4a8a01e0c3ab3148d708f7378c0abdadc9c799e6
[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/nodemask.h>
17 #include <linux/initrd.h>
18 #include <linux/of_fdt.h>
19 #include <linux/highmem.h>
20 #include <linux/gfp.h>
21 #include <linux/memblock.h>
22 #include <linux/sort.h>
23
24 #include <asm/mach-types.h>
25 #include <asm/prom.h>
26 #include <asm/sections.h>
27 #include <asm/setup.h>
28 #include <asm/sizes.h>
29 #include <asm/tlb.h>
30 #include <asm/fixmap.h>
31 #include <asm/memory.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 #ifdef ARM_DMA_ZONE_SIZE
218 unsigned long arm_dma_zone_size = ARM_DMA_ZONE_SIZE;
219 #else
220 unsigned long arm_dma_zone_size __read_mostly;
221 #endif
222 EXPORT_SYMBOL(arm_dma_zone_size);
223
224 /*
225  * The DMA mask corresponding to the maximum bus address allocatable
226  * using GFP_DMA.  The default here places no restriction on DMA
227  * allocations.  This must be the smallest DMA mask in the system,
228  * so a successful GFP_DMA allocation will always satisfy this.
229  */
230 u32 arm_dma_limit;
231
232 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
233         unsigned long dma_size)
234 {
235         if (size[0] <= dma_size)
236                 return;
237
238         size[ZONE_NORMAL] = size[0] - dma_size;
239         size[ZONE_DMA] = dma_size;
240         hole[ZONE_NORMAL] = hole[0];
241         hole[ZONE_DMA] = 0;
242 }
243 #endif
244
245 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
246         unsigned long max_high)
247 {
248         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
249         struct memblock_region *reg;
250
251         /*
252          * initialise the zones.
253          */
254         memset(zone_size, 0, sizeof(zone_size));
255
256         /*
257          * The memory size has already been determined.  If we need
258          * to do anything fancy with the allocation of this memory
259          * to the zones, now is the time to do it.
260          */
261         zone_size[0] = max_low - min;
262 #ifdef CONFIG_HIGHMEM
263         zone_size[ZONE_HIGHMEM] = max_high - max_low;
264 #endif
265
266         /*
267          * Calculate the size of the holes.
268          *  holes = node_size - sum(bank_sizes)
269          */
270         memcpy(zhole_size, zone_size, sizeof(zhole_size));
271         for_each_memblock(memory, reg) {
272                 unsigned long start = memblock_region_memory_base_pfn(reg);
273                 unsigned long end = memblock_region_memory_end_pfn(reg);
274
275                 if (start < max_low) {
276                         unsigned long low_end = min(end, max_low);
277                         zhole_size[0] -= low_end - start;
278                 }
279 #ifdef CONFIG_HIGHMEM
280                 if (end > max_low) {
281                         unsigned long high_start = max(start, max_low);
282                         zhole_size[ZONE_HIGHMEM] -= end - high_start;
283                 }
284 #endif
285         }
286
287 #ifdef CONFIG_ZONE_DMA
288         /*
289          * Adjust the sizes according to any special requirements for
290          * this machine type.
291          */
292         if (arm_dma_zone_size) {
293                 arm_adjust_dma_zone(zone_size, zhole_size,
294                         arm_dma_zone_size >> PAGE_SHIFT);
295                 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
296         } else
297                 arm_dma_limit = 0xffffffff;
298 #endif
299
300         free_area_init_node(0, zone_size, min, zhole_size);
301 }
302
303 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
304 int pfn_valid(unsigned long pfn)
305 {
306         return memblock_is_memory(pfn << PAGE_SHIFT);
307 }
308 EXPORT_SYMBOL(pfn_valid);
309 #endif
310
311 #ifndef CONFIG_SPARSEMEM
312 static void arm_memory_present(void)
313 {
314 }
315 #else
316 static void arm_memory_present(void)
317 {
318         struct memblock_region *reg;
319
320         for_each_memblock(memory, reg)
321                 memory_present(0, memblock_region_memory_base_pfn(reg),
322                                memblock_region_memory_end_pfn(reg));
323 }
324 #endif
325
326 static int __init meminfo_cmp(const void *_a, const void *_b)
327 {
328         const struct membank *a = _a, *b = _b;
329         long cmp = bank_pfn_start(a) - bank_pfn_start(b);
330         return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
331 }
332
333 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
334 {
335         int i;
336
337         sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
338
339         memblock_init();
340         for (i = 0; i < mi->nr_banks; i++)
341                 memblock_add(mi->bank[i].start, mi->bank[i].size);
342
343         /* Register the kernel text, kernel data and initrd with memblock. */
344 #ifdef CONFIG_XIP_KERNEL
345         memblock_reserve(__pa(_sdata), _end - _sdata);
346 #else
347         memblock_reserve(__pa(_stext), _end - _stext);
348 #endif
349 #ifdef CONFIG_BLK_DEV_INITRD
350         if (phys_initrd_size &&
351             !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
352                 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n",
353                        phys_initrd_start, phys_initrd_size);
354                 phys_initrd_start = phys_initrd_size = 0;
355         }
356         if (phys_initrd_size &&
357             memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
358                 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
359                        phys_initrd_start, phys_initrd_size);
360                 phys_initrd_start = phys_initrd_size = 0;
361         }
362         if (phys_initrd_size) {
363                 memblock_reserve(phys_initrd_start, phys_initrd_size);
364
365                 /* Now convert initrd to virtual addresses */
366                 initrd_start = __phys_to_virt(phys_initrd_start);
367                 initrd_end = initrd_start + phys_initrd_size;
368         }
369 #endif
370
371         arm_mm_memblock_reserve();
372         arm_dt_memblock_reserve();
373
374         /* reserve any platform specific memblock areas */
375         if (mdesc->reserve)
376                 mdesc->reserve();
377
378         memblock_analyze();
379         memblock_dump_all();
380 }
381
382 void __init bootmem_init(void)
383 {
384         unsigned long min, max_low, max_high;
385
386         max_low = max_high = 0;
387
388         find_limits(&min, &max_low, &max_high);
389
390         arm_bootmem_init(min, max_low);
391
392         /*
393          * Sparsemem tries to allocate bootmem in memory_present(),
394          * so must be done after the fixed reservations
395          */
396         arm_memory_present();
397
398         /*
399          * sparse_init() needs the bootmem allocator up and running.
400          */
401         sparse_init();
402
403         /*
404          * Now free the memory - free_area_init_node needs
405          * the sparse mem_map arrays initialized by sparse_init()
406          * for memmap_init_zone(), otherwise all PFNs are invalid.
407          */
408         arm_bootmem_free(min, max_low, max_high);
409
410         high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1;
411
412         /*
413          * This doesn't seem to be used by the Linux memory manager any
414          * more, but is used by ll_rw_block.  If we can get rid of it, we
415          * also get rid of some of the stuff above as well.
416          *
417          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
418          * the system, not the maximum PFN.
419          */
420         max_low_pfn = max_low - PHYS_PFN_OFFSET;
421         max_pfn = max_high - PHYS_PFN_OFFSET;
422 }
423
424 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
425 {
426         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
427
428         for (; pfn < end; pfn++) {
429                 struct page *page = pfn_to_page(pfn);
430                 ClearPageReserved(page);
431                 init_page_count(page);
432                 __free_page(page);
433                 pages++;
434         }
435
436         if (size && s)
437                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
438
439         return pages;
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 #endif
494                 /*
495                  * If we had a previous bank, and there is a space
496                  * between the current bank and the previous, free it.
497                  */
498                 if (prev_bank_end && prev_bank_end < bank_start)
499                         free_memmap(prev_bank_end, bank_start);
500
501                 /*
502                  * Align up here since the VM subsystem insists that the
503                  * memmap entries are valid from the bank end aligned to
504                  * MAX_ORDER_NR_PAGES.
505                  */
506                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
507         }
508
509 #ifdef CONFIG_SPARSEMEM
510         if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
511                 free_memmap(prev_bank_end,
512                             ALIGN(prev_bank_end, PAGES_PER_SECTION));
513 #endif
514 }
515
516 static void __init free_highpages(void)
517 {
518 #ifdef CONFIG_HIGHMEM
519         unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
520         struct memblock_region *mem, *res;
521
522         /* set highmem page free */
523         for_each_memblock(memory, mem) {
524                 unsigned long start = memblock_region_memory_base_pfn(mem);
525                 unsigned long end = memblock_region_memory_end_pfn(mem);
526
527                 /* Ignore complete lowmem entries */
528                 if (end <= max_low)
529                         continue;
530
531                 /* Truncate partial highmem entries */
532                 if (start < max_low)
533                         start = max_low;
534
535                 /* Find and exclude any reserved regions */
536                 for_each_memblock(reserved, res) {
537                         unsigned long res_start, res_end;
538
539                         res_start = memblock_region_reserved_base_pfn(res);
540                         res_end = memblock_region_reserved_end_pfn(res);
541
542                         if (res_end < start)
543                                 continue;
544                         if (res_start < start)
545                                 res_start = start;
546                         if (res_start > end)
547                                 res_start = end;
548                         if (res_end > end)
549                                 res_end = end;
550                         if (res_start != start)
551                                 totalhigh_pages += free_area(start, res_start,
552                                                              NULL);
553                         start = res_end;
554                         if (start == end)
555                                 break;
556                 }
557
558                 /* And now free anything which remains */
559                 if (start < end)
560                         totalhigh_pages += free_area(start, end, NULL);
561         }
562         totalram_pages += totalhigh_pages;
563 #endif
564 }
565
566 /*
567  * mem_init() marks the free areas in the mem_map and tells us how much
568  * memory is free.  This is done after various parts of the system have
569  * claimed their memory after the kernel image.
570  */
571 void __init mem_init(void)
572 {
573         unsigned long reserved_pages, free_pages;
574         struct memblock_region *reg;
575         int i;
576 #ifdef CONFIG_HAVE_TCM
577         /* These pointers are filled in on TCM detection */
578         extern u32 dtcm_end;
579         extern u32 itcm_end;
580 #endif
581
582         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
583
584         /* this will put all unused low memory onto the freelists */
585         free_unused_memmap(&meminfo);
586
587         totalram_pages += free_all_bootmem();
588
589 #ifdef CONFIG_SA1111
590         /* now that our DMA memory is actually so designated, we can free it */
591         totalram_pages += free_area(PHYS_PFN_OFFSET,
592                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
593 #endif
594
595         free_highpages();
596
597         reserved_pages = free_pages = 0;
598
599         for_each_bank(i, &meminfo) {
600                 struct membank *bank = &meminfo.bank[i];
601                 unsigned int pfn1, pfn2;
602                 struct page *page, *end;
603
604                 pfn1 = bank_pfn_start(bank);
605                 pfn2 = bank_pfn_end(bank);
606
607                 page = pfn_to_page(pfn1);
608                 end  = pfn_to_page(pfn2 - 1) + 1;
609
610                 do {
611                         if (PageReserved(page))
612                                 reserved_pages++;
613                         else if (!page_count(page))
614                                 free_pages++;
615                         page++;
616                 } while (page < end);
617         }
618
619         /*
620          * Since our memory may not be contiguous, calculate the
621          * real number of pages we have in this system
622          */
623         printk(KERN_INFO "Memory:");
624         num_physpages = 0;
625         for_each_memblock(memory, reg) {
626                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
627                         memblock_region_memory_base_pfn(reg);
628                 num_physpages += pages;
629                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
630         }
631         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
632
633         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
634                 nr_free_pages() << (PAGE_SHIFT-10),
635                 free_pages << (PAGE_SHIFT-10),
636                 reserved_pages << (PAGE_SHIFT-10),
637                 totalhigh_pages << (PAGE_SHIFT-10));
638
639 #define MLK(b, t) b, t, ((t) - (b)) >> 10
640 #define MLM(b, t) b, t, ((t) - (b)) >> 20
641 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
642
643         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
644                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
645 #ifdef CONFIG_HAVE_TCM
646                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
647                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
648 #endif
649                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
650 #ifdef CONFIG_MMU
651                         "    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
652 #endif
653                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
654                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
655 #ifdef CONFIG_HIGHMEM
656                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
657 #endif
658                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
659                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
660                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
661                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
662                         "       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",
663
664                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
665                                 (PAGE_SIZE)),
666 #ifdef CONFIG_HAVE_TCM
667                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
668                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
669 #endif
670                         MLK(FIXADDR_START, FIXADDR_TOP),
671 #ifdef CONFIG_MMU
672                         MLM(CONSISTENT_BASE, CONSISTENT_END),
673 #endif
674                         MLM(VMALLOC_START, VMALLOC_END),
675                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
676 #ifdef CONFIG_HIGHMEM
677                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
678                                 (PAGE_SIZE)),
679 #endif
680                         MLM(MODULES_VADDR, MODULES_END),
681
682                         MLK_ROUNDUP(__init_begin, __init_end),
683                         MLK_ROUNDUP(_text, _etext),
684                         MLK_ROUNDUP(_sdata, _edata),
685                         MLK_ROUNDUP(__bss_start, __bss_stop));
686
687 #undef MLK
688 #undef MLM
689 #undef MLK_ROUNDUP
690
691         /*
692          * Check boundaries twice: Some fundamental inconsistencies can
693          * be detected at build time already.
694          */
695 #ifdef CONFIG_MMU
696         BUILD_BUG_ON(VMALLOC_END                        > CONSISTENT_BASE);
697         BUG_ON(VMALLOC_END                              > CONSISTENT_BASE);
698
699         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
700         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
701 #endif
702
703 #ifdef CONFIG_HIGHMEM
704         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
705         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
706 #endif
707
708         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
709                 extern int sysctl_overcommit_memory;
710                 /*
711                  * On a machine this small we won't get
712                  * anywhere without overcommit, so turn
713                  * it on by default.
714                  */
715                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
716         }
717 }
718
719 void free_initmem(void)
720 {
721 #ifdef CONFIG_HAVE_TCM
722         extern char __tcm_start, __tcm_end;
723
724         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
725                                     __phys_to_pfn(__pa(&__tcm_end)),
726                                     "TCM link");
727 #endif
728
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                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
743                                             __phys_to_pfn(__pa(end)),
744                                             "initrd");
745 }
746
747 static int __init keepinitrd_setup(char *__unused)
748 {
749         keep_initrd = 1;
750         return 1;
751 }
752
753 __setup("keepinitrd", keepinitrd_setup);
754 #endif