Orange Pi5 kernel

 /* 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/const.h>
#include <linux/sizes.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 VMEMMAP_END		(VMEMMAP_START + 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)
 
#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.
 */
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
#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).
 *
 *  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
 
/*
 * Memory types available.
 *
 * IMPORTANT: MT_NORMAL must be index 0 since vm_get_page_prot() may 'or' in
 *	      the MT_NORMAL_TAGGED memory type for PROT_MTE mappings. Note
 *	      that protection_map[] only contains MT_NORMAL attributes.
 */
#define MT_NORMAL		0
#define MT_NORMAL_TAGGED	1
#define MT_NORMAL_NC		2
#define MT_NORMAL_WT		3
#define MT_DEVICE_nGnRnE	4
#define MT_DEVICE_nGnRE		5
#define MT_DEVICE_GRE		6
#define MT_NORMAL_iNC_oWB	7
 
/*
 * 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/compiler.h>
#include <linux/mmdebug.h>
#include <linux/types.h>
#include <asm/bug.h>
 
extern u64			vabits_actual;
#define PAGE_END		(_PAGE_END(vabits_actual))
 
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 */
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;				\
})
 
#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_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 || CONFIG_KASAN_HW_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));
}
 
#ifdef CONFIG_KASAN_HW_TAGS
#define arch_enable_tagging_sync()		mte_enable_kernel_sync()
#define arch_enable_tagging_async()		mte_enable_kernel_async()
#define arch_set_tagging_report_once(state)	mte_set_report_once(state)
#define arch_force_async_tag_fault()		mte_check_tfsr_exit()
#define arch_get_random_tag()			mte_get_random_tag()
#define arch_get_mem_tag(addr)			mte_get_mem_tag(addr)
#define arch_set_mem_tag_range(addr, size, tag, init)	\
<------><------><------>mte_set_mem_tag_range((addr), (size), (tag), (init))
#endif /* CONFIG_KASAN_HW_TAGS */
 
/*
 * 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.
 */
 
 
/*
 * Check whether an arbitrary address is within the linear map, which
 * lives in the [PAGE_OFFSET, PAGE_END) interval at the bottom of the
 * kernel's TTBR1 address range.
 */
#define __is_lm_address(addr)	(((u64)(addr) ^ PAGE_OFFSET) < (PAGE_END - PAGE_OFFSET))
 
#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)(__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) - 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))
 
/*
 * With non-canonical CFI jump tables, the compiler replaces function
 * address references with the address of the function's CFI jump
 * table entry. This results in __pa_symbol(function) returning the
 * physical address of the jump table entry, which can lead to address
 * space confusion since the jump table points to the function's
 * virtual address. Therefore, use inline assembly to ensure we are
 * always taking the address of the actual function.
 */
#define __va_function(x) ({						\
<------>void *addr;							\
<------>asm("adrp %0, " __stringify(x) "\n\t"				\
<------>    "add  %0, %0, :lo12:" __stringify(x) : "=r" (addr));	\
<------>addr;								\
})
 
#define __pa_function(x) 	__pa_symbol(__va_function(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 page_to_virt(x)	({						\
<------>__typeof__(x) __page = x;					\
<------>void *__addr = __va(page_to_phys(__page));			\
<------>(void *)__tag_set((const void *)__addr, page_kasan_tag(__page));\
})
#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 = __tag_reset(addr);			\
<------>__is_lm_address(__addr) && pfn_valid(virt_to_pfn(__addr));	\
})
 
void dump_mem_limit(void);
#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/const.h>
	#include <linux/sizes.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 VMEMMAP_END (VMEMMAP_START + 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)

	#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.
	*/
	#if defined(CONFIG_KASAN_GENERIC) \|\| defined(CONFIG_KASAN_SW_TAGS)
	#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).
	*
	* 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

	/*
	* Memory types available.
	*
	* IMPORTANT: MT_NORMAL must be index 0 since vm_get_page_prot() may 'or' in
	* the MT_NORMAL_TAGGED memory type for PROT_MTE mappings. Note
	* that protection_map[] only contains MT_NORMAL attributes.
	*/
	#define MT_NORMAL 0
	#define MT_NORMAL_TAGGED 1
	#define MT_NORMAL_NC 2
	#define MT_NORMAL_WT 3
	#define MT_DEVICE_nGnRnE 4
	#define MT_DEVICE_nGnRE 5
	#define MT_DEVICE_GRE 6
	#define MT_NORMAL_iNC_oWB 7

	/*
	* 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/compiler.h>
	#include <linux/mmdebug.h>
	#include <linux/types.h>
	#include <asm/bug.h>

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

	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 */
	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; \
	})

	#if defined(CONFIG_KASAN_SW_TAGS) \|\| defined(CONFIG_KASAN_HW_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 \|\| CONFIG_KASAN_HW_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));
	}

	#ifdef CONFIG_KASAN_HW_TAGS
	#define arch_enable_tagging_sync() mte_enable_kernel_sync()
	#define arch_enable_tagging_async() mte_enable_kernel_async()
	#define arch_set_tagging_report_once(state) mte_set_report_once(state)
	#define arch_force_async_tag_fault() mte_check_tfsr_exit()
	#define arch_get_random_tag() mte_get_random_tag()
	#define arch_get_mem_tag(addr) mte_get_mem_tag(addr)
	#define arch_set_mem_tag_range(addr, size, tag, init) \
	<------><------><------>mte_set_mem_tag_range((addr), (size), (tag), (init))
	#endif /* CONFIG_KASAN_HW_TAGS */

	/*
	* 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.
	*/


	/*
	* Check whether an arbitrary address is within the linear map, which
	* lives in the [PAGE_OFFSET, PAGE_END) interval at the bottom of the
	* kernel's TTBR1 address range.
	*/
	#define __is_lm_address(addr) (((u64)(addr) ^ PAGE_OFFSET) < (PAGE_END - PAGE_OFFSET))

	#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)(__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) - 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))

	/*
	* With non-canonical CFI jump tables, the compiler replaces function
	* address references with the address of the function's CFI jump
	* table entry. This results in __pa_symbol(function) returning the
	* physical address of the jump table entry, which can lead to address
	* space confusion since the jump table points to the function's
	* virtual address. Therefore, use inline assembly to ensure we are
	* always taking the address of the actual function.
	*/
	#define __va_function(x) ({ \
	<------>void *addr; \
	<------>asm("adrp %0, " __stringify(x) "\n\t" \
	<------> "add %0, %0, :lo12:" __stringify(x) : "=r" (addr)); \
	<------>addr; \
	})

	#define __pa_function(x) __pa_symbol(__va_function(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 page_to_virt(x) ({ \
	<------>__typeof__(x) __page = x; \
	<------>void *__addr = __va(page_to_phys(__page)); \
	<------>(void )__tag_set((const void )__addr, page_kasan_tag(__page));\
	})
	#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 = __tag_reset(addr); \
	<------>__is_lm_address(__addr) && pfn_valid(virt_to_pfn(__addr)); \
	})

	void dump_mem_limit(void);
	#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 */