kernel/generic/src/mm/page.c

   1 /*
   2  * Copyright (c) 2001-2006 Jakub Jermar
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in the
  13  *   documentation and/or other materials provided with the distribution.
  14  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /** @addtogroup genericmm
  30  * @{
  31  */
  32
  33 /**
  34  * @file
  35  * @brief       Virtual Address Translation subsystem.
  36  *
  37  * This file contains code for creating, destroying and searching
  38  * mappings between virtual addresses and physical addresses.
  39  * Functions here are mere wrappers that call the real implementation.
  40  * They however, define the single interface.
  41  */
  42
  43 #include <mm/page.h>
  44 #include <arch/mm/page.h>
  45 #include <arch/mm/asid.h>
  46 #include <mm/as.h>
  47 #include <mm/frame.h>
  48 #include <arch/types.h>
  49 #include <typedefs.h>
  50 #include <arch/asm.h>
  51 #include <memstr.h>
  52 #include <debug.h>
  53 #include <arch.h>
  54
  55 /** Virtual operations for page subsystem. */
  56 page_mapping_operations_t *page_mapping_operations = NULL;
  57
  58 void page_init(void)
  59 {
  60         page_arch_init();
  61 }
  62
  63 /** Map memory structure
  64  *
  65  * Identity-map memory structure
  66  * considering possible crossings
  67  * of page boundaries.
  68  *
  69  * @param s Address of the structure.
  70  * @param size Size of the structure.
  71  */
  72 void map_structure(uintptr_t s, size_t size)
  73 {
  74         int i, cnt, length;
  75
  76         length = size + (s - (s & ~(PAGE_SIZE - 1)));
  77         cnt = length / PAGE_SIZE + (length % PAGE_SIZE > 0);
  78
  79         for (i = 0; i < cnt; i++)
  80                 page_mapping_insert(AS_KERNEL, s + i * PAGE_SIZE, s + i * PAGE_SIZE, PAGE_NOT_CACHEABLE);
  81
  82 }
  83
  84 /** Insert mapping of page to frame.
  85  *
  86  * Map virtual address page to physical address frame
  87  * using flags. Allocate and setup any missing page tables.
  88  *
  89  * The page table must be locked and interrupts must be disabled.
  90  *
  91  * @param as Address space to wich page belongs.
  92  * @param page Virtual address of the page to be mapped.
  93  * @param frame Physical address of memory frame to which the mapping is done.
  94  * @param flags Flags to be used for mapping.
  95  */
  96 void page_mapping_insert(as_t *as, uintptr_t page, uintptr_t frame, int flags)
  97 {
  98         ASSERT(page_mapping_operations);
  99         ASSERT(page_mapping_operations->mapping_insert);
 100
 101         page_mapping_operations->mapping_insert(as, page, frame, flags);
 102 }
 103
 104 /** Remove mapping of page.
 105  *
 106  * Remove any mapping of page within address space as.
 107  * TLB shootdown should follow in order to make effects of
 108  * this call visible.
 109  *
 110  * The page table must be locked and interrupts must be disabled.
 111  *
 112  * @param as Address space to wich page belongs.
 113  * @param page Virtual address of the page to be demapped.
 114  */
 115 void page_mapping_remove(as_t *as, uintptr_t page)
 116 {
 117         ASSERT(page_mapping_operations);
 118         ASSERT(page_mapping_operations->mapping_remove);
 119
 120         page_mapping_operations->mapping_remove(as, page);
 121 }
 122
 123 /** Find mapping for virtual page
 124  *
 125  * Find mapping for virtual page.
 126  *
 127  * The page table must be locked and interrupts must be disabled.
 128  *
 129  * @param as Address space to wich page belongs.
 130  * @param page Virtual page.
 131  *
 132  * @return NULL if there is no such mapping; requested mapping otherwise.
 133  */
 134 pte_t *page_mapping_find(as_t *as, uintptr_t page)
 135 {
 136         ASSERT(page_mapping_operations);
 137         ASSERT(page_mapping_operations->mapping_find);
 138
 139         return page_mapping_operations->mapping_find(as, page);
 140 }
 141
 142 /** @}
 143  */