Merge branch 'for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux...
[linux-2.6.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 #include <linux/sort.h>
24
25 #include <asm/mach-types.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
36 #include "mm.h"
37
38 static unsigned long phys_initrd_start __initdata = 0;
39 static unsigned long phys_initrd_size __initdata = 0;
40
41 static int __init early_initrd(char *p)
42 {
43         unsigned long start, size;
44         char *endp;
45
46         start = memparse(p, &endp);
47         if (*endp == ',') {
48                 size = memparse(endp + 1, NULL);
49
50                 phys_initrd_start = start;
51                 phys_initrd_size = size;
52         }
53         return 0;
54 }
55 early_param("initrd", early_initrd);
56
57 static int __init parse_tag_initrd(const struct tag *tag)
58 {
59         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
60                 "please update your bootloader.\n");
61         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
62         phys_initrd_size = tag->u.initrd.size;
63         return 0;
64 }
65
66 __tagtable(ATAG_INITRD, parse_tag_initrd);
67
68 static int __init parse_tag_initrd2(const struct tag *tag)
69 {
70         phys_initrd_start = tag->u.initrd.start;
71         phys_initrd_size = tag->u.initrd.size;
72         return 0;
73 }
74
75 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
76
77 #ifdef CONFIG_OF_FLATTREE
78 void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end)
79 {
80         phys_initrd_start = start;
81         phys_initrd_size = end - start;
82 }
83 #endif /* CONFIG_OF_FLATTREE */
84
85 /*
86  * This keeps memory configuration data used by a couple memory
87  * initialization functions, as well as show_mem() for the skipping
88  * of holes in the memory map.  It is populated by arm_add_memory().
89  */
90 struct meminfo meminfo;
91
92 void show_mem(unsigned int filter)
93 {
94         int free = 0, total = 0, reserved = 0;
95         int shared = 0, cached = 0, slab = 0, i;
96         struct meminfo * mi = &meminfo;
97
98         printk("Mem-info:\n");
99         show_free_areas(filter);
100
101         for_each_bank (i, mi) {
102                 struct membank *bank = &mi->bank[i];
103                 unsigned int pfn1, pfn2;
104                 struct page *page, *end;
105
106                 pfn1 = bank_pfn_start(bank);
107                 pfn2 = bank_pfn_end(bank);
108
109                 page = pfn_to_page(pfn1);
110                 end  = pfn_to_page(pfn2 - 1) + 1;
111
112                 do {
113                         total++;
114                         if (PageReserved(page))
115                                 reserved++;
116                         else if (PageSwapCache(page))
117                                 cached++;
118                         else if (PageSlab(page))
119                                 slab++;
120                         else if (!page_count(page))
121                                 free++;
122                         else
123                                 shared += page_count(page) - 1;
124                         page++;
125                 } while (page < end);
126         }
127
128         printk("%d pages of RAM\n", total);
129         printk("%d free pages\n", free);
130         printk("%d reserved pages\n", reserved);
131         printk("%d slab pages\n", slab);
132         printk("%d pages shared\n", shared);
133         printk("%d pages swap cached\n", cached);
134 }
135
136 static void __init find_limits(unsigned long *min, unsigned long *max_low,
137         unsigned long *max_high)
138 {
139         struct meminfo *mi = &meminfo;
140         int i;
141
142         *min = -1UL;
143         *max_low = *max_high = 0;
144
145         for_each_bank (i, mi) {
146                 struct membank *bank = &mi->bank[i];
147                 unsigned long start, end;
148
149                 start = bank_pfn_start(bank);
150                 end = bank_pfn_end(bank);
151
152                 if (*min > start)
153                         *min = start;
154                 if (*max_high < end)
155                         *max_high = end;
156                 if (bank->highmem)
157                         continue;
158                 if (*max_low < end)
159                         *max_low = end;
160         }
161 }
162
163 static void __init arm_bootmem_init(unsigned long start_pfn,
164         unsigned long end_pfn)
165 {
166         struct memblock_region *reg;
167         unsigned int boot_pages;
168         phys_addr_t bitmap;
169         pg_data_t *pgdat;
170
171         /*
172          * Allocate the bootmem bitmap page.  This must be in a region
173          * of memory which has already been mapped.
174          */
175         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
176         bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
177                                 __pfn_to_phys(end_pfn));
178
179         /*
180          * Initialise the bootmem allocator, handing the
181          * memory banks over to bootmem.
182          */
183         node_set_online(0);
184         pgdat = NODE_DATA(0);
185         init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
186
187         /* Free the lowmem regions from memblock into bootmem. */
188         for_each_memblock(memory, reg) {
189                 unsigned long start = memblock_region_memory_base_pfn(reg);
190                 unsigned long end = memblock_region_memory_end_pfn(reg);
191
192                 if (end >= end_pfn)
193                         end = end_pfn;
194                 if (start >= end)
195                         break;
196
197                 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
198         }
199
200         /* Reserve the lowmem memblock reserved regions in bootmem. */
201         for_each_memblock(reserved, reg) {
202                 unsigned long start = memblock_region_reserved_base_pfn(reg);
203                 unsigned long end = memblock_region_reserved_end_pfn(reg);
204
205                 if (end >= end_pfn)
206                         end = end_pfn;
207                 if (start >= end)
208                         break;
209
210                 reserve_bootmem(__pfn_to_phys(start),
211                                 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
212         }
213 }
214
215 #ifdef CONFIG_ZONE_DMA
216
217 unsigned long arm_dma_zone_size __read_mostly;
218 EXPORT_SYMBOL(arm_dma_zone_size);
219
220 /*
221  * The DMA mask corresponding to the maximum bus address allocatable
222  * using GFP_DMA.  The default here places no restriction on DMA
223  * allocations.  This must be the smallest DMA mask in the system,
224  * so a successful GFP_DMA allocation will always satisfy this.
225  */
226 u32 arm_dma_limit;
227
228 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
229         unsigned long dma_size)
230 {
231         if (size[0] <= dma_size)
232                 return;
233
234         size[ZONE_NORMAL] = size[0] - dma_size;
235         size[ZONE_DMA] = dma_size;
236         hole[ZONE_NORMAL] = hole[0];
237         hole[ZONE_DMA] = 0;
238 }
239 #endif
240
241 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
242         unsigned long max_high)
243 {
244         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
245         struct memblock_region *reg;
246
247         /*
248          * initialise the zones.
249          */
250         memset(zone_size, 0, sizeof(zone_size));
251
252         /*
253          * The memory size has already been determined.  If we need
254          * to do anything fancy with the allocation of this memory
255          * to the zones, now is the time to do it.
256          */
257         zone_size[0] = max_low - min;
258 #ifdef CONFIG_HIGHMEM
259         zone_size[ZONE_HIGHMEM] = max_high - max_low;
260 #endif
261
262         /*
263          * Calculate the size of the holes.
264          *  holes = node_size - sum(bank_sizes)
265          */
266         memcpy(zhole_size, zone_size, sizeof(zhole_size));
267         for_each_memblock(memory, reg) {
268                 unsigned long start = memblock_region_memory_base_pfn(reg);
269                 unsigned long end = memblock_region_memory_end_pfn(reg);
270
271                 if (start < max_low) {
272                         unsigned long low_end = min(end, max_low);
273                         zhole_size[0] -= low_end - start;
274                 }
275 #ifdef CONFIG_HIGHMEM
276                 if (end > max_low) {
277                         unsigned long high_start = max(start, max_low);
278                         zhole_size[ZONE_HIGHMEM] -= end - high_start;
279                 }
280 #endif
281         }
282
283 #ifdef CONFIG_ZONE_DMA
284         /*
285          * Adjust the sizes according to any special requirements for
286          * this machine type.
287          */
288         if (arm_dma_zone_size) {
289                 arm_adjust_dma_zone(zone_size, zhole_size,
290                         arm_dma_zone_size >> PAGE_SHIFT);
291                 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
292         } else
293                 arm_dma_limit = 0xffffffff;
294 #endif
295
296         free_area_init_node(0, zone_size, min, zhole_size);
297 }
298
299 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
300 int pfn_valid(unsigned long pfn)
301 {
302         return memblock_is_memory(__pfn_to_phys(pfn));
303 }
304 EXPORT_SYMBOL(pfn_valid);
305 #endif
306
307 #ifndef CONFIG_SPARSEMEM
308 static void arm_memory_present(void)
309 {
310 }
311 #else
312 static void arm_memory_present(void)
313 {
314         struct memblock_region *reg;
315
316         for_each_memblock(memory, reg)
317                 memory_present(0, memblock_region_memory_base_pfn(reg),
318                                memblock_region_memory_end_pfn(reg));
319 }
320 #endif
321
322 static int __init meminfo_cmp(const void *_a, const void *_b)
323 {
324         const struct membank *a = _a, *b = _b;
325         long cmp = bank_pfn_start(a) - bank_pfn_start(b);
326         return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
327 }
328
329 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
330 {
331         int i;
332
333         sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
334
335         memblock_init();
336         for (i = 0; i < mi->nr_banks; i++)
337                 memblock_add(mi->bank[i].start, mi->bank[i].size);
338
339         /* Register the kernel text, kernel data and initrd with memblock. */
340 #ifdef CONFIG_XIP_KERNEL
341         memblock_reserve(__pa(_sdata), _end - _sdata);
342 #else
343         memblock_reserve(__pa(_stext), _end - _stext);
344 #endif
345 #ifdef CONFIG_BLK_DEV_INITRD
346         if (phys_initrd_size &&
347             !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
348                 pr_err("INITRD: 0x%08lx+0x%08lx is not a 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_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
354                 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
355                        phys_initrd_start, phys_initrd_size);
356                 phys_initrd_start = phys_initrd_size = 0;
357         }
358         if (phys_initrd_size) {
359                 memblock_reserve(phys_initrd_start, phys_initrd_size);
360
361                 /* Now convert initrd to virtual addresses */
362                 initrd_start = __phys_to_virt(phys_initrd_start);
363                 initrd_end = initrd_start + phys_initrd_size;
364         }
365 #endif
366
367         arm_mm_memblock_reserve();
368         arm_dt_memblock_reserve();
369
370         /* reserve any platform specific memblock areas */
371         if (mdesc->reserve)
372                 mdesc->reserve();
373
374         memblock_analyze();
375         memblock_dump_all();
376 }
377
378 void __init bootmem_init(void)
379 {
380         unsigned long min, max_low, max_high;
381
382         max_low = max_high = 0;
383
384         find_limits(&min, &max_low, &max_high);
385
386         arm_bootmem_init(min, max_low);
387
388         /*
389          * Sparsemem tries to allocate bootmem in memory_present(),
390          * so must be done after the fixed reservations
391          */
392         arm_memory_present();
393
394         /*
395          * sparse_init() needs the bootmem allocator up and running.
396          */
397         sparse_init();
398
399         /*
400          * Now free the memory - free_area_init_node needs
401          * the sparse mem_map arrays initialized by sparse_init()
402          * for memmap_init_zone(), otherwise all PFNs are invalid.
403          */
404         arm_bootmem_free(min, max_low, max_high);
405
406         high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1;
407
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_low_pfn = max_low - PHYS_PFN_OFFSET;
417         max_pfn = max_high - PHYS_PFN_OFFSET;
418 }
419
420 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
421 {
422         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
423
424         for (; pfn < end; pfn++) {
425                 struct page *page = pfn_to_page(pfn);
426                 ClearPageReserved(page);
427                 init_page_count(page);
428                 __free_page(page);
429                 pages++;
430         }
431
432         if (size && s)
433                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
434
435         return pages;
436 }
437
438 /*
439  * Poison init memory with an undefined instruction (ARM) or a branch to an
440  * undefined instruction (Thumb).
441  */
442 static inline void poison_init_mem(void *s, size_t count)
443 {
444         u32 *p = (u32 *)s;
445         for (; count != 0; count -= 4)
446                 *p++ = 0xe7fddef0;
447 }
448
449 static inline void
450 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
451 {
452         struct page *start_pg, *end_pg;
453         unsigned long pg, pgend;
454
455         /*
456          * Convert start_pfn/end_pfn to a struct page pointer.
457          */
458         start_pg = pfn_to_page(start_pfn - 1) + 1;
459         end_pg = pfn_to_page(end_pfn - 1) + 1;
460
461         /*
462          * Convert to physical addresses, and
463          * round start upwards and end downwards.
464          */
465         pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
466         pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
467
468         /*
469          * If there are free pages between these,
470          * free the section of the memmap array.
471          */
472         if (pg < pgend)
473                 free_bootmem(pg, pgend - pg);
474 }
475
476 /*
477  * The mem_map array can get very big.  Free the unused area of the memory map.
478  */
479 static void __init free_unused_memmap(struct meminfo *mi)
480 {
481         unsigned long bank_start, prev_bank_end = 0;
482         unsigned int i;
483
484         /*
485          * This relies on each bank being in address order.
486          * The banks are sorted previously in bootmem_init().
487          */
488         for_each_bank(i, mi) {
489                 struct membank *bank = &mi->bank[i];
490
491                 bank_start = bank_pfn_start(bank);
492
493 #ifdef CONFIG_SPARSEMEM
494                 /*
495                  * Take care not to free memmap entries that don't exist
496                  * due to SPARSEMEM sections which aren't present.
497                  */
498                 bank_start = min(bank_start,
499                                  ALIGN(prev_bank_end, PAGES_PER_SECTION));
500 #else
501                 /*
502                  * Align down here since the VM subsystem insists that the
503                  * memmap entries are valid from the bank start aligned to
504                  * MAX_ORDER_NR_PAGES.
505                  */
506                 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
507 #endif
508                 /*
509                  * If we had a previous bank, and there is a space
510                  * between the current bank and the previous, free it.
511                  */
512                 if (prev_bank_end && prev_bank_end < bank_start)
513                         free_memmap(prev_bank_end, bank_start);
514
515                 /*
516                  * Align up here since the VM subsystem insists that the
517                  * memmap entries are valid from the bank end aligned to
518                  * MAX_ORDER_NR_PAGES.
519                  */
520                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
521         }
522
523 #ifdef CONFIG_SPARSEMEM
524         if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
525                 free_memmap(prev_bank_end,
526                             ALIGN(prev_bank_end, PAGES_PER_SECTION));
527 #endif
528 }
529
530 static void __init free_highpages(void)
531 {
532 #ifdef CONFIG_HIGHMEM
533         unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
534         struct memblock_region *mem, *res;
535
536         /* set highmem page free */
537         for_each_memblock(memory, mem) {
538                 unsigned long start = memblock_region_memory_base_pfn(mem);
539                 unsigned long end = memblock_region_memory_end_pfn(mem);
540
541                 /* Ignore complete lowmem entries */
542                 if (end <= max_low)
543                         continue;
544
545                 /* Truncate partial highmem entries */
546                 if (start < max_low)
547                         start = max_low;
548
549                 /* Find and exclude any reserved regions */
550                 for_each_memblock(reserved, res) {
551                         unsigned long res_start, res_end;
552
553                         res_start = memblock_region_reserved_base_pfn(res);
554                         res_end = memblock_region_reserved_end_pfn(res);
555
556                         if (res_end < start)
557                                 continue;
558                         if (res_start < start)
559                                 res_start = start;
560                         if (res_start > end)
561                                 res_start = end;
562                         if (res_end > end)
563                                 res_end = end;
564                         if (res_start != start)
565                                 totalhigh_pages += free_area(start, res_start,
566                                                              NULL);
567                         start = res_end;
568                         if (start == end)
569                                 break;
570                 }
571
572                 /* And now free anything which remains */
573                 if (start < end)
574                         totalhigh_pages += free_area(start, end, NULL);
575         }
576         totalram_pages += totalhigh_pages;
577 #endif
578 }
579
580 /*
581  * mem_init() marks the free areas in the mem_map and tells us how much
582  * memory is free.  This is done after various parts of the system have
583  * claimed their memory after the kernel image.
584  */
585 void __init mem_init(void)
586 {
587         unsigned long reserved_pages, free_pages;
588         struct memblock_region *reg;
589         int i;
590 #ifdef CONFIG_HAVE_TCM
591         /* These pointers are filled in on TCM detection */
592         extern u32 dtcm_end;
593         extern u32 itcm_end;
594 #endif
595
596         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
597
598         /* this will put all unused low memory onto the freelists */
599         free_unused_memmap(&meminfo);
600
601         totalram_pages += free_all_bootmem();
602
603 #ifdef CONFIG_SA1111
604         /* now that our DMA memory is actually so designated, we can free it */
605         totalram_pages += free_area(PHYS_PFN_OFFSET,
606                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
607 #endif
608
609         free_highpages();
610
611         reserved_pages = free_pages = 0;
612
613         for_each_bank(i, &meminfo) {
614                 struct membank *bank = &meminfo.bank[i];
615                 unsigned int pfn1, pfn2;
616                 struct page *page, *end;
617
618                 pfn1 = bank_pfn_start(bank);
619                 pfn2 = bank_pfn_end(bank);
620
621                 page = pfn_to_page(pfn1);
622                 end  = pfn_to_page(pfn2 - 1) + 1;
623
624                 do {
625                         if (PageReserved(page))
626                                 reserved_pages++;
627                         else if (!page_count(page))
628                                 free_pages++;
629                         page++;
630                 } while (page < end);
631         }
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         num_physpages = 0;
639         for_each_memblock(memory, reg) {
640                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
641                         memblock_region_memory_base_pfn(reg);
642                 num_physpages += pages;
643                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
644         }
645         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
646
647         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
648                 nr_free_pages() << (PAGE_SHIFT-10),
649                 free_pages << (PAGE_SHIFT-10),
650                 reserved_pages << (PAGE_SHIFT-10),
651                 totalhigh_pages << (PAGE_SHIFT-10));
652
653 #define MLK(b, t) b, t, ((t) - (b)) >> 10
654 #define MLM(b, t) b, t, ((t) - (b)) >> 20
655 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
656
657         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
658                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
659 #ifdef CONFIG_HAVE_TCM
660                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
661                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
662 #endif
663                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
664                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
665                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
666 #ifdef CONFIG_HIGHMEM
667                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
668 #endif
669                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
670                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
671                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
672                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
673                         "       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",
674
675                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
676                                 (PAGE_SIZE)),
677 #ifdef CONFIG_HAVE_TCM
678                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
679                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
680 #endif
681                         MLK(FIXADDR_START, FIXADDR_TOP),
682                         MLM(VMALLOC_START, VMALLOC_END),
683                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
684 #ifdef CONFIG_HIGHMEM
685                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
686                                 (PAGE_SIZE)),
687 #endif
688                         MLM(MODULES_VADDR, MODULES_END),
689
690                         MLK_ROUNDUP(_text, _etext),
691                         MLK_ROUNDUP(__init_begin, __init_end),
692                         MLK_ROUNDUP(_sdata, _edata),
693                         MLK_ROUNDUP(__bss_start, __bss_stop));
694
695 #undef MLK
696 #undef MLM
697 #undef MLK_ROUNDUP
698
699         /*
700          * Check boundaries twice: Some fundamental inconsistencies can
701          * be detected at build time already.
702          */
703 #ifdef CONFIG_MMU
704         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
705         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
706 #endif
707
708 #ifdef CONFIG_HIGHMEM
709         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
710         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
711 #endif
712
713         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
714                 extern int sysctl_overcommit_memory;
715                 /*
716                  * On a machine this small we won't get
717                  * anywhere without overcommit, so turn
718                  * it on by default.
719                  */
720                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
721         }
722 }
723
724 void free_initmem(void)
725 {
726 #ifdef CONFIG_HAVE_TCM
727         extern char __tcm_start, __tcm_end;
728
729         poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
730         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
731                                     __phys_to_pfn(__pa(&__tcm_end)),
732                                     "TCM link");
733 #endif
734
735         poison_init_mem(__init_begin, __init_end - __init_begin);
736         if (!machine_is_integrator() && !machine_is_cintegrator())
737                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
738                                             __phys_to_pfn(__pa(__init_end)),
739                                             "init");
740 }
741
742 #ifdef CONFIG_BLK_DEV_INITRD
743
744 static int keep_initrd;
745
746 void free_initrd_mem(unsigned long start, unsigned long end)
747 {
748         if (!keep_initrd) {
749                 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
750                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
751                                             __phys_to_pfn(__pa(end)),
752                                             "initrd");
753         }
754 }
755
756 static int __init keepinitrd_setup(char *__unused)
757 {
758         keep_initrd = 1;
759         return 1;
760 }
761
762 __setup("keepinitrd", keepinitrd_setup);
763 #endif