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
56 typedef struct { pgdval_t pgd; } pgd_t;
57 typedef struct { pgprotval_t pgprot; } pgprot_t;
58
59 extern int page_is_ram(unsigned long pagenr);
60 extern int devmem_is_allowed(unsigned long pagenr);
61 extern void map_devmem(unsigned long pfn, unsigned long size,
62 pgprot_t vma_prot);
63 extern void unmap_devmem(unsigned long pfn, unsigned long size,
64 pgprot_t vma_prot);
65
66 extern unsigned long max_low_pfn_mapped;
67 extern unsigned long max_pfn_mapped;
68
69 struct page;
70
clear_user_page(void * page,unsigned long vaddr,struct page * pg)71 static inline void clear_user_page(void *page, unsigned long vaddr,
72 struct page *pg)
73 {
74 clear_page(page);
75 }
76
copy_user_page(void * to,void * from,unsigned long vaddr,struct page * topage)77 static 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
native_make_pgd(pgdval_t val)87 static inline pgd_t native_make_pgd(pgdval_t val)
88 {
89 return (pgd_t) { val };
90 }
91
native_pgd_val(pgd_t pgd)92 static 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
99 typedef struct { pudval_t pud; } pud_t;
100
native_make_pud(pmdval_t val)101 static inline pud_t native_make_pud(pmdval_t val)
102 {
103 return (pud_t) { val };
104 }
105
native_pud_val(pud_t pud)106 static 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
native_pud_val(pud_t pud)113 static inline pudval_t native_pud_val(pud_t pud)
114 {
115 return native_pgd_val(pud.pgd);
116 }
117 #endif /* PAGETABLE_LEVELS == 4 */
118
119 typedef struct { pmdval_t pmd; } pmd_t;
120
native_make_pmd(pmdval_t val)121 static inline pmd_t native_make_pmd(pmdval_t val)
122 {
123 return (pmd_t) { val };
124 }
125
native_pmd_val(pmd_t pmd)126 static 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
native_pmd_val(pmd_t pmd)133 static 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
native_make_pte(pteval_t val)139 static inline pte_t native_make_pte(pteval_t val)
140 {
141 return (pte_t) { .pte = val };
142 }
143
native_pte_val(pte_t pte)144 static inline pteval_t native_pte_val(pte_t pte)
145 {
146 return pte.pte;
147 }
148
native_pte_flags(pte_t pte)149 static 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 #define __pa_nodebug(x) __phys_addr_nodebug((unsigned long)(x))
182 /* __pa_symbol should be used for C visible symbols.
183 This seems to be the official gcc blessed way to do such arithmetic. */
184 #define __pa_symbol(x) __pa(__phys_reloc_hide((unsigned long)(x)))
185
186 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
187
188 #define __boot_va(x) __va(x)
189 #define __boot_pa(x) __pa(x)
190
191 /*
192 * virt_to_page(kaddr) returns a valid pointer if and only if
193 * virt_addr_valid(kaddr) returns true.
194 */
195 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
196 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
197 extern bool __virt_addr_valid(unsigned long kaddr);
198 #define virt_addr_valid(kaddr) __virt_addr_valid((unsigned long) (kaddr))
199
200 #endif /* __ASSEMBLY__ */
201
202 #include <asm-generic/memory_model.h>
203 #include <asm-generic/page.h>
204
205 #define __HAVE_ARCH_GATE_AREA 1
206
207 #endif /* __KERNEL__ */
208 #endif /* _ASM_X86_PAGE_H */
209