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Current File : /proc/self/root/lib/modules/5.4.0-163-generic/build/arch/riscv/include/asm/page.h
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
 * Copyright (C) 2012 Regents of the University of California
 * Copyright (C) 2017 SiFive
 * Copyright (C) 2017 XiaojingZhu <zhuxiaoj@ict.ac.cn>
 */

#ifndef _ASM_RISCV_PAGE_H
#define _ASM_RISCV_PAGE_H

#include <linux/pfn.h>
#include <linux/const.h>

#define PAGE_SHIFT	(12)
#define PAGE_SIZE	(_AC(1, UL) << PAGE_SHIFT)
#define PAGE_MASK	(~(PAGE_SIZE - 1))

#ifdef CONFIG_64BIT
#define HUGE_MAX_HSTATE		2
#else
#define HUGE_MAX_HSTATE		1
#endif
#define HPAGE_SHIFT		PMD_SHIFT
#define HPAGE_SIZE		(_AC(1, UL) << HPAGE_SHIFT)
#define HPAGE_MASK              (~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)

/*
 * PAGE_OFFSET -- the first address of the first page of memory.
 * When not using MMU this corresponds to the first free page in
 * physical memory (aligned on a page boundary).
 */
#define PAGE_OFFSET		_AC(CONFIG_PAGE_OFFSET, UL)

#define KERN_VIRT_SIZE (-PAGE_OFFSET)

#ifndef __ASSEMBLY__

#define PAGE_UP(addr)	(((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
#define PAGE_DOWN(addr)	((addr)&(~((PAGE_SIZE)-1)))

/* align addr on a size boundary - adjust address up/down if needed */
#define _ALIGN_UP(addr, size)	(((addr)+((size)-1))&(~((size)-1)))
#define _ALIGN_DOWN(addr, size)	((addr)&(~((size)-1)))

/* align addr on a size boundary - adjust address up if needed */
#define _ALIGN(addr, size)	_ALIGN_UP(addr, size)

#define clear_page(pgaddr)			memset((pgaddr), 0, PAGE_SIZE)
#define copy_page(to, from)			memcpy((to), (from), PAGE_SIZE)

#define clear_user_page(pgaddr, vaddr, page)	memset((pgaddr), 0, PAGE_SIZE)
#define copy_user_page(vto, vfrom, vaddr, topg) \
			memcpy((vto), (vfrom), PAGE_SIZE)

/*
 * Use struct definitions to apply C type checking
 */

/* Page Global Directory entry */
typedef struct {
	unsigned long pgd;
} pgd_t;

/* Page Table entry */
typedef struct {
	unsigned long pte;
} pte_t;

typedef struct {
	unsigned long pgprot;
} pgprot_t;

typedef struct page *pgtable_t;

#define pte_val(x)	((x).pte)
#define pgd_val(x)	((x).pgd)
#define pgprot_val(x)	((x).pgprot)

#define __pte(x)	((pte_t) { (x) })
#define __pgd(x)	((pgd_t) { (x) })
#define __pgprot(x)	((pgprot_t) { (x) })

#ifdef CONFIG_64BIT
#define PTE_FMT "%016lx"
#else
#define PTE_FMT "%08lx"
#endif

extern unsigned long va_pa_offset;
extern unsigned long pfn_base;

extern unsigned long max_low_pfn;
extern unsigned long min_low_pfn;

#define __pa(x)		((unsigned long)(x) - va_pa_offset)
#define __va(x)		((void *)((unsigned long) (x) + va_pa_offset))

#define phys_to_pfn(phys)	(PFN_DOWN(phys))
#define pfn_to_phys(pfn)	(PFN_PHYS(pfn))

#define virt_to_pfn(vaddr)	(phys_to_pfn(__pa(vaddr)))
#define pfn_to_virt(pfn)	(__va(pfn_to_phys(pfn)))

#define virt_to_page(vaddr)	(pfn_to_page(virt_to_pfn(vaddr)))
#define page_to_virt(page)	(pfn_to_virt(page_to_pfn(page)))

#define page_to_phys(page)	(pfn_to_phys(page_to_pfn(page)))
#define page_to_bus(page)	(page_to_phys(page))
#define phys_to_page(paddr)	(pfn_to_page(phys_to_pfn(paddr)))

#ifdef CONFIG_FLATMEM
#define pfn_valid(pfn) \
	(((pfn) >= pfn_base) && (((pfn)-pfn_base) < max_mapnr))
#endif

#define ARCH_PFN_OFFSET		(pfn_base)

#endif /* __ASSEMBLY__ */

#define virt_addr_valid(vaddr)	({						\
	unsigned long _addr = (unsigned long)vaddr;				\
	(unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr));	\
})

#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | \
				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>

#endif /* _ASM_RISCV_PAGE_H */

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