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)
39 #define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr)
40 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
43 * These are used to make use of C type-checking..
45 extern int nx_enabled;
47 extern unsigned long long __supported_pte_mask;
48 typedef struct { unsigned long pte_low, pte_high; } pte_t;
49 typedef struct { unsigned long long pmd; } pmd_t;
50 typedef struct { unsigned long long pgd; } pgd_t;
51 typedef struct { unsigned long long pgprot; } pgprot_t;
52 #define pmd_val(x) ((x).pmd)
53 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
54 #define __pmd(x) ((pmd_t) { (x) } )
55 #define HPAGE_SHIFT 21
57 typedef struct { unsigned long pte_low; } pte_t;
58 typedef struct { unsigned long pgd; } pgd_t;
59 typedef struct { unsigned long pgprot; } pgprot_t;
60 #define boot_pte_t pte_t /* or would you rather have a typedef */
61 #define pte_val(x) ((x).pte_low)
62 #define HPAGE_SHIFT 22
64 #define PTE_MASK PAGE_MASK
66 #ifdef CONFIG_HUGETLB_PAGE
67 #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
68 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
69 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
70 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
71 #define ARCH_HAS_HUGETLB_CLEAN_STALE_PGTABLE
74 #define pgd_val(x) ((x).pgd)
75 #define pgprot_val(x) ((x).pgprot)
77 #define __pte(x) ((pte_t) { (x) } )
78 #define __pgd(x) ((pgd_t) { (x) } )
79 #define __pgprot(x) ((pgprot_t) { (x) } )
81 #endif /* !__ASSEMBLY__ */
83 /* to align the pointer to the (next) page boundary */
84 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
87 * This handles the memory map.. We could make this a config
88 * option, but too many people screw it up, and too few need
91 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
92 * a virtual address space of one gigabyte, which limits the
93 * amount of physical memory you can use to about 950MB.
95 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
96 * and CONFIG_HIGHMEM64G options in the kernel configuration.
102 * This much address space is reserved for vmalloc() and iomap()
103 * as well as fixmap mappings.
105 extern unsigned int __VMALLOC_RESERVE;
107 /* Pure 2^n version of get_order */
108 static __inline__ int get_order(unsigned long size)
112 size = (size-1) >> (PAGE_SHIFT-1);
121 extern int sysctl_legacy_va_layout;
123 extern int page_is_ram(unsigned long pagenr);
125 #endif /* __ASSEMBLY__ */
128 #define __PAGE_OFFSET (0xC0000000)
129 #define __PHYSICAL_START CONFIG_PHYSICAL_START
131 #define __PAGE_OFFSET (0xC0000000UL)
132 #define __PHYSICAL_START ((unsigned long)CONFIG_PHYSICAL_START)
134 #define __KERNEL_START (__PAGE_OFFSET + __PHYSICAL_START)
137 #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
138 #define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE)
139 #define MAXMEM (-__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 #ifdef CONFIG_FLATMEM
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_FLATMEM */
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 */