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Pull misc-2.6.40 into release branch
[GitHub/mt8127/android_kernel_alcatel_ttab.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/highmem.h>
19 #include <linux/gfp.h>
20 #include <linux/memblock.h>
21 #include <linux/sort.h>
22
23 #include <asm/mach-types.h>
24 #include <asm/sections.h>
25 #include <asm/setup.h>
26 #include <asm/sizes.h>
27 #include <asm/tlb.h>
28 #include <asm/fixmap.h>
29
30 #include <asm/mach/arch.h>
31 #include <asm/mach/map.h>
32
33 #include "mm.h"
34
35 static unsigned long phys_initrd_start __initdata = 0;
36 static unsigned long phys_initrd_size __initdata = 0;
37
38 static int __init early_initrd(char *p)
39 {
40 unsigned long start, size;
41 char *endp;
42
43 start = memparse(p, &endp);
44 if (*endp == ',') {
45 size = memparse(endp + 1, NULL);
46
47 phys_initrd_start = start;
48 phys_initrd_size = size;
49 }
50 return 0;
51 }
52 early_param("initrd", early_initrd);
53
54 static int __init parse_tag_initrd(const struct tag *tag)
55 {
56 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
57 "please update your bootloader.\n");
58 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
59 phys_initrd_size = tag->u.initrd.size;
60 return 0;
61 }
62
63 __tagtable(ATAG_INITRD, parse_tag_initrd);
64
65 static int __init parse_tag_initrd2(const struct tag *tag)
66 {
67 phys_initrd_start = tag->u.initrd.start;
68 phys_initrd_size = tag->u.initrd.size;
69 return 0;
70 }
71
72 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
73
74 /*
75 * This keeps memory configuration data used by a couple memory
76 * initialization functions, as well as show_mem() for the skipping
77 * of holes in the memory map. It is populated by arm_add_memory().
78 */
79 struct meminfo meminfo;
80
81 void show_mem(unsigned int filter)
82 {
83 int free = 0, total = 0, reserved = 0;
84 int shared = 0, cached = 0, slab = 0, i;
85 struct meminfo * mi = &meminfo;
86
87 printk("Mem-info:\n");
88 show_free_areas();
89
90 for_each_bank (i, mi) {
91 struct membank *bank = &mi->bank[i];
92 unsigned int pfn1, pfn2;
93 struct page *page, *end;
94
95 pfn1 = bank_pfn_start(bank);
96 pfn2 = bank_pfn_end(bank);
97
98 page = pfn_to_page(pfn1);
99 end = pfn_to_page(pfn2 - 1) + 1;
100
101 do {
102 total++;
103 if (PageReserved(page))
104 reserved++;
105 else if (PageSwapCache(page))
106 cached++;
107 else if (PageSlab(page))
108 slab++;
109 else if (!page_count(page))
110 free++;
111 else
112 shared += page_count(page) - 1;
113 page++;
114 } while (page < end);
115 }
116
117 printk("%d pages of RAM\n", total);
118 printk("%d free pages\n", free);
119 printk("%d reserved pages\n", reserved);
120 printk("%d slab pages\n", slab);
121 printk("%d pages shared\n", shared);
122 printk("%d pages swap cached\n", cached);
123 }
124
125 static void __init find_limits(unsigned long *min, unsigned long *max_low,
126 unsigned long *max_high)
127 {
128 struct meminfo *mi = &meminfo;
129 int i;
130
131 *min = -1UL;
132 *max_low = *max_high = 0;
133
134 for_each_bank (i, mi) {
135 struct membank *bank = &mi->bank[i];
136 unsigned long start, end;
137
138 start = bank_pfn_start(bank);
139 end = bank_pfn_end(bank);
140
141 if (*min > start)
142 *min = start;
143 if (*max_high < end)
144 *max_high = end;
145 if (bank->highmem)
146 continue;
147 if (*max_low < end)
148 *max_low = end;
149 }
150 }
151
152 static void __init arm_bootmem_init(unsigned long start_pfn,
153 unsigned long end_pfn)
154 {
155 struct memblock_region *reg;
156 unsigned int boot_pages;
157 phys_addr_t bitmap;
158 pg_data_t *pgdat;
159
160 /*
161 * Allocate the bootmem bitmap page. This must be in a region
162 * of memory which has already been mapped.
163 */
164 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
165 bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
166 __pfn_to_phys(end_pfn));
167
168 /*
169 * Initialise the bootmem allocator, handing the
170 * memory banks over to bootmem.
171 */
172 node_set_online(0);
173 pgdat = NODE_DATA(0);
174 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
175
176 /* Free the lowmem regions from memblock into bootmem. */
177 for_each_memblock(memory, reg) {
178 unsigned long start = memblock_region_memory_base_pfn(reg);
179 unsigned long end = memblock_region_memory_end_pfn(reg);
180
181 if (end >= end_pfn)
182 end = end_pfn;
183 if (start >= end)
184 break;
185
186 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
187 }
188
189 /* Reserve the lowmem memblock reserved regions in bootmem. */
190 for_each_memblock(reserved, reg) {
191 unsigned long start = memblock_region_reserved_base_pfn(reg);
192 unsigned long end = memblock_region_reserved_end_pfn(reg);
193
194 if (end >= end_pfn)
195 end = end_pfn;
196 if (start >= end)
197 break;
198
199 reserve_bootmem(__pfn_to_phys(start),
200 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
201 }
202 }
203
204 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
205 unsigned long max_high)
206 {
207 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
208 struct memblock_region *reg;
209
210 /*
211 * initialise the zones.
212 */
213 memset(zone_size, 0, sizeof(zone_size));
214
215 /*
216 * The memory size has already been determined. If we need
217 * to do anything fancy with the allocation of this memory
218 * to the zones, now is the time to do it.
219 */
220 zone_size[0] = max_low - min;
221 #ifdef CONFIG_HIGHMEM
222 zone_size[ZONE_HIGHMEM] = max_high - max_low;
223 #endif
224
225 /*
226 * Calculate the size of the holes.
227 * holes = node_size - sum(bank_sizes)
228 */
229 memcpy(zhole_size, zone_size, sizeof(zhole_size));
230 for_each_memblock(memory, reg) {
231 unsigned long start = memblock_region_memory_base_pfn(reg);
232 unsigned long end = memblock_region_memory_end_pfn(reg);
233
234 if (start < max_low) {
235 unsigned long low_end = min(end, max_low);
236 zhole_size[0] -= low_end - start;
237 }
238 #ifdef CONFIG_HIGHMEM
239 if (end > max_low) {
240 unsigned long high_start = max(start, max_low);
241 zhole_size[ZONE_HIGHMEM] -= end - high_start;
242 }
243 #endif
244 }
245
246 /*
247 * Adjust the sizes according to any special requirements for
248 * this machine type.
249 */
250 arch_adjust_zones(zone_size, zhole_size);
251
252 free_area_init_node(0, zone_size, min, zhole_size);
253 }
254
255 #ifndef CONFIG_SPARSEMEM
256 int pfn_valid(unsigned long pfn)
257 {
258 return memblock_is_memory(pfn << PAGE_SHIFT);
259 }
260 EXPORT_SYMBOL(pfn_valid);
261
262 static void arm_memory_present(void)
263 {
264 }
265 #else
266 static void arm_memory_present(void)
267 {
268 struct memblock_region *reg;
269
270 for_each_memblock(memory, reg)
271 memory_present(0, memblock_region_memory_base_pfn(reg),
272 memblock_region_memory_end_pfn(reg));
273 }
274 #endif
275
276 static int __init meminfo_cmp(const void *_a, const void *_b)
277 {
278 const struct membank *a = _a, *b = _b;
279 long cmp = bank_pfn_start(a) - bank_pfn_start(b);
280 return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
281 }
282
283 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
284 {
285 int i;
286
287 sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
288
289 memblock_init();
290 for (i = 0; i < mi->nr_banks; i++)
291 memblock_add(mi->bank[i].start, mi->bank[i].size);
292
293 /* Register the kernel text, kernel data and initrd with memblock. */
294 #ifdef CONFIG_XIP_KERNEL
295 memblock_reserve(__pa(_sdata), _end - _sdata);
296 #else
297 memblock_reserve(__pa(_stext), _end - _stext);
298 #endif
299 #ifdef CONFIG_BLK_DEV_INITRD
300 if (phys_initrd_size &&
301 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
302 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
303 phys_initrd_start, phys_initrd_size);
304 phys_initrd_start = phys_initrd_size = 0;
305 }
306 if (phys_initrd_size) {
307 memblock_reserve(phys_initrd_start, phys_initrd_size);
308
309 /* Now convert initrd to virtual addresses */
310 initrd_start = __phys_to_virt(phys_initrd_start);
311 initrd_end = initrd_start + phys_initrd_size;
312 }
313 #endif
314
315 arm_mm_memblock_reserve();
316
317 /* reserve any platform specific memblock areas */
318 if (mdesc->reserve)
319 mdesc->reserve();
320
321 memblock_analyze();
322 memblock_dump_all();
323 }
324
325 void __init bootmem_init(void)
326 {
327 unsigned long min, max_low, max_high;
328
329 max_low = max_high = 0;
330
331 find_limits(&min, &max_low, &max_high);
332
333 arm_bootmem_init(min, max_low);
334
335 /*
336 * Sparsemem tries to allocate bootmem in memory_present(),
337 * so must be done after the fixed reservations
338 */
339 arm_memory_present();
340
341 /*
342 * sparse_init() needs the bootmem allocator up and running.
343 */
344 sparse_init();
345
346 /*
347 * Now free the memory - free_area_init_node needs
348 * the sparse mem_map arrays initialized by sparse_init()
349 * for memmap_init_zone(), otherwise all PFNs are invalid.
350 */
351 arm_bootmem_free(min, max_low, max_high);
352
353 high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1;
354
355 /*
356 * This doesn't seem to be used by the Linux memory manager any
357 * more, but is used by ll_rw_block. If we can get rid of it, we
358 * also get rid of some of the stuff above as well.
359 *
360 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
361 * the system, not the maximum PFN.
362 */
363 max_low_pfn = max_low - PHYS_PFN_OFFSET;
364 max_pfn = max_high - PHYS_PFN_OFFSET;
365 }
366
367 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
368 {
369 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
370
371 for (; pfn < end; pfn++) {
372 struct page *page = pfn_to_page(pfn);
373 ClearPageReserved(page);
374 init_page_count(page);
375 __free_page(page);
376 pages++;
377 }
378
379 if (size && s)
380 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
381
382 return pages;
383 }
384
385 static inline void
386 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
387 {
388 struct page *start_pg, *end_pg;
389 unsigned long pg, pgend;
390
391 /*
392 * Convert start_pfn/end_pfn to a struct page pointer.
393 */
394 start_pg = pfn_to_page(start_pfn - 1) + 1;
395 end_pg = pfn_to_page(end_pfn - 1) + 1;
396
397 /*
398 * Convert to physical addresses, and
399 * round start upwards and end downwards.
400 */
401 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
402 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
403
404 /*
405 * If there are free pages between these,
406 * free the section of the memmap array.
407 */
408 if (pg < pgend)
409 free_bootmem(pg, pgend - pg);
410 }
411
412 /*
413 * The mem_map array can get very big. Free the unused area of the memory map.
414 */
415 static void __init free_unused_memmap(struct meminfo *mi)
416 {
417 unsigned long bank_start, prev_bank_end = 0;
418 unsigned int i;
419
420 /*
421 * This relies on each bank being in address order.
422 * The banks are sorted previously in bootmem_init().
423 */
424 for_each_bank(i, mi) {
425 struct membank *bank = &mi->bank[i];
426
427 bank_start = bank_pfn_start(bank);
428
429 #ifdef CONFIG_SPARSEMEM
430 /*
431 * Take care not to free memmap entries that don't exist
432 * due to SPARSEMEM sections which aren't present.
433 */
434 bank_start = min(bank_start,
435 ALIGN(prev_bank_end, PAGES_PER_SECTION));
436 #endif
437 /*
438 * If we had a previous bank, and there is a space
439 * between the current bank and the previous, free it.
440 */
441 if (prev_bank_end && prev_bank_end < bank_start)
442 free_memmap(prev_bank_end, bank_start);
443
444 /*
445 * Align up here since the VM subsystem insists that the
446 * memmap entries are valid from the bank end aligned to
447 * MAX_ORDER_NR_PAGES.
448 */
449 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
450 }
451
452 #ifdef CONFIG_SPARSEMEM
453 if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
454 free_memmap(prev_bank_end,
455 ALIGN(prev_bank_end, PAGES_PER_SECTION));
456 #endif
457 }
458
459 static void __init free_highpages(void)
460 {
461 #ifdef CONFIG_HIGHMEM
462 unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
463 struct memblock_region *mem, *res;
464
465 /* set highmem page free */
466 for_each_memblock(memory, mem) {
467 unsigned long start = memblock_region_memory_base_pfn(mem);
468 unsigned long end = memblock_region_memory_end_pfn(mem);
469
470 /* Ignore complete lowmem entries */
471 if (end <= max_low)
472 continue;
473
474 /* Truncate partial highmem entries */
475 if (start < max_low)
476 start = max_low;
477
478 /* Find and exclude any reserved regions */
479 for_each_memblock(reserved, res) {
480 unsigned long res_start, res_end;
481
482 res_start = memblock_region_reserved_base_pfn(res);
483 res_end = memblock_region_reserved_end_pfn(res);
484
485 if (res_end < start)
486 continue;
487 if (res_start < start)
488 res_start = start;
489 if (res_start > end)
490 res_start = end;
491 if (res_end > end)
492 res_end = end;
493 if (res_start != start)
494 totalhigh_pages += free_area(start, res_start,
495 NULL);
496 start = res_end;
497 if (start == end)
498 break;
499 }
500
501 /* And now free anything which remains */
502 if (start < end)
503 totalhigh_pages += free_area(start, end, NULL);
504 }
505 totalram_pages += totalhigh_pages;
506 #endif
507 }
508
509 /*
510 * mem_init() marks the free areas in the mem_map and tells us how much
511 * memory is free. This is done after various parts of the system have
512 * claimed their memory after the kernel image.
513 */
514 void __init mem_init(void)
515 {
516 unsigned long reserved_pages, free_pages;
517 struct memblock_region *reg;
518 int i;
519 #ifdef CONFIG_HAVE_TCM
520 /* These pointers are filled in on TCM detection */
521 extern u32 dtcm_end;
522 extern u32 itcm_end;
523 #endif
524
525 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
526
527 /* this will put all unused low memory onto the freelists */
528 free_unused_memmap(&meminfo);
529
530 totalram_pages += free_all_bootmem();
531
532 #ifdef CONFIG_SA1111
533 /* now that our DMA memory is actually so designated, we can free it */
534 totalram_pages += free_area(PHYS_PFN_OFFSET,
535 __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
536 #endif
537
538 free_highpages();
539
540 reserved_pages = free_pages = 0;
541
542 for_each_bank(i, &meminfo) {
543 struct membank *bank = &meminfo.bank[i];
544 unsigned int pfn1, pfn2;
545 struct page *page, *end;
546
547 pfn1 = bank_pfn_start(bank);
548 pfn2 = bank_pfn_end(bank);
549
550 page = pfn_to_page(pfn1);
551 end = pfn_to_page(pfn2 - 1) + 1;
552
553 do {
554 if (PageReserved(page))
555 reserved_pages++;
556 else if (!page_count(page))
557 free_pages++;
558 page++;
559 } while (page < end);
560 }
561
562 /*
563 * Since our memory may not be contiguous, calculate the
564 * real number of pages we have in this system
565 */
566 printk(KERN_INFO "Memory:");
567 num_physpages = 0;
568 for_each_memblock(memory, reg) {
569 unsigned long pages = memblock_region_memory_end_pfn(reg) -
570 memblock_region_memory_base_pfn(reg);
571 num_physpages += pages;
572 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
573 }
574 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
575
576 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
577 nr_free_pages() << (PAGE_SHIFT-10),
578 free_pages << (PAGE_SHIFT-10),
579 reserved_pages << (PAGE_SHIFT-10),
580 totalhigh_pages << (PAGE_SHIFT-10));
581
582 #define MLK(b, t) b, t, ((t) - (b)) >> 10
583 #define MLM(b, t) b, t, ((t) - (b)) >> 20
584 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
585
586 printk(KERN_NOTICE "Virtual kernel memory layout:\n"
587 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
588 #ifdef CONFIG_HAVE_TCM
589 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
590 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
591 #endif
592 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
593 #ifdef CONFIG_MMU
594 " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n"
595 #endif
596 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
597 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
598 #ifdef CONFIG_HIGHMEM
599 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n"
600 #endif
601 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
602 " .init : 0x%p" " - 0x%p" " (%4d kB)\n"
603 " .text : 0x%p" " - 0x%p" " (%4d kB)\n"
604 " .data : 0x%p" " - 0x%p" " (%4d kB)\n",
605
606 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
607 (PAGE_SIZE)),
608 #ifdef CONFIG_HAVE_TCM
609 MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
610 MLK(ITCM_OFFSET, (unsigned long) itcm_end),
611 #endif
612 MLK(FIXADDR_START, FIXADDR_TOP),
613 #ifdef CONFIG_MMU
614 MLM(CONSISTENT_BASE, CONSISTENT_END),
615 #endif
616 MLM(VMALLOC_START, VMALLOC_END),
617 MLM(PAGE_OFFSET, (unsigned long)high_memory),
618 #ifdef CONFIG_HIGHMEM
619 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
620 (PAGE_SIZE)),
621 #endif
622 MLM(MODULES_VADDR, MODULES_END),
623
624 MLK_ROUNDUP(__init_begin, __init_end),
625 MLK_ROUNDUP(_text, _etext),
626 MLK_ROUNDUP(_sdata, _edata));
627
628 #undef MLK
629 #undef MLM
630 #undef MLK_ROUNDUP
631
632 /*
633 * Check boundaries twice: Some fundamental inconsistencies can
634 * be detected at build time already.
635 */
636 #ifdef CONFIG_MMU
637 BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE);
638 BUG_ON(VMALLOC_END > CONSISTENT_BASE);
639
640 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
641 BUG_ON(TASK_SIZE > MODULES_VADDR);
642 #endif
643
644 #ifdef CONFIG_HIGHMEM
645 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
646 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
647 #endif
648
649 if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
650 extern int sysctl_overcommit_memory;
651 /*
652 * On a machine this small we won't get
653 * anywhere without overcommit, so turn
654 * it on by default.
655 */
656 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
657 }
658 }
659
660 void free_initmem(void)
661 {
662 #ifdef CONFIG_HAVE_TCM
663 extern char __tcm_start, __tcm_end;
664
665 totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
666 __phys_to_pfn(__pa(&__tcm_end)),
667 "TCM link");
668 #endif
669
670 if (!machine_is_integrator() && !machine_is_cintegrator())
671 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
672 __phys_to_pfn(__pa(__init_end)),
673 "init");
674 }
675
676 #ifdef CONFIG_BLK_DEV_INITRD
677
678 static int keep_initrd;
679
680 void free_initrd_mem(unsigned long start, unsigned long end)
681 {
682 if (!keep_initrd)
683 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
684 __phys_to_pfn(__pa(end)),
685 "initrd");
686 }
687
688 static int __init keepinitrd_setup(char *__unused)
689 {
690 keep_initrd = 1;
691 return 1;
692 }
693
694 __setup("keepinitrd", keepinitrd_setup);
695 #endif
kernel source for telekom puls (alcatel/mediatek)