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#ifndef _I386_PAGE_H

#define _I386_PAGE_H

/* PAGE_SHIFT determines the page size */

#define PAGE_SHIFT      12

#define PAGE_SIZE       (1UL << PAGE_SHIFT)

#define PAGE_MASK       (~(PAGE_SIZE-1))

#ifdef __KERNEL__

#ifndef __ASSEMBLY__

#include <linux/config.h>

#ifdef CONFIG_X86_USE_3DNOW

#include <asm/mmx.h>

#define clear_page(page)        mmx_clear_page((void *)(page))

#define copy_page(to,from)      mmx_copy_page(to,from)

#else

/*

 *      On older X86 processors its not a win to use MMX here it seems.

 *      Maybe the K6-III ?

 */

#define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)

#define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)

#endif

#define clear_user_page(page, vaddr)    clear_page(page)

#define copy_user_page(to, from, vaddr) copy_page(to, from)

/*

 * These are used to make use of C type-checking..

 */

#if CONFIG_X86_PAE

typedef struct { unsigned long pte_low, pte_high; } pte_t;

typedef struct { unsigned long long pmd; } pmd_t;

typedef struct { unsigned long long pgd; } pgd_t;

#define pte_val(x)      ((x).pte_low | ((unsigned long long)(x).pte_high << 32))

#else

typedef struct { unsigned long pte_low; } pte_t;

typedef struct { unsigned long pmd; } pmd_t;

typedef struct { unsigned long pgd; } pgd_t;

#define pte_val(x)      ((x).pte_low)

#endif

#define PTE_MASK        PAGE_MASK

typedef struct { unsigned long pgprot; } pgprot_t;

#define pmd_val(x)      ((x).pmd)

#define pgd_val(x)      ((x).pgd)

#define pgprot_val(x)   ((x).pgprot)

#define __pte(x) ((pte_t) { (x) } )

#define __pmd(x) ((pmd_t) { (x) } )

#define __pgd(x) ((pgd_t) { (x) } )

#define __pgprot(x)     ((pgprot_t) { (x) } )

#endif /* !__ASSEMBLY__ */

/* to align the pointer to the (next) page boundary */

#define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)

/*

 * This handles the memory map.. We could make this a config

 * option, but too many people screw it up, and too few need

 * it.

 *

 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has

 * a virtual address space of one gigabyte, which limits the

 * amount of physical memory you can use to about 950MB.

 *

 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G

 * and CONFIG_HIGHMEM64G options in the kernel configuration.

 */

#define __PAGE_OFFSET           (0xC0000000)

/*

 * This much address space is reserved for vmalloc() and iomap()

 * as well as fixmap mappings.

 */

#define __VMALLOC_RESERVE       (128 << 20)

#ifndef __ASSEMBLY__

/*

 * Tell the user there is some problem. Beep too, so we can

 * see^H^H^Hhear bugs in early bootup as well!

 * The offending file and line are encoded after the "officially

 * undefined" opcode for parsing in the trap handler.

 */

#if 1   /* Set to zero for a slightly smaller kernel */

#define BUG()                           \

 __asm__ __volatile__(  "ud2\n"         \

                        "\t.word %c0\n" \

                        "\t.long %c1\n" \

                         : : "i" (__LINE__), "i" (__FILE__))

#else

#define BUG() __asm__ __volatile__("ud2\n")

#endif

#define PAGE_BUG(page) do { \

        BUG(); \

} while (0)

/* Pure 2^n version of get_order */

static __inline__ int get_order(unsigned long size)

{

        int order;

        size = (size-1) >> (PAGE_SHIFT-1);

        order = -1;

        do {

                size >>= 1;

                order++;

        } while (size);

        return order;

}

#endif /* __ASSEMBLY__ */

#define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)

#define VMALLOC_RESERVE         ((unsigned long)__VMALLOC_RESERVE)

#define __MAXMEM                (-__PAGE_OFFSET-__VMALLOC_RESERVE)

#define MAXMEM                  ((unsigned long)(-PAGE_OFFSET-VMALLOC_RESERVE))

#define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)

#define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))

#define virt_to_page(kaddr)     (mem_map + (__pa(kaddr) >> PAGE_SHIFT))

#define VALID_PAGE(page)        ((page - mem_map) < max_mapnr)

#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \

                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#endif /* __KERNEL__ */

#endif /* _I386_PAGE_H */