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ARM: Move memory mapping into mmu.c
[deliverable/linux.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
20 #include <asm/mach-types.h>
21 #include <asm/sections.h>
22 #include <asm/setup.h>
23 #include <asm/sizes.h>
24 #include <asm/tlb.h>
25 #include <asm/fixmap.h>
26
27 #include <asm/mach/arch.h>
28 #include <asm/mach/map.h>
29
30 #include "mm.h"
31
32 static unsigned long phys_initrd_start __initdata = 0;
33 static unsigned long phys_initrd_size __initdata = 0;
34
35 static int __init early_initrd(char *p)
36 {
37 unsigned long start, size;
38 char *endp;
39
40 start = memparse(p, &endp);
41 if (*endp == ',') {
42 size = memparse(endp + 1, NULL);
43
44 phys_initrd_start = start;
45 phys_initrd_size = size;
46 }
47 return 0;
48 }
49 early_param("initrd", early_initrd);
50
51 static int __init parse_tag_initrd(const struct tag *tag)
52 {
53 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
54 "please update your bootloader.\n");
55 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
56 phys_initrd_size = tag->u.initrd.size;
57 return 0;
58 }
59
60 __tagtable(ATAG_INITRD, parse_tag_initrd);
61
62 static int __init parse_tag_initrd2(const struct tag *tag)
63 {
64 phys_initrd_start = tag->u.initrd.start;
65 phys_initrd_size = tag->u.initrd.size;
66 return 0;
67 }
68
69 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
70
71 /*
72 * This keeps memory configuration data used by a couple memory
73 * initialization functions, as well as show_mem() for the skipping
74 * of holes in the memory map. It is populated by arm_add_memory().
75 */
76 struct meminfo meminfo;
77
78 void show_mem(void)
79 {
80 int free = 0, total = 0, reserved = 0;
81 int shared = 0, cached = 0, slab = 0, node, i;
82 struct meminfo * mi = &meminfo;
83
84 printk("Mem-info:\n");
85 show_free_areas();
86 for_each_online_node(node) {
87 pg_data_t *n = NODE_DATA(node);
88 struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn;
89
90 for_each_nodebank (i,mi,node) {
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 = map + pfn1;
99 end = map + pfn2;
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
118 printk("%d pages of RAM\n", total);
119 printk("%d free pages\n", free);
120 printk("%d reserved pages\n", reserved);
121 printk("%d slab pages\n", slab);
122 printk("%d pages shared\n", shared);
123 printk("%d pages swap cached\n", cached);
124 }
125
126 static void __init find_node_limits(int node, struct meminfo *mi,
127 unsigned long *min, unsigned long *max_low, unsigned long *max_high)
128 {
129 int i;
130
131 *min = -1UL;
132 *max_low = *max_high = 0;
133
134 for_each_nodebank(i, mi, node) {
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 /*
153 * FIXME: We really want to avoid allocating the bootmap bitmap
154 * over the top of the initrd. Hopefully, this is located towards
155 * the start of a bank, so if we allocate the bootmap bitmap at
156 * the end, we won't clash.
157 */
158 static unsigned int __init
159 find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
160 {
161 unsigned int start_pfn, i, bootmap_pfn;
162
163 start_pfn = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT;
164 bootmap_pfn = 0;
165
166 for_each_nodebank(i, mi, node) {
167 struct membank *bank = &mi->bank[i];
168 unsigned int start, end;
169
170 start = bank_pfn_start(bank);
171 end = bank_pfn_end(bank);
172
173 if (end < start_pfn)
174 continue;
175
176 if (start < start_pfn)
177 start = start_pfn;
178
179 if (end <= start)
180 continue;
181
182 if (end - start >= bootmap_pages) {
183 bootmap_pfn = start;
184 break;
185 }
186 }
187
188 if (bootmap_pfn == 0)
189 BUG();
190
191 return bootmap_pfn;
192 }
193
194 static int __init check_initrd(struct meminfo *mi)
195 {
196 int initrd_node = -2;
197 #ifdef CONFIG_BLK_DEV_INITRD
198 unsigned long end = phys_initrd_start + phys_initrd_size;
199
200 /*
201 * Make sure that the initrd is within a valid area of
202 * memory.
203 */
204 if (phys_initrd_size) {
205 unsigned int i;
206
207 initrd_node = -1;
208
209 for (i = 0; i < mi->nr_banks; i++) {
210 struct membank *bank = &mi->bank[i];
211 if (bank_phys_start(bank) <= phys_initrd_start &&
212 end <= bank_phys_end(bank))
213 initrd_node = bank->node;
214 }
215 }
216
217 if (initrd_node == -1) {
218 printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond "
219 "physical memory - disabling initrd\n",
220 phys_initrd_start, phys_initrd_size);
221 phys_initrd_start = phys_initrd_size = 0;
222 }
223 #endif
224
225 return initrd_node;
226 }
227
228 static void __init bootmem_init_node(int node, struct meminfo *mi,
229 unsigned long start_pfn, unsigned long end_pfn)
230 {
231 unsigned long boot_pfn;
232 unsigned int boot_pages;
233 pg_data_t *pgdat;
234 int i;
235
236 /*
237 * Allocate the bootmem bitmap page.
238 */
239 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
240 boot_pfn = find_bootmap_pfn(node, mi, boot_pages);
241
242 /*
243 * Initialise the bootmem allocator for this node, handing the
244 * memory banks over to bootmem.
245 */
246 node_set_online(node);
247 pgdat = NODE_DATA(node);
248 init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);
249
250 for_each_nodebank(i, mi, node) {
251 struct membank *bank = &mi->bank[i];
252 if (!bank->highmem)
253 free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank));
254 }
255
256 /*
257 * Reserve the bootmem bitmap for this node.
258 */
259 reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
260 boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
261 }
262
263 static void __init bootmem_reserve_initrd(int node)
264 {
265 #ifdef CONFIG_BLK_DEV_INITRD
266 pg_data_t *pgdat = NODE_DATA(node);
267 int res;
268
269 res = reserve_bootmem_node(pgdat, phys_initrd_start,
270 phys_initrd_size, BOOTMEM_EXCLUSIVE);
271
272 if (res == 0) {
273 initrd_start = __phys_to_virt(phys_initrd_start);
274 initrd_end = initrd_start + phys_initrd_size;
275 } else {
276 printk(KERN_ERR
277 "INITRD: 0x%08lx+0x%08lx overlaps in-use "
278 "memory region - disabling initrd\n",
279 phys_initrd_start, phys_initrd_size);
280 }
281 #endif
282 }
283
284 static void __init bootmem_free_node(int node, struct meminfo *mi)
285 {
286 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
287 unsigned long min, max_low, max_high;
288 int i;
289
290 find_node_limits(node, mi, &min, &max_low, &max_high);
291
292 /*
293 * initialise the zones within this node.
294 */
295 memset(zone_size, 0, sizeof(zone_size));
296
297 /*
298 * The size of this node has already been determined. If we need
299 * to do anything fancy with the allocation of this memory to the
300 * zones, now is the time to do it.
301 */
302 zone_size[0] = max_low - min;
303 #ifdef CONFIG_HIGHMEM
304 zone_size[ZONE_HIGHMEM] = max_high - max_low;
305 #endif
306
307 /*
308 * For each bank in this node, calculate the size of the holes.
309 * holes = node_size - sum(bank_sizes_in_node)
310 */
311 memcpy(zhole_size, zone_size, sizeof(zhole_size));
312 for_each_nodebank(i, mi, node) {
313 int idx = 0;
314 #ifdef CONFIG_HIGHMEM
315 if (mi->bank[i].highmem)
316 idx = ZONE_HIGHMEM;
317 #endif
318 zhole_size[idx] -= bank_pfn_size(&mi->bank[i]);
319 }
320
321 /*
322 * Adjust the sizes according to any special requirements for
323 * this machine type.
324 */
325 arch_adjust_zones(node, zone_size, zhole_size);
326
327 free_area_init_node(node, zone_size, min, zhole_size);
328 }
329
330 #ifndef CONFIG_SPARSEMEM
331 int pfn_valid(unsigned long pfn)
332 {
333 struct meminfo *mi = &meminfo;
334 unsigned int left = 0, right = mi->nr_banks;
335
336 do {
337 unsigned int mid = (right + left) / 2;
338 struct membank *bank = &mi->bank[mid];
339
340 if (pfn < bank_pfn_start(bank))
341 right = mid;
342 else if (pfn >= bank_pfn_end(bank))
343 left = mid + 1;
344 else
345 return 1;
346 } while (left < right);
347 return 0;
348 }
349 EXPORT_SYMBOL(pfn_valid);
350
351 static void arm_memory_present(struct meminfo *mi, int node)
352 {
353 }
354 #else
355 static void arm_memory_present(struct meminfo *mi, int node)
356 {
357 int i;
358 for_each_nodebank(i, mi, node) {
359 struct membank *bank = &mi->bank[i];
360 memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank));
361 }
362 }
363 #endif
364
365 void __init bootmem_init(void)
366 {
367 struct meminfo *mi = &meminfo;
368 unsigned long min, max_low, max_high;
369 int node, initrd_node;
370
371 /*
372 * Locate which node contains the ramdisk image, if any.
373 */
374 initrd_node = check_initrd(mi);
375
376 max_low = max_high = 0;
377
378 /*
379 * Run through each node initialising the bootmem allocator.
380 */
381 for_each_node(node) {
382 unsigned long node_low, node_high;
383
384 find_node_limits(node, mi, &min, &node_low, &node_high);
385
386 if (node_low > max_low)
387 max_low = node_low;
388 if (node_high > max_high)
389 max_high = node_high;
390
391 /*
392 * If there is no memory in this node, ignore it.
393 * (We can't have nodes which have no lowmem)
394 */
395 if (node_low == 0)
396 continue;
397
398 bootmem_init_node(node, mi, min, node_low);
399
400 /*
401 * Reserve any special node zero regions.
402 */
403 if (node == 0)
404 reserve_node_zero(NODE_DATA(node));
405
406 /*
407 * If the initrd is in this node, reserve its memory.
408 */
409 if (node == initrd_node)
410 bootmem_reserve_initrd(node);
411
412 /*
413 * Sparsemem tries to allocate bootmem in memory_present(),
414 * so must be done after the fixed reservations
415 */
416 arm_memory_present(mi, node);
417 }
418
419 /*
420 * sparse_init() needs the bootmem allocator up and running.
421 */
422 sparse_init();
423
424 /*
425 * Now free memory in each node - free_area_init_node needs
426 * the sparse mem_map arrays initialized by sparse_init()
427 * for memmap_init_zone(), otherwise all PFNs are invalid.
428 */
429 for_each_node(node)
430 bootmem_free_node(node, mi);
431
432 high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
433
434 /*
435 * This doesn't seem to be used by the Linux memory manager any
436 * more, but is used by ll_rw_block. If we can get rid of it, we
437 * also get rid of some of the stuff above as well.
438 *
439 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
440 * the system, not the maximum PFN.
441 */
442 max_low_pfn = max_low - PHYS_PFN_OFFSET;
443 max_pfn = max_high - PHYS_PFN_OFFSET;
444 }
445
446 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
447 {
448 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
449
450 for (; pfn < end; pfn++) {
451 struct page *page = pfn_to_page(pfn);
452 ClearPageReserved(page);
453 init_page_count(page);
454 __free_page(page);
455 pages++;
456 }
457
458 if (size && s)
459 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
460
461 return pages;
462 }
463
464 static inline void
465 free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn)
466 {
467 struct page *start_pg, *end_pg;
468 unsigned long pg, pgend;
469
470 /*
471 * Convert start_pfn/end_pfn to a struct page pointer.
472 */
473 start_pg = pfn_to_page(start_pfn - 1) + 1;
474 end_pg = pfn_to_page(end_pfn);
475
476 /*
477 * Convert to physical addresses, and
478 * round start upwards and end downwards.
479 */
480 pg = PAGE_ALIGN(__pa(start_pg));
481 pgend = __pa(end_pg) & PAGE_MASK;
482
483 /*
484 * If there are free pages between these,
485 * free the section of the memmap array.
486 */
487 if (pg < pgend)
488 free_bootmem_node(NODE_DATA(node), pg, pgend - pg);
489 }
490
491 /*
492 * The mem_map array can get very big. Free the unused area of the memory map.
493 */
494 static void __init free_unused_memmap_node(int node, struct meminfo *mi)
495 {
496 unsigned long bank_start, prev_bank_end = 0;
497 unsigned int i;
498
499 /*
500 * [FIXME] This relies on each bank being in address order. This
501 * may not be the case, especially if the user has provided the
502 * information on the command line.
503 */
504 for_each_nodebank(i, mi, node) {
505 struct membank *bank = &mi->bank[i];
506
507 bank_start = bank_pfn_start(bank);
508 if (bank_start < prev_bank_end) {
509 printk(KERN_ERR "MEM: unordered memory banks. "
510 "Not freeing memmap.\n");
511 break;
512 }
513
514 /*
515 * If we had a previous bank, and there is a space
516 * between the current bank and the previous, free it.
517 */
518 if (prev_bank_end && prev_bank_end != bank_start)
519 free_memmap(node, prev_bank_end, bank_start);
520
521 prev_bank_end = bank_pfn_end(bank);
522 }
523 }
524
525 /*
526 * mem_init() marks the free areas in the mem_map and tells us how much
527 * memory is free. This is done after various parts of the system have
528 * claimed their memory after the kernel image.
529 */
530 void __init mem_init(void)
531 {
532 unsigned long reserved_pages, free_pages;
533 int i, node;
534
535 #ifndef CONFIG_DISCONTIGMEM
536 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
537 #endif
538
539 /* this will put all unused low memory onto the freelists */
540 for_each_online_node(node) {
541 pg_data_t *pgdat = NODE_DATA(node);
542
543 free_unused_memmap_node(node, &meminfo);
544
545 if (pgdat->node_spanned_pages != 0)
546 totalram_pages += free_all_bootmem_node(pgdat);
547 }
548
549 #ifdef CONFIG_SA1111
550 /* now that our DMA memory is actually so designated, we can free it */
551 totalram_pages += free_area(PHYS_PFN_OFFSET,
552 __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
553 #endif
554
555 #ifdef CONFIG_HIGHMEM
556 /* set highmem page free */
557 for_each_online_node(node) {
558 for_each_nodebank (i, &meminfo, node) {
559 unsigned long start = bank_pfn_start(&meminfo.bank[i]);
560 unsigned long end = bank_pfn_end(&meminfo.bank[i]);
561 if (start >= max_low_pfn + PHYS_PFN_OFFSET)
562 totalhigh_pages += free_area(start, end, NULL);
563 }
564 }
565 totalram_pages += totalhigh_pages;
566 #endif
567
568 reserved_pages = free_pages = 0;
569
570 for_each_online_node(node) {
571 pg_data_t *n = NODE_DATA(node);
572 struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn;
573
574 for_each_nodebank(i, &meminfo, node) {
575 struct membank *bank = &meminfo.bank[i];
576 unsigned int pfn1, pfn2;
577 struct page *page, *end;
578
579 pfn1 = bank_pfn_start(bank);
580 pfn2 = bank_pfn_end(bank);
581
582 page = map + pfn1;
583 end = map + pfn2;
584
585 do {
586 if (PageReserved(page))
587 reserved_pages++;
588 else if (!page_count(page))
589 free_pages++;
590 page++;
591 } while (page < end);
592 }
593 }
594
595 /*
596 * Since our memory may not be contiguous, calculate the
597 * real number of pages we have in this system
598 */
599 printk(KERN_INFO "Memory:");
600 num_physpages = 0;
601 for (i = 0; i < meminfo.nr_banks; i++) {
602 num_physpages += bank_pfn_size(&meminfo.bank[i]);
603 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
604 }
605 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
606
607 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
608 nr_free_pages() << (PAGE_SHIFT-10),
609 free_pages << (PAGE_SHIFT-10),
610 reserved_pages << (PAGE_SHIFT-10),
611 totalhigh_pages << (PAGE_SHIFT-10));
612
613 #define MLK(b, t) b, t, ((t) - (b)) >> 10
614 #define MLM(b, t) b, t, ((t) - (b)) >> 20
615 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
616
617 printk(KERN_NOTICE "Virtual kernel memory layout:\n"
618 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
619 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
620 #ifdef CONFIG_MMU
621 " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n"
622 #endif
623 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
624 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
625 #ifdef CONFIG_HIGHMEM
626 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n"
627 #endif
628 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
629 " .init : 0x%p" " - 0x%p" " (%4d kB)\n"
630 " .text : 0x%p" " - 0x%p" " (%4d kB)\n"
631 " .data : 0x%p" " - 0x%p" " (%4d kB)\n",
632
633 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
634 (PAGE_SIZE)),
635 MLK(FIXADDR_START, FIXADDR_TOP),
636 #ifdef CONFIG_MMU
637 MLM(CONSISTENT_BASE, CONSISTENT_END),
638 #endif
639 MLM(VMALLOC_START, VMALLOC_END),
640 MLM(PAGE_OFFSET, (unsigned long)high_memory),
641 #ifdef CONFIG_HIGHMEM
642 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
643 (PAGE_SIZE)),
644 #endif
645 MLM(MODULES_VADDR, MODULES_END),
646
647 MLK_ROUNDUP(__init_begin, __init_end),
648 MLK_ROUNDUP(_text, _etext),
649 MLK_ROUNDUP(_data, _edata));
650
651 #undef MLK
652 #undef MLM
653 #undef MLK_ROUNDUP
654
655 /*
656 * Check boundaries twice: Some fundamental inconsistencies can
657 * be detected at build time already.
658 */
659 #ifdef CONFIG_MMU
660 BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE);
661 BUG_ON(VMALLOC_END > CONSISTENT_BASE);
662
663 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
664 BUG_ON(TASK_SIZE > MODULES_VADDR);
665 #endif
666
667 #ifdef CONFIG_HIGHMEM
668 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
669 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
670 #endif
671
672 if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
673 extern int sysctl_overcommit_memory;
674 /*
675 * On a machine this small we won't get
676 * anywhere without overcommit, so turn
677 * it on by default.
678 */
679 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
680 }
681 }
682
683 void free_initmem(void)
684 {
685 #ifdef CONFIG_HAVE_TCM
686 extern char *__tcm_start, *__tcm_end;
687
688 totalram_pages += free_area(__phys_to_pfn(__pa(__tcm_start)),
689 __phys_to_pfn(__pa(__tcm_end)),
690 "TCM link");
691 #endif
692
693 if (!machine_is_integrator() && !machine_is_cintegrator())
694 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
695 __phys_to_pfn(__pa(__init_end)),
696 "init");
697 }
698
699 #ifdef CONFIG_BLK_DEV_INITRD
700
701 static int keep_initrd;
702
703 void free_initrd_mem(unsigned long start, unsigned long end)
704 {
705 if (!keep_initrd)
706 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
707 __phys_to_pfn(__pa(end)),
708 "initrd");
709 }
710
711 static int __init keepinitrd_setup(char *__unused)
712 {
713 keep_initrd = 1;
714 return 1;
715 }
716
717 __setup("keepinitrd", keepinitrd_setup);
718 #endif
Linux kernel - Deliverables
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