootmem_free_node(int node, struct meminfo *mi) | |
309 | { | |
310 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
dde5828f | 311 | unsigned long min, max_low, max_high; |
b7a69ac3 RK |
312 | int i; |
313 | ||
dde5828f | 314 | find_node_limits(node, mi, &min, &max_low, &max_high); |
1da177e4 | 315 | |
90072059 RK |
316 | /* |
317 | * initialise the zones within this node. | |
318 | */ | |
319 | memset(zone_size, 0, sizeof(zone_size)); | |
90072059 RK |
320 | |
321 | /* | |
322 | * The size of this node has already been determined. If we need | |
323 | * to do anything fancy with the allocation of this memory to the | |
324 | * zones, now is the time to do it. | |
325 | */ | |
dde5828f RK |
326 | zone_size[0] = max_low - min; |
327 | #ifdef CONFIG_HIGHMEM | |
328 | zone_size[ZONE_HIGHMEM] = max_high - max_low; | |
329 | #endif | |
90072059 RK |
330 | |
331 | /* | |
332 | * For each bank in this node, calculate the size of the holes. | |
333 | * holes = node_size - sum(bank_sizes_in_node) | |
334 | */ | |
dde5828f RK |
335 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
336 | for_each_nodebank(i, mi, node) { | |
337 | int idx = 0; | |
338 | #ifdef CONFIG_HIGHMEM | |
339 | if (mi->bank[i].highmem) | |
340 | idx = ZONE_HIGHMEM; | |
341 | #endif | |
342 | zhole_size[idx] -= bank_pfn_size(&mi->bank[i]); | |
343 | } | |
90072059 RK |
344 | |
345 | /* | |
346 | * Adjust the sizes according to any special requirements for | |
347 | * this machine type. | |
348 | */ | |
349 | arch_adjust_zones(node, zone_size, zhole_size); | |
350 | ||
dde5828f | 351 | free_area_init_node(node, zone_size, min, zhole_size); |
1da177e4 LT |
352 | } |
353 | ||
b7cfda9f RK |
354 | #ifndef CONFIG_SPARSEMEM |
355 | int pfn_valid(unsigned long pfn) | |
356 | { | |
357 | struct meminfo *mi = &meminfo; | |
358 | unsigned int left = 0, right = mi->nr_banks; | |
359 | ||
360 | do { | |
361 | unsigned int mid = (right + left) / 2; | |
362 | struct membank *bank = &mi->bank[mid]; | |
363 | ||
364 | if (pfn < bank_pfn_start(bank)) | |
365 | right = mid; | |
366 | else if (pfn >= bank_pfn_end(bank)) | |
367 | left = mid + 1; | |
368 | else | |
369 | return 1; | |
370 | } while (left < right); | |
371 | return 0; | |
372 | } | |
373 | EXPORT_SYMBOL(pfn_valid); | |
657e12fd RK |
374 | |
375 | static void arm_memory_present(struct meminfo *mi, int node) | |
376 | { | |
377 | } | |
378 | #else | |
379 | static void arm_memory_present(struct meminfo *mi, int node) | |
380 | { | |
381 | int i; | |
382 | for_each_nodebank(i, mi, node) { | |
383 | struct membank *bank = &mi->bank[i]; | |
384 | memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank)); | |
385 | } | |
386 | } | |
b7cfda9f RK |
387 | #endif |
388 | ||
389 | static int __init meminfo_cmp(const void *_a, const void *_b) | |
390 | { | |
391 | const struct membank *a = _a, *b = _b; | |
392 | long cmp = bank_pfn_start(a) - bank_pfn_start(b); | |
393 | return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; | |
394 | } | |
395 | ||
4b5f32ce | 396 | void __init bootmem_init(void) |
1da177e4 | 397 | { |
4b5f32ce | 398 | struct meminfo *mi = &meminfo; |
dde5828f | 399 | unsigned long min, max_low, max_high; |
eca73214 | 400 | int node, initrd_node; |
1da177e4 | 401 | |
b7cfda9f RK |
402 | sort(&mi->bank, mi->nr_banks, sizeof(mi->bank[0]), meminfo_cmp, NULL); |
403 | ||
1da177e4 | 404 | /* |
90072059 | 405 | * Locate which node contains the ramdisk image, if any. |
1da177e4 | 406 | */ |
90072059 | 407 | initrd_node = check_initrd(mi); |
1da177e4 | 408 | |
dde5828f RK |
409 | max_low = max_high = 0; |
410 | ||
90072059 RK |
411 | /* |
412 | * Run through each node initialising the bootmem allocator. | |
413 | */ | |
414 | for_each_node(node) { | |
dde5828f RK |
415 | unsigned long node_low, node_high; |
416 | ||
417 | find_node_limits(node, mi, &min, &node_low, &node_high); | |
418 | ||
419 | if (node_low > max_low) | |
420 | max_low = node_low; | |
421 | if (node_high > max_high) | |
422 | max_high = node_high; | |
423 | ||
424 | /* | |
425 | * If there is no memory in this node, ignore it. | |
426 | * (We can't have nodes which have no lowmem) | |
427 | */ | |
428 | if (node_low == 0) | |
429 | continue; | |
430 | ||
431 | bootmem_init_node(node, mi, min, node_low); | |
1da177e4 | 432 | |
b7a69ac3 RK |
433 | /* |
434 | * Reserve any special node zero regions. | |
435 | */ | |
436 | if (node == 0) | |
437 | reserve_node_zero(NODE_DATA(node)); | |
438 | ||
439 | /* | |
440 | * If the initrd is in this node, reserve its memory. | |
441 | */ | |
442 | if (node == initrd_node) | |
443 | bootmem_reserve_initrd(node); | |
657e12fd RK |
444 | |
445 | /* | |
446 | * Sparsemem tries to allocate bootmem in memory_present(), | |
447 | * so must be done after the fixed reservations | |
448 | */ | |
449 | arm_memory_present(mi, node); | |
90072059 | 450 | } |
1da177e4 | 451 | |
b7a69ac3 RK |
452 | /* |
453 | * sparse_init() needs the bootmem allocator up and running. | |
454 | */ | |
455 | sparse_init(); | |
456 | ||
457 | /* | |
458 | * Now free memory in each node - free_area_init_node needs | |
459 | * the sparse mem_map arrays initialized by sparse_init() | |
460 | * for memmap_init_zone(), otherwise all PFNs are invalid. | |
461 | */ | |
462 | for_each_node(node) | |
463 | bootmem_free_node(node, mi); | |
464 | ||
dde5828f | 465 | high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1; |
1da177e4 | 466 | |
90072059 RK |
467 | /* |
468 | * This doesn't seem to be used by the Linux memory manager any | |
469 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
470 | * also get rid of some of the stuff above as well. | |
471 | * | |
472 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in | |
473 | * the system, not the maximum PFN. | |
474 | */ | |
dde5828f RK |
475 | max_low_pfn = max_low - PHYS_PFN_OFFSET; |
476 | max_pfn = max_high - PHYS_PFN_OFFSET; | |
90072059 | 477 | } |
1da177e4 | 478 | |
6db015e4 | 479 | static inline int free_area(unsigned long pfn, unsigned long end, char *s) |
1da177e4 | 480 | { |
6db015e4 | 481 | unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); |
1da177e4 | 482 | |
6db015e4 NP |
483 | for (; pfn < end; pfn++) { |
484 | struct page *page = pfn_to_page(pfn); | |
1da177e4 | 485 | ClearPageReserved(page); |
7835e98b | 486 | init_page_count(page); |
6db015e4 NP |
487 | __free_page(page); |
488 | pages++; | |
1da177e4 LT |
489 | } |
490 | ||
491 | if (size && s) | |
492 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); | |
6db015e4 NP |
493 | |
494 | return pages; | |
1da177e4 LT |
495 | } |
496 | ||
a013053d RK |
497 | static inline void |
498 | free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) | |
499 | { | |
500 | struct page *start_pg, *end_pg; | |
501 | unsigned long pg, pgend; | |
502 | ||
503 | /* | |
504 | * Convert start_pfn/end_pfn to a struct page pointer. | |
505 | */ | |
3257f43d | 506 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
a013053d RK |
507 | end_pg = pfn_to_page(end_pfn); |
508 | ||
509 | /* | |
510 | * Convert to physical addresses, and | |
511 | * round start upwards and end downwards. | |
512 | */ | |
513 | pg = PAGE_ALIGN(__pa(start_pg)); | |
514 | pgend = __pa(end_pg) & PAGE_MASK; | |
515 | ||
516 | /* | |
517 | * If there are free pages between these, | |
518 | * free the section of the memmap array. | |
519 | */ | |
520 | if (pg < pgend) | |
521 | free_bootmem_node(NODE_DATA(node), pg, pgend - pg); | |
522 | } | |
523 | ||
524 | /* | |
525 | * The mem_map array can get very big. Free the unused area of the memory map. | |
526 | */ | |
527 | static void __init free_unused_memmap_node(int node, struct meminfo *mi) | |
528 | { | |
529 | unsigned long bank_start, prev_bank_end = 0; | |
530 | unsigned int i; | |
531 | ||
532 | /* | |
533 | * [FIXME] This relies on each bank being in address order. This | |
534 | * may not be the case, especially if the user has provided the | |
535 | * information on the command line. | |
536 | */ | |
90072059 | 537 | for_each_nodebank(i, mi, node) { |
d2a38ef9 RK |
538 | struct membank *bank = &mi->bank[i]; |
539 | ||
540 | bank_start = bank_pfn_start(bank); | |
a013053d RK |
541 | if (bank_start < prev_bank_end) { |
542 | printk(KERN_ERR "MEM: unordered memory banks. " | |
543 | "Not freeing memmap.\n"); | |
544 | break; | |
545 | } | |
546 | ||
547 | /* | |
548 | * If we had a previous bank, and there is a space | |
549 | * between the current bank and the previous, free it. | |
550 | */ | |
551 | if (prev_bank_end && prev_bank_end != bank_start) | |
552 | free_memmap(node, prev_bank_end, bank_start); | |
553 | ||
d2a38ef9 | 554 | prev_bank_end = bank_pfn_end(bank); |
a013053d RK |
555 | } |
556 | } | |
557 | ||
1da177e4 LT |
558 | /* |
559 | * mem_init() marks the free areas in the mem_map and tells us how much | |
560 | * memory is free. This is done after various parts of the system have | |
561 | * claimed their memory after the kernel image. | |
562 | */ | |
563 | void __init mem_init(void) | |
564 | { | |
6db015e4 | 565 | unsigned int codesize, datasize, initsize; |
1da177e4 LT |
566 | int i, node; |
567 | ||
1da177e4 | 568 | #ifndef CONFIG_DISCONTIGMEM |
3835f6cb | 569 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
1da177e4 LT |
570 | #endif |
571 | ||
1da177e4 LT |
572 | /* this will put all unused low memory onto the freelists */ |
573 | for_each_online_node(node) { | |
574 | pg_data_t *pgdat = NODE_DATA(node); | |
575 | ||
a013053d RK |
576 | free_unused_memmap_node(node, &meminfo); |
577 | ||
1da177e4 LT |
578 | if (pgdat->node_spanned_pages != 0) |
579 | totalram_pages += free_all_bootmem_node(pgdat); | |
580 | } | |
581 | ||
582 | #ifdef CONFIG_SA1111 | |
583 | /* now that our DMA memory is actually so designated, we can free it */ | |
6db015e4 NP |
584 | totalram_pages += free_area(PHYS_PFN_OFFSET, |
585 | __phys_to_pfn(__pa(swapper_pg_dir)), NULL); | |
1da177e4 LT |
586 | #endif |
587 | ||
3835f6cb NP |
588 | #ifdef CONFIG_HIGHMEM |
589 | /* set highmem page free */ | |
590 | for_each_online_node(node) { | |
591 | for_each_nodebank (i, &meminfo, node) { | |
592 | unsigned long start = bank_pfn_start(&meminfo.bank[i]); | |
593 | unsigned long end = bank_pfn_end(&meminfo.bank[i]); | |
594 | if (start >= max_low_pfn + PHYS_PFN_OFFSET) | |
595 | totalhigh_pages += free_area(start, end, NULL); | |
596 | } | |
597 | } | |
598 | totalram_pages += totalhigh_pages; | |
599 | #endif | |
600 | ||
1da177e4 LT |
601 | /* |
602 | * Since our memory may not be contiguous, calculate the | |
603 | * real number of pages we have in this system | |
604 | */ | |
605 | printk(KERN_INFO "Memory:"); | |
1da177e4 LT |
606 | num_physpages = 0; |
607 | for (i = 0; i < meminfo.nr_banks; i++) { | |
d2a38ef9 RK |
608 | num_physpages += bank_pfn_size(&meminfo.bank[i]); |
609 | printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); | |
1da177e4 | 610 | } |
1da177e4 | 611 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); |
6db015e4 | 612 | |
37efe642 RK |
613 | codesize = _etext - _text; |
614 | datasize = _end - _data; | |
615 | initsize = __init_end - __init_begin; | |
6db015e4 | 616 | |
1da177e4 | 617 | printk(KERN_NOTICE "Memory: %luKB available (%dK code, " |
3835f6cb | 618 | "%dK data, %dK init, %luK highmem)\n", |
cc013a88 GU |
619 | nr_free_pages() << (PAGE_SHIFT-10), codesize >> 10, |
620 | datasize >> 10, initsize >> 10, | |
4b529401 | 621 | totalhigh_pages << (PAGE_SHIFT-10)); |
1da177e4 LT |
622 | |
623 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { | |
624 | extern int sysctl_overcommit_memory; | |
625 | /* | |
626 | * On a machine this small we won't get | |
627 | * anywhere without overcommit, so turn | |
628 | * it on by default. | |
629 | */ | |
630 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
631 | } | |
632 | } | |
633 | ||
634 | void free_initmem(void) | |
635 | { | |
bc581770 LW |
636 | #ifdef CONFIG_HAVE_TCM |
637 | extern char *__tcm_start, *__tcm_end; | |
638 | ||
639 | totalram_pages += free_area(__phys_to_pfn(__pa(__tcm_start)), | |
640 | __phys_to_pfn(__pa(__tcm_end)), | |
641 | "TCM link"); | |
642 | #endif | |
643 | ||
6db015e4 | 644 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
37efe642 RK |
645 | totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), |
646 | __phys_to_pfn(__pa(__init_end)), | |
6db015e4 | 647 | "init"); |
1da177e4 LT |
648 | } |
649 | ||
650 | #ifdef CONFIG_BLK_DEV_INITRD | |
651 | ||
652 | static int keep_initrd; | |
653 | ||
654 | void free_initrd_mem(unsigned long start, unsigned long end) | |
655 | { | |
656 | if (!keep_initrd) | |
6db015e4 NP |
657 | totalram_pages += free_area(__phys_to_pfn(__pa(start)), |
658 | __phys_to_pfn(__pa(end)), | |
659 | "initrd"); | |
1da177e4 LT |
660 | } |
661 | ||
662 | static int __init keepinitrd_setup(char *__unused) | |
663 | { | |
664 | keep_initrd = 1; | |
665 | return 1; | |
666 | } | |
667 | ||
668 | __setup("keepinitrd", keepinitrd_setup); | |
669 | #endif |