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>
20 #include <asm/mach-types.h>
21 #include <asm/sections.h>
22 #include <asm/setup.h>
23 #include <asm/sizes.h>
26 #include <asm/mach/arch.h>
27 #include <asm/mach/map.h>
31 static unsigned long phys_initrd_start __initdata = 0;
32 static unsigned long phys_initrd_size __initdata = 0;
34 static void __init early_initrd(char **p)
36 unsigned long start, size;
38 start = memparse(*p, p);
40 size = memparse((*p) + 1, p);
42 phys_initrd_start = start;
43 phys_initrd_size = size;
46 __early_param("initrd=", early_initrd);
48 static int __init parse_tag_initrd(const struct tag *tag)
50 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
51 "please update your bootloader.\n");
52 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
53 phys_initrd_size = tag->u.initrd.size;
57 __tagtable(ATAG_INITRD, parse_tag_initrd);
59 static int __init parse_tag_initrd2(const struct tag *tag)
61 phys_initrd_start = tag->u.initrd.start;
62 phys_initrd_size = tag->u.initrd.size;
66 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
69 * This keeps memory configuration data used by a couple memory
70 * initialization functions, as well as show_mem() for the skipping
71 * of holes in the memory map. It is populated by arm_add_memory().
73 struct meminfo meminfo;
77 int free = 0, total = 0, reserved = 0;
78 int shared = 0, cached = 0, slab = 0, node, i;
79 struct meminfo * mi = &meminfo;
81 printk("Mem-info:\n");
83 for_each_online_node(node) {
84 pg_data_t *n = NODE_DATA(node);
85 struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn;
87 for_each_nodebank (i,mi,node) {
88 struct membank *bank = &mi->bank[i];
89 unsigned int pfn1, pfn2;
90 struct page *page, *end;
92 pfn1 = bank_pfn_start(bank);
93 pfn2 = bank_pfn_end(bank);
100 if (PageReserved(page))
102 else if (PageSwapCache(page))
104 else if (PageSlab(page))
106 else if (!page_count(page))
109 shared += page_count(page) - 1;
111 } while (page < end);
115 printk("%d pages of RAM\n", total);
116 printk("%d free pages\n", free);
117 printk("%d reserved pages\n", reserved);
118 printk("%d slab pages\n", slab);
119 printk("%d pages shared\n", shared);
120 printk("%d pages swap cached\n", cached);
123 static void __init find_node_limits(int node, struct meminfo *mi,
124 unsigned long *min, unsigned long *max_low, unsigned long *max_high)
129 *max_low = *max_high = 0;
131 for_each_nodebank(i, mi, node) {
132 struct membank *bank = &mi->bank[i];
133 unsigned long start, end;
135 start = bank_pfn_start(bank);
136 end = bank_pfn_end(bank);
150 * FIXME: We really want to avoid allocating the bootmap bitmap
151 * over the top of the initrd. Hopefully, this is located towards
152 * the start of a bank, so if we allocate the bootmap bitmap at
153 * the end, we won't clash.
155 static unsigned int __init
156 find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
158 unsigned int start_pfn, i, bootmap_pfn;
160 start_pfn = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT;
163 for_each_nodebank(i, mi, node) {
164 struct membank *bank = &mi->bank[i];
165 unsigned int start, end;
167 start = bank_pfn_start(bank);
168 end = bank_pfn_end(bank);
173 if (start < start_pfn)
179 if (end - start >= bootmap_pages) {
185 if (bootmap_pfn == 0)
191 static int __init check_initrd(struct meminfo *mi)
193 int initrd_node = -2;
194 #ifdef CONFIG_BLK_DEV_INITRD
195 unsigned long end = phys_initrd_start + phys_initrd_size;
198 * Make sure that the initrd is within a valid area of
201 if (phys_initrd_size) {
206 for (i = 0; i < mi->nr_banks; i++) {
207 struct membank *bank = &mi->bank[i];
208 if (bank_phys_start(bank) <= phys_initrd_start &&
209 end <= bank_phys_end(bank))
210 initrd_node = bank->node;
214 if (initrd_node == -1) {
215 printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond "
216 "physical memory - disabling initrd\n",
217 phys_initrd_start, phys_initrd_size);
218 phys_initrd_start = phys_initrd_size = 0;
225 static inline void map_memory_bank(struct membank *bank)
230 map.pfn = bank_pfn_start(bank);
231 map.virtual = __phys_to_virt(bank_phys_start(bank));
232 map.length = bank_phys_size(bank);
233 map.type = MT_MEMORY;
235 create_mapping(&map);
239 static void __init bootmem_init_node(int node, struct meminfo *mi,
240 unsigned long start_pfn, unsigned long end_pfn)
242 unsigned long boot_pfn;
243 unsigned int boot_pages;
248 * Map the memory banks for this node.
250 for_each_nodebank(i, mi, node) {
251 struct membank *bank = &mi->bank[i];
254 map_memory_bank(bank);
258 * Allocate the bootmem bitmap page.
260 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
261 boot_pfn = find_bootmap_pfn(node, mi, boot_pages);
264 * Initialise the bootmem allocator for this node, handing the
265 * memory banks over to bootmem.
267 node_set_online(node);
268 pgdat = NODE_DATA(node);
269 init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);
271 for_each_nodebank(i, mi, node) {
272 struct membank *bank = &mi->bank[i];
274 free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank));
275 memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank));
279 * Reserve the bootmem bitmap for this node.
281 reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
282 boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
285 static void __init bootmem_reserve_initrd(int node)
287 #ifdef CONFIG_BLK_DEV_INITRD
288 pg_data_t *pgdat = NODE_DATA(node);
291 res = reserve_bootmem_node(pgdat, phys_initrd_start,
292 phys_initrd_size, BOOTMEM_EXCLUSIVE);
295 initrd_start = __phys_to_virt(phys_initrd_start);
296 initrd_end = initrd_start + phys_initrd_size;
299 "INITRD: 0x%08lx+0x%08lx overlaps in-use "
300 "memory region - disabling initrd\n",
301 phys_initrd_start, phys_initrd_size);
306 static void __init bootmem_free_node(int node, struct meminfo *mi)
308 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
309 unsigned long min, max_low, max_high;
312 find_node_limits(node, mi, &min, &max_low, &max_high);
315 * initialise the zones within this node.
317 memset(zone_size, 0, sizeof(zone_size));
320 * The size of this node has already been determined. If we need
321 * to do anything fancy with the allocation of this memory to the
322 * zones, now is the time to do it.
324 zone_size[0] = max_low - min;
325 #ifdef CONFIG_HIGHMEM
326 zone_size[ZONE_HIGHMEM] = max_high - max_low;
330 * For each bank in this node, calculate the size of the holes.
331 * holes = node_size - sum(bank_sizes_in_node)
333 memcpy(zhole_size, zone_size, sizeof(zhole_size));
334 for_each_nodebank(i, mi, node) {
336 #ifdef CONFIG_HIGHMEM
337 if (mi->bank[i].highmem)
340 zhole_size[idx] -= bank_pfn_size(&mi->bank[i]);
344 * Adjust the sizes according to any special requirements for
347 arch_adjust_zones(node, zone_size, zhole_size);
349 free_area_init_node(node, zone_size, min, zhole_size);
352 void __init bootmem_init(void)
354 struct meminfo *mi = &meminfo;
355 unsigned long min, max_low, max_high;
356 int node, initrd_node;
359 * Locate which node contains the ramdisk image, if any.
361 initrd_node = check_initrd(mi);
363 max_low = max_high = 0;
366 * Run through each node initialising the bootmem allocator.
368 for_each_node(node) {
369 unsigned long node_low, node_high;
371 find_node_limits(node, mi, &min, &node_low, &node_high);
373 if (node_low > max_low)
375 if (node_high > max_high)
376 max_high = node_high;
379 * If there is no memory in this node, ignore it.
380 * (We can't have nodes which have no lowmem)
385 bootmem_init_node(node, mi, min, node_low);
388 * Reserve any special node zero regions.
391 reserve_node_zero(NODE_DATA(node));
394 * If the initrd is in this node, reserve its memory.
396 if (node == initrd_node)
397 bootmem_reserve_initrd(node);
401 * sparse_init() needs the bootmem allocator up and running.
406 * Now free memory in each node - free_area_init_node needs
407 * the sparse mem_map arrays initialized by sparse_init()
408 * for memmap_init_zone(), otherwise all PFNs are invalid.
411 bootmem_free_node(node, mi);
413 high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
416 * This doesn't seem to be used by the Linux memory manager any
417 * more, but is used by ll_rw_block. If we can get rid of it, we
418 * also get rid of some of the stuff above as well.
420 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
421 * the system, not the maximum PFN.
423 max_low_pfn = max_low - PHYS_PFN_OFFSET;
424 max_pfn = max_high - PHYS_PFN_OFFSET;
427 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
429 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
431 for (; pfn < end; pfn++) {
432 struct page *page = pfn_to_page(pfn);
433 ClearPageReserved(page);
434 init_page_count(page);
440 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
446 free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn)
448 struct page *start_pg, *end_pg;
449 unsigned long pg, pgend;
452 * Convert start_pfn/end_pfn to a struct page pointer.
454 start_pg = pfn_to_page(start_pfn);
455 end_pg = pfn_to_page(end_pfn);
458 * Convert to physical addresses, and
459 * round start upwards and end downwards.
461 pg = PAGE_ALIGN(__pa(start_pg));
462 pgend = __pa(end_pg) & PAGE_MASK;
465 * If there are free pages between these,
466 * free the section of the memmap array.
469 free_bootmem_node(NODE_DATA(node), pg, pgend - pg);
473 * The mem_map array can get very big. Free the unused area of the memory map.
475 static void __init free_unused_memmap_node(int node, struct meminfo *mi)
477 unsigned long bank_start, prev_bank_end = 0;
481 * [FIXME] This relies on each bank being in address order. This
482 * may not be the case, especially if the user has provided the
483 * information on the command line.
485 for_each_nodebank(i, mi, node) {
486 struct membank *bank = &mi->bank[i];
488 bank_start = bank_pfn_start(bank);
489 if (bank_start < prev_bank_end) {
490 printk(KERN_ERR "MEM: unordered memory banks. "
491 "Not freeing memmap.\n");
496 * If we had a previous bank, and there is a space
497 * between the current bank and the previous, free it.
499 if (prev_bank_end && prev_bank_end != bank_start)
500 free_memmap(node, prev_bank_end, bank_start);
502 prev_bank_end = bank_pfn_end(bank);
507 * mem_init() marks the free areas in the mem_map and tells us how much
508 * memory is free. This is done after various parts of the system have
509 * claimed their memory after the kernel image.
511 void __init mem_init(void)
513 unsigned int codesize, datasize, initsize;
516 #ifndef CONFIG_DISCONTIGMEM
517 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
520 /* this will put all unused low memory onto the freelists */
521 for_each_online_node(node) {
522 pg_data_t *pgdat = NODE_DATA(node);
524 free_unused_memmap_node(node, &meminfo);
526 if (pgdat->node_spanned_pages != 0)
527 totalram_pages += free_all_bootmem_node(pgdat);
531 /* now that our DMA memory is actually so designated, we can free it */
532 totalram_pages += free_area(PHYS_PFN_OFFSET,
533 __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
536 #ifdef CONFIG_HIGHMEM
537 /* set highmem page free */
538 for_each_online_node(node) {
539 for_each_nodebank (i, &meminfo, node) {
540 unsigned long start = bank_pfn_start(&meminfo.bank[i]);
541 unsigned long end = bank_pfn_end(&meminfo.bank[i]);
542 if (start >= max_low_pfn + PHYS_PFN_OFFSET)
543 totalhigh_pages += free_area(start, end, NULL);
546 totalram_pages += totalhigh_pages;
550 * Since our memory may not be contiguous, calculate the
551 * real number of pages we have in this system
553 printk(KERN_INFO "Memory:");
555 for (i = 0; i < meminfo.nr_banks; i++) {
556 num_physpages += bank_pfn_size(&meminfo.bank[i]);
557 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
559 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
561 codesize = _etext - _text;
562 datasize = _end - _data;
563 initsize = __init_end - __init_begin;
565 printk(KERN_NOTICE "Memory: %luKB available (%dK code, "
566 "%dK data, %dK init, %luK highmem)\n",
567 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
568 codesize >> 10, datasize >> 10, initsize >> 10,
569 (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
571 if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
572 extern int sysctl_overcommit_memory;
574 * On a machine this small we won't get
575 * anywhere without overcommit, so turn
578 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
582 void free_initmem(void)
584 if (!machine_is_integrator() && !machine_is_cintegrator())
585 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
586 __phys_to_pfn(__pa(__init_end)),
590 #ifdef CONFIG_BLK_DEV_INITRD
592 static int keep_initrd;
594 void free_initrd_mem(unsigned long start, unsigned long end)
597 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
598 __phys_to_pfn(__pa(end)),
602 static int __init keepinitrd_setup(char *__unused)
608 __setup("keepinitrd", keepinitrd_setup);