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)
16 #ifdef CONFIG_X86_USE_3DNOW
20 #define clear_page(page) mmx_clear_page((void *)(page))
21 #define copy_page(to,from) mmx_copy_page(to,from)
26 * On older X86 processors it's not a win to use MMX here it seems.
30 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
31 #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
35 #define clear_user_page(page, vaddr, pg) clear_page(page)
36 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
38 #define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr)
39 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
42 * These are used to make use of C type-checking..
44 extern int nx_enabled;
46 extern unsigned long long __supported_pte_mask;
47 typedef struct { unsigned long pte_low, pte_high; } pte_t;
48 typedef struct { unsigned long long pmd; } pmd_t;
49 typedef struct { unsigned long long pgd; } pgd_t;
50 typedef struct { unsigned long long pgprot; } pgprot_t;
51 #define pmd_val(x) ((x).pmd)
52 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
53 #define __pmd(x) ((pmd_t) { (x) } )
54 #define HPAGE_SHIFT 21
55 #include <asm-generic/pgtable-nopud.h>
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
63 #include <asm-generic/pgtable-nopmd.h>
65 #define PTE_MASK PAGE_MASK
67 #ifdef CONFIG_HUGETLB_PAGE
68 #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
69 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
70 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
71 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
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.
101 struct vm_area_struct;
104 * This much address space is reserved for vmalloc() and iomap()
105 * as well as fixmap mappings.
107 extern unsigned int __VMALLOC_RESERVE;
109 extern int sysctl_legacy_va_layout;
111 extern int page_is_ram(unsigned long pagenr);
113 #endif /* __ASSEMBLY__ */
116 #define __PAGE_OFFSET CONFIG_PAGE_OFFSET
118 #define __PAGE_OFFSET ((unsigned long)CONFIG_PAGE_OFFSET)
122 #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
123 #define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE)
124 #define MAXMEM (-__PAGE_OFFSET-__VMALLOC_RESERVE)
125 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
126 /* __pa_symbol should be used for C visible symbols.
127 This seems to be the official gcc blessed way to do such arithmetic. */
128 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x),0))
129 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
130 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
131 #ifdef CONFIG_FLATMEM
132 #define pfn_valid(pfn) ((pfn) < max_mapnr)
133 #endif /* CONFIG_FLATMEM */
134 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
136 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
138 #define VM_DATA_DEFAULT_FLAGS \
139 (VM_READ | VM_WRITE | \
140 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
141 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
143 #include <asm-generic/memory_model.h>
144 #include <asm-generic/page.h>
146 #define __HAVE_ARCH_GATE_AREA 1
147 #endif /* __KERNEL__ */
149 #endif /* _I386_PAGE_H */