[linux-block.git] / arch / arm / mm / init.c

/*
 *  linux/arch/arm/mm/init.c
 *
 *  Copyright (C) 1995-2005 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/swap.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mman.h>
#include <linux/nodemask.h>
#include <linux/initrd.h>

#include <asm/mach-types.h>
#include <asm/setup.h>
#include <asm/sizes.h>
#include <asm/tlb.h>

#include <asm/mach/arch.h>
#include <asm/mach/map.h>

#include "mm.h"

static unsigned long phys_initrd_start __initdata = 0;
static unsigned long phys_initrd_size __initdata = 0;

static void __init early_initrd(char **p)
{
	unsigned long start, size;

	start = memparse(*p, p);
	if (**p == ',') {
		size = memparse((*p) + 1, p);

		phys_initrd_start = start;
		phys_initrd_size = size;
	}
}
__early_param("initrd=", early_initrd);

static int __init parse_tag_initrd(const struct tag *tag)
{
	printk(KERN_WARNING "ATAG_INITRD is deprecated; "
		"please update your bootloader.\n");
	phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
	phys_initrd_size = tag->u.initrd.size;
	return 0;
}

__tagtable(ATAG_INITRD, parse_tag_initrd);

static int __init parse_tag_initrd2(const struct tag *tag)
{
	phys_initrd_start = tag->u.initrd.start;
	phys_initrd_size = tag->u.initrd.size;
	return 0;
}

__tagtable(ATAG_INITRD2, parse_tag_initrd2);

/*
 * This is used to pass memory configuration data from paging_init
 * to mem_init, and by show_mem() to skip holes in the memory map.
 */
static struct meminfo meminfo = { 0, };

void show_mem(void)
{
	int free = 0, total = 0, reserved = 0;
	int shared = 0, cached = 0, slab = 0, node, i;
	struct meminfo * mi = &meminfo;

	printk("Mem-info:\n");
	show_free_areas();
	for_each_online_node(node) {
		pg_data_t *n = NODE_DATA(node);
		struct page *map = n->node_mem_map - n->node_start_pfn;

		for_each_nodebank (i,mi,node) {
			struct membank *bank = &mi->bank[i];
			unsigned int pfn1, pfn2;
			struct page *page, *end;

			pfn1 = bank_pfn_start(bank);
			pfn2 = bank_pfn_end(bank);

			page = map + pfn1;
			end  = map + pfn2;

			do {
				total++;
				if (PageReserved(page))
					reserved++;
				else if (PageSwapCache(page))
					cached++;
				else if (PageSlab(page))
					slab++;
				else if (!page_count(page))
					free++;
				else
					shared += page_count(page) - 1;
				page++;
			} while (page < end);
		}
	}

	printk("%d pages of RAM\n", total);
	printk("%d free pages\n", free);
	printk("%d reserved pages\n", reserved);
	printk("%d slab pages\n", slab);
	printk("%d pages shared\n", shared);
	printk("%d pages swap cached\n", cached);
}

/*
 * FIXME: We really want to avoid allocating the bootmap bitmap
 * over the top of the initrd.  Hopefully, this is located towards
 * the start of a bank, so if we allocate the bootmap bitmap at
 * the end, we won't clash.
 */
static unsigned int __init
find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
{
	unsigned int start_pfn, i, bootmap_pfn;

	start_pfn   = PAGE_ALIGN(__pa(&_end)) >> PAGE_SHIFT;
	bootmap_pfn = 0;

	for_each_nodebank(i, mi, node) {
		struct membank *bank = &mi->bank[i];
		unsigned int start, end;

		start = bank_pfn_start(bank);
		end   = bank_pfn_end(bank);

		if (end < start_pfn)
			continue;

		if (start < start_pfn)
			start = start_pfn;

		if (end <= start)
			continue;

		if (end - start >= bootmap_pages) {
			bootmap_pfn = start;
			break;
		}
	}

	if (bootmap_pfn == 0)
		BUG();

	return bootmap_pfn;
}

static int __init check_initrd(struct meminfo *mi)
{
	int initrd_node = -2;
#ifdef CONFIG_BLK_DEV_INITRD
	unsigned long end = phys_initrd_start + phys_initrd_size;

	/*
	 * Make sure that the initrd is within a valid area of
	 * memory.
	 */
	if (phys_initrd_size) {
		unsigned int i;

		initrd_node = -1;

		for (i = 0; i < mi->nr_banks; i++) {
			struct membank *bank = &mi->bank[i];
			if (bank_phys_start(bank) <= phys_initrd_start &&
			    end <= bank_phys_end(bank))
				initrd_node = bank->node;
		}
	}

	if (initrd_node == -1) {
		printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond "
		       "physical memory - disabling initrd\n",
		       phys_initrd_start, phys_initrd_size);
		phys_initrd_start = phys_initrd_size = 0;
	}
#endif

	return initrd_node;
}

static inline void map_memory_bank(struct membank *bank)
{
#ifdef CONFIG_MMU
	struct map_desc map;

	map.pfn = bank_pfn_start(bank);
	map.virtual = __phys_to_virt(bank_phys_start(bank));
	map.length = bank_phys_size(bank);
	map.type = MT_MEMORY;

	create_mapping(&map);
#endif
}

static unsigned long __init
bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
{
	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
	unsigned long start_pfn, end_pfn, boot_pfn;
	unsigned int boot_pages;
	pg_data_t *pgdat;
	int i;

	start_pfn = -1UL;
	end_pfn = 0;

	/*
	 * Calculate the pfn range, and map the memory banks for this node.
	 */
	for_each_nodebank(i, mi, node) {
		struct membank *bank = &mi->bank[i];
		unsigned long start, end;

		start = bank_pfn_start(bank);
		end = bank_pfn_end(bank);

		if (start_pfn > start)
			start_pfn = start;
		if (end_pfn < end)
			end_pfn = end;

		map_memory_bank(bank);
	}

	/*
	 * If there is no memory in this node, ignore it.
	 */
	if (end_pfn == 0)
		return end_pfn;

	/*
	 * Allocate the bootmem bitmap page.
	 */
	boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
	boot_pfn = find_bootmap_pfn(node, mi, boot_pages);

	/*
	 * Initialise the bootmem allocator for this node, handing the
	 * memory banks over to bootmem.
	 */
	node_set_online(node);
	pgdat = NODE_DATA(node);
	init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);

	for_each_nodebank(i, mi, node) {
		struct membank *bank = &mi->bank[i];
		free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank));
	}

	/*
	 * Reserve the bootmem bitmap for this node.
	 */
	reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
			     boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);

	/*
	 * Reserve any special node zero regions.
	 */
	if (node == 0)
		reserve_node_zero(pgdat);

#ifdef CONFIG_BLK_DEV_INITRD
	/*
	 * If the initrd is in this node, reserve its memory.
	 */
	if (node == initrd_node) {
		int res = reserve_bootmem_node(pgdat, phys_initrd_start,
				     phys_initrd_size, BOOTMEM_EXCLUSIVE);

		if (res == 0) {
			initrd_start = __phys_to_virt(phys_initrd_start);
			initrd_end = initrd_start + phys_initrd_size;
		} else {
			printk(KERN_ERR
				"INITRD: 0x%08lx+0x%08lx overlaps in-use "
				"memory region - disabling initrd\n",
				phys_initrd_start, phys_initrd_size);
		}
	}
#endif

	/*
	 * initialise the zones within this node.
	 */
	memset(zone_size, 0, sizeof(zone_size));
	memset(zhole_size, 0, sizeof(zhole_size));

	/*
	 * The size of this node has already been determined.  If we need
	 * to do anything fancy with the allocation of this memory to the
	 * zones, now is the time to do it.
	 */
	zone_size[0] = end_pfn - start_pfn;

	/*
	 * For each bank in this node, calculate the size of the holes.
	 *  holes = node_size - sum(bank_sizes_in_node)
	 */
	zhole_size[0] = zone_size[0];
	for_each_nodebank(i, mi, node)
		zhole_size[0] -= bank_pfn_size(&mi->bank[i]);

	/*
	 * Adjust the sizes according to any special requirements for
	 * this machine type.
	 */
	arch_adjust_zones(node, zone_size, zhole_size);

	free_area_init_node(node, zone_size, start_pfn, zhole_size);

	return end_pfn;
}

void __init bootmem_init(struct meminfo *mi)
{
	unsigned long memend_pfn = 0;
	int node, initrd_node;

	memcpy(&meminfo, mi, sizeof(meminfo));

	/*
	 * Locate which node contains the ramdisk image, if any.
	 */
	initrd_node = check_initrd(mi);

	/*
	 * Run through each node initialising the bootmem allocator.
	 */
	for_each_node(node) {
		unsigned long end_pfn;

		end_pfn = bootmem_init_node(node, initrd_node, mi);

		/*
		 * Remember the highest memory PFN.
		 */
		if (end_pfn > memend_pfn)
			memend_pfn = end_pfn;
	}

	high_memory = __va(memend_pfn << PAGE_SHIFT);

	/*
	 * This doesn't seem to be used by the Linux memory manager any
	 * more, but is used by ll_rw_block.  If we can get rid of it, we
	 * also get rid of some of the stuff above as well.
	 *
	 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
	 * the system, not the maximum PFN.
	 */
	max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET;
}

static inline void free_area(unsigned long addr, unsigned long end, char *s)
{
	unsigned int size = (end - addr) >> 10;

	for (; addr < end; addr += PAGE_SIZE) {
		struct page *page = virt_to_page(addr);
		ClearPageReserved(page);
		init_page_count(page);
		free_page(addr);
		totalram_pages++;
	}

	if (size && s)
		printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
}

static inline void
free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn)
{
	struct page *start_pg, *end_pg;
	unsigned long pg, pgend;

	/*
	 * Convert start_pfn/end_pfn to a struct page pointer.
	 */
	start_pg = pfn_to_page(start_pfn);
	end_pg = pfn_to_page(end_pfn);

	/*
	 * Convert to physical addresses, and
	 * round start upwards and end downwards.
	 */
	pg = PAGE_ALIGN(__pa(start_pg));
	pgend = __pa(end_pg) & PAGE_MASK;

	/*
	 * If there are free pages between these,
	 * free the section of the memmap array.
	 */
	if (pg < pgend)
		free_bootmem_node(NODE_DATA(node), pg, pgend - pg);
}

/*
 * The mem_map array can get very big.  Free the unused area of the memory map.
 */
static void __init free_unused_memmap_node(int node, struct meminfo *mi)
{
	unsigned long bank_start, prev_bank_end = 0;
	unsigned int i;

	/*
	 * [FIXME] This relies on each bank being in address order.  This
	 * may not be the case, especially if the user has provided the
	 * information on the command line.
	 */
	for_each_nodebank(i, mi, node) {
		struct membank *bank = &mi->bank[i];

		bank_start = bank_pfn_start(bank);
		if (bank_start < prev_bank_end) {
			printk(KERN_ERR "MEM: unordered memory banks.  "
				"Not freeing memmap.\n");
			break;
		}

		/*
		 * If we had a previous bank, and there is a space
		 * between the current bank and the previous, free it.
		 */
		if (prev_bank_end && prev_bank_end != bank_start)
			free_memmap(node, prev_bank_end, bank_start);

		prev_bank_end = bank_pfn_end(bank);
	}
}

/*
 * mem_init() marks the free areas in the mem_map and tells us how much
 * memory is free.  This is done after various parts of the system have
 * claimed their memory after the kernel image.
 */
void __init mem_init(void)
{
	unsigned int codepages, datapages, initpages;
	int i, node;

	codepages = &_etext - &_text;
	datapages = &_end - &__data_start;
	initpages = &__init_end - &__init_begin;

#ifndef CONFIG_DISCONTIGMEM
	max_mapnr   = virt_to_page(high_memory) - mem_map;
#endif

	/* this will put all unused low memory onto the freelists */
	for_each_online_node(node) {
		pg_data_t *pgdat = NODE_DATA(node);

		free_unused_memmap_node(node, &meminfo);

		if (pgdat->node_spanned_pages != 0)
			totalram_pages += free_all_bootmem_node(pgdat);
	}

#ifdef CONFIG_SA1111
	/* now that our DMA memory is actually so designated, we can free it */
	free_area(PAGE_OFFSET, (unsigned long)swapper_pg_dir, NULL);
#endif

	/*
	 * Since our memory may not be contiguous, calculate the
	 * real number of pages we have in this system
	 */
	printk(KERN_INFO "Memory:");

	num_physpages = 0;
	for (i = 0; i < meminfo.nr_banks; i++) {
		num_physpages += bank_pfn_size(&meminfo.bank[i]);
		printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
	}

	printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
	printk(KERN_NOTICE "Memory: %luKB available (%dK code, "
		"%dK data, %dK init)\n",
		(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
		codepages >> 10, datapages >> 10, initpages >> 10);

	if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
		extern int sysctl_overcommit_memory;
		/*
		 * On a machine this small we won't get
		 * anywhere without overcommit, so turn
		 * it on by default.
		 */
		sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
	}
}

void free_initmem(void)
{
	if (!machine_is_integrator() && !machine_is_cintegrator()) {
		free_area((unsigned long)(&__init_begin),
			  (unsigned long)(&__init_end),
			  "init");
	}
}

#ifdef CONFIG_BLK_DEV_INITRD

static int keep_initrd;

void free_initrd_mem(unsigned long start, unsigned long end)
{
	if (!keep_initrd)
		free_area(start, end, "initrd");
}

static int __init keepinitrd_setup(char *__unused)
{
	keep_initrd = 1;
	return 1;
}

__setup("keepinitrd", keepinitrd_setup);
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/arm/mm/init.c
	3	*
90072059	4	* Copyright (C) 1995-2005 Russell King
1da177e4 LT	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	*/
1da177e4 LT	10	#include <linux/kernel.h>
1da177e4 LT	11	#include <linux/errno.h>
1da177e4 LT	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
	19	#include <asm/mach-types.h>
1da177e4	20	#include <asm/setup.h>
74d02fb9	21	#include <asm/sizes.h>
1da177e4 LT	22	#include <asm/tlb.h>
	23
	24	#include <asm/mach/arch.h>
	25	#include <asm/mach/map.h>
	26
1b2e2b73 RK	27	#include "mm.h"
1b2e2b73 RK	28
012d1f4a RK	29	static unsigned long phys_initrd_start __initdata = 0;
	30	static unsigned long phys_initrd_size __initdata = 0;
	31
	32	static void __init early_initrd(char **p)
	33	{
	34	unsigned long start, size;
	35
	36	start = memparse(*p, p);
	37	if (**p == ',') {
	38	size = memparse((*p) + 1, p);
	39
	40	phys_initrd_start = start;
	41	phys_initrd_size = size;
	42	}
	43	}
	44	__early_param("initrd=", early_initrd);
	45
	46	static int __init parse_tag_initrd(const struct tag *tag)
	47	{
	48	printk(KERN_WARNING "ATAG_INITRD is deprecated; "
	49	"please update your bootloader.\n");
	50	phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
	51	phys_initrd_size = tag->u.initrd.size;
	52	return 0;
	53	}
	54
	55	__tagtable(ATAG_INITRD, parse_tag_initrd);
	56
	57	static int __init parse_tag_initrd2(const struct tag *tag)
	58	{
	59	phys_initrd_start = tag->u.initrd.start;
	60	phys_initrd_size = tag->u.initrd.size;
	61	return 0;
	62	}
	63
	64	__tagtable(ATAG_INITRD2, parse_tag_initrd2);
1da177e4 LT	65
1da177e4 LT	66	/*
5e709827 RL	67	* This is used to pass memory configuration data from paging_init
5e709827 RL	68	* to mem_init, and by show_mem() to skip holes in the memory map.
1da177e4	69	*/
5e709827 RL	70	static struct meminfo meminfo = { 0, };
5e709827 RL	71
1da177e4 LT	72	void show_mem(void)
	73	{
	74	int free = 0, total = 0, reserved = 0;
5e709827 RL	75	int shared = 0, cached = 0, slab = 0, node, i;
5e709827 RL	76	struct meminfo * mi = &meminfo;
1da177e4 LT	77
	78	printk("Mem-info:\n");
	79	show_free_areas();
1da177e4	80	for_each_online_node(node) {
204ecae4 RK	81	pg_data_t *n = NODE_DATA(node);
	82	struct page *map = n->node_mem_map - n->node_start_pfn;
	83
5e709827	84	for_each_nodebank (i,mi,node) {
d2a38ef9	85	struct membank *bank = &mi->bank[i];
5e709827 RL	86	unsigned int pfn1, pfn2;
	87	struct page page, end;
	88
d2a38ef9 RK	89	pfn1 = bank_pfn_start(bank);
d2a38ef9 RK	90	pfn2 = bank_pfn_end(bank);
5e709827	91
204ecae4 RK	92	page = map + pfn1;
204ecae4 RK	93	end = map + pfn2;
5e709827 RL	94
	95	do {
	96	total++;
	97	if (PageReserved(page))
	98	reserved++;
	99	else if (PageSwapCache(page))
	100	cached++;
	101	else if (PageSlab(page))
	102	slab++;
	103	else if (!page_count(page))
	104	free++;
	105	else
	106	shared += page_count(page) - 1;
	107	page++;
	108	} while (page < end);
	109	}
1da177e4 LT	110	}
	111
	112	printk("%d pages of RAM\n", total);
	113	printk("%d free pages\n", free);
	114	printk("%d reserved pages\n", reserved);
	115	printk("%d slab pages\n", slab);
	116	printk("%d pages shared\n", shared);
	117	printk("%d pages swap cached\n", cached);
	118	}
	119
1da177e4 LT	120	/*
	121	* FIXME: We really want to avoid allocating the bootmap bitmap
	122	* over the top of the initrd. Hopefully, this is located towards
	123	* the start of a bank, so if we allocate the bootmap bitmap at
	124	* the end, we won't clash.
	125	*/
	126	static unsigned int __init
	127	find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
	128	{
d2a38ef9	129	unsigned int start_pfn, i, bootmap_pfn;
1da177e4	130
90072059	131	start_pfn = PAGE_ALIGN(__pa(&_end)) >> PAGE_SHIFT;
1da177e4 LT	132	bootmap_pfn = 0;
1da177e4 LT	133
d2a38ef9 RK	134	for_each_nodebank(i, mi, node) {
d2a38ef9 RK	135	struct membank *bank = &mi->bank[i];
1da177e4 LT	136	unsigned int start, end;
1da177e4 LT	137
d2a38ef9 RK	138	start = bank_pfn_start(bank);
d2a38ef9 RK	139	end = bank_pfn_end(bank);
1da177e4 LT	140
	141	if (end < start_pfn)
	142	continue;
	143
	144	if (start < start_pfn)
	145	start = start_pfn;
	146
	147	if (end <= start)
	148	continue;
	149
	150	if (end - start >= bootmap_pages) {
	151	bootmap_pfn = start;
	152	break;
	153	}
	154	}
	155
	156	if (bootmap_pfn == 0)
	157	BUG();
	158
	159	return bootmap_pfn;
	160	}
	161
1da177e4 LT	162	static int __init check_initrd(struct meminfo *mi)
	163	{
	164	int initrd_node = -2;
	165	#ifdef CONFIG_BLK_DEV_INITRD
	166	unsigned long end = phys_initrd_start + phys_initrd_size;
	167
	168	/*
	169	* Make sure that the initrd is within a valid area of
	170	* memory.
	171	*/
	172	if (phys_initrd_size) {
	173	unsigned int i;
	174
	175	initrd_node = -1;
	176
	177	for (i = 0; i < mi->nr_banks; i++) {
d2a38ef9 RK	178	struct membank *bank = &mi->bank[i];
	179	if (bank_phys_start(bank) <= phys_initrd_start &&
	180	end <= bank_phys_end(bank))
	181	initrd_node = bank->node;
1da177e4 LT	182	}
	183	}
	184
	185	if (initrd_node == -1) {
b962a286	186	printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond "
1da177e4	187	"physical memory - disabling initrd\n",
b962a286	188	phys_initrd_start, phys_initrd_size);
1da177e4 LT	189	phys_initrd_start = phys_initrd_size = 0;
	190	}
	191	#endif
	192
	193	return initrd_node;
	194	}
	195
456335e2 RK	196	static inline void map_memory_bank(struct membank *bank)
456335e2 RK	197	{
d111e8f9	198	#ifdef CONFIG_MMU
456335e2 RK	199	struct map_desc map;
456335e2 RK	200
d2a38ef9 RK	201	map.pfn = bank_pfn_start(bank);
	202	map.virtual = __phys_to_virt(bank_phys_start(bank));
	203	map.length = bank_phys_size(bank);
456335e2 RK	204	map.type = MT_MEMORY;
	205
	206	create_mapping(&map);
d111e8f9	207	#endif
456335e2 RK	208	}
456335e2 RK	209
90072059 RK	210	static unsigned long __init
90072059 RK	211	bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
1da177e4	212	{
90072059 RK	213	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
	214	unsigned long start_pfn, end_pfn, boot_pfn;
	215	unsigned int boot_pages;
	216	pg_data_t *pgdat;
	217	int i;
1da177e4	218
90072059 RK	219	start_pfn = -1UL;
90072059 RK	220	end_pfn = 0;
1da177e4	221
90072059 RK	222	/*
	223	* Calculate the pfn range, and map the memory banks for this node.
	224	*/
	225	for_each_nodebank(i, mi, node) {
456335e2	226	struct membank *bank = &mi->bank[i];
90072059	227	unsigned long start, end;
1da177e4	228
d2a38ef9 RK	229	start = bank_pfn_start(bank);
d2a38ef9 RK	230	end = bank_pfn_end(bank);
1da177e4	231
90072059 RK	232	if (start_pfn > start)
	233	start_pfn = start;
	234	if (end_pfn < end)
	235	end_pfn = end;
	236
456335e2	237	map_memory_bank(bank);
90072059	238	}
1da177e4 LT	239
1da177e4 LT	240	/*
90072059	241	* If there is no memory in this node, ignore it.
1da177e4	242	*/
90072059 RK	243	if (end_pfn == 0)
90072059 RK	244	return end_pfn;
1da177e4	245
90072059 RK	246	/*
	247	* Allocate the bootmem bitmap page.
	248	*/
	249	boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
	250	boot_pfn = find_bootmap_pfn(node, mi, boot_pages);
1da177e4	251
90072059 RK	252	/*
	253	* Initialise the bootmem allocator for this node, handing the
	254	* memory banks over to bootmem.
	255	*/
	256	node_set_online(node);
	257	pgdat = NODE_DATA(node);
	258	init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);
1da177e4	259
d2a38ef9 RK	260	for_each_nodebank(i, mi, node) {
	261	struct membank *bank = &mi->bank[i];
	262	free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank));
	263	}
90072059 RK	264
	265	/*
	266	* Reserve the bootmem bitmap for this node.
	267	*/
	268	reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
72a7fe39	269	boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
1da177e4	270
b962a286 RK	271	/*
	272	* Reserve any special node zero regions.
	273	*/
	274	if (node == 0)
	275	reserve_node_zero(pgdat);
	276
1da177e4	277	#ifdef CONFIG_BLK_DEV_INITRD
90072059 RK	278	/*
	279	* If the initrd is in this node, reserve its memory.
	280	*/
	281	if (node == initrd_node) {
b962a286 RK	282	int res = reserve_bootmem_node(pgdat, phys_initrd_start,
	283	phys_initrd_size, BOOTMEM_EXCLUSIVE);
	284
	285	if (res == 0) {
	286	initrd_start = __phys_to_virt(phys_initrd_start);
	287	initrd_end = initrd_start + phys_initrd_size;
	288	} else {
	289	printk(KERN_ERR
	290	"INITRD: 0x%08lx+0x%08lx overlaps in-use "
	291	"memory region - disabling initrd\n",
	292	phys_initrd_start, phys_initrd_size);
	293	}
1da177e4 LT	294	}
	295	#endif
	296
90072059 RK	297	/*
	298	* initialise the zones within this node.
	299	*/
	300	memset(zone_size, 0, sizeof(zone_size));
	301	memset(zhole_size, 0, sizeof(zhole_size));
	302
	303	/*
	304	* The size of this node has already been determined. If we need
	305	* to do anything fancy with the allocation of this memory to the
	306	* zones, now is the time to do it.
	307	*/
	308	zone_size[0] = end_pfn - start_pfn;
	309
	310	/*
	311	* For each bank in this node, calculate the size of the holes.
	312	* holes = node_size - sum(bank_sizes_in_node)
	313	*/
	314	zhole_size[0] = zone_size[0];
	315	for_each_nodebank(i, mi, node)
d2a38ef9	316	zhole_size[0] -= bank_pfn_size(&mi->bank[i]);
90072059 RK	317
	318	/*
	319	* Adjust the sizes according to any special requirements for
	320	* this machine type.
	321	*/
	322	arch_adjust_zones(node, zone_size, zhole_size);
	323
9109fb7b	324	free_area_init_node(node, zone_size, start_pfn, zhole_size);
90072059 RK	325
90072059 RK	326	return end_pfn;
1da177e4 LT	327	}
1da177e4 LT	328
d111e8f9	329	void __init bootmem_init(struct meminfo *mi)
1da177e4	330	{
456335e2	331	unsigned long memend_pfn = 0;
eca73214	332	int node, initrd_node;
1da177e4 LT	333
	334	memcpy(&meminfo, mi, sizeof(meminfo));
	335
1da177e4	336	/*
90072059	337	* Locate which node contains the ramdisk image, if any.
1da177e4	338	*/
90072059	339	initrd_node = check_initrd(mi);
1da177e4	340
90072059 RK	341	/*
	342	* Run through each node initialising the bootmem allocator.
	343	*/
	344	for_each_node(node) {
	345	unsigned long end_pfn;
1da177e4	346
90072059	347	end_pfn = bootmem_init_node(node, initrd_node, mi);
1da177e4 LT	348
1da177e4 LT	349	/*
90072059	350	* Remember the highest memory PFN.
1da177e4	351	*/
90072059 RK	352	if (end_pfn > memend_pfn)
	353	memend_pfn = end_pfn;
	354	}
1da177e4	355
90072059	356	high_memory = __va(memend_pfn << PAGE_SHIFT);
1da177e4	357
90072059 RK	358	/*
	359	* This doesn't seem to be used by the Linux memory manager any
	360	* more, but is used by ll_rw_block. If we can get rid of it, we
	361	* also get rid of some of the stuff above as well.
	362	*
	363	* Note: max_low_pfn and max_pfn reflect the number of _pages_ in
	364	* the system, not the maximum PFN.
	365	*/
	366	max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET;
	367	}
1da177e4	368
1da177e4 LT	369	static inline void free_area(unsigned long addr, unsigned long end, char *s)
	370	{
	371	unsigned int size = (end - addr) >> 10;
	372
	373	for (; addr < end; addr += PAGE_SIZE) {
	374	struct page *page = virt_to_page(addr);
	375	ClearPageReserved(page);
7835e98b	376	init_page_count(page);
1da177e4 LT	377	free_page(addr);
	378	totalram_pages++;
	379	}
	380
	381	if (size && s)
	382	printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
	383	}
	384
a013053d RK	385	static inline void
	386	free_memmap(int node, 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);
	395	end_pg = pfn_to_page(end_pfn);
	396
	397	/*
	398	* Convert to physical addresses, and
	399	* round start upwards and end downwards.
	400	*/
	401	pg = PAGE_ALIGN(__pa(start_pg));
	402	pgend = __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_node(NODE_DATA(node), 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_node(int node, struct meminfo *mi)
	416	{
	417	unsigned long bank_start, prev_bank_end = 0;
	418	unsigned int i;
	419
	420	/*
	421	* [FIXME] This relies on each bank being in address order. This
	422	* may not be the case, especially if the user has provided the
	423	* information on the command line.
	424	*/
90072059	425	for_each_nodebank(i, mi, node) {
d2a38ef9 RK	426	struct membank *bank = &mi->bank[i];
	427
	428	bank_start = bank_pfn_start(bank);
a013053d RK	429	if (bank_start < prev_bank_end) {
	430	printk(KERN_ERR "MEM: unordered memory banks. "
	431	"Not freeing memmap.\n");
	432	break;
	433	}
	434
	435	/*
	436	* If we had a previous bank, and there is a space
	437	* between the current bank and the previous, free it.
	438	*/
	439	if (prev_bank_end && prev_bank_end != bank_start)
	440	free_memmap(node, prev_bank_end, bank_start);
	441
d2a38ef9	442	prev_bank_end = bank_pfn_end(bank);
a013053d RK	443	}
	444	}
	445
1da177e4 LT	446	/*
	447	* mem_init() marks the free areas in the mem_map and tells us how much
	448	* memory is free. This is done after various parts of the system have
	449	* claimed their memory after the kernel image.
	450	*/
	451	void __init mem_init(void)
	452	{
	453	unsigned int codepages, datapages, initpages;
	454	int i, node;
	455
	456	codepages = &_etext - &_text;
	457	datapages = &_end - &__data_start;
	458	initpages = &__init_end - &__init_begin;
	459
	460	#ifndef CONFIG_DISCONTIGMEM
	461	max_mapnr = virt_to_page(high_memory) - mem_map;
	462	#endif
	463
1da177e4 LT	464	/* this will put all unused low memory onto the freelists */
	465	for_each_online_node(node) {
	466	pg_data_t *pgdat = NODE_DATA(node);
	467
a013053d RK	468	free_unused_memmap_node(node, &meminfo);
a013053d RK	469
1da177e4 LT	470	if (pgdat->node_spanned_pages != 0)
	471	totalram_pages += free_all_bootmem_node(pgdat);
	472	}
	473
	474	#ifdef CONFIG_SA1111
	475	/* now that our DMA memory is actually so designated, we can free it */
	476	free_area(PAGE_OFFSET, (unsigned long)swapper_pg_dir, NULL);
	477	#endif
	478
	479	/*
	480	* Since our memory may not be contiguous, calculate the
	481	* real number of pages we have in this system
	482	*/
	483	printk(KERN_INFO "Memory:");
	484
	485	num_physpages = 0;
	486	for (i = 0; i < meminfo.nr_banks; i++) {
d2a38ef9 RK	487	num_physpages += bank_pfn_size(&meminfo.bank[i]);
d2a38ef9 RK	488	printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
1da177e4 LT	489	}
	490
	491	printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
	492	printk(KERN_NOTICE "Memory: %luKB available (%dK code, "
	493	"%dK data, %dK init)\n",
	494	(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
	495	codepages >> 10, datapages >> 10, initpages >> 10);
	496
	497	if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
	498	extern int sysctl_overcommit_memory;
	499	/*
	500	* On a machine this small we won't get
	501	* anywhere without overcommit, so turn
	502	* it on by default.
	503	*/
	504	sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
	505	}
	506	}
	507
	508	void free_initmem(void)
	509	{
	510	if (!machine_is_integrator() && !machine_is_cintegrator()) {
	511	free_area((unsigned long)(&__init_begin),
	512	(unsigned long)(&__init_end),
	513	"init");
	514	}
	515	}
	516
	517	#ifdef CONFIG_BLK_DEV_INITRD
	518
	519	static int keep_initrd;
	520
	521	void free_initrd_mem(unsigned long start, unsigned long end)
	522	{
	523	if (!keep_initrd)
	524	free_area(start, end, "initrd");
	525	}
	526
	527	static int __init keepinitrd_setup(char *__unused)
	528	{
	529	keep_initrd = 1;
	530	return 1;
	531	}
	532
	533	__setup("keepinitrd", keepinitrd_setup);
	534	#endif