Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-fixes
[firefly-linux-kernel-4.4.55.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
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         /* This assumes the meminfo array is properly sorted */
143         *min = bank_pfn_start(&mi->bank[0]);
144         for_each_bank (i, mi)
145                 if (mi->bank[i].highmem)
146                                 break;
147         *max_low = bank_pfn_end(&mi->bank[i - 1]);
148         *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]);
149 }
150
151 static void __init arm_bootmem_init(unsigned long start_pfn,
152         unsigned long end_pfn)
153 {
154         struct memblock_region *reg;
155         unsigned int boot_pages;
156         phys_addr_t bitmap;
157         pg_data_t *pgdat;
158
159         /*
160          * Allocate the bootmem bitmap page.  This must be in a region
161          * of memory which has already been mapped.
162          */
163         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
164         bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
165                                 __pfn_to_phys(end_pfn));
166
167         /*
168          * Initialise the bootmem allocator, handing the
169          * memory banks over to bootmem.
170          */
171         node_set_online(0);
172         pgdat = NODE_DATA(0);
173         init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
174
175         /* Free the lowmem regions from memblock into bootmem. */
176         for_each_memblock(memory, reg) {
177                 unsigned long start = memblock_region_memory_base_pfn(reg);
178                 unsigned long end = memblock_region_memory_end_pfn(reg);
179
180                 if (end >= end_pfn)
181                         end = end_pfn;
182                 if (start >= end)
183                         break;
184
185                 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
186         }
187
188         /* Reserve the lowmem memblock reserved regions in bootmem. */
189         for_each_memblock(reserved, reg) {
190                 unsigned long start = memblock_region_reserved_base_pfn(reg);
191                 unsigned long end = memblock_region_reserved_end_pfn(reg);
192
193                 if (end >= end_pfn)
194                         end = end_pfn;
195                 if (start >= end)
196                         break;
197
198                 reserve_bootmem(__pfn_to_phys(start),
199                                 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
200         }
201 }
202
203 #ifdef CONFIG_ZONE_DMA
204
205 unsigned long arm_dma_zone_size __read_mostly;
206 EXPORT_SYMBOL(arm_dma_zone_size);
207
208 /*
209  * The DMA mask corresponding to the maximum bus address allocatable
210  * using GFP_DMA.  The default here places no restriction on DMA
211  * allocations.  This must be the smallest DMA mask in the system,
212  * so a successful GFP_DMA allocation will always satisfy this.
213  */
214 u32 arm_dma_limit;
215
216 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
217         unsigned long dma_size)
218 {
219         if (size[0] <= dma_size)
220                 return;
221
222         size[ZONE_NORMAL] = size[0] - dma_size;
223         size[ZONE_DMA] = dma_size;
224         hole[ZONE_NORMAL] = hole[0];
225         hole[ZONE_DMA] = 0;
226 }
227 #endif
228
229 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
230         unsigned long max_high)
231 {
232         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
233         struct memblock_region *reg;
234
235         /*
236          * initialise the zones.
237          */
238         memset(zone_size, 0, sizeof(zone_size));
239
240         /*
241          * The memory size has already been determined.  If we need
242          * to do anything fancy with the allocation of this memory
243          * to the zones, now is the time to do it.
244          */
245         zone_size[0] = max_low - min;
246 #ifdef CONFIG_HIGHMEM
247         zone_size[ZONE_HIGHMEM] = max_high - max_low;
248 #endif
249
250         /*
251          * Calculate the size of the holes.
252          *  holes = node_size - sum(bank_sizes)
253          */
254         memcpy(zhole_size, zone_size, sizeof(zhole_size));
255         for_each_memblock(memory, reg) {
256                 unsigned long start = memblock_region_memory_base_pfn(reg);
257                 unsigned long end = memblock_region_memory_end_pfn(reg);
258
259                 if (start < max_low) {
260                         unsigned long low_end = min(end, max_low);
261                         zhole_size[0] -= low_end - start;
262                 }
263 #ifdef CONFIG_HIGHMEM
264                 if (end > max_low) {
265                         unsigned long high_start = max(start, max_low);
266                         zhole_size[ZONE_HIGHMEM] -= end - high_start;
267                 }
268 #endif
269         }
270
271 #ifdef CONFIG_ZONE_DMA
272         /*
273          * Adjust the sizes according to any special requirements for
274          * this machine type.
275          */
276         if (arm_dma_zone_size) {
277                 arm_adjust_dma_zone(zone_size, zhole_size,
278                         arm_dma_zone_size >> PAGE_SHIFT);
279                 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
280         } else
281                 arm_dma_limit = 0xffffffff;
282 #endif
283
284         free_area_init_node(0, zone_size, min, zhole_size);
285 }
286
287 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
288 int pfn_valid(unsigned long pfn)
289 {
290         return memblock_is_memory(__pfn_to_phys(pfn));
291 }
292 EXPORT_SYMBOL(pfn_valid);
293 #endif
294
295 #ifndef CONFIG_SPARSEMEM
296 static void arm_memory_present(void)
297 {
298 }
299 #else
300 static void arm_memory_present(void)
301 {
302         struct memblock_region *reg;
303
304         for_each_memblock(memory, reg)
305                 memory_present(0, memblock_region_memory_base_pfn(reg),
306                                memblock_region_memory_end_pfn(reg));
307 }
308 #endif
309
310 static bool arm_memblock_steal_permitted = true;
311
312 phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
313 {
314         phys_addr_t phys;
315
316         BUG_ON(!arm_memblock_steal_permitted);
317
318         phys = memblock_alloc(size, align);
319         memblock_free(phys, size);
320         memblock_remove(phys, size);
321
322         return phys;
323 }
324
325 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
326 {
327         int i;
328
329         for (i = 0; i < mi->nr_banks; i++)
330                 memblock_add(mi->bank[i].start, mi->bank[i].size);
331
332         /* Register the kernel text, kernel data and initrd with memblock. */
333 #ifdef CONFIG_XIP_KERNEL
334         memblock_reserve(__pa(_sdata), _end - _sdata);
335 #else
336         memblock_reserve(__pa(_stext), _end - _stext);
337 #endif
338 #ifdef CONFIG_BLK_DEV_INITRD
339         if (phys_initrd_size &&
340             !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
341                 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n",
342                        phys_initrd_start, phys_initrd_size);
343                 phys_initrd_start = phys_initrd_size = 0;
344         }
345         if (phys_initrd_size &&
346             memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
347                 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
348                        phys_initrd_start, phys_initrd_size);
349                 phys_initrd_start = phys_initrd_size = 0;
350         }
351         if (phys_initrd_size) {
352                 memblock_reserve(phys_initrd_start, phys_initrd_size);
353
354                 /* Now convert initrd to virtual addresses */
355                 initrd_start = __phys_to_virt(phys_initrd_start);
356                 initrd_end = initrd_start + phys_initrd_size;
357         }
358 #endif
359
360         arm_mm_memblock_reserve();
361         arm_dt_memblock_reserve();
362
363         /* reserve any platform specific memblock areas */
364         if (mdesc->reserve)
365                 mdesc->reserve();
366
367         arm_memblock_steal_permitted = false;
368         memblock_allow_resize();
369         memblock_dump_all();
370 }
371
372 void __init bootmem_init(void)
373 {
374         unsigned long min, max_low, max_high;
375
376         max_low = max_high = 0;
377
378         find_limits(&min, &max_low, &max_high);
379
380         arm_bootmem_init(min, max_low);
381
382         /*
383          * Sparsemem tries to allocate bootmem in memory_present(),
384          * so must be done after the fixed reservations
385          */
386         arm_memory_present();
387
388         /*
389          * sparse_init() needs the bootmem allocator up and running.
390          */
391         sparse_init();
392
393         /*
394          * Now free the memory - free_area_init_node needs
395          * the sparse mem_map arrays initialized by sparse_init()
396          * for memmap_init_zone(), otherwise all PFNs are invalid.
397          */
398         arm_bootmem_free(min, max_low, max_high);
399
400         /*
401          * This doesn't seem to be used by the Linux memory manager any
402          * more, but is used by ll_rw_block.  If we can get rid of it, we
403          * also get rid of some of the stuff above as well.
404          *
405          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
406          * the system, not the maximum PFN.
407          */
408         max_low_pfn = max_low - PHYS_PFN_OFFSET;
409         max_pfn = max_high - PHYS_PFN_OFFSET;
410 }
411
412 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
413 {
414         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
415
416         for (; pfn < end; pfn++) {
417                 struct page *page = pfn_to_page(pfn);
418                 ClearPageReserved(page);
419                 init_page_count(page);
420                 __free_page(page);
421                 pages++;
422         }
423
424         if (size && s)
425                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
426
427         return pages;
428 }
429
430 /*
431  * Poison init memory with an undefined instruction (ARM) or a branch to an
432  * undefined instruction (Thumb).
433  */
434 static inline void poison_init_mem(void *s, size_t count)
435 {
436         u32 *p = (u32 *)s;
437         for (; count != 0; count -= 4)
438                 *p++ = 0xe7fddef0;
439 }
440
441 static inline void
442 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
443 {
444         struct page *start_pg, *end_pg;
445         unsigned long pg, pgend;
446
447         /*
448          * Convert start_pfn/end_pfn to a struct page pointer.
449          */
450         start_pg = pfn_to_page(start_pfn - 1) + 1;
451         end_pg = pfn_to_page(end_pfn - 1) + 1;
452
453         /*
454          * Convert to physical addresses, and
455          * round start upwards and end downwards.
456          */
457         pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
458         pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
459
460         /*
461          * If there are free pages between these,
462          * free the section of the memmap array.
463          */
464         if (pg < pgend)
465                 free_bootmem(pg, pgend - pg);
466 }
467
468 /*
469  * The mem_map array can get very big.  Free the unused area of the memory map.
470  */
471 static void __init free_unused_memmap(struct meminfo *mi)
472 {
473         unsigned long bank_start, prev_bank_end = 0;
474         unsigned int i;
475
476         /*
477          * This relies on each bank being in address order.
478          * The banks are sorted previously in bootmem_init().
479          */
480         for_each_bank(i, mi) {
481                 struct membank *bank = &mi->bank[i];
482
483                 bank_start = bank_pfn_start(bank);
484
485 #ifdef CONFIG_SPARSEMEM
486                 /*
487                  * Take care not to free memmap entries that don't exist
488                  * due to SPARSEMEM sections which aren't present.
489                  */
490                 bank_start = min(bank_start,
491                                  ALIGN(prev_bank_end, PAGES_PER_SECTION));
492 #else
493                 /*
494                  * Align down here since the VM subsystem insists that the
495                  * memmap entries are valid from the bank start aligned to
496                  * MAX_ORDER_NR_PAGES.
497                  */
498                 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
499 #endif
500                 /*
501                  * If we had a previous bank, and there is a space
502                  * between the current bank and the previous, free it.
503                  */
504                 if (prev_bank_end && prev_bank_end < bank_start)
505                         free_memmap(prev_bank_end, bank_start);
506
507                 /*
508                  * Align up here since the VM subsystem insists that the
509                  * memmap entries are valid from the bank end aligned to
510                  * MAX_ORDER_NR_PAGES.
511                  */
512                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
513         }
514
515 #ifdef CONFIG_SPARSEMEM
516         if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
517                 free_memmap(prev_bank_end,
518                             ALIGN(prev_bank_end, PAGES_PER_SECTION));
519 #endif
520 }
521
522 static void __init free_highpages(void)
523 {
524 #ifdef CONFIG_HIGHMEM
525         unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
526         struct memblock_region *mem, *res;
527
528         /* set highmem page free */
529         for_each_memblock(memory, mem) {
530                 unsigned long start = memblock_region_memory_base_pfn(mem);
531                 unsigned long end = memblock_region_memory_end_pfn(mem);
532
533                 /* Ignore complete lowmem entries */
534                 if (end <= max_low)
535                         continue;
536
537                 /* Truncate partial highmem entries */
538                 if (start < max_low)
539                         start = max_low;
540
541                 /* Find and exclude any reserved regions */
542                 for_each_memblock(reserved, res) {
543                         unsigned long res_start, res_end;
544
545                         res_start = memblock_region_reserved_base_pfn(res);
546                         res_end = memblock_region_reserved_end_pfn(res);
547
548                         if (res_end < start)
549                                 continue;
550                         if (res_start < start)
551                                 res_start = start;
552                         if (res_start > end)
553                                 res_start = end;
554                         if (res_end > end)
555                                 res_end = end;
556                         if (res_start != start)
557                                 totalhigh_pages += free_area(start, res_start,
558                                                              NULL);
559                         start = res_end;
560                         if (start == end)
561                                 break;
562                 }
563
564                 /* And now free anything which remains */
565                 if (start < end)
566                         totalhigh_pages += free_area(start, end, NULL);
567         }
568         totalram_pages += totalhigh_pages;
569 #endif
570 }
571
572 /*
573  * mem_init() marks the free areas in the mem_map and tells us how much
574  * memory is free.  This is done after various parts of the system have
575  * claimed their memory after the kernel image.
576  */
577 void __init mem_init(void)
578 {
579         unsigned long reserved_pages, free_pages;
580         struct memblock_region *reg;
581         int i;
582 #ifdef CONFIG_HAVE_TCM
583         /* These pointers are filled in on TCM detection */
584         extern u32 dtcm_end;
585         extern u32 itcm_end;
586 #endif
587
588         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
589
590         /* this will put all unused low memory onto the freelists */
591         free_unused_memmap(&meminfo);
592
593         totalram_pages += free_all_bootmem();
594
595 #ifdef CONFIG_SA1111
596         /* now that our DMA memory is actually so designated, we can free it */
597         totalram_pages += free_area(PHYS_PFN_OFFSET,
598                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
599 #endif
600
601         free_highpages();
602
603         reserved_pages = free_pages = 0;
604
605         for_each_bank(i, &meminfo) {
606                 struct membank *bank = &meminfo.bank[i];
607                 unsigned int pfn1, pfn2;
608                 struct page *page, *end;
609
610                 pfn1 = bank_pfn_start(bank);
611                 pfn2 = bank_pfn_end(bank);
612
613                 page = pfn_to_page(pfn1);
614                 end  = pfn_to_page(pfn2 - 1) + 1;
615
616                 do {
617                         if (PageReserved(page))
618                                 reserved_pages++;
619                         else if (!page_count(page))
620                                 free_pages++;
621                         page++;
622                 } while (page < end);
623         }
624
625         /*
626          * Since our memory may not be contiguous, calculate the
627          * real number of pages we have in this system
628          */
629         printk(KERN_INFO "Memory:");
630         num_physpages = 0;
631         for_each_memblock(memory, reg) {
632                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
633                         memblock_region_memory_base_pfn(reg);
634                 num_physpages += pages;
635                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
636         }
637         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
638
639         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
640                 nr_free_pages() << (PAGE_SHIFT-10),
641                 free_pages << (PAGE_SHIFT-10),
642                 reserved_pages << (PAGE_SHIFT-10),
643                 totalhigh_pages << (PAGE_SHIFT-10));
644
645 #define MLK(b, t) b, t, ((t) - (b)) >> 10
646 #define MLM(b, t) b, t, ((t) - (b)) >> 20
647 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
648
649         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
650                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
651 #ifdef CONFIG_HAVE_TCM
652                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
653                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
654 #endif
655                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
656                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
657                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
658 #ifdef CONFIG_HIGHMEM
659                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
660 #endif
661 #ifdef CONFIG_MODULES
662                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
663 #endif
664                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
665                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
666                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
667                         "       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",
668
669                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
670                                 (PAGE_SIZE)),
671 #ifdef CONFIG_HAVE_TCM
672                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
673                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
674 #endif
675                         MLK(FIXADDR_START, FIXADDR_TOP),
676                         MLM(VMALLOC_START, VMALLOC_END),
677                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
678 #ifdef CONFIG_HIGHMEM
679                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
680                                 (PAGE_SIZE)),
681 #endif
682 #ifdef CONFIG_MODULES
683                         MLM(MODULES_VADDR, MODULES_END),
684 #endif
685
686                         MLK_ROUNDUP(_text, _etext),
687                         MLK_ROUNDUP(__init_begin, __init_end),
688                         MLK_ROUNDUP(_sdata, _edata),
689                         MLK_ROUNDUP(__bss_start, __bss_stop));
690
691 #undef MLK
692 #undef MLM
693 #undef MLK_ROUNDUP
694
695         /*
696          * Check boundaries twice: Some fundamental inconsistencies can
697          * be detected at build time already.
698          */
699 #ifdef CONFIG_MMU
700         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
701         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
702 #endif
703
704 #ifdef CONFIG_HIGHMEM
705         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
706         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
707 #endif
708
709         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
710                 extern int sysctl_overcommit_memory;
711                 /*
712                  * On a machine this small we won't get
713                  * anywhere without overcommit, so turn
714                  * it on by default.
715                  */
716                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
717         }
718 }
719
720 void free_initmem(void)
721 {
722 #ifdef CONFIG_HAVE_TCM
723         extern char __tcm_start, __tcm_end;
724
725         poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
726         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
727                                     __phys_to_pfn(__pa(&__tcm_end)),
728                                     "TCM link");
729 #endif
730
731         poison_init_mem(__init_begin, __init_end - __init_begin);
732         if (!machine_is_integrator() && !machine_is_cintegrator())
733                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
734                                             __phys_to_pfn(__pa(__init_end)),
735                                             "init");
736 }
737
738 #ifdef CONFIG_BLK_DEV_INITRD
739
740 static int keep_initrd;
741
742 void free_initrd_mem(unsigned long start, unsigned long end)
743 {
744         if (!keep_initrd) {
745                 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
746                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
747                                             __phys_to_pfn(__pa(end)),
748                                             "initrd");
749         }
750 }
751
752 static int __init keepinitrd_setup(char *__unused)
753 {
754         keep_initrd = 1;
755         return 1;
756 }
757
758 __setup("keepinitrd", keepinitrd_setup);
759 #endif