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Linux kernel mirror (for testing)
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1#ifndef _ASM_PAGE_H
2#define _ASM_PAGE_H
3
4#ifdef __KERNEL__
5
6#include <linux/config.h>
7#include <asm/virtconvert.h>
8#include <asm/mem-layout.h>
9#include <asm/sections.h>
10#include <asm/setup.h>
11
12#ifndef __ASSEMBLY__
13
14#define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
15#define free_user_page(page, addr) free_page(addr)
16
17#define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
18#define copy_page(to,from) memcpy((to), (from), PAGE_SIZE)
19
20#define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
21#define copy_user_page(vto, vfrom, vaddr, topg) memcpy((vto), (vfrom), PAGE_SIZE)
22
23/*
24 * These are used to make use of C type-checking..
25 */
26typedef struct { unsigned long pte; } pte_t;
27typedef struct { unsigned long ste[64];} pmd_t;
28typedef struct { pmd_t pue[1]; } pud_t;
29typedef struct { pud_t pge[1]; } pgd_t;
30typedef struct { unsigned long pgprot; } pgprot_t;
31
32#define pte_val(x) ((x).pte)
33#define pmd_val(x) ((x).ste[0])
34#define pud_val(x) ((x).pue[0])
35#define pgd_val(x) ((x).pge[0])
36#define pgprot_val(x) ((x).pgprot)
37
38#define __pte(x) ((pte_t) { (x) } )
39#define __pmd(x) ((pmd_t) { (x) } )
40#define __pud(x) ((pud_t) { (x) } )
41#define __pgd(x) ((pgd_t) { (x) } )
42#define __pgprot(x) ((pgprot_t) { (x) } )
43#define PTE_MASK PAGE_MASK
44
45/* to align the pointer to the (next) page boundary */
46#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
47
48#define devmem_is_allowed(pfn) 1
49
50#define __pa(vaddr) virt_to_phys((void *) (unsigned long) (vaddr))
51#define __va(paddr) phys_to_virt((unsigned long) (paddr))
52
53#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
54
55extern unsigned long max_low_pfn;
56extern unsigned long min_low_pfn;
57extern unsigned long max_pfn;
58
59#ifdef CONFIG_MMU
60#define pfn_to_page(pfn) (mem_map + (pfn))
61#define page_to_pfn(page) ((unsigned long) ((page) - mem_map))
62#define pfn_valid(pfn) ((pfn) < max_mapnr)
63
64#else
65#define pfn_to_page(pfn) (&mem_map[(pfn) - (PAGE_OFFSET >> PAGE_SHIFT)])
66#define page_to_pfn(page) ((PAGE_OFFSET >> PAGE_SHIFT) + (unsigned long) ((page) - mem_map))
67#define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
68
69#endif
70
71#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
72#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
73
74
75#ifdef CONFIG_MMU
76#define VM_DATA_DEFAULT_FLAGS \
77 (VM_READ | VM_WRITE | \
78 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
79 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
80#endif
81
82#endif /* __ASSEMBLY__ */
83
84#endif /* __KERNEL__ */
85
86#ifdef CONFIG_CONTIGUOUS_PAGE_ALLOC
87#define WANT_PAGE_VIRTUAL 1
88#endif
89
90#include <asm-generic/page.h>
91
92#endif /* _ASM_PAGE_H */