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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#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
99/*
100 * This much address space is reserved for vmalloc() and iomap()
101 * as well as fixmap mappings.
102 */
103extern unsigned int __VMALLOC_RESERVE;
104
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105extern int sysctl_legacy_va_layout;
106
Dave Hansen5b505b92005-06-23 00:07:41 -0700107extern int page_is_ram(unsigned long pagenr);
108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109#endif /* __ASSEMBLY__ */
110
111#ifdef __ASSEMBLY__
Mark Lord975b3d32006-02-01 03:06:11 -0800112#define __PAGE_OFFSET CONFIG_PAGE_OFFSET
Eric W. Biederman3d345e32005-06-25 14:57:49 -0700113#define __PHYSICAL_START CONFIG_PHYSICAL_START
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114#else
Mark Lord975b3d32006-02-01 03:06:11 -0800115#define __PAGE_OFFSET ((unsigned long)CONFIG_PAGE_OFFSET)
Eric W. Biederman3d345e32005-06-25 14:57:49 -0700116#define __PHYSICAL_START ((unsigned long)CONFIG_PHYSICAL_START)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117#endif
Eric W. Biederman3d345e32005-06-25 14:57:49 -0700118#define __KERNEL_START (__PAGE_OFFSET + __PHYSICAL_START)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120
121#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
122#define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE)
123#define MAXMEM (-__PAGE_OFFSET-__VMALLOC_RESERVE)
124#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
125#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
126#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
Andy Whitcroft05b79bd2005-06-23 00:07:57 -0700127#ifdef CONFIG_FLATMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128#define pfn_valid(pfn) ((pfn) < max_mapnr)
Andy Whitcroft05b79bd2005-06-23 00:07:57 -0700129#endif /* CONFIG_FLATMEM */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
131
132#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
133
134#define VM_DATA_DEFAULT_FLAGS \
135 (VM_READ | VM_WRITE | \
136 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
137 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
138
KAMEZAWA Hiroyukiad658b32006-03-27 01:15:33 -0800139#include <asm-generic/memory_model.h>
Stephen Rothwellfd4fd5a2005-09-03 15:54:30 -0700140#include <asm-generic/page.h>
141
David Woodhousecd469e02006-04-27 15:48:08 +0100142#endif /* __KERNEL__ */
143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144#endif /* _I386_PAGE_H */