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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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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
16#ifdef CONFIG_X86_USE_3DNOW
17
18#include <asm/mmx.h>
19
20#define clear_page(page) mmx_clear_page((void *)(page))
21#define copy_page(to,from) mmx_copy_page(to,from)
22
23#else
24
25/*
26 * On older X86 processors it's not a win to use MMX here it seems.
27 * Maybe the K6-III ?
28 */
29
30#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
31#define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
32
33#endif
34
35#define clear_user_page(page, vaddr, pg) clear_page(page)
36#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
37
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
40
41/*
42 * These are used to make use of C type-checking..
43 */
44extern int nx_enabled;
45#ifdef CONFIG_X86_PAE
46extern unsigned long long __supported_pte_mask;
47typedef struct { unsigned long pte_low, pte_high; } pte_t;
48typedef struct { unsigned long long pmd; } pmd_t;
49typedef struct { unsigned long long pgd; } pgd_t;
50typedef 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#else
56typedef struct { unsigned long pte_low; } pte_t;
57typedef struct { unsigned long pgd; } pgd_t;
58typedef struct { unsigned long pgprot; } pgprot_t;
59#define boot_pte_t pte_t /* or would you rather have a typedef */
60#define pte_val(x) ((x).pte_low)
61#define HPAGE_SHIFT 22
62#endif
63#define PTE_MASK PAGE_MASK
64
65#ifdef CONFIG_HUGETLB_PAGE
66#define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
67#define HPAGE_MASK (~(HPAGE_SIZE - 1))
68#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
69#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
70#endif
71
72#define pgd_val(x) ((x).pgd)
73#define pgprot_val(x) ((x).pgprot)
74
75#define __pte(x) ((pte_t) { (x) } )
76#define __pgd(x) ((pgd_t) { (x) } )
77#define __pgprot(x) ((pgprot_t) { (x) } )
78
79#endif /* !__ASSEMBLY__ */
80
81/* to align the pointer to the (next) page boundary */
82#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
83
84/*
85 * This handles the memory map.. We could make this a config
86 * option, but too many people screw it up, and too few need
87 * it.
88 *
89 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
90 * a virtual address space of one gigabyte, which limits the
91 * amount of physical memory you can use to about 950MB.
92 *
93 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
94 * and CONFIG_HIGHMEM64G options in the kernel configuration.
95 */
96
97#ifndef __ASSEMBLY__
98
99struct vm_area_struct;
100
101/*
102 * This much address space is reserved for vmalloc() and iomap()
103 * as well as fixmap mappings.
104 */
105extern unsigned int __VMALLOC_RESERVE;
106
107extern int sysctl_legacy_va_layout;
108
109extern int page_is_ram(unsigned long pagenr);
110
111#endif /* __ASSEMBLY__ */
112
113#ifdef __ASSEMBLY__
114#define __PAGE_OFFSET CONFIG_PAGE_OFFSET
115#define __PHYSICAL_START CONFIG_PHYSICAL_START
116#else
117#define __PAGE_OFFSET ((unsigned long)CONFIG_PAGE_OFFSET)
118#define __PHYSICAL_START ((unsigned long)CONFIG_PHYSICAL_START)
119#endif
120#define __KERNEL_START (__PAGE_OFFSET + __PHYSICAL_START)
121
122
123#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
124#define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE)
125#define MAXMEM (-__PAGE_OFFSET-__VMALLOC_RESERVE)
126#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
127#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
128#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
129#ifdef CONFIG_FLATMEM
130#define pfn_valid(pfn) ((pfn) < max_mapnr)
131#endif /* CONFIG_FLATMEM */
132#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
133
134#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
135
136#define VM_DATA_DEFAULT_FLAGS \
137 (VM_READ | VM_WRITE | \
138 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
139 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
140
141#include <asm-generic/memory_model.h>
142#include <asm-generic/page.h>
143
144#define __HAVE_ARCH_GATE_AREA 1
145#endif /* __KERNEL__ */
146
147#endif /* _I386_PAGE_H */