[deliverable/linux.git] / arch / unicore32 / mm / init.c

/*
 *  linux/arch/unicore32/mm/init.c
 *
 *  Copyright (C) 2010 GUAN Xue-tao
 *
 * 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 <linux/highmem.h>
#include <linux/gfp.h>
#include <linux/memblock.h>
#include <linux/sort.h>
#include <linux/dma-mapping.h>
#include <linux/export.h>

#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/sizes.h>
#include <asm/tlb.h>
#include <asm/memblock.h>
#include <mach/map.h>

#include "mm.h"

static unsigned long phys_initrd_start __initdata = 0x01000000;
static unsigned long phys_initrd_size __initdata = SZ_8M;

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

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

		phys_initrd_start = start;
		phys_initrd_size = size;
	}
	return 0;
}
early_param("initrd", early_initrd);

/*
 * This keeps memory configuration data used by a couple memory
 * initialization functions, as well as show_mem() for the skipping
 * of holes in the memory map.  It is populated by uc32_add_memory().
 */
struct meminfo meminfo;

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

	printk(KERN_DEFAULT "Mem-info:\n");
	show_free_areas(filter);

	if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
		return;

	for_each_bank(i, mi) {
		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 = pfn_to_page(pfn1);
		end  = pfn_to_page(pfn2 - 1) + 1;

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

static void __init find_limits(unsigned long *min, unsigned long *max_low,
	unsigned long *max_high)
{
	struct meminfo *mi = &meminfo;
	int i;

	*min = -1UL;
	*max_low = *max_high = 0;

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

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

		if (*min > start)
			*min = start;
		if (*max_high < end)
			*max_high = end;
		if (bank->highmem)
			continue;
		if (*max_low < end)
			*max_low = end;
	}
}

static void __init uc32_bootmem_init(unsigned long start_pfn,
	unsigned long end_pfn)
{
	struct memblock_region *reg;
	unsigned int boot_pages;
	phys_addr_t bitmap;
	pg_data_t *pgdat;

	/*
	 * Allocate the bootmem bitmap page.  This must be in a region
	 * of memory which has already been mapped.
	 */
	boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
	bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
				__pfn_to_phys(end_pfn));

	/*
	 * Initialise the bootmem allocator, handing the
	 * memory banks over to bootmem.
	 */
	node_set_online(0);
	pgdat = NODE_DATA(0);
	init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);

	/* Free the lowmem regions from memblock into bootmem. */
	for_each_memblock(memory, reg) {
		unsigned long start = memblock_region_memory_base_pfn(reg);
		unsigned long end = memblock_region_memory_end_pfn(reg);

		if (end >= end_pfn)
			end = end_pfn;
		if (start >= end)
			break;

		free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
	}

	/* Reserve the lowmem memblock reserved regions in bootmem. */
	for_each_memblock(reserved, reg) {
		unsigned long start = memblock_region_reserved_base_pfn(reg);
		unsigned long end = memblock_region_reserved_end_pfn(reg);

		if (end >= end_pfn)
			end = end_pfn;
		if (start >= end)
			break;

		reserve_bootmem(__pfn_to_phys(start),
			(end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
	}
}

static void __init uc32_bootmem_free(unsigned long min, unsigned long max_low,
	unsigned long max_high)
{
	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
	struct memblock_region *reg;

	/*
	 * initialise the zones.
	 */
	memset(zone_size, 0, sizeof(zone_size));

	/*
	 * The memory size 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] = max_low - min;

	/*
	 * Calculate the size of the holes.
	 *  holes = node_size - sum(bank_sizes)
	 */
	memcpy(zhole_size, zone_size, sizeof(zhole_size));
	for_each_memblock(memory, reg) {
		unsigned long start = memblock_region_memory_base_pfn(reg);
		unsigned long end = memblock_region_memory_end_pfn(reg);

		if (start < max_low) {
			unsigned long low_end = min(end, max_low);
			zhole_size[0] -= low_end - start;
		}
	}

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

	free_area_init_node(0, zone_size, min, zhole_size);
}

int pfn_valid(unsigned long pfn)
{
	return memblock_is_memory(pfn << PAGE_SHIFT);
}
EXPORT_SYMBOL(pfn_valid);

static void uc32_memory_present(void)
{
}

static int __init meminfo_cmp(const void *_a, const void *_b)
{
	const struct membank *a = _a, *b = _b;
	long cmp = bank_pfn_start(a) - bank_pfn_start(b);
	return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
}

void __init uc32_memblock_init(struct meminfo *mi)
{
	int i;

	sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]),
		meminfo_cmp, NULL);

	for (i = 0; i < mi->nr_banks; i++)
		memblock_add(mi->bank[i].start, mi->bank[i].size);

	/* Register the kernel text, kernel data and initrd with memblock. */
	memblock_reserve(__pa(_text), _end - _text);

#ifdef CONFIG_BLK_DEV_INITRD
	if (phys_initrd_size) {
		memblock_reserve(phys_initrd_start, phys_initrd_size);

		/* Now convert initrd to virtual addresses */
		initrd_start = __phys_to_virt(phys_initrd_start);
		initrd_end = initrd_start + phys_initrd_size;
	}
#endif

	uc32_mm_memblock_reserve();

	memblock_allow_resize();
	memblock_dump_all();
}

void __init bootmem_init(void)
{
	unsigned long min, max_low, max_high;

	max_low = max_high = 0;

	find_limits(&min, &max_low, &max_high);

	uc32_bootmem_init(min, max_low);

#ifdef CONFIG_SWIOTLB
	swiotlb_init(1);
#endif
	/*
	 * Sparsemem tries to allocate bootmem in memory_present(),
	 * so must be done after the fixed reservations
	 */
	uc32_memory_present();

	/*
	 * sparse_init() needs the bootmem allocator up and running.
	 */
	sparse_init();

	/*
	 * Now free the memory - free_area_init_node needs
	 * the sparse mem_map arrays initialized by sparse_init()
	 * for memmap_init_zone(), otherwise all PFNs are invalid.
	 */
	uc32_bootmem_free(min, max_low, max_high);

	high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;

	/*
	 * 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_low_pfn = max_low - PHYS_PFN_OFFSET;
	max_pfn = max_high - PHYS_PFN_OFFSET;
}

static inline void
free_memmap(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 - 1) + 1;
	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(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(struct meminfo *mi)
{
	unsigned long bank_start, prev_bank_end = 0;
	unsigned int i;

	/*
	 * This relies on each bank being in address order.
	 * The banks are sorted previously in bootmem_init().
	 */
	for_each_bank(i, mi) {
		struct membank *bank = &mi->bank[i];

		bank_start = bank_pfn_start(bank);

		/*
		 * 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(prev_bank_end, bank_start);

		/*
		 * Align up here since the VM subsystem insists that the
		 * memmap entries are valid from the bank end aligned to
		 * MAX_ORDER_NR_PAGES.
		 */
		prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
	}
}

/*
 * 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 long reserved_pages, free_pages;
	struct memblock_region *reg;
	int i;

	max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;

	free_unused_memmap(&meminfo);

	/* this will put all unused low memory onto the freelists */
	free_all_bootmem();

	reserved_pages = free_pages = 0;

	for_each_bank(i, &meminfo) {
		struct membank *bank = &meminfo.bank[i];
		unsigned int pfn1, pfn2;
		struct page *page, *end;

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

		page = pfn_to_page(pfn1);
		end  = pfn_to_page(pfn2 - 1) + 1;

		do {
			if (PageReserved(page))
				reserved_pages++;
			else if (!page_count(page))
				free_pages++;
			page++;
		} while (page < end);
	}

	/*
	 * 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_each_memblock(memory, reg) {
		unsigned long pages = memblock_region_memory_end_pfn(reg) -
			memblock_region_memory_base_pfn(reg);
		num_physpages += pages;
		printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
	}
	printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));

	printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
		nr_free_pages() << (PAGE_SHIFT-10),
		free_pages << (PAGE_SHIFT-10),
		reserved_pages << (PAGE_SHIFT-10),
		totalhigh_pages << (PAGE_SHIFT-10));

	printk(KERN_NOTICE "Virtual kernel memory layout:\n"
		"    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
		"    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
		"    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
		"    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
		"      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
		"      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
		"      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",

		VECTORS_BASE, VECTORS_BASE + PAGE_SIZE,
		DIV_ROUND_UP(PAGE_SIZE, SZ_1K),
		VMALLOC_START, VMALLOC_END,
		DIV_ROUND_UP((VMALLOC_END - VMALLOC_START), SZ_1M),
		PAGE_OFFSET, (unsigned long)high_memory,
		DIV_ROUND_UP(((unsigned long)high_memory - PAGE_OFFSET), SZ_1M),
		MODULES_VADDR, MODULES_END,
		DIV_ROUND_UP((MODULES_END - MODULES_VADDR), SZ_1M),

		__init_begin, __init_end,
		DIV_ROUND_UP((__init_end - __init_begin), SZ_1K),
		_stext, _etext,
		DIV_ROUND_UP((_etext - _stext), SZ_1K),
		_sdata, _edata,
		DIV_ROUND_UP((_edata - _sdata), SZ_1K));

	BUILD_BUG_ON(TASK_SIZE				> MODULES_VADDR);
	BUG_ON(TASK_SIZE				> MODULES_VADDR);

	if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
		/*
		 * 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)
{
	free_initmem_default(-1);
}

#ifdef CONFIG_BLK_DEV_INITRD

static int keep_initrd;

void free_initrd_mem(unsigned long start, unsigned long end)
{
	if (!keep_initrd)
		free_reserved_area((void *)start, (void *)end, -1, "initrd");
}

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

__setup("keepinitrd", keepinitrd_setup);
#endif
Commit	Line	Data
b50f1704 G	1	/*
	2	* linux/arch/unicore32/mm/init.c
	3	*
	4	* Copyright (C) 2010 GUAN Xue-tao
	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	#include <linux/dma-mapping.h>
5270f312	23	#include <linux/export.h>
b50f1704 G	24
	25	#include <asm/sections.h>
	26	#include <asm/setup.h>
	27	#include <asm/sizes.h>
	28	#include <asm/tlb.h>
1c16d242	29	#include <asm/memblock.h>
b50f1704 G	30	#include <mach/map.h>
	31
	32	#include "mm.h"
	33
	34	static unsigned long phys_initrd_start __initdata = 0x01000000;
	35	static unsigned long phys_initrd_size __initdata = SZ_8M;
	36
	37	static int __init early_initrd(char *p)
	38	{
	39	unsigned long start, size;
	40	char *endp;
	41
	42	start = memparse(p, &endp);
	43	if (*endp == ',') {
	44	size = memparse(endp + 1, NULL);
	45
	46	phys_initrd_start = start;
	47	phys_initrd_size = size;
	48	}
	49	return 0;
	50	}
	51	early_param("initrd", early_initrd);
	52
	53	/*
	54	* This keeps memory configuration data used by a couple memory
	55	* initialization functions, as well as show_mem() for the skipping
	56	* of holes in the memory map. It is populated by uc32_add_memory().
	57	*/
	58	struct meminfo meminfo;
	59
b2b755b5	60	void show_mem(unsigned int filter)
b50f1704 G	61	{
	62	int free = 0, total = 0, reserved = 0;
	63	int shared = 0, cached = 0, slab = 0, i;
	64	struct meminfo *mi = &meminfo;
	65
	66	printk(KERN_DEFAULT "Mem-info:\n");
7bf02ea2	67	show_free_areas(filter);
b50f1704	68
4b59e6c4 DR	69	if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
	70	return;
	71
b50f1704 G	72	for_each_bank(i, mi) {
	73	struct membank *bank = &mi->bank[i];
	74	unsigned int pfn1, pfn2;
	75	struct page page, end;
	76
	77	pfn1 = bank_pfn_start(bank);
	78	pfn2 = bank_pfn_end(bank);
	79
	80	page = pfn_to_page(pfn1);
	81	end = pfn_to_page(pfn2 - 1) + 1;
	82
	83	do {
	84	total++;
	85	if (PageReserved(page))
	86	reserved++;
	87	else if (PageSwapCache(page))
	88	cached++;
	89	else if (PageSlab(page))
	90	slab++;
	91	else if (!page_count(page))
	92	free++;
	93	else
	94	shared += page_count(page) - 1;
	95	page++;
	96	} while (page < end);
	97	}
	98
	99	printk(KERN_DEFAULT "%d pages of RAM\n", total);
	100	printk(KERN_DEFAULT "%d free pages\n", free);
	101	printk(KERN_DEFAULT "%d reserved pages\n", reserved);
	102	printk(KERN_DEFAULT "%d slab pages\n", slab);
	103	printk(KERN_DEFAULT "%d pages shared\n", shared);
	104	printk(KERN_DEFAULT "%d pages swap cached\n", cached);
	105	}
	106
	107	static void __init find_limits(unsigned long min, unsigned long max_low,
	108	unsigned long *max_high)
	109	{
	110	struct meminfo *mi = &meminfo;
	111	int i;
	112
	113	*min = -1UL;
	114	max_low = max_high = 0;
	115
	116	for_each_bank(i, mi) {
	117	struct membank *bank = &mi->bank[i];
	118	unsigned long start, end;
	119
	120	start = bank_pfn_start(bank);
	121	end = bank_pfn_end(bank);
	122
	123	if (*min > start)
	124	*min = start;
	125	if (*max_high < end)
	126	*max_high = end;
	127	if (bank->highmem)
	128	continue;
	129	if (*max_low < end)
	130	*max_low = end;
	131	}
	132	}
	133
	134	static void __init uc32_bootmem_init(unsigned long start_pfn,
	135	unsigned long end_pfn)
136	{
137	struct memblock_region *reg;
138	unsigned int boot_pages;
139	phys_addr_t bitmap;
140	pg_data_t *pgdat;
141
142	/*
143	* Allocate the bootmem bitmap page. This must be in a region
144	* of memory which has already been mapped.
145	*/
146	boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
147	bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
148	__pfn_to_phys(end_pfn));
149
150	/*
151	* Initialise the bootmem allocator, handing the
152	* memory banks over to bootmem.
153	*/
154	node_set_online(0);
155	pgdat = NODE_DATA(0);
156	init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
157
158	/* Free the lowmem regions from memblock into bootmem. */
159	for_each_memblock(memory, reg) {
160	unsigned long start = memblock_region_memory_base_pfn(reg);
161	unsigned long end = memblock_region_memory_end_pfn(reg);
162
163	if (end >= end_pfn)
164	end = end_pfn;
165	if (start >= end)
166	break;
167
168	free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
169	}
170
171	/* Reserve the lowmem memblock reserved regions in bootmem. */
172	for_each_memblock(reserved, reg) {
173	unsigned long start = memblock_region_reserved_base_pfn(reg);
174	unsigned long end = memblock_region_reserved_end_pfn(reg);
175
176	if (end >= end_pfn)
177	end = end_pfn;
178	if (start >= end)
179	break;
180
181	reserve_bootmem(__pfn_to_phys(start),
182	(end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
183	}
184	}
185
186	static void __init uc32_bootmem_free(unsigned long min, unsigned long max_low,
187	unsigned long max_high)
188	{
189	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
190	struct memblock_region *reg;
191
192	/*
193	* initialise the zones.
194	*/
195	memset(zone_size, 0, sizeof(zone_size));
196
197	/*
198	* The memory size has already been determined. If we need
199	* to do anything fancy with the allocation of this memory
200	* to the zones, now is the time to do it.
201	*/
202	zone_size[0] = max_low - min;
203
204	/*
205	* Calculate the size of the holes.
206	* holes = node_size - sum(bank_sizes)
207	*/
208	memcpy(zhole_size, zone_size, sizeof(zhole_size));
209	for_each_memblock(memory, reg) {
210	unsigned long start = memblock_region_memory_base_pfn(reg);
211	unsigned long end = memblock_region_memory_end_pfn(reg);
212
213	if (start < max_low) {
214	unsigned long low_end = min(end, max_low);
215	zhole_size[0] -= low_end - start;
216	}
217	}
218
219	/*
220	* Adjust the sizes according to any special requirements for
221	* this machine type.
222	*/
223	arch_adjust_zones(zone_size, zhole_size);
224
225	free_area_init_node(0, zone_size, min, zhole_size);
226	}
227
228	int pfn_valid(unsigned long pfn)
229	{
230	return memblock_is_memory(pfn << PAGE_SHIFT);
231	}
232	EXPORT_SYMBOL(pfn_valid);
233
234	static void uc32_memory_present(void)
235	{
236	}
237
238	static int __init meminfo_cmp(const void _a, const void _b)
239	{
240	const struct membank a = _a, b = _b;
241	long cmp = bank_pfn_start(a) - bank_pfn_start(b);
242	return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
243	}
244
245	void __init uc32_memblock_init(struct meminfo *mi)
246	{
247	int i;
248
249	sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]),
250	meminfo_cmp, NULL);
251
b50f1704 G	252	for (i = 0; i < mi->nr_banks; i++)
	253	memblock_add(mi->bank[i].start, mi->bank[i].size);
	254
	255	/* Register the kernel text, kernel data and initrd with memblock. */
	256	memblock_reserve(__pa(_text), _end - _text);
	257
	258	#ifdef CONFIG_BLK_DEV_INITRD
	259	if (phys_initrd_size) {
	260	memblock_reserve(phys_initrd_start, phys_initrd_size);
	261
	262	/* Now convert initrd to virtual addresses */
	263	initrd_start = __phys_to_virt(phys_initrd_start);
	264	initrd_end = initrd_start + phys_initrd_size;
	265	}
	266	#endif
	267
	268	uc32_mm_memblock_reserve();
	269
1aadc056	270	memblock_allow_resize();
b50f1704 G	271	memblock_dump_all();
	272	}
	273
	274	void __init bootmem_init(void)
	275	{
	276	unsigned long min, max_low, max_high;
	277
	278	max_low = max_high = 0;
	279
	280	find_limits(&min, &max_low, &max_high);
	281
	282	uc32_bootmem_init(min, max_low);
	283
	284	#ifdef CONFIG_SWIOTLB
	285	swiotlb_init(1);
	286	#endif
	287	/*
	288	* Sparsemem tries to allocate bootmem in memory_present(),
	289	* so must be done after the fixed reservations
	290	*/
	291	uc32_memory_present();
	292
	293	/*
	294	* sparse_init() needs the bootmem allocator up and running.
	295	*/
	296	sparse_init();
	297
	298	/*
	299	* Now free the memory - free_area_init_node needs
	300	* the sparse mem_map arrays initialized by sparse_init()
	301	* for memmap_init_zone(), otherwise all PFNs are invalid.
	302	*/
	303	uc32_bootmem_free(min, max_low, max_high);
	304
	305	high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
	306
	307	/*
	308	* This doesn't seem to be used by the Linux memory manager any
	309	* more, but is used by ll_rw_block. If we can get rid of it, we
	310	* also get rid of some of the stuff above as well.
	311	*
	312	* Note: max_low_pfn and max_pfn reflect the number of _pages_ in
	313	* the system, not the maximum PFN.
	314	*/
	315	max_low_pfn = max_low - PHYS_PFN_OFFSET;
	316	max_pfn = max_high - PHYS_PFN_OFFSET;
	317	}
	318
b50f1704 G	319	static inline void
	320	free_memmap(unsigned long start_pfn, unsigned long end_pfn)
	321	{
	322	struct page start_pg, end_pg;
	323	unsigned long pg, pgend;
	324
	325	/*
	326	* Convert start_pfn/end_pfn to a struct page pointer.
	327	*/
	328	start_pg = pfn_to_page(start_pfn - 1) + 1;
	329	end_pg = pfn_to_page(end_pfn);
	330
	331	/*
	332	* Convert to physical addresses, and
	333	* round start upwards and end downwards.
	334	*/
	335	pg = PAGE_ALIGN(__pa(start_pg));
	336	pgend = __pa(end_pg) & PAGE_MASK;
	337
	338	/*
	339	* If there are free pages between these,
	340	* free the section of the memmap array.
	341	*/
	342	if (pg < pgend)
	343	free_bootmem(pg, pgend - pg);
	344	}
	345
	346	/*
	347	* The mem_map array can get very big. Free the unused area of the memory map.
	348	*/
	349	static void __init free_unused_memmap(struct meminfo *mi)
	350	{
	351	unsigned long bank_start, prev_bank_end = 0;
	352	unsigned int i;
	353
	354	/*
	355	* This relies on each bank being in address order.
	356	* The banks are sorted previously in bootmem_init().
	357	*/
	358	for_each_bank(i, mi) {
	359	struct membank *bank = &mi->bank[i];
	360
	361	bank_start = bank_pfn_start(bank);
	362
	363	/*
	364	* If we had a previous bank, and there is a space
	365	* between the current bank and the previous, free it.
	366	*/
	367	if (prev_bank_end && prev_bank_end < bank_start)
	368	free_memmap(prev_bank_end, bank_start);
	369
	370	/*
	371	* Align up here since the VM subsystem insists that the
	372	* memmap entries are valid from the bank end aligned to
	373	* MAX_ORDER_NR_PAGES.
	374	*/
	375	prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
	376	}
	377	}
	378
	379	/*
	380	* mem_init() marks the free areas in the mem_map and tells us how much
	381	* memory is free. This is done after various parts of the system have
	382	* claimed their memory after the kernel image.
383	*/
384	void __init mem_init(void)
385	{
386	unsigned long reserved_pages, free_pages;
387	struct memblock_region *reg;
388	int i;
389
390	max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
391
b50f1704 G	392	free_unused_memmap(&meminfo);
b50f1704 G	393
ccecb510	394	/* this will put all unused low memory onto the freelists */
0c988534	395	free_all_bootmem();
b50f1704 G	396
	397	reserved_pages = free_pages = 0;
	398
	399	for_each_bank(i, &meminfo) {
	400	struct membank *bank = &meminfo.bank[i];
	401	unsigned int pfn1, pfn2;
	402	struct page page, end;
	403
	404	pfn1 = bank_pfn_start(bank);
	405	pfn2 = bank_pfn_end(bank);
	406
	407	page = pfn_to_page(pfn1);
	408	end = pfn_to_page(pfn2 - 1) + 1;
	409
	410	do {
	411	if (PageReserved(page))
	412	reserved_pages++;
	413	else if (!page_count(page))
	414	free_pages++;
	415	page++;
	416	} while (page < end);
	417	}
	418
	419	/*
	420	* Since our memory may not be contiguous, calculate the
	421	* real number of pages we have in this system
	422	*/
	423	printk(KERN_INFO "Memory:");
	424	num_physpages = 0;
	425	for_each_memblock(memory, reg) {
	426	unsigned long pages = memblock_region_memory_end_pfn(reg) -
	427	memblock_region_memory_base_pfn(reg);
	428	num_physpages += pages;
	429	printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
	430	}
	431	printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
	432
	433	printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
	434	nr_free_pages() << (PAGE_SHIFT-10),
	435	free_pages << (PAGE_SHIFT-10),
	436	reserved_pages << (PAGE_SHIFT-10),
	437	totalhigh_pages << (PAGE_SHIFT-10));
	438
	439	printk(KERN_NOTICE "Virtual kernel memory layout:\n"
	440	" vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
	441	" vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
	442	" lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
	443	" modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
	444	" .init : 0x%p" " - 0x%p" " (%4d kB)\n"
	445	" .text : 0x%p" " - 0x%p" " (%4d kB)\n"
	446	" .data : 0x%p" " - 0x%p" " (%4d kB)\n",
	447
	448	VECTORS_BASE, VECTORS_BASE + PAGE_SIZE,
	449	DIV_ROUND_UP(PAGE_SIZE, SZ_1K),
	450	VMALLOC_START, VMALLOC_END,
	451	DIV_ROUND_UP((VMALLOC_END - VMALLOC_START), SZ_1M),
	452	PAGE_OFFSET, (unsigned long)high_memory,
	453	DIV_ROUND_UP(((unsigned long)high_memory - PAGE_OFFSET), SZ_1M),
	454	MODULES_VADDR, MODULES_END,
	455	DIV_ROUND_UP((MODULES_END - MODULES_VADDR), SZ_1M),
	456
	457	__init_begin, __init_end,
	458	DIV_ROUND_UP((__init_end - __init_begin), SZ_1K),
	459	_stext, _etext,
460	DIV_ROUND_UP((_etext - _stext), SZ_1K),
461	_sdata, _edata,
462	DIV_ROUND_UP((_edata - _sdata), SZ_1K));
463
464	BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
465	BUG_ON(TASK_SIZE > MODULES_VADDR);
466
467	if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
468	/*
469	* On a machine this small we won't get
470	* anywhere without overcommit, so turn
471	* it on by default.
472	*/
473	sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
474	}
475	}
476
477	void free_initmem(void)
478	{
dbe67df4	479	free_initmem_default(-1);
b50f1704 G	480	}
	481
	482	#ifdef CONFIG_BLK_DEV_INITRD
	483
	484	static int keep_initrd;
	485
	486	void free_initrd_mem(unsigned long start, unsigned long end)
	487	{
	488	if (!keep_initrd)
dbe67df4	489	free_reserved_area((void )start, (void )end, -1, "initrd");
b50f1704 G	490	}
	491
	492	static int __init keepinitrd_setup(char *__unused)
	493	{
	494	keep_initrd = 1;
	495	return 1;
	496	}
	497
	498	__setup("keepinitrd", keepinitrd_setup);
	499	#endif