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  1. /*
  2.  * Copyright (c) 2007 Pavel Jancik, Michal Kebrt
  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 arm32  
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_arm32_TYPES_H_
  36. #define KERN_arm32_TYPES_H_
  37.  
  38. #define NULL 0
  39. #define false 0
  40. #define true 1
  41.  
  42. typedef signed char int8_t;
  43. typedef signed short int16_t;
  44. typedef signed long int32_t;
  45. typedef signed long long int64_t;
  46.  
  47. typedef unsigned char uint8_t;
  48. typedef unsigned short uint16_t;
  49. typedef unsigned long uint32_t;
  50. typedef unsigned long long uint64_t;
  51.  
  52. typedef uint32_t size_t;
  53. typedef uint32_t count_t;
  54. typedef uint32_t index_t;
  55.  
  56. typedef uint32_t uintptr_t;
  57. typedef uint32_t pfn_t;
  58.  
  59. typedef uint32_t ipl_t;
  60.  
  61. typedef uint32_t unative_t;
  62. typedef int32_t native_t;
  63.  
  64. typedef uint8_t bool;
  65. typedef uint64_t task_id_t;
  66. typedef uint32_t context_id_t;
  67.  
  68. typedef int32_t inr_t;
  69. typedef int32_t devno_t;
  70.  
  71.  
  72. /** Page table entry.
  73.  *  
  74.  *  We have different structs for level 0 and level 1 page table entries.
  75.  * */
  76. typedef struct {
  77.   unsigned dummy : 32;
  78. } pte_t;
  79.  
  80. /** Level 0 page table entry. */
  81. typedef struct {
  82.     /* 01b for coarse tables, see below for details */
  83.     unsigned descriptor_type     : 2;
  84.     unsigned impl_specific       : 3;
  85.     unsigned domain              : 4;
  86.     unsigned should_be_zero      : 1;
  87.     /* Pointer to the coarse 2nd level page table (holding entries for small (4KB)
  88.      * or large (64KB) pages. ARM also supports fine 2nd level page tables that
  89.      * may hold even tiny pages (1KB) but they are bigger (4KB per table in comparison
  90.      * with 1KB per the coarse table)
  91.     */
  92.     unsigned coarse_table_addr   : 22;
  93. } __attribute__ ((packed)) pte_level0_t;
  94.  
  95. /** Level 1 page table entry (small (4KB) pages used) */
  96. typedef struct {
  97.     /* 0b10 for small pages */
  98.     unsigned descriptor_type     : 2;
  99.     unsigned bufferable          : 1;
  100.     unsigned cacheable           : 1;
  101.     /* access permissions for each of 4 subparts of a page
  102.      * (for each 1KB when small pages used */
  103.     unsigned access_permission_0 : 2;
  104.     unsigned access_permission_1 : 2;
  105.     unsigned access_permission_2 : 2;
  106.     unsigned access_permission_3 : 2;
  107.     unsigned frame_base_addr     : 20;
  108. } __attribute__ ((packed)) pte_level1_t;
  109.  
  110.  
  111. /* Level 1 page tables access permissions */
  112.  
  113. /** User mode: no access, privileged mode: no access */
  114. #define PTE_AP_USER_NO_KERNEL_NO 0
  115. /** User mode: no access, privileged mode: read/write */
  116. #define PTE_AP_USER_NO_KERNEL_RW 1
  117. /** User mode: read only, privileged mode: read/write */
  118. #define PTE_AP_USER_RO_KERNEL_RW 2
  119. /// User mode: read/write, privileged mode: read/write
  120. #define PTE_AP_USER_RW_KERNEL_RW 3
  121.  
  122.  
  123. /* pte_level0_t and pte_level1_t descriptor_type flags */
  124.  
  125. /** pte_level0_t and pte_level1_t "not present" flag (used in descriptor_type) */
  126. #define PTE_DESCRIPTOR_NOT_PRESENT  0
  127. /** pte_level0_t coarse page table flag (used in descriptor_type) */
  128. #define PTE_DESCRIPTOR_COARSE_TABLE 1
  129. /** pte_level1_t small page table flag (used in descriptor type) */
  130. #define PTE_DESCRIPTOR_SMALL_PAGE   2
  131.  
  132.  
  133. #endif
  134.  
  135. /** @}
  136.  */
  137.