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1 | /* |
1 | /* |
2 | * Copyright (c) 2003-2007 Jakub Jermar |
2 | * Copyright (c) 2007 Pavel Jancik, Michal Kebrt |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
Line 66... | Line 66... | ||
66 | typedef uint32_t context_id_t; |
66 | typedef uint32_t context_id_t; |
67 | 67 | ||
68 | typedef int32_t inr_t; |
68 | typedef int32_t inr_t; |
69 | typedef int32_t devno_t; |
69 | typedef int32_t devno_t; |
70 | 70 | ||
71 | /** Page Table Entry. */ |
71 | /** Page table entry. |
- | 72 | * |
|
- | 73 | * We have different structs for level 0 and level 1 page table entries. |
|
- | 74 | * */ |
|
72 | typedef struct { |
75 | typedef struct { |
73 | /**PageTables are so different that we have different types |
- | |
74 | * for level 0 and level1 page table entries |
- | |
75 | */ |
- | |
76 | unsigned dummy : 32; |
76 | unsigned dummy : 32; |
77 | } pte_t; |
77 | } pte_t; |
78 | 78 | ||
- | 79 | /** Level 0 page table entry. */ |
|
79 | typedef struct { |
80 | typedef struct { |
- | 81 | /* 01b for coarse tables, see below for details */ |
|
80 | unsigned descriptor_type : 2; |
82 | unsigned descriptor_type : 2; |
81 | unsigned machine_depend : 3; // Alf: ???? v Architecture previev neni vyznam definovan |
83 | unsigned impl_specific : 3; |
82 | unsigned domain : 4; |
84 | unsigned domain : 4; |
83 | unsigned should_be_zero : 1; |
85 | unsigned should_be_zero : 1; |
- | 86 | /* Pointer to the coarse 2nd level page table (holding entries for small (4KB) |
|
- | 87 | * or large (64KB) pages. ARM also supports fine 2nd level page tables that |
|
- | 88 | * may hold even tiny pages (1KB) but they are bigger (4KB per table in comparison |
|
- | 89 | * with 1KB per the coarse table) |
|
- | 90 | */ |
|
84 | unsigned coarse_table_addr : 22; |
91 | unsigned coarse_table_addr : 22; |
85 | } __attribute__ ((packed)) pte_level0_t; |
92 | } __attribute__ ((packed)) pte_level0_t; |
86 | 93 | ||
87 | //TODO Alf: Comments |
94 | /** Level 1 page table entry (small (4KB) pages used) */ |
88 | typedef struct { |
95 | typedef struct { |
- | 96 | /* 0b10 for small pages */ |
|
89 | unsigned descriptor_type : 2; |
97 | unsigned descriptor_type : 2; |
90 | unsigned bufferable : 1; |
98 | unsigned bufferable : 1; |
91 | unsigned cacheable : 1; |
99 | unsigned cacheable : 1; |
- | 100 | /* access permissions for each of 4 subparts of a page |
|
- | 101 | * (for each 1KB when small pages used */ |
|
92 | unsigned access_permission_0 : 2; |
102 | unsigned access_permission_0 : 2; |
93 | unsigned access_permission_1 : 2; |
103 | unsigned access_permission_1 : 2; |
94 | unsigned access_permission_2 : 2; |
104 | unsigned access_permission_2 : 2; |
95 | unsigned access_permission_3 : 2; |
105 | unsigned access_permission_3 : 2; |
96 | unsigned frame_base_addr : 20; |
106 | unsigned frame_base_addr : 20; |
97 | } __attribute__ ((packed)) pte_level1_t; |
107 | } __attribute__ ((packed)) pte_level1_t; |
98 | 108 | ||
- | 109 | ||
99 | /// Page table level 1 access permission constants |
110 | /* Level 1 page tables access permissions */ |
- | 111 | ||
100 | /// User no acess, kernel no access |
112 | /** User mode: no access, privileged mode: no access */ |
101 | #define pte_ap_user_no_kernel_no 0 |
113 | #define pte_ap_user_no_kernel_no 0 |
102 | /// User no acess, kernel read/write |
114 | /** User mode: no access, privileged mode: read/write */ |
103 | #define pte_ap_user_no_kernel_rw 1 |
115 | #define pte_ap_user_no_kernel_rw 1 |
104 | /// User read only, kernel read/write |
116 | /** User mode: read only, privileged mode: read/write */ |
105 | #define pte_ap_user_ro_kernel_rw 2 |
117 | #define pte_ap_user_ro_kernel_rw 2 |
106 | /// User read/write, kernel read/write |
118 | /// User mode: read/write, privileged mode: read/write |
107 | #define pte_ap_user_rw_kernel_rw 2 |
119 | #define pte_ap_user_rw_kernel_rw 3 |
- | 120 | ||
108 | 121 | ||
109 | /// Value of descriptor_type in pte_level0_t and pte_level1_t that signal not present flag |
122 | /* pte_level0_t and pte_level1_t descriptor_type flags */ |
- | 123 | ||
- | 124 | /** pte_level0_t and pte_level1_t "not present" flag (used in descriptor_type) */ |
|
110 | #define pte_descriptor_not_preset 0 |
125 | #define pte_descriptor_not_preset 0 |
111 | /// Value of descriptor_type in pte_level0_t that signal a coarse page table format |
126 | /** pte_level0_t coarse page table flag (used in descriptor_type) */ |
112 | #define pte_descriptor_coarse_table 1 |
127 | #define pte_descriptor_coarse_table 1 |
113 | /// Value of descriptor_type in pte_level1_t that signal a small page table entry format |
128 | /** pte_level1_t small page table flag (used in descriptor type) */ |
114 | #define pte_descriptor_small_page 2 |
129 | #define pte_descriptor_small_page 2 |
- | 130 | ||
115 | 131 | ||
116 | #endif |
132 | #endif |
117 | 133 | ||
118 | /** @} |
134 | /** @} |
119 | */ |
135 | */ |