| 1,5 → 1,5 |
|---|
| /* |
| * Copyright (c) 2003-2007 Jakub Jermar |
| * Copyright (c) 2007 Pavel Jancik, Michal Kebrt |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| 68,27 → 68,37 |
|---|
| typedef int32_t inr_t; |
| typedef int32_t devno_t; |
| |
| /** Page Table Entry. */ |
| /** Page table entry. |
| * |
| * We have different structs for level 0 and level 1 page table entries. |
| * */ |
| typedef struct { |
| /**PageTables are so different that we have different types |
| * for level 0 and level1 page table entries |
| */ |
| 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 machine_depend : 3; // Alf: ???? v Architecture previev neni vyznam definovan |
| 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; |
| |
| //TODO Alf: Comments |
| /** 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; |
| 96,23 → 106,29 |
|---|
| unsigned frame_base_addr : 20; |
| } __attribute__ ((packed)) pte_level1_t; |
| |
| /// Page table level 1 access permission constants |
| /// User no acess, kernel no access |
| |
| /* Level 1 page tables access permissions */ |
| |
| /** User mode: no access, privileged mode: no access */ |
| #define pte_ap_user_no_kernel_no 0 |
| /// User no acess, kernel read/write |
| /** User mode: no access, privileged mode: read/write */ |
| #define pte_ap_user_no_kernel_rw 1 |
| /// User read only, kernel read/write |
| /** User mode: read only, privileged mode: read/write */ |
| #define pte_ap_user_ro_kernel_rw 2 |
| /// User read/write, kernel read/write |
| #define pte_ap_user_rw_kernel_rw 2 |
| /// User mode: read/write, privileged mode: read/write |
| #define pte_ap_user_rw_kernel_rw 3 |
| |
| /// 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 |
| |
| /* 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_preset 0 |
| /** pte_level0_t coarse page table flag (used in descriptor_type) */ |
| #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 |
| /** pte_level1_t small page table flag (used in descriptor type) */ |
| #define pte_descriptor_small_page 2 |
| |
| |
| #endif |
| |
| /** @} |