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/string.h>
17 #ifdef CONFIG_X86_USE_3DNOW
21 static inline void clear_page(void *page)
26 static inline void copy_page(void *to, void *from)
28 mmx_copy_page(to, from);
34 * On older X86 processors it's not a win to use MMX here it seems.
38 static inline void clear_page(void *page)
40 memset(page, 0, PAGE_SIZE);
43 static inline void copy_page(void *to, void *from)
45 memcpy(to, from, PAGE_SIZE);
52 static void inline clear_user_page(void *page, unsigned long vaddr,
58 static void inline copy_user_page(void *to, void *from, unsigned long vaddr,
64 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
65 alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
66 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
69 * These are used to make use of C type-checking..
71 extern int nx_enabled;
74 typedef struct { unsigned long pte_low, pte_high; } pte_t;
75 typedef struct { unsigned long long pmd; } pmd_t;
76 typedef struct { unsigned long long pgd; } pgd_t;
77 typedef struct { unsigned long long pgprot; } pgprot_t;
79 static inline unsigned long long native_pgd_val(pgd_t pgd)
84 static inline unsigned long long native_pmd_val(pmd_t pmd)
89 static inline unsigned long long native_pte_val(pte_t pte)
91 return pte.pte_low | ((unsigned long long)pte.pte_high << 32);
94 static inline pgd_t native_make_pgd(unsigned long long val)
96 return (pgd_t) { val };
99 static inline pmd_t native_make_pmd(unsigned long long val)
101 return (pmd_t) { val };
104 static inline pte_t native_make_pte(unsigned long long val)
106 return (pte_t) { .pte_low = val, .pte_high = (val >> 32) } ;
109 #ifndef CONFIG_PARAVIRT
110 #define pmd_val(x) native_pmd_val(x)
111 #define __pmd(x) native_make_pmd(x)
114 #define HPAGE_SHIFT 21
115 #include <asm-generic/pgtable-nopud.h>
116 #else /* !CONFIG_X86_PAE */
117 typedef struct { unsigned long pte_low; } pte_t;
118 typedef struct { unsigned long pgd; } pgd_t;
119 typedef struct { unsigned long pgprot; } pgprot_t;
120 #define boot_pte_t pte_t /* or would you rather have a typedef */
122 static inline unsigned long native_pgd_val(pgd_t pgd)
127 static inline unsigned long native_pte_val(pte_t pte)
132 static inline pgd_t native_make_pgd(unsigned long val)
134 return (pgd_t) { val };
137 static inline pte_t native_make_pte(unsigned long val)
139 return (pte_t) { .pte_low = val };
142 #define HPAGE_SHIFT 22
143 #include <asm-generic/pgtable-nopmd.h>
144 #endif /* CONFIG_X86_PAE */
146 #define PTE_MASK PAGE_MASK
148 #ifdef CONFIG_HUGETLB_PAGE
149 #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
150 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
151 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
152 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
155 #define pgprot_val(x) ((x).pgprot)
156 #define __pgprot(x) ((pgprot_t) { (x) } )
158 #ifndef CONFIG_PARAVIRT
159 #define pgd_val(x) native_pgd_val(x)
160 #define __pgd(x) native_make_pgd(x)
161 #define pte_val(x) native_pte_val(x)
162 #define __pte(x) native_make_pte(x)
165 #endif /* !__ASSEMBLY__ */
167 /* to align the pointer to the (next) page boundary */
168 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
171 * This handles the memory map.. We could make this a config
172 * option, but too many people screw it up, and too few need
175 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
176 * a virtual address space of one gigabyte, which limits the
177 * amount of physical memory you can use to about 950MB.
179 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
180 * and CONFIG_HIGHMEM64G options in the kernel configuration.
185 struct vm_area_struct;
188 * This much address space is reserved for vmalloc() and iomap()
189 * as well as fixmap mappings.
191 extern unsigned int __VMALLOC_RESERVE;
193 extern int sysctl_legacy_va_layout;
195 extern int page_is_ram(unsigned long pagenr);
197 #endif /* __ASSEMBLY__ */
200 #define __PAGE_OFFSET CONFIG_PAGE_OFFSET
202 #define __PAGE_OFFSET ((unsigned long)CONFIG_PAGE_OFFSET)
206 #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
207 #define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE)
208 #define MAXMEM (-__PAGE_OFFSET-__VMALLOC_RESERVE)
209 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
210 /* __pa_symbol should be used for C visible symbols.
211 This seems to be the official gcc blessed way to do such arithmetic. */
212 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x),0))
213 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
214 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
215 #ifdef CONFIG_FLATMEM
216 #define pfn_valid(pfn) ((pfn) < max_mapnr)
217 #endif /* CONFIG_FLATMEM */
218 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
220 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
222 #define VM_DATA_DEFAULT_FLAGS \
223 (VM_READ | VM_WRITE | \
224 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
225 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
227 #include <asm-generic/memory_model.h>
228 #include <asm-generic/page.h>
230 #define __HAVE_ARCH_GATE_AREA 1
231 #endif /* __KERNEL__ */
233 #endif /* _I386_PAGE_H */