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Merge branch 'for-linus' of git://git.kernel.dk/linux-block
[deliverable/linux.git] / arch / arm / mm / init.c
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/export.h>
17 #include <linux/nodemask.h>
18 #include <linux/initrd.h>
19 #include <linux/of_fdt.h>
20 #include <linux/highmem.h>
21 #include <linux/gfp.h>
22 #include <linux/memblock.h>
23
24 #include <asm/mach-types.h>
25 #include <asm/memblock.h>
26 #include <asm/prom.h>
27 #include <asm/sections.h>
28 #include <asm/setup.h>
29 #include <asm/sizes.h>
30 #include <asm/tlb.h>
31 #include <asm/fixmap.h>
32
33 #include <asm/mach/arch.h>
34 #include <asm/mach/map.h>
35 #include <asm/memblock.h>
36
37 #include "mm.h"
38
39 static unsigned long phys_initrd_start __initdata = 0;
40 static unsigned long phys_initrd_size __initdata = 0;
41
42 static int __init early_initrd(char *p)
43 {
44 unsigned long start, size;
45 char *endp;
46
47 start = memparse(p, &endp);
48 if (*endp == ',') {
49 size = memparse(endp + 1, NULL);
50
51 phys_initrd_start = start;
52 phys_initrd_size = size;
53 }
54 return 0;
55 }
56 early_param("initrd", early_initrd);
57
58 static int __init parse_tag_initrd(const struct tag *tag)
59 {
60 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
61 "please update your bootloader.\n");
62 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
63 phys_initrd_size = tag->u.initrd.size;
64 return 0;
65 }
66
67 __tagtable(ATAG_INITRD, parse_tag_initrd);
68
69 static int __init parse_tag_initrd2(const struct tag *tag)
70 {
71 phys_initrd_start = tag->u.initrd.start;
72 phys_initrd_size = tag->u.initrd.size;
73 return 0;
74 }
75
76 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
77
78 #ifdef CONFIG_OF_FLATTREE
79 void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end)
80 {
81 phys_initrd_start = start;
82 phys_initrd_size = end - start;
83 }
84 #endif /* CONFIG_OF_FLATTREE */
85
86 /*
87 * This keeps memory configuration data used by a couple memory
88 * initialization functions, as well as show_mem() for the skipping
89 * of holes in the memory map. It is populated by arm_add_memory().
90 */
91 struct meminfo meminfo;
92
93 void show_mem(unsigned int filter)
94 {
95 int free = 0, total = 0, reserved = 0;
96 int shared = 0, cached = 0, slab = 0, i;
97 struct meminfo * mi = &meminfo;
98
99 printk("Mem-info:\n");
100 show_free_areas(filter);
101
102 for_each_bank (i, mi) {
103 struct membank *bank = &mi->bank[i];
104 unsigned int pfn1, pfn2;
105 struct page *page, *end;
106
107 pfn1 = bank_pfn_start(bank);
108 pfn2 = bank_pfn_end(bank);
109
110 page = pfn_to_page(pfn1);
111 end = pfn_to_page(pfn2 - 1) + 1;
112
113 do {
114 total++;
115 if (PageReserved(page))
116 reserved++;
117 else if (PageSwapCache(page))
118 cached++;
119 else if (PageSlab(page))
120 slab++;
121 else if (!page_count(page))
122 free++;
123 else
124 shared += page_count(page) - 1;
125 page++;
126 } while (page < end);
127 }
128
129 printk("%d pages of RAM\n", total);
130 printk("%d free pages\n", free);
131 printk("%d reserved pages\n", reserved);
132 printk("%d slab pages\n", slab);
133 printk("%d pages shared\n", shared);
134 printk("%d pages swap cached\n", cached);
135 }
136
137 static void __init find_limits(unsigned long *min, unsigned long *max_low,
138 unsigned long *max_high)
139 {
140 struct meminfo *mi = &meminfo;
141 int i;
142
143 /* This assumes the meminfo array is properly sorted */
144 *min = bank_pfn_start(&mi->bank[0]);
145 for_each_bank (i, mi)
146 if (mi->bank[i].highmem)
147 break;
148 *max_low = bank_pfn_end(&mi->bank[i - 1]);
149 *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]);
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 #ifdef CONFIG_ZONE_DMA
205
206 unsigned long arm_dma_zone_size __read_mostly;
207 EXPORT_SYMBOL(arm_dma_zone_size);
208
209 /*
210 * The DMA mask corresponding to the maximum bus address allocatable
211 * using GFP_DMA. The default here places no restriction on DMA
212 * allocations. This must be the smallest DMA mask in the system,
213 * so a successful GFP_DMA allocation will always satisfy this.
214 */
215 u32 arm_dma_limit;
216
217 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
218 unsigned long dma_size)
219 {
220 if (size[0] <= dma_size)
221 return;
222
223 size[ZONE_NORMAL] = size[0] - dma_size;
224 size[ZONE_DMA] = dma_size;
225 hole[ZONE_NORMAL] = hole[0];
226 hole[ZONE_DMA] = 0;
227 }
228 #endif
229
230 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
231 unsigned long max_high)
232 {
233 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
234 struct memblock_region *reg;
235
236 /*
237 * initialise the zones.
238 */
239 memset(zone_size, 0, sizeof(zone_size));
240
241 /*
242 * The memory size has already been determined. If we need
243 * to do anything fancy with the allocation of this memory
244 * to the zones, now is the time to do it.
245 */
246 zone_size[0] = max_low - min;
247 #ifdef CONFIG_HIGHMEM
248 zone_size[ZONE_HIGHMEM] = max_high - max_low;
249 #endif
250
251 /*
252 * Calculate the size of the holes.
253 * holes = node_size - sum(bank_sizes)
254 */
255 memcpy(zhole_size, zone_size, sizeof(zhole_size));
256 for_each_memblock(memory, reg) {
257 unsigned long start = memblock_region_memory_base_pfn(reg);
258 unsigned long end = memblock_region_memory_end_pfn(reg);
259
260 if (start < max_low) {
261 unsigned long low_end = min(end, max_low);
262 zhole_size[0] -= low_end - start;
263 }
264 #ifdef CONFIG_HIGHMEM
265 if (end > max_low) {
266 unsigned long high_start = max(start, max_low);
267 zhole_size[ZONE_HIGHMEM] -= end - high_start;
268 }
269 #endif
270 }
271
272 #ifdef CONFIG_ZONE_DMA
273 /*
274 * Adjust the sizes according to any special requirements for
275 * this machine type.
276 */
277 if (arm_dma_zone_size) {
278 arm_adjust_dma_zone(zone_size, zhole_size,
279 arm_dma_zone_size >> PAGE_SHIFT);
280 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
281 } else
282 arm_dma_limit = 0xffffffff;
283 #endif
284
285 free_area_init_node(0, zone_size, min, zhole_size);
286 }
287
288 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
289 int pfn_valid(unsigned long pfn)
290 {
291 return memblock_is_memory(__pfn_to_phys(pfn));
292 }
293 EXPORT_SYMBOL(pfn_valid);
294 #endif
295
296 #ifndef CONFIG_SPARSEMEM
297 static void arm_memory_present(void)
298 {
299 }
300 #else
301 static void arm_memory_present(void)
302 {
303 struct memblock_region *reg;
304
305 for_each_memblock(memory, reg)
306 memory_present(0, memblock_region_memory_base_pfn(reg),
307 memblock_region_memory_end_pfn(reg));
308 }
309 #endif
310
311 static bool arm_memblock_steal_permitted = true;
312
313 phys_addr_t arm_memblock_steal(phys_addr_t size, phys_addr_t align)
314 {
315 phys_addr_t phys;
316
317 BUG_ON(!arm_memblock_steal_permitted);
318
319 phys = memblock_alloc(size, align);
320 memblock_free(phys, size);
321 memblock_remove(phys, size);
322
323 return phys;
324 }
325
326 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
327 {
328 int i;
329
330 for (i = 0; i < mi->nr_banks; i++)
331 memblock_add(mi->bank[i].start, mi->bank[i].size);
332
333 /* Register the kernel text, kernel data and initrd with memblock. */
334 #ifdef CONFIG_XIP_KERNEL
335 memblock_reserve(__pa(_sdata), _end - _sdata);
336 #else
337 memblock_reserve(__pa(_stext), _end - _stext);
338 #endif
339 #ifdef CONFIG_BLK_DEV_INITRD
340 if (phys_initrd_size &&
341 !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
342 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n",
343 phys_initrd_start, phys_initrd_size);
344 phys_initrd_start = phys_initrd_size = 0;
345 }
346 if (phys_initrd_size &&
347 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
348 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
349 phys_initrd_start, phys_initrd_size);
350 phys_initrd_start = phys_initrd_size = 0;
351 }
352 if (phys_initrd_size) {
353 memblock_reserve(phys_initrd_start, phys_initrd_size);
354
355 /* Now convert initrd to virtual addresses */
356 initrd_start = __phys_to_virt(phys_initrd_start);
357 initrd_end = initrd_start + phys_initrd_size;
358 }
359 #endif
360
361 arm_mm_memblock_reserve();
362 arm_dt_memblock_reserve();
363
364 /* reserve any platform specific memblock areas */
365 if (mdesc->reserve)
366 mdesc->reserve();
367
368 arm_memblock_steal_permitted = false;
369 memblock_allow_resize();
370 memblock_dump_all();
371 }
372
373 void __init bootmem_init(void)
374 {
375 unsigned long min, max_low, max_high;
376
377 max_low = max_high = 0;
378
379 find_limits(&min, &max_low, &max_high);
380
381 arm_bootmem_init(min, max_low);
382
383 /*
384 * Sparsemem tries to allocate bootmem in memory_present(),
385 * so must be done after the fixed reservations
386 */
387 arm_memory_present();
388
389 /*
390 * sparse_init() needs the bootmem allocator up and running.
391 */
392 sparse_init();
393
394 /*
395 * Now free the memory - free_area_init_node needs
396 * the sparse mem_map arrays initialized by sparse_init()
397 * for memmap_init_zone(), otherwise all PFNs are invalid.
398 */
399 arm_bootmem_free(min, max_low, max_high);
400
401 /*
402 * This doesn't seem to be used by the Linux memory manager any
403 * more, but is used by ll_rw_block. If we can get rid of it, we
404 * also get rid of some of the stuff above as well.
405 *
406 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
407 * the system, not the maximum PFN.
408 */
409 max_low_pfn = max_low - PHYS_PFN_OFFSET;
410 max_pfn = max_high - PHYS_PFN_OFFSET;
411 }
412
413 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
414 {
415 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
416
417 for (; pfn < end; pfn++) {
418 struct page *page = pfn_to_page(pfn);
419 ClearPageReserved(page);
420 init_page_count(page);
421 __free_page(page);
422 pages++;
423 }
424
425 if (size && s)
426 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
427
428 return pages;
429 }
430
431 /*
432 * Poison init memory with an undefined instruction (ARM) or a branch to an
433 * undefined instruction (Thumb).
434 */
435 static inline void poison_init_mem(void *s, size_t count)
436 {
437 u32 *p = (u32 *)s;
438 for (; count != 0; count -= 4)
439 *p++ = 0xe7fddef0;
440 }
441
442 static inline void
443 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
444 {
445 struct page *start_pg, *end_pg;
446 unsigned long pg, pgend;
447
448 /*
449 * Convert start_pfn/end_pfn to a struct page pointer.
450 */
451 start_pg = pfn_to_page(start_pfn - 1) + 1;
452 end_pg = pfn_to_page(end_pfn - 1) + 1;
453
454 /*
455 * Convert to physical addresses, and
456 * round start upwards and end downwards.
457 */
458 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
459 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
460
461 /*
462 * If there are free pages between these,
463 * free the section of the memmap array.
464 */
465 if (pg < pgend)
466 free_bootmem(pg, pgend - pg);
467 }
468
469 /*
470 * The mem_map array can get very big. Free the unused area of the memory map.
471 */
472 static void __init free_unused_memmap(struct meminfo *mi)
473 {
474 unsigned long bank_start, prev_bank_end = 0;
475 unsigned int i;
476
477 /*
478 * This relies on each bank being in address order.
479 * The banks are sorted previously in bootmem_init().
480 */
481 for_each_bank(i, mi) {
482 struct membank *bank = &mi->bank[i];
483
484 bank_start = bank_pfn_start(bank);
485
486 #ifdef CONFIG_SPARSEMEM
487 /*
488 * Take care not to free memmap entries that don't exist
489 * due to SPARSEMEM sections which aren't present.
490 */
491 bank_start = min(bank_start,
492 ALIGN(prev_bank_end, PAGES_PER_SECTION));
493 #else
494 /*
495 * Align down here since the VM subsystem insists that the
496 * memmap entries are valid from the bank start aligned to
497 * MAX_ORDER_NR_PAGES.
498 */
499 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
500 #endif
501 /*
502 * If we had a previous bank, and there is a space
503 * between the current bank and the previous, free it.
504 */
505 if (prev_bank_end && prev_bank_end < bank_start)
506 free_memmap(prev_bank_end, bank_start);
507
508 /*
509 * Align up here since the VM subsystem insists that the
510 * memmap entries are valid from the bank end aligned to
511 * MAX_ORDER_NR_PAGES.
512 */
513 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
514 }
515
516 #ifdef CONFIG_SPARSEMEM
517 if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
518 free_memmap(prev_bank_end,
519 ALIGN(prev_bank_end, PAGES_PER_SECTION));
520 #endif
521 }
522
523 static void __init free_highpages(void)
524 {
525 #ifdef CONFIG_HIGHMEM
526 unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
527 struct memblock_region *mem, *res;
528
529 /* set highmem page free */
530 for_each_memblock(memory, mem) {
531 unsigned long start = memblock_region_memory_base_pfn(mem);
532 unsigned long end = memblock_region_memory_end_pfn(mem);
533
534 /* Ignore complete lowmem entries */
535 if (end <= max_low)
536 continue;
537
538 /* Truncate partial highmem entries */
539 if (start < max_low)
540 start = max_low;
541
542 /* Find and exclude any reserved regions */
543 for_each_memblock(reserved, res) {
544 unsigned long res_start, res_end;
545
546 res_start = memblock_region_reserved_base_pfn(res);
547 res_end = memblock_region_reserved_end_pfn(res);
548
549 if (res_end < start)
550 continue;
551 if (res_start < start)
552 res_start = start;
553 if (res_start > end)
554 res_start = end;
555 if (res_end > end)
556 res_end = end;
557 if (res_start != start)
558 totalhigh_pages += free_area(start, res_start,
559 NULL);
560 start = res_end;
561 if (start == end)
562 break;
563 }
564
565 /* And now free anything which remains */
566 if (start < end)
567 totalhigh_pages += free_area(start, end, NULL);
568 }
569 totalram_pages += totalhigh_pages;
570 #endif
571 }
572
573 /*
574 * mem_init() marks the free areas in the mem_map and tells us how much
575 * memory is free. This is done after various parts of the system have
576 * claimed their memory after the kernel image.
577 */
578 void __init mem_init(void)
579 {
580 unsigned long reserved_pages, free_pages;
581 struct memblock_region *reg;
582 int i;
583 #ifdef CONFIG_HAVE_TCM
584 /* These pointers are filled in on TCM detection */
585 extern u32 dtcm_end;
586 extern u32 itcm_end;
587 #endif
588
589 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
590
591 /* this will put all unused low memory onto the freelists */
592 free_unused_memmap(&meminfo);
593
594 totalram_pages += free_all_bootmem();
595
596 #ifdef CONFIG_SA1111
597 /* now that our DMA memory is actually so designated, we can free it */
598 totalram_pages += free_area(PHYS_PFN_OFFSET,
599 __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
600 #endif
601
602 free_highpages();
603
604 reserved_pages = free_pages = 0;
605
606 for_each_bank(i, &meminfo) {
607 struct membank *bank = &meminfo.bank[i];
608 unsigned int pfn1, pfn2;
609 struct page *page, *end;
610
611 pfn1 = bank_pfn_start(bank);
612 pfn2 = bank_pfn_end(bank);
613
614 page = pfn_to_page(pfn1);
615 end = pfn_to_page(pfn2 - 1) + 1;
616
617 do {
618 if (PageReserved(page))
619 reserved_pages++;
620 else if (!page_count(page))
621 free_pages++;
622 page++;
623 } while (page < end);
624 }
625
626 /*
627 * Since our memory may not be contiguous, calculate the
628 * real number of pages we have in this system
629 */
630 printk(KERN_INFO "Memory:");
631 num_physpages = 0;
632 for_each_memblock(memory, reg) {
633 unsigned long pages = memblock_region_memory_end_pfn(reg) -
634 memblock_region_memory_base_pfn(reg);
635 num_physpages += pages;
636 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
637 }
638 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
639
640 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
641 nr_free_pages() << (PAGE_SHIFT-10),
642 free_pages << (PAGE_SHIFT-10),
643 reserved_pages << (PAGE_SHIFT-10),
644 totalhigh_pages << (PAGE_SHIFT-10));
645
646 #define MLK(b, t) b, t, ((t) - (b)) >> 10
647 #define MLM(b, t) b, t, ((t) - (b)) >> 20
648 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
649
650 printk(KERN_NOTICE "Virtual kernel memory layout:\n"
651 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
652 #ifdef CONFIG_HAVE_TCM
653 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
654 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
655 #endif
656 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
657 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
658 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
659 #ifdef CONFIG_HIGHMEM
660 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n"
661 #endif
662 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
663 " .text : 0x%p" " - 0x%p" " (%4d kB)\n"
664 " .init : 0x%p" " - 0x%p" " (%4d kB)\n"
665 " .data : 0x%p" " - 0x%p" " (%4d kB)\n"
666 " .bss : 0x%p" " - 0x%p" " (%4d kB)\n",
667
668 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
669 (PAGE_SIZE)),
670 #ifdef CONFIG_HAVE_TCM
671 MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
672 MLK(ITCM_OFFSET, (unsigned long) itcm_end),
673 #endif
674 MLK(FIXADDR_START, FIXADDR_TOP),
675 MLM(VMALLOC_START, VMALLOC_END),
676 MLM(PAGE_OFFSET, (unsigned long)high_memory),
677 #ifdef CONFIG_HIGHMEM
678 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
679 (PAGE_SIZE)),
680 #endif
681 MLM(MODULES_VADDR, MODULES_END),
682
683 MLK_ROUNDUP(_text, _etext),
684 MLK_ROUNDUP(__init_begin, __init_end),
685 MLK_ROUNDUP(_sdata, _edata),
686 MLK_ROUNDUP(__bss_start, __bss_stop));
687
688 #undef MLK
689 #undef MLM
690 #undef MLK_ROUNDUP
691
692 /*
693 * Check boundaries twice: Some fundamental inconsistencies can
694 * be detected at build time already.
695 */
696 #ifdef CONFIG_MMU
697 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
698 BUG_ON(TASK_SIZE > MODULES_VADDR);
699 #endif
700
701 #ifdef CONFIG_HIGHMEM
702 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
703 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
704 #endif
705
706 if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
707 extern int sysctl_overcommit_memory;
708 /*
709 * On a machine this small we won't get
710 * anywhere without overcommit, so turn
711 * it on by default.
712 */
713 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
714 }
715 }
716
717 void free_initmem(void)
718 {
719 #ifdef CONFIG_HAVE_TCM
720 extern char __tcm_start, __tcm_end;
721
722 poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
723 totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
724 __phys_to_pfn(__pa(&__tcm_end)),
725 "TCM link");
726 #endif
727
728 poison_init_mem(__init_begin, __init_end - __init_begin);
729 if (!machine_is_integrator() && !machine_is_cintegrator())
730 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
731 __phys_to_pfn(__pa(__init_end)),
732 "init");
733 }
734
735 #ifdef CONFIG_BLK_DEV_INITRD
736
737 static int keep_initrd;
738
739 void free_initrd_mem(unsigned long start, unsigned long end)
740 {
741 if (!keep_initrd) {
742 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
743 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
744 __phys_to_pfn(__pa(end)),
745 "initrd");
746 }
747 }
748
749 static int __init keepinitrd_setup(char *__unused)
750 {
751 keep_initrd = 1;
752 return 1;
753 }
754
755 __setup("keepinitrd", keepinitrd_setup);
756 #endif
Linux kernel - Deliverables
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