| 0,0 → 1,143 |
|---|
| /* |
| * Copyright (C) 2001-2006 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. |
| */ |
| |
| /** @addtogroup genericmm |
| * @{ |
| */ |
| |
| /** |
| * @file |
| * @brief Virtual Address Translation subsystem. |
| * |
| * This file contains code for creating, destroying and searching |
| * mappings between virtual addresses and physical addresses. |
| * Functions here are mere wrappers that call the real implementation. |
| * They however, define the single interface. |
| */ |
| |
| #include <mm/page.h> |
| #include <arch/mm/page.h> |
| #include <arch/mm/asid.h> |
| #include <mm/as.h> |
| #include <mm/frame.h> |
| #include <arch/types.h> |
| #include <typedefs.h> |
| #include <arch/asm.h> |
| #include <memstr.h> |
| #include <debug.h> |
| #include <arch.h> |
| |
| /** Virtual operations for page subsystem. */ |
| page_mapping_operations_t *page_mapping_operations = NULL; |
| |
| void page_init(void) |
| { |
| page_arch_init(); |
| } |
| |
| /** Map memory structure |
| * |
| * Identity-map memory structure |
| * considering possible crossings |
| * of page boundaries. |
| * |
| * @param s Address of the structure. |
| * @param size Size of the structure. |
| */ |
| void map_structure(uintptr_t s, size_t size) |
| { |
| int i, cnt, length; |
| |
| length = size + (s - (s & ~(PAGE_SIZE - 1))); |
| cnt = length / PAGE_SIZE + (length % PAGE_SIZE > 0); |
| |
| for (i = 0; i < cnt; i++) |
| page_mapping_insert(AS_KERNEL, s + i * PAGE_SIZE, s + i * PAGE_SIZE, PAGE_NOT_CACHEABLE); |
| |
| } |
| |
| /** Insert mapping of page to frame. |
| * |
| * Map virtual address page to physical address frame |
| * using flags. Allocate and setup any missing page tables. |
| * |
| * The page table 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 mapped. |
| * @param frame Physical address of memory frame to which the mapping is done. |
| * @param flags Flags to be used for mapping. |
| */ |
| void page_mapping_insert(as_t *as, uintptr_t page, uintptr_t frame, int flags) |
| { |
| ASSERT(page_mapping_operations); |
| ASSERT(page_mapping_operations->mapping_insert); |
| |
| page_mapping_operations->mapping_insert(as, page, frame, flags); |
| } |
| |
| /** Remove mapping of page. |
| * |
| * Remove any mapping of page within address space as. |
| * TLB shootdown should follow in order to make effects of |
| * this call visible. |
| * |
| * The page table 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 page_mapping_remove(as_t *as, uintptr_t page) |
| { |
| ASSERT(page_mapping_operations); |
| ASSERT(page_mapping_operations->mapping_remove); |
| |
| page_mapping_operations->mapping_remove(as, page); |
| } |
| |
| /** Find mapping for virtual page |
| * |
| * Find mapping for virtual page. |
| * |
| * The page table must be locked and interrupts must be disabled. |
| * |
| * @param as Address space to wich page belongs. |
| * @param page Virtual page. |
| * |
| * @return NULL if there is no such mapping; requested mapping otherwise. |
| */ |
| pte_t *page_mapping_find(as_t *as, uintptr_t page) |
| { |
| ASSERT(page_mapping_operations); |
| ASSERT(page_mapping_operations->mapping_find); |
| |
| return page_mapping_operations->mapping_find(as, page); |
| } |
| |
| /** @} |
| */ |