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> | |
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 | ||
1da177e4 LT |
28 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
29 | ||
30 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
31 | extern void _stext, _text, _etext, __data_start, _end, __init_begin, __init_end; | |
32 | extern unsigned long phys_initrd_start; | |
33 | extern unsigned long phys_initrd_size; | |
34 | ||
35 | /* | |
36 | * The sole use of this is to pass memory configuration | |
37 | * data from paging_init to mem_init. | |
38 | */ | |
39 | static struct meminfo meminfo __initdata = { 0, }; | |
40 | ||
41 | /* | |
42 | * empty_zero_page is a special page that is used for | |
43 | * zero-initialized data and COW. | |
44 | */ | |
45 | struct page *empty_zero_page; | |
46 | ||
47 | void show_mem(void) | |
48 | { | |
49 | int free = 0, total = 0, reserved = 0; | |
50 | int shared = 0, cached = 0, slab = 0, node; | |
51 | ||
52 | printk("Mem-info:\n"); | |
53 | show_free_areas(); | |
54 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
55 | ||
56 | for_each_online_node(node) { | |
57 | struct page *page, *end; | |
58 | ||
59 | page = NODE_MEM_MAP(node); | |
60 | end = page + NODE_DATA(node)->node_spanned_pages; | |
61 | ||
62 | do { | |
63 | total++; | |
64 | if (PageReserved(page)) | |
65 | reserved++; | |
66 | else if (PageSwapCache(page)) | |
67 | cached++; | |
68 | else if (PageSlab(page)) | |
69 | slab++; | |
70 | else if (!page_count(page)) | |
71 | free++; | |
72 | else | |
73 | shared += page_count(page) - 1; | |
74 | page++; | |
75 | } while (page < end); | |
76 | } | |
77 | ||
78 | printk("%d pages of RAM\n", total); | |
79 | printk("%d free pages\n", free); | |
80 | printk("%d reserved pages\n", reserved); | |
81 | printk("%d slab pages\n", slab); | |
82 | printk("%d pages shared\n", shared); | |
83 | printk("%d pages swap cached\n", cached); | |
84 | } | |
85 | ||
90072059 RK |
86 | static inline pmd_t *pmd_off(pgd_t *pgd, unsigned long virt) |
87 | { | |
88 | return pmd_offset(pgd, virt); | |
89 | } | |
90 | ||
91 | static inline pmd_t *pmd_off_k(unsigned long virt) | |
92 | { | |
93 | return pmd_off(pgd_offset_k(virt), virt); | |
94 | } | |
1da177e4 | 95 | |
90072059 RK |
96 | #define for_each_nodebank(iter,mi,no) \ |
97 | for (iter = 0; iter < mi->nr_banks; iter++) \ | |
98 | if (mi->bank[iter].node == no) | |
1da177e4 LT |
99 | |
100 | /* | |
101 | * FIXME: We really want to avoid allocating the bootmap bitmap | |
102 | * over the top of the initrd. Hopefully, this is located towards | |
103 | * the start of a bank, so if we allocate the bootmap bitmap at | |
104 | * the end, we won't clash. | |
105 | */ | |
106 | static unsigned int __init | |
107 | find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) | |
108 | { | |
109 | unsigned int start_pfn, bank, bootmap_pfn; | |
110 | ||
90072059 | 111 | start_pfn = PAGE_ALIGN(__pa(&_end)) >> PAGE_SHIFT; |
1da177e4 LT |
112 | bootmap_pfn = 0; |
113 | ||
90072059 | 114 | for_each_nodebank(bank, mi, node) { |
1da177e4 LT |
115 | unsigned int start, end; |
116 | ||
92a8cbed RK |
117 | start = mi->bank[bank].start >> PAGE_SHIFT; |
118 | end = (mi->bank[bank].size + | |
119 | mi->bank[bank].start) >> PAGE_SHIFT; | |
1da177e4 LT |
120 | |
121 | if (end < start_pfn) | |
122 | continue; | |
123 | ||
124 | if (start < start_pfn) | |
125 | start = start_pfn; | |
126 | ||
127 | if (end <= start) | |
128 | continue; | |
129 | ||
130 | if (end - start >= bootmap_pages) { | |
131 | bootmap_pfn = start; | |
132 | break; | |
133 | } | |
134 | } | |
135 | ||
136 | if (bootmap_pfn == 0) | |
137 | BUG(); | |
138 | ||
139 | return bootmap_pfn; | |
140 | } | |
141 | ||
1da177e4 LT |
142 | static int __init check_initrd(struct meminfo *mi) |
143 | { | |
144 | int initrd_node = -2; | |
145 | #ifdef CONFIG_BLK_DEV_INITRD | |
146 | unsigned long end = phys_initrd_start + phys_initrd_size; | |
147 | ||
148 | /* | |
149 | * Make sure that the initrd is within a valid area of | |
150 | * memory. | |
151 | */ | |
152 | if (phys_initrd_size) { | |
153 | unsigned int i; | |
154 | ||
155 | initrd_node = -1; | |
156 | ||
157 | for (i = 0; i < mi->nr_banks; i++) { | |
158 | unsigned long bank_end; | |
159 | ||
160 | bank_end = mi->bank[i].start + mi->bank[i].size; | |
161 | ||
162 | if (mi->bank[i].start <= phys_initrd_start && | |
163 | end <= bank_end) | |
164 | initrd_node = mi->bank[i].node; | |
165 | } | |
166 | } | |
167 | ||
168 | if (initrd_node == -1) { | |
169 | printk(KERN_ERR "initrd (0x%08lx - 0x%08lx) extends beyond " | |
170 | "physical memory - disabling initrd\n", | |
171 | phys_initrd_start, end); | |
172 | phys_initrd_start = phys_initrd_size = 0; | |
173 | } | |
174 | #endif | |
175 | ||
176 | return initrd_node; | |
177 | } | |
178 | ||
179 | /* | |
180 | * Reserve the various regions of node 0 | |
181 | */ | |
90072059 | 182 | static __init void reserve_node_zero(pg_data_t *pgdat) |
1da177e4 | 183 | { |
1da177e4 LT |
184 | unsigned long res_size = 0; |
185 | ||
186 | /* | |
187 | * Register the kernel text and data with bootmem. | |
188 | * Note that this can only be in node 0. | |
189 | */ | |
190 | #ifdef CONFIG_XIP_KERNEL | |
191 | reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start); | |
192 | #else | |
193 | reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext); | |
194 | #endif | |
195 | ||
196 | /* | |
197 | * Reserve the page tables. These are already in use, | |
198 | * and can only be in node 0. | |
199 | */ | |
200 | reserve_bootmem_node(pgdat, __pa(swapper_pg_dir), | |
201 | PTRS_PER_PGD * sizeof(pgd_t)); | |
202 | ||
1da177e4 LT |
203 | /* |
204 | * Hmm... This should go elsewhere, but we really really need to | |
205 | * stop things allocating the low memory; ideally we need a better | |
206 | * implementation of GFP_DMA which does not assume that DMA-able | |
207 | * memory starts at zero. | |
208 | */ | |
209 | if (machine_is_integrator() || machine_is_cintegrator()) | |
210 | res_size = __pa(swapper_pg_dir) - PHYS_OFFSET; | |
211 | ||
212 | /* | |
213 | * These should likewise go elsewhere. They pre-reserve the | |
214 | * screen memory region at the start of main system memory. | |
215 | */ | |
216 | if (machine_is_edb7211()) | |
217 | res_size = 0x00020000; | |
218 | if (machine_is_p720t()) | |
219 | res_size = 0x00014000; | |
220 | ||
221 | #ifdef CONFIG_SA1111 | |
222 | /* | |
223 | * Because of the SA1111 DMA bug, we want to preserve our | |
224 | * precious DMA-able memory... | |
225 | */ | |
226 | res_size = __pa(swapper_pg_dir) - PHYS_OFFSET; | |
227 | #endif | |
228 | if (res_size) | |
229 | reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size); | |
230 | } | |
231 | ||
90072059 RK |
232 | void __init build_mem_type_table(void); |
233 | void __init create_mapping(struct map_desc *md); | |
234 | ||
235 | static unsigned long __init | |
236 | bootmem_init_node(int node, int initrd_node, struct meminfo *mi) | |
1da177e4 | 237 | { |
90072059 RK |
238 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; |
239 | unsigned long start_pfn, end_pfn, boot_pfn; | |
240 | unsigned int boot_pages; | |
241 | pg_data_t *pgdat; | |
242 | int i; | |
1da177e4 | 243 | |
90072059 RK |
244 | start_pfn = -1UL; |
245 | end_pfn = 0; | |
1da177e4 | 246 | |
90072059 RK |
247 | /* |
248 | * Calculate the pfn range, and map the memory banks for this node. | |
249 | */ | |
250 | for_each_nodebank(i, mi, node) { | |
251 | unsigned long start, end; | |
252 | struct map_desc map; | |
1da177e4 | 253 | |
90072059 RK |
254 | start = mi->bank[i].start >> PAGE_SHIFT; |
255 | end = (mi->bank[i].start + mi->bank[i].size) >> PAGE_SHIFT; | |
1da177e4 | 256 | |
90072059 RK |
257 | if (start_pfn > start) |
258 | start_pfn = start; | |
259 | if (end_pfn < end) | |
260 | end_pfn = end; | |
261 | ||
9769c246 DS |
262 | map.pfn = __phys_to_pfn(mi->bank[i].start); |
263 | map.virtual = __phys_to_virt(mi->bank[i].start); | |
90072059 RK |
264 | map.length = mi->bank[i].size; |
265 | map.type = MT_MEMORY; | |
266 | ||
267 | create_mapping(&map); | |
268 | } | |
1da177e4 LT |
269 | |
270 | /* | |
90072059 | 271 | * If there is no memory in this node, ignore it. |
1da177e4 | 272 | */ |
90072059 RK |
273 | if (end_pfn == 0) |
274 | return end_pfn; | |
1da177e4 | 275 | |
90072059 RK |
276 | /* |
277 | * Allocate the bootmem bitmap page. | |
278 | */ | |
279 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
280 | boot_pfn = find_bootmap_pfn(node, mi, boot_pages); | |
1da177e4 | 281 | |
90072059 RK |
282 | /* |
283 | * Initialise the bootmem allocator for this node, handing the | |
284 | * memory banks over to bootmem. | |
285 | */ | |
286 | node_set_online(node); | |
287 | pgdat = NODE_DATA(node); | |
288 | init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); | |
1da177e4 | 289 | |
90072059 RK |
290 | for_each_nodebank(i, mi, node) |
291 | free_bootmem_node(pgdat, mi->bank[i].start, mi->bank[i].size); | |
292 | ||
293 | /* | |
294 | * Reserve the bootmem bitmap for this node. | |
295 | */ | |
296 | reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, | |
297 | boot_pages << PAGE_SHIFT); | |
1da177e4 LT |
298 | |
299 | #ifdef CONFIG_BLK_DEV_INITRD | |
90072059 RK |
300 | /* |
301 | * If the initrd is in this node, reserve its memory. | |
302 | */ | |
303 | if (node == initrd_node) { | |
304 | reserve_bootmem_node(pgdat, phys_initrd_start, | |
1da177e4 LT |
305 | phys_initrd_size); |
306 | initrd_start = __phys_to_virt(phys_initrd_start); | |
307 | initrd_end = initrd_start + phys_initrd_size; | |
308 | } | |
309 | #endif | |
310 | ||
90072059 RK |
311 | /* |
312 | * Finally, reserve any node zero regions. | |
313 | */ | |
314 | if (node == 0) | |
315 | reserve_node_zero(pgdat); | |
316 | ||
317 | /* | |
318 | * initialise the zones within this node. | |
319 | */ | |
320 | memset(zone_size, 0, sizeof(zone_size)); | |
321 | memset(zhole_size, 0, sizeof(zhole_size)); | |
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 | */ | |
328 | zone_size[0] = end_pfn - start_pfn; | |
329 | ||
330 | /* | |
331 | * For each bank in this node, calculate the size of the holes. | |
332 | * holes = node_size - sum(bank_sizes_in_node) | |
333 | */ | |
334 | zhole_size[0] = zone_size[0]; | |
335 | for_each_nodebank(i, mi, node) | |
336 | zhole_size[0] -= mi->bank[i].size >> PAGE_SHIFT; | |
337 | ||
338 | /* | |
339 | * Adjust the sizes according to any special requirements for | |
340 | * this machine type. | |
341 | */ | |
342 | arch_adjust_zones(node, zone_size, zhole_size); | |
343 | ||
344 | free_area_init_node(node, pgdat, zone_size, start_pfn, zhole_size); | |
345 | ||
346 | return end_pfn; | |
1da177e4 LT |
347 | } |
348 | ||
90072059 | 349 | static void __init bootmem_init(struct meminfo *mi) |
1da177e4 | 350 | { |
90072059 RK |
351 | unsigned long addr, memend_pfn = 0; |
352 | int node, initrd_node, i; | |
1da177e4 | 353 | |
90072059 RK |
354 | /* |
355 | * Invalidate the node number for empty or invalid memory banks | |
356 | */ | |
357 | for (i = 0; i < mi->nr_banks; i++) | |
358 | if (mi->bank[i].size == 0 || mi->bank[i].node >= MAX_NUMNODES) | |
359 | mi->bank[i].node = -1; | |
1da177e4 LT |
360 | |
361 | memcpy(&meminfo, mi, sizeof(meminfo)); | |
362 | ||
363 | /* | |
90072059 | 364 | * Clear out all the mappings below the kernel image. |
1da177e4 | 365 | */ |
1a47ebc0 NP |
366 | for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE) |
367 | pmd_clear(pmd_off_k(addr)); | |
368 | #ifdef CONFIG_XIP_KERNEL | |
369 | /* The XIP kernel is mapped in the module area -- skip over it */ | |
370 | addr = ((unsigned long)&_etext + PGDIR_SIZE - 1) & PGDIR_MASK; | |
371 | #endif | |
372 | for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE) | |
90072059 | 373 | pmd_clear(pmd_off_k(addr)); |
1da177e4 LT |
374 | |
375 | /* | |
90072059 RK |
376 | * Clear out all the kernel space mappings, except for the first |
377 | * memory bank, up to the end of the vmalloc region. | |
1da177e4 | 378 | */ |
90072059 RK |
379 | for (addr = __phys_to_virt(mi->bank[0].start + mi->bank[0].size); |
380 | addr < VMALLOC_END; addr += PGDIR_SIZE) | |
381 | pmd_clear(pmd_off_k(addr)); | |
1da177e4 LT |
382 | |
383 | /* | |
90072059 | 384 | * Locate which node contains the ramdisk image, if any. |
1da177e4 | 385 | */ |
90072059 | 386 | initrd_node = check_initrd(mi); |
1da177e4 | 387 | |
90072059 RK |
388 | /* |
389 | * Run through each node initialising the bootmem allocator. | |
390 | */ | |
391 | for_each_node(node) { | |
392 | unsigned long end_pfn; | |
1da177e4 | 393 | |
90072059 | 394 | end_pfn = bootmem_init_node(node, initrd_node, mi); |
1da177e4 LT |
395 | |
396 | /* | |
90072059 | 397 | * Remember the highest memory PFN. |
1da177e4 | 398 | */ |
90072059 RK |
399 | if (end_pfn > memend_pfn) |
400 | memend_pfn = end_pfn; | |
401 | } | |
1da177e4 | 402 | |
90072059 | 403 | high_memory = __va(memend_pfn << PAGE_SHIFT); |
1da177e4 | 404 | |
90072059 RK |
405 | /* |
406 | * This doesn't seem to be used by the Linux memory manager any | |
407 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
408 | * also get rid of some of the stuff above as well. | |
409 | * | |
410 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in | |
411 | * the system, not the maximum PFN. | |
412 | */ | |
413 | max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET; | |
414 | } | |
1da177e4 | 415 | |
90072059 RK |
416 | /* |
417 | * Set up device the mappings. Since we clear out the page tables for all | |
418 | * mappings above VMALLOC_END, we will remove any debug device mappings. | |
419 | * This means you have to be careful how you debug this function, or any | |
02b30839 RK |
420 | * called function. This means you can't use any function or debugging |
421 | * method which may touch any device, otherwise the kernel _will_ crash. | |
90072059 RK |
422 | */ |
423 | static void __init devicemaps_init(struct machine_desc *mdesc) | |
424 | { | |
425 | struct map_desc map; | |
426 | unsigned long addr; | |
427 | void *vectors; | |
1da177e4 | 428 | |
02b30839 RK |
429 | /* |
430 | * Allocate the vector page early. | |
431 | */ | |
432 | vectors = alloc_bootmem_low_pages(PAGE_SIZE); | |
433 | BUG_ON(!vectors); | |
434 | ||
90072059 RK |
435 | for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE) |
436 | pmd_clear(pmd_off_k(addr)); | |
1da177e4 | 437 | |
1a47ebc0 NP |
438 | /* |
439 | * Map the kernel if it is XIP. | |
440 | * It is always first in the modulearea. | |
441 | */ | |
442 | #ifdef CONFIG_XIP_KERNEL | |
443 | map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & PGDIR_MASK); | |
444 | map.virtual = MODULE_START; | |
445 | map.length = ((unsigned long)&_etext - map.virtual + ~PGDIR_MASK) & PGDIR_MASK; | |
446 | map.type = MT_ROM; | |
447 | create_mapping(&map); | |
448 | #endif | |
449 | ||
90072059 RK |
450 | /* |
451 | * Map the cache flushing regions. | |
452 | */ | |
453 | #ifdef FLUSH_BASE | |
9769c246 | 454 | map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS); |
90072059 | 455 | map.virtual = FLUSH_BASE; |
74d02fb9 | 456 | map.length = SZ_1M; |
90072059 RK |
457 | map.type = MT_CACHECLEAN; |
458 | create_mapping(&map); | |
459 | #endif | |
460 | #ifdef FLUSH_BASE_MINICACHE | |
74d02fb9 | 461 | map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS + SZ_1M); |
90072059 | 462 | map.virtual = FLUSH_BASE_MINICACHE; |
74d02fb9 | 463 | map.length = SZ_1M; |
90072059 RK |
464 | map.type = MT_MINICLEAN; |
465 | create_mapping(&map); | |
466 | #endif | |
467 | ||
90072059 RK |
468 | /* |
469 | * Create a mapping for the machine vectors at the high-vectors | |
470 | * location (0xffff0000). If we aren't using high-vectors, also | |
471 | * create a mapping at the low-vectors virtual address. | |
472 | */ | |
9769c246 | 473 | map.pfn = __phys_to_pfn(virt_to_phys(vectors)); |
90072059 RK |
474 | map.virtual = 0xffff0000; |
475 | map.length = PAGE_SIZE; | |
476 | map.type = MT_HIGH_VECTORS; | |
477 | create_mapping(&map); | |
478 | ||
479 | if (!vectors_high()) { | |
480 | map.virtual = 0; | |
481 | map.type = MT_LOW_VECTORS; | |
482 | create_mapping(&map); | |
1da177e4 LT |
483 | } |
484 | ||
485 | /* | |
90072059 | 486 | * Ask the machine support to map in the statically mapped devices. |
90072059 RK |
487 | */ |
488 | if (mdesc->map_io) | |
489 | mdesc->map_io(); | |
6bf7bd69 RK |
490 | |
491 | /* | |
02b30839 RK |
492 | * Finally flush the caches and tlb to ensure that we're in a |
493 | * consistent state wrt the writebuffer. This also ensures that | |
494 | * any write-allocated cache lines in the vector page are written | |
495 | * back. After this point, we can start to touch devices again. | |
6bf7bd69 RK |
496 | */ |
497 | local_flush_tlb_all(); | |
02b30839 | 498 | flush_cache_all(); |
90072059 RK |
499 | } |
500 | ||
501 | /* | |
502 | * paging_init() sets up the page tables, initialises the zone memory | |
503 | * maps, and sets up the zero page, bad page and bad page tables. | |
504 | */ | |
505 | void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc) | |
506 | { | |
507 | void *zero_page; | |
508 | ||
509 | build_mem_type_table(); | |
510 | bootmem_init(mi); | |
511 | devicemaps_init(mdesc); | |
512 | ||
513 | top_pmd = pmd_off_k(0xffff0000); | |
514 | ||
515 | /* | |
516 | * allocate the zero page. Note that we count on this going ok. | |
1da177e4 | 517 | */ |
90072059 | 518 | zero_page = alloc_bootmem_low_pages(PAGE_SIZE); |
1da177e4 LT |
519 | memzero(zero_page, PAGE_SIZE); |
520 | empty_zero_page = virt_to_page(zero_page); | |
521 | flush_dcache_page(empty_zero_page); | |
522 | } | |
523 | ||
524 | static inline void free_area(unsigned long addr, unsigned long end, char *s) | |
525 | { | |
526 | unsigned int size = (end - addr) >> 10; | |
527 | ||
528 | for (; addr < end; addr += PAGE_SIZE) { | |
529 | struct page *page = virt_to_page(addr); | |
530 | ClearPageReserved(page); | |
7835e98b | 531 | init_page_count(page); |
1da177e4 LT |
532 | free_page(addr); |
533 | totalram_pages++; | |
534 | } | |
535 | ||
536 | if (size && s) | |
537 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); | |
538 | } | |
539 | ||
a013053d RK |
540 | static inline void |
541 | free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) | |
542 | { | |
543 | struct page *start_pg, *end_pg; | |
544 | unsigned long pg, pgend; | |
545 | ||
546 | /* | |
547 | * Convert start_pfn/end_pfn to a struct page pointer. | |
548 | */ | |
549 | start_pg = pfn_to_page(start_pfn); | |
550 | end_pg = pfn_to_page(end_pfn); | |
551 | ||
552 | /* | |
553 | * Convert to physical addresses, and | |
554 | * round start upwards and end downwards. | |
555 | */ | |
556 | pg = PAGE_ALIGN(__pa(start_pg)); | |
557 | pgend = __pa(end_pg) & PAGE_MASK; | |
558 | ||
559 | /* | |
560 | * If there are free pages between these, | |
561 | * free the section of the memmap array. | |
562 | */ | |
563 | if (pg < pgend) | |
564 | free_bootmem_node(NODE_DATA(node), pg, pgend - pg); | |
565 | } | |
566 | ||
567 | /* | |
568 | * The mem_map array can get very big. Free the unused area of the memory map. | |
569 | */ | |
570 | static void __init free_unused_memmap_node(int node, struct meminfo *mi) | |
571 | { | |
572 | unsigned long bank_start, prev_bank_end = 0; | |
573 | unsigned int i; | |
574 | ||
575 | /* | |
576 | * [FIXME] This relies on each bank being in address order. This | |
577 | * may not be the case, especially if the user has provided the | |
578 | * information on the command line. | |
579 | */ | |
90072059 | 580 | for_each_nodebank(i, mi, node) { |
a013053d RK |
581 | bank_start = mi->bank[i].start >> PAGE_SHIFT; |
582 | if (bank_start < prev_bank_end) { | |
583 | printk(KERN_ERR "MEM: unordered memory banks. " | |
584 | "Not freeing memmap.\n"); | |
585 | break; | |
586 | } | |
587 | ||
588 | /* | |
589 | * If we had a previous bank, and there is a space | |
590 | * between the current bank and the previous, free it. | |
591 | */ | |
592 | if (prev_bank_end && prev_bank_end != bank_start) | |
593 | free_memmap(node, prev_bank_end, bank_start); | |
594 | ||
595 | prev_bank_end = (mi->bank[i].start + | |
596 | mi->bank[i].size) >> PAGE_SHIFT; | |
597 | } | |
598 | } | |
599 | ||
1da177e4 LT |
600 | /* |
601 | * mem_init() marks the free areas in the mem_map and tells us how much | |
602 | * memory is free. This is done after various parts of the system have | |
603 | * claimed their memory after the kernel image. | |
604 | */ | |
605 | void __init mem_init(void) | |
606 | { | |
607 | unsigned int codepages, datapages, initpages; | |
608 | int i, node; | |
609 | ||
610 | codepages = &_etext - &_text; | |
611 | datapages = &_end - &__data_start; | |
612 | initpages = &__init_end - &__init_begin; | |
613 | ||
614 | #ifndef CONFIG_DISCONTIGMEM | |
615 | max_mapnr = virt_to_page(high_memory) - mem_map; | |
616 | #endif | |
617 | ||
1da177e4 LT |
618 | /* this will put all unused low memory onto the freelists */ |
619 | for_each_online_node(node) { | |
620 | pg_data_t *pgdat = NODE_DATA(node); | |
621 | ||
a013053d RK |
622 | free_unused_memmap_node(node, &meminfo); |
623 | ||
1da177e4 LT |
624 | if (pgdat->node_spanned_pages != 0) |
625 | totalram_pages += free_all_bootmem_node(pgdat); | |
626 | } | |
627 | ||
628 | #ifdef CONFIG_SA1111 | |
629 | /* now that our DMA memory is actually so designated, we can free it */ | |
630 | free_area(PAGE_OFFSET, (unsigned long)swapper_pg_dir, NULL); | |
631 | #endif | |
632 | ||
633 | /* | |
634 | * Since our memory may not be contiguous, calculate the | |
635 | * real number of pages we have in this system | |
636 | */ | |
637 | printk(KERN_INFO "Memory:"); | |
638 | ||
639 | num_physpages = 0; | |
640 | for (i = 0; i < meminfo.nr_banks; i++) { | |
641 | num_physpages += meminfo.bank[i].size >> PAGE_SHIFT; | |
642 | printk(" %ldMB", meminfo.bank[i].size >> 20); | |
643 | } | |
644 | ||
645 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); | |
646 | printk(KERN_NOTICE "Memory: %luKB available (%dK code, " | |
647 | "%dK data, %dK init)\n", | |
648 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
649 | codepages >> 10, datapages >> 10, initpages >> 10); | |
650 | ||
651 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { | |
652 | extern int sysctl_overcommit_memory; | |
653 | /* | |
654 | * On a machine this small we won't get | |
655 | * anywhere without overcommit, so turn | |
656 | * it on by default. | |
657 | */ | |
658 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
659 | } | |
660 | } | |
661 | ||
662 | void free_initmem(void) | |
663 | { | |
664 | if (!machine_is_integrator() && !machine_is_cintegrator()) { | |
665 | free_area((unsigned long)(&__init_begin), | |
666 | (unsigned long)(&__init_end), | |
667 | "init"); | |
668 | } | |
669 | } | |
670 | ||
671 | #ifdef CONFIG_BLK_DEV_INITRD | |
672 | ||
673 | static int keep_initrd; | |
674 | ||
675 | void free_initrd_mem(unsigned long start, unsigned long end) | |
676 | { | |
677 | if (!keep_initrd) | |
678 | free_area(start, end, "initrd"); | |
679 | } | |
680 | ||
681 | static int __init keepinitrd_setup(char *__unused) | |
682 | { | |
683 | keep_initrd = 1; | |
684 | return 1; | |
685 | } | |
686 | ||
687 | __setup("keepinitrd", keepinitrd_setup); | |
688 | #endif |