[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);

	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 int free_area(unsigned long pfn, unsigned long end, char *s)
{
	unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);

	for (; pfn < end; pfn++) {
		struct page *page = pfn_to_page(pfn);
		ClearPageReserved(page);
		init_page_count(page);
		__free_page(page);
		pages++;
	}

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

	return pages;
}

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;

	/* this will put all unused low memory onto the freelists */
	free_unused_memmap(&meminfo);

	totalram_pages += 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)
{
	totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
				    __phys_to_pfn(__pa(__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)
		totalram_pages += free_area(__phys_to_pfn(__pa(start)),
					    __phys_to_pfn(__pa(end)),
					    "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 G	68
	69	for_each_bank(i, mi) {
	70	struct membank *bank = &mi->bank[i];
	71	unsigned int pfn1, pfn2;
	72	struct page page, end;
	73
	74	pfn1 = bank_pfn_start(bank);
	75	pfn2 = bank_pfn_end(bank);
	76
	77	page = pfn_to_page(pfn1);
	78	end = pfn_to_page(pfn2 - 1) + 1;
	79
	80	do {
	81	total++;
	82	if (PageReserved(page))
	83	reserved++;
	84	else if (PageSwapCache(page))
	85	cached++;
	86	else if (PageSlab(page))
	87	slab++;
	88	else if (!page_count(page))
	89	free++;
	90	else
	91	shared += page_count(page) - 1;
	92	page++;
	93	} while (page < end);
	94	}
	95
	96	printk(KERN_DEFAULT "%d pages of RAM\n", total);
	97	printk(KERN_DEFAULT "%d free pages\n", free);
	98	printk(KERN_DEFAULT "%d reserved pages\n", reserved);
	99	printk(KERN_DEFAULT "%d slab pages\n", slab);
	100	printk(KERN_DEFAULT "%d pages shared\n", shared);
	101	printk(KERN_DEFAULT "%d pages swap cached\n", cached);
	102	}
	103
	104	static void __init find_limits(unsigned long min, unsigned long max_low,
	105	unsigned long *max_high)
	106	{
	107	struct meminfo *mi = &meminfo;
	108	int i;
	109
	110	*min = -1UL;
	111	max_low = max_high = 0;
	112
	113	for_each_bank(i, mi) {
	114	struct membank *bank = &mi->bank[i];
	115	unsigned long start, end;
	116
	117	start = bank_pfn_start(bank);
	118	end = bank_pfn_end(bank);
	119
	120	if (*min > start)
	121	*min = start;
	122	if (*max_high < end)
	123	*max_high = end;
	124	if (bank->highmem)
	125	continue;
	126	if (*max_low < end)
	127	*max_low = end;
	128	}
	129	}
	130
	131	static void __init uc32_bootmem_init(unsigned long start_pfn,
132	unsigned long end_pfn)
133	{
134	struct memblock_region *reg;
135	unsigned int boot_pages;
136	phys_addr_t bitmap;
137	pg_data_t *pgdat;
138
139	/*
140	* Allocate the bootmem bitmap page. This must be in a region
141	* of memory which has already been mapped.
142	*/
143	boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
144	bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
145	__pfn_to_phys(end_pfn));
146
147	/*
148	* Initialise the bootmem allocator, handing the
149	* memory banks over to bootmem.
150	*/
151	node_set_online(0);
152	pgdat = NODE_DATA(0);
153	init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
154
155	/* Free the lowmem regions from memblock into bootmem. */
156	for_each_memblock(memory, reg) {
157	unsigned long start = memblock_region_memory_base_pfn(reg);
158	unsigned long end = memblock_region_memory_end_pfn(reg);
159
160	if (end >= end_pfn)
161	end = end_pfn;
162	if (start >= end)
163	break;
164
165	free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
166	}
167
168	/* Reserve the lowmem memblock reserved regions in bootmem. */
169	for_each_memblock(reserved, reg) {
170	unsigned long start = memblock_region_reserved_base_pfn(reg);
171	unsigned long end = memblock_region_reserved_end_pfn(reg);
172
173	if (end >= end_pfn)
174	end = end_pfn;
175	if (start >= end)
176	break;
177
178	reserve_bootmem(__pfn_to_phys(start),
179	(end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
180	}
181	}
182
183	static void __init uc32_bootmem_free(unsigned long min, unsigned long max_low,
184	unsigned long max_high)
185	{
186	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
187	struct memblock_region *reg;
188
189	/*
190	* initialise the zones.
191	*/
192	memset(zone_size, 0, sizeof(zone_size));
193
194	/*
195	* The memory size has already been determined. If we need
196	* to do anything fancy with the allocation of this memory
197	* to the zones, now is the time to do it.
198	*/
199	zone_size[0] = max_low - min;
200
201	/*
202	* Calculate the size of the holes.
203	* holes = node_size - sum(bank_sizes)
204	*/
205	memcpy(zhole_size, zone_size, sizeof(zhole_size));
206	for_each_memblock(memory, reg) {
207	unsigned long start = memblock_region_memory_base_pfn(reg);
208	unsigned long end = memblock_region_memory_end_pfn(reg);
209
210	if (start < max_low) {
211	unsigned long low_end = min(end, max_low);
212	zhole_size[0] -= low_end - start;
213	}
214	}
215
216	/*
217	* Adjust the sizes according to any special requirements for
218	* this machine type.
219	*/
220	arch_adjust_zones(zone_size, zhole_size);
221
222	free_area_init_node(0, zone_size, min, zhole_size);
223	}
224
225	int pfn_valid(unsigned long pfn)
226	{
227	return memblock_is_memory(pfn << PAGE_SHIFT);
228	}
229	EXPORT_SYMBOL(pfn_valid);
230
231	static void uc32_memory_present(void)
232	{
233	}
234
235	static int __init meminfo_cmp(const void _a, const void _b)
236	{
237	const struct membank a = _a, b = _b;
238	long cmp = bank_pfn_start(a) - bank_pfn_start(b);
239	return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
240	}
241
242	void __init uc32_memblock_init(struct meminfo *mi)
243	{
244	int i;
245
246	sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]),
247	meminfo_cmp, NULL);
248
b50f1704 G	249	for (i = 0; i < mi->nr_banks; i++)
	250	memblock_add(mi->bank[i].start, mi->bank[i].size);
	251
	252	/* Register the kernel text, kernel data and initrd with memblock. */
	253	memblock_reserve(__pa(_text), _end - _text);
	254
	255	#ifdef CONFIG_BLK_DEV_INITRD
	256	if (phys_initrd_size) {
	257	memblock_reserve(phys_initrd_start, phys_initrd_size);
	258
	259	/* Now convert initrd to virtual addresses */
	260	initrd_start = __phys_to_virt(phys_initrd_start);
	261	initrd_end = initrd_start + phys_initrd_size;
	262	}
	263	#endif
	264
	265	uc32_mm_memblock_reserve();
	266
1aadc056	267	memblock_allow_resize();
b50f1704 G	268	memblock_dump_all();
	269	}
	270
	271	void __init bootmem_init(void)
	272	{
	273	unsigned long min, max_low, max_high;
	274
	275	max_low = max_high = 0;
	276
	277	find_limits(&min, &max_low, &max_high);
	278
	279	uc32_bootmem_init(min, max_low);
	280
	281	#ifdef CONFIG_SWIOTLB
	282	swiotlb_init(1);
	283	#endif
	284	/*
	285	* Sparsemem tries to allocate bootmem in memory_present(),
	286	* so must be done after the fixed reservations
	287	*/
	288	uc32_memory_present();
	289
	290	/*
	291	* sparse_init() needs the bootmem allocator up and running.
	292	*/
	293	sparse_init();
	294
	295	/*
	296	* Now free the memory - free_area_init_node needs
	297	* the sparse mem_map arrays initialized by sparse_init()
	298	* for memmap_init_zone(), otherwise all PFNs are invalid.
	299	*/
	300	uc32_bootmem_free(min, max_low, max_high);
	301
	302	high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
	303
	304	/*
	305	* This doesn't seem to be used by the Linux memory manager any
	306	* more, but is used by ll_rw_block. If we can get rid of it, we
	307	* also get rid of some of the stuff above as well.
	308	*
	309	* Note: max_low_pfn and max_pfn reflect the number of _pages_ in
	310	* the system, not the maximum PFN.
	311	*/
	312	max_low_pfn = max_low - PHYS_PFN_OFFSET;
	313	max_pfn = max_high - PHYS_PFN_OFFSET;
	314	}
	315
	316	static inline int free_area(unsigned long pfn, unsigned long end, char *s)
	317	{
	318	unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
	319
	320	for (; pfn < end; pfn++) {
	321	struct page *page = pfn_to_page(pfn);
	322	ClearPageReserved(page);
	323	init_page_count(page);
	324	__free_page(page);
	325	pages++;
	326	}
	327
	328	if (size && s)
	329	printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
	330
	331	return pages;
332	}
333
334	static inline void
335	free_memmap(unsigned long start_pfn, unsigned long end_pfn)
336	{
337	struct page start_pg, end_pg;
338	unsigned long pg, pgend;
339
340	/*
341	* Convert start_pfn/end_pfn to a struct page pointer.
342	*/
343	start_pg = pfn_to_page(start_pfn - 1) + 1;
344	end_pg = pfn_to_page(end_pfn);
345
346	/*
347	* Convert to physical addresses, and
348	* round start upwards and end downwards.
349	*/
350	pg = PAGE_ALIGN(__pa(start_pg));
351	pgend = __pa(end_pg) & PAGE_MASK;
352
353	/*
354	* If there are free pages between these,
355	* free the section of the memmap array.
356	*/
357	if (pg < pgend)
358	free_bootmem(pg, pgend - pg);
359	}
360
361	/*
362	* The mem_map array can get very big. Free the unused area of the memory map.
363	*/
364	static void __init free_unused_memmap(struct meminfo *mi)
365	{
366	unsigned long bank_start, prev_bank_end = 0;
367	unsigned int i;
368
369	/*
370	* This relies on each bank being in address order.
371	* The banks are sorted previously in bootmem_init().
372	*/
373	for_each_bank(i, mi) {
374	struct membank *bank = &mi->bank[i];
375
376	bank_start = bank_pfn_start(bank);
377
378	/*
379	* If we had a previous bank, and there is a space
380	* between the current bank and the previous, free it.
381	*/
382	if (prev_bank_end && prev_bank_end < bank_start)
383	free_memmap(prev_bank_end, bank_start);
384
385	/*
386	* Align up here since the VM subsystem insists that the
387	* memmap entries are valid from the bank end aligned to
388	* MAX_ORDER_NR_PAGES.
389	*/
390	prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
391	}
392	}
393
394	/*
395	* mem_init() marks the free areas in the mem_map and tells us how much
396	* memory is free. This is done after various parts of the system have
397	* claimed their memory after the kernel image.
398	*/
399	void __init mem_init(void)
400	{
401	unsigned long reserved_pages, free_pages;
402	struct memblock_region *reg;
403	int i;
404
405	max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
406
407	/* this will put all unused low memory onto the freelists */
408	free_unused_memmap(&meminfo);
409
410	totalram_pages += free_all_bootmem();
411
412	reserved_pages = free_pages = 0;
413
414	for_each_bank(i, &meminfo) {
415	struct membank *bank = &meminfo.bank[i];
416	unsigned int pfn1, pfn2;
417	struct page page, end;
418
419	pfn1 = bank_pfn_start(bank);
420	pfn2 = bank_pfn_end(bank);
421
422	page = pfn_to_page(pfn1);
423	end = pfn_to_page(pfn2 - 1) + 1;
424
425	do {
426	if (PageReserved(page))
427	reserved_pages++;
428	else if (!page_count(page))
429	free_pages++;
430	page++;
431	} while (page < end);
432	}
433
434	/*
435	* Since our memory may not be contiguous, calculate the
436	* real number of pages we have in this system
437	*/
438	printk(KERN_INFO "Memory:");
439	num_physpages = 0;
440	for_each_memblock(memory, reg) {
441	unsigned long pages = memblock_region_memory_end_pfn(reg) -
442	memblock_region_memory_base_pfn(reg);
443	num_physpages += pages;
444	printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
445	}
446	printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
447
448	printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
449	nr_free_pages() << (PAGE_SHIFT-10),
450	free_pages << (PAGE_SHIFT-10),
451	reserved_pages << (PAGE_SHIFT-10),
452	totalhigh_pages << (PAGE_SHIFT-10));
453
454	printk(KERN_NOTICE "Virtual kernel memory layout:\n"
455	" vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
456	" vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
457	" lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
458	" modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
459	" .init : 0x%p" " - 0x%p" " (%4d kB)\n"
460	" .text : 0x%p" " - 0x%p" " (%4d kB)\n"
461	" .data : 0x%p" " - 0x%p" " (%4d kB)\n",
462
463	VECTORS_BASE, VECTORS_BASE + PAGE_SIZE,
464	DIV_ROUND_UP(PAGE_SIZE, SZ_1K),
465	VMALLOC_START, VMALLOC_END,
466	DIV_ROUND_UP((VMALLOC_END - VMALLOC_START), SZ_1M),
467	PAGE_OFFSET, (unsigned long)high_memory,
468	DIV_ROUND_UP(((unsigned long)high_memory - PAGE_OFFSET), SZ_1M),
469	MODULES_VADDR, MODULES_END,
470	DIV_ROUND_UP((MODULES_END - MODULES_VADDR), SZ_1M),
471
472	__init_begin, __init_end,
473	DIV_ROUND_UP((__init_end - __init_begin), SZ_1K),
474	_stext, _etext,
475	DIV_ROUND_UP((_etext - _stext), SZ_1K),
476	_sdata, _edata,
477	DIV_ROUND_UP((_edata - _sdata), SZ_1K));
478
479	BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
480	BUG_ON(TASK_SIZE > MODULES_VADDR);
481
482	if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
483	/*
484	* On a machine this small we won't get
485	* anywhere without overcommit, so turn
486	* it on by default.
487	*/
488	sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
489	}
490	}
491
492	void free_initmem(void)
493	{
494	totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
495	__phys_to_pfn(__pa(__init_end)),
496	"init");
497	}
498
499	#ifdef CONFIG_BLK_DEV_INITRD
500
501	static int keep_initrd;
502
503	void free_initrd_mem(unsigned long start, unsigned long end)
504	{
505	if (!keep_initrd)
506	totalram_pages += free_area(__phys_to_pfn(__pa(start)),
507	__phys_to_pfn(__pa(end)),
508	"initrd");
509	}
510
511	static int __init keepinitrd_setup(char *__unused)
512	{
513	keep_initrd = 1;
514	return 1;
515	}
516
517	__setup("keepinitrd", keepinitrd_setup);
518	#endif