[linux-2.6-block.git] / arch / arm64 / include / asm / memory.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Based on arch/arm/include/asm/memory.h
 *
 * Copyright (C) 2000-2002 Russell King
 * Copyright (C) 2012 ARM Ltd.
 *
 * Note: this file should not be included by non-asm/.h files
 */
#ifndef __ASM_MEMORY_H
#define __ASM_MEMORY_H

#include <linux/compiler.h>
#include <linux/const.h>
#include <linux/types.h>
#include <asm/bug.h>
#include <asm/page-def.h>
#include <linux/sizes.h>

/*
 * Size of the PCI I/O space. This must remain a power of two so that
 * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses.
 */
#define PCI_IO_SIZE		SZ_16M

/*
 * VMEMMAP_SIZE - allows the whole linear region to be covered by
 *                a struct page array
 */
#define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT))

/*
 * PAGE_OFFSET - the virtual address of the start of the linear map (top
 *		 (VA_BITS - 1))
 * KIMAGE_VADDR - the virtual address of the start of the kernel image
 * VA_BITS - the maximum number of bits for virtual addresses.
 * VA_START - the first kernel virtual address.
 */
#define VA_BITS			(CONFIG_ARM64_VA_BITS)
#define VA_START		(UL(0xffffffffffffffff) - \
	(UL(1) << VA_BITS) + 1)
#define PAGE_OFFSET		(UL(0xffffffffffffffff) - \
	(UL(1) << (VA_BITS - 1)) + 1)
#define KIMAGE_VADDR		(MODULES_END)
#define BPF_JIT_REGION_START	(VA_START + KASAN_SHADOW_SIZE)
#define BPF_JIT_REGION_SIZE	(SZ_128M)
#define BPF_JIT_REGION_END	(BPF_JIT_REGION_START + BPF_JIT_REGION_SIZE)
#define MODULES_END		(MODULES_VADDR + MODULES_VSIZE)
#define MODULES_VADDR		(BPF_JIT_REGION_END)
#define MODULES_VSIZE		(SZ_128M)
#define VMEMMAP_START		(PAGE_OFFSET - VMEMMAP_SIZE)
#define PCI_IO_END		(VMEMMAP_START - SZ_2M)
#define PCI_IO_START		(PCI_IO_END - PCI_IO_SIZE)
#define FIXADDR_TOP		(PCI_IO_START - SZ_2M)

#define KERNEL_START      _text
#define KERNEL_END        _end

#ifdef CONFIG_ARM64_USER_VA_BITS_52
#define MAX_USER_VA_BITS	52
#else
#define MAX_USER_VA_BITS	VA_BITS
#endif

/*
 * Generic and tag-based KASAN require 1/8th and 1/16th of the kernel virtual
 * address space for the shadow region respectively. They can bloat the stack
 * significantly, so double the (minimum) stack size when they are in use.
 */
#ifdef CONFIG_KASAN
#define KASAN_SHADOW_SIZE	(UL(1) << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
#define KASAN_THREAD_SHIFT	1
#else
#define KASAN_SHADOW_SIZE	(0)
#define KASAN_THREAD_SHIFT	0
#endif

#define MIN_THREAD_SHIFT	(14 + KASAN_THREAD_SHIFT)

/*
 * VMAP'd stacks are allocated at page granularity, so we must ensure that such
 * stacks are a multiple of page size.
 */
#if defined(CONFIG_VMAP_STACK) && (MIN_THREAD_SHIFT < PAGE_SHIFT)
#define THREAD_SHIFT		PAGE_SHIFT
#else
#define THREAD_SHIFT		MIN_THREAD_SHIFT
#endif

#if THREAD_SHIFT >= PAGE_SHIFT
#define THREAD_SIZE_ORDER	(THREAD_SHIFT - PAGE_SHIFT)
#endif

#define THREAD_SIZE		(UL(1) << THREAD_SHIFT)

/*
 * By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by
 * checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry
 * assembly.
 */
#ifdef CONFIG_VMAP_STACK
#define THREAD_ALIGN		(2 * THREAD_SIZE)
#else
#define THREAD_ALIGN		THREAD_SIZE
#endif

#define IRQ_STACK_SIZE		THREAD_SIZE

#define OVERFLOW_STACK_SIZE	SZ_4K

/*
 * Alignment of kernel segments (e.g. .text, .data).
 */
#if defined(CONFIG_DEBUG_ALIGN_RODATA)
/*
 *  4 KB granule:   1 level 2 entry
 * 16 KB granule: 128 level 3 entries, with contiguous bit
 * 64 KB granule:  32 level 3 entries, with contiguous bit
 */
#define SEGMENT_ALIGN			SZ_2M
#else
/*
 *  4 KB granule:  16 level 3 entries, with contiguous bit
 * 16 KB granule:   4 level 3 entries, without contiguous bit
 * 64 KB granule:   1 level 3 entry
 */
#define SEGMENT_ALIGN			SZ_64K
#endif

/*
 * Memory types available.
 */
#define MT_DEVICE_nGnRnE	0
#define MT_DEVICE_nGnRE		1
#define MT_DEVICE_GRE		2
#define MT_NORMAL_NC		3
#define MT_NORMAL		4
#define MT_NORMAL_WT		5

/*
 * Memory types for Stage-2 translation
 */
#define MT_S2_NORMAL		0xf
#define MT_S2_DEVICE_nGnRE	0x1

/*
 * Memory types for Stage-2 translation when ID_AA64MMFR2_EL1.FWB is 0001
 * Stage-2 enforces Normal-WB and Device-nGnRE
 */
#define MT_S2_FWB_NORMAL	6
#define MT_S2_FWB_DEVICE_nGnRE	1

#ifdef CONFIG_ARM64_4K_PAGES
#define IOREMAP_MAX_ORDER	(PUD_SHIFT)
#else
#define IOREMAP_MAX_ORDER	(PMD_SHIFT)
#endif

#ifndef __ASSEMBLY__

#include <linux/bitops.h>
#include <linux/mmdebug.h>

extern s64			memstart_addr;
/* PHYS_OFFSET - the physical address of the start of memory. */
#define PHYS_OFFSET		({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })

/* the virtual base of the kernel image (minus TEXT_OFFSET) */
extern u64			kimage_vaddr;

/* the offset between the kernel virtual and physical mappings */
extern u64			kimage_voffset;

static inline unsigned long kaslr_offset(void)
{
	return kimage_vaddr - KIMAGE_VADDR;
}

/* the actual size of a user virtual address */
extern u64			vabits_user;

/*
 * Allow all memory at the discovery stage. We will clip it later.
 */
#define MIN_MEMBLOCK_ADDR	0
#define MAX_MEMBLOCK_ADDR	U64_MAX

/*
 * PFNs are used to describe any physical page; this means
 * PFN 0 == physical address 0.
 *
 * This is the PFN of the first RAM page in the kernel
 * direct-mapped view.  We assume this is the first page
 * of RAM in the mem_map as well.
 */
#define PHYS_PFN_OFFSET	(PHYS_OFFSET >> PAGE_SHIFT)

/*
 * When dealing with data aborts, watchpoints, or instruction traps we may end
 * up with a tagged userland pointer. Clear the tag to get a sane pointer to
 * pass on to access_ok(), for instance.
 */
#define untagged_addr(addr)	\
	((__typeof__(addr))sign_extend64((u64)(addr), 55))

#ifdef CONFIG_KASAN_SW_TAGS
#define __tag_shifted(tag)	((u64)(tag) << 56)
#define __tag_set(addr, tag)	(__typeof__(addr))( \
		((u64)(addr) & ~__tag_shifted(0xff)) | __tag_shifted(tag))
#define __tag_reset(addr)	untagged_addr(addr)
#define __tag_get(addr)		(__u8)((u64)(addr) >> 56)
#else
static inline const void *__tag_set(const void *addr, u8 tag)
{
	return addr;
}

#define __tag_reset(addr)	(addr)
#define __tag_get(addr)		0
#endif

/*
 * Physical vs virtual RAM address space conversion.  These are
 * private definitions which should NOT be used outside memory.h
 * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
 */


/*
 * The linear kernel range starts in the middle of the virtual adddress
 * space. Testing the top bit for the start of the region is a
 * sufficient check.
 */
#define __is_lm_address(addr)	(!!((addr) & BIT(VA_BITS - 1)))

#define __lm_to_phys(addr)	(((addr) & ~PAGE_OFFSET) + PHYS_OFFSET)
#define __kimg_to_phys(addr)	((addr) - kimage_voffset)

#define __virt_to_phys_nodebug(x) ({					\
	phys_addr_t __x = (phys_addr_t)(x);				\
	__is_lm_address(__x) ? __lm_to_phys(__x) :			\
			       __kimg_to_phys(__x);			\
})

#define __pa_symbol_nodebug(x)	__kimg_to_phys((phys_addr_t)(x))

#ifdef CONFIG_DEBUG_VIRTUAL
extern phys_addr_t __virt_to_phys(unsigned long x);
extern phys_addr_t __phys_addr_symbol(unsigned long x);
#else
#define __virt_to_phys(x)	__virt_to_phys_nodebug(x)
#define __phys_addr_symbol(x)	__pa_symbol_nodebug(x)
#endif

#define __phys_to_virt(x)	((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)
#define __phys_to_kimg(x)	((unsigned long)((x) + kimage_voffset))

/*
 * Convert a page to/from a physical address
 */
#define page_to_phys(page)	(__pfn_to_phys(page_to_pfn(page)))
#define phys_to_page(phys)	(pfn_to_page(__phys_to_pfn(phys)))

/*
 * Note: Drivers should NOT use these.  They are the wrong
 * translation for translating DMA addresses.  Use the driver
 * DMA support - see dma-mapping.h.
 */
#define virt_to_phys virt_to_phys
static inline phys_addr_t virt_to_phys(const volatile void *x)
{
	return __virt_to_phys((unsigned long)(x));
}

#define phys_to_virt phys_to_virt
static inline void *phys_to_virt(phys_addr_t x)
{
	return (void *)(__phys_to_virt(x));
}

/*
 * Drivers should NOT use these either.
 */
#define __pa(x)			__virt_to_phys((unsigned long)(x))
#define __pa_symbol(x)		__phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
#define __pa_nodebug(x)		__virt_to_phys_nodebug((unsigned long)(x))
#define __va(x)			((void *)__phys_to_virt((phys_addr_t)(x)))
#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
#define virt_to_pfn(x)      __phys_to_pfn(__virt_to_phys((unsigned long)(x)))
#define sym_to_pfn(x)	    __phys_to_pfn(__pa_symbol(x))

/*
 *  virt_to_page(k)	convert a _valid_ virtual address to struct page *
 *  virt_addr_valid(k)	indicates whether a virtual address is valid
 */
#define ARCH_PFN_OFFSET		((unsigned long)PHYS_PFN_OFFSET)

#if !defined(CONFIG_SPARSEMEM_VMEMMAP) || defined(CONFIG_DEBUG_VIRTUAL)
#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define _virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
#else
#define __virt_to_pgoff(kaddr)	(((u64)(kaddr) - PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page))
#define __page_to_voff(kaddr)	(((u64)(kaddr) - VMEMMAP_START) * PAGE_SIZE / sizeof(struct page))

#define page_to_virt(page)	({					\
	unsigned long __addr =						\
		((__page_to_voff(page)) + PAGE_OFFSET);			\
	const void *__addr_tag =					\
		__tag_set((void *)__addr, page_kasan_tag(page));	\
	((void *)__addr_tag);						\
})

#define virt_to_page(vaddr)	((struct page *)((__virt_to_pgoff(vaddr)) + VMEMMAP_START))

#define _virt_addr_valid(kaddr)	pfn_valid(__virt_to_phys((u64)(kaddr)) >> PAGE_SHIFT)
#endif
#endif

#define _virt_addr_is_linear(kaddr)	\
	(__tag_reset((u64)(kaddr)) >= PAGE_OFFSET)
#define virt_addr_valid(kaddr)		\
	(_virt_addr_is_linear(kaddr) && _virt_addr_valid(kaddr))

/*
 * Given that the GIC architecture permits ITS implementations that can only be
 * configured with a LPI table address once, GICv3 systems with many CPUs may
 * end up reserving a lot of different regions after a kexec for their LPI
 * tables (one per CPU), as we are forced to reuse the same memory after kexec
 * (and thus reserve it persistently with EFI beforehand)
 */
#if defined(CONFIG_EFI) && defined(CONFIG_ARM_GIC_V3_ITS)
# define INIT_MEMBLOCK_RESERVED_REGIONS	(INIT_MEMBLOCK_REGIONS + NR_CPUS + 1)
#endif

#include <asm-generic/memory_model.h>

#endif
Commit	Line	Data
caab277b	1	/* SPDX-License-Identifier: GPL-2.0-only */
4f04d8f0 CM	2	/*
	3	* Based on arch/arm/include/asm/memory.h
	4	*
	5	* Copyright (C) 2000-2002 Russell King
	6	* Copyright (C) 2012 ARM Ltd.
	7	*
4f04d8f0 CM	8	* Note: this file should not be included by non-asm/.h files
	9	*/
	10	#ifndef __ASM_MEMORY_H
	11	#define __ASM_MEMORY_H
	12
	13	#include <linux/compiler.h>
	14	#include <linux/const.h>
	15	#include <linux/types.h>
a7f8de16	16	#include <asm/bug.h>
b6531456	17	#include <asm/page-def.h>
87dfb311	18	#include <linux/sizes.h>
4f04d8f0	19
aa03c428 MR	20	/*
	21	* Size of the PCI I/O space. This must remain a power of two so that
	22	* IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses.
	23	*/
	24	#define PCI_IO_SIZE SZ_16M
	25
3e1907d5 AB	26	/*
	27	* VMEMMAP_SIZE - allows the whole linear region to be covered by
	28	* a struct page array
	29	*/
	30	#define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT))
	31
4f04d8f0	32	/*
a13e3a5b	33	* PAGE_OFFSET - the virtual address of the start of the linear map (top
847264fb	34	* (VA_BITS - 1))
a13e3a5b	35	* KIMAGE_VADDR - the virtual address of the start of the kernel image
4f04d8f0	36	* VA_BITS - the maximum number of bits for virtual addresses.
127db024	37	* VA_START - the first kernel virtual address.
4f04d8f0	38	*/
e41ceed0	39	#define VA_BITS (CONFIG_ARM64_VA_BITS)
82cd5880 ND	40	#define VA_START (UL(0xffffffffffffffff) - \
	41	(UL(1) << VA_BITS) + 1)
	42	#define PAGE_OFFSET (UL(0xffffffffffffffff) - \
	43	(UL(1) << (VA_BITS - 1)) + 1)
f9040773	44	#define KIMAGE_VADDR (MODULES_END)
91fc957c AB	45	#define BPF_JIT_REGION_START (VA_START + KASAN_SHADOW_SIZE)
	46	#define BPF_JIT_REGION_SIZE (SZ_128M)
	47	#define BPF_JIT_REGION_END (BPF_JIT_REGION_START + BPF_JIT_REGION_SIZE)
f9040773	48	#define MODULES_END (MODULES_VADDR + MODULES_VSIZE)
91fc957c	49	#define MODULES_VADDR (BPF_JIT_REGION_END)
f80fb3a3	50	#define MODULES_VSIZE (SZ_128M)
3e1907d5 AB	51	#define VMEMMAP_START (PAGE_OFFSET - VMEMMAP_SIZE)
3e1907d5 AB	52	#define PCI_IO_END (VMEMMAP_START - SZ_2M)
aa03c428 MR	53	#define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE)
aa03c428 MR	54	#define FIXADDR_TOP (PCI_IO_START - SZ_2M)
4f04d8f0	55
28c72583 JM	56	#define KERNEL_START _text
	57	#define KERNEL_END _end
	58
9b31cf49 WD	59	#ifdef CONFIG_ARM64_USER_VA_BITS_52
	60	#define MAX_USER_VA_BITS 52
	61	#else
	62	#define MAX_USER_VA_BITS VA_BITS
	63	#endif
	64
f9040773	65	/*
b2f557ea AK	66	* Generic and tag-based KASAN require 1/8th and 1/16th of the kernel virtual
	67	* address space for the shadow region respectively. They can bloat the stack
	68	* significantly, so double the (minimum) stack size when they are in use.
f9040773 AB	69	*/
f9040773 AB	70	#ifdef CONFIG_KASAN
917538e2	71	#define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
b02faed1	72	#define KASAN_THREAD_SHIFT 1
f9040773 AB	73	#else
f9040773 AB	74	#define KASAN_SHADOW_SIZE (0)
b02faed1	75	#define KASAN_THREAD_SHIFT 0
f9040773 AB	76	#endif
f9040773 AB	77
b02faed1	78	#define MIN_THREAD_SHIFT (14 + KASAN_THREAD_SHIFT)
e3067861 MR	79
	80	/*
	81	* VMAP'd stacks are allocated at page granularity, so we must ensure that such
	82	* stacks are a multiple of page size.
	83	*/
	84	#if defined(CONFIG_VMAP_STACK) && (MIN_THREAD_SHIFT < PAGE_SHIFT)
	85	#define THREAD_SHIFT PAGE_SHIFT
	86	#else
	87	#define THREAD_SHIFT MIN_THREAD_SHIFT
	88	#endif
dbc9344a MR	89
	90	#if THREAD_SHIFT >= PAGE_SHIFT
	91	#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
	92	#endif
	93
	94	#define THREAD_SIZE (UL(1) << THREAD_SHIFT)
	95
e3067861 MR	96	/*
	97	* By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by
	98	* checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry
	99	* assembly.
	100	*/
	101	#ifdef CONFIG_VMAP_STACK
	102	#define THREAD_ALIGN (2 * THREAD_SIZE)
	103	#else
	104	#define THREAD_ALIGN THREAD_SIZE
	105	#endif
	106
f60ad4ed MR	107	#define IRQ_STACK_SIZE THREAD_SIZE
f60ad4ed MR	108
872d8327 MR	109	#define OVERFLOW_STACK_SIZE SZ_4K
872d8327 MR	110
8018ba4e MR	111	/*
	112	* Alignment of kernel segments (e.g. .text, .data).
	113	*/
	114	#if defined(CONFIG_DEBUG_ALIGN_RODATA)
	115	/*
	116	* 4 KB granule: 1 level 2 entry
	117	* 16 KB granule: 128 level 3 entries, with contiguous bit
	118	* 64 KB granule: 32 level 3 entries, with contiguous bit
	119	*/
	120	#define SEGMENT_ALIGN SZ_2M
	121	#else
	122	/*
	123	* 4 KB granule: 16 level 3 entries, with contiguous bit
	124	* 16 KB granule: 4 level 3 entries, without contiguous bit
	125	* 64 KB granule: 1 level 3 entry
	126	*/
	127	#define SEGMENT_ALIGN SZ_64K
	128	#endif
	129
4f04d8f0 CM	130	/*
	131	* Memory types available.
	132	*/
	133	#define MT_DEVICE_nGnRnE 0
	134	#define MT_DEVICE_nGnRE 1
	135	#define MT_DEVICE_GRE 2
	136	#define MT_NORMAL_NC 3
	137	#define MT_NORMAL 4
8d446c86	138	#define MT_NORMAL_WT 5
4f04d8f0	139
36311607 MZ	140	/*
	141	* Memory types for Stage-2 translation
	142	*/
	143	#define MT_S2_NORMAL 0xf
	144	#define MT_S2_DEVICE_nGnRE 0x1
	145
e48d53a9 MZ	146	/*
	147	* Memory types for Stage-2 translation when ID_AA64MMFR2_EL1.FWB is 0001
	148	* Stage-2 enforces Normal-WB and Device-nGnRE
	149	*/
	150	#define MT_S2_FWB_NORMAL 6
	151	#define MT_S2_FWB_DEVICE_nGnRE 1
	152
324420bf AB	153	#ifdef CONFIG_ARM64_4K_PAGES
	154	#define IOREMAP_MAX_ORDER (PUD_SHIFT)
	155	#else
	156	#define IOREMAP_MAX_ORDER (PMD_SHIFT)
	157	#endif
	158
4f04d8f0 CM	159	#ifndef __ASSEMBLY__
4f04d8f0 CM	160
8439e62a	161	#include <linux/bitops.h>
a92405f0 AB	162	#include <linux/mmdebug.h>
a92405f0 AB	163
020d044f	164	extern s64 memstart_addr;
4f04d8f0	165	/* PHYS_OFFSET - the physical address of the start of memory. */
a92405f0	166	#define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
a7f8de16	167
f80fb3a3 AB	168	/* the virtual base of the kernel image (minus TEXT_OFFSET) */
	169	extern u64 kimage_vaddr;
	170
a7f8de16 AB	171	/* the offset between the kernel virtual and physical mappings */
a7f8de16 AB	172	extern u64 kimage_voffset;
4f04d8f0	173
7ede8665 AP	174	static inline unsigned long kaslr_offset(void)
	175	{
	176	return kimage_vaddr - KIMAGE_VADDR;
	177	}
	178
ec6e822d MR	179	/* the actual size of a user virtual address */
	180	extern u64 vabits_user;
	181
34ba2c42	182	/*
a7f8de16	183	* Allow all memory at the discovery stage. We will clip it later.
34ba2c42	184	*/
a7f8de16 AB	185	#define MIN_MEMBLOCK_ADDR 0
a7f8de16 AB	186	#define MAX_MEMBLOCK_ADDR U64_MAX
34ba2c42	187
4f04d8f0 CM	188	/*
	189	* PFNs are used to describe any physical page; this means
	190	* PFN 0 == physical address 0.
	191	*
	192	* This is the PFN of the first RAM page in the kernel
	193	* direct-mapped view. We assume this is the first page
	194	* of RAM in the mem_map as well.
	195	*/
	196	#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
	197
9c23f847 AK	198	/*
	199	* When dealing with data aborts, watchpoints, or instruction traps we may end
	200	* up with a tagged userland pointer. Clear the tag to get a sane pointer to
	201	* pass on to access_ok(), for instance.
	202	*/
	203	#define untagged_addr(addr) \
	204	((__typeof__(addr))sign_extend64((u64)(addr), 55))
	205
3c9e3aa1 AK	206	#ifdef CONFIG_KASAN_SW_TAGS
	207	#define __tag_shifted(tag) ((u64)(tag) << 56)
	208	#define __tag_set(addr, tag) (__typeof__(addr))( \
	209	((u64)(addr) & ~__tag_shifted(0xff)) \| __tag_shifted(tag))
	210	#define __tag_reset(addr) untagged_addr(addr)
	211	#define __tag_get(addr) (__u8)((u64)(addr) >> 56)
	212	#else
7732d20a QC	213	static inline const void __tag_set(const void addr, u8 tag)
	214	{
	215	return addr;
	216	}
	217
3c9e3aa1 AK	218	#define __tag_reset(addr) (addr)
	219	#define __tag_get(addr) 0
	220	#endif
	221
9e22eb61 LA	222	/*
	223	* Physical vs virtual RAM address space conversion. These are
	224	* private definitions which should NOT be used outside memory.h
	225	* files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
	226	*/
ec6d06ef LA	227
	228
	229	/*
	230	* The linear kernel range starts in the middle of the virtual adddress
	231	* space. Testing the top bit for the start of the region is a
	232	* sufficient check.
	233	*/
	234	#define __is_lm_address(addr) (!!((addr) & BIT(VA_BITS - 1)))
	235
	236	#define __lm_to_phys(addr) (((addr) & ~PAGE_OFFSET) + PHYS_OFFSET)
	237	#define __kimg_to_phys(addr) ((addr) - kimage_voffset)
	238
	239	#define __virt_to_phys_nodebug(x) ({ \
9e22eb61	240	phys_addr_t __x = (phys_addr_t)(x); \
ec6d06ef LA	241	__is_lm_address(__x) ? __lm_to_phys(__x) : \
	242	__kimg_to_phys(__x); \
	243	})
	244
	245	#define __pa_symbol_nodebug(x) __kimg_to_phys((phys_addr_t)(x))
	246
	247	#ifdef CONFIG_DEBUG_VIRTUAL
	248	extern phys_addr_t __virt_to_phys(unsigned long x);
	249	extern phys_addr_t __phys_addr_symbol(unsigned long x);
	250	#else
	251	#define __virt_to_phys(x) __virt_to_phys_nodebug(x)
	252	#define __phys_addr_symbol(x) __pa_symbol_nodebug(x)
	253	#endif
9e22eb61 LA	254
	255	#define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) \| PAGE_OFFSET)
	256	#define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset))
	257
	258	/*
	259	* Convert a page to/from a physical address
	260	*/
	261	#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
	262	#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
	263
4f04d8f0 CM	264	/*
	265	* Note: Drivers should NOT use these. They are the wrong
	266	* translation for translating DMA addresses. Use the driver
	267	* DMA support - see dma-mapping.h.
	268	*/
09a57239	269	#define virt_to_phys virt_to_phys
4f04d8f0 CM	270	static inline phys_addr_t virt_to_phys(const volatile void *x)
	271	{
	272	return __virt_to_phys((unsigned long)(x));
	273	}
	274
09a57239	275	#define phys_to_virt phys_to_virt
4f04d8f0 CM	276	static inline void *phys_to_virt(phys_addr_t x)
	277	{
	278	return (void *)(__phys_to_virt(x));
	279	}
	280
	281	/*
	282	* Drivers should NOT use these either.
	283	*/
	284	#define __pa(x) __virt_to_phys((unsigned long)(x))
ec6d06ef LA	285	#define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
ec6d06ef LA	286	#define __pa_nodebug(x) __virt_to_phys_nodebug((unsigned long)(x))
4f04d8f0 CM	287	#define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
4f04d8f0 CM	288	#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
869dcfd1	289	#define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys((unsigned long)(x)))
2077be67	290	#define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
4f04d8f0 CM	291
	292	/*
	293	* virt_to_page(k) convert a _valid_ virtual address to struct page *
	294	* virt_addr_valid(k) indicates whether a virtual address is valid
	295	*/
5fd6690c	296	#define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET)
4f04d8f0	297
eea1bb22	298	#if !defined(CONFIG_SPARSEMEM_VMEMMAP) \|\| defined(CONFIG_DEBUG_VIRTUAL)
4f04d8f0	299	#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
ca219452	300	#define _virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
9f287591	301	#else
9cb1c5dd SC	302	#define __virt_to_pgoff(kaddr) (((u64)(kaddr) - PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page))
9cb1c5dd SC	303	#define __page_to_voff(kaddr) (((u64)(kaddr) - VMEMMAP_START) * PAGE_SIZE / sizeof(struct page))
9f287591	304
2813b9c0 AK	305	#define page_to_virt(page) ({ \
2813b9c0 AK	306	unsigned long __addr = \
9cb1c5dd	307	((__page_to_voff(page)) + PAGE_OFFSET); \
7732d20a QC	308	const void *__addr_tag = \
7732d20a QC	309	__tag_set((void *)__addr, page_kasan_tag(page)); \
366e37e4	310	((void *)__addr_tag); \
2813b9c0 AK	311	})
2813b9c0 AK	312
9cb1c5dd	313	#define virt_to_page(vaddr) ((struct page *)((__virt_to_pgoff(vaddr)) + VMEMMAP_START))
4f04d8f0	314
9cb1c5dd	315	#define _virt_addr_valid(kaddr) pfn_valid(__virt_to_phys((u64)(kaddr)) >> PAGE_SHIFT)
9f287591	316	#endif
4f04d8f0 CM	317	#endif
4f04d8f0 CM	318
e71fe3f9 AK	319	#define _virt_addr_is_linear(kaddr) \
	320	(__tag_reset((u64)(kaddr)) >= PAGE_OFFSET)
	321	#define virt_addr_valid(kaddr) \
	322	(_virt_addr_is_linear(kaddr) && _virt_addr_valid(kaddr))
ca219452	323
8a5b403d AB	324	/*
	325	* Given that the GIC architecture permits ITS implementations that can only be
	326	* configured with a LPI table address once, GICv3 systems with many CPUs may
	327	* end up reserving a lot of different regions after a kexec for their LPI
	328	* tables (one per CPU), as we are forced to reuse the same memory after kexec
	329	* (and thus reserve it persistently with EFI beforehand)
	330	*/
	331	#if defined(CONFIG_EFI) && defined(CONFIG_ARM_GIC_V3_ITS)
	332	# define INIT_MEMBLOCK_RESERVED_REGIONS (INIT_MEMBLOCK_REGIONS + NR_CPUS + 1)
	333	#endif
	334
4f04d8f0 CM	335	#include <asm-generic/memory_model.h>
	336
	337	#endif