memblock: Fix include breakages caused by 24aa07882b
[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 #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         *min = -1UL;
144         *max_low = *max_high = 0;
145
146         for_each_bank (i, mi) {
147                 struct membank *bank = &mi->bank[i];
148                 unsigned long start, end;
149
150                 start = bank_pfn_start(bank);
151                 end = bank_pfn_end(bank);
152
153                 if (*min > start)
154                         *min = start;
155                 if (*max_high < end)
156                         *max_high = end;
157                 if (bank->highmem)
158                         continue;
159                 if (*max_low < end)
160                         *max_low = end;
161         }
162 }
163
164 static void __init arm_bootmem_init(unsigned long start_pfn,
165         unsigned long end_pfn)
166 {
167         struct memblock_region *reg;
168         unsigned int boot_pages;
169         phys_addr_t bitmap;
170         pg_data_t *pgdat;
171
172         /*
173          * Allocate the bootmem bitmap page.  This must be in a region
174          * of memory which has already been mapped.
175          */
176         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
177         bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
178                                 __pfn_to_phys(end_pfn));
179
180         /*
181          * Initialise the bootmem allocator, handing the
182          * memory banks over to bootmem.
183          */
184         node_set_online(0);
185         pgdat = NODE_DATA(0);
186         init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
187
188         /* Free the lowmem regions from memblock into bootmem. */
189         for_each_memblock(memory, reg) {
190                 unsigned long start = memblock_region_memory_base_pfn(reg);
191                 unsigned long end = memblock_region_memory_end_pfn(reg);
192
193                 if (end >= end_pfn)
194                         end = end_pfn;
195                 if (start >= end)
196                         break;
197
198                 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
199         }
200
201         /* Reserve the lowmem memblock reserved regions in bootmem. */
202         for_each_memblock(reserved, reg) {
203                 unsigned long start = memblock_region_reserved_base_pfn(reg);
204                 unsigned long end = memblock_region_reserved_end_pfn(reg);
205
206                 if (end >= end_pfn)
207                         end = end_pfn;
208                 if (start >= end)
209                         break;
210
211                 reserve_bootmem(__pfn_to_phys(start),
212                                 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
213         }
214 }
215
216 #ifdef CONFIG_ZONE_DMA
217
218 unsigned long arm_dma_zone_size __read_mostly;
219 EXPORT_SYMBOL(arm_dma_zone_size);
220
221 /*
222  * The DMA mask corresponding to the maximum bus address allocatable
223  * using GFP_DMA.  The default here places no restriction on DMA
224  * allocations.  This must be the smallest DMA mask in the system,
225  * so a successful GFP_DMA allocation will always satisfy this.
226  */
227 u32 arm_dma_limit;
228
229 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
230         unsigned long dma_size)
231 {
232         if (size[0] <= dma_size)
233                 return;
234
235         size[ZONE_NORMAL] = size[0] - dma_size;
236         size[ZONE_DMA] = dma_size;
237         hole[ZONE_NORMAL] = hole[0];
238         hole[ZONE_DMA] = 0;
239 }
240 #endif
241
242 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
243         unsigned long max_high)
244 {
245         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
246         struct memblock_region *reg;
247
248         /*
249          * initialise the zones.
250          */
251         memset(zone_size, 0, sizeof(zone_size));
252
253         /*
254          * The memory size has already been determined.  If we need
255          * to do anything fancy with the allocation of this memory
256          * to the zones, now is the time to do it.
257          */
258         zone_size[0] = max_low - min;
259 #ifdef CONFIG_HIGHMEM
260         zone_size[ZONE_HIGHMEM] = max_high - max_low;
261 #endif
262
263         /*
264          * Calculate the size of the holes.
265          *  holes = node_size - sum(bank_sizes)
266          */
267         memcpy(zhole_size, zone_size, sizeof(zhole_size));
268         for_each_memblock(memory, reg) {
269                 unsigned long start = memblock_region_memory_base_pfn(reg);
270                 unsigned long end = memblock_region_memory_end_pfn(reg);
271
272                 if (start < max_low) {
273                         unsigned long low_end = min(end, max_low);
274                         zhole_size[0] -= low_end - start;
275                 }
276 #ifdef CONFIG_HIGHMEM
277                 if (end > max_low) {
278                         unsigned long high_start = max(start, max_low);
279                         zhole_size[ZONE_HIGHMEM] -= end - high_start;
280                 }
281 #endif
282         }
283
284 #ifdef CONFIG_ZONE_DMA
285         /*
286          * Adjust the sizes according to any special requirements for
287          * this machine type.
288          */
289         if (arm_dma_zone_size) {
290                 arm_adjust_dma_zone(zone_size, zhole_size,
291                         arm_dma_zone_size >> PAGE_SHIFT);
292                 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
293         } else
294                 arm_dma_limit = 0xffffffff;
295 #endif
296
297         free_area_init_node(0, zone_size, min, zhole_size);
298 }
299
300 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
301 int pfn_valid(unsigned long pfn)
302 {
303         return memblock_is_memory(__pfn_to_phys(pfn));
304 }
305 EXPORT_SYMBOL(pfn_valid);
306 #endif
307
308 #ifndef CONFIG_SPARSEMEM
309 static void arm_memory_present(void)
310 {
311 }
312 #else
313 static void arm_memory_present(void)
314 {
315         struct memblock_region *reg;
316
317         for_each_memblock(memory, reg)
318                 memory_present(0, memblock_region_memory_base_pfn(reg),
319                                memblock_region_memory_end_pfn(reg));
320 }
321 #endif
322
323 static int __init meminfo_cmp(const void *_a, const void *_b)
324 {
325         const struct membank *a = _a, *b = _b;
326         long cmp = bank_pfn_start(a) - bank_pfn_start(b);
327         return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
328 }
329
330 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
331 {
332         int i;
333
334         sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
335
336         memblock_init();
337         for (i = 0; i < mi->nr_banks; i++)
338                 memblock_add(mi->bank[i].start, mi->bank[i].size);
339
340         /* Register the kernel text, kernel data and initrd with memblock. */
341 #ifdef CONFIG_XIP_KERNEL
342         memblock_reserve(__pa(_sdata), _end - _sdata);
343 #else
344         memblock_reserve(__pa(_stext), _end - _stext);
345 #endif
346 #ifdef CONFIG_BLK_DEV_INITRD
347         if (phys_initrd_size &&
348             !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
349                 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n",
350                        phys_initrd_start, phys_initrd_size);
351                 phys_initrd_start = phys_initrd_size = 0;
352         }
353         if (phys_initrd_size &&
354             memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
355                 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
356                        phys_initrd_start, phys_initrd_size);
357                 phys_initrd_start = phys_initrd_size = 0;
358         }
359         if (phys_initrd_size) {
360                 memblock_reserve(phys_initrd_start, phys_initrd_size);
361
362                 /* Now convert initrd to virtual addresses */
363                 initrd_start = __phys_to_virt(phys_initrd_start);
364                 initrd_end = initrd_start + phys_initrd_size;
365         }
366 #endif
367
368         arm_mm_memblock_reserve();
369         arm_dt_memblock_reserve();
370
371         /* reserve any platform specific memblock areas */
372         if (mdesc->reserve)
373                 mdesc->reserve();
374
375         memblock_analyze();
376         memblock_dump_all();
377 }
378
379 void __init bootmem_init(void)
380 {
381         unsigned long min, max_low, max_high;
382
383         max_low = max_high = 0;
384
385         find_limits(&min, &max_low, &max_high);
386
387         arm_bootmem_init(min, max_low);
388
389         /*
390          * Sparsemem tries to allocate bootmem in memory_present(),
391          * so must be done after the fixed reservations
392          */
393         arm_memory_present();
394
395         /*
396          * sparse_init() needs the bootmem allocator up and running.
397          */
398         sparse_init();
399
400         /*
401          * Now free the memory - free_area_init_node needs
402          * the sparse mem_map arrays initialized by sparse_init()
403          * for memmap_init_zone(), otherwise all PFNs are invalid.
404          */
405         arm_bootmem_free(min, max_low, max_high);
406
407         high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1;
408
409         /*
410          * This doesn't seem to be used by the Linux memory manager any
411          * more, but is used by ll_rw_block.  If we can get rid of it, we
412          * also get rid of some of the stuff above as well.
413          *
414          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
415          * the system, not the maximum PFN.
416          */
417         max_low_pfn = max_low - PHYS_PFN_OFFSET;
418         max_pfn = max_high - PHYS_PFN_OFFSET;
419 }
420
421 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
422 {
423         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
424
425         for (; pfn < end; pfn++) {
426                 struct page *page = pfn_to_page(pfn);
427                 ClearPageReserved(page);
428                 init_page_count(page);
429                 __free_page(page);
430                 pages++;
431         }
432
433         if (size && s)
434                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
435
436         return pages;
437 }
438
439 /*
440  * Poison init memory with an undefined instruction (ARM) or a branch to an
441  * undefined instruction (Thumb).
442  */
443 static inline void poison_init_mem(void *s, size_t count)
444 {
445         u32 *p = (u32 *)s;
446         for (; count != 0; count -= 4)
447                 *p++ = 0xe7fddef0;
448 }
449
450 static inline void
451 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
452 {
453         struct page *start_pg, *end_pg;
454         unsigned long pg, pgend;
455
456         /*
457          * Convert start_pfn/end_pfn to a struct page pointer.
458          */
459         start_pg = pfn_to_page(start_pfn - 1) + 1;
460         end_pg = pfn_to_page(end_pfn - 1) + 1;
461
462         /*
463          * Convert to physical addresses, and
464          * round start upwards and end downwards.
465          */
466         pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
467         pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
468
469         /*
470          * If there are free pages between these,
471          * free the section of the memmap array.
472          */
473         if (pg < pgend)
474                 free_bootmem(pg, pgend - pg);
475 }
476
477 /*
478  * The mem_map array can get very big.  Free the unused area of the memory map.
479  */
480 static void __init free_unused_memmap(struct meminfo *mi)
481 {
482         unsigned long bank_start, prev_bank_end = 0;
483         unsigned int i;
484
485         /*
486          * This relies on each bank being in address order.
487          * The banks are sorted previously in bootmem_init().
488          */
489         for_each_bank(i, mi) {
490                 struct membank *bank = &mi->bank[i];
491
492                 bank_start = bank_pfn_start(bank);
493
494 #ifdef CONFIG_SPARSEMEM
495                 /*
496                  * Take care not to free memmap entries that don't exist
497                  * due to SPARSEMEM sections which aren't present.
498                  */
499                 bank_start = min(bank_start,
500                                  ALIGN(prev_bank_end, PAGES_PER_SECTION));
501 #else
502                 /*
503                  * Align down here since the VM subsystem insists that the
504                  * memmap entries are valid from the bank start aligned to
505                  * MAX_ORDER_NR_PAGES.
506                  */
507                 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
508 #endif
509                 /*
510                  * If we had a previous bank, and there is a space
511                  * between the current bank and the previous, free it.
512                  */
513                 if (prev_bank_end && prev_bank_end < bank_start)
514                         free_memmap(prev_bank_end, bank_start);
515
516                 /*
517                  * Align up here since the VM subsystem insists that the
518                  * memmap entries are valid from the bank end aligned to
519                  * MAX_ORDER_NR_PAGES.
520                  */
521                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
522         }
523
524 #ifdef CONFIG_SPARSEMEM
525         if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
526                 free_memmap(prev_bank_end,
527                             ALIGN(prev_bank_end, PAGES_PER_SECTION));
528 #endif
529 }
530
531 static void __init free_highpages(void)
532 {
533 #ifdef CONFIG_HIGHMEM
534         unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
535         struct memblock_region *mem, *res;
536
537         /* set highmem page free */
538         for_each_memblock(memory, mem) {
539                 unsigned long start = memblock_region_memory_base_pfn(mem);
540                 unsigned long end = memblock_region_memory_end_pfn(mem);
541
542                 /* Ignore complete lowmem entries */
543                 if (end <= max_low)
544                         continue;
545
546                 /* Truncate partial highmem entries */
547                 if (start < max_low)
548                         start = max_low;
549
550                 /* Find and exclude any reserved regions */
551                 for_each_memblock(reserved, res) {
552                         unsigned long res_start, res_end;
553
554                         res_start = memblock_region_reserved_base_pfn(res);
555                         res_end = memblock_region_reserved_end_pfn(res);
556
557                         if (res_end < start)
558                                 continue;
559                         if (res_start < start)
560                                 res_start = start;
561                         if (res_start > end)
562                                 res_start = end;
563                         if (res_end > end)
564                                 res_end = end;
565                         if (res_start != start)
566                                 totalhigh_pages += free_area(start, res_start,
567                                                              NULL);
568                         start = res_end;
569                         if (start == end)
570                                 break;
571                 }
572
573                 /* And now free anything which remains */
574                 if (start < end)
575                         totalhigh_pages += free_area(start, end, NULL);
576         }
577         totalram_pages += totalhigh_pages;
578 #endif
579 }
580
581 /*
582  * mem_init() marks the free areas in the mem_map and tells us how much
583  * memory is free.  This is done after various parts of the system have
584  * claimed their memory after the kernel image.
585  */
586 void __init mem_init(void)
587 {
588         unsigned long reserved_pages, free_pages;
589         struct memblock_region *reg;
590         int i;
591 #ifdef CONFIG_HAVE_TCM
592         /* These pointers are filled in on TCM detection */
593         extern u32 dtcm_end;
594         extern u32 itcm_end;
595 #endif
596
597         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
598
599         /* this will put all unused low memory onto the freelists */
600         free_unused_memmap(&meminfo);
601
602         totalram_pages += free_all_bootmem();
603
604 #ifdef CONFIG_SA1111
605         /* now that our DMA memory is actually so designated, we can free it */
606         totalram_pages += free_area(PHYS_PFN_OFFSET,
607                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
608 #endif
609
610         free_highpages();
611
612         reserved_pages = free_pages = 0;
613
614         for_each_bank(i, &meminfo) {
615                 struct membank *bank = &meminfo.bank[i];
616                 unsigned int pfn1, pfn2;
617                 struct page *page, *end;
618
619                 pfn1 = bank_pfn_start(bank);
620                 pfn2 = bank_pfn_end(bank);
621
622                 page = pfn_to_page(pfn1);
623                 end  = pfn_to_page(pfn2 - 1) + 1;
624
625                 do {
626                         if (PageReserved(page))
627                                 reserved_pages++;
628                         else if (!page_count(page))
629                                 free_pages++;
630                         page++;
631                 } while (page < end);
632         }
633
634         /*
635          * Since our memory may not be contiguous, calculate the
636          * real number of pages we have in this system
637          */
638         printk(KERN_INFO "Memory:");
639         num_physpages = 0;
640         for_each_memblock(memory, reg) {
641                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
642                         memblock_region_memory_base_pfn(reg);
643                 num_physpages += pages;
644                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
645         }
646         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
647
648         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
649                 nr_free_pages() << (PAGE_SHIFT-10),
650                 free_pages << (PAGE_SHIFT-10),
651                 reserved_pages << (PAGE_SHIFT-10),
652                 totalhigh_pages << (PAGE_SHIFT-10));
653
654 #define MLK(b, t) b, t, ((t) - (b)) >> 10
655 #define MLM(b, t) b, t, ((t) - (b)) >> 20
656 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
657
658         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
659                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
660 #ifdef CONFIG_HAVE_TCM
661                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
662                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
663 #endif
664                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
665                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
666                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
667 #ifdef CONFIG_HIGHMEM
668                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
669 #endif
670                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
671                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
672                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
673                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
674                         "       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",
675
676                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
677                                 (PAGE_SIZE)),
678 #ifdef CONFIG_HAVE_TCM
679                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
680                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
681 #endif
682                         MLK(FIXADDR_START, FIXADDR_TOP),
683                         MLM(VMALLOC_START, VMALLOC_END),
684                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
685 #ifdef CONFIG_HIGHMEM
686                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
687                                 (PAGE_SIZE)),
688 #endif
689                         MLM(MODULES_VADDR, MODULES_END),
690
691                         MLK_ROUNDUP(_text, _etext),
692                         MLK_ROUNDUP(__init_begin, __init_end),
693                         MLK_ROUNDUP(_sdata, _edata),
694                         MLK_ROUNDUP(__bss_start, __bss_stop));
695
696 #undef MLK
697 #undef MLM
698 #undef MLK_ROUNDUP
699
700         /*
701          * Check boundaries twice: Some fundamental inconsistencies can
702          * be detected at build time already.
703          */
704 #ifdef CONFIG_MMU
705         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
706         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
707 #endif
708
709 #ifdef CONFIG_HIGHMEM
710         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
711         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
712 #endif
713
714         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
715                 extern int sysctl_overcommit_memory;
716                 /*
717                  * On a machine this small we won't get
718                  * anywhere without overcommit, so turn
719                  * it on by default.
720                  */
721                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
722         }
723 }
724
725 void free_initmem(void)
726 {
727 #ifdef CONFIG_HAVE_TCM
728         extern char __tcm_start, __tcm_end;
729
730         poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
731         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
732                                     __phys_to_pfn(__pa(&__tcm_end)),
733                                     "TCM link");
734 #endif
735
736         poison_init_mem(__init_begin, __init_end - __init_begin);
737         if (!machine_is_integrator() && !machine_is_cintegrator())
738                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
739                                             __phys_to_pfn(__pa(__init_end)),
740                                             "init");
741 }
742
743 #ifdef CONFIG_BLK_DEV_INITRD
744
745 static int keep_initrd;
746
747 void free_initrd_mem(unsigned long start, unsigned long end)
748 {
749         if (!keep_initrd) {
750                 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
751                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
752                                             __phys_to_pfn(__pa(end)),
753                                             "initrd");
754         }
755 }
756
757 static int __init keepinitrd_setup(char *__unused)
758 {
759         keep_initrd = 1;
760         return 1;
761 }
762
763 __setup("keepinitrd", keepinitrd_setup);
764 #endif