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 */
39 typedef struct {
40 unsigned long pte;
41 } pte_t;
42 typedef struct {
43 unsigned long pmd[16];
44 } pmd_t;
45 typedef struct {
46 unsigned long pgd;
47 } pgd_t;
48 typedef struct {
49 unsigned long pgprot;
50 } pgprot_t;
51 typedef 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
63 extern unsigned long memory_start;
64 extern 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 ARCH_PFN_OFFSET
75 #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
76 #endif
77
78 #ifndef __ASSEMBLY__
79
80 #define __va(x) ((void *)((unsigned long) (x)))
81 #define __pa(x) ((unsigned long) (x))
82
83 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
84 #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
85
86 #define virt_to_page(addr) pfn_to_page(virt_to_pfn(addr))
87 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page))
88
89 #ifndef page_to_phys
90 #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
91 #endif
92
93 #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
94
95 #define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
96 ((void *)(kaddr) < (void *)memory_end))
97
98 #endif /* __ASSEMBLY__ */
99
100 #include <asm-generic/memory_model.h>
101 #include <asm-generic/getorder.h>
102
103 #endif /* __ASM_GENERIC_PAGE_H */
104
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