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> |
5a0e3ad6 | 20 | #include <linux/gfp.h> |
1da177e4 LT |
21 | |
22 | #include <asm/mach-types.h> | |
37efe642 | 23 | #include <asm/sections.h> |
1da177e4 | 24 | #include <asm/setup.h> |
74d02fb9 | 25 | #include <asm/sizes.h> |
1da177e4 | 26 | #include <asm/tlb.h> |
db9ef1af | 27 | #include <asm/fixmap.h> |
1da177e4 LT |
28 | |
29 | #include <asm/mach/arch.h> | |
30 | #include <asm/mach/map.h> | |
31 | ||
1b2e2b73 RK |
32 | #include "mm.h" |
33 | ||
012d1f4a RK |
34 | static unsigned long phys_initrd_start __initdata = 0; |
35 | static unsigned long phys_initrd_size __initdata = 0; | |
36 | ||
2b0d8c25 | 37 | static int __init early_initrd(char *p) |
012d1f4a RK |
38 | { |
39 | unsigned long start, size; | |
2b0d8c25 | 40 | char *endp; |
012d1f4a | 41 | |
2b0d8c25 JK |
42 | start = memparse(p, &endp); |
43 | if (*endp == ',') { | |
44 | size = memparse(endp + 1, NULL); | |
012d1f4a RK |
45 | |
46 | phys_initrd_start = start; | |
47 | phys_initrd_size = size; | |
48 | } | |
2b0d8c25 | 49 | return 0; |
012d1f4a | 50 | } |
2b0d8c25 | 51 | early_param("initrd", early_initrd); |
012d1f4a RK |
52 | |
53 | static int __init parse_tag_initrd(const struct tag *tag) | |
54 | { | |
55 | printk(KERN_WARNING "ATAG_INITRD is deprecated; " | |
56 | "please update your bootloader.\n"); | |
57 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); | |
58 | phys_initrd_size = tag->u.initrd.size; | |
59 | return 0; | |
60 | } | |
61 | ||
62 | __tagtable(ATAG_INITRD, parse_tag_initrd); | |
63 | ||
64 | static int __init parse_tag_initrd2(const struct tag *tag) | |
65 | { | |
66 | phys_initrd_start = tag->u.initrd.start; | |
67 | phys_initrd_size = tag->u.initrd.size; | |
68 | return 0; | |
69 | } | |
70 | ||
71 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); | |
1da177e4 LT |
72 | |
73 | /* | |
4b5f32ce NP |
74 | * This keeps memory configuration data used by a couple memory |
75 | * initialization functions, as well as show_mem() for the skipping | |
76 | * of holes in the memory map. It is populated by arm_add_memory(). | |
1da177e4 | 77 | */ |
4b5f32ce | 78 | struct meminfo meminfo; |
5e709827 | 79 | |
1da177e4 LT |
80 | void show_mem(void) |
81 | { | |
82 | int free = 0, total = 0, reserved = 0; | |
5e709827 RL |
83 | int shared = 0, cached = 0, slab = 0, node, i; |
84 | struct meminfo * mi = &meminfo; | |
1da177e4 LT |
85 | |
86 | printk("Mem-info:\n"); | |
87 | show_free_areas(); | |
1da177e4 | 88 | for_each_online_node(node) { |
204ecae4 | 89 | pg_data_t *n = NODE_DATA(node); |
b7a69ac3 | 90 | struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn; |
204ecae4 | 91 | |
5e709827 | 92 | for_each_nodebank (i,mi,node) { |
d2a38ef9 | 93 | struct membank *bank = &mi->bank[i]; |
5e709827 RL |
94 | unsigned int pfn1, pfn2; |
95 | struct page *page, *end; | |
96 | ||
d2a38ef9 RK |
97 | pfn1 = bank_pfn_start(bank); |
98 | pfn2 = bank_pfn_end(bank); | |
5e709827 | 99 | |
204ecae4 RK |
100 | page = map + pfn1; |
101 | end = map + pfn2; | |
5e709827 RL |
102 | |
103 | do { | |
104 | total++; | |
105 | if (PageReserved(page)) | |
106 | reserved++; | |
107 | else if (PageSwapCache(page)) | |
108 | cached++; | |
109 | else if (PageSlab(page)) | |
110 | slab++; | |
111 | else if (!page_count(page)) | |
112 | free++; | |
113 | else | |
114 | shared += page_count(page) - 1; | |
115 | page++; | |
116 | } while (page < end); | |
117 | } | |
1da177e4 LT |
118 | } |
119 | ||
120 | printk("%d pages of RAM\n", total); | |
121 | printk("%d free pages\n", free); | |
122 | printk("%d reserved pages\n", reserved); | |
123 | printk("%d slab pages\n", slab); | |
124 | printk("%d pages shared\n", shared); | |
125 | printk("%d pages swap cached\n", cached); | |
126 | } | |
127 | ||
dde5828f RK |
128 | static void __init find_node_limits(int node, struct meminfo *mi, |
129 | unsigned long *min, unsigned long *max_low, unsigned long *max_high) | |
130 | { | |
131 | int i; | |
132 | ||
133 | *min = -1UL; | |
134 | *max_low = *max_high = 0; | |
135 | ||
136 | for_each_nodebank(i, mi, node) { | |
137 | struct membank *bank = &mi->bank[i]; | |
138 | unsigned long start, end; | |
139 | ||
140 | start = bank_pfn_start(bank); | |
141 | end = bank_pfn_end(bank); | |
142 | ||
143 | if (*min > start) | |
144 | *min = start; | |
145 | if (*max_high < end) | |
146 | *max_high = end; | |
147 | if (bank->highmem) | |
148 | continue; | |
149 | if (*max_low < end) | |
150 | *max_low = end; | |
151 | } | |
152 | } | |
153 | ||
1da177e4 LT |
154 | /* |
155 | * FIXME: We really want to avoid allocating the bootmap bitmap | |
156 | * over the top of the initrd. Hopefully, this is located towards | |
157 | * the start of a bank, so if we allocate the bootmap bitmap at | |
158 | * the end, we won't clash. | |
159 | */ | |
160 | static unsigned int __init | |
161 | find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) | |
162 | { | |
d2a38ef9 | 163 | unsigned int start_pfn, i, bootmap_pfn; |
1da177e4 | 164 | |
37efe642 | 165 | start_pfn = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT; |
1da177e4 LT |
166 | bootmap_pfn = 0; |
167 | ||
d2a38ef9 RK |
168 | for_each_nodebank(i, mi, node) { |
169 | struct membank *bank = &mi->bank[i]; | |
1da177e4 LT |
170 | unsigned int start, end; |
171 | ||
d2a38ef9 RK |
172 | start = bank_pfn_start(bank); |
173 | end = bank_pfn_end(bank); | |
1da177e4 LT |
174 | |
175 | if (end < start_pfn) | |
176 | continue; | |
177 | ||
178 | if (start < start_pfn) | |
179 | start = start_pfn; | |
180 | ||
181 | if (end <= start) | |
182 | continue; | |
183 | ||
184 | if (end - start >= bootmap_pages) { | |
185 | bootmap_pfn = start; | |
186 | break; | |
187 | } | |
188 | } | |
189 | ||
190 | if (bootmap_pfn == 0) | |
191 | BUG(); | |
192 | ||
193 | return bootmap_pfn; | |
194 | } | |
195 | ||
1da177e4 LT |
196 | static int __init check_initrd(struct meminfo *mi) |
197 | { | |
198 | int initrd_node = -2; | |
199 | #ifdef CONFIG_BLK_DEV_INITRD | |
200 | unsigned long end = phys_initrd_start + phys_initrd_size; | |
201 | ||
202 | /* | |
203 | * Make sure that the initrd is within a valid area of | |
204 | * memory. | |
205 | */ | |
206 | if (phys_initrd_size) { | |
207 | unsigned int i; | |
208 | ||
209 | initrd_node = -1; | |
210 | ||
211 | for (i = 0; i < mi->nr_banks; i++) { | |
d2a38ef9 RK |
212 | struct membank *bank = &mi->bank[i]; |
213 | if (bank_phys_start(bank) <= phys_initrd_start && | |
214 | end <= bank_phys_end(bank)) | |
215 | initrd_node = bank->node; | |
1da177e4 LT |
216 | } |
217 | } | |
218 | ||
219 | if (initrd_node == -1) { | |
b962a286 | 220 | printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond " |
1da177e4 | 221 | "physical memory - disabling initrd\n", |
b962a286 | 222 | phys_initrd_start, phys_initrd_size); |
1da177e4 LT |
223 | phys_initrd_start = phys_initrd_size = 0; |
224 | } | |
225 | #endif | |
226 | ||
227 | return initrd_node; | |
228 | } | |
229 | ||
456335e2 RK |
230 | static inline void map_memory_bank(struct membank *bank) |
231 | { | |
d111e8f9 | 232 | #ifdef CONFIG_MMU |
456335e2 RK |
233 | struct map_desc map; |
234 | ||
d2a38ef9 RK |
235 | map.pfn = bank_pfn_start(bank); |
236 | map.virtual = __phys_to_virt(bank_phys_start(bank)); | |
237 | map.length = bank_phys_size(bank); | |
456335e2 RK |
238 | map.type = MT_MEMORY; |
239 | ||
240 | create_mapping(&map); | |
d111e8f9 | 241 | #endif |
456335e2 RK |
242 | } |
243 | ||
dde5828f RK |
244 | static void __init bootmem_init_node(int node, struct meminfo *mi, |
245 | unsigned long start_pfn, unsigned long end_pfn) | |
1da177e4 | 246 | { |
dde5828f | 247 | unsigned long boot_pfn; |
90072059 RK |
248 | unsigned int boot_pages; |
249 | pg_data_t *pgdat; | |
250 | int i; | |
1da177e4 | 251 | |
90072059 | 252 | /* |
dde5828f | 253 | * Map the memory banks for this node. |
90072059 RK |
254 | */ |
255 | for_each_nodebank(i, mi, node) { | |
456335e2 | 256 | struct membank *bank = &mi->bank[i]; |
90072059 | 257 | |
dde5828f RK |
258 | if (!bank->highmem) |
259 | map_memory_bank(bank); | |
90072059 | 260 | } |
1da177e4 | 261 | |
90072059 RK |
262 | /* |
263 | * Allocate the bootmem bitmap page. | |
264 | */ | |
265 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
266 | boot_pfn = find_bootmap_pfn(node, mi, boot_pages); | |
1da177e4 | 267 | |
90072059 RK |
268 | /* |
269 | * Initialise the bootmem allocator for this node, handing the | |
270 | * memory banks over to bootmem. | |
271 | */ | |
272 | node_set_online(node); | |
273 | pgdat = NODE_DATA(node); | |
274 | init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); | |
1da177e4 | 275 | |
d2a38ef9 RK |
276 | for_each_nodebank(i, mi, node) { |
277 | struct membank *bank = &mi->bank[i]; | |
dde5828f RK |
278 | if (!bank->highmem) |
279 | free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank)); | |
d2a38ef9 | 280 | } |
90072059 RK |
281 | |
282 | /* | |
283 | * Reserve the bootmem bitmap for this node. | |
284 | */ | |
285 | reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, | |
72a7fe39 | 286 | boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); |
b7a69ac3 | 287 | } |
b962a286 | 288 | |
b7a69ac3 RK |
289 | static void __init bootmem_reserve_initrd(int node) |
290 | { | |
1da177e4 | 291 | #ifdef CONFIG_BLK_DEV_INITRD |
b7a69ac3 RK |
292 | pg_data_t *pgdat = NODE_DATA(node); |
293 | int res; | |
294 | ||
295 | res = reserve_bootmem_node(pgdat, phys_initrd_start, | |
296 | phys_initrd_size, BOOTMEM_EXCLUSIVE); | |
297 | ||
298 | if (res == 0) { | |
299 | initrd_start = __phys_to_virt(phys_initrd_start); | |
300 | initrd_end = initrd_start + phys_initrd_size; | |
301 | } else { | |
302 | printk(KERN_ERR | |
303 | "INITRD: 0x%08lx+0x%08lx overlaps in-use " | |
304 | "memory region - disabling initrd\n", | |
305 | phys_initrd_start, phys_initrd_size); | |
1da177e4 LT |
306 | } |
307 | #endif | |
b7a69ac3 RK |
308 | } |
309 | ||
310 | static void __init bootmem_free_node(int node, struct meminfo *mi) | |
311 | { | |
312 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
dde5828f | 313 | unsigned long min, max_low, max_high; |
b7a69ac3 RK |
314 | int i; |
315 | ||
dde5828f | 316 | find_node_limits(node, mi, &min, &max_low, &max_high); |
1da177e4 | 317 | |
90072059 RK |
318 | /* |
319 | * initialise the zones within this node. | |
320 | */ | |
321 | memset(zone_size, 0, sizeof(zone_size)); | |
90072059 RK |
322 | |
323 | /* | |
324 | * The size of this node has already been determined. If we need | |
325 | * to do anything fancy with the allocation of this memory to the | |
326 | * zones, now is the time to do it. | |
327 | */ | |
dde5828f RK |
328 | zone_size[0] = max_low - min; |
329 | #ifdef CONFIG_HIGHMEM | |
330 | zone_size[ZONE_HIGHMEM] = max_high - max_low; | |
331 | #endif | |
90072059 RK |
332 | |
333 | /* | |
334 | * For each bank in this node, calculate the size of the holes. | |
335 | * holes = node_size - sum(bank_sizes_in_node) | |
336 | */ | |
dde5828f RK |
337 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
338 | for_each_nodebank(i, mi, node) { | |
339 | int idx = 0; | |
340 | #ifdef CONFIG_HIGHMEM | |
341 | if (mi->bank[i].highmem) | |
342 | idx = ZONE_HIGHMEM; | |
343 | #endif | |
344 | zhole_size[idx] -= bank_pfn_size(&mi->bank[i]); | |
345 | } | |
90072059 RK |
346 | |
347 | /* | |
348 | * Adjust the sizes according to any special requirements for | |
349 | * this machine type. | |
350 | */ | |
351 | arch_adjust_zones(node, zone_size, zhole_size); | |
352 | ||
dde5828f | 353 | free_area_init_node(node, zone_size, min, zhole_size); |
1da177e4 LT |
354 | } |
355 | ||
b7cfda9f RK |
356 | #ifndef CONFIG_SPARSEMEM |
357 | int pfn_valid(unsigned long pfn) | |
358 | { | |
359 | struct meminfo *mi = &meminfo; | |
360 | unsigned int left = 0, right = mi->nr_banks; | |
361 | ||
362 | do { | |
363 | unsigned int mid = (right + left) / 2; | |
364 | struct membank *bank = &mi->bank[mid]; | |
365 | ||
366 | if (pfn < bank_pfn_start(bank)) | |
367 | right = mid; | |
368 | else if (pfn >= bank_pfn_end(bank)) | |
369 | left = mid + 1; | |
370 | else | |
371 | return 1; | |
372 | } while (left < right); | |
373 | return 0; | |
374 | } | |
375 | EXPORT_SYMBOL(pfn_valid); | |
657e12fd RK |
376 | |
377 | static void arm_memory_present(struct meminfo *mi, int node) | |
378 | { | |
379 | } | |
380 | #else | |
381 | static void arm_memory_present(struct meminfo *mi, int node) | |
382 | { | |
383 | int i; | |
384 | for_each_nodebank(i, mi, node) { | |
385 | struct membank *bank = &mi->bank[i]; | |
386 | memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank)); | |
387 | } | |
388 | } | |
b7cfda9f RK |
389 | #endif |
390 | ||
391 | static int __init meminfo_cmp(const void *_a, const void *_b) | |
392 | { | |
393 | const struct membank *a = _a, *b = _b; | |
394 | long cmp = bank_pfn_start(a) - bank_pfn_start(b); | |
395 | return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; | |
396 | } | |
397 | ||
4b5f32ce | 398 | void __init bootmem_init(void) |
1da177e4 | 399 | { |
4b5f32ce | 400 | struct meminfo *mi = &meminfo; |
dde5828f | 401 | unsigned long min, max_low, max_high; |
eca73214 | 402 | int node, initrd_node; |
1da177e4 | 403 | |
b7cfda9f RK |
404 | sort(&mi->bank, mi->nr_banks, sizeof(mi->bank[0]), meminfo_cmp, NULL); |
405 | ||
1da177e4 | 406 | /* |
90072059 | 407 | * Locate which node contains the ramdisk image, if any. |
1da177e4 | 408 | */ |
90072059 | 409 | initrd_node = check_initrd(mi); |
1da177e4 | 410 | |
dde5828f RK |
411 | max_low = max_high = 0; |
412 | ||
90072059 RK |
413 | /* |
414 | * Run through each node initialising the bootmem allocator. | |
415 | */ | |
416 | for_each_node(node) { | |
dde5828f RK |
417 | unsigned long node_low, node_high; |
418 | ||
419 | find_node_limits(node, mi, &min, &node_low, &node_high); | |
420 | ||
421 | if (node_low > max_low) | |
422 | max_low = node_low; | |
423 | if (node_high > max_high) | |
424 | max_high = node_high; | |
425 | ||
426 | /* | |
427 | * If there is no memory in this node, ignore it. | |
428 | * (We can't have nodes which have no lowmem) | |
429 | */ | |
430 | if (node_low == 0) | |
431 | continue; | |
432 | ||
433 | bootmem_init_node(node, mi, min, node_low); | |
1da177e4 | 434 | |
b7a69ac3 RK |
435 | /* |
436 | * Reserve any special node zero regions. | |
437 | */ | |
438 | if (node == 0) | |
439 | reserve_node_zero(NODE_DATA(node)); | |
440 | ||
441 | /* | |
442 | * If the initrd is in this node, reserve its memory. | |
443 | */ | |
444 | if (node == initrd_node) | |
445 | bootmem_reserve_initrd(node); | |
657e12fd RK |
446 | |
447 | /* | |
448 | * Sparsemem tries to allocate bootmem in memory_present(), | |
449 | * so must be done after the fixed reservations | |
450 | */ | |
451 | arm_memory_present(mi, node); | |
90072059 | 452 | } |
1da177e4 | 453 | |
b7a69ac3 RK |
454 | /* |
455 | * sparse_init() needs the bootmem allocator up and running. | |
456 | */ | |
457 | sparse_init(); | |
458 | ||
459 | /* | |
460 | * Now free memory in each node - free_area_init_node needs | |
461 | * the sparse mem_map arrays initialized by sparse_init() | |
462 | * for memmap_init_zone(), otherwise all PFNs are invalid. | |
463 | */ | |
464 | for_each_node(node) | |
465 | bootmem_free_node(node, mi); | |
466 | ||
dde5828f | 467 | high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1; |
1da177e4 | 468 | |
90072059 RK |
469 | /* |
470 | * This doesn't seem to be used by the Linux memory manager any | |
471 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
472 | * also get rid of some of the stuff above as well. | |
473 | * | |
474 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in | |
475 | * the system, not the maximum PFN. | |
476 | */ | |
dde5828f RK |
477 | max_low_pfn = max_low - PHYS_PFN_OFFSET; |
478 | max_pfn = max_high - PHYS_PFN_OFFSET; | |
90072059 | 479 | } |
1da177e4 | 480 | |
6db015e4 | 481 | static inline int free_area(unsigned long pfn, unsigned long end, char *s) |
1da177e4 | 482 | { |
6db015e4 | 483 | unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); |
1da177e4 | 484 | |
6db015e4 NP |
485 | for (; pfn < end; pfn++) { |
486 | struct page *page = pfn_to_page(pfn); | |
1da177e4 | 487 | ClearPageReserved(page); |
7835e98b | 488 | init_page_count(page); |
6db015e4 NP |
489 | __free_page(page); |
490 | pages++; | |
1da177e4 LT |
491 | } |
492 | ||
493 | if (size && s) | |
494 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); | |
6db015e4 NP |
495 | |
496 | return pages; | |
1da177e4 LT |
497 | } |
498 | ||
a013053d RK |
499 | static inline void |
500 | free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) | |
501 | { | |
502 | struct page *start_pg, *end_pg; | |
503 | unsigned long pg, pgend; | |
504 | ||
505 | /* | |
506 | * Convert start_pfn/end_pfn to a struct page pointer. | |
507 | */ | |
3257f43d | 508 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
a013053d RK |
509 | end_pg = pfn_to_page(end_pfn); |
510 | ||
511 | /* | |
512 | * Convert to physical addresses, and | |
513 | * round start upwards and end downwards. | |
514 | */ | |
515 | pg = PAGE_ALIGN(__pa(start_pg)); | |
516 | pgend = __pa(end_pg) & PAGE_MASK; | |
517 | ||
518 | /* | |
519 | * If there are free pages between these, | |
520 | * free the section of the memmap array. | |
521 | */ | |
522 | if (pg < pgend) | |
523 | free_bootmem_node(NODE_DATA(node), pg, pgend - pg); | |
524 | } | |
525 | ||
526 | /* | |
527 | * The mem_map array can get very big. Free the unused area of the memory map. | |
528 | */ | |
529 | static void __init free_unused_memmap_node(int node, struct meminfo *mi) | |
530 | { | |
531 | unsigned long bank_start, prev_bank_end = 0; | |
532 | unsigned int i; | |
533 | ||
534 | /* | |
535 | * [FIXME] This relies on each bank being in address order. This | |
536 | * may not be the case, especially if the user has provided the | |
537 | * information on the command line. | |
538 | */ | |
90072059 | 539 | for_each_nodebank(i, mi, node) { |
d2a38ef9 RK |
540 | struct membank *bank = &mi->bank[i]; |
541 | ||
542 | bank_start = bank_pfn_start(bank); | |
a013053d RK |
543 | if (bank_start < prev_bank_end) { |
544 | printk(KERN_ERR "MEM: unordered memory banks. " | |
545 | "Not freeing memmap.\n"); | |
546 | break; | |
547 | } | |
548 | ||
549 | /* | |
550 | * If we had a previous bank, and there is a space | |
551 | * between the current bank and the previous, free it. | |
552 | */ | |
553 | if (prev_bank_end && prev_bank_end != bank_start) | |
554 | free_memmap(node, prev_bank_end, bank_start); | |
555 | ||
d2a38ef9 | 556 | prev_bank_end = bank_pfn_end(bank); |
a013053d RK |
557 | } |
558 | } | |
559 | ||
1da177e4 LT |
560 | /* |
561 | * mem_init() marks the free areas in the mem_map and tells us how much | |
562 | * memory is free. This is done after various parts of the system have | |
563 | * claimed their memory after the kernel image. | |
564 | */ | |
565 | void __init mem_init(void) | |
566 | { | |
db9ef1af | 567 | unsigned long reserved_pages, free_pages; |
1da177e4 LT |
568 | int i, node; |
569 | ||
1da177e4 | 570 | #ifndef CONFIG_DISCONTIGMEM |
3835f6cb | 571 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
1da177e4 LT |
572 | #endif |
573 | ||
1da177e4 LT |
574 | /* this will put all unused low memory onto the freelists */ |
575 | for_each_online_node(node) { | |
576 | pg_data_t *pgdat = NODE_DATA(node); | |
577 | ||
a013053d RK |
578 | free_unused_memmap_node(node, &meminfo); |
579 | ||
1da177e4 LT |
580 | if (pgdat->node_spanned_pages != 0) |
581 | totalram_pages += free_all_bootmem_node(pgdat); | |
582 | } | |
583 | ||
584 | #ifdef CONFIG_SA1111 | |
585 | /* now that our DMA memory is actually so designated, we can free it */ | |
6db015e4 NP |
586 | totalram_pages += free_area(PHYS_PFN_OFFSET, |
587 | __phys_to_pfn(__pa(swapper_pg_dir)), NULL); | |
1da177e4 LT |
588 | #endif |
589 | ||
3835f6cb NP |
590 | #ifdef CONFIG_HIGHMEM |
591 | /* set highmem page free */ | |
592 | for_each_online_node(node) { | |
593 | for_each_nodebank (i, &meminfo, node) { | |
594 | unsigned long start = bank_pfn_start(&meminfo.bank[i]); | |
595 | unsigned long end = bank_pfn_end(&meminfo.bank[i]); | |
596 | if (start >= max_low_pfn + PHYS_PFN_OFFSET) | |
597 | totalhigh_pages += free_area(start, end, NULL); | |
598 | } | |
599 | } | |
600 | totalram_pages += totalhigh_pages; | |
601 | #endif | |
602 | ||
db9ef1af FB |
603 | reserved_pages = free_pages = 0; |
604 | ||
605 | for_each_online_node(node) { | |
606 | pg_data_t *n = NODE_DATA(node); | |
607 | struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn; | |
608 | ||
609 | for_each_nodebank(i, &meminfo, node) { | |
610 | struct membank *bank = &meminfo.bank[i]; | |
611 | unsigned int pfn1, pfn2; | |
612 | struct page *page, *end; | |
613 | ||
614 | pfn1 = bank_pfn_start(bank); | |
615 | pfn2 = bank_pfn_end(bank); | |
616 | ||
617 | page = map + pfn1; | |
618 | end = map + pfn2; | |
619 | ||
620 | do { | |
621 | if (PageReserved(page)) | |
622 | reserved_pages++; | |
623 | else if (!page_count(page)) | |
624 | free_pages++; | |
625 | page++; | |
626 | } while (page < end); | |
627 | } | |
628 | } | |
629 | ||
1da177e4 LT |
630 | /* |
631 | * Since our memory may not be contiguous, calculate the | |
632 | * real number of pages we have in this system | |
633 | */ | |
634 | printk(KERN_INFO "Memory:"); | |
1da177e4 LT |
635 | num_physpages = 0; |
636 | for (i = 0; i < meminfo.nr_banks; i++) { | |
d2a38ef9 RK |
637 | num_physpages += bank_pfn_size(&meminfo.bank[i]); |
638 | printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); | |
1da177e4 | 639 | } |
1da177e4 | 640 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); |
6db015e4 | 641 | |
db9ef1af FB |
642 | printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", |
643 | nr_free_pages() << (PAGE_SHIFT-10), | |
644 | free_pages << (PAGE_SHIFT-10), | |
645 | reserved_pages << (PAGE_SHIFT-10), | |
4b529401 | 646 | totalhigh_pages << (PAGE_SHIFT-10)); |
1da177e4 | 647 | |
db9ef1af FB |
648 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
649 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
650 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
651 | ||
652 | printk(KERN_NOTICE "Virtual kernel memory layout:\n" | |
653 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
654 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
a7bd08c8 FB |
655 | #ifdef CONFIG_MMU |
656 | " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
657 | #endif | |
db9ef1af FB |
658 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
659 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
660 | #ifdef CONFIG_HIGHMEM | |
661 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
662 | #endif | |
663 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
664 | " .init : 0x%p" " - 0x%p" " (%4d kB)\n" | |
665 | " .text : 0x%p" " - 0x%p" " (%4d kB)\n" | |
666 | " .data : 0x%p" " - 0x%p" " (%4d kB)\n", | |
667 | ||
668 | MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + | |
669 | (PAGE_SIZE)), | |
670 | MLK(FIXADDR_START, FIXADDR_TOP), | |
a7bd08c8 FB |
671 | #ifdef CONFIG_MMU |
672 | MLM(CONSISTENT_BASE, CONSISTENT_END), | |
673 | #endif | |
c931b4f6 | 674 | MLM(VMALLOC_START, VMALLOC_END), |
db9ef1af FB |
675 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
676 | #ifdef CONFIG_HIGHMEM | |
677 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * | |
678 | (PAGE_SIZE)), | |
679 | #endif | |
680 | MLM(MODULES_VADDR, MODULES_END), | |
681 | ||
682 | MLK_ROUNDUP(__init_begin, __init_end), | |
683 | MLK_ROUNDUP(_text, _etext), | |
684 | MLK_ROUNDUP(_data, _edata)); | |
685 | ||
686 | #undef MLK | |
687 | #undef MLM | |
688 | #undef MLK_ROUNDUP | |
689 | ||
a1839272 FB |
690 | /* |
691 | * Check boundaries twice: Some fundamental inconsistencies can | |
692 | * be detected at build time already. | |
693 | */ | |
694 | #ifdef CONFIG_MMU | |
695 | BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); | |
696 | BUG_ON(VMALLOC_END > CONSISTENT_BASE); | |
697 | ||
698 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); | |
699 | BUG_ON(TASK_SIZE > MODULES_VADDR); | |
700 | #endif | |
701 | ||
702 | #ifdef CONFIG_HIGHMEM | |
703 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
704 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); | |
705 | #endif | |
706 | ||
1da177e4 LT |
707 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { |
708 | extern int sysctl_overcommit_memory; | |
709 | /* | |
710 | * On a machine this small we won't get | |
711 | * anywhere without overcommit, so turn | |
712 | * it on by default. | |
713 | */ | |
714 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
715 | } | |
716 | } | |
717 | ||
718 | void free_initmem(void) | |
719 | { | |
bc581770 LW |
720 | #ifdef CONFIG_HAVE_TCM |
721 | extern char *__tcm_start, *__tcm_end; | |
722 | ||
723 | totalram_pages += free_area(__phys_to_pfn(__pa(__tcm_start)), | |
724 | __phys_to_pfn(__pa(__tcm_end)), | |
725 | "TCM link"); | |
726 | #endif | |
727 | ||
6db015e4 | 728 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
37efe642 RK |
729 | totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), |
730 | __phys_to_pfn(__pa(__init_end)), | |
6db015e4 | 731 | "init"); |
1da177e4 LT |
732 | } |
733 | ||
734 | #ifdef CONFIG_BLK_DEV_INITRD | |
735 | ||
736 | static int keep_initrd; | |
737 | ||
738 | void free_initrd_mem(unsigned long start, unsigned long end) | |
739 | { | |
740 | if (!keep_initrd) | |
6db015e4 NP |
741 | totalram_pages += free_area(__phys_to_pfn(__pa(start)), |
742 | __phys_to_pfn(__pa(end)), | |
743 | "initrd"); | |
1da177e4 LT |
744 | } |
745 | ||
746 | static int __init keepinitrd_setup(char *__unused) | |
747 | { | |
748 | keep_initrd = 1; | |
749 | return 1; | |
750 | } | |
751 | ||
752 | __setup("keepinitrd", keepinitrd_setup); | |
753 | #endif |