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684 jermar 1 
/*
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 * Copyright (C) 2006 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <genarch/mm/page_pt.h>
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#include <mm/page.h>
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#include <mm/frame.h>
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#include <mm/as.h>
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#include <arch/mm/page.h>
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#include <arch/mm/as.h>
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#include <arch/types.h>
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#include <typedefs.h>
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#include <arch/asm.h>
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#include <memstr.h>
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static void pt_mapping_insert(as_t *as, __address page, __address frame, int flags);
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static pte_t *pt_mapping_find(as_t *as, __address page);
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page_operations_t page_pt_operations = {
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    .mapping_insert = pt_mapping_insert,
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    .mapping_find = pt_mapping_find
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};
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/** Map page to frame using hierarchical page tables.
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 *
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 * Map virtual address 'page' to physical address 'frame'
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 * using 'flags'.
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 *
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 * The address space must be locked and interrupts must be disabled.
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 *
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 * @param as Address space to wich page belongs.
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 * @param page Virtual address of the page to be mapped.
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 * @param frame Physical address of memory frame to which the mapping is done.
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 * @param flags Flags to be used for mapping.
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 */
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void pt_mapping_insert(as_t *as, __address page, __address frame, int flags)
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{
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    pte_t *ptl0, *ptl1, *ptl2, *ptl3;
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    __address newpt;
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    ptl0 = (pte_t *) PA2KA((__address) as->page_table);
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    if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT) {
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        newpt = frame_alloc(ONE_FRAME, FRAME_KA);
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        memsetb(newpt, PAGE_SIZE, 0);
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        SET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page), KA2PA(newpt));
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        SET_PTL1_FLAGS(ptl0, PTL0_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
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    }
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    ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page)));
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    if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT) {
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        newpt = frame_alloc(ONE_FRAME, FRAME_KA);
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        memsetb(newpt, PAGE_SIZE, 0);
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        SET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page), KA2PA(newpt));
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        SET_PTL2_FLAGS(ptl1, PTL1_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
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    }
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    ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page)));
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    if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT) {
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        newpt = frame_alloc(ONE_FRAME, FRAME_KA);
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        memsetb(newpt, PAGE_SIZE, 0);
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        SET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page), KA2PA(newpt));
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        SET_PTL3_FLAGS(ptl2, PTL2_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
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    }
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    ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page)));
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    SET_FRAME_ADDRESS(ptl3, PTL3_INDEX(page), frame);
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    SET_FRAME_FLAGS(ptl3, PTL3_INDEX(page), flags);
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}
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/** Find mapping for virtual page in hierarchical page tables.
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 *
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 * Find mapping for virtual page.
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 *
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 * The address space must be locked and interrupts must be disabled.
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 *
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 * @param as Address space to which page belongs.
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 * @param page Virtual page.
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 *
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 * @return NULL if there is no such mapping; entry from PTL3 describing the mapping otherwise.
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 */
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pte_t *pt_mapping_find(as_t *as, __address page)
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{
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    pte_t *ptl0, *ptl1, *ptl2, *ptl3;
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    ptl0 = (pte_t *) PA2KA((__address) as->page_table);
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    if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT)
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        return NULL;
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    ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page)));
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    if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT)
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        return NULL;
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    ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page)));
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    if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT)
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        return NULL;
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    ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page)));
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    return &ptl3[PTL3_INDEX(page)];
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}