4 #include <linux/config.h>
6 /* PAGE_SHIFT determines the page size */
8 #define PAGE_SIZE (1UL << PAGE_SHIFT)
9 #define PAGE_MASK (~(PAGE_SIZE-1))
11 #define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
12 #define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)
14 #include <linux/config.h>
18 #ifdef CONFIG_X86_USE_3DNOW
22 #define clear_page(page) mmx_clear_page((void *)(page))
23 #define copy_page(to,from) mmx_copy_page(to,from)
28 * On older X86 processors it's not a win to use MMX here it seems.
32 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
33 #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
37 #define clear_user_page(page, vaddr, pg) clear_page(page)
38 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
41 * These are used to make use of C type-checking..
44 typedef struct { unsigned long pte_low, pte_high; } pte_t;
45 typedef struct { unsigned long long pmd; } pmd_t;
46 typedef struct { unsigned long long pgd; } pgd_t;
47 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
48 #define HPAGE_SHIFT 21
50 typedef struct { unsigned long pte_low; } pte_t;
51 typedef struct { unsigned long pmd; } pmd_t;
52 typedef struct { unsigned long pgd; } pgd_t;
53 #define boot_pte_t pte_t /* or would you rather have a typedef */
54 #define pte_val(x) ((x).pte_low)
55 #define HPAGE_SHIFT 22
57 #define PTE_MASK PAGE_MASK
59 #ifdef CONFIG_HUGETLB_PAGE
60 #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
61 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
62 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
65 typedef struct { unsigned long pgprot; } pgprot_t;
67 #define pmd_val(x) ((x).pmd)
68 #define pgd_val(x) ((x).pgd)
69 #define pgprot_val(x) ((x).pgprot)
71 #define __pte(x) ((pte_t) { (x) } )
72 #define __pmd(x) ((pmd_t) { (x) } )
73 #define __pgd(x) ((pgd_t) { (x) } )
74 #define __pgprot(x) ((pgprot_t) { (x) } )
76 #endif /* !__ASSEMBLY__ */
78 /* to align the pointer to the (next) page boundary */
79 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
82 * This handles the memory map.. We could make this a config
83 * option, but too many people screw it up, and too few need
86 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
87 * a virtual address space of one gigabyte, which limits the
88 * amount of physical memory you can use to about 950MB.
90 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
91 * and CONFIG_HIGHMEM64G options in the kernel configuration.
93 * Note: on PAE the kernel must never go below 32 MB, we use the
94 * first 8 entries of the 2-level boot pgd for PAE magic.
97 #ifdef CONFIG_X86_4G_VM_LAYOUT
98 #define __PAGE_OFFSET (0x02000000)
99 #define TASK_SIZE (0xff000000)
101 #define __PAGE_OFFSET (0xc0000000)
102 #define TASK_SIZE (0xc0000000)
106 * This much address space is reserved for vmalloc() and iomap()
107 * as well as fixmap mappings.
109 #define __VMALLOC_RESERVE (128 << 20)
113 /* Pure 2^n version of get_order */
114 static __inline__ int get_order(unsigned long size)
118 size = (size-1) >> (PAGE_SHIFT-1);
127 #endif /* __ASSEMBLY__ */
129 #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
130 #define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE)
131 #define __MAXMEM (-__PAGE_OFFSET-__VMALLOC_RESERVE)
132 #define MAXMEM ((unsigned long)(-PAGE_OFFSET-VMALLOC_RESERVE))
133 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
134 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
135 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
136 #ifndef CONFIG_DISCONTIGMEM
137 #define pfn_to_page(pfn) (mem_map + (pfn))
138 #define page_to_pfn(page) ((unsigned long)((page) - mem_map))
139 #define pfn_valid(pfn) ((pfn) < max_mapnr)
140 #endif /* !CONFIG_DISCONTIGMEM */
141 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
143 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
145 #define VM_DATA_DEFAULT_FLAGS \
146 (VM_READ | VM_WRITE | \
147 ((current->flags & PF_RELOCEXEC) ? 0 : VM_EXEC) | \
148 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
150 #endif /* __KERNEL__ */
152 #endif /* _I386_PAGE_H */