| 107,11 → 107,13 |
|---|
| |
| /** 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 |
| 123,10 → 125,12 |
|---|
| |
| /** 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; |
| 141,10 → 145,13 |
|---|
| |
| /** 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 |
| |
| 153,8 → 160,10 |
|---|
| |
| /** 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 |
| |