[linux-2.6-block.git] / arch / arm64 / mm / init.c

/*
 * Based on arch/arm/mm/init.c
 *
 * Copyright (C) 1995-2005 Russell King
 * Copyright (C) 2012 ARM Ltd.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/kernel.h>
#include <linux/export.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/gfp.h>
#include <linux/memblock.h>
#include <linux/sort.h>
#include <linux/of_fdt.h>

#include <asm/prom.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/sizes.h>
#include <asm/tlb.h>

#include "mm.h"

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

phys_addr_t memstart_addr __read_mostly = 0;

void __init early_init_dt_setup_initrd_arch(unsigned long start,
					    unsigned long end)
{
	phys_initrd_start = start;
	phys_initrd_size = end - start;
}

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);

#define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT)

static void __init zone_sizes_init(unsigned long min, unsigned long max)
{
	struct memblock_region *reg;
	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
	unsigned long max_dma32 = min;

	memset(zone_size, 0, sizeof(zone_size));

#ifdef CONFIG_ZONE_DMA32
	/* 4GB maximum for 32-bit only capable devices */
	max_dma32 = max(min, min(max, MAX_DMA32_PFN));
	zone_size[ZONE_DMA32] = max_dma32 - min;
#endif
	zone_size[ZONE_NORMAL] = max - max_dma32;

	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)
			continue;
#ifdef CONFIG_ZONE_DMA32
		if (start < max_dma32) {
			unsigned long dma_end = min(end, max_dma32);
			zhole_size[ZONE_DMA32] -= dma_end - start;
		}
#endif
		if (end > max_dma32) {
			unsigned long normal_end = min(end, max);
			unsigned long normal_start = max(start, max_dma32);
			zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
		}
	}

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

#ifdef CONFIG_HAVE_ARCH_PFN_VALID
int pfn_valid(unsigned long pfn)
{
	return memblock_is_memory(pfn << PAGE_SHIFT);
}
EXPORT_SYMBOL(pfn_valid);
#endif

#ifndef CONFIG_SPARSEMEM
static void arm64_memory_present(void)
{
}
#else
static void arm64_memory_present(void)
{
	struct memblock_region *reg;

	for_each_memblock(memory, reg)
		memory_present(0, memblock_region_memory_base_pfn(reg),
			       memblock_region_memory_end_pfn(reg));
}
#endif

void __init arm64_memblock_init(void)
{
	u64 *reserve_map, base, 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

	/*
	 * Reserve the page tables.  These are already in use,
	 * and can only be in node 0.
	 */
	memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE);
	memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE);

	/* Reserve the dtb region */
	memblock_reserve(virt_to_phys(initial_boot_params),
			 be32_to_cpu(initial_boot_params->totalsize));

	/*
	 * Process the reserve map.  This will probably overlap the initrd
	 * and dtb locations which are already reserved, but overlapping
	 * doesn't hurt anything
	 */
	reserve_map = ((void*)initial_boot_params) +
			be32_to_cpu(initial_boot_params->off_mem_rsvmap);
	while (1) {
		base = be64_to_cpup(reserve_map++);
		size = be64_to_cpup(reserve_map++);
		if (!size)
			break;
		memblock_reserve(base, size);
	}

	memblock_allow_resize();
	memblock_dump_all();
}

void __init bootmem_init(void)
{
	unsigned long min, max;

	min = PFN_UP(memblock_start_of_DRAM());
	max = PFN_DOWN(memblock_end_of_DRAM());

	/*
	 * Sparsemem tries to allocate bootmem in memory_present(), so must be
	 * done after the fixed reservations.
	 */
	arm64_memory_present();

	sparse_init();
	zone_sizes_init(min, max);

	high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
	max_pfn = max_low_pfn = max;
}

/*
 * Poison init memory with an undefined instruction (0x0).
 */
static inline void poison_init_mem(void *s, size_t count)
{
	memset(s, 0, count);
}

#ifndef CONFIG_SPARSEMEM_VMEMMAP
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 - 1) + 1;

	/*
	 * Convert to physical addresses, and round start upwards and end
	 * downwards.
	 */
	pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
	pgend = (unsigned long)__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(void)
{
	unsigned long start, prev_end = 0;
	struct memblock_region *reg;

	for_each_memblock(memory, reg) {
		start = __phys_to_pfn(reg->base);

#ifdef CONFIG_SPARSEMEM
		/*
		 * Take care not to free memmap entries that don't exist due
		 * to SPARSEMEM sections which aren't present.
		 */
		start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
#endif
		/*
		 * If we had a previous bank, and there is a space between the
		 * current bank and the previous, free it.
		 */
		if (prev_end && prev_end < start)
			free_memmap(prev_end, 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_end = ALIGN(start + __phys_to_pfn(reg->size),
				 MAX_ORDER_NR_PAGES);
	}

#ifdef CONFIG_SPARSEMEM
	if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
		free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
#endif
}
#endif	/* !CONFIG_SPARSEMEM_VMEMMAP */

/*
 * 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;

	arm64_swiotlb_init();

	max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;

#ifndef CONFIG_SPARSEMEM_VMEMMAP
	/* this will put all unused low memory onto the freelists */
	free_unused_memmap();
#endif

	totalram_pages += free_all_bootmem();

	reserved_pages = free_pages = 0;

	for_each_memblock(memory, reg) {
		unsigned int pfn1, pfn2;
		struct page *page, *end;

		pfn1 = __phys_to_pfn(reg->base);
		pfn2 = pfn1 + __phys_to_pfn(reg->size);

		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.
	 */
	pr_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));

	pr_notice("Memory: %luk/%luk available, %luk reserved\n",
		  nr_free_pages() << (PAGE_SHIFT-10),
		  free_pages << (PAGE_SHIFT-10),
		  reserved_pages << (PAGE_SHIFT-10));

#define MLK(b, t) b, t, ((t) - (b)) >> 10
#define MLM(b, t) b, t, ((t) - (b)) >> 20
#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)

	pr_notice("Virtual kernel memory layout:\n"
		  "    vmalloc : 0x%16lx - 0x%16lx   (%6ld MB)\n"
#ifdef CONFIG_SPARSEMEM_VMEMMAP
		  "    vmemmap : 0x%16lx - 0x%16lx   (%6ld MB)\n"
#endif
		  "    modules : 0x%16lx - 0x%16lx   (%6ld MB)\n"
		  "    memory  : 0x%16lx - 0x%16lx   (%6ld MB)\n"
		  "      .init : 0x%p" " - 0x%p" "   (%6ld kB)\n"
		  "      .text : 0x%p" " - 0x%p" "   (%6ld kB)\n"
		  "      .data : 0x%p" " - 0x%p" "   (%6ld kB)\n",
		  MLM(VMALLOC_START, VMALLOC_END),
#ifdef CONFIG_SPARSEMEM_VMEMMAP
		  MLM((unsigned long)virt_to_page(PAGE_OFFSET),
		      (unsigned long)virt_to_page(high_memory)),
#endif
		  MLM(MODULES_VADDR, MODULES_END),
		  MLM(PAGE_OFFSET, (unsigned long)high_memory),

		  MLK_ROUNDUP(__init_begin, __init_end),
		  MLK_ROUNDUP(_text, _etext),
		  MLK_ROUNDUP(_sdata, _edata));

#undef MLK
#undef MLM
#undef MLK_ROUNDUP

	/*
	 * Check boundaries twice: Some fundamental inconsistencies can be
	 * detected at build time already.
	 */
#ifdef CONFIG_COMPAT
	BUILD_BUG_ON(TASK_SIZE_32			> TASK_SIZE_64);
#endif
	BUILD_BUG_ON(TASK_SIZE_64			> MODULES_VADDR);
	BUG_ON(TASK_SIZE_64				> MODULES_VADDR);

	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)
{
	poison_init_mem(__init_begin, __init_end - __init_begin);
	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) {
		poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
		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
c1cc1552 CM	1	/*
	2	* Based on arch/arm/mm/init.c
	3	*
	4	* Copyright (C) 1995-2005 Russell King
	5	* Copyright (C) 2012 ARM Ltd.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include <linux/kernel.h>
	21	#include <linux/export.h>
	22	#include <linux/errno.h>
	23	#include <linux/swap.h>
	24	#include <linux/init.h>
	25	#include <linux/bootmem.h>
	26	#include <linux/mman.h>
	27	#include <linux/nodemask.h>
	28	#include <linux/initrd.h>
	29	#include <linux/gfp.h>
	30	#include <linux/memblock.h>
	31	#include <linux/sort.h>
	32	#include <linux/of_fdt.h>
	33
	34	#include <asm/prom.h>
	35	#include <asm/sections.h>
	36	#include <asm/setup.h>
	37	#include <asm/sizes.h>
	38	#include <asm/tlb.h>
	39
	40	#include "mm.h"
	41
	42	static unsigned long phys_initrd_start __initdata = 0;
	43	static unsigned long phys_initrd_size __initdata = 0;
	44
	45	phys_addr_t memstart_addr __read_mostly = 0;
	46
	47	void __init early_init_dt_setup_initrd_arch(unsigned long start,
	48	unsigned long end)
	49	{
	50	phys_initrd_start = start;
	51	phys_initrd_size = end - start;
	52	}
	53
	54	static int __init early_initrd(char *p)
	55	{
	56	unsigned long start, size;
	57	char *endp;
	58
	59	start = memparse(p, &endp);
	60	if (*endp == ',') {
	61	size = memparse(endp + 1, NULL);
	62
	63	phys_initrd_start = start;
	64	phys_initrd_size = size;
65	}
66	return 0;
67	}
68	early_param("initrd", early_initrd);
69
70	#define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT)
71
72	static void __init zone_sizes_init(unsigned long min, unsigned long max)
73	{
74	struct memblock_region *reg;
75	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
76	unsigned long max_dma32 = min;
77
78	memset(zone_size, 0, sizeof(zone_size));
79
80	#ifdef CONFIG_ZONE_DMA32
81	/* 4GB maximum for 32-bit only capable devices */
938edf5c WD	82	max_dma32 = max(min, min(max, MAX_DMA32_PFN));
938edf5c WD	83	zone_size[ZONE_DMA32] = max_dma32 - min;
c1cc1552 CM	84	#endif
	85	zone_size[ZONE_NORMAL] = max - max_dma32;
	86
	87	memcpy(zhole_size, zone_size, sizeof(zhole_size));
	88
	89	for_each_memblock(memory, reg) {
	90	unsigned long start = memblock_region_memory_base_pfn(reg);
	91	unsigned long end = memblock_region_memory_end_pfn(reg);
	92
	93	if (start >= max)
	94	continue;
	95	#ifdef CONFIG_ZONE_DMA32
	96	if (start < max_dma32) {
	97	unsigned long dma_end = min(end, max_dma32);
	98	zhole_size[ZONE_DMA32] -= dma_end - start;
	99	}
	100	#endif
	101	if (end > max_dma32) {
	102	unsigned long normal_end = min(end, max);
	103	unsigned long normal_start = max(start, max_dma32);
	104	zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
	105	}
	106	}
	107
	108	free_area_init_node(0, zone_size, min, zhole_size);
	109	}
	110
	111	#ifdef CONFIG_HAVE_ARCH_PFN_VALID
	112	int pfn_valid(unsigned long pfn)
	113	{
	114	return memblock_is_memory(pfn << PAGE_SHIFT);
	115	}
	116	EXPORT_SYMBOL(pfn_valid);
	117	#endif
	118
	119	#ifndef CONFIG_SPARSEMEM
	120	static void arm64_memory_present(void)
	121	{
	122	}
	123	#else
	124	static void arm64_memory_present(void)
	125	{
	126	struct memblock_region *reg;
	127
	128	for_each_memblock(memory, reg)
	129	memory_present(0, memblock_region_memory_base_pfn(reg),
	130	memblock_region_memory_end_pfn(reg));
	131	}
	132	#endif
	133
	134	void __init arm64_memblock_init(void)
	135	{
	136	u64 *reserve_map, base, size;
	137
	138	/* Register the kernel text, kernel data and initrd with memblock */
	139	memblock_reserve(__pa(_text), _end - _text);
	140	#ifdef CONFIG_BLK_DEV_INITRD
	141	if (phys_initrd_size) {
	142	memblock_reserve(phys_initrd_start, phys_initrd_size);
	143
	144	/* Now convert initrd to virtual addresses */
	145	initrd_start = __phys_to_virt(phys_initrd_start);
	146	initrd_end = initrd_start + phys_initrd_size;
	147	}
148	#endif
149
150	/*
151	* Reserve the page tables. These are already in use,
152	* and can only be in node 0.
153	*/
154	memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE);
155	memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE);
156
157	/* Reserve the dtb region */
158	memblock_reserve(virt_to_phys(initial_boot_params),
159	be32_to_cpu(initial_boot_params->totalsize));
160
161	/*
162	* Process the reserve map. This will probably overlap the initrd
163	* and dtb locations which are already reserved, but overlapping
164	* doesn't hurt anything
165	*/
166	reserve_map = ((void*)initial_boot_params) +
167	be32_to_cpu(initial_boot_params->off_mem_rsvmap);
168	while (1) {
169	base = be64_to_cpup(reserve_map++);
170	size = be64_to_cpup(reserve_map++);
171	if (!size)
172	break;
173	memblock_reserve(base, size);
174	}
175
176	memblock_allow_resize();
177	memblock_dump_all();
178	}
179
180	void __init bootmem_init(void)
181	{
182	unsigned long min, max;
183
184	min = PFN_UP(memblock_start_of_DRAM());
185	max = PFN_DOWN(memblock_end_of_DRAM());
186
187	/*
188	* Sparsemem tries to allocate bootmem in memory_present(), so must be
189	* done after the fixed reservations.
190	*/
191	arm64_memory_present();
192
193	sparse_init();
194	zone_sizes_init(min, max);
195
196	high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
197	max_pfn = max_low_pfn = max;
198	}
199
c1cc1552 CM	200	/*
	201	* Poison init memory with an undefined instruction (0x0).
	202	*/
	203	static inline void poison_init_mem(void *s, size_t count)
	204	{
	205	memset(s, 0, count);
	206	}
	207
	208	#ifndef CONFIG_SPARSEMEM_VMEMMAP
	209	static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
	210	{
	211	struct page start_pg, end_pg;
	212	unsigned long pg, pgend;
	213
	214	/*
	215	* Convert start_pfn/end_pfn to a struct page pointer.
	216	*/
	217	start_pg = pfn_to_page(start_pfn - 1) + 1;
	218	end_pg = pfn_to_page(end_pfn - 1) + 1;
	219
	220	/*
	221	* Convert to physical addresses, and round start upwards and end
	222	* downwards.
	223	*/
	224	pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
	225	pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
	226
	227	/*
	228	* If there are free pages between these, free the section of the
	229	* memmap array.
	230	*/
	231	if (pg < pgend)
	232	free_bootmem(pg, pgend - pg);
	233	}
	234
	235	/*
	236	* The mem_map array can get very big. Free the unused area of the memory map.
	237	*/
	238	static void __init free_unused_memmap(void)
	239	{
	240	unsigned long start, prev_end = 0;
	241	struct memblock_region *reg;
	242
	243	for_each_memblock(memory, reg) {
	244	start = __phys_to_pfn(reg->base);
	245
	246	#ifdef CONFIG_SPARSEMEM
	247	/*
	248	* Take care not to free memmap entries that don't exist due
	249	* to SPARSEMEM sections which aren't present.
	250	*/
	251	start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
	252	#endif
	253	/*
	254	* If we had a previous bank, and there is a space between the
	255	* current bank and the previous, free it.
	256	*/
	257	if (prev_end && prev_end < start)
	258	free_memmap(prev_end, start);
	259
	260	/*
	261	* Align up here since the VM subsystem insists that the
	262	* memmap entries are valid from the bank end aligned to
	263	* MAX_ORDER_NR_PAGES.
264	*/
265	prev_end = ALIGN(start + __phys_to_pfn(reg->size),
266	MAX_ORDER_NR_PAGES);
267	}
268
269	#ifdef CONFIG_SPARSEMEM
270	if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
271	free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
272	#endif
273	}
274	#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
275
276	/*
277	* mem_init() marks the free areas in the mem_map and tells us how much memory
278	* is free. This is done after various parts of the system have claimed their
279	* memory after the kernel image.
280	*/
281	void __init mem_init(void)
282	{
283	unsigned long reserved_pages, free_pages;
284	struct memblock_region *reg;
285
27222a3d	286	arm64_swiotlb_init();
c1cc1552 CM	287
	288	max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
	289
	290	#ifndef CONFIG_SPARSEMEM_VMEMMAP
	291	/* this will put all unused low memory onto the freelists */
	292	free_unused_memmap();
	293	#endif
	294
	295	totalram_pages += free_all_bootmem();
	296
	297	reserved_pages = free_pages = 0;
	298
	299	for_each_memblock(memory, reg) {
	300	unsigned int pfn1, pfn2;
	301	struct page page, end;
	302
	303	pfn1 = __phys_to_pfn(reg->base);
	304	pfn2 = pfn1 + __phys_to_pfn(reg->size);
	305
	306	page = pfn_to_page(pfn1);
	307	end = pfn_to_page(pfn2 - 1) + 1;
	308
	309	do {
	310	if (PageReserved(page))
	311	reserved_pages++;
	312	else if (!page_count(page))
	313	free_pages++;
	314	page++;
	315	} while (page < end);
	316	}
	317
	318	/*
	319	* Since our memory may not be contiguous, calculate the real number
	320	* of pages we have in this system.
	321	*/
	322	pr_info("Memory:");
	323	num_physpages = 0;
	324	for_each_memblock(memory, reg) {
	325	unsigned long pages = memblock_region_memory_end_pfn(reg) -
	326	memblock_region_memory_base_pfn(reg);
	327	num_physpages += pages;
	328	printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
	329	}
	330	printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
	331
	332	pr_notice("Memory: %luk/%luk available, %luk reserved\n",
	333	nr_free_pages() << (PAGE_SHIFT-10),
	334	free_pages << (PAGE_SHIFT-10),
	335	reserved_pages << (PAGE_SHIFT-10));
	336
	337	#define MLK(b, t) b, t, ((t) - (b)) >> 10
	338	#define MLM(b, t) b, t, ((t) - (b)) >> 20
	339	#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
	340
	341	pr_notice("Virtual kernel memory layout:\n"
	342	" vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n"
	343	#ifdef CONFIG_SPARSEMEM_VMEMMAP
	344	" vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n"
	345	#endif
	346	" modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
	347	" memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
	348	" .init : 0x%p" " - 0x%p" " (%6ld kB)\n"
	349	" .text : 0x%p" " - 0x%p" " (%6ld kB)\n"
	350	" .data : 0x%p" " - 0x%p" " (%6ld kB)\n",
351	MLM(VMALLOC_START, VMALLOC_END),
352	#ifdef CONFIG_SPARSEMEM_VMEMMAP
353	MLM((unsigned long)virt_to_page(PAGE_OFFSET),
354	(unsigned long)virt_to_page(high_memory)),
355	#endif
356	MLM(MODULES_VADDR, MODULES_END),
357	MLM(PAGE_OFFSET, (unsigned long)high_memory),
358
359	MLK_ROUNDUP(__init_begin, __init_end),
360	MLK_ROUNDUP(_text, _etext),
361	MLK_ROUNDUP(_sdata, _edata));
362
363	#undef MLK
364	#undef MLM
365	#undef MLK_ROUNDUP
366
367	/*
368	* Check boundaries twice: Some fundamental inconsistencies can be
369	* detected at build time already.
370	*/
371	#ifdef CONFIG_COMPAT
372	BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
373	#endif
374	BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
375	BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
376
377	if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
378	extern int sysctl_overcommit_memory;
379	/*
380	* On a machine this small we won't get anywhere without
381	* overcommit, so turn it on by default.
382	*/
383	sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
384	}
385	}
386
387	void free_initmem(void)
388	{
389	poison_init_mem(__init_begin, __init_end - __init_begin);
dbe67df4	390	free_initmem_default(-1);
c1cc1552 CM	391	}
	392
	393	#ifdef CONFIG_BLK_DEV_INITRD
	394
	395	static int keep_initrd;
	396
	397	void free_initrd_mem(unsigned long start, unsigned long end)
	398	{
	399	if (!keep_initrd) {
	400	poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
dbe67df4	401	free_reserved_area((void )start, (void )end, -1, "initrd");
c1cc1552 CM	402	}
	403	}
	404
	405	static int __init keepinitrd_setup(char *__unused)
	406	{
	407	keep_initrd = 1;
	408	return 1;
	409	}
	410
	411	__setup("keepinitrd", keepinitrd_setup);
	412	#endif