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> | |
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 | ||
d111e8f9 | 29 | extern void _text, _etext, __data_start, _end, __init_begin, __init_end; |
1da177e4 LT |
30 | extern unsigned long phys_initrd_start; |
31 | extern unsigned long phys_initrd_size; | |
32 | ||
33 | /* | |
5e709827 RL |
34 | * This is used to pass memory configuration data from paging_init |
35 | * to mem_init, and by show_mem() to skip holes in the memory map. | |
1da177e4 | 36 | */ |
5e709827 RL |
37 | static struct meminfo meminfo = { 0, }; |
38 | ||
39 | #define for_each_nodebank(iter,mi,no) \ | |
40 | for (iter = 0; iter < mi->nr_banks; iter++) \ | |
41 | if (mi->bank[iter].node == no) | |
1da177e4 | 42 | |
1da177e4 LT |
43 | void show_mem(void) |
44 | { | |
45 | int free = 0, total = 0, reserved = 0; | |
5e709827 RL |
46 | int shared = 0, cached = 0, slab = 0, node, i; |
47 | struct meminfo * mi = &meminfo; | |
1da177e4 LT |
48 | |
49 | printk("Mem-info:\n"); | |
50 | show_free_areas(); | |
51 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
52 | ||
53 | for_each_online_node(node) { | |
204ecae4 RK |
54 | pg_data_t *n = NODE_DATA(node); |
55 | struct page *map = n->node_mem_map - n->node_start_pfn; | |
56 | ||
5e709827 RL |
57 | for_each_nodebank (i,mi,node) { |
58 | unsigned int pfn1, pfn2; | |
59 | struct page *page, *end; | |
60 | ||
204ecae4 RK |
61 | pfn1 = __phys_to_pfn(mi->bank[i].start); |
62 | pfn2 = __phys_to_pfn(mi->bank[i].size + mi->bank[i].start); | |
5e709827 | 63 | |
204ecae4 RK |
64 | page = map + pfn1; |
65 | end = map + pfn2; | |
5e709827 RL |
66 | |
67 | do { | |
68 | total++; | |
69 | if (PageReserved(page)) | |
70 | reserved++; | |
71 | else if (PageSwapCache(page)) | |
72 | cached++; | |
73 | else if (PageSlab(page)) | |
74 | slab++; | |
75 | else if (!page_count(page)) | |
76 | free++; | |
77 | else | |
78 | shared += page_count(page) - 1; | |
79 | page++; | |
80 | } while (page < end); | |
81 | } | |
1da177e4 LT |
82 | } |
83 | ||
84 | printk("%d pages of RAM\n", total); | |
85 | printk("%d free pages\n", free); | |
86 | printk("%d reserved pages\n", reserved); | |
87 | printk("%d slab pages\n", slab); | |
88 | printk("%d pages shared\n", shared); | |
89 | printk("%d pages swap cached\n", cached); | |
90 | } | |
91 | ||
1da177e4 LT |
92 | /* |
93 | * FIXME: We really want to avoid allocating the bootmap bitmap | |
94 | * over the top of the initrd. Hopefully, this is located towards | |
95 | * the start of a bank, so if we allocate the bootmap bitmap at | |
96 | * the end, we won't clash. | |
97 | */ | |
98 | static unsigned int __init | |
99 | find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) | |
100 | { | |
101 | unsigned int start_pfn, bank, bootmap_pfn; | |
102 | ||
90072059 | 103 | start_pfn = PAGE_ALIGN(__pa(&_end)) >> PAGE_SHIFT; |
1da177e4 LT |
104 | bootmap_pfn = 0; |
105 | ||
90072059 | 106 | for_each_nodebank(bank, mi, node) { |
1da177e4 LT |
107 | unsigned int start, end; |
108 | ||
92a8cbed RK |
109 | start = mi->bank[bank].start >> PAGE_SHIFT; |
110 | end = (mi->bank[bank].size + | |
111 | mi->bank[bank].start) >> PAGE_SHIFT; | |
1da177e4 LT |
112 | |
113 | if (end < start_pfn) | |
114 | continue; | |
115 | ||
116 | if (start < start_pfn) | |
117 | start = start_pfn; | |
118 | ||
119 | if (end <= start) | |
120 | continue; | |
121 | ||
122 | if (end - start >= bootmap_pages) { | |
123 | bootmap_pfn = start; | |
124 | break; | |
125 | } | |
126 | } | |
127 | ||
128 | if (bootmap_pfn == 0) | |
129 | BUG(); | |
130 | ||
131 | return bootmap_pfn; | |
132 | } | |
133 | ||
1da177e4 LT |
134 | static int __init check_initrd(struct meminfo *mi) |
135 | { | |
136 | int initrd_node = -2; | |
137 | #ifdef CONFIG_BLK_DEV_INITRD | |
138 | unsigned long end = phys_initrd_start + phys_initrd_size; | |
139 | ||
140 | /* | |
141 | * Make sure that the initrd is within a valid area of | |
142 | * memory. | |
143 | */ | |
144 | if (phys_initrd_size) { | |
145 | unsigned int i; | |
146 | ||
147 | initrd_node = -1; | |
148 | ||
149 | for (i = 0; i < mi->nr_banks; i++) { | |
150 | unsigned long bank_end; | |
151 | ||
152 | bank_end = mi->bank[i].start + mi->bank[i].size; | |
153 | ||
154 | if (mi->bank[i].start <= phys_initrd_start && | |
155 | end <= bank_end) | |
156 | initrd_node = mi->bank[i].node; | |
157 | } | |
158 | } | |
159 | ||
160 | if (initrd_node == -1) { | |
161 | printk(KERN_ERR "initrd (0x%08lx - 0x%08lx) extends beyond " | |
162 | "physical memory - disabling initrd\n", | |
163 | phys_initrd_start, end); | |
164 | phys_initrd_start = phys_initrd_size = 0; | |
165 | } | |
166 | #endif | |
167 | ||
168 | return initrd_node; | |
169 | } | |
170 | ||
456335e2 RK |
171 | static inline void map_memory_bank(struct membank *bank) |
172 | { | |
d111e8f9 | 173 | #ifdef CONFIG_MMU |
456335e2 RK |
174 | struct map_desc map; |
175 | ||
176 | map.pfn = __phys_to_pfn(bank->start); | |
177 | map.virtual = __phys_to_virt(bank->start); | |
178 | map.length = bank->size; | |
179 | map.type = MT_MEMORY; | |
180 | ||
181 | create_mapping(&map); | |
d111e8f9 | 182 | #endif |
456335e2 RK |
183 | } |
184 | ||
90072059 RK |
185 | static unsigned long __init |
186 | bootmem_init_node(int node, int initrd_node, struct meminfo *mi) | |
1da177e4 | 187 | { |
90072059 RK |
188 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; |
189 | unsigned long start_pfn, end_pfn, boot_pfn; | |
190 | unsigned int boot_pages; | |
191 | pg_data_t *pgdat; | |
192 | int i; | |
1da177e4 | 193 | |
90072059 RK |
194 | start_pfn = -1UL; |
195 | end_pfn = 0; | |
1da177e4 | 196 | |
90072059 RK |
197 | /* |
198 | * Calculate the pfn range, and map the memory banks for this node. | |
199 | */ | |
200 | for_each_nodebank(i, mi, node) { | |
456335e2 | 201 | struct membank *bank = &mi->bank[i]; |
90072059 | 202 | unsigned long start, end; |
1da177e4 | 203 | |
456335e2 RK |
204 | start = bank->start >> PAGE_SHIFT; |
205 | end = (bank->start + bank->size) >> PAGE_SHIFT; | |
1da177e4 | 206 | |
90072059 RK |
207 | if (start_pfn > start) |
208 | start_pfn = start; | |
209 | if (end_pfn < end) | |
210 | end_pfn = end; | |
211 | ||
456335e2 | 212 | map_memory_bank(bank); |
90072059 | 213 | } |
1da177e4 LT |
214 | |
215 | /* | |
90072059 | 216 | * If there is no memory in this node, ignore it. |
1da177e4 | 217 | */ |
90072059 RK |
218 | if (end_pfn == 0) |
219 | return end_pfn; | |
1da177e4 | 220 | |
90072059 RK |
221 | /* |
222 | * Allocate the bootmem bitmap page. | |
223 | */ | |
224 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
225 | boot_pfn = find_bootmap_pfn(node, mi, boot_pages); | |
1da177e4 | 226 | |
90072059 RK |
227 | /* |
228 | * Initialise the bootmem allocator for this node, handing the | |
229 | * memory banks over to bootmem. | |
230 | */ | |
231 | node_set_online(node); | |
232 | pgdat = NODE_DATA(node); | |
233 | init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); | |
1da177e4 | 234 | |
90072059 RK |
235 | for_each_nodebank(i, mi, node) |
236 | free_bootmem_node(pgdat, mi->bank[i].start, mi->bank[i].size); | |
237 | ||
238 | /* | |
239 | * Reserve the bootmem bitmap for this node. | |
240 | */ | |
241 | reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, | |
72a7fe39 | 242 | boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); |
1da177e4 LT |
243 | |
244 | #ifdef CONFIG_BLK_DEV_INITRD | |
90072059 RK |
245 | /* |
246 | * If the initrd is in this node, reserve its memory. | |
247 | */ | |
248 | if (node == initrd_node) { | |
249 | reserve_bootmem_node(pgdat, phys_initrd_start, | |
72a7fe39 | 250 | phys_initrd_size, BOOTMEM_DEFAULT); |
1da177e4 LT |
251 | initrd_start = __phys_to_virt(phys_initrd_start); |
252 | initrd_end = initrd_start + phys_initrd_size; | |
253 | } | |
254 | #endif | |
255 | ||
90072059 RK |
256 | /* |
257 | * Finally, reserve any node zero regions. | |
258 | */ | |
259 | if (node == 0) | |
260 | reserve_node_zero(pgdat); | |
261 | ||
262 | /* | |
263 | * initialise the zones within this node. | |
264 | */ | |
265 | memset(zone_size, 0, sizeof(zone_size)); | |
266 | memset(zhole_size, 0, sizeof(zhole_size)); | |
267 | ||
268 | /* | |
269 | * The size of this node has already been determined. If we need | |
270 | * to do anything fancy with the allocation of this memory to the | |
271 | * zones, now is the time to do it. | |
272 | */ | |
273 | zone_size[0] = end_pfn - start_pfn; | |
274 | ||
275 | /* | |
276 | * For each bank in this node, calculate the size of the holes. | |
277 | * holes = node_size - sum(bank_sizes_in_node) | |
278 | */ | |
279 | zhole_size[0] = zone_size[0]; | |
280 | for_each_nodebank(i, mi, node) | |
281 | zhole_size[0] -= mi->bank[i].size >> PAGE_SHIFT; | |
282 | ||
283 | /* | |
284 | * Adjust the sizes according to any special requirements for | |
285 | * this machine type. | |
286 | */ | |
287 | arch_adjust_zones(node, zone_size, zhole_size); | |
288 | ||
289 | free_area_init_node(node, pgdat, zone_size, start_pfn, zhole_size); | |
290 | ||
291 | return end_pfn; | |
1da177e4 LT |
292 | } |
293 | ||
d111e8f9 | 294 | void __init bootmem_init(struct meminfo *mi) |
1da177e4 | 295 | { |
456335e2 | 296 | unsigned long memend_pfn = 0; |
90072059 | 297 | int node, initrd_node, i; |
1da177e4 | 298 | |
90072059 RK |
299 | /* |
300 | * Invalidate the node number for empty or invalid memory banks | |
301 | */ | |
302 | for (i = 0; i < mi->nr_banks; i++) | |
303 | if (mi->bank[i].size == 0 || mi->bank[i].node >= MAX_NUMNODES) | |
304 | mi->bank[i].node = -1; | |
1da177e4 LT |
305 | |
306 | memcpy(&meminfo, mi, sizeof(meminfo)); | |
307 | ||
1da177e4 | 308 | /* |
90072059 | 309 | * Locate which node contains the ramdisk image, if any. |
1da177e4 | 310 | */ |
90072059 | 311 | initrd_node = check_initrd(mi); |
1da177e4 | 312 | |
90072059 RK |
313 | /* |
314 | * Run through each node initialising the bootmem allocator. | |
315 | */ | |
316 | for_each_node(node) { | |
317 | unsigned long end_pfn; | |
1da177e4 | 318 | |
90072059 | 319 | end_pfn = bootmem_init_node(node, initrd_node, mi); |
1da177e4 LT |
320 | |
321 | /* | |
90072059 | 322 | * Remember the highest memory PFN. |
1da177e4 | 323 | */ |
90072059 RK |
324 | if (end_pfn > memend_pfn) |
325 | memend_pfn = end_pfn; | |
326 | } | |
1da177e4 | 327 | |
90072059 | 328 | high_memory = __va(memend_pfn << PAGE_SHIFT); |
1da177e4 | 329 | |
90072059 RK |
330 | /* |
331 | * This doesn't seem to be used by the Linux memory manager any | |
332 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
333 | * also get rid of some of the stuff above as well. | |
334 | * | |
335 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in | |
336 | * the system, not the maximum PFN. | |
337 | */ | |
338 | max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET; | |
339 | } | |
1da177e4 | 340 | |
1da177e4 LT |
341 | static inline void free_area(unsigned long addr, unsigned long end, char *s) |
342 | { | |
343 | unsigned int size = (end - addr) >> 10; | |
344 | ||
345 | for (; addr < end; addr += PAGE_SIZE) { | |
346 | struct page *page = virt_to_page(addr); | |
347 | ClearPageReserved(page); | |
7835e98b | 348 | init_page_count(page); |
1da177e4 LT |
349 | free_page(addr); |
350 | totalram_pages++; | |
351 | } | |
352 | ||
353 | if (size && s) | |
354 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); | |
355 | } | |
356 | ||
a013053d RK |
357 | static inline void |
358 | free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) | |
359 | { | |
360 | struct page *start_pg, *end_pg; | |
361 | unsigned long pg, pgend; | |
362 | ||
363 | /* | |
364 | * Convert start_pfn/end_pfn to a struct page pointer. | |
365 | */ | |
366 | start_pg = pfn_to_page(start_pfn); | |
367 | end_pg = pfn_to_page(end_pfn); | |
368 | ||
369 | /* | |
370 | * Convert to physical addresses, and | |
371 | * round start upwards and end downwards. | |
372 | */ | |
373 | pg = PAGE_ALIGN(__pa(start_pg)); | |
374 | pgend = __pa(end_pg) & PAGE_MASK; | |
375 | ||
376 | /* | |
377 | * If there are free pages between these, | |
378 | * free the section of the memmap array. | |
379 | */ | |
380 | if (pg < pgend) | |
381 | free_bootmem_node(NODE_DATA(node), pg, pgend - pg); | |
382 | } | |
383 | ||
384 | /* | |
385 | * The mem_map array can get very big. Free the unused area of the memory map. | |
386 | */ | |
387 | static void __init free_unused_memmap_node(int node, struct meminfo *mi) | |
388 | { | |
389 | unsigned long bank_start, prev_bank_end = 0; | |
390 | unsigned int i; | |
391 | ||
392 | /* | |
393 | * [FIXME] This relies on each bank being in address order. This | |
394 | * may not be the case, especially if the user has provided the | |
395 | * information on the command line. | |
396 | */ | |
90072059 | 397 | for_each_nodebank(i, mi, node) { |
a013053d RK |
398 | bank_start = mi->bank[i].start >> PAGE_SHIFT; |
399 | if (bank_start < prev_bank_end) { | |
400 | printk(KERN_ERR "MEM: unordered memory banks. " | |
401 | "Not freeing memmap.\n"); | |
402 | break; | |
403 | } | |
404 | ||
405 | /* | |
406 | * If we had a previous bank, and there is a space | |
407 | * between the current bank and the previous, free it. | |
408 | */ | |
409 | if (prev_bank_end && prev_bank_end != bank_start) | |
410 | free_memmap(node, prev_bank_end, bank_start); | |
411 | ||
412 | prev_bank_end = (mi->bank[i].start + | |
413 | mi->bank[i].size) >> PAGE_SHIFT; | |
414 | } | |
415 | } | |
416 | ||
1da177e4 LT |
417 | /* |
418 | * mem_init() marks the free areas in the mem_map and tells us how much | |
419 | * memory is free. This is done after various parts of the system have | |
420 | * claimed their memory after the kernel image. | |
421 | */ | |
422 | void __init mem_init(void) | |
423 | { | |
424 | unsigned int codepages, datapages, initpages; | |
425 | int i, node; | |
426 | ||
427 | codepages = &_etext - &_text; | |
428 | datapages = &_end - &__data_start; | |
429 | initpages = &__init_end - &__init_begin; | |
430 | ||
431 | #ifndef CONFIG_DISCONTIGMEM | |
432 | max_mapnr = virt_to_page(high_memory) - mem_map; | |
433 | #endif | |
434 | ||
1da177e4 LT |
435 | /* this will put all unused low memory onto the freelists */ |
436 | for_each_online_node(node) { | |
437 | pg_data_t *pgdat = NODE_DATA(node); | |
438 | ||
a013053d RK |
439 | free_unused_memmap_node(node, &meminfo); |
440 | ||
1da177e4 LT |
441 | if (pgdat->node_spanned_pages != 0) |
442 | totalram_pages += free_all_bootmem_node(pgdat); | |
443 | } | |
444 | ||
445 | #ifdef CONFIG_SA1111 | |
446 | /* now that our DMA memory is actually so designated, we can free it */ | |
447 | free_area(PAGE_OFFSET, (unsigned long)swapper_pg_dir, NULL); | |
448 | #endif | |
449 | ||
450 | /* | |
451 | * Since our memory may not be contiguous, calculate the | |
452 | * real number of pages we have in this system | |
453 | */ | |
454 | printk(KERN_INFO "Memory:"); | |
455 | ||
456 | num_physpages = 0; | |
457 | for (i = 0; i < meminfo.nr_banks; i++) { | |
458 | num_physpages += meminfo.bank[i].size >> PAGE_SHIFT; | |
459 | printk(" %ldMB", meminfo.bank[i].size >> 20); | |
460 | } | |
461 | ||
462 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); | |
463 | printk(KERN_NOTICE "Memory: %luKB available (%dK code, " | |
464 | "%dK data, %dK init)\n", | |
465 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
466 | codepages >> 10, datapages >> 10, initpages >> 10); | |
467 | ||
468 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { | |
469 | extern int sysctl_overcommit_memory; | |
470 | /* | |
471 | * On a machine this small we won't get | |
472 | * anywhere without overcommit, so turn | |
473 | * it on by default. | |
474 | */ | |
475 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
476 | } | |
477 | } | |
478 | ||
479 | void free_initmem(void) | |
480 | { | |
481 | if (!machine_is_integrator() && !machine_is_cintegrator()) { | |
482 | free_area((unsigned long)(&__init_begin), | |
483 | (unsigned long)(&__init_end), | |
484 | "init"); | |
485 | } | |
486 | } | |
487 | ||
488 | #ifdef CONFIG_BLK_DEV_INITRD | |
489 | ||
490 | static int keep_initrd; | |
491 | ||
492 | void free_initrd_mem(unsigned long start, unsigned long end) | |
493 | { | |
494 | if (!keep_initrd) | |
495 | free_area(start, end, "initrd"); | |
496 | } | |
497 | ||
498 | static int __init keepinitrd_setup(char *__unused) | |
499 | { | |
500 | keep_initrd = 1; | |
501 | return 1; | |
502 | } | |
503 | ||
504 | __setup("keepinitrd", keepinitrd_setup); | |
505 | #endif |