[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/boot.h>
#include <asm/fixmap.h>
#include <asm/kasan.h>
#include <asm/kernel-pgtable.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"

/*
 * We need to be able to catch inadvertent references to memstart_addr
 * that occur (potentially in generic code) before arm64_memblock_init()
 * executes, which assigns it its actual value. So use a default value
 * that cannot be mistaken for a real physical address.
 */
s64 memstart_addr __read_mostly = -1;
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 = start;
		initrd_end = 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)
{
	const s64 linear_region_size = -(s64)PAGE_OFFSET;

	/*
	 * Ensure that the linear region takes up exactly half of the kernel
	 * virtual address space. This way, we can distinguish a linear address
	 * from a kernel/module/vmalloc address by testing a single bit.
	 */
	BUILD_BUG_ON(linear_region_size != BIT(VA_BITS - 1));

	/*
	 * Select a suitable value for the base of physical memory.
	 */
	memstart_addr = round_down(memblock_start_of_DRAM(),
				   ARM64_MEMSTART_ALIGN);

	/*
	 * Remove the memory that we will not be able to cover with the
	 * linear mapping. Take care not to clip the kernel which may be
	 * high in memory.
	 */
	memblock_remove(max_t(u64, memstart_addr + linear_region_size, __pa(_end)),
			ULLONG_MAX);
	if (memblock_end_of_DRAM() > linear_region_size)
		memblock_remove(0, memblock_end_of_DRAM() - linear_region_size);

	/*
	 * Apply the memory limit if it was set. Since the kernel may be loaded
	 * high up in memory, add back the kernel region that must be accessible
	 * via the linear mapping.
	 */
	if (memory_limit != (phys_addr_t)ULLONG_MAX) {
		memblock_enforce_memory_limit(memory_limit);
		memblock_add(__pa(_text), (u64)(_end - _text));
	}

	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
		extern u16 memstart_offset_seed;
		u64 range = linear_region_size -
			    (memblock_end_of_DRAM() - memblock_start_of_DRAM());

		/*
		 * If the size of the linear region exceeds, by a sufficient
		 * margin, the size of the region that the available physical
		 * memory spans, randomize the linear region as well.
		 */
		if (memstart_offset_seed > 0 && range >= ARM64_MEMSTART_ALIGN) {
			range = range / ARM64_MEMSTART_ALIGN + 1;
			memstart_addr -= ARM64_MEMSTART_ALIGN *
					 ((range * memstart_offset_seed) >> 16);
		}
	}

	/*
	 * 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(initrd_start, initrd_end - initrd_start);

		/* the generic initrd code expects virtual addresses */
		initrd_start = __phys_to_virt(initrd_start);
		initrd_end = __phys_to_virt(initrd_end);
	}
#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
	pr_cont("    kasan   : 0x%16lx - 0x%16lx   (%6ld GB)\n",
		MLG(KASAN_SHADOW_START, KASAN_SHADOW_END));
#endif
	pr_cont("    modules : 0x%16lx - 0x%16lx   (%6ld MB)\n",
		MLM(MODULES_VADDR, MODULES_END));
	pr_cont("    vmalloc : 0x%16lx - 0x%16lx   (%6ld GB)\n",
		MLG(VMALLOC_START, VMALLOC_END));
	pr_cont("      .text : 0x%p" " - 0x%p" "   (%6ld KB)\n"
		"    .rodata : 0x%p" " - 0x%p" "   (%6ld KB)\n"
		"      .init : 0x%p" " - 0x%p" "   (%6ld KB)\n"
		"      .data : 0x%p" " - 0x%p" "   (%6ld KB)\n",
		MLK_ROUNDUP(_text, __start_rodata),
		MLK_ROUNDUP(__start_rodata, _etext),
		MLK_ROUNDUP(__init_begin, __init_end),
		MLK_ROUNDUP(_sdata, _edata));
#ifdef CONFIG_SPARSEMEM_VMEMMAP
	pr_cont("    vmemmap : 0x%16lx - 0x%16lx   (%6ld GB maximum)\n"
		"              0x%16lx - 0x%16lx   (%6ld MB actual)\n",
		MLG(VMEMMAP_START,
		    VMEMMAP_START + VMEMMAP_SIZE),
		MLM((unsigned long)phys_to_page(memblock_start_of_DRAM()),
		    (unsigned long)virt_to_page(high_memory)));
#endif
	pr_cont("    fixed   : 0x%16lx - 0x%16lx   (%6ld KB)\n",
		MLK(FIXADDR_START, FIXADDR_TOP));
	pr_cont("    PCI I/O : 0x%16lx - 0x%16lx   (%6ld MB)\n",
		MLM(PCI_IO_START, PCI_IO_END));
	pr_cont("    memory  : 0x%16lx - 0x%16lx   (%6ld MB)\n",
		MLM(__phys_to_virt(memblock_start_of_DRAM()),
		    (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

	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

/*
 * Dump out memory limit information on panic.
 */
static int dump_mem_limit(struct notifier_block *self, unsigned long v, void *p)
{
	if (memory_limit != (phys_addr_t)ULLONG_MAX) {
		pr_emerg("Memory Limit: %llu MB\n", memory_limit >> 20);
	} else {
		pr_emerg("Memory Limit: none\n");
	}
	return 0;
}

static struct notifier_block mem_limit_notifier = {
	.notifier_call = dump_mem_limit,
};

static int __init register_mem_limit_dumper(void)
{
	atomic_notifier_chain_register(&panic_notifier_list,
				       &mem_limit_notifier);
	return 0;
}
__initcall(register_mem_limit_dumper);
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
a7f8de16	38	#include <asm/boot.h>
08375198	39	#include <asm/fixmap.h>
f9040773	40	#include <asm/kasan.h>
a7f8de16	41	#include <asm/kernel-pgtable.h>
aa03c428	42	#include <asm/memory.h>
c1cc1552 CM	43	#include <asm/sections.h>
	44	#include <asm/setup.h>
	45	#include <asm/sizes.h>
	46	#include <asm/tlb.h>
e039ee4e	47	#include <asm/alternative.h>
c1cc1552 CM	48
	49	#include "mm.h"
	50
a7f8de16 AB	51	/*
	52	* We need to be able to catch inadvertent references to memstart_addr
	53	* that occur (potentially in generic code) before arm64_memblock_init()
	54	* executes, which assigns it its actual value. So use a default value
	55	* that cannot be mistaken for a real physical address.
	56	*/
020d044f	57	s64 memstart_addr __read_mostly = -1;
a1e50a82	58	phys_addr_t arm64_dma_phys_limit __read_mostly;
c1cc1552	59
ec2eaa73	60	#ifdef CONFIG_BLK_DEV_INITRD
c1cc1552 CM	61	static int __init early_initrd(char *p)
	62	{
	63	unsigned long start, size;
	64	char *endp;
	65
	66	start = memparse(p, &endp);
	67	if (*endp == ',') {
	68	size = memparse(endp + 1, NULL);
	69
a89dea58 AB	70	initrd_start = start;
a89dea58 AB	71	initrd_end = start + size;
c1cc1552 CM	72	}
	73	return 0;
	74	}
	75	early_param("initrd", early_initrd);
ec2eaa73	76	#endif
c1cc1552	77
d50314a6 CM	78	/*
	79	* Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
	80	* currently assumes that for memory starting above 4G, 32-bit devices will
	81	* use a DMA offset.
	82	*/
a7c61a34	83	static phys_addr_t __init max_zone_dma_phys(void)
d50314a6 CM	84	{
	85	phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
	86	return min(offset + (1ULL << 32), memblock_end_of_DRAM());
	87	}
	88
c1cc1552 CM	89	static void __init zone_sizes_init(unsigned long min, unsigned long max)
	90	{
	91	struct memblock_region *reg;
	92	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
19e7640d	93	unsigned long max_dma = min;
c1cc1552 CM	94
	95	memset(zone_size, 0, sizeof(zone_size));
	96
c1cc1552	97	/* 4GB maximum for 32-bit only capable devices */
86a5906e RM	98	#ifdef CONFIG_ZONE_DMA
	99	max_dma = PFN_DOWN(arm64_dma_phys_limit);
	100	zone_size[ZONE_DMA] = max_dma - min;
	101	#endif
19e7640d	102	zone_size[ZONE_NORMAL] = max - max_dma;
c1cc1552 CM	103
	104	memcpy(zhole_size, zone_size, sizeof(zhole_size));
	105
	106	for_each_memblock(memory, reg) {
	107	unsigned long start = memblock_region_memory_base_pfn(reg);
	108	unsigned long end = memblock_region_memory_end_pfn(reg);
	109
	110	if (start >= max)
	111	continue;
19e7640d	112
86a5906e RM	113	#ifdef CONFIG_ZONE_DMA
86a5906e RM	114	if (start < max_dma) {
19e7640d CM	115	unsigned long dma_end = min(end, max_dma);
19e7640d CM	116	zhole_size[ZONE_DMA] -= dma_end - start;
c1cc1552	117	}
86a5906e	118	#endif
19e7640d	119	if (end > max_dma) {
c1cc1552	120	unsigned long normal_end = min(end, max);
19e7640d	121	unsigned long normal_start = max(start, max_dma);
c1cc1552 CM	122	zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
	123	}
	124	}
	125
	126	free_area_init_node(0, zone_size, min, zhole_size);
	127	}
	128
	129	#ifdef CONFIG_HAVE_ARCH_PFN_VALID
	130	int pfn_valid(unsigned long pfn)
	131	{
68709f45	132	return memblock_is_map_memory(pfn << PAGE_SHIFT);
c1cc1552 CM	133	}
	134	EXPORT_SYMBOL(pfn_valid);
	135	#endif
	136
	137	#ifndef CONFIG_SPARSEMEM
a7c61a34	138	static void __init arm64_memory_present(void)
c1cc1552 CM	139	{
	140	}
	141	#else
a7c61a34	142	static void __init arm64_memory_present(void)
c1cc1552 CM	143	{
	144	struct memblock_region *reg;
	145
	146	for_each_memblock(memory, reg)
	147	memory_present(0, memblock_region_memory_base_pfn(reg),
	148	memblock_region_memory_end_pfn(reg));
	149	}
	150	#endif
	151
6083fe74 MR	152	static phys_addr_t memory_limit = (phys_addr_t)ULLONG_MAX;
	153
	154	/*
	155	* Limit the memory size that was specified via FDT.
	156	*/
	157	static int __init early_mem(char *p)
	158	{
	159	if (!p)
	160	return 1;
	161
	162	memory_limit = memparse(p, &p) & PAGE_MASK;
	163	pr_notice("Memory limited to %lldMB\n", memory_limit >> 20);
	164
	165	return 0;
	166	}
	167	early_param("mem", early_mem);
	168
c1cc1552 CM	169	void __init arm64_memblock_init(void)
c1cc1552 CM	170	{
a7f8de16 AB	171	const s64 linear_region_size = -(s64)PAGE_OFFSET;
a7f8de16 AB	172
6d2aa549 AB	173	/*
	174	* Ensure that the linear region takes up exactly half of the kernel
	175	* virtual address space. This way, we can distinguish a linear address
	176	* from a kernel/module/vmalloc address by testing a single bit.
	177	*/
	178	BUILD_BUG_ON(linear_region_size != BIT(VA_BITS - 1));
	179
a7f8de16 AB	180	/*
	181	* Select a suitable value for the base of physical memory.
	182	*/
	183	memstart_addr = round_down(memblock_start_of_DRAM(),
	184	ARM64_MEMSTART_ALIGN);
	185
	186	/*
	187	* Remove the memory that we will not be able to cover with the
	188	* linear mapping. Take care not to clip the kernel which may be
	189	* high in memory.
	190	*/
020d044f	191	memblock_remove(max_t(u64, memstart_addr + linear_region_size, __pa(_end)),
a7f8de16 AB	192	ULLONG_MAX);
	193	if (memblock_end_of_DRAM() > linear_region_size)
	194	memblock_remove(0, memblock_end_of_DRAM() - linear_region_size);
	195
	196	/*
	197	* Apply the memory limit if it was set. Since the kernel may be loaded
	198	* high up in memory, add back the kernel region that must be accessible
	199	* via the linear mapping.
	200	*/
	201	if (memory_limit != (phys_addr_t)ULLONG_MAX) {
	202	memblock_enforce_memory_limit(memory_limit);
	203	memblock_add(__pa(_text), (u64)(_end - _text));
	204	}
6083fe74	205
c031a421 AB	206	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
	207	extern u16 memstart_offset_seed;
	208	u64 range = linear_region_size -
	209	(memblock_end_of_DRAM() - memblock_start_of_DRAM());
	210
	211	/*
	212	* If the size of the linear region exceeds, by a sufficient
	213	* margin, the size of the region that the available physical
	214	* memory spans, randomize the linear region as well.
	215	*/
	216	if (memstart_offset_seed > 0 && range >= ARM64_MEMSTART_ALIGN) {
	217	range = range / ARM64_MEMSTART_ALIGN + 1;
	218	memstart_addr -= ARM64_MEMSTART_ALIGN *
	219	((range * memstart_offset_seed) >> 16);
	220	}
	221	}
6083fe74	222
bd00cd5f MR	223	/*
	224	* Register the kernel text, kernel data, initrd, and initial
	225	* pagetables with memblock.
	226	*/
c1cc1552 CM	227	memblock_reserve(__pa(_text), _end - _text);
c1cc1552 CM	228	#ifdef CONFIG_BLK_DEV_INITRD
a89dea58 AB	229	if (initrd_start) {
	230	memblock_reserve(initrd_start, initrd_end - initrd_start);
	231
	232	/* the generic initrd code expects virtual addresses */
	233	initrd_start = __phys_to_virt(initrd_start);
	234	initrd_end = __phys_to_virt(initrd_end);
	235	}
c1cc1552 CM	236	#endif
c1cc1552 CM	237
0ceac9e0	238	early_init_fdt_scan_reserved_mem();
2d5a5612 CM	239
	240	/* 4GB maximum for 32-bit only capable devices */
	241	if (IS_ENABLED(CONFIG_ZONE_DMA))
a1e50a82 CM	242	arm64_dma_phys_limit = max_zone_dma_phys();
	243	else
	244	arm64_dma_phys_limit = PHYS_MASK + 1;
	245	dma_contiguous_reserve(arm64_dma_phys_limit);
6ac2104d	246
c1cc1552 CM	247	memblock_allow_resize();
	248	memblock_dump_all();
	249	}
	250
	251	void __init bootmem_init(void)
	252	{
	253	unsigned long min, max;
	254
	255	min = PFN_UP(memblock_start_of_DRAM());
	256	max = PFN_DOWN(memblock_end_of_DRAM());
	257
36dd9086 VM	258	early_memtest(min << PAGE_SHIFT, max << PAGE_SHIFT);
36dd9086 VM	259
c1cc1552 CM	260	/*
	261	* Sparsemem tries to allocate bootmem in memory_present(), so must be
	262	* done after the fixed reservations.
	263	*/
	264	arm64_memory_present();
	265
	266	sparse_init();
	267	zone_sizes_init(min, max);
	268
	269	high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
	270	max_pfn = max_low_pfn = max;
	271	}
	272
c1cc1552 CM	273	#ifndef CONFIG_SPARSEMEM_VMEMMAP
	274	static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
	275	{
	276	struct page start_pg, end_pg;
	277	unsigned long pg, pgend;
	278
	279	/*
	280	* Convert start_pfn/end_pfn to a struct page pointer.
	281	*/
	282	start_pg = pfn_to_page(start_pfn - 1) + 1;
	283	end_pg = pfn_to_page(end_pfn - 1) + 1;
	284
	285	/*
	286	* Convert to physical addresses, and round start upwards and end
	287	* downwards.
	288	*/
	289	pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
	290	pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
	291
	292	/*
	293	* If there are free pages between these, free the section of the
	294	* memmap array.
	295	*/
	296	if (pg < pgend)
	297	free_bootmem(pg, pgend - pg);
	298	}
	299
	300	/*
	301	* The mem_map array can get very big. Free the unused area of the memory map.
	302	*/
	303	static void __init free_unused_memmap(void)
	304	{
	305	unsigned long start, prev_end = 0;
	306	struct memblock_region *reg;
	307
	308	for_each_memblock(memory, reg) {
	309	start = __phys_to_pfn(reg->base);
	310
	311	#ifdef CONFIG_SPARSEMEM
	312	/*
	313	* Take care not to free memmap entries that don't exist due
	314	* to SPARSEMEM sections which aren't present.
	315	*/
	316	start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
	317	#endif
	318	/*
	319	* If we had a previous bank, and there is a space between the
	320	* current bank and the previous, free it.
	321	*/
	322	if (prev_end && prev_end < start)
	323	free_memmap(prev_end, start);
	324
	325	/*
	326	* Align up here since the VM subsystem insists that the
	327	* memmap entries are valid from the bank end aligned to
	328	* MAX_ORDER_NR_PAGES.
	329	*/
b9bcc919	330	prev_end = ALIGN(__phys_to_pfn(reg->base + reg->size),
c1cc1552 CM	331	MAX_ORDER_NR_PAGES);
	332	}
	333
	334	#ifdef CONFIG_SPARSEMEM
	335	if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
	336	free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
	337	#endif
	338	}
	339	#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
	340
	341	/*
	342	* mem_init() marks the free areas in the mem_map and tells us how much memory
	343	* is free. This is done after various parts of the system have claimed their
	344	* memory after the kernel image.
	345	*/
	346	void __init mem_init(void)
	347	{
a1e50a82 CM	348	swiotlb_init(1);
a1e50a82 CM	349
a6583c7c	350	set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
c1cc1552 CM	351
c1cc1552 CM	352	#ifndef CONFIG_SPARSEMEM_VMEMMAP
c1cc1552 CM	353	free_unused_memmap();
c1cc1552 CM	354	#endif
bee4ebd1	355	/* this will put all unused low memory onto the freelists */
0c988534	356	free_all_bootmem();
c1cc1552	357
6879ea83	358	mem_init_print_info(NULL);
c1cc1552 CM	359
	360	#define MLK(b, t) b, t, ((t) - (b)) >> 10
	361	#define MLM(b, t) b, t, ((t) - (b)) >> 20
08375198	362	#define MLG(b, t) b, t, ((t) - (b)) >> 30
c1cc1552 CM	363	#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
c1cc1552 CM	364
f09f1bac	365	pr_notice("Virtual kernel memory layout:\n");
ee7f881b	366	#ifdef CONFIG_KASAN
f09f1bac CM	367	pr_cont(" kasan : 0x%16lx - 0x%16lx (%6ld GB)\n",
f09f1bac CM	368	MLG(KASAN_SHADOW_START, KASAN_SHADOW_END));
ee7f881b	369	#endif
f09f1bac CM	370	pr_cont(" modules : 0x%16lx - 0x%16lx (%6ld MB)\n",
	371	MLM(MODULES_VADDR, MODULES_END));
	372	pr_cont(" vmalloc : 0x%16lx - 0x%16lx (%6ld GB)\n",
	373	MLG(VMALLOC_START, VMALLOC_END));
	374	pr_cont(" .text : 0x%p" " - 0x%p" " (%6ld KB)\n"
	375	" .rodata : 0x%p" " - 0x%p" " (%6ld KB)\n"
	376	" .init : 0x%p" " - 0x%p" " (%6ld KB)\n"
	377	" .data : 0x%p" " - 0x%p" " (%6ld KB)\n",
	378	MLK_ROUNDUP(_text, __start_rodata),
	379	MLK_ROUNDUP(__start_rodata, _etext),
	380	MLK_ROUNDUP(__init_begin, __init_end),
	381	MLK_ROUNDUP(_sdata, _edata));
c1cc1552	382	#ifdef CONFIG_SPARSEMEM_VMEMMAP
f09f1bac CM	383	pr_cont(" vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n"
f09f1bac CM	384	" 0x%16lx - 0x%16lx (%6ld MB actual)\n",
9d854607 LT	385	MLG(VMEMMAP_START,
9d854607 LT	386	VMEMMAP_START + VMEMMAP_SIZE),
f09f1bac CM	387	MLM((unsigned long)phys_to_page(memblock_start_of_DRAM()),
f09f1bac CM	388	(unsigned long)virt_to_page(high_memory)));
c1cc1552	389	#endif
f09f1bac CM	390	pr_cont(" fixed : 0x%16lx - 0x%16lx (%6ld KB)\n",
	391	MLK(FIXADDR_START, FIXADDR_TOP));
	392	pr_cont(" PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n",
	393	MLM(PCI_IO_START, PCI_IO_END));
	394	pr_cont(" memory : 0x%16lx - 0x%16lx (%6ld MB)\n",
	395	MLM(__phys_to_virt(memblock_start_of_DRAM()),
	396	(unsigned long)high_memory));
c1cc1552 CM	397
	398	#undef MLK
	399	#undef MLM
	400	#undef MLK_ROUNDUP
	401
	402	/*
	403	* Check boundaries twice: Some fundamental inconsistencies can be
	404	* detected at build time already.
	405	*/
	406	#ifdef CONFIG_COMPAT
	407	BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
	408	#endif
c1cc1552	409
bee4ebd1	410	if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
c1cc1552 CM	411	extern int sysctl_overcommit_memory;
	412	/*
	413	* On a machine this small we won't get anywhere without
	414	* overcommit, so turn it on by default.
	415	*/
	416	sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
	417	}
	418	}
	419
	420	void free_initmem(void)
	421	{
9af5b807	422	free_initmem_default(0);
f9040773	423	fixup_init();
c1cc1552 CM	424	}
	425
	426	#ifdef CONFIG_BLK_DEV_INITRD
	427
662ba3db	428	static int keep_initrd __initdata;
c1cc1552	429
662ba3db	430	void __init free_initrd_mem(unsigned long start, unsigned long end)
c1cc1552	431	{
0145058c	432	if (!keep_initrd)
9af5b807	433	free_reserved_area((void )start, (void )end, 0, "initrd");
c1cc1552 CM	434	}
	435
	436	static int __init keepinitrd_setup(char *__unused)
	437	{
	438	keep_initrd = 1;
	439	return 1;
	440	}
	441
	442	__setup("keepinitrd", keepinitrd_setup);
	443	#endif
a7f8de16 AB	444
	445	/*
	446	* Dump out memory limit information on panic.
	447	*/
	448	static int dump_mem_limit(struct notifier_block self, unsigned long v, void p)
	449	{
	450	if (memory_limit != (phys_addr_t)ULLONG_MAX) {
	451	pr_emerg("Memory Limit: %llu MB\n", memory_limit >> 20);
	452	} else {
	453	pr_emerg("Memory Limit: none\n");
	454	}
	455	return 0;
	456	}
	457
	458	static struct notifier_block mem_limit_notifier = {
	459	.notifier_call = dump_mem_limit,
	460	};
	461
	462	static int __init register_mem_limit_dumper(void)
	463	{
	464	atomic_notifier_chain_register(&panic_notifier_list,
	465	&mem_limit_notifier);
	466	return 0;
	467	}
	468	__initcall(register_mem_limit_dumper);