| 68,68 → 68,15 |
|---|
| typedef int32_t inr_t; |
| typedef int32_t devno_t; |
| |
| |
| /** Page table entry. |
| * |
| * |
| * We have different structs for level 0 and level 1 page table entries. |
| * Note: See page.h for pte_level*_t types of different levels of page table. |
| * */ |
| typedef struct { |
| unsigned dummy : 32; |
| unsigned dummy : 32; |
| } pte_t; |
| |
| /** Level 0 page table entry. */ |
| typedef struct { |
| /* 01b for coarse tables, see below for details */ |
| unsigned descriptor_type : 2; |
| unsigned impl_specific : 3; |
| unsigned domain : 4; |
| unsigned should_be_zero : 1; |
| /* Pointer to the coarse 2nd level page table (holding entries for small (4KB) |
| * or large (64KB) pages. ARM also supports fine 2nd level page tables that |
| * may hold even tiny pages (1KB) but they are bigger (4KB per table in comparison |
| * with 1KB per the coarse table) |
| */ |
| unsigned coarse_table_addr : 22; |
| } __attribute__ ((packed)) pte_level0_t; |
| |
| /** Level 1 page table entry (small (4KB) pages used) */ |
| typedef struct { |
| /* 0b10 for small pages */ |
| unsigned descriptor_type : 2; |
| unsigned bufferable : 1; |
| unsigned cacheable : 1; |
| /* access permissions for each of 4 subparts of a page |
| * (for each 1KB when small pages used */ |
| 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; |
| |
| |
| /* Level 1 page tables access permissions */ |
| |
| /** User mode: no access, privileged mode: no access */ |
| #define PTE_AP_USER_NO_KERNEL_NO 0 |
| /** User mode: no access, privileged mode: read/write */ |
| #define PTE_AP_USER_NO_KERNEL_RW 1 |
| /** User mode: read only, privileged mode: read/write */ |
| #define PTE_AP_USER_RO_KERNEL_RW 2 |
| /// User mode: read/write, privileged mode: read/write |
| #define PTE_AP_USER_RW_KERNEL_RW 3 |
| |
| |
| /* pte_level0_t and pte_level1_t descriptor_type flags */ |
| |
| /** pte_level0_t and pte_level1_t "not present" flag (used in descriptor_type) */ |
| #define PTE_DESCRIPTOR_NOT_PRESENT 0 |
| /** pte_level0_t coarse page table flag (used in descriptor_type) */ |
| #define PTE_DESCRIPTOR_COARSE_TABLE 1 |
| /** pte_level1_t small page table flag (used in descriptor type) */ |
| #define PTE_DESCRIPTOR_SMALL_PAGE 2 |
| |
| |
| #endif |
| |
| /** @} |