0,0 → 1,142 |
/* |
* 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 <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); |
} |
|
/** @} |
*/ |