1. 根目录:
2. arch
3. unicore32
4. include
5. asm
6. page.h

/*
 * linux/arch/unicore32/include/asm/page.h
 *
 * Code specific to PKUnity SoC and UniCore ISA
 *
 * Copyright (C) 2001-2010 GUAN Xue-tao
 *
 * 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.
 */
#ifndef __UNICORE_PAGE_H__
#define __UNICORE_PAGE_H__

/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT		12
#define PAGE_SIZE		(_AC(1, UL) << PAGE_SHIFT)
#define PAGE_MASK		(~(PAGE_SIZE-1))

#ifndef __ASSEMBLY__

struct page;
struct vm_area_struct;

#define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
extern void copy_page(void *to, const void *from);

#define clear_user_page(page, vaddr, pg)	clear_page(page)
#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)

#undef STRICT_MM_TYPECHECKS

#ifdef STRICT_MM_TYPECHECKS
/*
 * These are used to make use of C type-checking..
 */
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_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) })

#else
/*
 * .. while these make it easier on the compiler
 */
typedef unsigned long pte_t;
typedef unsigned long pgd_t;
typedef unsigned long pgprot_t;

#define pte_val(x)      (x)
#define pgd_val(x)      (x)
#define pgprot_val(x)   (x)

#define __pte(x)        (x)
#define __pgd(x)	(x)
#define __pgprot(x)     (x)

#endif /* STRICT_MM_TYPECHECKS */

typedef struct page *pgtable_t;

extern int pfn_valid(unsigned long);

#include <asm/memory.h>

#endif /* !__ASSEMBLY__ */

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

#include <asm-generic/getorder.h>

#endif