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)]; |
} |