| 70,9 → 70,49 |
|---|
| |
| /** Page Table Entry. */ |
| typedef struct { |
| /* placeholder */ |
| /**PageTables are so different that we have different types |
| * for level 0 and level1 page table entries |
| */ |
| unsigned dummy : 32; |
| } pte_t; |
| |
| typedef struct { |
| unsigned destriptor_type : 2; |
| unsigned machine_depend : 3; // Alf: ???? v Architecture previev neni vyznam definovan |
| unsigned domain : 4; |
| unsigned should_be_zero : 1: |
| unsigned coarse_table_addr : 22; |
| } __attribute__ ((packed)) pte_level0_t; |
| |
| //TODO Alf: Comments |
| typedef struct { |
| unsigned destriptor_type : 2; |
| unsigned bufferable : 1; |
| unsigned cacheable : 1; |
| unsigned access_permission_0 : 2; |
| unsigned access_permission_1 : 2; |
| unsigned access_permission_2 : 2; |
| unsigned access_permission_3 : 2; |
| unsigned frame_base_addr : 20; |
| } __attribute__ ((packed)) pte__level1_t; |
| |
| /// Page table level 1 access permission constants |
| /// User no acess, kernel no access |
| #define pte_ap_user_no_kernel_no 0 |
| /// User no acess, kernel read/write |
| #define pte_ap_user_no_kernel_rw 1 |
| /// User read only, kernel read/write |
| #define pte_ap_user_ro_kernel_rw 2 |
| /// User read/write, kernel read/write |
| #define pte_ap_user_rw_kernel_rw 2 |
| |
| /// Value of descriptor_type in pte_level0_t and pte_level1_t that signal not present flag |
| #define pte_descriptor_not_preset 0 |
| /// Value of descriptor_type in pte_level0_t that signal a coarse page table format |
| #define pte_descriptor_coarse_table 1 |
| /// Value of descriptor_type in pte_level1_t that signal a small page table entry format |
| #define pte_descriptor_small_page 2 |
| |
| #endif |
| |
| /** @} |