[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-mapping.h>
#include <linux/dma-contiguous.h>
#include <linux/efi.h>

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

/*
 * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
 * currently assumes that for memory starting above 4G, 32-bit devices will
 * use a DMA offset.
 */
static phys_addr_t max_zone_dma_phys(void)
{
	phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
	return min(offset + (1ULL << 32), memblock_end_of_DRAM());
}

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_dma = min;

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

	/* 4GB maximum for 32-bit only capable devices */
	if (IS_ENABLED(CONFIG_ZONE_DMA)) {
		max_dma = PFN_DOWN(max_zone_dma_phys());
		zone_size[ZONE_DMA] = max_dma - min;
	}
	zone_size[ZONE_NORMAL] = max - max_dma;

	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;

		if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) {
			unsigned long dma_end = min(end, max_dma);
			zhole_size[ZONE_DMA] -= dma_end - start;
		}

		if (end > max_dma) {
			unsigned long normal_end = min(end, max);
			unsigned long normal_start = max(start, max_dma);
			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)
{
	phys_addr_t dma_phys_limit = 0;

	/*
	 * Register the kernel text, kernel data, initrd, and initial
	 * pagetables 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

	early_init_fdt_scan_reserved_mem();

	/* 4GB maximum for 32-bit only capable devices */
	if (IS_ENABLED(CONFIG_ZONE_DMA))
		dma_phys_limit = max_zone_dma_phys();
	dma_contiguous_reserve(dma_phys_limit);

	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)
{
	set_max_mapnr(pfn_to_page(max_pfn) - 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 MLG(b, t) b, t, ((t) - (b)) >> 30
#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 GB)\n"
#ifdef CONFIG_SPARSEMEM_VMEMMAP
		  "    vmemmap : 0x%16lx - 0x%16lx   (%6ld GB maximum)\n"
		  "              0x%16lx - 0x%16lx   (%6ld MB actual)\n"
#endif
		  "    PCI I/O : 0x%16lx - 0x%16lx   (%6ld MB)\n"
		  "    fixed   : 0x%16lx - 0x%16lx   (%6ld KB)\n"
		  "    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",
		  MLG(VMALLOC_START, VMALLOC_END),
#ifdef CONFIG_SPARSEMEM_VMEMMAP
		  MLG((unsigned long)vmemmap,
		      (unsigned long)vmemmap + VMEMMAP_SIZE),
		  MLM((unsigned long)virt_to_page(PAGE_OFFSET),
		      (unsigned long)virt_to_page(high_memory)),
#endif
		  MLM((unsigned long)PCI_IOBASE, (unsigned long)PCI_IOBASE + SZ_16M),
		  MLK(FIXADDR_START, FIXADDR_TOP),
		  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);
	free_alternatives_memory();
}

#ifdef CONFIG_BLK_DEV_INITRD

static int keep_initrd;

void free_initrd_mem(unsigned long start, unsigned long end)
{
	if (!keep_initrd) {
		if (start == initrd_start)
			start = round_down(start, PAGE_SIZE);
		if (end == initrd_end)
			end = round_up(end, PAGE_SIZE);

		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>
19e7640d	33	#include <linux/dma-mapping.h>
6ac2104d	34	#include <linux/dma-contiguous.h>
86c8b27a	35	#include <linux/efi.h>
c1cc1552	36
08375198	37	#include <asm/fixmap.h>
c1cc1552 CM	38	#include <asm/sections.h>
	39	#include <asm/setup.h>
	40	#include <asm/sizes.h>
	41	#include <asm/tlb.h>
e039ee4e	42	#include <asm/alternative.h>
c1cc1552 CM	43
	44	#include "mm.h"
	45
c1cc1552 CM	46	phys_addr_t memstart_addr __read_mostly = 0;
c1cc1552 CM	47
ec2eaa73	48	#ifdef CONFIG_BLK_DEV_INITRD
c1cc1552 CM	49	static int __init early_initrd(char *p)
	50	{
	51	unsigned long start, size;
	52	char *endp;
	53
	54	start = memparse(p, &endp);
	55	if (*endp == ',') {
	56	size = memparse(endp + 1, NULL);
	57
ec2eaa73 RH	58	initrd_start = (unsigned long)__va(start);
ec2eaa73 RH	59	initrd_end = (unsigned long)__va(start + size);
c1cc1552 CM	60	}
	61	return 0;
	62	}
	63	early_param("initrd", early_initrd);
ec2eaa73	64	#endif
c1cc1552	65
d50314a6 CM	66	/*
	67	* Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
	68	* currently assumes that for memory starting above 4G, 32-bit devices will
	69	* use a DMA offset.
	70	*/
	71	static phys_addr_t max_zone_dma_phys(void)
	72	{
	73	phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
	74	return min(offset + (1ULL << 32), memblock_end_of_DRAM());
	75	}
	76
c1cc1552 CM	77	static void __init zone_sizes_init(unsigned long min, unsigned long max)
	78	{
	79	struct memblock_region *reg;
	80	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
19e7640d	81	unsigned long max_dma = min;
c1cc1552 CM	82
	83	memset(zone_size, 0, sizeof(zone_size));
	84
c1cc1552	85	/* 4GB maximum for 32-bit only capable devices */
19e7640d	86	if (IS_ENABLED(CONFIG_ZONE_DMA)) {
d50314a6	87	max_dma = PFN_DOWN(max_zone_dma_phys());
19e7640d CM	88	zone_size[ZONE_DMA] = max_dma - min;
	89	}
	90	zone_size[ZONE_NORMAL] = max - max_dma;
c1cc1552 CM	91
	92	memcpy(zhole_size, zone_size, sizeof(zhole_size));
	93
	94	for_each_memblock(memory, reg) {
	95	unsigned long start = memblock_region_memory_base_pfn(reg);
	96	unsigned long end = memblock_region_memory_end_pfn(reg);
	97
	98	if (start >= max)
	99	continue;
19e7640d CM	100
	101	if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) {
	102	unsigned long dma_end = min(end, max_dma);
	103	zhole_size[ZONE_DMA] -= dma_end - start;
c1cc1552	104	}
19e7640d CM	105
19e7640d CM	106	if (end > max_dma) {
c1cc1552	107	unsigned long normal_end = min(end, max);
19e7640d	108	unsigned long normal_start = max(start, max_dma);
c1cc1552 CM	109	zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
	110	}
	111	}
	112
	113	free_area_init_node(0, zone_size, min, zhole_size);
	114	}
	115
	116	#ifdef CONFIG_HAVE_ARCH_PFN_VALID
	117	int pfn_valid(unsigned long pfn)
	118	{
	119	return memblock_is_memory(pfn << PAGE_SHIFT);
	120	}
	121	EXPORT_SYMBOL(pfn_valid);
	122	#endif
	123
	124	#ifndef CONFIG_SPARSEMEM
	125	static void arm64_memory_present(void)
	126	{
	127	}
	128	#else
	129	static void arm64_memory_present(void)
	130	{
	131	struct memblock_region *reg;
	132
	133	for_each_memblock(memory, reg)
	134	memory_present(0, memblock_region_memory_base_pfn(reg),
	135	memblock_region_memory_end_pfn(reg));
	136	}
	137	#endif
	138
	139	void __init arm64_memblock_init(void)
	140	{
2d5a5612 CM	141	phys_addr_t dma_phys_limit = 0;
2d5a5612 CM	142
bd00cd5f MR	143	/*
	144	* Register the kernel text, kernel data, initrd, and initial
	145	* pagetables with memblock.
	146	*/
c1cc1552 CM	147	memblock_reserve(__pa(_text), _end - _text);
c1cc1552 CM	148	#ifdef CONFIG_BLK_DEV_INITRD
ec2eaa73 RH	149	if (initrd_start)
ec2eaa73 RH	150	memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start);
c1cc1552 CM	151	#endif
c1cc1552 CM	152
0ceac9e0	153	early_init_fdt_scan_reserved_mem();
2d5a5612 CM	154
	155	/* 4GB maximum for 32-bit only capable devices */
	156	if (IS_ENABLED(CONFIG_ZONE_DMA))
d50314a6	157	dma_phys_limit = max_zone_dma_phys();
2d5a5612	158	dma_contiguous_reserve(dma_phys_limit);
6ac2104d	159
c1cc1552 CM	160	memblock_allow_resize();
	161	memblock_dump_all();
	162	}
	163
	164	void __init bootmem_init(void)
	165	{
	166	unsigned long min, max;
	167
	168	min = PFN_UP(memblock_start_of_DRAM());
	169	max = PFN_DOWN(memblock_end_of_DRAM());
	170
	171	/*
	172	* Sparsemem tries to allocate bootmem in memory_present(), so must be
	173	* done after the fixed reservations.
	174	*/
	175	arm64_memory_present();
	176
	177	sparse_init();
	178	zone_sizes_init(min, max);
	179
	180	high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
	181	max_pfn = max_low_pfn = max;
	182	}
	183
c1cc1552 CM	184	#ifndef CONFIG_SPARSEMEM_VMEMMAP
	185	static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
	186	{
	187	struct page start_pg, end_pg;
	188	unsigned long pg, pgend;
	189
	190	/*
	191	* Convert start_pfn/end_pfn to a struct page pointer.
	192	*/
	193	start_pg = pfn_to_page(start_pfn - 1) + 1;
	194	end_pg = pfn_to_page(end_pfn - 1) + 1;
	195
	196	/*
	197	* Convert to physical addresses, and round start upwards and end
	198	* downwards.
	199	*/
	200	pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
	201	pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
	202
	203	/*
	204	* If there are free pages between these, free the section of the
	205	* memmap array.
	206	*/
	207	if (pg < pgend)
	208	free_bootmem(pg, pgend - pg);
	209	}
	210
	211	/*
	212	* The mem_map array can get very big. Free the unused area of the memory map.
	213	*/
	214	static void __init free_unused_memmap(void)
	215	{
	216	unsigned long start, prev_end = 0;
	217	struct memblock_region *reg;
	218
	219	for_each_memblock(memory, reg) {
	220	start = __phys_to_pfn(reg->base);
	221
	222	#ifdef CONFIG_SPARSEMEM
	223	/*
	224	* Take care not to free memmap entries that don't exist due
	225	* to SPARSEMEM sections which aren't present.
	226	*/
	227	start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
	228	#endif
	229	/*
	230	* If we had a previous bank, and there is a space between the
	231	* current bank and the previous, free it.
	232	*/
	233	if (prev_end && prev_end < start)
	234	free_memmap(prev_end, start);
	235
	236	/*
	237	* Align up here since the VM subsystem insists that the
	238	* memmap entries are valid from the bank end aligned to
	239	* MAX_ORDER_NR_PAGES.
	240	*/
	241	prev_end = ALIGN(start + __phys_to_pfn(reg->size),
	242	MAX_ORDER_NR_PAGES);
	243	}
	244
	245	#ifdef CONFIG_SPARSEMEM
	246	if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
	247	free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
248	#endif
249	}
250	#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
251
252	/*
253	* mem_init() marks the free areas in the mem_map and tells us how much memory
254	* is free. This is done after various parts of the system have claimed their
255	* memory after the kernel image.
256	*/
257	void __init mem_init(void)
258	{
a6583c7c	259	set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
c1cc1552 CM	260
c1cc1552 CM	261	#ifndef CONFIG_SPARSEMEM_VMEMMAP
c1cc1552 CM	262	free_unused_memmap();
c1cc1552 CM	263	#endif
bee4ebd1	264	/* this will put all unused low memory onto the freelists */
0c988534	265	free_all_bootmem();
c1cc1552	266
6879ea83	267	mem_init_print_info(NULL);
c1cc1552 CM	268
	269	#define MLK(b, t) b, t, ((t) - (b)) >> 10
	270	#define MLM(b, t) b, t, ((t) - (b)) >> 20
08375198	271	#define MLG(b, t) b, t, ((t) - (b)) >> 30
c1cc1552 CM	272	#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
	273
	274	pr_notice("Virtual kernel memory layout:\n"
08375198	275	" vmalloc : 0x%16lx - 0x%16lx (%6ld GB)\n"
c1cc1552	276	#ifdef CONFIG_SPARSEMEM_VMEMMAP
08375198 CM	277	" vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n"
08375198 CM	278	" 0x%16lx - 0x%16lx (%6ld MB actual)\n"
c1cc1552	279	#endif
08375198 CM	280	" PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n"
08375198 CM	281	" fixed : 0x%16lx - 0x%16lx (%6ld KB)\n"
c1cc1552 CM	282	" modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
c1cc1552 CM	283	" memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
08375198 CM	284	" .init : 0x%p" " - 0x%p" " (%6ld KB)\n"
	285	" .text : 0x%p" " - 0x%p" " (%6ld KB)\n"
	286	" .data : 0x%p" " - 0x%p" " (%6ld KB)\n",
	287	MLG(VMALLOC_START, VMALLOC_END),
c1cc1552	288	#ifdef CONFIG_SPARSEMEM_VMEMMAP
08375198 CM	289	MLG((unsigned long)vmemmap,
08375198 CM	290	(unsigned long)vmemmap + VMEMMAP_SIZE),
c1cc1552 CM	291	MLM((unsigned long)virt_to_page(PAGE_OFFSET),
	292	(unsigned long)virt_to_page(high_memory)),
	293	#endif
08375198 CM	294	MLM((unsigned long)PCI_IOBASE, (unsigned long)PCI_IOBASE + SZ_16M),
08375198 CM	295	MLK(FIXADDR_START, FIXADDR_TOP),
c1cc1552 CM	296	MLM(MODULES_VADDR, MODULES_END),
c1cc1552 CM	297	MLM(PAGE_OFFSET, (unsigned long)high_memory),
c1cc1552 CM	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);
e039ee4e	329	free_alternatives_memory();
c1cc1552 CM	330	}
	331
	332	#ifdef CONFIG_BLK_DEV_INITRD
	333
	334	static int keep_initrd;
	335
	336	void free_initrd_mem(unsigned long start, unsigned long end)
	337	{
421520ba YW	338	if (!keep_initrd) {
	339	if (start == initrd_start)
	340	start = round_down(start, PAGE_SIZE);
	341	if (end == initrd_end)
	342	end = round_up(end, PAGE_SIZE);
	343
9af5b807	344	free_reserved_area((void )start, (void )end, 0, "initrd");
421520ba	345	}
c1cc1552 CM	346	}
	347
	348	static int __init keepinitrd_setup(char *__unused)
	349	{
	350	keep_initrd = 1;
	351	return 1;
	352	}
	353
	354	__setup("keepinitrd", keepinitrd_setup);
	355	#endif