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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. /*
  30.  * Virtual Address Translation subsystem.
  31.  */
  32.  
  33. #include <mm/page.h>
  34. #include <arch/mm/page.h>
  35. #include <arch/mm/asid.h>
  36. #include <mm/as.h>
  37. #include <mm/frame.h>
  38. #include <arch/types.h>
  39. #include <typedefs.h>
  40. #include <arch/asm.h>
  41. #include <memstr.h>
  42. #include <debug.h>
  43. #include <arch.h>
  44.  
  45. /** Virtual operations for page subsystem. */
  46. page_operations_t *page_operations = NULL;
  47.  
  48. void page_init(void)
  49. {
  50.     page_arch_init();
  51.     page_mapping_insert(AS_KERNEL, 0x0, 0x0, PAGE_NOT_PRESENT, 0);
  52. }
  53.  
  54. /** Map memory structure
  55.  *
  56.  * Identity-map memory structure
  57.  * considering possible crossings
  58.  * of page boundaries.
  59.  *
  60.  * @param s Address of the structure.
  61.  * @param size Size of the structure.
  62.  */
  63. void map_structure(__address s, size_t size)
  64. {
  65.     int i, cnt, length;
  66.  
  67.     length = size + (s - (s & ~(PAGE_SIZE-1)));
  68.     cnt = length/PAGE_SIZE + (length%PAGE_SIZE>0);
  69.  
  70.     for (i = 0; i < cnt; i++)
  71.         page_mapping_insert(AS_KERNEL, s + i*PAGE_SIZE, s + i*PAGE_SIZE, PAGE_NOT_CACHEABLE, 0);
  72.  
  73. }
  74.  
  75. /** Map page to frame
  76.  *
  77.  * Map virtual address 'page' to physical address 'frame'
  78.  * using 'flags'. Allocate and setup any missing page tables.
  79.  *
  80.  * @param as Address space to wich page belongs. Must be locked prior the call.
  81.  * @param page Virtual address of the page to be mapped.
  82.  * @param frame Physical address of memory frame to which the mapping is done.
  83.  * @param flags Flags to be used for mapping.
  84.  * @param root Explicit PTL0 address.
  85.  */
  86. void page_mapping_insert(as_t *as, __address page, __address frame, int flags, __address root)
  87. {
  88.     ASSERT(page_operations);
  89.     ASSERT(page_operations->mapping_insert);
  90.    
  91.     page_operations->mapping_insert(as, page, frame, flags, root);
  92. }
  93.  
  94. /** Find mapping for virtual page
  95.  *
  96.  * Find mapping for virtual page.
  97.  *
  98.  * @param as Address space to wich page belongs must be locked prior the call.
  99.  * @param page Virtual page.
  100.  * @param root PTL0 address if non-zero.
  101.  *
  102.  * @return NULL if there is no such mapping; requested mapping otherwise.
  103.  */
  104. pte_t *page_mapping_find(as_t *as, __address page, __address root)
  105. {
  106.     ASSERT(page_operations);
  107.     ASSERT(page_operations->mapping_find);
  108.  
  109.     return page_operations->mapping_find(as, page, root);
  110. }
  111.