Subversion Repositories HelenOS

Rev

Rev 2131 | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed

  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 <arch/asm.h>
  50. #include <memstr.h>
  51. #include <debug.h>
  52. #include <arch.h>
  53.  
  54. /** Virtual operations for page subsystem. */
  55. page_mapping_operations_t *page_mapping_operations = NULL;
  56.  
  57. void page_init(void)
  58. {
  59.     page_arch_init();
  60. }
  61.  
  62. /** Map memory structure
  63.  *
  64.  * Identity-map memory structure
  65.  * considering possible crossings
  66.  * of page boundaries.
  67.  *
  68.  * @param s Address of the structure.
  69.  * @param size Size of the structure.
  70.  */
  71. void map_structure(uintptr_t s, size_t size)
  72. {
  73.     int i, cnt, length;
  74.  
  75.     length = size + (s - (s & ~(PAGE_SIZE - 1)));
  76.     cnt = length / PAGE_SIZE + (length % PAGE_SIZE > 0);
  77.  
  78.     for (i = 0; i < cnt; i++)
  79.         page_mapping_insert(AS_KERNEL, s + i * PAGE_SIZE, s + i * PAGE_SIZE, PAGE_NOT_CACHEABLE | PAGE_WRITE);
  80.  
  81. }
  82.  
  83. /** Insert mapping of page to frame.
  84.  *
  85.  * Map virtual address page to physical address frame
  86.  * using flags. Allocate and setup any missing page tables.
  87.  *
  88.  * The page table must be locked and interrupts must be disabled.
  89.  *
  90.  * @param as Address space to wich page belongs.
  91.  * @param page Virtual address of the page to be mapped.
  92.  * @param frame Physical address of memory frame to which the mapping is done.
  93.  * @param flags Flags to be used for mapping.
  94.  */
  95. void page_mapping_insert(as_t *as, uintptr_t page, uintptr_t frame, int flags)
  96. {
  97.     ASSERT(page_mapping_operations);
  98.     ASSERT(page_mapping_operations->mapping_insert);
  99.    
  100.     page_mapping_operations->mapping_insert(as, page, frame, flags);
  101. }
  102.  
  103. /** Remove mapping of page.
  104.  *
  105.  * Remove any mapping of page within address space as.
  106.  * TLB shootdown should follow in order to make effects of
  107.  * this call visible.
  108.  *
  109.  * The page table must be locked and interrupts must be disabled.
  110.  *
  111.  * @param as Address space to wich page belongs.
  112.  * @param page Virtual address of the page to be demapped.
  113.  */
  114. void page_mapping_remove(as_t *as, uintptr_t page)
  115. {
  116.     ASSERT(page_mapping_operations);
  117.     ASSERT(page_mapping_operations->mapping_remove);
  118.    
  119.     page_mapping_operations->mapping_remove(as, page);
  120. }
  121.  
  122. /** Find mapping for virtual page
  123.  *
  124.  * Find mapping for virtual page.
  125.  *
  126.  * The page table must be locked and interrupts must be disabled.
  127.  *
  128.  * @param as Address space to wich page belongs.
  129.  * @param page Virtual page.
  130.  *
  131.  * @return NULL if there is no such mapping; requested mapping otherwise.
  132.  */
  133. pte_t *page_mapping_find(as_t *as, uintptr_t page)
  134. {
  135.     ASSERT(page_mapping_operations);
  136.     ASSERT(page_mapping_operations->mapping_find);
  137.  
  138.     return page_mapping_operations->mapping_find(as, page);
  139. }
  140.  
  141. /** @}
  142.  */
  143.