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53 | 53 | ||
54 | #define PAGE_READ (1<<PAGE_READ_SHIFT) |
54 | #define PAGE_READ (1<<PAGE_READ_SHIFT) |
55 | #define PAGE_WRITE (1<<PAGE_WRITE_SHIFT) |
55 | #define PAGE_WRITE (1<<PAGE_WRITE_SHIFT) |
56 | #define PAGE_EXEC (1<<PAGE_EXEC_SHIFT) |
56 | #define PAGE_EXEC (1<<PAGE_EXEC_SHIFT) |
57 | 57 | ||
58 | /* |
- | |
- | 58 | struct page_operations { |
|
59 | * This is the generic 4-level page table interface. |
59 | void (* mapping_insert)(__address page, __address frame, int flags, __address root); |
60 | * Architectures are supposed to implement *_ARCH macros. |
60 | pte_t *(* mapping_find)(__address page, __address root); |
61 | */ |
61 | }; |
- | 62 | typedef struct page_operations page_operations_t; |
|
62 | 63 | ||
63 | /* |
- | |
64 | * These macros process vaddr and extract those portions |
- | |
65 | * of it that function as indices to respective page tables. |
- | |
66 | */ |
- | |
67 | #define PTL0_INDEX(vaddr) PTL0_INDEX_ARCH(vaddr) |
- | |
68 | #define PTL1_INDEX(vaddr) PTL1_INDEX_ARCH(vaddr) |
- | |
69 | #define PTL2_INDEX(vaddr) PTL2_INDEX_ARCH(vaddr) |
- | |
70 | #define PTL3_INDEX(vaddr) PTL3_INDEX_ARCH(vaddr) |
- | |
71 | - | ||
72 | #define GET_PTL0_ADDRESS() GET_PTL0_ADDRESS_ARCH() |
- | |
73 | #define SET_PTL0_ADDRESS(ptl0) SET_PTL0_ADDRESS_ARCH(ptl0) |
- | |
74 | - | ||
75 | /* |
- | |
76 | * These macros traverse the 4-level tree of page tables, |
- | |
77 | * each descending by one level. |
- | |
78 | */ |
- | |
79 | #define GET_PTL1_ADDRESS(ptl0, i) GET_PTL1_ADDRESS_ARCH(ptl0, i) |
- | |
80 | #define GET_PTL2_ADDRESS(ptl1, i) GET_PTL2_ADDRESS_ARCH(ptl1, i) |
- | |
81 | #define GET_PTL3_ADDRESS(ptl2, i) GET_PTL3_ADDRESS_ARCH(ptl2, i) |
- | |
82 | #define GET_FRAME_ADDRESS(ptl3, i) GET_FRAME_ADDRESS_ARCH(ptl3, i) |
- | |
83 | - | ||
84 | /* |
- | |
85 | * These macros are provided to change shape of the 4-level |
- | |
86 | * tree of page tables on respective level. |
64 | extern page_operations_t *page_operations; |
87 | */ |
- | |
88 | #define SET_PTL1_ADDRESS(ptl0, i, a) SET_PTL1_ADDRESS_ARCH(ptl0, i, a) |
- | |
89 | #define SET_PTL2_ADDRESS(ptl1, i, a) SET_PTL2_ADDRESS_ARCH(ptl1, i, a) |
- | |
90 | #define SET_PTL3_ADDRESS(ptl2, i, a) SET_PTL3_ADDRESS_ARCH(ptl2, i, a) |
- | |
91 | #define SET_FRAME_ADDRESS(ptl3, i, a) SET_FRAME_ADDRESS_ARCH(ptl3, i, a) |
- | |
92 | - | ||
93 | /* |
- | |
94 | * These macros are provided to query various flags within the page tables. |
- | |
95 | */ |
- | |
96 | #define GET_PTL1_FLAGS(ptl0, i) GET_PTL1_FLAGS_ARCH(ptl0, i) |
- | |
97 | #define GET_PTL2_FLAGS(ptl1, i) GET_PTL2_FLAGS_ARCH(ptl1, i) |
- | |
98 | #define GET_PTL3_FLAGS(ptl2, i) GET_PTL3_FLAGS_ARCH(ptl2, i) |
- | |
99 | #define GET_FRAME_FLAGS(ptl3, i) GET_FRAME_FLAGS_ARCH(ptl3, i) |
- | |
100 | - | ||
101 | /* |
- | |
102 | * These macros are provided to set/clear various flags within the page tables. |
- | |
103 | */ |
- | |
104 | #define SET_PTL1_FLAGS(ptl0, i, x) SET_PTL1_FLAGS_ARCH(ptl0, i, x) |
- | |
105 | #define SET_PTL2_FLAGS(ptl1, i, x) SET_PTL2_FLAGS_ARCH(ptl1, i, x) |
- | |
106 | #define SET_PTL3_FLAGS(ptl2, i, x) SET_PTL3_FLAGS_ARCH(ptl2, i, x) |
- | |
107 | #define SET_FRAME_FLAGS(ptl3, i, x) SET_FRAME_FLAGS_ARCH(ptl3, i, x) |
- | |
108 | 65 | ||
109 | extern void page_init(void); |
66 | extern void page_init(void); |
110 | extern void page_mapping_insert(__address page, __address frame, int flags, __address root); |
67 | extern void page_mapping_insert(__address page, __address frame, int flags, __address root); |
111 | extern pte_t *page_mapping_find(__address page, __address root); |
68 | extern pte_t *page_mapping_find(__address page, __address root); |
112 | extern void map_structure(__address s, size_t size); |
69 | extern void map_structure(__address s, size_t size); |