| 27,9 → 27,11 |
|---|
| */ |
| |
| #include <mm/page.h> |
| #include <mm/frame.h> |
| #include <arch/mm/page.h> |
| #include <arch/types.h> |
| #include <typedefs.h> |
| #include <arch/asm.h> |
| |
| void page_init(void) |
| { |
| 58,3 → 60,51 |
|---|
| map_page_to_frame(s + i*PAGE_SIZE, s + i*PAGE_SIZE, PAGE_NOT_CACHEABLE, 0); |
| |
| } |
| |
| /** Map page to frame |
| * |
| * Map virtual address 'page' to physical address 'frame' |
| * using 'flags'. Allocate and setup any missing page tables. |
| * |
| * @param page Virtual address of the page to be mapped. |
| * @param frame Physical address of memory frame to which the mapping is done. |
| * @param flags Flags to be used for mapping. |
| * @param root Explicit PTL0 address. |
| */ |
| void map_page_to_frame(__address page, __address frame, int flags, __address root) |
| { |
| pte_t *ptl0, *ptl1, *ptl2, *ptl3; |
| __address newpt; |
| |
| ptl0 = (pte_t *) PA2KA(root ? root : (__address) GET_PTL0_ADDRESS()); |
| |
| if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT) { |
| newpt = frame_alloc(FRAME_KA); |
| memsetb(newpt, PAGE_SIZE, 0); |
| SET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page), KA2PA(newpt)); |
| SET_PTL1_FLAGS(ptl0, PTL0_INDEX(page), PAGE_PRESENT | PAGE_USER); |
| } |
| |
| ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page))); |
| |
| if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT) { |
| newpt = frame_alloc(FRAME_KA); |
| memsetb(newpt, PAGE_SIZE, 0); |
| SET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page), KA2PA(newpt)); |
| SET_PTL2_FLAGS(ptl1, PTL1_INDEX(page), PAGE_PRESENT | PAGE_USER); |
| } |
| |
| ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page))); |
| |
| if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT) { |
| newpt = frame_alloc(FRAME_KA); |
| memsetb(newpt, PAGE_SIZE, 0); |
| SET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page), KA2PA(newpt)); |
| SET_PTL3_FLAGS(ptl2, PTL2_INDEX(page), PAGE_PRESENT | PAGE_USER); |
| } |
| |
| ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page))); |
| |
| SET_FRAME_ADDRESS(ptl3, PTL3_INDEX(page), frame); |
| SET_FRAME_FLAGS(ptl3, PTL3_INDEX(page), flags); |
| } |