1 #ifndef _ASM_X86_PAGE_32_H
2 #define _ASM_X86_PAGE_32_H
5 * This handles the memory map.
7 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
8 * a virtual address space of one gigabyte, which limits the
9 * amount of physical memory you can use to about 950MB.
11 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
12 * and CONFIG_HIGHMEM64G options in the kernel configuration.
14 #define __PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
17 #define __PHYSICAL_MASK_SHIFT 36
18 #define __VIRTUAL_MASK_SHIFT 32
19 #define PAGETABLE_LEVELS 3
26 typedef u64 pgprotval_t;
27 typedef u64 phys_addr_t;
29 typedef struct { unsigned long pte_low, pte_high; } pte_t;
31 static inline unsigned long long native_pte_val(pte_t pte)
33 return pte.pte_low | ((unsigned long long)pte.pte_high << 32);
36 static inline pte_t native_make_pte(unsigned long long val)
38 return (pte_t) { .pte_low = val, .pte_high = (val >> 32) } ;
41 #endif /* __ASSEMBLY__
43 #else /* !CONFIG_X86_PAE */
44 #define __PHYSICAL_MASK_SHIFT 32
45 #define __VIRTUAL_MASK_SHIFT 32
46 #define PAGETABLE_LEVELS 2
49 typedef unsigned long pteval_t;
50 typedef unsigned long pmdval_t;
51 typedef unsigned long pudval_t;
52 typedef unsigned long pgdval_t;
53 typedef unsigned long pgprotval_t;
54 typedef unsigned long phys_addr_t;
56 typedef struct { pteval_t pte_low; } pte_t;
57 typedef pte_t boot_pte_t;
59 static inline unsigned long native_pte_val(pte_t pte)
64 static inline pte_t native_make_pte(unsigned long val)
66 return (pte_t) { .pte_low = val };
69 #endif /* __ASSEMBLY__ */
70 #endif /* CONFIG_X86_PAE */
72 #ifdef CONFIG_HUGETLB_PAGE
73 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
77 #define __phys_addr(x) ((x)-PAGE_OFFSET)
78 #define __phys_reloc_hide(x) RELOC_HIDE((x), 0)
81 #define pfn_valid(pfn) ((pfn) < max_mapnr)
82 #endif /* CONFIG_FLATMEM */
84 extern int nx_enabled;
87 * This much address space is reserved for vmalloc() and iomap()
88 * as well as fixmap mappings.
90 extern unsigned int __VMALLOC_RESERVE;
91 extern int sysctl_legacy_va_layout;
92 extern int page_is_ram(unsigned long pagenr);
94 #define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE)
95 #define MAXMEM (-__PAGE_OFFSET-__VMALLOC_RESERVE)
97 #ifdef CONFIG_X86_USE_3DNOW
100 static inline void clear_page(void *page)
102 mmx_clear_page(page);
105 static inline void copy_page(void *to, void *from)
107 mmx_copy_page(to, from);
109 #else /* !CONFIG_X86_USE_3DNOW */
110 #include <linux/string.h>
112 static inline void clear_page(void *page)
114 memset(page, 0, PAGE_SIZE);
117 static inline void copy_page(void *to, void *from)
119 memcpy(to, from, PAGE_SIZE);
121 #endif /* CONFIG_X86_3DNOW */
122 #endif /* !__ASSEMBLY__ */
124 #endif /* _ASM_X86_PAGE_32_H */