summaryrefslogtreecommitdiffstats
path: root/include/asm-x86/page_32.h
blob: 80ecc66b6d8647c901c5d7038bae1267b9219c26 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
#ifndef _I386_PAGE_H
#define _I386_PAGE_H

/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT	12
#define PAGE_SIZE	(1UL << PAGE_SHIFT)
#define PAGE_MASK	(~(PAGE_SIZE-1))

#define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
#define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)

#ifdef __KERNEL__
#ifndef __ASSEMBLY__

#ifdef CONFIG_X86_USE_3DNOW

#include <asm/mmx.h>

#define clear_page(page)	mmx_clear_page((void *)(page))
#define copy_page(to,from)	mmx_copy_page(to,from)

#else

/*
 *	On older X86 processors it's not a win to use MMX here it seems.
 *	Maybe the K6-III ?
 */
 
#define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
#define copy_page(to,from)	memcpy((void *)(to), (void *)(from), PAGE_SIZE)

#endif

#define clear_user_page(page, vaddr, pg)	clear_page(page)
#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)

#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
	alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE

/*
 * These are used to make use of C type-checking..
 */
extern int nx_enabled;

#ifdef CONFIG_X86_PAE
typedef struct { unsigned long pte_low, pte_high; } pte_t;
typedef struct { unsigned long long pmd; } pmd_t;
typedef struct { unsigned long long pgd; } pgd_t;
typedef struct { unsigned long long pgprot; } pgprot_t;

static inline unsigned long long native_pgd_val(pgd_t pgd)
{
	return pgd.pgd;
}

static inline unsigned long long native_pmd_val(pmd_t pmd)
{
	return pmd.pmd;
}

static inline unsigned long long native_pte_val(pte_t pte)
{
	return pte.pte_low | ((unsigned long long)pte.pte_high << 32);
}

static inline pgd_t native_make_pgd(unsigned long long val)
{
	return (pgd_t) { val };
}

static inline pmd_t native_make_pmd(unsigned long long val)
{
	return (pmd_t) { val };
}

static inline pte_t native_make_pte(unsigned long long val)
{
	return (pte_t) { .pte_low = val, .pte_high = (val >> 32) } ;
}

#ifndef CONFIG_PARAVIRT
#define pmd_val(x)	native_pmd_val(x)
#define __pmd(x)	native_make_pmd(x)
#endif

#define HPAGE_SHIFT	21
#include <asm-generic/pgtable-nopud.h>
#else  /* !CONFIG_X86_PAE */
typedef struct { unsigned long pte_low; } pte_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;
#define boot_pte_t pte_t /* or would you rather have a typedef */

static inline unsigned long native_pgd_val(pgd_t pgd)
{
	return pgd.pgd;
}

static inline unsigned long native_pte_val(pte_t pte)
{
	return pte.pte_low;
}

static inline pgd_t native_make_pgd(unsigned long val)
{
	return (pgd_t) { val };
}

static inline pte_t native_make_pte(unsigned long val)
{
	return (pte_t) { .pte_low = val };
}

#define HPAGE_SHIFT	22
#include <asm-generic/pgtable-nopmd.h>
#endif	/* CONFIG_X86_PAE */

#define PTE_MASK	PAGE_MASK

#ifdef CONFIG_HUGETLB_PAGE
#define HPAGE_SIZE	((1UL) << HPAGE_SHIFT)
#define HPAGE_MASK	(~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
#endif

#define pgprot_val(x)	((x).pgprot)
#define __pgprot(x)	((pgprot_t) { (x) } )

#ifndef CONFIG_PARAVIRT
#define pgd_val(x)	native_pgd_val(x)
#define __pgd(x)	native_make_pgd(x)
#define pte_val(x)	native_pte_val(x)
#define __pte(x)	native_make_pte(x)
#endif

#endif /* !__ASSEMBLY__ */

/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE-1)&PAGE_MASK)

/*
 * This handles the memory map.. We could make this a config
 * option, but too many people screw it up, and too few need
 * it.
 *
 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
 * a virtual address space of one gigabyte, which limits the
 * amount of physical memory you can use to about 950MB. 
 *
 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
 * and CONFIG_HIGHMEM64G options in the kernel configuration.
 */

#ifndef __ASSEMBLY__

struct vm_area_struct;

/*
 * This much address space is reserved for vmalloc() and iomap()
 * as well as fixmap mappings.
 */
extern unsigned int __VMALLOC_RESERVE;

extern int sysctl_legacy_va_layout;

extern int page_is_ram(unsigned long pagenr);

#endif /* __ASSEMBLY__ */

#ifdef __ASSEMBLY__
#define __PAGE_OFFSET		CONFIG_PAGE_OFFSET
#else
#define __PAGE_OFFSET		((unsigned long)CONFIG_PAGE_OFFSET)
#endif


#define PAGE_OFFSET		((unsigned long)__PAGE_OFFSET)
#define VMALLOC_RESERVE		((unsigned long)__VMALLOC_RESERVE)
#define MAXMEM			(-__PAGE_OFFSET-__VMALLOC_RESERVE)
#define __pa(x)			((unsigned long)(x)-PAGE_OFFSET)
/* __pa_symbol should be used for C visible symbols.
   This seems to be the official gcc blessed way to do such arithmetic. */
#define __pa_symbol(x)          __pa(RELOC_HIDE((unsigned long)(x),0))
#define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))
#define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
#ifdef CONFIG_FLATMEM
#define pfn_valid(pfn)		((pfn) < max_mapnr)
#endif /* CONFIG_FLATMEM */
#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)

#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

#define VM_DATA_DEFAULT_FLAGS \
	(VM_READ | VM_WRITE | \
	((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
		 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#include <asm-generic/memory_model.h>
#include <asm-generic/page.h>

#define __HAVE_ARCH_GATE_AREA 1
#endif /* __KERNEL__ */

#endif /* _I386_PAGE_H */
OpenPOWER on IntegriCloud