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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!
*/
#ifdef CONFIG_DEBUG_BUGVERBOSE
extern void do_BUG(const char *file, int line);
#define BUG() do { \
do_BUG(__FILE__, __LINE__); \
__asm__ __volatile__("ud2"); \
} while (0)
#else
#define BUG() __asm__ __volatile__(".byte 0x0f,0x0b")
#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)
#endif /* __KERNEL__ */
#endif /* _I386_PAGE_H */
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