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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> | |
12 | #include <linux/ptrace.h> | |
13 | #include <linux/swap.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/bootmem.h> | |
16 | #include <linux/mman.h> | |
17 | #include <linux/nodemask.h> | |
18 | #include <linux/initrd.h> | |
19 | ||
20 | #include <asm/mach-types.h> | |
1da177e4 | 21 | #include <asm/setup.h> |
74d02fb9 | 22 | #include <asm/sizes.h> |
1da177e4 LT |
23 | #include <asm/tlb.h> |
24 | ||
25 | #include <asm/mach/arch.h> | |
26 | #include <asm/mach/map.h> | |
27 | ||
1b2e2b73 RK |
28 | #include "mm.h" |
29 | ||
1da177e4 LT |
30 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
31 | ||
32 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
33 | extern void _stext, _text, _etext, __data_start, _end, __init_begin, __init_end; | |
34 | extern unsigned long phys_initrd_start; | |
35 | extern unsigned long phys_initrd_size; | |
36 | ||
37 | /* | |
38 | * The sole use of this is to pass memory configuration | |
39 | * data from paging_init to mem_init. | |
40 | */ | |
41 | static struct meminfo meminfo __initdata = { 0, }; | |
42 | ||
43 | /* | |
44 | * empty_zero_page is a special page that is used for | |
45 | * zero-initialized data and COW. | |
46 | */ | |
47 | struct page *empty_zero_page; | |
48 | ||
1b2e2b73 RK |
49 | /* |
50 | * The pmd table for the upper-most set of pages. | |
51 | */ | |
52 | pmd_t *top_pmd; | |
53 | ||
1da177e4 LT |
54 | void show_mem(void) |
55 | { | |
56 | int free = 0, total = 0, reserved = 0; | |
57 | int shared = 0, cached = 0, slab = 0, node; | |
58 | ||
59 | printk("Mem-info:\n"); | |
60 | show_free_areas(); | |
61 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
62 | ||
63 | for_each_online_node(node) { | |
64 | struct page *page, *end; | |
65 | ||
66 | page = NODE_MEM_MAP(node); | |
67 | end = page + NODE_DATA(node)->node_spanned_pages; | |
68 | ||
69 | do { | |
70 | total++; | |
71 | if (PageReserved(page)) | |
72 | reserved++; | |
73 | else if (PageSwapCache(page)) | |
74 | cached++; | |
75 | else if (PageSlab(page)) | |
76 | slab++; | |
77 | else if (!page_count(page)) | |
78 | free++; | |
79 | else | |
80 | shared += page_count(page) - 1; | |
81 | page++; | |
82 | } while (page < end); | |
83 | } | |
84 | ||
85 | printk("%d pages of RAM\n", total); | |
86 | printk("%d free pages\n", free); | |
87 | printk("%d reserved pages\n", reserved); | |
88 | printk("%d slab pages\n", slab); | |
89 | printk("%d pages shared\n", shared); | |
90 | printk("%d pages swap cached\n", cached); | |
91 | } | |
92 | ||
90072059 RK |
93 | #define for_each_nodebank(iter,mi,no) \ |
94 | for (iter = 0; iter < mi->nr_banks; iter++) \ | |
95 | if (mi->bank[iter].node == no) | |
1da177e4 LT |
96 | |
97 | /* | |
98 | * FIXME: We really want to avoid allocating the bootmap bitmap | |
99 | * over the top of the initrd. Hopefully, this is located towards | |
100 | * the start of a bank, so if we allocate the bootmap bitmap at | |
101 | * the end, we won't clash. | |
102 | */ | |
103 | static unsigned int __init | |
104 | find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) | |
105 | { | |
106 | unsigned int start_pfn, bank, bootmap_pfn; | |
107 | ||
90072059 | 108 | start_pfn = PAGE_ALIGN(__pa(&_end)) >> PAGE_SHIFT; |
1da177e4 LT |
109 | bootmap_pfn = 0; |
110 | ||
90072059 | 111 | for_each_nodebank(bank, mi, node) { |
1da177e4 LT |
112 | unsigned int start, end; |
113 | ||
92a8cbed RK |
114 | start = mi->bank[bank].start >> PAGE_SHIFT; |
115 | end = (mi->bank[bank].size + | |
116 | mi->bank[bank].start) >> PAGE_SHIFT; | |
1da177e4 LT |
117 | |
118 | if (end < start_pfn) | |
119 | continue; | |
120 | ||
121 | if (start < start_pfn) | |
122 | start = start_pfn; | |
123 | ||
124 | if (end <= start) | |
125 | continue; | |
126 | ||
127 | if (end - start >= bootmap_pages) { | |
128 | bootmap_pfn = start; | |
129 | break; | |
130 | } | |
131 | } | |
132 | ||
133 | if (bootmap_pfn == 0) | |
134 | BUG(); | |
135 | ||
136 | return bootmap_pfn; | |
137 | } | |
138 | ||
1da177e4 LT |
139 | static int __init check_initrd(struct meminfo *mi) |
140 | { | |
141 | int initrd_node = -2; | |
142 | #ifdef CONFIG_BLK_DEV_INITRD | |
143 | unsigned long end = phys_initrd_start + phys_initrd_size; | |
144 | ||
145 | /* | |
146 | * Make sure that the initrd is within a valid area of | |
147 | * memory. | |
148 | */ | |
149 | if (phys_initrd_size) { | |
150 | unsigned int i; | |
151 | ||
152 | initrd_node = -1; | |
153 | ||
154 | for (i = 0; i < mi->nr_banks; i++) { | |
155 | unsigned long bank_end; | |
156 | ||
157 | bank_end = mi->bank[i].start + mi->bank[i].size; | |
158 | ||
159 | if (mi->bank[i].start <= phys_initrd_start && | |
160 | end <= bank_end) | |
161 | initrd_node = mi->bank[i].node; | |
162 | } | |
163 | } | |
164 | ||
165 | if (initrd_node == -1) { | |
166 | printk(KERN_ERR "initrd (0x%08lx - 0x%08lx) extends beyond " | |
167 | "physical memory - disabling initrd\n", | |
168 | phys_initrd_start, end); | |
169 | phys_initrd_start = phys_initrd_size = 0; | |
170 | } | |
171 | #endif | |
172 | ||
173 | return initrd_node; | |
174 | } | |
175 | ||
176 | /* | |
177 | * Reserve the various regions of node 0 | |
178 | */ | |
90072059 | 179 | static __init void reserve_node_zero(pg_data_t *pgdat) |
1da177e4 | 180 | { |
1da177e4 LT |
181 | unsigned long res_size = 0; |
182 | ||
183 | /* | |
184 | * Register the kernel text and data with bootmem. | |
185 | * Note that this can only be in node 0. | |
186 | */ | |
187 | #ifdef CONFIG_XIP_KERNEL | |
188 | reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start); | |
189 | #else | |
190 | reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext); | |
191 | #endif | |
192 | ||
193 | /* | |
194 | * Reserve the page tables. These are already in use, | |
195 | * and can only be in node 0. | |
196 | */ | |
197 | reserve_bootmem_node(pgdat, __pa(swapper_pg_dir), | |
198 | PTRS_PER_PGD * sizeof(pgd_t)); | |
199 | ||
1da177e4 LT |
200 | /* |
201 | * Hmm... This should go elsewhere, but we really really need to | |
202 | * stop things allocating the low memory; ideally we need a better | |
203 | * implementation of GFP_DMA which does not assume that DMA-able | |
204 | * memory starts at zero. | |
205 | */ | |
206 | if (machine_is_integrator() || machine_is_cintegrator()) | |
207 | res_size = __pa(swapper_pg_dir) - PHYS_OFFSET; | |
208 | ||
209 | /* | |
210 | * These should likewise go elsewhere. They pre-reserve the | |
211 | * screen memory region at the start of main system memory. | |
212 | */ | |
213 | if (machine_is_edb7211()) | |
214 | res_size = 0x00020000; | |
215 | if (machine_is_p720t()) | |
216 | res_size = 0x00014000; | |
217 | ||
218 | #ifdef CONFIG_SA1111 | |
219 | /* | |
220 | * Because of the SA1111 DMA bug, we want to preserve our | |
221 | * precious DMA-able memory... | |
222 | */ | |
223 | res_size = __pa(swapper_pg_dir) - PHYS_OFFSET; | |
224 | #endif | |
225 | if (res_size) | |
226 | reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size); | |
227 | } | |
228 | ||
90072059 RK |
229 | static unsigned long __init |
230 | bootmem_init_node(int node, int initrd_node, struct meminfo *mi) | |
1da177e4 | 231 | { |
90072059 RK |
232 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; |
233 | unsigned long start_pfn, end_pfn, boot_pfn; | |
234 | unsigned int boot_pages; | |
235 | pg_data_t *pgdat; | |
236 | int i; | |
1da177e4 | 237 | |
90072059 RK |
238 | start_pfn = -1UL; |
239 | end_pfn = 0; | |
1da177e4 | 240 | |
90072059 RK |
241 | /* |
242 | * Calculate the pfn range, and map the memory banks for this node. | |
243 | */ | |
244 | for_each_nodebank(i, mi, node) { | |
245 | unsigned long start, end; | |
246 | struct map_desc map; | |
1da177e4 | 247 | |
90072059 RK |
248 | start = mi->bank[i].start >> PAGE_SHIFT; |
249 | end = (mi->bank[i].start + mi->bank[i].size) >> PAGE_SHIFT; | |
1da177e4 | 250 | |
90072059 RK |
251 | if (start_pfn > start) |
252 | start_pfn = start; | |
253 | if (end_pfn < end) | |
254 | end_pfn = end; | |
255 | ||
9769c246 DS |
256 | map.pfn = __phys_to_pfn(mi->bank[i].start); |
257 | map.virtual = __phys_to_virt(mi->bank[i].start); | |
90072059 RK |
258 | map.length = mi->bank[i].size; |
259 | map.type = MT_MEMORY; | |
260 | ||
261 | create_mapping(&map); | |
262 | } | |
1da177e4 LT |
263 | |
264 | /* | |
90072059 | 265 | * If there is no memory in this node, ignore it. |
1da177e4 | 266 | */ |
90072059 RK |
267 | if (end_pfn == 0) |
268 | return end_pfn; | |
1da177e4 | 269 | |
90072059 RK |
270 | /* |
271 | * Allocate the bootmem bitmap page. | |
272 | */ | |
273 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
274 | boot_pfn = find_bootmap_pfn(node, mi, boot_pages); | |
1da177e4 | 275 | |
90072059 RK |
276 | /* |
277 | * Initialise the bootmem allocator for this node, handing the | |
278 | * memory banks over to bootmem. | |
279 | */ | |
280 | node_set_online(node); | |
281 | pgdat = NODE_DATA(node); | |
282 | init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); | |
1da177e4 | 283 | |
90072059 RK |
284 | for_each_nodebank(i, mi, node) |
285 | free_bootmem_node(pgdat, mi->bank[i].start, mi->bank[i].size); | |
286 | ||
287 | /* | |
288 | * Reserve the bootmem bitmap for this node. | |
289 | */ | |
290 | reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, | |
291 | boot_pages << PAGE_SHIFT); | |
1da177e4 LT |
292 | |
293 | #ifdef CONFIG_BLK_DEV_INITRD | |
90072059 RK |
294 | /* |
295 | * If the initrd is in this node, reserve its memory. | |
296 | */ | |
297 | if (node == initrd_node) { | |
298 | reserve_bootmem_node(pgdat, phys_initrd_start, | |
1da177e4 LT |
299 | phys_initrd_size); |
300 | initrd_start = __phys_to_virt(phys_initrd_start); | |
301 | initrd_end = initrd_start + phys_initrd_size; | |
302 | } | |
303 | #endif | |
304 | ||
90072059 RK |
305 | /* |
306 | * Finally, reserve any node zero regions. | |
307 | */ | |
308 | if (node == 0) | |
309 | reserve_node_zero(pgdat); | |
310 | ||
311 | /* | |
312 | * initialise the zones within this node. | |
313 | */ | |
314 | memset(zone_size, 0, sizeof(zone_size)); | |
315 | memset(zhole_size, 0, sizeof(zhole_size)); | |
316 | ||
317 | /* | |
318 | * The size of this node has already been determined. If we need | |
319 | * to do anything fancy with the allocation of this memory to the | |
320 | * zones, now is the time to do it. | |
321 | */ | |
322 | zone_size[0] = end_pfn - start_pfn; | |
323 | ||
324 | /* | |
325 | * For each bank in this node, calculate the size of the holes. | |
326 | * holes = node_size - sum(bank_sizes_in_node) | |
327 | */ | |
328 | zhole_size[0] = zone_size[0]; | |
329 | for_each_nodebank(i, mi, node) | |
330 | zhole_size[0] -= mi->bank[i].size >> PAGE_SHIFT; | |
331 | ||
332 | /* | |
333 | * Adjust the sizes according to any special requirements for | |
334 | * this machine type. | |
335 | */ | |
336 | arch_adjust_zones(node, zone_size, zhole_size); | |
337 | ||
338 | free_area_init_node(node, pgdat, zone_size, start_pfn, zhole_size); | |
339 | ||
340 | return end_pfn; | |
1da177e4 LT |
341 | } |
342 | ||
90072059 | 343 | static void __init bootmem_init(struct meminfo *mi) |
1da177e4 | 344 | { |
90072059 RK |
345 | unsigned long addr, memend_pfn = 0; |
346 | int node, initrd_node, i; | |
1da177e4 | 347 | |
90072059 RK |
348 | /* |
349 | * Invalidate the node number for empty or invalid memory banks | |
350 | */ | |
351 | for (i = 0; i < mi->nr_banks; i++) | |
352 | if (mi->bank[i].size == 0 || mi->bank[i].node >= MAX_NUMNODES) | |
353 | mi->bank[i].node = -1; | |
1da177e4 LT |
354 | |
355 | memcpy(&meminfo, mi, sizeof(meminfo)); | |
356 | ||
357 | /* | |
90072059 | 358 | * Clear out all the mappings below the kernel image. |
1da177e4 | 359 | */ |
1a47ebc0 NP |
360 | for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE) |
361 | pmd_clear(pmd_off_k(addr)); | |
362 | #ifdef CONFIG_XIP_KERNEL | |
363 | /* The XIP kernel is mapped in the module area -- skip over it */ | |
364 | addr = ((unsigned long)&_etext + PGDIR_SIZE - 1) & PGDIR_MASK; | |
365 | #endif | |
366 | for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE) | |
90072059 | 367 | pmd_clear(pmd_off_k(addr)); |
1da177e4 LT |
368 | |
369 | /* | |
90072059 RK |
370 | * Clear out all the kernel space mappings, except for the first |
371 | * memory bank, up to the end of the vmalloc region. | |
1da177e4 | 372 | */ |
90072059 RK |
373 | for (addr = __phys_to_virt(mi->bank[0].start + mi->bank[0].size); |
374 | addr < VMALLOC_END; addr += PGDIR_SIZE) | |
375 | pmd_clear(pmd_off_k(addr)); | |
1da177e4 LT |
376 | |
377 | /* | |
90072059 | 378 | * Locate which node contains the ramdisk image, if any. |
1da177e4 | 379 | */ |
90072059 | 380 | initrd_node = check_initrd(mi); |
1da177e4 | 381 | |
90072059 RK |
382 | /* |
383 | * Run through each node initialising the bootmem allocator. | |
384 | */ | |
385 | for_each_node(node) { | |
386 | unsigned long end_pfn; | |
1da177e4 | 387 | |
90072059 | 388 | end_pfn = bootmem_init_node(node, initrd_node, mi); |
1da177e4 LT |
389 | |
390 | /* | |
90072059 | 391 | * Remember the highest memory PFN. |
1da177e4 | 392 | */ |
90072059 RK |
393 | if (end_pfn > memend_pfn) |
394 | memend_pfn = end_pfn; | |
395 | } | |
1da177e4 | 396 | |
90072059 | 397 | high_memory = __va(memend_pfn << PAGE_SHIFT); |
1da177e4 | 398 | |
90072059 RK |
399 | /* |
400 | * This doesn't seem to be used by the Linux memory manager any | |
401 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
402 | * also get rid of some of the stuff above as well. | |
403 | * | |
404 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in | |
405 | * the system, not the maximum PFN. | |
406 | */ | |
407 | max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET; | |
408 | } | |
1da177e4 | 409 | |
90072059 RK |
410 | /* |
411 | * Set up device the mappings. Since we clear out the page tables for all | |
412 | * mappings above VMALLOC_END, we will remove any debug device mappings. | |
413 | * This means you have to be careful how you debug this function, or any | |
02b30839 RK |
414 | * called function. This means you can't use any function or debugging |
415 | * method which may touch any device, otherwise the kernel _will_ crash. | |
90072059 RK |
416 | */ |
417 | static void __init devicemaps_init(struct machine_desc *mdesc) | |
418 | { | |
419 | struct map_desc map; | |
420 | unsigned long addr; | |
421 | void *vectors; | |
1da177e4 | 422 | |
02b30839 RK |
423 | /* |
424 | * Allocate the vector page early. | |
425 | */ | |
426 | vectors = alloc_bootmem_low_pages(PAGE_SIZE); | |
427 | BUG_ON(!vectors); | |
428 | ||
90072059 RK |
429 | for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE) |
430 | pmd_clear(pmd_off_k(addr)); | |
1da177e4 | 431 | |
1a47ebc0 NP |
432 | /* |
433 | * Map the kernel if it is XIP. | |
434 | * It is always first in the modulearea. | |
435 | */ | |
436 | #ifdef CONFIG_XIP_KERNEL | |
4052ebb7 | 437 | map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & SECTION_MASK); |
1a47ebc0 | 438 | map.virtual = MODULE_START; |
4052ebb7 | 439 | map.length = ((unsigned long)&_etext - map.virtual + ~SECTION_MASK) & SECTION_MASK; |
1a47ebc0 NP |
440 | map.type = MT_ROM; |
441 | create_mapping(&map); | |
442 | #endif | |
443 | ||
90072059 RK |
444 | /* |
445 | * Map the cache flushing regions. | |
446 | */ | |
447 | #ifdef FLUSH_BASE | |
9769c246 | 448 | map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS); |
90072059 | 449 | map.virtual = FLUSH_BASE; |
74d02fb9 | 450 | map.length = SZ_1M; |
90072059 RK |
451 | map.type = MT_CACHECLEAN; |
452 | create_mapping(&map); | |
453 | #endif | |
454 | #ifdef FLUSH_BASE_MINICACHE | |
74d02fb9 | 455 | map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS + SZ_1M); |
90072059 | 456 | map.virtual = FLUSH_BASE_MINICACHE; |
74d02fb9 | 457 | map.length = SZ_1M; |
90072059 RK |
458 | map.type = MT_MINICLEAN; |
459 | create_mapping(&map); | |
460 | #endif | |
461 | ||
90072059 RK |
462 | /* |
463 | * Create a mapping for the machine vectors at the high-vectors | |
464 | * location (0xffff0000). If we aren't using high-vectors, also | |
465 | * create a mapping at the low-vectors virtual address. | |
466 | */ | |
9769c246 | 467 | map.pfn = __phys_to_pfn(virt_to_phys(vectors)); |
90072059 RK |
468 | map.virtual = 0xffff0000; |
469 | map.length = PAGE_SIZE; | |
470 | map.type = MT_HIGH_VECTORS; | |
471 | create_mapping(&map); | |
472 | ||
473 | if (!vectors_high()) { | |
474 | map.virtual = 0; | |
475 | map.type = MT_LOW_VECTORS; | |
476 | create_mapping(&map); | |
1da177e4 LT |
477 | } |
478 | ||
479 | /* | |
90072059 | 480 | * Ask the machine support to map in the statically mapped devices. |
90072059 RK |
481 | */ |
482 | if (mdesc->map_io) | |
483 | mdesc->map_io(); | |
6bf7bd69 RK |
484 | |
485 | /* | |
02b30839 RK |
486 | * Finally flush the caches and tlb to ensure that we're in a |
487 | * consistent state wrt the writebuffer. This also ensures that | |
488 | * any write-allocated cache lines in the vector page are written | |
489 | * back. After this point, we can start to touch devices again. | |
6bf7bd69 RK |
490 | */ |
491 | local_flush_tlb_all(); | |
02b30839 | 492 | flush_cache_all(); |
90072059 RK |
493 | } |
494 | ||
495 | /* | |
496 | * paging_init() sets up the page tables, initialises the zone memory | |
497 | * maps, and sets up the zero page, bad page and bad page tables. | |
498 | */ | |
499 | void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc) | |
500 | { | |
501 | void *zero_page; | |
502 | ||
503 | build_mem_type_table(); | |
504 | bootmem_init(mi); | |
505 | devicemaps_init(mdesc); | |
506 | ||
507 | top_pmd = pmd_off_k(0xffff0000); | |
508 | ||
509 | /* | |
510 | * allocate the zero page. Note that we count on this going ok. | |
1da177e4 | 511 | */ |
90072059 | 512 | zero_page = alloc_bootmem_low_pages(PAGE_SIZE); |
1da177e4 LT |
513 | memzero(zero_page, PAGE_SIZE); |
514 | empty_zero_page = virt_to_page(zero_page); | |
515 | flush_dcache_page(empty_zero_page); | |
516 | } | |
517 | ||
518 | static inline void free_area(unsigned long addr, unsigned long end, char *s) | |
519 | { | |
520 | unsigned int size = (end - addr) >> 10; | |
521 | ||
522 | for (; addr < end; addr += PAGE_SIZE) { | |
523 | struct page *page = virt_to_page(addr); | |
524 | ClearPageReserved(page); | |
7835e98b | 525 | init_page_count(page); |
1da177e4 LT |
526 | free_page(addr); |
527 | totalram_pages++; | |
528 | } | |
529 | ||
530 | if (size && s) | |
531 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); | |
532 | } | |
533 | ||
a013053d RK |
534 | static inline void |
535 | free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) | |
536 | { | |
537 | struct page *start_pg, *end_pg; | |
538 | unsigned long pg, pgend; | |
539 | ||
540 | /* | |
541 | * Convert start_pfn/end_pfn to a struct page pointer. | |
542 | */ | |
543 | start_pg = pfn_to_page(start_pfn); | |
544 | end_pg = pfn_to_page(end_pfn); | |
545 | ||
546 | /* | |
547 | * Convert to physical addresses, and | |
548 | * round start upwards and end downwards. | |
549 | */ | |
550 | pg = PAGE_ALIGN(__pa(start_pg)); | |
551 | pgend = __pa(end_pg) & PAGE_MASK; | |
552 | ||
553 | /* | |
554 | * If there are free pages between these, | |
555 | * free the section of the memmap array. | |
556 | */ | |
557 | if (pg < pgend) | |
558 | free_bootmem_node(NODE_DATA(node), pg, pgend - pg); | |
559 | } | |
560 | ||
561 | /* | |
562 | * The mem_map array can get very big. Free the unused area of the memory map. | |
563 | */ | |
564 | static void __init free_unused_memmap_node(int node, struct meminfo *mi) | |
565 | { | |
566 | unsigned long bank_start, prev_bank_end = 0; | |
567 | unsigned int i; | |
568 | ||
569 | /* | |
570 | * [FIXME] This relies on each bank being in address order. This | |
571 | * may not be the case, especially if the user has provided the | |
572 | * information on the command line. | |
573 | */ | |
90072059 | 574 | for_each_nodebank(i, mi, node) { |
a013053d RK |
575 | bank_start = mi->bank[i].start >> PAGE_SHIFT; |
576 | if (bank_start < prev_bank_end) { | |
577 | printk(KERN_ERR "MEM: unordered memory banks. " | |
578 | "Not freeing memmap.\n"); | |
579 | break; | |
580 | } | |
581 | ||
582 | /* | |
583 | * If we had a previous bank, and there is a space | |
584 | * between the current bank and the previous, free it. | |
585 | */ | |
586 | if (prev_bank_end && prev_bank_end != bank_start) | |
587 | free_memmap(node, prev_bank_end, bank_start); | |
588 | ||
589 | prev_bank_end = (mi->bank[i].start + | |
590 | mi->bank[i].size) >> PAGE_SHIFT; | |
591 | } | |
592 | } | |
593 | ||
1da177e4 LT |
594 | /* |
595 | * mem_init() marks the free areas in the mem_map and tells us how much | |
596 | * memory is free. This is done after various parts of the system have | |
597 | * claimed their memory after the kernel image. | |
598 | */ | |
599 | void __init mem_init(void) | |
600 | { | |
601 | unsigned int codepages, datapages, initpages; | |
602 | int i, node; | |
603 | ||
604 | codepages = &_etext - &_text; | |
605 | datapages = &_end - &__data_start; | |
606 | initpages = &__init_end - &__init_begin; | |
607 | ||
608 | #ifndef CONFIG_DISCONTIGMEM | |
609 | max_mapnr = virt_to_page(high_memory) - mem_map; | |
610 | #endif | |
611 | ||
1da177e4 LT |
612 | /* this will put all unused low memory onto the freelists */ |
613 | for_each_online_node(node) { | |
614 | pg_data_t *pgdat = NODE_DATA(node); | |
615 | ||
a013053d RK |
616 | free_unused_memmap_node(node, &meminfo); |
617 | ||
1da177e4 LT |
618 | if (pgdat->node_spanned_pages != 0) |
619 | totalram_pages += free_all_bootmem_node(pgdat); | |
620 | } | |
621 | ||
622 | #ifdef CONFIG_SA1111 | |
623 | /* now that our DMA memory is actually so designated, we can free it */ | |
624 | free_area(PAGE_OFFSET, (unsigned long)swapper_pg_dir, NULL); | |
625 | #endif | |
626 | ||
627 | /* | |
628 | * Since our memory may not be contiguous, calculate the | |
629 | * real number of pages we have in this system | |
630 | */ | |
631 | printk(KERN_INFO "Memory:"); | |
632 | ||
633 | num_physpages = 0; | |
634 | for (i = 0; i < meminfo.nr_banks; i++) { | |
635 | num_physpages += meminfo.bank[i].size >> PAGE_SHIFT; | |
636 | printk(" %ldMB", meminfo.bank[i].size >> 20); | |
637 | } | |
638 | ||
639 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); | |
640 | printk(KERN_NOTICE "Memory: %luKB available (%dK code, " | |
641 | "%dK data, %dK init)\n", | |
642 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
643 | codepages >> 10, datapages >> 10, initpages >> 10); | |
644 | ||
645 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { | |
646 | extern int sysctl_overcommit_memory; | |
647 | /* | |
648 | * On a machine this small we won't get | |
649 | * anywhere without overcommit, so turn | |
650 | * it on by default. | |
651 | */ | |
652 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
653 | } | |
654 | } | |
655 | ||
656 | void free_initmem(void) | |
657 | { | |
658 | if (!machine_is_integrator() && !machine_is_cintegrator()) { | |
659 | free_area((unsigned long)(&__init_begin), | |
660 | (unsigned long)(&__init_end), | |
661 | "init"); | |
662 | } | |
663 | } | |
664 | ||
665 | #ifdef CONFIG_BLK_DEV_INITRD | |
666 | ||
667 | static int keep_initrd; | |
668 | ||
669 | void free_initrd_mem(unsigned long start, unsigned long end) | |
670 | { | |
671 | if (!keep_initrd) | |
672 | free_area(start, end, "initrd"); | |
673 | } | |
674 | ||
675 | static int __init keepinitrd_setup(char *__unused) | |
676 | { | |
677 | keep_initrd = 1; | |
678 | return 1; | |
679 | } | |
680 | ||
681 | __setup("keepinitrd", keepinitrd_setup); | |
682 | #endif |