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5c01b46b AB |
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 __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 */ |