tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
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_PAGE_MASK (PAGE_MASK & __PHYSICAL_MASK)
14#define PTE_MASK (_AT(long, PHYSICAL_PAGE_MASK))
15
16#define LARGE_PAGE_SIZE (_AC(1,UL) << PMD_SHIFT)
17#define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
18
19#define HPAGE_SHIFT PMD_SHIFT
20#define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT)
21#define HPAGE_MASK (~(HPAGE_SIZE - 1))
22#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
23
24/* to align the pointer to the (next) page boundary */
25#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
26
27#define __PHYSICAL_MASK _AT(phys_addr_t, (_AC(1,ULL) << __PHYSICAL_MASK_SHIFT) - 1)
28#define __VIRTUAL_MASK ((_AC(1,UL) << __VIRTUAL_MASK_SHIFT) - 1)
29
30#ifndef __ASSEMBLY__
31#include <linux/types.h>
32#endif
33
34#ifdef CONFIG_X86_64
35#include <asm/page_64.h>
36#define max_pfn_mapped end_pfn_map
37#else
38#include <asm/page_32.h>
39#define max_pfn_mapped max_low_pfn
40#endif /* CONFIG_X86_64 */
41
42#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
43
44#define VM_DATA_DEFAULT_FLAGS \
45 (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
46 VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
47
48
49#ifndef __ASSEMBLY__
50
51extern int page_is_ram(unsigned long pagenr);
52
53struct page;
54
55static void inline clear_user_page(void *page, unsigned long vaddr,
56 struct page *pg)
57{
58 clear_page(page);
59}
60
61static void inline copy_user_page(void *to, void *from, unsigned long vaddr,
62 struct page *topage)
63{
64 copy_page(to, from);
65}
66
67#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
68 alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
69#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
70
71typedef struct { pgdval_t pgd; } pgd_t;
72typedef struct { pgprotval_t pgprot; } pgprot_t;
73
74static inline pgd_t native_make_pgd(pgdval_t val)
75{
76 return (pgd_t) { val };
77}
78
79static inline pgdval_t native_pgd_val(pgd_t pgd)
80{
81 return pgd.pgd;
82}
83
84#if PAGETABLE_LEVELS >= 3
85#if PAGETABLE_LEVELS == 4
86typedef struct { pudval_t pud; } pud_t;
87
88static inline pud_t native_make_pud(pmdval_t val)
89{
90 return (pud_t) { val };
91}
92
93static inline pudval_t native_pud_val(pud_t pud)
94{
95 return pud.pud;
96}
97#else /* PAGETABLE_LEVELS == 3 */
98#include <asm-generic/pgtable-nopud.h>
99
100static inline pudval_t native_pud_val(pud_t pud)
101{
102 return native_pgd_val(pud.pgd);
103}
104#endif /* PAGETABLE_LEVELS == 4 */
105
106typedef struct { pmdval_t pmd; } pmd_t;
107
108static inline pmd_t native_make_pmd(pmdval_t val)
109{
110 return (pmd_t) { val };
111}
112
113static inline pmdval_t native_pmd_val(pmd_t pmd)
114{
115 return pmd.pmd;
116}
117#else /* PAGETABLE_LEVELS == 2 */
118#include <asm-generic/pgtable-nopmd.h>
119
120static inline pmdval_t native_pmd_val(pmd_t pmd)
121{
122 return native_pgd_val(pmd.pud.pgd);
123}
124#endif /* PAGETABLE_LEVELS >= 3 */
125
126static inline pte_t native_make_pte(pteval_t val)
127{
128 return (pte_t) { .pte = val };
129}
130
131static inline pteval_t native_pte_val(pte_t pte)
132{
133 return pte.pte;
134}
135
136#define pgprot_val(x) ((x).pgprot)
137#define __pgprot(x) ((pgprot_t) { (x) } )
138
139#ifdef CONFIG_PARAVIRT
140#include <asm/paravirt.h>
141#else /* !CONFIG_PARAVIRT */
142
143#define pgd_val(x) native_pgd_val(x)
144#define __pgd(x) native_make_pgd(x)
145
146#ifndef __PAGETABLE_PUD_FOLDED
147#define pud_val(x) native_pud_val(x)
148#define __pud(x) native_make_pud(x)
149#endif
150
151#ifndef __PAGETABLE_PMD_FOLDED
152#define pmd_val(x) native_pmd_val(x)
153#define __pmd(x) native_make_pmd(x)
154#endif
155
156#define pte_val(x) native_pte_val(x)
157#define __pte(x) native_make_pte(x)
158
159#endif /* CONFIG_PARAVIRT */
160
161#define __pa(x) __phys_addr((unsigned long)(x))
162/* __pa_symbol should be used for C visible symbols.
163 This seems to be the official gcc blessed way to do such arithmetic. */
164#define __pa_symbol(x) __pa(__phys_reloc_hide((unsigned long)(x)))
165
166#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
167
168#define __boot_va(x) __va(x)
169#define __boot_pa(x) __pa(x)
170
171#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
172#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
173#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
174
175#endif /* __ASSEMBLY__ */
176
177#include <asm-generic/memory_model.h>
178#include <asm-generic/page.h>
179
180#define __HAVE_ARCH_GATE_AREA 1
181
182#endif /* __KERNEL__ */
183#endif /* _ASM_X86_PAGE_H */