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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 _ASM_X86_PAGE_H
2#define _ASM_X86_PAGE_H
3
4#include <linux/const.h>
5
6/* PAGE_SHIFT determines the page size */
7#define PAGE_SHIFT 12
8#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
9#define PAGE_MASK (~(PAGE_SIZE-1))
10
11#ifdef __KERNEL__
12
13#define __PHYSICAL_MASK ((phys_addr_t)(1ULL << __PHYSICAL_MASK_SHIFT) - 1)
14#define __VIRTUAL_MASK ((1UL << __VIRTUAL_MASK_SHIFT) - 1)
15
16/* Cast PAGE_MASK to a signed type so that it is sign-extended if
17 virtual addresses are 32-bits but physical addresses are larger
18 (ie, 32-bit PAE). */
19#define PHYSICAL_PAGE_MASK (((signed long)PAGE_MASK) & __PHYSICAL_MASK)
20
21/* PTE_PFN_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */
22#define PTE_PFN_MASK ((pteval_t)PHYSICAL_PAGE_MASK)
23
24/* PTE_FLAGS_MASK extracts the flags from a (pte|pmd|pud|pgd)val_t */
25#define PTE_FLAGS_MASK (~PTE_PFN_MASK)
26
27#define PMD_PAGE_SIZE (_AC(1, UL) << PMD_SHIFT)
28#define PMD_PAGE_MASK (~(PMD_PAGE_SIZE-1))
29
30#define HPAGE_SHIFT PMD_SHIFT
31#define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT)
32#define HPAGE_MASK (~(HPAGE_SIZE - 1))
33#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
34
35#define HUGE_MAX_HSTATE 2
36
37#ifndef __ASSEMBLY__
38#include <linux/types.h>
39#endif
40
41#ifdef CONFIG_X86_64
42#include <asm/page_64.h>
43#else
44#include <asm/page_32.h>
45#endif /* CONFIG_X86_64 */
46
47#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
48
49#define VM_DATA_DEFAULT_FLAGS \
50 (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
51 VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
52
53
54#ifndef __ASSEMBLY__
55
56typedef struct { pgdval_t pgd; } pgd_t;
57typedef struct { pgprotval_t pgprot; } pgprot_t;
58
59extern int page_is_ram(unsigned long pagenr);
60extern int devmem_is_allowed(unsigned long pagenr);
61extern void map_devmem(unsigned long pfn, unsigned long size,
62 pgprot_t vma_prot);
63extern void unmap_devmem(unsigned long pfn, unsigned long size,
64 pgprot_t vma_prot);
65
66extern unsigned long max_low_pfn_mapped;
67extern unsigned long max_pfn_mapped;
68
69struct page;
70
71static inline void clear_user_page(void *page, unsigned long vaddr,
72 struct page *pg)
73{
74 clear_page(page);
75}
76
77static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
78 struct page *topage)
79{
80 copy_page(to, from);
81}
82
83#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
84 alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
85#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
86
87static inline pgd_t native_make_pgd(pgdval_t val)
88{
89 return (pgd_t) { val };
90}
91
92static inline pgdval_t native_pgd_val(pgd_t pgd)
93{
94 return pgd.pgd;
95}
96
97#if PAGETABLE_LEVELS >= 3
98#if PAGETABLE_LEVELS == 4
99typedef struct { pudval_t pud; } pud_t;
100
101static inline pud_t native_make_pud(pmdval_t val)
102{
103 return (pud_t) { val };
104}
105
106static inline pudval_t native_pud_val(pud_t pud)
107{
108 return pud.pud;
109}
110#else /* PAGETABLE_LEVELS == 3 */
111#include <asm-generic/pgtable-nopud.h>
112
113static inline pudval_t native_pud_val(pud_t pud)
114{
115 return native_pgd_val(pud.pgd);
116}
117#endif /* PAGETABLE_LEVELS == 4 */
118
119typedef struct { pmdval_t pmd; } pmd_t;
120
121static inline pmd_t native_make_pmd(pmdval_t val)
122{
123 return (pmd_t) { val };
124}
125
126static inline pmdval_t native_pmd_val(pmd_t pmd)
127{
128 return pmd.pmd;
129}
130#else /* PAGETABLE_LEVELS == 2 */
131#include <asm-generic/pgtable-nopmd.h>
132
133static inline pmdval_t native_pmd_val(pmd_t pmd)
134{
135 return native_pgd_val(pmd.pud.pgd);
136}
137#endif /* PAGETABLE_LEVELS >= 3 */
138
139static inline pte_t native_make_pte(pteval_t val)
140{
141 return (pte_t) { .pte = val };
142}
143
144static inline pteval_t native_pte_val(pte_t pte)
145{
146 return pte.pte;
147}
148
149static inline pteval_t native_pte_flags(pte_t pte)
150{
151 return native_pte_val(pte) & PTE_FLAGS_MASK;
152}
153
154#define pgprot_val(x) ((x).pgprot)
155#define __pgprot(x) ((pgprot_t) { (x) } )
156
157#ifdef CONFIG_PARAVIRT
158#include <asm/paravirt.h>
159#else /* !CONFIG_PARAVIRT */
160
161#define pgd_val(x) native_pgd_val(x)
162#define __pgd(x) native_make_pgd(x)
163
164#ifndef __PAGETABLE_PUD_FOLDED
165#define pud_val(x) native_pud_val(x)
166#define __pud(x) native_make_pud(x)
167#endif
168
169#ifndef __PAGETABLE_PMD_FOLDED
170#define pmd_val(x) native_pmd_val(x)
171#define __pmd(x) native_make_pmd(x)
172#endif
173
174#define pte_val(x) native_pte_val(x)
175#define pte_flags(x) native_pte_flags(x)
176#define __pte(x) native_make_pte(x)
177
178#endif /* CONFIG_PARAVIRT */
179
180#define __pa(x) __phys_addr((unsigned long)(x))
181/* __pa_symbol should be used for C visible symbols.
182 This seems to be the official gcc blessed way to do such arithmetic. */
183#define __pa_symbol(x) __pa(__phys_reloc_hide((unsigned long)(x)))
184
185#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
186
187#define __boot_va(x) __va(x)
188#define __boot_pa(x) __pa(x)
189
190#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
191#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
192#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
193
194#endif /* __ASSEMBLY__ */
195
196#include <asm-generic/memory_model.h>
197#include <asm-generic/page.h>
198
199#define __HAVE_ARCH_GATE_AREA 1
200
201#endif /* __KERNEL__ */
202#endif /* _ASM_X86_PAGE_H */