| 0,0 → 1,125 |
|---|
| /* |
| * Copyright (C) 2006 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <genarch/mm/page_pt.h> |
| #include <mm/page.h> |
| #include <mm/frame.h> |
| #include <arch/mm/page.h> |
| #include <arch/types.h> |
| #include <typedefs.h> |
| #include <arch/asm.h> |
| #include <memstr.h> |
| |
| static void pt_mapping_insert(__address page, __address frame, int flags, __address root); |
| static pte_t *pt_mapping_find(__address page, __address root); |
| |
| page_operations_t page_pt_operations = { |
| .mapping_insert = pt_mapping_insert, |
| .mapping_find = pt_mapping_find |
| }; |
| |
| /** Map page to frame using hierarchical page tables. |
| * |
| * Map virtual address 'page' to physical address 'frame' |
| * using 'flags'. |
| * |
| * @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 pt_mapping_insert(__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, ONE_FRAME); |
| 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 | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE); |
| } |
| |
| 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, ONE_FRAME); |
| 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 | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE); |
| } |
| |
| 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, ONE_FRAME); |
| 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 | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE); |
| } |
| |
| 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); |
| } |
| |
| /** Find mapping for virtual page in hierarchical page tables. |
| * |
| * Find mapping for virtual page. |
| * |
| * @param page Virtual page. |
| * @param root PTL0 address if non-zero. |
| * |
| * @return NULL if there is no such mapping; entry from PTL3 describing the mapping otherwise. |
| */ |
| pte_t *pt_mapping_find(__address page, __address root) |
| { |
| pte_t *ptl0, *ptl1, *ptl2, *ptl3; |
| |
| ptl0 = (pte_t *) PA2KA(root ? root : (__address) GET_PTL0_ADDRESS()); |
| |
| if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT) |
| return NULL; |
| |
| ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page))); |
| |
| if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT) |
| return NULL; |
| |
| ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page))); |
| |
| if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT) |
| return NULL; |
| |
| ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page))); |
| |
| return &ptl3[PTL3_INDEX(page)]; |
| } |