2 * linux/arch/arm/mm/init.c
4 * Copyright (C) 1995-2005 Russell King
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.
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>
22 #include <asm/mach-types.h>
23 #include <asm/sections.h>
24 #include <asm/setup.h>
25 #include <asm/sizes.h>
27 #include <asm/fixmap.h>
29 #include <asm/mach/arch.h>
30 #include <asm/mach/map.h>
34 static unsigned long phys_initrd_start __initdata = 0;
35 static unsigned long phys_initrd_size __initdata = 0;
37 static int __init early_initrd(char *p)
39 unsigned long start, size;
42 start = memparse(p, &endp);
44 size = memparse(endp + 1, NULL);
46 phys_initrd_start = start;
47 phys_initrd_size = size;
51 early_param("initrd", early_initrd);
53 static int __init parse_tag_initrd(const struct tag *tag)
55 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
56 "please update your bootloader.\n");
57 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
58 phys_initrd_size = tag->u.initrd.size;
62 __tagtable(ATAG_INITRD, parse_tag_initrd);
64 static int __init parse_tag_initrd2(const struct tag *tag)
66 phys_initrd_start = tag->u.initrd.start;
67 phys_initrd_size = tag->u.initrd.size;
71 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
74 * This keeps memory configuration data used by a couple memory
75 * initialization functions, as well as show_mem() for the skipping
76 * of holes in the memory map. It is populated by arm_add_memory().
78 struct meminfo meminfo;
82 int free = 0, total = 0, reserved = 0;
83 int shared = 0, cached = 0, slab = 0, i;
84 struct meminfo * mi = &meminfo;
86 printk("Mem-info:\n");
89 for_each_bank (i, mi) {
90 struct membank *bank = &mi->bank[i];
91 unsigned int pfn1, pfn2;
92 struct page *page, *end;
94 pfn1 = bank_pfn_start(bank);
95 pfn2 = bank_pfn_end(bank);
97 page = pfn_to_page(pfn1);
98 end = pfn_to_page(pfn2 - 1) + 1;
102 if (PageReserved(page))
104 else if (PageSwapCache(page))
106 else if (PageSlab(page))
108 else if (!page_count(page))
111 shared += page_count(page) - 1;
113 } while (page < end);
116 printk("%d pages of RAM\n", total);
117 printk("%d free pages\n", free);
118 printk("%d reserved pages\n", reserved);
119 printk("%d slab pages\n", slab);
120 printk("%d pages shared\n", shared);
121 printk("%d pages swap cached\n", cached);
124 static void __init find_limits(struct meminfo *mi,
125 unsigned long *min, unsigned long *max_low, unsigned long *max_high)
130 *max_low = *max_high = 0;
132 for_each_bank (i, mi) {
133 struct membank *bank = &mi->bank[i];
134 unsigned long start, end;
136 start = bank_pfn_start(bank);
137 end = bank_pfn_end(bank);
150 static void __init arm_bootmem_init(unsigned long start_pfn,
151 unsigned long end_pfn)
153 unsigned int boot_pages;
159 * Allocate the bootmem bitmap page. This must be in a region
160 * of memory which has already been mapped.
162 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
163 bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
164 __pfn_to_phys(end_pfn));
167 * Initialise the bootmem allocator, handing the
168 * memory banks over to bootmem.
171 pgdat = NODE_DATA(0);
172 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
174 /* Free the lowmem regions from memblock into bootmem. */
175 for (i = 0; i < memblock.memory.cnt; i++) {
176 unsigned long start = memblock_start_pfn(&memblock.memory, i);
177 unsigned long end = memblock_end_pfn(&memblock.memory, i);
184 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
187 /* Reserve the lowmem memblock reserved regions in bootmem. */
188 for (i = 0; i < memblock.reserved.cnt; i++) {
189 unsigned long start = memblock_start_pfn(&memblock.reserved, i);
190 unsigned long size = memblock_size_bytes(&memblock.reserved, i);
192 if (start >= end_pfn)
194 if (start + PFN_UP(size) > end_pfn)
195 size = (end_pfn - start) << PAGE_SHIFT;
197 reserve_bootmem(__pfn_to_phys(start), size, BOOTMEM_DEFAULT);
201 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
202 unsigned long max_high)
204 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
208 * initialise the zones.
210 memset(zone_size, 0, sizeof(zone_size));
213 * The memory size has already been determined. If we need
214 * to do anything fancy with the allocation of this memory
215 * to the zones, now is the time to do it.
217 zone_size[0] = max_low - min;
218 #ifdef CONFIG_HIGHMEM
219 zone_size[ZONE_HIGHMEM] = max_high - max_low;
223 * Calculate the size of the holes.
224 * holes = node_size - sum(bank_sizes)
226 memcpy(zhole_size, zone_size, sizeof(zhole_size));
227 for (i = 0; i < memblock.memory.cnt; i++) {
228 unsigned long start = memblock_start_pfn(&memblock.memory, i);
229 unsigned long end = memblock_end_pfn(&memblock.memory, i);
231 if (start < max_low) {
232 unsigned long low_end = min(end, max_low);
234 zhole_size[0] -= low_end - start;
237 #ifdef CONFIG_HIGHMEM
239 unsigned long high_start = max(start, max_low);
241 zhole_size[ZONE_HIGHMEM] -= end - high_start;
247 * Adjust the sizes according to any special requirements for
250 arch_adjust_zones(zone_size, zhole_size);
252 free_area_init_node(0, zone_size, min, zhole_size);
255 #ifndef CONFIG_SPARSEMEM
256 int pfn_valid(unsigned long pfn)
258 struct memblock_region *mem = &memblock.memory;
259 unsigned int left = 0, right = mem->cnt;
262 unsigned int mid = (right + left) / 2;
264 if (pfn < memblock_start_pfn(mem, mid))
266 else if (pfn >= memblock_end_pfn(mem, mid))
270 } while (left < right);
273 EXPORT_SYMBOL(pfn_valid);
275 static void arm_memory_present(void)
279 static void arm_memory_present(void)
282 for (i = 0; i < memblock.memory.cnt; i++)
283 memory_present(0, memblock_start_pfn(&memblock.memory, i),
284 memblock_end_pfn(&memblock.memory, i));
288 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
293 for (i = 0; i < mi->nr_banks; i++)
294 memblock_add(mi->bank[i].start, mi->bank[i].size);
296 /* Register the kernel text, kernel data and initrd with memblock. */
297 #ifdef CONFIG_XIP_KERNEL
298 memblock_reserve(__pa(_data), _end - _data);
300 memblock_reserve(__pa(_stext), _end - _stext);
302 #ifdef CONFIG_BLK_DEV_INITRD
303 if (phys_initrd_size) {
304 memblock_reserve(phys_initrd_start, phys_initrd_size);
306 /* Now convert initrd to virtual addresses */
307 initrd_start = __phys_to_virt(phys_initrd_start);
308 initrd_end = initrd_start + phys_initrd_size;
312 arm_mm_memblock_reserve();
314 /* reserve any platform specific memblock areas */
322 void __init bootmem_init(void)
324 struct meminfo *mi = &meminfo;
325 unsigned long min, max_low, max_high;
327 max_low = max_high = 0;
329 find_limits(mi, &min, &max_low, &max_high);
331 arm_bootmem_init(min, max_low);
334 * Sparsemem tries to allocate bootmem in memory_present(),
335 * so must be done after the fixed reservations
337 arm_memory_present();
340 * sparse_init() needs the bootmem allocator up and running.
345 * Now free the memory - free_area_init_node needs
346 * the sparse mem_map arrays initialized by sparse_init()
347 * for memmap_init_zone(), otherwise all PFNs are invalid.
349 arm_bootmem_free(min, max_low, max_high);
351 high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
354 * This doesn't seem to be used by the Linux memory manager any
355 * more, but is used by ll_rw_block. If we can get rid of it, we
356 * also get rid of some of the stuff above as well.
358 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
359 * the system, not the maximum PFN.
361 max_low_pfn = max_low - PHYS_PFN_OFFSET;
362 max_pfn = max_high - PHYS_PFN_OFFSET;
365 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
367 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
369 for (; pfn < end; pfn++) {
370 struct page *page = pfn_to_page(pfn);
371 ClearPageReserved(page);
372 init_page_count(page);
378 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
384 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
386 struct page *start_pg, *end_pg;
387 unsigned long pg, pgend;
390 * Convert start_pfn/end_pfn to a struct page pointer.
392 start_pg = pfn_to_page(start_pfn - 1) + 1;
393 end_pg = pfn_to_page(end_pfn);
396 * Convert to physical addresses, and
397 * round start upwards and end downwards.
399 pg = PAGE_ALIGN(__pa(start_pg));
400 pgend = __pa(end_pg) & PAGE_MASK;
403 * If there are free pages between these,
404 * free the section of the memmap array.
407 free_bootmem(pg, pgend - pg);
411 * The mem_map array can get very big. Free the unused area of the memory map.
413 static void __init free_unused_memmap(struct meminfo *mi)
415 unsigned long bank_start, prev_bank_end = 0;
419 * This relies on each bank being in address order.
420 * The banks are sorted previously in bootmem_init().
422 for_each_bank(i, mi) {
423 struct membank *bank = &mi->bank[i];
425 bank_start = bank_pfn_start(bank);
428 * If we had a previous bank, and there is a space
429 * between the current bank and the previous, free it.
431 if (prev_bank_end && prev_bank_end < bank_start)
432 free_memmap(prev_bank_end, bank_start);
435 * Align up here since the VM subsystem insists that the
436 * memmap entries are valid from the bank end aligned to
437 * MAX_ORDER_NR_PAGES.
439 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
443 static void __init free_highpages(void)
445 #ifdef CONFIG_HIGHMEM
446 unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
449 /* set highmem page free */
450 for (i = j = 0; i < memblock.memory.cnt; i++) {
451 unsigned long start = memblock_start_pfn(&memblock.memory, i);
452 unsigned long end = memblock_end_pfn(&memblock.memory, i);
454 /* Ignore complete lowmem entries */
458 /* Truncate partial highmem entries */
462 /* Find and exclude any reserved regions */
463 for (; j < memblock.reserved.cnt; j++) {
464 unsigned long res_start;
465 unsigned long res_end;
467 res_start = memblock_start_pfn(&memblock.reserved, j);
468 res_end = res_start + PFN_UP(memblock_size_bytes(&memblock.reserved, j));
472 if (res_start < start)
478 if (res_start != start)
479 totalhigh_pages += free_area(start, res_start,
486 /* And now free anything which remains */
488 totalhigh_pages += free_area(start, end, NULL);
490 totalram_pages += totalhigh_pages;
495 * mem_init() marks the free areas in the mem_map and tells us how much
496 * memory is free. This is done after various parts of the system have
497 * claimed their memory after the kernel image.
499 void __init mem_init(void)
501 unsigned long reserved_pages, free_pages;
503 #ifdef CONFIG_HAVE_TCM
504 /* These pointers are filled in on TCM detection */
509 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
511 /* this will put all unused low memory onto the freelists */
512 free_unused_memmap(&meminfo);
514 totalram_pages += free_all_bootmem();
517 /* now that our DMA memory is actually so designated, we can free it */
518 totalram_pages += free_area(PHYS_PFN_OFFSET,
519 __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
524 reserved_pages = free_pages = 0;
526 for_each_bank(i, &meminfo) {
527 struct membank *bank = &meminfo.bank[i];
528 unsigned int pfn1, pfn2;
529 struct page *page, *end;
531 pfn1 = bank_pfn_start(bank);
532 pfn2 = bank_pfn_end(bank);
534 page = pfn_to_page(pfn1);
535 end = pfn_to_page(pfn2 - 1) + 1;
538 if (PageReserved(page))
540 else if (!page_count(page))
543 } while (page < end);
547 * Since our memory may not be contiguous, calculate the
548 * real number of pages we have in this system
550 printk(KERN_INFO "Memory:");
552 for (i = 0; i < memblock.memory.cnt; i++) {
553 unsigned long pages = memblock_size_pages(&memblock.memory, i);
554 num_physpages += pages;
555 printk(" %luMB", pages >> (20 - PAGE_SHIFT));
557 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
559 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
560 nr_free_pages() << (PAGE_SHIFT-10),
561 free_pages << (PAGE_SHIFT-10),
562 reserved_pages << (PAGE_SHIFT-10),
563 totalhigh_pages << (PAGE_SHIFT-10));
565 #define MLK(b, t) b, t, ((t) - (b)) >> 10
566 #define MLM(b, t) b, t, ((t) - (b)) >> 20
567 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
569 printk(KERN_NOTICE "Virtual kernel memory layout:\n"
570 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
571 #ifdef CONFIG_HAVE_TCM
572 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
573 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
575 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
577 " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n"
579 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
580 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
581 #ifdef CONFIG_HIGHMEM
582 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n"
584 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
585 " .init : 0x%p" " - 0x%p" " (%4d kB)\n"
586 " .text : 0x%p" " - 0x%p" " (%4d kB)\n"
587 " .data : 0x%p" " - 0x%p" " (%4d kB)\n",
589 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
591 #ifdef CONFIG_HAVE_TCM
592 MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
593 MLK(ITCM_OFFSET, (unsigned long) itcm_end),
595 MLK(FIXADDR_START, FIXADDR_TOP),
597 MLM(CONSISTENT_BASE, CONSISTENT_END),
599 MLM(VMALLOC_START, VMALLOC_END),
600 MLM(PAGE_OFFSET, (unsigned long)high_memory),
601 #ifdef CONFIG_HIGHMEM
602 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
605 MLM(MODULES_VADDR, MODULES_END),
607 MLK_ROUNDUP(__init_begin, __init_end),
608 MLK_ROUNDUP(_text, _etext),
609 MLK_ROUNDUP(_data, _edata));
616 * Check boundaries twice: Some fundamental inconsistencies can
617 * be detected at build time already.
620 BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE);
621 BUG_ON(VMALLOC_END > CONSISTENT_BASE);
623 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
624 BUG_ON(TASK_SIZE > MODULES_VADDR);
627 #ifdef CONFIG_HIGHMEM
628 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
629 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
632 if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
633 extern int sysctl_overcommit_memory;
635 * On a machine this small we won't get
636 * anywhere without overcommit, so turn
639 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
643 void free_initmem(void)
645 #ifdef CONFIG_HAVE_TCM
646 extern char __tcm_start, __tcm_end;
648 totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
649 __phys_to_pfn(__pa(&__tcm_end)),
653 if (!machine_is_integrator() && !machine_is_cintegrator())
654 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
655 __phys_to_pfn(__pa(__init_end)),
659 #ifdef CONFIG_BLK_DEV_INITRD
661 static int keep_initrd;
663 void free_initrd_mem(unsigned long start, unsigned long end)
666 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
667 __phys_to_pfn(__pa(end)),
671 static int __init keepinitrd_setup(char *__unused)
677 __setup("keepinitrd", keepinitrd_setup);