[deliverable/linux.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 <asm/fixmap.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

/*
 * 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)
{
	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 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);
}

#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>
19e7640d	33	#include <linux/dma-mapping.h>
6ac2104d	34	#include <linux/dma-contiguous.h>
c1cc1552	35
08375198	36	#include <asm/fixmap.h>
c1cc1552 CM	37	#include <asm/sections.h>
	38	#include <asm/setup.h>
	39	#include <asm/sizes.h>
	40	#include <asm/tlb.h>
	41
	42	#include "mm.h"
	43
c1cc1552 CM	44	phys_addr_t memstart_addr __read_mostly = 0;
c1cc1552 CM	45
ec2eaa73	46	#ifdef CONFIG_BLK_DEV_INITRD
c1cc1552 CM	47	static int __init early_initrd(char *p)
	48	{
	49	unsigned long start, size;
	50	char *endp;
	51
	52	start = memparse(p, &endp);
	53	if (*endp == ',') {
	54	size = memparse(endp + 1, NULL);
	55
ec2eaa73 RH	56	initrd_start = (unsigned long)__va(start);
ec2eaa73 RH	57	initrd_end = (unsigned long)__va(start + size);
c1cc1552 CM	58	}
	59	return 0;
	60	}
	61	early_param("initrd", early_initrd);
ec2eaa73	62	#endif
c1cc1552	63
d50314a6 CM	64	/*
	65	* Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
	66	* currently assumes that for memory starting above 4G, 32-bit devices will
	67	* use a DMA offset.
	68	*/
	69	static phys_addr_t max_zone_dma_phys(void)
	70	{
	71	phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
	72	return min(offset + (1ULL << 32), memblock_end_of_DRAM());
	73	}
	74
c1cc1552 CM	75	static void __init zone_sizes_init(unsigned long min, unsigned long max)
	76	{
	77	struct memblock_region *reg;
	78	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
19e7640d	79	unsigned long max_dma = min;
c1cc1552 CM	80
	81	memset(zone_size, 0, sizeof(zone_size));
	82
c1cc1552	83	/* 4GB maximum for 32-bit only capable devices */
19e7640d	84	if (IS_ENABLED(CONFIG_ZONE_DMA)) {
d50314a6	85	max_dma = PFN_DOWN(max_zone_dma_phys());
19e7640d CM	86	zone_size[ZONE_DMA] = max_dma - min;
	87	}
	88	zone_size[ZONE_NORMAL] = max - max_dma;
c1cc1552 CM	89
	90	memcpy(zhole_size, zone_size, sizeof(zhole_size));
	91
	92	for_each_memblock(memory, reg) {
	93	unsigned long start = memblock_region_memory_base_pfn(reg);
	94	unsigned long end = memblock_region_memory_end_pfn(reg);
	95
	96	if (start >= max)
	97	continue;
19e7640d CM	98
	99	if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) {
	100	unsigned long dma_end = min(end, max_dma);
	101	zhole_size[ZONE_DMA] -= dma_end - start;
c1cc1552	102	}
19e7640d CM	103
19e7640d CM	104	if (end > max_dma) {
c1cc1552	105	unsigned long normal_end = min(end, max);
19e7640d	106	unsigned long normal_start = max(start, max_dma);
c1cc1552 CM	107	zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
	108	}
	109	}
	110
	111	free_area_init_node(0, zone_size, min, zhole_size);
	112	}
	113
	114	#ifdef CONFIG_HAVE_ARCH_PFN_VALID
	115	int pfn_valid(unsigned long pfn)
	116	{
	117	return memblock_is_memory(pfn << PAGE_SHIFT);
	118	}
	119	EXPORT_SYMBOL(pfn_valid);
	120	#endif
	121
	122	#ifndef CONFIG_SPARSEMEM
	123	static void arm64_memory_present(void)
	124	{
	125	}
	126	#else
	127	static void arm64_memory_present(void)
	128	{
	129	struct memblock_region *reg;
	130
	131	for_each_memblock(memory, reg)
	132	memory_present(0, memblock_region_memory_base_pfn(reg),
	133	memblock_region_memory_end_pfn(reg));
	134	}
	135	#endif
	136
	137	void __init arm64_memblock_init(void)
	138	{
2d5a5612 CM	139	phys_addr_t dma_phys_limit = 0;
2d5a5612 CM	140
bd00cd5f MR	141	/*
	142	* Register the kernel text, kernel data, initrd, and initial
	143	* pagetables with memblock.
	144	*/
c1cc1552 CM	145	memblock_reserve(__pa(_text), _end - _text);
c1cc1552 CM	146	#ifdef CONFIG_BLK_DEV_INITRD
ec2eaa73 RH	147	if (initrd_start)
ec2eaa73 RH	148	memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start);
c1cc1552 CM	149	#endif
c1cc1552 CM	150
9bf14b7c	151	early_init_fdt_scan_reserved_mem();
2d5a5612 CM	152
	153	/* 4GB maximum for 32-bit only capable devices */
	154	if (IS_ENABLED(CONFIG_ZONE_DMA))
d50314a6	155	dma_phys_limit = max_zone_dma_phys();
2d5a5612	156	dma_contiguous_reserve(dma_phys_limit);
6ac2104d	157
c1cc1552 CM	158	memblock_allow_resize();
	159	memblock_dump_all();
	160	}
	161
	162	void __init bootmem_init(void)
	163	{
	164	unsigned long min, max;
	165
	166	min = PFN_UP(memblock_start_of_DRAM());
	167	max = PFN_DOWN(memblock_end_of_DRAM());
	168
	169	/*
	170	* Sparsemem tries to allocate bootmem in memory_present(), so must be
	171	* done after the fixed reservations.
	172	*/
	173	arm64_memory_present();
	174
	175	sparse_init();
	176	zone_sizes_init(min, max);
	177
	178	high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
	179	max_pfn = max_low_pfn = max;
	180	}
	181
c1cc1552 CM	182	#ifndef CONFIG_SPARSEMEM_VMEMMAP
	183	static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
	184	{
	185	struct page start_pg, end_pg;
	186	unsigned long pg, pgend;
	187
	188	/*
	189	* Convert start_pfn/end_pfn to a struct page pointer.
	190	*/
	191	start_pg = pfn_to_page(start_pfn - 1) + 1;
	192	end_pg = pfn_to_page(end_pfn - 1) + 1;
	193
	194	/*
	195	* Convert to physical addresses, and round start upwards and end
	196	* downwards.
	197	*/
	198	pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
	199	pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
	200
	201	/*
	202	* If there are free pages between these, free the section of the
	203	* memmap array.
	204	*/
	205	if (pg < pgend)
	206	free_bootmem(pg, pgend - pg);
	207	}
	208
	209	/*
	210	* The mem_map array can get very big. Free the unused area of the memory map.
	211	*/
	212	static void __init free_unused_memmap(void)
	213	{
	214	unsigned long start, prev_end = 0;
	215	struct memblock_region *reg;
	216
	217	for_each_memblock(memory, reg) {
	218	start = __phys_to_pfn(reg->base);
	219
	220	#ifdef CONFIG_SPARSEMEM
	221	/*
	222	* Take care not to free memmap entries that don't exist due
	223	* to SPARSEMEM sections which aren't present.
	224	*/
	225	start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
	226	#endif
	227	/*
	228	* If we had a previous bank, and there is a space between the
	229	* current bank and the previous, free it.
	230	*/
	231	if (prev_end && prev_end < start)
	232	free_memmap(prev_end, start);
	233
	234	/*
	235	* Align up here since the VM subsystem insists that the
	236	* memmap entries are valid from the bank end aligned to
	237	* MAX_ORDER_NR_PAGES.
	238	*/
	239	prev_end = ALIGN(start + __phys_to_pfn(reg->size),
	240	MAX_ORDER_NR_PAGES);
	241	}
	242
	243	#ifdef CONFIG_SPARSEMEM
	244	if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
	245	free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
246	#endif
247	}
248	#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
249
250	/*
251	* mem_init() marks the free areas in the mem_map and tells us how much memory
252	* is free. This is done after various parts of the system have claimed their
253	* memory after the kernel image.
254	*/
255	void __init mem_init(void)
256	{
c1cc1552 CM	257	max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
	258
	259	#ifndef CONFIG_SPARSEMEM_VMEMMAP
c1cc1552 CM	260	free_unused_memmap();
c1cc1552 CM	261	#endif
bee4ebd1	262	/* this will put all unused low memory onto the freelists */
0c988534	263	free_all_bootmem();
c1cc1552	264
6879ea83	265	mem_init_print_info(NULL);
c1cc1552 CM	266
	267	#define MLK(b, t) b, t, ((t) - (b)) >> 10
	268	#define MLM(b, t) b, t, ((t) - (b)) >> 20
08375198	269	#define MLG(b, t) b, t, ((t) - (b)) >> 30
c1cc1552 CM	270	#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
	271
	272	pr_notice("Virtual kernel memory layout:\n"
08375198	273	" vmalloc : 0x%16lx - 0x%16lx (%6ld GB)\n"
c1cc1552	274	#ifdef CONFIG_SPARSEMEM_VMEMMAP
08375198 CM	275	" vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n"
08375198 CM	276	" 0x%16lx - 0x%16lx (%6ld MB actual)\n"
c1cc1552	277	#endif
08375198 CM	278	" PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n"
08375198 CM	279	" fixed : 0x%16lx - 0x%16lx (%6ld KB)\n"
c1cc1552 CM	280	" modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
c1cc1552 CM	281	" memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
08375198 CM	282	" .init : 0x%p" " - 0x%p" " (%6ld KB)\n"
	283	" .text : 0x%p" " - 0x%p" " (%6ld KB)\n"
	284	" .data : 0x%p" " - 0x%p" " (%6ld KB)\n",
	285	MLG(VMALLOC_START, VMALLOC_END),
c1cc1552	286	#ifdef CONFIG_SPARSEMEM_VMEMMAP
08375198 CM	287	MLG((unsigned long)vmemmap,
08375198 CM	288	(unsigned long)vmemmap + VMEMMAP_SIZE),
c1cc1552 CM	289	MLM((unsigned long)virt_to_page(PAGE_OFFSET),
	290	(unsigned long)virt_to_page(high_memory)),
	291	#endif
08375198 CM	292	MLM((unsigned long)PCI_IOBASE, (unsigned long)PCI_IOBASE + SZ_16M),
08375198 CM	293	MLK(FIXADDR_START, FIXADDR_TOP),
c1cc1552 CM	294	MLM(MODULES_VADDR, MODULES_END),
c1cc1552 CM	295	MLM(PAGE_OFFSET, (unsigned long)high_memory),
c1cc1552 CM	296	MLK_ROUNDUP(__init_begin, __init_end),
	297	MLK_ROUNDUP(_text, _etext),
	298	MLK_ROUNDUP(_sdata, _edata));
	299
	300	#undef MLK
	301	#undef MLM
	302	#undef MLK_ROUNDUP
	303
	304	/*
	305	* Check boundaries twice: Some fundamental inconsistencies can be
	306	* detected at build time already.
	307	*/
	308	#ifdef CONFIG_COMPAT
	309	BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
	310	#endif
	311	BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
	312	BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
	313
bee4ebd1	314	if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
c1cc1552 CM	315	extern int sysctl_overcommit_memory;
	316	/*
	317	* On a machine this small we won't get anywhere without
	318	* overcommit, so turn it on by default.
	319	*/
	320	sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
	321	}
	322	}
	323
	324	void free_initmem(void)
	325	{
9af5b807	326	free_initmem_default(0);
c1cc1552 CM	327	}
	328
	329	#ifdef CONFIG_BLK_DEV_INITRD
	330
	331	static int keep_initrd;
	332
	333	void free_initrd_mem(unsigned long start, unsigned long end)
	334	{
9af5b807 JL	335	if (!keep_initrd)
9af5b807 JL	336	free_reserved_area((void )start, (void )end, 0, "initrd");
c1cc1552 CM	337	}
	338
	339	static int __init keepinitrd_setup(char *__unused)
	340	{
	341	keep_initrd = 1;
	342	return 1;
	343	}
	344
	345	__setup("keepinitrd", keepinitrd_setup);
	346	#endif