[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 <linux/swiotlb.h>

#include <asm/fixmap.h>
#include <asm/kasan.h>
#include <asm/memory.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;
phys_addr_t arm64_dma_phys_limit __read_mostly;

#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 __init 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 */
#ifdef CONFIG_ZONE_DMA
	max_dma = PFN_DOWN(arm64_dma_phys_limit);
	zone_size[ZONE_DMA] = max_dma - min;
#endif
	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;

#ifdef CONFIG_ZONE_DMA
		if (start < max_dma) {
			unsigned long dma_end = min(end, max_dma);
			zhole_size[ZONE_DMA] -= dma_end - start;
		}
#endif
		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_map_memory(pfn << PAGE_SHIFT);
}
EXPORT_SYMBOL(pfn_valid);
#endif

#ifndef CONFIG_SPARSEMEM
static void __init arm64_memory_present(void)
{
}
#else
static void __init 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

static phys_addr_t memory_limit = (phys_addr_t)ULLONG_MAX;

/*
 * Limit the memory size that was specified via FDT.
 */
static int __init early_mem(char *p)
{
	if (!p)
		return 1;

	memory_limit = memparse(p, &p) & PAGE_MASK;
	pr_notice("Memory limited to %lldMB\n", memory_limit >> 20);

	return 0;
}
early_param("mem", early_mem);

void __init arm64_memblock_init(void)
{
	memblock_enforce_memory_limit(memory_limit);

	/*
	 * 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))
		arm64_dma_phys_limit = max_zone_dma_phys();
	else
		arm64_dma_phys_limit = PHYS_MASK + 1;
	dma_contiguous_reserve(arm64_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());

	early_memtest(min << PAGE_SHIFT, max << PAGE_SHIFT);

	/*
	 * 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(__phys_to_pfn(reg->base + 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)
{
	swiotlb_init(1);

	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"
#ifdef CONFIG_KASAN
		  "    kasan   : 0x%16lx - 0x%16lx   (%6ld GB)\n"
#endif
		  "    modules : 0x%16lx - 0x%16lx   (%6ld MB)\n"
		  "    vmalloc : 0x%16lx - 0x%16lx   (%6ld GB)\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"
#ifdef CONFIG_SPARSEMEM_VMEMMAP
		  "    vmemmap : 0x%16lx - 0x%16lx   (%6ld GB maximum)\n"
		  "              0x%16lx - 0x%16lx   (%6ld MB actual)\n"
#endif
		  "    fixed   : 0x%16lx - 0x%16lx   (%6ld KB)\n"
		  "    PCI I/O : 0x%16lx - 0x%16lx   (%6ld MB)\n"
		  "    memory  : 0x%16lx - 0x%16lx   (%6ld MB)\n",
#ifdef CONFIG_KASAN
		  MLG(KASAN_SHADOW_START, KASAN_SHADOW_END),
#endif
		  MLM(MODULES_VADDR, MODULES_END),
		  MLG(VMALLOC_START, VMALLOC_END),
		  MLK_ROUNDUP(__init_begin, __init_end),
		  MLK_ROUNDUP(_text, _etext),
		  MLK_ROUNDUP(_sdata, _edata),
#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
		  MLK(FIXADDR_START, FIXADDR_TOP),
		  MLM(PCI_IO_START, PCI_IO_END),
		  MLM(PAGE_OFFSET, (unsigned long)high_memory));

#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);
	fixup_init();
}

#ifdef CONFIG_BLK_DEV_INITRD

static int keep_initrd __initdata;

void __init 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>
86c8b27a	35	#include <linux/efi.h>
a1e50a82	36	#include <linux/swiotlb.h>
c1cc1552	37
08375198	38	#include <asm/fixmap.h>
f9040773	39	#include <asm/kasan.h>
aa03c428	40	#include <asm/memory.h>
c1cc1552 CM	41	#include <asm/sections.h>
	42	#include <asm/setup.h>
	43	#include <asm/sizes.h>
	44	#include <asm/tlb.h>
e039ee4e	45	#include <asm/alternative.h>
c1cc1552 CM	46
	47	#include "mm.h"
	48
c1cc1552	49	phys_addr_t memstart_addr __read_mostly = 0;
a1e50a82	50	phys_addr_t arm64_dma_phys_limit __read_mostly;
c1cc1552	51
ec2eaa73	52	#ifdef CONFIG_BLK_DEV_INITRD
c1cc1552 CM	53	static int __init early_initrd(char *p)
	54	{
	55	unsigned long start, size;
	56	char *endp;
	57
	58	start = memparse(p, &endp);
	59	if (*endp == ',') {
	60	size = memparse(endp + 1, NULL);
	61
ec2eaa73 RH	62	initrd_start = (unsigned long)__va(start);
ec2eaa73 RH	63	initrd_end = (unsigned long)__va(start + size);
c1cc1552 CM	64	}
	65	return 0;
	66	}
	67	early_param("initrd", early_initrd);
ec2eaa73	68	#endif
c1cc1552	69
d50314a6 CM	70	/*
	71	* Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
	72	* currently assumes that for memory starting above 4G, 32-bit devices will
	73	* use a DMA offset.
	74	*/
a7c61a34	75	static phys_addr_t __init max_zone_dma_phys(void)
d50314a6 CM	76	{
	77	phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
	78	return min(offset + (1ULL << 32), memblock_end_of_DRAM());
	79	}
	80
c1cc1552 CM	81	static void __init zone_sizes_init(unsigned long min, unsigned long max)
	82	{
	83	struct memblock_region *reg;
	84	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
19e7640d	85	unsigned long max_dma = min;
c1cc1552 CM	86
	87	memset(zone_size, 0, sizeof(zone_size));
	88
c1cc1552	89	/* 4GB maximum for 32-bit only capable devices */
86a5906e RM	90	#ifdef CONFIG_ZONE_DMA
	91	max_dma = PFN_DOWN(arm64_dma_phys_limit);
	92	zone_size[ZONE_DMA] = max_dma - min;
	93	#endif
19e7640d	94	zone_size[ZONE_NORMAL] = max - max_dma;
c1cc1552 CM	95
	96	memcpy(zhole_size, zone_size, sizeof(zhole_size));
	97
	98	for_each_memblock(memory, reg) {
	99	unsigned long start = memblock_region_memory_base_pfn(reg);
	100	unsigned long end = memblock_region_memory_end_pfn(reg);
	101
	102	if (start >= max)
	103	continue;
19e7640d	104
86a5906e RM	105	#ifdef CONFIG_ZONE_DMA
86a5906e RM	106	if (start < max_dma) {
19e7640d CM	107	unsigned long dma_end = min(end, max_dma);
19e7640d CM	108	zhole_size[ZONE_DMA] -= dma_end - start;
c1cc1552	109	}
86a5906e	110	#endif
19e7640d	111	if (end > max_dma) {
c1cc1552	112	unsigned long normal_end = min(end, max);
19e7640d	113	unsigned long normal_start = max(start, max_dma);
c1cc1552 CM	114	zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
	115	}
	116	}
	117
	118	free_area_init_node(0, zone_size, min, zhole_size);
	119	}
	120
	121	#ifdef CONFIG_HAVE_ARCH_PFN_VALID
	122	int pfn_valid(unsigned long pfn)
	123	{
68709f45	124	return memblock_is_map_memory(pfn << PAGE_SHIFT);
c1cc1552 CM	125	}
	126	EXPORT_SYMBOL(pfn_valid);
	127	#endif
	128
	129	#ifndef CONFIG_SPARSEMEM
a7c61a34	130	static void __init arm64_memory_present(void)
c1cc1552 CM	131	{
	132	}
	133	#else
a7c61a34	134	static void __init arm64_memory_present(void)
c1cc1552 CM	135	{
	136	struct memblock_region *reg;
	137
	138	for_each_memblock(memory, reg)
	139	memory_present(0, memblock_region_memory_base_pfn(reg),
	140	memblock_region_memory_end_pfn(reg));
	141	}
	142	#endif
	143
6083fe74 MR	144	static phys_addr_t memory_limit = (phys_addr_t)ULLONG_MAX;
	145
	146	/*
	147	* Limit the memory size that was specified via FDT.
	148	*/
	149	static int __init early_mem(char *p)
	150	{
	151	if (!p)
	152	return 1;
	153
	154	memory_limit = memparse(p, &p) & PAGE_MASK;
	155	pr_notice("Memory limited to %lldMB\n", memory_limit >> 20);
	156
	157	return 0;
	158	}
	159	early_param("mem", early_mem);
	160
c1cc1552 CM	161	void __init arm64_memblock_init(void)
c1cc1552 CM	162	{
6083fe74 MR	163	memblock_enforce_memory_limit(memory_limit);
6083fe74 MR	164
bd00cd5f MR	165	/*
	166	* Register the kernel text, kernel data, initrd, and initial
	167	* pagetables with memblock.
	168	*/
c1cc1552 CM	169	memblock_reserve(__pa(_text), _end - _text);
c1cc1552 CM	170	#ifdef CONFIG_BLK_DEV_INITRD
ec2eaa73 RH	171	if (initrd_start)
ec2eaa73 RH	172	memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start);
c1cc1552 CM	173	#endif
c1cc1552 CM	174
0ceac9e0	175	early_init_fdt_scan_reserved_mem();
2d5a5612 CM	176
	177	/* 4GB maximum for 32-bit only capable devices */
	178	if (IS_ENABLED(CONFIG_ZONE_DMA))
a1e50a82 CM	179	arm64_dma_phys_limit = max_zone_dma_phys();
	180	else
	181	arm64_dma_phys_limit = PHYS_MASK + 1;
	182	dma_contiguous_reserve(arm64_dma_phys_limit);
6ac2104d	183
c1cc1552 CM	184	memblock_allow_resize();
	185	memblock_dump_all();
	186	}
	187
	188	void __init bootmem_init(void)
	189	{
	190	unsigned long min, max;
	191
	192	min = PFN_UP(memblock_start_of_DRAM());
	193	max = PFN_DOWN(memblock_end_of_DRAM());
	194
36dd9086 VM	195	early_memtest(min << PAGE_SHIFT, max << PAGE_SHIFT);
36dd9086 VM	196
c1cc1552 CM	197	/*
	198	* Sparsemem tries to allocate bootmem in memory_present(), so must be
	199	* done after the fixed reservations.
	200	*/
	201	arm64_memory_present();
	202
	203	sparse_init();
	204	zone_sizes_init(min, max);
	205
	206	high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
	207	max_pfn = max_low_pfn = max;
	208	}
	209
c1cc1552 CM	210	#ifndef CONFIG_SPARSEMEM_VMEMMAP
	211	static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
	212	{
	213	struct page start_pg, end_pg;
	214	unsigned long pg, pgend;
	215
	216	/*
	217	* Convert start_pfn/end_pfn to a struct page pointer.
	218	*/
	219	start_pg = pfn_to_page(start_pfn - 1) + 1;
	220	end_pg = pfn_to_page(end_pfn - 1) + 1;
	221
	222	/*
	223	* Convert to physical addresses, and round start upwards and end
	224	* downwards.
	225	*/
	226	pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
	227	pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
	228
	229	/*
	230	* If there are free pages between these, free the section of the
	231	* memmap array.
	232	*/
	233	if (pg < pgend)
	234	free_bootmem(pg, pgend - pg);
	235	}
	236
	237	/*
	238	* The mem_map array can get very big. Free the unused area of the memory map.
	239	*/
	240	static void __init free_unused_memmap(void)
	241	{
	242	unsigned long start, prev_end = 0;
	243	struct memblock_region *reg;
	244
	245	for_each_memblock(memory, reg) {
	246	start = __phys_to_pfn(reg->base);
	247
	248	#ifdef CONFIG_SPARSEMEM
	249	/*
	250	* Take care not to free memmap entries that don't exist due
	251	* to SPARSEMEM sections which aren't present.
	252	*/
	253	start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
	254	#endif
	255	/*
	256	* If we had a previous bank, and there is a space between the
	257	* current bank and the previous, free it.
	258	*/
	259	if (prev_end && prev_end < start)
	260	free_memmap(prev_end, start);
	261
	262	/*
	263	* Align up here since the VM subsystem insists that the
	264	* memmap entries are valid from the bank end aligned to
	265	* MAX_ORDER_NR_PAGES.
	266	*/
b9bcc919	267	prev_end = ALIGN(__phys_to_pfn(reg->base + reg->size),
c1cc1552 CM	268	MAX_ORDER_NR_PAGES);
	269	}
	270
	271	#ifdef CONFIG_SPARSEMEM
	272	if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
	273	free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
	274	#endif
	275	}
	276	#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
	277
	278	/*
	279	* mem_init() marks the free areas in the mem_map and tells us how much memory
	280	* is free. This is done after various parts of the system have claimed their
	281	* memory after the kernel image.
	282	*/
	283	void __init mem_init(void)
	284	{
a1e50a82 CM	285	swiotlb_init(1);
a1e50a82 CM	286
a6583c7c	287	set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
c1cc1552 CM	288
c1cc1552 CM	289	#ifndef CONFIG_SPARSEMEM_VMEMMAP
c1cc1552 CM	290	free_unused_memmap();
c1cc1552 CM	291	#endif
bee4ebd1	292	/* this will put all unused low memory onto the freelists */
0c988534	293	free_all_bootmem();
c1cc1552	294
6879ea83	295	mem_init_print_info(NULL);
c1cc1552 CM	296
	297	#define MLK(b, t) b, t, ((t) - (b)) >> 10
	298	#define MLM(b, t) b, t, ((t) - (b)) >> 20
08375198	299	#define MLG(b, t) b, t, ((t) - (b)) >> 30
c1cc1552 CM	300	#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
	301
	302	pr_notice("Virtual kernel memory layout:\n"
ee7f881b LW	303	#ifdef CONFIG_KASAN
	304	" kasan : 0x%16lx - 0x%16lx (%6ld GB)\n"
	305	#endif
f9040773	306	" modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
08375198	307	" vmalloc : 0x%16lx - 0x%16lx (%6ld GB)\n"
f9040773 AB	308	" .init : 0x%p" " - 0x%p" " (%6ld KB)\n"
	309	" .text : 0x%p" " - 0x%p" " (%6ld KB)\n"
	310	" .data : 0x%p" " - 0x%p" " (%6ld KB)\n"
c1cc1552	311	#ifdef CONFIG_SPARSEMEM_VMEMMAP
08375198 CM	312	" vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n"
08375198 CM	313	" 0x%16lx - 0x%16lx (%6ld MB actual)\n"
c1cc1552	314	#endif
08375198	315	" fixed : 0x%16lx - 0x%16lx (%6ld KB)\n"
aa03c428	316	" PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n"
f9040773	317	" memory : 0x%16lx - 0x%16lx (%6ld MB)\n",
ee7f881b LW	318	#ifdef CONFIG_KASAN
	319	MLG(KASAN_SHADOW_START, KASAN_SHADOW_END),
	320	#endif
f9040773	321	MLM(MODULES_VADDR, MODULES_END),
08375198	322	MLG(VMALLOC_START, VMALLOC_END),
f9040773 AB	323	MLK_ROUNDUP(__init_begin, __init_end),
	324	MLK_ROUNDUP(_text, _etext),
	325	MLK_ROUNDUP(_sdata, _edata),
c1cc1552	326	#ifdef CONFIG_SPARSEMEM_VMEMMAP
08375198 CM	327	MLG((unsigned long)vmemmap,
08375198 CM	328	(unsigned long)vmemmap + VMEMMAP_SIZE),
c1cc1552 CM	329	MLM((unsigned long)virt_to_page(PAGE_OFFSET),
	330	(unsigned long)virt_to_page(high_memory)),
	331	#endif
08375198	332	MLK(FIXADDR_START, FIXADDR_TOP),
aa03c428	333	MLM(PCI_IO_START, PCI_IO_END),
f9040773	334	MLM(PAGE_OFFSET, (unsigned long)high_memory));
c1cc1552 CM	335
	336	#undef MLK
	337	#undef MLM
	338	#undef MLK_ROUNDUP
	339
	340	/*
	341	* Check boundaries twice: Some fundamental inconsistencies can be
	342	* detected at build time already.
	343	*/
	344	#ifdef CONFIG_COMPAT
	345	BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
	346	#endif
	347	BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
	348	BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
	349
bee4ebd1	350	if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
c1cc1552 CM	351	extern int sysctl_overcommit_memory;
	352	/*
	353	* On a machine this small we won't get anywhere without
	354	* overcommit, so turn it on by default.
	355	*/
	356	sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
	357	}
	358	}
	359
	360	void free_initmem(void)
	361	{
9af5b807	362	free_initmem_default(0);
f9040773	363	fixup_init();
c1cc1552 CM	364	}
	365
	366	#ifdef CONFIG_BLK_DEV_INITRD
	367
662ba3db	368	static int keep_initrd __initdata;
c1cc1552	369
662ba3db	370	void __init free_initrd_mem(unsigned long start, unsigned long end)
c1cc1552	371	{
0145058c	372	if (!keep_initrd)
9af5b807	373	free_reserved_area((void )start, (void )end, 0, "initrd");
c1cc1552 CM	374	}
	375
	376	static int __init keepinitrd_setup(char *__unused)
	377	{
	378	keep_initrd = 1;
	379	return 1;
	380	}
	381
	382	__setup("keepinitrd", keepinitrd_setup);
	383	#endif