[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 <linux/dma-contiguous.h>

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

#include "mm.h"

phys_addr_t memstart_addr __read_mostly = 0;

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

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

		initrd_start = (unsigned long)__va(start);
		initrd_end = (unsigned long)__va(start + size);
	}
	return 0;
}
early_param("initrd", early_initrd);
#endif

#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 (initrd_start)
		memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start);
#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);
	}

	dma_contiguous_reserve(0);

	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;
}

#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)
{
	arm64_swiotlb_init();

	max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;

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

	mem_init_print_info(NULL);

#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 && get_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)
{
	free_initmem_default(0);
}

#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, 0, "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>
6ac2104d	33	#include <linux/dma-contiguous.h>
c1cc1552	34
c1cc1552 CM	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
c1cc1552 CM	42	phys_addr_t memstart_addr __read_mostly = 0;
c1cc1552 CM	43
ec2eaa73	44	#ifdef CONFIG_BLK_DEV_INITRD
c1cc1552 CM	45	static int __init early_initrd(char *p)
	46	{
	47	unsigned long start, size;
	48	char *endp;
	49
	50	start = memparse(p, &endp);
	51	if (*endp == ',') {
	52	size = memparse(endp + 1, NULL);
	53
ec2eaa73 RH	54	initrd_start = (unsigned long)__va(start);
ec2eaa73 RH	55	initrd_end = (unsigned long)__va(start + size);
c1cc1552 CM	56	}
	57	return 0;
	58	}
	59	early_param("initrd", early_initrd);
ec2eaa73	60	#endif
c1cc1552 CM	61
	62	#define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT)
	63
	64	static void __init zone_sizes_init(unsigned long min, unsigned long max)
	65	{
	66	struct memblock_region *reg;
	67	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
	68	unsigned long max_dma32 = min;
	69
	70	memset(zone_size, 0, sizeof(zone_size));
	71
	72	#ifdef CONFIG_ZONE_DMA32
	73	/* 4GB maximum for 32-bit only capable devices */
938edf5c WD	74	max_dma32 = max(min, min(max, MAX_DMA32_PFN));
938edf5c WD	75	zone_size[ZONE_DMA32] = max_dma32 - min;
c1cc1552 CM	76	#endif
	77	zone_size[ZONE_NORMAL] = max - max_dma32;
	78
	79	memcpy(zhole_size, zone_size, sizeof(zhole_size));
	80
	81	for_each_memblock(memory, reg) {
	82	unsigned long start = memblock_region_memory_base_pfn(reg);
	83	unsigned long end = memblock_region_memory_end_pfn(reg);
	84
	85	if (start >= max)
	86	continue;
	87	#ifdef CONFIG_ZONE_DMA32
	88	if (start < max_dma32) {
	89	unsigned long dma_end = min(end, max_dma32);
	90	zhole_size[ZONE_DMA32] -= dma_end - start;
	91	}
	92	#endif
	93	if (end > max_dma32) {
	94	unsigned long normal_end = min(end, max);
	95	unsigned long normal_start = max(start, max_dma32);
	96	zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
	97	}
	98	}
	99
	100	free_area_init_node(0, zone_size, min, zhole_size);
	101	}
	102
	103	#ifdef CONFIG_HAVE_ARCH_PFN_VALID
	104	int pfn_valid(unsigned long pfn)
	105	{
	106	return memblock_is_memory(pfn << PAGE_SHIFT);
	107	}
	108	EXPORT_SYMBOL(pfn_valid);
	109	#endif
	110
	111	#ifndef CONFIG_SPARSEMEM
	112	static void arm64_memory_present(void)
	113	{
	114	}
	115	#else
	116	static void arm64_memory_present(void)
	117	{
	118	struct memblock_region *reg;
	119
	120	for_each_memblock(memory, reg)
	121	memory_present(0, memblock_region_memory_base_pfn(reg),
	122	memblock_region_memory_end_pfn(reg));
	123	}
	124	#endif
	125
	126	void __init arm64_memblock_init(void)
	127	{
	128	u64 *reserve_map, base, size;
	129
	130	/* Register the kernel text, kernel data and initrd with memblock */
	131	memblock_reserve(__pa(_text), _end - _text);
	132	#ifdef CONFIG_BLK_DEV_INITRD
ec2eaa73 RH	133	if (initrd_start)
ec2eaa73 RH	134	memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start);
c1cc1552 CM	135	#endif
	136
	137	/*
	138	* Reserve the page tables. These are already in use,
	139	* and can only be in node 0.
	140	*/
	141	memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE);
	142	memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE);
	143
	144	/* Reserve the dtb region */
	145	memblock_reserve(virt_to_phys(initial_boot_params),
	146	be32_to_cpu(initial_boot_params->totalsize));
	147
	148	/*
	149	* Process the reserve map. This will probably overlap the initrd
	150	* and dtb locations which are already reserved, but overlapping
	151	* doesn't hurt anything
	152	*/
	153	reserve_map = ((void*)initial_boot_params) +
	154	be32_to_cpu(initial_boot_params->off_mem_rsvmap);
	155	while (1) {
	156	base = be64_to_cpup(reserve_map++);
	157	size = be64_to_cpup(reserve_map++);
	158	if (!size)
	159	break;
	160	memblock_reserve(base, size);
	161	}
	162
6ac2104d LA	163	dma_contiguous_reserve(0);
6ac2104d LA	164
c1cc1552 CM	165	memblock_allow_resize();
	166	memblock_dump_all();
	167	}
	168
	169	void __init bootmem_init(void)
	170	{
	171	unsigned long min, max;
	172
	173	min = PFN_UP(memblock_start_of_DRAM());
	174	max = PFN_DOWN(memblock_end_of_DRAM());
	175
	176	/*
	177	* Sparsemem tries to allocate bootmem in memory_present(), so must be
	178	* done after the fixed reservations.
	179	*/
	180	arm64_memory_present();
	181
	182	sparse_init();
	183	zone_sizes_init(min, max);
	184
	185	high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
	186	max_pfn = max_low_pfn = max;
	187	}
	188
c1cc1552 CM	189	#ifndef CONFIG_SPARSEMEM_VMEMMAP
	190	static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
	191	{
	192	struct page start_pg, end_pg;
	193	unsigned long pg, pgend;
	194
	195	/*
	196	* Convert start_pfn/end_pfn to a struct page pointer.
	197	*/
	198	start_pg = pfn_to_page(start_pfn - 1) + 1;
	199	end_pg = pfn_to_page(end_pfn - 1) + 1;
	200
	201	/*
	202	* Convert to physical addresses, and round start upwards and end
	203	* downwards.
	204	*/
	205	pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
	206	pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
	207
	208	/*
	209	* If there are free pages between these, free the section of the
	210	* memmap array.
	211	*/
	212	if (pg < pgend)
	213	free_bootmem(pg, pgend - pg);
	214	}
	215
	216	/*
	217	* The mem_map array can get very big. Free the unused area of the memory map.
	218	*/
	219	static void __init free_unused_memmap(void)
	220	{
	221	unsigned long start, prev_end = 0;
	222	struct memblock_region *reg;
	223
	224	for_each_memblock(memory, reg) {
	225	start = __phys_to_pfn(reg->base);
	226
	227	#ifdef CONFIG_SPARSEMEM
	228	/*
	229	* Take care not to free memmap entries that don't exist due
	230	* to SPARSEMEM sections which aren't present.
	231	*/
	232	start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
	233	#endif
	234	/*
	235	* If we had a previous bank, and there is a space between the
	236	* current bank and the previous, free it.
	237	*/
	238	if (prev_end && prev_end < start)
	239	free_memmap(prev_end, start);
	240
	241	/*
	242	* Align up here since the VM subsystem insists that the
	243	* memmap entries are valid from the bank end aligned to
	244	* MAX_ORDER_NR_PAGES.
	245	*/
	246	prev_end = ALIGN(start + __phys_to_pfn(reg->size),
	247	MAX_ORDER_NR_PAGES);
	248	}
	249
	250	#ifdef CONFIG_SPARSEMEM
	251	if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
	252	free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
253	#endif
254	}
255	#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
256
257	/*
258	* mem_init() marks the free areas in the mem_map and tells us how much memory
259	* is free. This is done after various parts of the system have claimed their
260	* memory after the kernel image.
261	*/
262	void __init mem_init(void)
263	{
27222a3d	264	arm64_swiotlb_init();
c1cc1552 CM	265
	266	max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
	267
	268	#ifndef CONFIG_SPARSEMEM_VMEMMAP
c1cc1552 CM	269	free_unused_memmap();
c1cc1552 CM	270	#endif
bee4ebd1	271	/* this will put all unused low memory onto the freelists */
0c988534	272	free_all_bootmem();
c1cc1552	273
6879ea83	274	mem_init_print_info(NULL);
c1cc1552 CM	275
	276	#define MLK(b, t) b, t, ((t) - (b)) >> 10
	277	#define MLM(b, t) b, t, ((t) - (b)) >> 20
	278	#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
	279
	280	pr_notice("Virtual kernel memory layout:\n"
	281	" vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n"
	282	#ifdef CONFIG_SPARSEMEM_VMEMMAP
	283	" vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n"
	284	#endif
	285	" modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
	286	" memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
	287	" .init : 0x%p" " - 0x%p" " (%6ld kB)\n"
	288	" .text : 0x%p" " - 0x%p" " (%6ld kB)\n"
	289	" .data : 0x%p" " - 0x%p" " (%6ld kB)\n",
	290	MLM(VMALLOC_START, VMALLOC_END),
	291	#ifdef CONFIG_SPARSEMEM_VMEMMAP
	292	MLM((unsigned long)virt_to_page(PAGE_OFFSET),
	293	(unsigned long)virt_to_page(high_memory)),
	294	#endif
	295	MLM(MODULES_VADDR, MODULES_END),
	296	MLM(PAGE_OFFSET, (unsigned long)high_memory),
	297
	298	MLK_ROUNDUP(__init_begin, __init_end),
	299	MLK_ROUNDUP(_text, _etext),
	300	MLK_ROUNDUP(_sdata, _edata));
	301
	302	#undef MLK
	303	#undef MLM
	304	#undef MLK_ROUNDUP
	305
	306	/*
	307	* Check boundaries twice: Some fundamental inconsistencies can be
	308	* detected at build time already.
	309	*/
	310	#ifdef CONFIG_COMPAT
	311	BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
	312	#endif
	313	BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
	314	BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
	315
bee4ebd1	316	if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
c1cc1552 CM	317	extern int sysctl_overcommit_memory;
	318	/*
	319	* On a machine this small we won't get anywhere without
	320	* overcommit, so turn it on by default.
	321	*/
	322	sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
	323	}
	324	}
	325
	326	void free_initmem(void)
	327	{
9af5b807	328	free_initmem_default(0);
c1cc1552 CM	329	}
	330
	331	#ifdef CONFIG_BLK_DEV_INITRD
	332
	333	static int keep_initrd;
	334
	335	void free_initrd_mem(unsigned long start, unsigned long end)
	336	{
9af5b807 JL	337	if (!keep_initrd)
9af5b807 JL	338	free_reserved_area((void )start, (void )end, 0, "initrd");
c1cc1552 CM	339	}
	340
	341	static int __init keepinitrd_setup(char *__unused)
	342	{
	343	keep_initrd = 1;
	344	return 1;
	345	}
	346
	347	__setup("keepinitrd", keepinitrd_setup);
	348	#endif