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1 | /* |
2 | * linux/arch/arm/mm/init.c |
3 | * |
4 | * Copyright (C) 1995-2005 Russell King |
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/kernel.h> |
11 | #include <linux/errno.h> |
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 | #include <linux/highmem.h> |
19 | #include <linux/gfp.h> |
20 | #include <linux/memblock.h> |
21 | #include <linux/sort.h> |
22 | |
23 | #include <asm/mach-types.h> |
24 | #include <asm/sections.h> |
25 | #include <asm/setup.h> |
26 | #include <asm/sizes.h> |
27 | #include <asm/tlb.h> |
28 | #include <asm/fixmap.h> |
29 | |
30 | #include <asm/mach/arch.h> |
31 | #include <asm/mach/map.h> |
32 | |
33 | #include "mm.h" |
34 | |
35 | static unsigned long phys_initrd_start __initdata = 0; |
36 | static unsigned long phys_initrd_size __initdata = 0; |
37 | |
38 | static int __init early_initrd(char *p) |
39 | { |
40 | unsigned long start, size; |
41 | char *endp; |
42 | |
43 | start = memparse(p, &endp); |
44 | if (*endp == ',') { |
45 | size = memparse(endp + 1, NULL); |
46 | |
47 | phys_initrd_start = start; |
48 | phys_initrd_size = size; |
49 | } |
50 | return 0; |
51 | } |
52 | early_param("initrd", early_initrd); |
53 | |
54 | static int __init parse_tag_initrd(const struct tag *tag) |
55 | { |
56 | printk(KERN_WARNING "ATAG_INITRD is deprecated; " |
57 | "please update your bootloader.\n"); |
58 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); |
59 | phys_initrd_size = tag->u.initrd.size; |
60 | return 0; |
61 | } |
62 | |
63 | __tagtable(ATAG_INITRD, parse_tag_initrd); |
64 | |
65 | static int __init parse_tag_initrd2(const struct tag *tag) |
66 | { |
67 | phys_initrd_start = tag->u.initrd.start; |
68 | phys_initrd_size = tag->u.initrd.size; |
69 | return 0; |
70 | } |
71 | |
72 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); |
73 | |
74 | /* |
75 | * This keeps memory configuration data used by a couple memory |
76 | * initialization functions, as well as show_mem() for the skipping |
77 | * of holes in the memory map. It is populated by arm_add_memory(). |
78 | */ |
79 | struct meminfo meminfo; |
80 | |
81 | void show_mem(void) |
82 | { |
83 | int free = 0, total = 0, reserved = 0; |
84 | int shared = 0, cached = 0, slab = 0, i; |
85 | struct meminfo * mi = &meminfo; |
86 | |
87 | printk("Mem-info:\n"); |
88 | show_free_areas(); |
89 | |
90 | for_each_bank (i, mi) { |
91 | struct membank *bank = &mi->bank[i]; |
92 | unsigned int pfn1, pfn2; |
93 | struct page *page, *end; |
94 | |
95 | pfn1 = bank_pfn_start(bank); |
96 | pfn2 = bank_pfn_end(bank); |
97 | |
98 | page = pfn_to_page(pfn1); |
99 | end = pfn_to_page(pfn2 - 1) + 1; |
100 | |
101 | do { |
102 | total++; |
103 | if (PageReserved(page)) |
104 | reserved++; |
105 | else if (PageSwapCache(page)) |
106 | cached++; |
107 | else if (PageSlab(page)) |
108 | slab++; |
109 | else if (!page_count(page)) |
110 | free++; |
111 | else |
112 | shared += page_count(page) - 1; |
113 | page++; |
114 | } while (page < end); |
115 | } |
116 | |
117 | printk("%d pages of RAM\n", total); |
118 | printk("%d free pages\n", free); |
119 | printk("%d reserved pages\n", reserved); |
120 | printk("%d slab pages\n", slab); |
121 | printk("%d pages shared\n", shared); |
122 | printk("%d pages swap cached\n", cached); |
123 | } |
124 | |
125 | static void __init find_limits(unsigned long *min, unsigned long *max_low, |
126 | unsigned long *max_high) |
127 | { |
128 | struct meminfo *mi = &meminfo; |
129 | int i; |
130 | |
131 | *min = -1UL; |
132 | *max_low = *max_high = 0; |
133 | |
134 | for_each_bank (i, mi) { |
135 | struct membank *bank = &mi->bank[i]; |
136 | unsigned long start, end; |
137 | |
138 | start = bank_pfn_start(bank); |
139 | end = bank_pfn_end(bank); |
140 | |
141 | if (*min > start) |
142 | *min = start; |
143 | if (*max_high < end) |
144 | *max_high = end; |
145 | if (bank->highmem) |
146 | continue; |
147 | if (*max_low < end) |
148 | *max_low = end; |
149 | } |
150 | } |
151 | |
152 | static void __init arm_bootmem_init(unsigned long start_pfn, |
153 | unsigned long end_pfn) |
154 | { |
155 | struct memblock_region *reg; |
156 | unsigned int boot_pages; |
157 | phys_addr_t bitmap; |
158 | pg_data_t *pgdat; |
159 | |
160 | /* |
161 | * Allocate the bootmem bitmap page. This must be in a region |
162 | * of memory which has already been mapped. |
163 | */ |
164 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); |
165 | bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, |
166 | __pfn_to_phys(end_pfn)); |
167 | |
168 | /* |
169 | * Initialise the bootmem allocator, handing the |
170 | * memory banks over to bootmem. |
171 | */ |
172 | node_set_online(0); |
173 | pgdat = NODE_DATA(0); |
174 | init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); |
175 | |
176 | /* Free the lowmem regions from memblock into bootmem. */ |
177 | for_each_memblock(memory, reg) { |
178 | unsigned long start = memblock_region_memory_base_pfn(reg); |
179 | unsigned long end = memblock_region_memory_end_pfn(reg); |
180 | |
181 | if (end >= end_pfn) |
182 | end = end_pfn; |
183 | if (start >= end) |
184 | break; |
185 | |
186 | free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); |
187 | } |
188 | |
189 | /* Reserve the lowmem memblock reserved regions in bootmem. */ |
190 | for_each_memblock(reserved, reg) { |
191 | unsigned long start = memblock_region_reserved_base_pfn(reg); |
192 | unsigned long end = memblock_region_reserved_end_pfn(reg); |
193 | |
194 | if (end >= end_pfn) |
195 | end = end_pfn; |
196 | if (start >= end) |
197 | break; |
198 | |
199 | reserve_bootmem(__pfn_to_phys(start), |
200 | (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); |
201 | } |
202 | } |
203 | |
204 | static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, |
205 | unsigned long max_high) |
206 | { |
207 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; |
208 | struct memblock_region *reg; |
209 | |
210 | /* |
211 | * initialise the zones. |
212 | */ |
213 | memset(zone_size, 0, sizeof(zone_size)); |
214 | |
215 | /* |
216 | * The memory size has already been determined. If we need |
217 | * to do anything fancy with the allocation of this memory |
218 | * to the zones, now is the time to do it. |
219 | */ |
220 | zone_size[0] = max_low - min; |
221 | #ifdef CONFIG_HIGHMEM |
222 | zone_size[ZONE_HIGHMEM] = max_high - max_low; |
223 | #endif |
224 | |
225 | /* |
226 | * Calculate the size of the holes. |
227 | * holes = node_size - sum(bank_sizes) |
228 | */ |
229 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
230 | for_each_memblock(memory, reg) { |
231 | unsigned long start = memblock_region_memory_base_pfn(reg); |
232 | unsigned long end = memblock_region_memory_end_pfn(reg); |
233 | |
234 | if (start < max_low) { |
235 | unsigned long low_end = min(end, max_low); |
236 | zhole_size[0] -= low_end - start; |
237 | } |
238 | #ifdef CONFIG_HIGHMEM |
239 | if (end > max_low) { |
240 | unsigned long high_start = max(start, max_low); |
241 | zhole_size[ZONE_HIGHMEM] -= end - high_start; |
242 | } |
243 | #endif |
244 | } |
245 | |
246 | /* |
247 | * Adjust the sizes according to any special requirements for |
248 | * this machine type. |
249 | */ |
250 | arch_adjust_zones(zone_size, zhole_size); |
251 | |
252 | free_area_init_node(0, zone_size, min, zhole_size); |
253 | } |
254 | |
255 | #ifndef CONFIG_SPARSEMEM |
256 | int pfn_valid(unsigned long pfn) |
257 | { |
258 | return memblock_is_memory(pfn << PAGE_SHIFT); |
259 | } |
260 | EXPORT_SYMBOL(pfn_valid); |
261 | |
262 | static void arm_memory_present(void) |
263 | { |
264 | } |
265 | #else |
266 | static void arm_memory_present(void) |
267 | { |
268 | struct memblock_region *reg; |
269 | |
270 | for_each_memblock(memory, reg) |
271 | memory_present(0, memblock_region_memory_base_pfn(reg), |
272 | memblock_region_memory_end_pfn(reg)); |
273 | } |
274 | #endif |
275 | |
276 | static int __init meminfo_cmp(const void *_a, const void *_b) |
277 | { |
278 | const struct membank *a = _a, *b = _b; |
279 | long cmp = bank_pfn_start(a) - bank_pfn_start(b); |
280 | return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; |
281 | } |
282 | |
283 | void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) |
284 | { |
285 | int i; |
286 | |
287 | sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL); |
288 | |
289 | memblock_init(); |
290 | for (i = 0; i < mi->nr_banks; i++) |
291 | memblock_add(mi->bank[i].start, mi->bank[i].size); |
292 | |
293 | /* Register the kernel text, kernel data and initrd with memblock. */ |
294 | #ifdef CONFIG_XIP_KERNEL |
295 | memblock_reserve(__pa(_sdata), _end - _sdata); |
296 | #else |
297 | memblock_reserve(__pa(_stext), _end - _stext); |
298 | #endif |
299 | #ifdef CONFIG_BLK_DEV_INITRD |
300 | if (phys_initrd_size) { |
301 | memblock_reserve(phys_initrd_start, phys_initrd_size); |
302 | |
303 | /* Now convert initrd to virtual addresses */ |
304 | initrd_start = __phys_to_virt(phys_initrd_start); |
305 | initrd_end = initrd_start + phys_initrd_size; |
306 | } |
307 | #endif |
308 | |
309 | arm_mm_memblock_reserve(); |
310 | |
311 | /* reserve any platform specific memblock areas */ |
312 | if (mdesc->reserve) |
313 | mdesc->reserve(); |
314 | |
315 | memblock_analyze(); |
316 | memblock_dump_all(); |
317 | } |
318 | |
319 | void __init bootmem_init(void) |
320 | { |
321 | unsigned long min, max_low, max_high; |
322 | |
323 | max_low = max_high = 0; |
324 | |
325 | find_limits(&min, &max_low, &max_high); |
326 | |
327 | arm_bootmem_init(min, max_low); |
328 | |
329 | /* |
330 | * Sparsemem tries to allocate bootmem in memory_present(), |
331 | * so must be done after the fixed reservations |
332 | */ |
333 | arm_memory_present(); |
334 | |
335 | /* |
336 | * sparse_init() needs the bootmem allocator up and running. |
337 | */ |
338 | sparse_init(); |
339 | |
340 | /* |
341 | * Now free the memory - free_area_init_node needs |
342 | * the sparse mem_map arrays initialized by sparse_init() |
343 | * for memmap_init_zone(), otherwise all PFNs are invalid. |
344 | */ |
345 | arm_bootmem_free(min, max_low, max_high); |
346 | |
347 | high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1; |
348 | |
349 | /* |
350 | * This doesn't seem to be used by the Linux memory manager any |
351 | * more, but is used by ll_rw_block. If we can get rid of it, we |
352 | * also get rid of some of the stuff above as well. |
353 | * |
354 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in |
355 | * the system, not the maximum PFN. |
356 | */ |
357 | max_low_pfn = max_low - PHYS_PFN_OFFSET; |
358 | max_pfn = max_high - PHYS_PFN_OFFSET; |
359 | } |
360 | |
361 | static inline int free_area(unsigned long pfn, unsigned long end, char *s) |
362 | { |
363 | unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); |
364 | |
365 | for (; pfn < end; pfn++) { |
366 | struct page *page = pfn_to_page(pfn); |
367 | ClearPageReserved(page); |
368 | init_page_count(page); |
369 | __free_page(page); |
370 | pages++; |
371 | } |
372 | |
373 | if (size && s) |
374 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); |
375 | |
376 | return pages; |
377 | } |
378 | |
379 | static inline void |
380 | free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
381 | { |
382 | struct page *start_pg, *end_pg; |
383 | unsigned long pg, pgend; |
384 | |
385 | /* |
386 | * Convert start_pfn/end_pfn to a struct page pointer. |
387 | */ |
388 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
389 | end_pg = pfn_to_page(end_pfn); |
390 | |
391 | /* |
392 | * Convert to physical addresses, and |
393 | * round start upwards and end downwards. |
394 | */ |
395 | pg = PAGE_ALIGN(__pa(start_pg)); |
396 | pgend = __pa(end_pg) & PAGE_MASK; |
397 | |
398 | /* |
399 | * If there are free pages between these, |
400 | * free the section of the memmap array. |
401 | */ |
402 | if (pg < pgend) |
403 | free_bootmem(pg, pgend - pg); |
404 | } |
405 | |
406 | /* |
407 | * The mem_map array can get very big. Free the unused area of the memory map. |
408 | */ |
409 | static void __init free_unused_memmap(struct meminfo *mi) |
410 | { |
411 | unsigned long bank_start, prev_bank_end = 0; |
412 | unsigned int i; |
413 | |
414 | /* |
415 | * This relies on each bank being in address order. |
416 | * The banks are sorted previously in bootmem_init(). |
417 | */ |
418 | for_each_bank(i, mi) { |
419 | struct membank *bank = &mi->bank[i]; |
420 | |
421 | bank_start = bank_pfn_start(bank); |
422 | |
423 | /* |
424 | * If we had a previous bank, and there is a space |
425 | * between the current bank and the previous, free it. |
426 | */ |
427 | if (prev_bank_end && prev_bank_end < bank_start) |
428 | free_memmap(prev_bank_end, bank_start); |
429 | |
430 | /* |
431 | * Align up here since the VM subsystem insists that the |
432 | * memmap entries are valid from the bank end aligned to |
433 | * MAX_ORDER_NR_PAGES. |
434 | */ |
435 | prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); |
436 | } |
437 | } |
438 | |
439 | static void __init free_highpages(void) |
440 | { |
441 | #ifdef CONFIG_HIGHMEM |
442 | unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; |
443 | struct memblock_region *mem, *res; |
444 | |
445 | /* set highmem page free */ |
446 | for_each_memblock(memory, mem) { |
447 | unsigned long start = memblock_region_memory_base_pfn(mem); |
448 | unsigned long end = memblock_region_memory_end_pfn(mem); |
449 | |
450 | /* Ignore complete lowmem entries */ |
451 | if (end <= max_low) |
452 | continue; |
453 | |
454 | /* Truncate partial highmem entries */ |
455 | if (start < max_low) |
456 | start = max_low; |
457 | |
458 | /* Find and exclude any reserved regions */ |
459 | for_each_memblock(reserved, res) { |
460 | unsigned long res_start, res_end; |
461 | |
462 | res_start = memblock_region_reserved_base_pfn(res); |
463 | res_end = memblock_region_reserved_end_pfn(res); |
464 | |
465 | if (res_end < start) |
466 | continue; |
467 | if (res_start < start) |
468 | res_start = start; |
469 | if (res_start > end) |
470 | res_start = end; |
471 | if (res_end > end) |
472 | res_end = end; |
473 | if (res_start != start) |
474 | totalhigh_pages += free_area(start, res_start, |
475 | NULL); |
476 | start = res_end; |
477 | if (start == end) |
478 | break; |
479 | } |
480 | |
481 | /* And now free anything which remains */ |
482 | if (start < end) |
483 | totalhigh_pages += free_area(start, end, NULL); |
484 | } |
485 | totalram_pages += totalhigh_pages; |
486 | #endif |
487 | } |
488 | |
489 | /* |
490 | * mem_init() marks the free areas in the mem_map and tells us how much |
491 | * memory is free. This is done after various parts of the system have |
492 | * claimed their memory after the kernel image. |
493 | */ |
494 | void __init mem_init(void) |
495 | { |
496 | unsigned long reserved_pages, free_pages; |
497 | struct memblock_region *reg; |
498 | int i; |
499 | #ifdef CONFIG_HAVE_TCM |
500 | /* These pointers are filled in on TCM detection */ |
501 | extern u32 dtcm_end; |
502 | extern u32 itcm_end; |
503 | #endif |
504 | |
505 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
506 | |
507 | /* this will put all unused low memory onto the freelists */ |
508 | free_unused_memmap(&meminfo); |
509 | |
510 | totalram_pages += free_all_bootmem(); |
511 | |
512 | #ifdef CONFIG_SA1111 |
513 | /* now that our DMA memory is actually so designated, we can free it */ |
514 | totalram_pages += free_area(PHYS_PFN_OFFSET, |
515 | __phys_to_pfn(__pa(swapper_pg_dir)), NULL); |
516 | #endif |
517 | |
518 | free_highpages(); |
519 | |
520 | reserved_pages = free_pages = 0; |
521 | |
522 | for_each_bank(i, &meminfo) { |
523 | struct membank *bank = &meminfo.bank[i]; |
524 | unsigned int pfn1, pfn2; |
525 | struct page *page, *end; |
526 | |
527 | pfn1 = bank_pfn_start(bank); |
528 | pfn2 = bank_pfn_end(bank); |
529 | |
530 | page = pfn_to_page(pfn1); |
531 | end = pfn_to_page(pfn2 - 1) + 1; |
532 | |
533 | do { |
534 | if (PageReserved(page)) |
535 | reserved_pages++; |
536 | else if (!page_count(page)) |
537 | free_pages++; |
538 | page++; |
539 | } while (page < end); |
540 | } |
541 | |
542 | /* |
543 | * Since our memory may not be contiguous, calculate the |
544 | * real number of pages we have in this system |
545 | */ |
546 | printk(KERN_INFO "Memory:"); |
547 | num_physpages = 0; |
548 | for_each_memblock(memory, reg) { |
549 | unsigned long pages = memblock_region_memory_end_pfn(reg) - |
550 | memblock_region_memory_base_pfn(reg); |
551 | num_physpages += pages; |
552 | printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); |
553 | } |
554 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); |
555 | |
556 | printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", |
557 | nr_free_pages() << (PAGE_SHIFT-10), |
558 | free_pages << (PAGE_SHIFT-10), |
559 | reserved_pages << (PAGE_SHIFT-10), |
560 | totalhigh_pages << (PAGE_SHIFT-10)); |
561 | |
562 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
563 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 |
564 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) |
565 | |
566 | printk(KERN_NOTICE "Virtual kernel memory layout:\n" |
567 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" |
568 | #ifdef CONFIG_HAVE_TCM |
569 | " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
570 | " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
571 | #endif |
572 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
573 | #ifdef CONFIG_MMU |
574 | " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" |
575 | #endif |
576 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
577 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" |
578 | #ifdef CONFIG_HIGHMEM |
579 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" |
580 | #endif |
581 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" |
582 | " .init : 0x%p" " - 0x%p" " (%4d kB)\n" |
583 | " .text : 0x%p" " - 0x%p" " (%4d kB)\n" |
584 | " .data : 0x%p" " - 0x%p" " (%4d kB)\n", |
585 | |
586 | MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + |
587 | (PAGE_SIZE)), |
588 | #ifdef CONFIG_HAVE_TCM |
589 | MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
590 | MLK(ITCM_OFFSET, (unsigned long) itcm_end), |
591 | #endif |
592 | MLK(FIXADDR_START, FIXADDR_TOP), |
593 | #ifdef CONFIG_MMU |
594 | MLM(CONSISTENT_BASE, CONSISTENT_END), |
595 | #endif |
596 | MLM(VMALLOC_START, VMALLOC_END), |
597 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
598 | #ifdef CONFIG_HIGHMEM |
599 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * |
600 | (PAGE_SIZE)), |
601 | #endif |
602 | MLM(MODULES_VADDR, MODULES_END), |
603 | |
604 | MLK_ROUNDUP(__init_begin, __init_end), |
605 | MLK_ROUNDUP(_text, _etext), |
606 | MLK_ROUNDUP(_sdata, _edata)); |
607 | |
608 | #undef MLK |
609 | #undef MLM |
610 | #undef MLK_ROUNDUP |
611 | |
612 | /* |
613 | * Check boundaries twice: Some fundamental inconsistencies can |
614 | * be detected at build time already. |
615 | */ |
616 | #ifdef CONFIG_MMU |
617 | BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); |
618 | BUG_ON(VMALLOC_END > CONSISTENT_BASE); |
619 | |
620 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
621 | BUG_ON(TASK_SIZE > MODULES_VADDR); |
622 | #endif |
623 | |
624 | #ifdef CONFIG_HIGHMEM |
625 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); |
626 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); |
627 | #endif |
628 | |
629 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { |
630 | extern int sysctl_overcommit_memory; |
631 | /* |
632 | * On a machine this small we won't get |
633 | * anywhere without overcommit, so turn |
634 | * it on by default. |
635 | */ |
636 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; |
637 | } |
638 | } |
639 | |
640 | void free_initmem(void) |
641 | { |
642 | #ifdef CONFIG_HAVE_TCM |
643 | extern char __tcm_start, __tcm_end; |
644 | |
645 | totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), |
646 | __phys_to_pfn(__pa(&__tcm_end)), |
647 | "TCM link"); |
648 | #endif |
649 | |
650 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
651 | totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), |
652 | __phys_to_pfn(__pa(__init_end)), |
653 | "init"); |
654 | } |
655 | |
656 | #ifdef CONFIG_BLK_DEV_INITRD |
657 | |
658 | static int keep_initrd; |
659 | |
660 | void free_initrd_mem(unsigned long start, unsigned long end) |
661 | { |
662 | if (!keep_initrd) |
663 | totalram_pages += free_area(__phys_to_pfn(__pa(start)), |
664 | __phys_to_pfn(__pa(end)), |
665 | "initrd"); |
666 | } |
667 | |
668 | static int __init keepinitrd_setup(char *__unused) |
669 | { |
670 | keep_initrd = 1; |
671 | return 1; |
672 | } |
673 | |
674 | __setup("keepinitrd", keepinitrd_setup); |
675 | #endif |
676 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9