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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> | |
18 | ||
19 | #include <asm/mach-types.h> | |
1da177e4 | 20 | #include <asm/setup.h> |
74d02fb9 | 21 | #include <asm/sizes.h> |
1da177e4 LT |
22 | #include <asm/tlb.h> |
23 | ||
24 | #include <asm/mach/arch.h> | |
25 | #include <asm/mach/map.h> | |
26 | ||
1b2e2b73 RK |
27 | #include "mm.h" |
28 | ||
012d1f4a RK |
29 | static unsigned long phys_initrd_start __initdata = 0; |
30 | static unsigned long phys_initrd_size __initdata = 0; | |
31 | ||
32 | static void __init early_initrd(char **p) | |
33 | { | |
34 | unsigned long start, size; | |
35 | ||
36 | start = memparse(*p, p); | |
37 | if (**p == ',') { | |
38 | size = memparse((*p) + 1, p); | |
39 | ||
40 | phys_initrd_start = start; | |
41 | phys_initrd_size = size; | |
42 | } | |
43 | } | |
44 | __early_param("initrd=", early_initrd); | |
45 | ||
46 | static int __init parse_tag_initrd(const struct tag *tag) | |
47 | { | |
48 | printk(KERN_WARNING "ATAG_INITRD is deprecated; " | |
49 | "please update your bootloader.\n"); | |
50 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); | |
51 | phys_initrd_size = tag->u.initrd.size; | |
52 | return 0; | |
53 | } | |
54 | ||
55 | __tagtable(ATAG_INITRD, parse_tag_initrd); | |
56 | ||
57 | static int __init parse_tag_initrd2(const struct tag *tag) | |
58 | { | |
59 | phys_initrd_start = tag->u.initrd.start; | |
60 | phys_initrd_size = tag->u.initrd.size; | |
61 | return 0; | |
62 | } | |
63 | ||
64 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); | |
1da177e4 LT |
65 | |
66 | /* | |
5e709827 RL |
67 | * This is used to pass memory configuration data from paging_init |
68 | * to mem_init, and by show_mem() to skip holes in the memory map. | |
1da177e4 | 69 | */ |
5e709827 RL |
70 | static struct meminfo meminfo = { 0, }; |
71 | ||
72 | #define for_each_nodebank(iter,mi,no) \ | |
73 | for (iter = 0; iter < mi->nr_banks; iter++) \ | |
74 | if (mi->bank[iter].node == no) | |
1da177e4 | 75 | |
1da177e4 LT |
76 | void show_mem(void) |
77 | { | |
78 | int free = 0, total = 0, reserved = 0; | |
5e709827 RL |
79 | int shared = 0, cached = 0, slab = 0, node, i; |
80 | struct meminfo * mi = &meminfo; | |
1da177e4 LT |
81 | |
82 | printk("Mem-info:\n"); | |
83 | show_free_areas(); | |
1da177e4 | 84 | for_each_online_node(node) { |
204ecae4 RK |
85 | pg_data_t *n = NODE_DATA(node); |
86 | struct page *map = n->node_mem_map - n->node_start_pfn; | |
87 | ||
5e709827 RL |
88 | for_each_nodebank (i,mi,node) { |
89 | unsigned int pfn1, pfn2; | |
90 | struct page *page, *end; | |
91 | ||
204ecae4 RK |
92 | pfn1 = __phys_to_pfn(mi->bank[i].start); |
93 | pfn2 = __phys_to_pfn(mi->bank[i].size + mi->bank[i].start); | |
5e709827 | 94 | |
204ecae4 RK |
95 | page = map + pfn1; |
96 | end = map + pfn2; | |
5e709827 RL |
97 | |
98 | do { | |
99 | total++; | |
100 | if (PageReserved(page)) | |
101 | reserved++; | |
102 | else if (PageSwapCache(page)) | |
103 | cached++; | |
104 | else if (PageSlab(page)) | |
105 | slab++; | |
106 | else if (!page_count(page)) | |
107 | free++; | |
108 | else | |
109 | shared += page_count(page) - 1; | |
110 | page++; | |
111 | } while (page < end); | |
112 | } | |
1da177e4 LT |
113 | } |
114 | ||
115 | printk("%d pages of RAM\n", total); | |
116 | printk("%d free pages\n", free); | |
117 | printk("%d reserved pages\n", reserved); | |
118 | printk("%d slab pages\n", slab); | |
119 | printk("%d pages shared\n", shared); | |
120 | printk("%d pages swap cached\n", cached); | |
121 | } | |
122 | ||
1da177e4 LT |
123 | /* |
124 | * FIXME: We really want to avoid allocating the bootmap bitmap | |
125 | * over the top of the initrd. Hopefully, this is located towards | |
126 | * the start of a bank, so if we allocate the bootmap bitmap at | |
127 | * the end, we won't clash. | |
128 | */ | |
129 | static unsigned int __init | |
130 | find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) | |
131 | { | |
132 | unsigned int start_pfn, bank, bootmap_pfn; | |
133 | ||
90072059 | 134 | start_pfn = PAGE_ALIGN(__pa(&_end)) >> PAGE_SHIFT; |
1da177e4 LT |
135 | bootmap_pfn = 0; |
136 | ||
90072059 | 137 | for_each_nodebank(bank, mi, node) { |
1da177e4 LT |
138 | unsigned int start, end; |
139 | ||
92a8cbed RK |
140 | start = mi->bank[bank].start >> PAGE_SHIFT; |
141 | end = (mi->bank[bank].size + | |
142 | mi->bank[bank].start) >> PAGE_SHIFT; | |
1da177e4 LT |
143 | |
144 | if (end < start_pfn) | |
145 | continue; | |
146 | ||
147 | if (start < start_pfn) | |
148 | start = start_pfn; | |
149 | ||
150 | if (end <= start) | |
151 | continue; | |
152 | ||
153 | if (end - start >= bootmap_pages) { | |
154 | bootmap_pfn = start; | |
155 | break; | |
156 | } | |
157 | } | |
158 | ||
159 | if (bootmap_pfn == 0) | |
160 | BUG(); | |
161 | ||
162 | return bootmap_pfn; | |
163 | } | |
164 | ||
1da177e4 LT |
165 | static int __init check_initrd(struct meminfo *mi) |
166 | { | |
167 | int initrd_node = -2; | |
168 | #ifdef CONFIG_BLK_DEV_INITRD | |
169 | unsigned long end = phys_initrd_start + phys_initrd_size; | |
170 | ||
171 | /* | |
172 | * Make sure that the initrd is within a valid area of | |
173 | * memory. | |
174 | */ | |
175 | if (phys_initrd_size) { | |
176 | unsigned int i; | |
177 | ||
178 | initrd_node = -1; | |
179 | ||
180 | for (i = 0; i < mi->nr_banks; i++) { | |
181 | unsigned long bank_end; | |
182 | ||
183 | bank_end = mi->bank[i].start + mi->bank[i].size; | |
184 | ||
185 | if (mi->bank[i].start <= phys_initrd_start && | |
186 | end <= bank_end) | |
187 | initrd_node = mi->bank[i].node; | |
188 | } | |
189 | } | |
190 | ||
191 | if (initrd_node == -1) { | |
b962a286 | 192 | printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond " |
1da177e4 | 193 | "physical memory - disabling initrd\n", |
b962a286 | 194 | phys_initrd_start, phys_initrd_size); |
1da177e4 LT |
195 | phys_initrd_start = phys_initrd_size = 0; |
196 | } | |
197 | #endif | |
198 | ||
199 | return initrd_node; | |
200 | } | |
201 | ||
456335e2 RK |
202 | static inline void map_memory_bank(struct membank *bank) |
203 | { | |
d111e8f9 | 204 | #ifdef CONFIG_MMU |
456335e2 RK |
205 | struct map_desc map; |
206 | ||
207 | map.pfn = __phys_to_pfn(bank->start); | |
208 | map.virtual = __phys_to_virt(bank->start); | |
209 | map.length = bank->size; | |
210 | map.type = MT_MEMORY; | |
211 | ||
212 | create_mapping(&map); | |
d111e8f9 | 213 | #endif |
456335e2 RK |
214 | } |
215 | ||
90072059 RK |
216 | static unsigned long __init |
217 | bootmem_init_node(int node, int initrd_node, struct meminfo *mi) | |
1da177e4 | 218 | { |
90072059 RK |
219 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; |
220 | unsigned long start_pfn, end_pfn, boot_pfn; | |
221 | unsigned int boot_pages; | |
222 | pg_data_t *pgdat; | |
223 | int i; | |
1da177e4 | 224 | |
90072059 RK |
225 | start_pfn = -1UL; |
226 | end_pfn = 0; | |
1da177e4 | 227 | |
90072059 RK |
228 | /* |
229 | * Calculate the pfn range, and map the memory banks for this node. | |
230 | */ | |
231 | for_each_nodebank(i, mi, node) { | |
456335e2 | 232 | struct membank *bank = &mi->bank[i]; |
90072059 | 233 | unsigned long start, end; |
1da177e4 | 234 | |
456335e2 RK |
235 | start = bank->start >> PAGE_SHIFT; |
236 | end = (bank->start + bank->size) >> PAGE_SHIFT; | |
1da177e4 | 237 | |
90072059 RK |
238 | if (start_pfn > start) |
239 | start_pfn = start; | |
240 | if (end_pfn < end) | |
241 | end_pfn = end; | |
242 | ||
456335e2 | 243 | map_memory_bank(bank); |
90072059 | 244 | } |
1da177e4 LT |
245 | |
246 | /* | |
90072059 | 247 | * If there is no memory in this node, ignore it. |
1da177e4 | 248 | */ |
90072059 RK |
249 | if (end_pfn == 0) |
250 | return end_pfn; | |
1da177e4 | 251 | |
90072059 RK |
252 | /* |
253 | * Allocate the bootmem bitmap page. | |
254 | */ | |
255 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
256 | boot_pfn = find_bootmap_pfn(node, mi, boot_pages); | |
1da177e4 | 257 | |
90072059 RK |
258 | /* |
259 | * Initialise the bootmem allocator for this node, handing the | |
260 | * memory banks over to bootmem. | |
261 | */ | |
262 | node_set_online(node); | |
263 | pgdat = NODE_DATA(node); | |
264 | init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); | |
1da177e4 | 265 | |
90072059 RK |
266 | for_each_nodebank(i, mi, node) |
267 | free_bootmem_node(pgdat, mi->bank[i].start, mi->bank[i].size); | |
268 | ||
269 | /* | |
270 | * Reserve the bootmem bitmap for this node. | |
271 | */ | |
272 | reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, | |
72a7fe39 | 273 | boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); |
1da177e4 | 274 | |
b962a286 RK |
275 | /* |
276 | * Reserve any special node zero regions. | |
277 | */ | |
278 | if (node == 0) | |
279 | reserve_node_zero(pgdat); | |
280 | ||
1da177e4 | 281 | #ifdef CONFIG_BLK_DEV_INITRD |
90072059 RK |
282 | /* |
283 | * If the initrd is in this node, reserve its memory. | |
284 | */ | |
285 | if (node == initrd_node) { | |
b962a286 RK |
286 | int res = reserve_bootmem_node(pgdat, phys_initrd_start, |
287 | phys_initrd_size, BOOTMEM_EXCLUSIVE); | |
288 | ||
289 | if (res == 0) { | |
290 | initrd_start = __phys_to_virt(phys_initrd_start); | |
291 | initrd_end = initrd_start + phys_initrd_size; | |
292 | } else { | |
293 | printk(KERN_ERR | |
294 | "INITRD: 0x%08lx+0x%08lx overlaps in-use " | |
295 | "memory region - disabling initrd\n", | |
296 | phys_initrd_start, phys_initrd_size); | |
297 | } | |
1da177e4 LT |
298 | } |
299 | #endif | |
300 | ||
90072059 RK |
301 | /* |
302 | * initialise the zones within this node. | |
303 | */ | |
304 | memset(zone_size, 0, sizeof(zone_size)); | |
305 | memset(zhole_size, 0, sizeof(zhole_size)); | |
306 | ||
307 | /* | |
308 | * The size of this node has already been determined. If we need | |
309 | * to do anything fancy with the allocation of this memory to the | |
310 | * zones, now is the time to do it. | |
311 | */ | |
312 | zone_size[0] = end_pfn - start_pfn; | |
313 | ||
314 | /* | |
315 | * For each bank in this node, calculate the size of the holes. | |
316 | * holes = node_size - sum(bank_sizes_in_node) | |
317 | */ | |
318 | zhole_size[0] = zone_size[0]; | |
319 | for_each_nodebank(i, mi, node) | |
320 | zhole_size[0] -= mi->bank[i].size >> PAGE_SHIFT; | |
321 | ||
322 | /* | |
323 | * Adjust the sizes according to any special requirements for | |
324 | * this machine type. | |
325 | */ | |
326 | arch_adjust_zones(node, zone_size, zhole_size); | |
327 | ||
9109fb7b | 328 | free_area_init_node(node, zone_size, start_pfn, zhole_size); |
90072059 RK |
329 | |
330 | return end_pfn; | |
1da177e4 LT |
331 | } |
332 | ||
d111e8f9 | 333 | void __init bootmem_init(struct meminfo *mi) |
1da177e4 | 334 | { |
456335e2 | 335 | unsigned long memend_pfn = 0; |
eca73214 | 336 | int node, initrd_node; |
1da177e4 LT |
337 | |
338 | memcpy(&meminfo, mi, sizeof(meminfo)); | |
339 | ||
1da177e4 | 340 | /* |
90072059 | 341 | * Locate which node contains the ramdisk image, if any. |
1da177e4 | 342 | */ |
90072059 | 343 | initrd_node = check_initrd(mi); |
1da177e4 | 344 | |
90072059 RK |
345 | /* |
346 | * Run through each node initialising the bootmem allocator. | |
347 | */ | |
348 | for_each_node(node) { | |
349 | unsigned long end_pfn; | |
1da177e4 | 350 | |
90072059 | 351 | end_pfn = bootmem_init_node(node, initrd_node, mi); |
1da177e4 LT |
352 | |
353 | /* | |
90072059 | 354 | * Remember the highest memory PFN. |
1da177e4 | 355 | */ |
90072059 RK |
356 | if (end_pfn > memend_pfn) |
357 | memend_pfn = end_pfn; | |
358 | } | |
1da177e4 | 359 | |
90072059 | 360 | high_memory = __va(memend_pfn << PAGE_SHIFT); |
1da177e4 | 361 | |
90072059 RK |
362 | /* |
363 | * This doesn't seem to be used by the Linux memory manager any | |
364 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
365 | * also get rid of some of the stuff above as well. | |
366 | * | |
367 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in | |
368 | * the system, not the maximum PFN. | |
369 | */ | |
370 | max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET; | |
371 | } | |
1da177e4 | 372 | |
1da177e4 LT |
373 | static inline void free_area(unsigned long addr, unsigned long end, char *s) |
374 | { | |
375 | unsigned int size = (end - addr) >> 10; | |
376 | ||
377 | for (; addr < end; addr += PAGE_SIZE) { | |
378 | struct page *page = virt_to_page(addr); | |
379 | ClearPageReserved(page); | |
7835e98b | 380 | init_page_count(page); |
1da177e4 LT |
381 | free_page(addr); |
382 | totalram_pages++; | |
383 | } | |
384 | ||
385 | if (size && s) | |
386 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); | |
387 | } | |
388 | ||
a013053d RK |
389 | static inline void |
390 | free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) | |
391 | { | |
392 | struct page *start_pg, *end_pg; | |
393 | unsigned long pg, pgend; | |
394 | ||
395 | /* | |
396 | * Convert start_pfn/end_pfn to a struct page pointer. | |
397 | */ | |
398 | start_pg = pfn_to_page(start_pfn); | |
399 | end_pg = pfn_to_page(end_pfn); | |
400 | ||
401 | /* | |
402 | * Convert to physical addresses, and | |
403 | * round start upwards and end downwards. | |
404 | */ | |
405 | pg = PAGE_ALIGN(__pa(start_pg)); | |
406 | pgend = __pa(end_pg) & PAGE_MASK; | |
407 | ||
408 | /* | |
409 | * If there are free pages between these, | |
410 | * free the section of the memmap array. | |
411 | */ | |
412 | if (pg < pgend) | |
413 | free_bootmem_node(NODE_DATA(node), pg, pgend - pg); | |
414 | } | |
415 | ||
416 | /* | |
417 | * The mem_map array can get very big. Free the unused area of the memory map. | |
418 | */ | |
419 | static void __init free_unused_memmap_node(int node, struct meminfo *mi) | |
420 | { | |
421 | unsigned long bank_start, prev_bank_end = 0; | |
422 | unsigned int i; | |
423 | ||
424 | /* | |
425 | * [FIXME] This relies on each bank being in address order. This | |
426 | * may not be the case, especially if the user has provided the | |
427 | * information on the command line. | |
428 | */ | |
90072059 | 429 | for_each_nodebank(i, mi, node) { |
a013053d RK |
430 | bank_start = mi->bank[i].start >> PAGE_SHIFT; |
431 | if (bank_start < prev_bank_end) { | |
432 | printk(KERN_ERR "MEM: unordered memory banks. " | |
433 | "Not freeing memmap.\n"); | |
434 | break; | |
435 | } | |
436 | ||
437 | /* | |
438 | * If we had a previous bank, and there is a space | |
439 | * between the current bank and the previous, free it. | |
440 | */ | |
441 | if (prev_bank_end && prev_bank_end != bank_start) | |
442 | free_memmap(node, prev_bank_end, bank_start); | |
443 | ||
444 | prev_bank_end = (mi->bank[i].start + | |
445 | mi->bank[i].size) >> PAGE_SHIFT; | |
446 | } | |
447 | } | |
448 | ||
1da177e4 LT |
449 | /* |
450 | * mem_init() marks the free areas in the mem_map and tells us how much | |
451 | * memory is free. This is done after various parts of the system have | |
452 | * claimed their memory after the kernel image. | |
453 | */ | |
454 | void __init mem_init(void) | |
455 | { | |
456 | unsigned int codepages, datapages, initpages; | |
457 | int i, node; | |
458 | ||
459 | codepages = &_etext - &_text; | |
460 | datapages = &_end - &__data_start; | |
461 | initpages = &__init_end - &__init_begin; | |
462 | ||
463 | #ifndef CONFIG_DISCONTIGMEM | |
464 | max_mapnr = virt_to_page(high_memory) - mem_map; | |
465 | #endif | |
466 | ||
1da177e4 LT |
467 | /* this will put all unused low memory onto the freelists */ |
468 | for_each_online_node(node) { | |
469 | pg_data_t *pgdat = NODE_DATA(node); | |
470 | ||
a013053d RK |
471 | free_unused_memmap_node(node, &meminfo); |
472 | ||
1da177e4 LT |
473 | if (pgdat->node_spanned_pages != 0) |
474 | totalram_pages += free_all_bootmem_node(pgdat); | |
475 | } | |
476 | ||
477 | #ifdef CONFIG_SA1111 | |
478 | /* now that our DMA memory is actually so designated, we can free it */ | |
479 | free_area(PAGE_OFFSET, (unsigned long)swapper_pg_dir, NULL); | |
480 | #endif | |
481 | ||
482 | /* | |
483 | * Since our memory may not be contiguous, calculate the | |
484 | * real number of pages we have in this system | |
485 | */ | |
486 | printk(KERN_INFO "Memory:"); | |
487 | ||
488 | num_physpages = 0; | |
489 | for (i = 0; i < meminfo.nr_banks; i++) { | |
490 | num_physpages += meminfo.bank[i].size >> PAGE_SHIFT; | |
491 | printk(" %ldMB", meminfo.bank[i].size >> 20); | |
492 | } | |
493 | ||
494 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); | |
495 | printk(KERN_NOTICE "Memory: %luKB available (%dK code, " | |
496 | "%dK data, %dK init)\n", | |
497 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
498 | codepages >> 10, datapages >> 10, initpages >> 10); | |
499 | ||
500 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { | |
501 | extern int sysctl_overcommit_memory; | |
502 | /* | |
503 | * On a machine this small we won't get | |
504 | * anywhere without overcommit, so turn | |
505 | * it on by default. | |
506 | */ | |
507 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
508 | } | |
509 | } | |
510 | ||
511 | void free_initmem(void) | |
512 | { | |
513 | if (!machine_is_integrator() && !machine_is_cintegrator()) { | |
514 | free_area((unsigned long)(&__init_begin), | |
515 | (unsigned long)(&__init_end), | |
516 | "init"); | |
517 | } | |
518 | } | |
519 | ||
520 | #ifdef CONFIG_BLK_DEV_INITRD | |
521 | ||
522 | static int keep_initrd; | |
523 | ||
524 | void free_initrd_mem(unsigned long start, unsigned long end) | |
525 | { | |
526 | if (!keep_initrd) | |
527 | free_area(start, end, "initrd"); | |
528 | } | |
529 | ||
530 | static int __init keepinitrd_setup(char *__unused) | |
531 | { | |
532 | keep_initrd = 1; | |
533 | return 1; | |
534 | } | |
535 | ||
536 | __setup("keepinitrd", keepinitrd_setup); | |
537 | #endif |