Root/include/asm-generic/page.h

1#ifndef __ASM_GENERIC_PAGE_H
2#define __ASM_GENERIC_PAGE_H
3/*
4 * Generic page.h implementation, for NOMMU architectures.
5 * This provides the dummy definitions for the memory management.
6 */
7
8#ifdef CONFIG_MMU
9#error need to prove a real asm/page.h
10#endif
11
12
13/* PAGE_SHIFT determines the page size */
14
15#define PAGE_SHIFT 12
16#ifdef __ASSEMBLY__
17#define PAGE_SIZE (1 << PAGE_SHIFT)
18#else
19#define PAGE_SIZE (1UL << PAGE_SHIFT)
20#endif
21#define PAGE_MASK (~(PAGE_SIZE-1))
22
23#include <asm/setup.h>
24
25#ifndef __ASSEMBLY__
26
27#define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
28#define free_user_page(page, addr) free_page(addr)
29
30#define clear_page(page) memset((page), 0, PAGE_SIZE)
31#define copy_page(to,from) memcpy((to), (from), PAGE_SIZE)
32
33#define clear_user_page(page, vaddr, pg) clear_page(page)
34#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
35
36/*
37 * These are used to make use of C type-checking..
38 */
39typedef struct {
40    unsigned long pte;
41} pte_t;
42typedef struct {
43    unsigned long pmd[16];
44} pmd_t;
45typedef struct {
46    unsigned long pgd;
47} pgd_t;
48typedef struct {
49    unsigned long pgprot;
50} pgprot_t;
51typedef struct page *pgtable_t;
52
53#define pte_val(x) ((x).pte)
54#define pmd_val(x) ((&x)->pmd[0])
55#define pgd_val(x) ((x).pgd)
56#define pgprot_val(x) ((x).pgprot)
57
58#define __pte(x) ((pte_t) { (x) } )
59#define __pmd(x) ((pmd_t) { (x) } )
60#define __pgd(x) ((pgd_t) { (x) } )
61#define __pgprot(x) ((pgprot_t) { (x) } )
62
63extern unsigned long memory_start;
64extern unsigned long memory_end;
65
66#endif /* !__ASSEMBLY__ */
67
68#ifdef CONFIG_KERNEL_RAM_BASE_ADDRESS
69#define PAGE_OFFSET (CONFIG_KERNEL_RAM_BASE_ADDRESS)
70#else
71#define PAGE_OFFSET (0)
72#endif
73
74#ifndef __ASSEMBLY__
75
76#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
77#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
78
79#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
80#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
81
82#define virt_to_page(addr) (mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
83#define page_to_virt(page) ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
84
85#ifndef page_to_phys
86#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
87#endif
88
89#define pfn_valid(pfn) ((pfn) < max_mapnr)
90
91#define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
92                ((void *)(kaddr) < (void *)memory_end))
93
94#endif /* __ASSEMBLY__ */
95
96#include <asm-generic/memory_model.h>
97#include <asm-generic/getorder.h>
98
99#endif /* __ASM_GENERIC_PAGE_H */
100

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