| 1 | /* $Id: page.h,v 1.1.1.1 2003/07/02 13:56:58 eleph Exp $ */
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| 2 |
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| 3 | #ifndef _I386_PAGE_H
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| 4 | #define _I386_PAGE_H
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| 5 |
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| 6 | /* PAGE_SHIFT determines the page size */
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| 7 | #define PAGE_SHIFT 12
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| 8 | #define PAGE_SIZE (1UL << PAGE_SHIFT)
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| 9 | #define PAGE_MASK (~(PAGE_SIZE-1))
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| 10 |
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| 11 | #ifdef __KERNEL__
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| 12 | #ifndef __ASSEMBLY__
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| 13 |
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| 14 | //#include <linux/config.h>
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| 15 |
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| 16 | /*
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| 17 | * On older X86 processors its not a win to use MMX here it seems.
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| 18 | * Maybe the K6-III ?
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| 19 | */
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| 20 |
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| 21 | #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
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| 22 | #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
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| 23 |
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| 24 | /*
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| 25 | * These are used to make use of C type-checking..
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| 26 | */
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| 27 | #if CONFIG_X86_PAE
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| 28 | typedef struct { unsigned long long pte; } pte_t;
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| 29 | typedef struct { unsigned long long pmd; } pmd_t;
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| 30 | typedef struct { unsigned long long pgd; } pgd_t;
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| 31 | #else
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| 32 | typedef struct { unsigned long pte; } pte_t;
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| 33 | typedef struct { unsigned long pmd; } pmd_t;
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| 34 | typedef struct { unsigned long pgd; } pgd_t;
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| 35 | #endif
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| 36 |
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| 37 | typedef struct { unsigned long pgprot; } pgprot_t;
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| 38 |
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| 39 | #define pte_val(x) ((x).pte)
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| 40 | #define pmd_val(x) ((x).pmd)
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| 41 | #define pgd_val(x) ((x).pgd)
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| 42 | #define pgprot_val(x) ((x).pgprot)
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| 43 |
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| 44 | #define __pgprot(x) ((pgprot_t) { (x) } )
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| 45 |
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| 46 | #endif /* !__ASSEMBLY__ */
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| 47 |
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| 48 | /* to align the pointer to the (next) page boundary */
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| 49 | #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
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| 50 |
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| 51 | /*
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| 52 | * This handles the memory map.. We could make this a config
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| 53 | * option, but too many people screw it up, and too few need
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| 54 | * it.
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| 55 | *
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| 56 | * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
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| 57 | * a virtual address space of one gigabyte, which limits the
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| 58 | * amount of physical memory you can use to about 950MB.
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| 59 | *
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| 60 | * If you want more physical memory than this then see the CONFIG_BIGMEM
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| 61 | * option in the kernel configuration.
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| 62 | */
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| 63 |
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| 64 | #define __PAGE_OFFSET (0xC0000000)
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| 65 |
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| 66 | #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
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| 67 | #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
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| 68 | #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
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| 69 | #define MAP_NR(addr) (__pa(addr) >> PAGE_SHIFT)
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| 70 | #define PHYSMAP_NR(addr) ((unsigned long)(addr) >> PAGE_SHIFT)
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| 71 |
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| 72 | #endif /* __KERNEL__ */
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| 73 |
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| 74 | #endif /* _I386_PAGE_H */
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