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  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/barrier.h>
  49. #include <arch/types.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,
  81.             s + i * PAGE_SIZE, PAGE_NOT_CACHEABLE | PAGE_WRITE);
  82.  
  83.     /* Repel prefetched accesses to the old mapping. */
  84.     memory_barrier();
  85. }
  86.  
  87. /** Insert mapping of page to frame.
  88.  *
  89.  * Map virtual address page to physical address frame
  90.  * using flags. Allocate and setup any missing page tables.
  91.  *
  92.  * The page table must be locked and interrupts must be disabled.
  93.  *
  94.  * @param as        Address space to wich page belongs.
  95.  * @param page      Virtual address of the page to be mapped.
  96.  * @param frame     Physical address of memory frame to which the mapping is
  97.  *          done.
  98.  * @param flags     Flags to be used for mapping.
  99.  */
  100. void page_mapping_insert(as_t *as, uintptr_t page, uintptr_t frame, int flags)
  101. {
  102.     ASSERT(page_mapping_operations);
  103.     ASSERT(page_mapping_operations->mapping_insert);
  104.    
  105.     page_mapping_operations->mapping_insert(as, page, frame, flags);
  106.    
  107.     /* Repel prefetched accesses to the old mapping. */
  108.     memory_barrier();
  109. }
  110.  
  111. /** Remove mapping of page.
  112.  *
  113.  * Remove any mapping of page within address space as.
  114.  * TLB shootdown should follow in order to make effects of
  115.  * this call visible.
  116.  *
  117.  * The page table must be locked and interrupts must be disabled.
  118.  *
  119.  * @param as        Address space to wich page belongs.
  120.  * @param page      Virtual address of the page to be demapped.
  121.  */
  122. void page_mapping_remove(as_t *as, uintptr_t page)
  123. {
  124.     ASSERT(page_mapping_operations);
  125.     ASSERT(page_mapping_operations->mapping_remove);
  126.    
  127.     page_mapping_operations->mapping_remove(as, page);
  128.  
  129.     /* Repel prefetched accesses to the old mapping. */
  130.     memory_barrier();
  131. }
  132.  
  133. /** Find mapping for virtual page
  134.  *
  135.  * Find mapping for virtual page.
  136.  *
  137.  * The page table must be locked and interrupts must be disabled.
  138.  *
  139.  * @param as        Address space to wich page belongs.
  140.  * @param page      Virtual page.
  141.  *
  142.  * @return      NULL if there is no such mapping; requested mapping
  143.  *          otherwise.
  144.  */
  145. pte_t *page_mapping_find(as_t *as, uintptr_t page)
  146. {
  147.     ASSERT(page_mapping_operations);
  148.     ASSERT(page_mapping_operations->mapping_find);
  149.  
  150.     return page_mapping_operations->mapping_find(as, page);
  151. }
  152.  
  153. /** @}
  154.  */
  155.