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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))

#define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
#define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)

#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 it's 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, pg)        clear_page(page)
#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)

/*
 * These are used to make use of C type-checking..
 */
#ifdef 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))
#define HPAGE_SHIFT     21
#else
typedef struct { unsigned long pte_low; } pte_t;
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pgd; } pgd_t;
#define boot_pte_t pte_t /* or would you rather have a typedef */
#define pte_val(x)      ((x).pte_low)
#define HPAGE_SHIFT     22
#endif
#define PTE_MASK        PAGE_MASK

#ifdef CONFIG_HUGETLB_PAGE
#define HPAGE_SIZE      ((1UL) << HPAGE_SHIFT)
#define HPAGE_MASK      (~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
#endif

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.
 */

/*
 * This much address space is reserved for vmalloc() and iomap()
 * as well as fixmap mappings.
 */
#define __VMALLOC_RESERVE       (128 << 20)

#ifndef __ASSEMBLY__

/* 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__ */

#ifdef __ASSEMBLY__
#define __PAGE_OFFSET           (0xC0000000)
#else
#define __PAGE_OFFSET           (0xC0000000UL)
#endif


#define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
#define VMALLOC_RESERVE         ((unsigned long)__VMALLOC_RESERVE)
#define MAXMEM                  (-__PAGE_OFFSET-__VMALLOC_RESERVE)
#define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
#define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
#define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
#ifndef CONFIG_DISCONTIGMEM
#define pfn_to_page(pfn)        (mem_map + (pfn))
#define page_to_pfn(page)       ((unsigned long)((page) - mem_map))
#define pfn_valid(pfn)          ((pfn) < max_mapnr)
#endif /* !CONFIG_DISCONTIGMEM */
#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)

#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

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

#endif /* __KERNEL__ */

#endif /* _I386_PAGE_H */