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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 | */ | |
10 | #include <linux/config.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/ptrace.h> | |
14 | #include <linux/swap.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/bootmem.h> | |
17 | #include <linux/mman.h> | |
18 | #include <linux/nodemask.h> | |
19 | #include <linux/initrd.h> | |
20 | ||
21 | #include <asm/mach-types.h> | |
22 | #include <asm/hardware.h> | |
23 | #include <asm/setup.h> | |
24 | #include <asm/tlb.h> | |
25 | ||
26 | #include <asm/mach/arch.h> | |
27 | #include <asm/mach/map.h> | |
28 | ||
29 | #define TABLE_SIZE (2 * PTRS_PER_PTE * sizeof(pte_t)) | |
30 | ||
31 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
32 | ||
33 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
34 | extern void _stext, _text, _etext, __data_start, _end, __init_begin, __init_end; | |
35 | extern unsigned long phys_initrd_start; | |
36 | extern unsigned long phys_initrd_size; | |
37 | ||
38 | /* | |
39 | * The sole use of this is to pass memory configuration | |
40 | * data from paging_init to mem_init. | |
41 | */ | |
42 | static struct meminfo meminfo __initdata = { 0, }; | |
43 | ||
44 | /* | |
45 | * empty_zero_page is a special page that is used for | |
46 | * zero-initialized data and COW. | |
47 | */ | |
48 | struct page *empty_zero_page; | |
49 | ||
50 | void show_mem(void) | |
51 | { | |
52 | int free = 0, total = 0, reserved = 0; | |
53 | int shared = 0, cached = 0, slab = 0, node; | |
54 | ||
55 | printk("Mem-info:\n"); | |
56 | show_free_areas(); | |
57 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
58 | ||
59 | for_each_online_node(node) { | |
60 | struct page *page, *end; | |
61 | ||
62 | page = NODE_MEM_MAP(node); | |
63 | end = page + NODE_DATA(node)->node_spanned_pages; | |
64 | ||
65 | do { | |
66 | total++; | |
67 | if (PageReserved(page)) | |
68 | reserved++; | |
69 | else if (PageSwapCache(page)) | |
70 | cached++; | |
71 | else if (PageSlab(page)) | |
72 | slab++; | |
73 | else if (!page_count(page)) | |
74 | free++; | |
75 | else | |
76 | shared += page_count(page) - 1; | |
77 | page++; | |
78 | } while (page < end); | |
79 | } | |
80 | ||
81 | printk("%d pages of RAM\n", total); | |
82 | printk("%d free pages\n", free); | |
83 | printk("%d reserved pages\n", reserved); | |
84 | printk("%d slab pages\n", slab); | |
85 | printk("%d pages shared\n", shared); | |
86 | printk("%d pages swap cached\n", cached); | |
87 | } | |
88 | ||
90072059 RK |
89 | static inline pmd_t *pmd_off(pgd_t *pgd, unsigned long virt) |
90 | { | |
91 | return pmd_offset(pgd, virt); | |
92 | } | |
93 | ||
94 | static inline pmd_t *pmd_off_k(unsigned long virt) | |
95 | { | |
96 | return pmd_off(pgd_offset_k(virt), virt); | |
97 | } | |
1da177e4 | 98 | |
90072059 RK |
99 | #define for_each_nodebank(iter,mi,no) \ |
100 | for (iter = 0; iter < mi->nr_banks; iter++) \ | |
101 | if (mi->bank[iter].node == no) | |
1da177e4 LT |
102 | |
103 | /* | |
104 | * FIXME: We really want to avoid allocating the bootmap bitmap | |
105 | * over the top of the initrd. Hopefully, this is located towards | |
106 | * the start of a bank, so if we allocate the bootmap bitmap at | |
107 | * the end, we won't clash. | |
108 | */ | |
109 | static unsigned int __init | |
110 | find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) | |
111 | { | |
112 | unsigned int start_pfn, bank, bootmap_pfn; | |
113 | ||
90072059 | 114 | start_pfn = PAGE_ALIGN(__pa(&_end)) >> PAGE_SHIFT; |
1da177e4 LT |
115 | bootmap_pfn = 0; |
116 | ||
90072059 | 117 | for_each_nodebank(bank, mi, node) { |
1da177e4 LT |
118 | unsigned int start, end; |
119 | ||
92a8cbed RK |
120 | start = mi->bank[bank].start >> PAGE_SHIFT; |
121 | end = (mi->bank[bank].size + | |
122 | mi->bank[bank].start) >> PAGE_SHIFT; | |
1da177e4 LT |
123 | |
124 | if (end < start_pfn) | |
125 | continue; | |
126 | ||
127 | if (start < start_pfn) | |
128 | start = start_pfn; | |
129 | ||
130 | if (end <= start) | |
131 | continue; | |
132 | ||
133 | if (end - start >= bootmap_pages) { | |
134 | bootmap_pfn = start; | |
135 | break; | |
136 | } | |
137 | } | |
138 | ||
139 | if (bootmap_pfn == 0) | |
140 | BUG(); | |
141 | ||
142 | return bootmap_pfn; | |
143 | } | |
144 | ||
1da177e4 LT |
145 | static int __init check_initrd(struct meminfo *mi) |
146 | { | |
147 | int initrd_node = -2; | |
148 | #ifdef CONFIG_BLK_DEV_INITRD | |
149 | unsigned long end = phys_initrd_start + phys_initrd_size; | |
150 | ||
151 | /* | |
152 | * Make sure that the initrd is within a valid area of | |
153 | * memory. | |
154 | */ | |
155 | if (phys_initrd_size) { | |
156 | unsigned int i; | |
157 | ||
158 | initrd_node = -1; | |
159 | ||
160 | for (i = 0; i < mi->nr_banks; i++) { | |
161 | unsigned long bank_end; | |
162 | ||
163 | bank_end = mi->bank[i].start + mi->bank[i].size; | |
164 | ||
165 | if (mi->bank[i].start <= phys_initrd_start && | |
166 | end <= bank_end) | |
167 | initrd_node = mi->bank[i].node; | |
168 | } | |
169 | } | |
170 | ||
171 | if (initrd_node == -1) { | |
172 | printk(KERN_ERR "initrd (0x%08lx - 0x%08lx) extends beyond " | |
173 | "physical memory - disabling initrd\n", | |
174 | phys_initrd_start, end); | |
175 | phys_initrd_start = phys_initrd_size = 0; | |
176 | } | |
177 | #endif | |
178 | ||
179 | return initrd_node; | |
180 | } | |
181 | ||
182 | /* | |
183 | * Reserve the various regions of node 0 | |
184 | */ | |
90072059 | 185 | static __init void reserve_node_zero(pg_data_t *pgdat) |
1da177e4 | 186 | { |
1da177e4 LT |
187 | unsigned long res_size = 0; |
188 | ||
189 | /* | |
190 | * Register the kernel text and data with bootmem. | |
191 | * Note that this can only be in node 0. | |
192 | */ | |
193 | #ifdef CONFIG_XIP_KERNEL | |
194 | reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start); | |
195 | #else | |
196 | reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext); | |
197 | #endif | |
198 | ||
199 | /* | |
200 | * Reserve the page tables. These are already in use, | |
201 | * and can only be in node 0. | |
202 | */ | |
203 | reserve_bootmem_node(pgdat, __pa(swapper_pg_dir), | |
204 | PTRS_PER_PGD * sizeof(pgd_t)); | |
205 | ||
1da177e4 LT |
206 | /* |
207 | * Hmm... This should go elsewhere, but we really really need to | |
208 | * stop things allocating the low memory; ideally we need a better | |
209 | * implementation of GFP_DMA which does not assume that DMA-able | |
210 | * memory starts at zero. | |
211 | */ | |
212 | if (machine_is_integrator() || machine_is_cintegrator()) | |
213 | res_size = __pa(swapper_pg_dir) - PHYS_OFFSET; | |
214 | ||
215 | /* | |
216 | * These should likewise go elsewhere. They pre-reserve the | |
217 | * screen memory region at the start of main system memory. | |
218 | */ | |
219 | if (machine_is_edb7211()) | |
220 | res_size = 0x00020000; | |
221 | if (machine_is_p720t()) | |
222 | res_size = 0x00014000; | |
223 | ||
224 | #ifdef CONFIG_SA1111 | |
225 | /* | |
226 | * Because of the SA1111 DMA bug, we want to preserve our | |
227 | * precious DMA-able memory... | |
228 | */ | |
229 | res_size = __pa(swapper_pg_dir) - PHYS_OFFSET; | |
230 | #endif | |
231 | if (res_size) | |
232 | reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size); | |
233 | } | |
234 | ||
90072059 RK |
235 | void __init build_mem_type_table(void); |
236 | void __init create_mapping(struct map_desc *md); | |
237 | ||
238 | static unsigned long __init | |
239 | bootmem_init_node(int node, int initrd_node, struct meminfo *mi) | |
1da177e4 | 240 | { |
90072059 RK |
241 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; |
242 | unsigned long start_pfn, end_pfn, boot_pfn; | |
243 | unsigned int boot_pages; | |
244 | pg_data_t *pgdat; | |
245 | int i; | |
1da177e4 | 246 | |
90072059 RK |
247 | start_pfn = -1UL; |
248 | end_pfn = 0; | |
1da177e4 | 249 | |
90072059 RK |
250 | /* |
251 | * Calculate the pfn range, and map the memory banks for this node. | |
252 | */ | |
253 | for_each_nodebank(i, mi, node) { | |
254 | unsigned long start, end; | |
255 | struct map_desc map; | |
1da177e4 | 256 | |
90072059 RK |
257 | start = mi->bank[i].start >> PAGE_SHIFT; |
258 | end = (mi->bank[i].start + mi->bank[i].size) >> PAGE_SHIFT; | |
1da177e4 | 259 | |
90072059 RK |
260 | if (start_pfn > start) |
261 | start_pfn = start; | |
262 | if (end_pfn < end) | |
263 | end_pfn = end; | |
264 | ||
9769c246 DS |
265 | map.pfn = __phys_to_pfn(mi->bank[i].start); |
266 | map.virtual = __phys_to_virt(mi->bank[i].start); | |
90072059 RK |
267 | map.length = mi->bank[i].size; |
268 | map.type = MT_MEMORY; | |
269 | ||
270 | create_mapping(&map); | |
271 | } | |
1da177e4 LT |
272 | |
273 | /* | |
90072059 | 274 | * If there is no memory in this node, ignore it. |
1da177e4 | 275 | */ |
90072059 RK |
276 | if (end_pfn == 0) |
277 | return end_pfn; | |
1da177e4 | 278 | |
90072059 RK |
279 | /* |
280 | * Allocate the bootmem bitmap page. | |
281 | */ | |
282 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
283 | boot_pfn = find_bootmap_pfn(node, mi, boot_pages); | |
1da177e4 | 284 | |
90072059 RK |
285 | /* |
286 | * Initialise the bootmem allocator for this node, handing the | |
287 | * memory banks over to bootmem. | |
288 | */ | |
289 | node_set_online(node); | |
290 | pgdat = NODE_DATA(node); | |
291 | init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); | |
1da177e4 | 292 | |
90072059 RK |
293 | for_each_nodebank(i, mi, node) |
294 | free_bootmem_node(pgdat, mi->bank[i].start, mi->bank[i].size); | |
295 | ||
296 | /* | |
297 | * Reserve the bootmem bitmap for this node. | |
298 | */ | |
299 | reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, | |
300 | boot_pages << PAGE_SHIFT); | |
1da177e4 LT |
301 | |
302 | #ifdef CONFIG_BLK_DEV_INITRD | |
90072059 RK |
303 | /* |
304 | * If the initrd is in this node, reserve its memory. | |
305 | */ | |
306 | if (node == initrd_node) { | |
307 | reserve_bootmem_node(pgdat, phys_initrd_start, | |
1da177e4 LT |
308 | phys_initrd_size); |
309 | initrd_start = __phys_to_virt(phys_initrd_start); | |
310 | initrd_end = initrd_start + phys_initrd_size; | |
311 | } | |
312 | #endif | |
313 | ||
90072059 RK |
314 | /* |
315 | * Finally, reserve any node zero regions. | |
316 | */ | |
317 | if (node == 0) | |
318 | reserve_node_zero(pgdat); | |
319 | ||
320 | /* | |
321 | * initialise the zones within this node. | |
322 | */ | |
323 | memset(zone_size, 0, sizeof(zone_size)); | |
324 | memset(zhole_size, 0, sizeof(zhole_size)); | |
325 | ||
326 | /* | |
327 | * The size of this node has already been determined. If we need | |
328 | * to do anything fancy with the allocation of this memory to the | |
329 | * zones, now is the time to do it. | |
330 | */ | |
331 | zone_size[0] = end_pfn - start_pfn; | |
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 | */ | |
337 | zhole_size[0] = zone_size[0]; | |
338 | for_each_nodebank(i, mi, node) | |
339 | zhole_size[0] -= mi->bank[i].size >> PAGE_SHIFT; | |
340 | ||
341 | /* | |
342 | * Adjust the sizes according to any special requirements for | |
343 | * this machine type. | |
344 | */ | |
345 | arch_adjust_zones(node, zone_size, zhole_size); | |
346 | ||
347 | free_area_init_node(node, pgdat, zone_size, start_pfn, zhole_size); | |
348 | ||
349 | return end_pfn; | |
1da177e4 LT |
350 | } |
351 | ||
90072059 | 352 | static void __init bootmem_init(struct meminfo *mi) |
1da177e4 | 353 | { |
90072059 RK |
354 | unsigned long addr, memend_pfn = 0; |
355 | int node, initrd_node, i; | |
1da177e4 | 356 | |
90072059 RK |
357 | /* |
358 | * Invalidate the node number for empty or invalid memory banks | |
359 | */ | |
360 | for (i = 0; i < mi->nr_banks; i++) | |
361 | if (mi->bank[i].size == 0 || mi->bank[i].node >= MAX_NUMNODES) | |
362 | mi->bank[i].node = -1; | |
1da177e4 LT |
363 | |
364 | memcpy(&meminfo, mi, sizeof(meminfo)); | |
365 | ||
366 | /* | |
90072059 | 367 | * Clear out all the mappings below the kernel image. |
1da177e4 | 368 | */ |
1a47ebc0 NP |
369 | for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE) |
370 | pmd_clear(pmd_off_k(addr)); | |
371 | #ifdef CONFIG_XIP_KERNEL | |
372 | /* The XIP kernel is mapped in the module area -- skip over it */ | |
373 | addr = ((unsigned long)&_etext + PGDIR_SIZE - 1) & PGDIR_MASK; | |
374 | #endif | |
375 | for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE) | |
90072059 | 376 | pmd_clear(pmd_off_k(addr)); |
1da177e4 LT |
377 | |
378 | /* | |
90072059 RK |
379 | * Clear out all the kernel space mappings, except for the first |
380 | * memory bank, up to the end of the vmalloc region. | |
1da177e4 | 381 | */ |
90072059 RK |
382 | for (addr = __phys_to_virt(mi->bank[0].start + mi->bank[0].size); |
383 | addr < VMALLOC_END; addr += PGDIR_SIZE) | |
384 | pmd_clear(pmd_off_k(addr)); | |
1da177e4 LT |
385 | |
386 | /* | |
90072059 | 387 | * Locate which node contains the ramdisk image, if any. |
1da177e4 | 388 | */ |
90072059 | 389 | initrd_node = check_initrd(mi); |
1da177e4 | 390 | |
90072059 RK |
391 | /* |
392 | * Run through each node initialising the bootmem allocator. | |
393 | */ | |
394 | for_each_node(node) { | |
395 | unsigned long end_pfn; | |
1da177e4 | 396 | |
90072059 | 397 | end_pfn = bootmem_init_node(node, initrd_node, mi); |
1da177e4 LT |
398 | |
399 | /* | |
90072059 | 400 | * Remember the highest memory PFN. |
1da177e4 | 401 | */ |
90072059 RK |
402 | if (end_pfn > memend_pfn) |
403 | memend_pfn = end_pfn; | |
404 | } | |
1da177e4 | 405 | |
90072059 | 406 | high_memory = __va(memend_pfn << PAGE_SHIFT); |
1da177e4 | 407 | |
90072059 RK |
408 | /* |
409 | * This doesn't seem to be used by the Linux memory manager any | |
410 | * more, but is used by ll_rw_block. If we can get rid of it, we | |
411 | * also get rid of some of the stuff above as well. | |
412 | * | |
413 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in | |
414 | * the system, not the maximum PFN. | |
415 | */ | |
416 | max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET; | |
417 | } | |
1da177e4 | 418 | |
90072059 RK |
419 | /* |
420 | * Set up device the mappings. Since we clear out the page tables for all | |
421 | * mappings above VMALLOC_END, we will remove any debug device mappings. | |
422 | * This means you have to be careful how you debug this function, or any | |
02b30839 RK |
423 | * called function. This means you can't use any function or debugging |
424 | * method which may touch any device, otherwise the kernel _will_ crash. | |
90072059 RK |
425 | */ |
426 | static void __init devicemaps_init(struct machine_desc *mdesc) | |
427 | { | |
428 | struct map_desc map; | |
429 | unsigned long addr; | |
430 | void *vectors; | |
1da177e4 | 431 | |
02b30839 RK |
432 | /* |
433 | * Allocate the vector page early. | |
434 | */ | |
435 | vectors = alloc_bootmem_low_pages(PAGE_SIZE); | |
436 | BUG_ON(!vectors); | |
437 | ||
90072059 RK |
438 | for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE) |
439 | pmd_clear(pmd_off_k(addr)); | |
1da177e4 | 440 | |
1a47ebc0 NP |
441 | /* |
442 | * Map the kernel if it is XIP. | |
443 | * It is always first in the modulearea. | |
444 | */ | |
445 | #ifdef CONFIG_XIP_KERNEL | |
446 | map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & PGDIR_MASK); | |
447 | map.virtual = MODULE_START; | |
448 | map.length = ((unsigned long)&_etext - map.virtual + ~PGDIR_MASK) & PGDIR_MASK; | |
449 | map.type = MT_ROM; | |
450 | create_mapping(&map); | |
451 | #endif | |
452 | ||
90072059 RK |
453 | /* |
454 | * Map the cache flushing regions. | |
455 | */ | |
456 | #ifdef FLUSH_BASE | |
9769c246 | 457 | map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS); |
90072059 RK |
458 | map.virtual = FLUSH_BASE; |
459 | map.length = PGDIR_SIZE; | |
460 | map.type = MT_CACHECLEAN; | |
461 | create_mapping(&map); | |
462 | #endif | |
463 | #ifdef FLUSH_BASE_MINICACHE | |
9769c246 | 464 | map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS + PGDIR_SIZE); |
90072059 RK |
465 | map.virtual = FLUSH_BASE_MINICACHE; |
466 | map.length = PGDIR_SIZE; | |
467 | map.type = MT_MINICLEAN; | |
468 | create_mapping(&map); | |
469 | #endif | |
470 | ||
90072059 RK |
471 | /* |
472 | * Create a mapping for the machine vectors at the high-vectors | |
473 | * location (0xffff0000). If we aren't using high-vectors, also | |
474 | * create a mapping at the low-vectors virtual address. | |
475 | */ | |
9769c246 | 476 | map.pfn = __phys_to_pfn(virt_to_phys(vectors)); |
90072059 RK |
477 | map.virtual = 0xffff0000; |
478 | map.length = PAGE_SIZE; | |
479 | map.type = MT_HIGH_VECTORS; | |
480 | create_mapping(&map); | |
481 | ||
482 | if (!vectors_high()) { | |
483 | map.virtual = 0; | |
484 | map.type = MT_LOW_VECTORS; | |
485 | create_mapping(&map); | |
1da177e4 LT |
486 | } |
487 | ||
488 | /* | |
90072059 | 489 | * Ask the machine support to map in the statically mapped devices. |
90072059 RK |
490 | */ |
491 | if (mdesc->map_io) | |
492 | mdesc->map_io(); | |
6bf7bd69 RK |
493 | |
494 | /* | |
02b30839 RK |
495 | * Finally flush the caches and tlb to ensure that we're in a |
496 | * consistent state wrt the writebuffer. This also ensures that | |
497 | * any write-allocated cache lines in the vector page are written | |
498 | * back. After this point, we can start to touch devices again. | |
6bf7bd69 RK |
499 | */ |
500 | local_flush_tlb_all(); | |
02b30839 | 501 | flush_cache_all(); |
90072059 RK |
502 | } |
503 | ||
504 | /* | |
505 | * paging_init() sets up the page tables, initialises the zone memory | |
506 | * maps, and sets up the zero page, bad page and bad page tables. | |
507 | */ | |
508 | void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc) | |
509 | { | |
510 | void *zero_page; | |
511 | ||
512 | build_mem_type_table(); | |
513 | bootmem_init(mi); | |
514 | devicemaps_init(mdesc); | |
515 | ||
516 | top_pmd = pmd_off_k(0xffff0000); | |
517 | ||
518 | /* | |
519 | * allocate the zero page. Note that we count on this going ok. | |
1da177e4 | 520 | */ |
90072059 | 521 | zero_page = alloc_bootmem_low_pages(PAGE_SIZE); |
1da177e4 LT |
522 | memzero(zero_page, PAGE_SIZE); |
523 | empty_zero_page = virt_to_page(zero_page); | |
524 | flush_dcache_page(empty_zero_page); | |
525 | } | |
526 | ||
527 | static inline void free_area(unsigned long addr, unsigned long end, char *s) | |
528 | { | |
529 | unsigned int size = (end - addr) >> 10; | |
530 | ||
531 | for (; addr < end; addr += PAGE_SIZE) { | |
532 | struct page *page = virt_to_page(addr); | |
533 | ClearPageReserved(page); | |
534 | set_page_count(page, 1); | |
535 | free_page(addr); | |
536 | totalram_pages++; | |
537 | } | |
538 | ||
539 | if (size && s) | |
540 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); | |
541 | } | |
542 | ||
a013053d RK |
543 | static inline void |
544 | free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) | |
545 | { | |
546 | struct page *start_pg, *end_pg; | |
547 | unsigned long pg, pgend; | |
548 | ||
549 | /* | |
550 | * Convert start_pfn/end_pfn to a struct page pointer. | |
551 | */ | |
552 | start_pg = pfn_to_page(start_pfn); | |
553 | end_pg = pfn_to_page(end_pfn); | |
554 | ||
555 | /* | |
556 | * Convert to physical addresses, and | |
557 | * round start upwards and end downwards. | |
558 | */ | |
559 | pg = PAGE_ALIGN(__pa(start_pg)); | |
560 | pgend = __pa(end_pg) & PAGE_MASK; | |
561 | ||
562 | /* | |
563 | * If there are free pages between these, | |
564 | * free the section of the memmap array. | |
565 | */ | |
566 | if (pg < pgend) | |
567 | free_bootmem_node(NODE_DATA(node), pg, pgend - pg); | |
568 | } | |
569 | ||
570 | /* | |
571 | * The mem_map array can get very big. Free the unused area of the memory map. | |
572 | */ | |
573 | static void __init free_unused_memmap_node(int node, struct meminfo *mi) | |
574 | { | |
575 | unsigned long bank_start, prev_bank_end = 0; | |
576 | unsigned int i; | |
577 | ||
578 | /* | |
579 | * [FIXME] This relies on each bank being in address order. This | |
580 | * may not be the case, especially if the user has provided the | |
581 | * information on the command line. | |
582 | */ | |
90072059 | 583 | for_each_nodebank(i, mi, node) { |
a013053d RK |
584 | bank_start = mi->bank[i].start >> PAGE_SHIFT; |
585 | if (bank_start < prev_bank_end) { | |
586 | printk(KERN_ERR "MEM: unordered memory banks. " | |
587 | "Not freeing memmap.\n"); | |
588 | break; | |
589 | } | |
590 | ||
591 | /* | |
592 | * If we had a previous bank, and there is a space | |
593 | * between the current bank and the previous, free it. | |
594 | */ | |
595 | if (prev_bank_end && prev_bank_end != bank_start) | |
596 | free_memmap(node, prev_bank_end, bank_start); | |
597 | ||
598 | prev_bank_end = (mi->bank[i].start + | |
599 | mi->bank[i].size) >> PAGE_SHIFT; | |
600 | } | |
601 | } | |
602 | ||
1da177e4 LT |
603 | /* |
604 | * mem_init() marks the free areas in the mem_map and tells us how much | |
605 | * memory is free. This is done after various parts of the system have | |
606 | * claimed their memory after the kernel image. | |
607 | */ | |
608 | void __init mem_init(void) | |
609 | { | |
610 | unsigned int codepages, datapages, initpages; | |
611 | int i, node; | |
612 | ||
613 | codepages = &_etext - &_text; | |
614 | datapages = &_end - &__data_start; | |
615 | initpages = &__init_end - &__init_begin; | |
616 | ||
617 | #ifndef CONFIG_DISCONTIGMEM | |
618 | max_mapnr = virt_to_page(high_memory) - mem_map; | |
619 | #endif | |
620 | ||
1da177e4 LT |
621 | /* this will put all unused low memory onto the freelists */ |
622 | for_each_online_node(node) { | |
623 | pg_data_t *pgdat = NODE_DATA(node); | |
624 | ||
a013053d RK |
625 | free_unused_memmap_node(node, &meminfo); |
626 | ||
1da177e4 LT |
627 | if (pgdat->node_spanned_pages != 0) |
628 | totalram_pages += free_all_bootmem_node(pgdat); | |
629 | } | |
630 | ||
631 | #ifdef CONFIG_SA1111 | |
632 | /* now that our DMA memory is actually so designated, we can free it */ | |
633 | free_area(PAGE_OFFSET, (unsigned long)swapper_pg_dir, NULL); | |
634 | #endif | |
635 | ||
636 | /* | |
637 | * Since our memory may not be contiguous, calculate the | |
638 | * real number of pages we have in this system | |
639 | */ | |
640 | printk(KERN_INFO "Memory:"); | |
641 | ||
642 | num_physpages = 0; | |
643 | for (i = 0; i < meminfo.nr_banks; i++) { | |
644 | num_physpages += meminfo.bank[i].size >> PAGE_SHIFT; | |
645 | printk(" %ldMB", meminfo.bank[i].size >> 20); | |
646 | } | |
647 | ||
648 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); | |
649 | printk(KERN_NOTICE "Memory: %luKB available (%dK code, " | |
650 | "%dK data, %dK init)\n", | |
651 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
652 | codepages >> 10, datapages >> 10, initpages >> 10); | |
653 | ||
654 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { | |
655 | extern int sysctl_overcommit_memory; | |
656 | /* | |
657 | * On a machine this small we won't get | |
658 | * anywhere without overcommit, so turn | |
659 | * it on by default. | |
660 | */ | |
661 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
662 | } | |
663 | } | |
664 | ||
665 | void free_initmem(void) | |
666 | { | |
667 | if (!machine_is_integrator() && !machine_is_cintegrator()) { | |
668 | free_area((unsigned long)(&__init_begin), | |
669 | (unsigned long)(&__init_end), | |
670 | "init"); | |
671 | } | |
672 | } | |
673 | ||
674 | #ifdef CONFIG_BLK_DEV_INITRD | |
675 | ||
676 | static int keep_initrd; | |
677 | ||
678 | void free_initrd_mem(unsigned long start, unsigned long end) | |
679 | { | |
680 | if (!keep_initrd) | |
681 | free_area(start, end, "initrd"); | |
682 | } | |
683 | ||
684 | static int __init keepinitrd_setup(char *__unused) | |
685 | { | |
686 | keep_initrd = 1; | |
687 | return 1; | |
688 | } | |
689 | ||
690 | __setup("keepinitrd", keepinitrd_setup); | |
691 | #endif |