4 /* PAGE_SHIFT determines the page size */
6 #define PAGE_SIZE (1UL << PAGE_SHIFT)
7 #define PAGE_MASK (~(PAGE_SIZE-1))
9 #define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
10 #define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)
15 #include <linux/config.h>
17 #ifdef CONFIG_X86_USE_3DNOW
21 #define clear_page(page) mmx_clear_page((void *)(page))
22 #define copy_page(to,from) mmx_copy_page(to,from)
27 * On older X86 processors it's not a win to use MMX here it seems.
31 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
32 #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
36 #define clear_user_page(page, vaddr, pg) clear_page(page)
37 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
40 * These are used to make use of C type-checking..
43 typedef struct { unsigned long pte_low, pte_high; } pte_t;
44 typedef struct { unsigned long long pmd; } pmd_t;
45 typedef struct { unsigned long long pgd; } pgd_t;
46 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
47 #define HPAGE_SHIFT 21
49 typedef struct { unsigned long pte_low; } pte_t;
50 typedef struct { unsigned long pmd; } pmd_t;
51 typedef struct { unsigned long pgd; } pgd_t;
52 #define boot_pte_t pte_t /* or would you rather have a typedef */
53 #define pte_val(x) ((x).pte_low)
54 #define HPAGE_SHIFT 22
56 #define PTE_MASK PAGE_MASK
58 #ifdef CONFIG_HUGETLB_PAGE
59 #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
60 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
61 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
64 typedef struct { unsigned long pgprot; } pgprot_t;
66 #define pmd_val(x) ((x).pmd)
67 #define pgd_val(x) ((x).pgd)
68 #define pgprot_val(x) ((x).pgprot)
70 #define __pte(x) ((pte_t) { (x) } )
71 #define __pmd(x) ((pmd_t) { (x) } )
72 #define __pgd(x) ((pgd_t) { (x) } )
73 #define __pgprot(x) ((pgprot_t) { (x) } )
75 #endif /* !__ASSEMBLY__ */
77 /* to align the pointer to the (next) page boundary */
78 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
81 * This handles the memory map.. We could make this a config
82 * option, but too many people screw it up, and too few need
85 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
86 * a virtual address space of one gigabyte, which limits the
87 * amount of physical memory you can use to about 950MB.
89 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
90 * and CONFIG_HIGHMEM64G options in the kernel configuration.
94 * This much address space is reserved for vmalloc() and iomap()
95 * as well as fixmap mappings.
97 #define __VMALLOC_RESERVE (128 << 20)
101 /* Pure 2^n version of get_order */
102 static __inline__ int get_order(unsigned long size)
106 size = (size-1) >> (PAGE_SHIFT-1);
115 #endif /* __ASSEMBLY__ */
118 #define __PAGE_OFFSET (0xC0000000)
120 #define __PAGE_OFFSET (0xC0000000UL)
124 #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
125 #define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE)
126 #define MAXMEM (-__PAGE_OFFSET-__VMALLOC_RESERVE)
127 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
128 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
129 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
130 #ifndef CONFIG_DISCONTIGMEM
131 #define pfn_to_page(pfn) (mem_map + (pfn))
132 #define page_to_pfn(page) ((unsigned long)((page) - mem_map))
133 #define pfn_valid(pfn) ((pfn) < max_mapnr)
134 #endif /* !CONFIG_DISCONTIGMEM */
135 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
137 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
139 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
140 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
142 #endif /* __KERNEL__ */
144 #endif /* _I386_PAGE_H */