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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef _I386_PAGE_H
2#define _I386_PAGE_H
3
4/* PAGE_SHIFT determines the page size */
5#define PAGE_SHIFT 12
6#define PAGE_SIZE (1UL << PAGE_SHIFT)
7#define PAGE_MASK (~(PAGE_SIZE-1))
8
9#define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
10#define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)
11
12#ifdef __KERNEL__
13#ifndef __ASSEMBLY__
14
15#include <linux/config.h>
16
17#ifdef CONFIG_X86_USE_3DNOW
18
19#include <asm/mmx.h>
20
21#define clear_page(page) mmx_clear_page((void *)(page))
22#define copy_page(to,from) mmx_copy_page(to,from)
23
24#else
25
26/*
27 * On older X86 processors it's not a win to use MMX here it seems.
28 * Maybe the K6-III ?
29 */
30
31#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
32#define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
33
34#endif
35
36#define clear_user_page(page, vaddr, pg) clear_page(page)
37#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
38
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
41
42/*
43 * These are used to make use of C type-checking..
44 */
45extern int nx_enabled;
46#ifdef CONFIG_X86_PAE
47extern unsigned long long __supported_pte_mask;
48typedef struct { unsigned long pte_low, pte_high; } pte_t;
49typedef struct { unsigned long long pmd; } pmd_t;
50typedef struct { unsigned long long pgd; } pgd_t;
51typedef 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
56#else
57typedef struct { unsigned long pte_low; } pte_t;
58typedef struct { unsigned long pgd; } pgd_t;
59typedef 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#endif
64#define PTE_MASK PAGE_MASK
65
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#endif
72
73#define pgd_val(x) ((x).pgd)
74#define pgprot_val(x) ((x).pgprot)
75
76#define __pte(x) ((pte_t) { (x) } )
77#define __pgd(x) ((pgd_t) { (x) } )
78#define __pgprot(x) ((pgprot_t) { (x) } )
79
80#endif /* !__ASSEMBLY__ */
81
82/* to align the pointer to the (next) page boundary */
83#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
84
85/*
86 * This handles the memory map.. We could make this a config
87 * option, but too many people screw it up, and too few need
88 * it.
89 *
90 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
91 * a virtual address space of one gigabyte, which limits the
92 * amount of physical memory you can use to about 950MB.
93 *
94 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
95 * and CONFIG_HIGHMEM64G options in the kernel configuration.
96 */
97
98#ifndef __ASSEMBLY__
99
100/*
101 * This much address space is reserved for vmalloc() and iomap()
102 * as well as fixmap mappings.
103 */
104extern unsigned int __VMALLOC_RESERVE;
105
106/* Pure 2^n version of get_order */
107static __inline__ int get_order(unsigned long size)
108{
109 int order;
110
111 size = (size-1) >> (PAGE_SHIFT-1);
112 order = -1;
113 do {
114 size >>= 1;
115 order++;
116 } while (size);
117 return order;
118}
119
120extern int sysctl_legacy_va_layout;
121
122#endif /* __ASSEMBLY__ */
123
124#ifdef __ASSEMBLY__
125#define __PAGE_OFFSET (0xC0000000)
126#else
127#define __PAGE_OFFSET (0xC0000000UL)
128#endif
129
130
131#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
132#define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE)
133#define MAXMEM (-__PAGE_OFFSET-__VMALLOC_RESERVE)
134#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
135#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
136#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
137#ifndef CONFIG_DISCONTIGMEM
138#define pfn_to_page(pfn) (mem_map + (pfn))
139#define page_to_pfn(page) ((unsigned long)((page) - mem_map))
140#define pfn_valid(pfn) ((pfn) < max_mapnr)
141#endif /* !CONFIG_DISCONTIGMEM */
142#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
143
144#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
145
146#define VM_DATA_DEFAULT_FLAGS \
147 (VM_READ | VM_WRITE | \
148 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
149 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
150
151#endif /* __KERNEL__ */
152
153#endif /* _I386_PAGE_H */