| 38,10 → 38,12 |
|---|
| #include <memstr.h> |
| |
| static void pt_mapping_insert(as_t *as, __address page, __address frame, int flags); |
| static void pt_mapping_remove(as_t *as, __address page); |
| static pte_t *pt_mapping_find(as_t *as, __address page); |
| |
| page_mapping_operations_t pt_mapping_operations = { |
| .mapping_insert = pt_mapping_insert, |
| .mapping_remove = pt_mapping_remove, |
| .mapping_find = pt_mapping_find |
| }; |
| |
| 95,6 → 97,42 |
|---|
| SET_FRAME_FLAGS(ptl3, PTL3_INDEX(page), flags); |
| } |
| |
| /** Remove mapping of page from hierarchical page tables. |
| * |
| * Remove any mapping of 'page' within address space 'as'. |
| * TLB shootdown should follow in order to make effects of |
| * this call visible. |
| * |
| * The address space must be locked and interrupts must be disabled. |
| * |
| * @param as Address space to wich page belongs. |
| * @param page Virtual address of the page to be demapped. |
| */ |
| void pt_mapping_remove(as_t *as, __address page) |
| { |
| pte_t *ptl0, *ptl1, *ptl2, *ptl3; |
| |
| ptl0 = (pte_t *) PA2KA((__address) as->page_table); |
| |
| if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT) |
| return; |
| |
| ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page))); |
| |
| if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT) |
| return; |
| |
| ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page))); |
| |
| if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT) |
| return; |
| |
| ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page))); |
| |
| /* Destroy the mapping. Setting to PAGE_NOT_PRESENT is not sufficient. */ |
| memsetb((__address) &ptl3[PTL3_INDEX(page)], sizeof(pte_t), 0); |
| } |
| |
| /** Find mapping for virtual page in hierarchical page tables. |
| * |
| * Find mapping for virtual page. |