arch/arm64/include/asm/memory.h - linux - Git at Google

 /* 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/sizes.h>
 #include <linux/types.h>
 #include <asm/bug.h>
 #include <asm/page-def.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
  *
  * If we are configured with a 52-bit kernel VA then our VMEMMAP_SIZE
  * needs to cover the memory region from the beginning of the 52-bit
  * PAGE_OFFSET all the way to PAGE_END for 48-bit. This allows us to
  * keep a constant PAGE_OFFSET and "fallback" to using the higher end
  * of the VMEMMAP where 52-bit support is not available in hardware.
  */
 #define VMEMMAP_SIZE ((_PAGE_END(VA_BITS_MIN) - PAGE_OFFSET) \
 			>> (PAGE_SHIFT - STRUCT_PAGE_MAX_SHIFT))

 /*
  * PAGE_OFFSET - the virtual address of the start of the linear map, at the
  *               start of the TTBR1 address space.
  * PAGE_END - the end of the linear map, where all other kernel mappings begin.
  * KIMAGE_VADDR - the virtual address of the start of the kernel image.
  * VA_BITS - the maximum number of bits for virtual addresses.
  */
 #define VA_BITS			(CONFIG_ARM64_VA_BITS)
 #define _PAGE_OFFSET(va)	(-(UL(1) << (va)))
 #define PAGE_OFFSET		(_PAGE_OFFSET(VA_BITS))
 #define KIMAGE_VADDR		(MODULES_END)
 #define BPF_JIT_REGION_START	(KASAN_SHADOW_END)
 #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		(-VMEMMAP_SIZE - SZ_2M)
 #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)

 #if VA_BITS > 48
 #define VA_BITS_MIN		(48)
 #else
 #define VA_BITS_MIN		(VA_BITS)
 #endif

 #define _PAGE_END(va)		(-(UL(1) << ((va) - 1)))

 #define KERNEL_START		_text
 #define KERNEL_END		_end

 /*
  * 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_OFFSET	_AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
 #define KASAN_SHADOW_END	((UL(1) << (64 - KASAN_SHADOW_SCALE_SHIFT)) \
 					+ KASAN_SHADOW_OFFSET)
 #define KASAN_THREAD_SHIFT	1
 #else
 #define KASAN_THREAD_SHIFT	0
 #define KASAN_SHADOW_END	(_PAGE_END(VA_BITS_MIN))
 #endif /* CONFIG_KASAN */

 #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__
 extern u64			vabits_actual;
 #define PAGE_END		(_PAGE_END(vabits_actual))

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

 extern s64			physvirt_offset;
 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;
 }

 /*
  * 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)	\
 	((__force __typeof__(addr))sign_extend64((__force u64)(addr), 55))

 #define untagged_addr(addr)	({					\
 	u64 __addr = (__force u64)(addr);					\
 	__addr &= __untagged_addr(__addr);				\
 	(__force __typeof__(addr))__addr;				\
 })

 #ifdef CONFIG_KASAN_SW_TAGS
 #define __tag_shifted(tag)	((u64)(tag) << 56)
 #define __tag_reset(addr)	__untagged_addr(addr)
 #define __tag_get(addr)		(__u8)((u64)(addr) >> 56)
 #else
 #define __tag_shifted(tag)	0UL
 #define __tag_reset(addr)	(addr)
 #define __tag_get(addr)		0
 #endif /* CONFIG_KASAN_SW_TAGS */

 static inline const void *__tag_set(const void *addr, u8 tag)
 {
 	u64 __addr = (u64)addr & ~__tag_shifted(0xff);
 	return (const void *)(__addr | __tag_shifted(tag));
 }

 /*
  * 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 at the bottom of the virtual address
  * space. Testing the top bit for the start of the region is a
  * sufficient check and avoids having to worry about the tag.
  */
 #define __is_lm_address(addr)	(!(((u64)addr) & BIT(vabits_actual - 1)))

 #define __lm_to_phys(addr)	(((addr) + physvirt_offset))
 #define __kimg_to_phys(addr)	((addr) - kimage_voffset)

 #define __virt_to_phys_nodebug(x) ({					\
 	phys_addr_t __x = (phys_addr_t)(__tag_reset(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 /* CONFIG_DEBUG_VIRTUAL */

 #define __phys_to_virt(x)	((unsigned long)((x) - physvirt_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(x)	convert a _valid_ virtual address to struct page *
  *  virt_addr_valid(x)	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(x)		pfn_to_page(virt_to_pfn(x))
 #else
 #define page_to_virt(x)	({						\
 	__typeof__(x) __page = x;					\
 	u64 __idx = ((u64)__page - VMEMMAP_START) / sizeof(struct page);\
 	u64 __addr = PAGE_OFFSET + (__idx * PAGE_SIZE);			\
 	(void *)__tag_set((const void *)__addr, page_kasan_tag(__page));\
 })

 #define virt_to_page(x)	({						\
 	u64 __idx = (__tag_reset((u64)x) - PAGE_OFFSET) / PAGE_SIZE;	\
 	u64 __addr = VMEMMAP_START + (__idx * sizeof(struct page));	\
 	(struct page *)__addr;						\
 })
 #endif /* !CONFIG_SPARSEMEM_VMEMMAP || CONFIG_DEBUG_VIRTUAL */

 #define virt_addr_valid(addr)	({					\
 	__typeof__(addr) __addr = addr;					\
 	__is_lm_address(__addr) && pfn_valid(virt_to_pfn(__addr));	\
 })

 #endif /* !ASSEMBLY */

 /*
  * 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 /* __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/sizes.h>
	#include <linux/types.h>
	#include <asm/bug.h>
	#include <asm/page-def.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
	*
	* If we are configured with a 52-bit kernel VA then our VMEMMAP_SIZE
	* needs to cover the memory region from the beginning of the 52-bit
	* PAGE_OFFSET all the way to PAGE_END for 48-bit. This allows us to
	* keep a constant PAGE_OFFSET and "fallback" to using the higher end
	* of the VMEMMAP where 52-bit support is not available in hardware.
	*/
	#define VMEMMAP_SIZE ((_PAGE_END(VA_BITS_MIN) - PAGE_OFFSET) \
	>> (PAGE_SHIFT - STRUCT_PAGE_MAX_SHIFT))

	/*
	* PAGE_OFFSET - the virtual address of the start of the linear map, at the
	* start of the TTBR1 address space.
	* PAGE_END - the end of the linear map, where all other kernel mappings begin.
	* KIMAGE_VADDR - the virtual address of the start of the kernel image.
	* VA_BITS - the maximum number of bits for virtual addresses.
	*/
	#define VA_BITS (CONFIG_ARM64_VA_BITS)
	#define _PAGE_OFFSET(va) (-(UL(1) << (va)))
	#define PAGE_OFFSET (_PAGE_OFFSET(VA_BITS))
	#define KIMAGE_VADDR (MODULES_END)
	#define BPF_JIT_REGION_START (KASAN_SHADOW_END)
	#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 (-VMEMMAP_SIZE - SZ_2M)
	#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)

	#if VA_BITS > 48
	#define VA_BITS_MIN (48)
	#else
	#define VA_BITS_MIN (VA_BITS)
	#endif

	#define _PAGE_END(va) (-(UL(1) << ((va) - 1)))

	#define KERNEL_START _text
	#define KERNEL_END _end

	/*
	* 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_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
	#define KASAN_SHADOW_END ((UL(1) << (64 - KASAN_SHADOW_SCALE_SHIFT)) \
	+ KASAN_SHADOW_OFFSET)
	#define KASAN_THREAD_SHIFT 1
	#else
	#define KASAN_THREAD_SHIFT 0
	#define KASAN_SHADOW_END (_PAGE_END(VA_BITS_MIN))
	#endif /* CONFIG_KASAN */

	#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__
	extern u64 vabits_actual;
	#define PAGE_END (_PAGE_END(vabits_actual))

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

	extern s64 physvirt_offset;
	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;
	}

	/*
	* 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) \
	((__force __typeof__(addr))sign_extend64((__force u64)(addr), 55))

	#define untagged_addr(addr) ({ \
	u64 __addr = (__force u64)(addr); \
	__addr &= __untagged_addr(__addr); \
	(__force __typeof__(addr))__addr; \
	})

	#ifdef CONFIG_KASAN_SW_TAGS
	#define __tag_shifted(tag) ((u64)(tag) << 56)
	#define __tag_reset(addr) __untagged_addr(addr)
	#define __tag_get(addr) (__u8)((u64)(addr) >> 56)
	#else
	#define __tag_shifted(tag) 0UL
	#define __tag_reset(addr) (addr)
	#define __tag_get(addr) 0
	#endif /* CONFIG_KASAN_SW_TAGS */

	static inline const void __tag_set(const void addr, u8 tag)
	{
	u64 __addr = (u64)addr & ~__tag_shifted(0xff);
	return (const void *)(__addr \| __tag_shifted(tag));
	}

	/*
	* 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 at the bottom of the virtual address
	* space. Testing the top bit for the start of the region is a
	* sufficient check and avoids having to worry about the tag.
	*/
	#define __is_lm_address(addr) (!(((u64)addr) & BIT(vabits_actual - 1)))

	#define __lm_to_phys(addr) (((addr) + physvirt_offset))
	#define __kimg_to_phys(addr) ((addr) - kimage_voffset)

	#define __virt_to_phys_nodebug(x) ({ \
	phys_addr_t __x = (phys_addr_t)(__tag_reset(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 /* CONFIG_DEBUG_VIRTUAL */

	#define __phys_to_virt(x) ((unsigned long)((x) - physvirt_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(x) convert a _valid_ virtual address to struct page *
	* virt_addr_valid(x) 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(x) pfn_to_page(virt_to_pfn(x))
	#else
	#define page_to_virt(x) ({ \
	__typeof__(x) __page = x; \
	u64 __idx = ((u64)__page - VMEMMAP_START) / sizeof(struct page);\
	u64 __addr = PAGE_OFFSET + (__idx * PAGE_SIZE); \
	(void )__tag_set((const void )__addr, page_kasan_tag(__page));\
	})

	#define virt_to_page(x) ({ \
	u64 __idx = (__tag_reset((u64)x) - PAGE_OFFSET) / PAGE_SIZE; \
	u64 __addr = VMEMMAP_START + (__idx * sizeof(struct page)); \
	(struct page *)__addr; \
	})
	#endif /* !CONFIG_SPARSEMEM_VMEMMAP \|\| CONFIG_DEBUG_VIRTUAL */

	#define virt_addr_valid(addr) ({ \
	__typeof__(addr) __addr = addr; \
	__is_lm_address(__addr) && pfn_valid(virt_to_pfn(__addr)); \
	})

	#endif /* !ASSEMBLY */

	/*
	* 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 /* __ASM_MEMORY_H */