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 extern unsigned long long __supported_pte_mask;
44 extern int nx_enabled;
45 typedef struct { unsigned long pte_low, pte_high; } pte_t;
46 typedef struct { unsigned long long pmd; } pmd_t;
47 typedef struct { unsigned long long pgd; } pgd_t;
48 typedef struct { unsigned long long pgprot; } pgprot_t;
49 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
50 #define HPAGE_SHIFT 21
53 typedef struct { unsigned long pte_low; } pte_t;
54 typedef struct { unsigned long pmd; } pmd_t;
55 typedef struct { unsigned long pgd; } pgd_t;
56 typedef struct { unsigned long pgprot; } pgprot_t;
57 #define boot_pte_t pte_t /* or would you rather have a typedef */
58 #define pte_val(x) ((x).pte_low)
59 #define HPAGE_SHIFT 22
61 #define PTE_MASK PAGE_MASK
63 #ifdef CONFIG_HUGETLB_PAGE
64 #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
65 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
66 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
70 #define pmd_val(x) ((x).pmd)
71 #define pgd_val(x) ((x).pgd)
72 #define pgprot_val(x) ((x).pgprot)
74 #define __pte(x) ((pte_t) { (x) } )
75 #define __pmd(x) ((pmd_t) { (x) } )
76 #define __pgd(x) ((pgd_t) { (x) } )
77 #define __pgprot(x) ((pgprot_t) { (x) } )
79 #endif /* !__ASSEMBLY__ */
81 /* to align the pointer to the (next) page boundary */
82 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
85 * This handles the memory map.. We could make this a config
86 * option, but too many people screw it up, and too few need
89 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
90 * a virtual address space of one gigabyte, which limits the
91 * amount of physical memory you can use to about 950MB.
93 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
94 * and CONFIG_HIGHMEM64G options in the kernel configuration.
100 * This much address space is reserved for vmalloc() and iomap()
101 * as well as fixmap mappings.
103 extern unsigned int __VMALLOC_RESERVE;
105 /* Pure 2^n version of get_order */
106 static __inline__ int get_order(unsigned long size)
110 size = (size-1) >> (PAGE_SHIFT-1);
119 extern int sysctl_legacy_va_layout;
121 #endif /* __ASSEMBLY__ */
123 #if defined(CONFIG_SPLIT_3GB)
124 #define __PAGE_OFFSET (0xC0000000)
125 #elif defined(CONFIG_SPLIT_25GB)
126 #define __PAGE_OFFSET (0xA0000000)
127 #elif defined(CONFIG_SPLIT_2GB)
128 #define __PAGE_OFFSET (0x80000000)
129 #elif defined(CONFIG_SPLIT_15GB)
130 #define __PAGE_OFFSET (0x60000000)
131 #elif defined(CONFIG_SPLIT_1GB)
132 #define __PAGE_OFFSET (0x40000000)
135 #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
136 #define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE)
137 #define __MAXMEM (-__PAGE_OFFSET-__VMALLOC_RESERVE)
138 #define MAXMEM ((unsigned long)(-PAGE_OFFSET-VMALLOC_RESERVE))
140 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
141 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
142 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
143 #ifndef CONFIG_DISCONTIGMEM
144 #define pfn_to_page(pfn) (mem_map + (pfn))
145 #define page_to_pfn(page) ((unsigned long)((page) - mem_map))
146 #define pfn_valid(pfn) ((pfn) < max_mapnr)
147 #endif /* !CONFIG_DISCONTIGMEM */
148 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
150 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
152 #define VM_DATA_DEFAULT_FLAGS \
153 (VM_READ | VM_WRITE | \
154 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
155 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
157 #endif /* __KERNEL__ */
159 #endif /* _I386_PAGE_H */