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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 arm32boot
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35.  
  36. #ifndef __MM_H__
  37. #define __MM_H__
  38.  
  39. #ifndef __ASM__
  40. #include "types.h"
  41. #endif
  42.  
  43.  
  44. #define FRAME_WIDTH                 12                  /* 4KB frames */
  45. #define FRAME_SIZE                  (1 << FRAME_WIDTH)
  46.  
  47. #define PAGE_WIDTH                  FRAME_WIDTH
  48. #define PAGE_SIZE                   FRAME_SIZE
  49.  
  50. #ifndef __ASM__
  51. #   define KA2PA(x)                 (((uintptr_t) (x)) - 0x80000000)
  52. #   define PA2KA(x)                 (((uintptr_t) (x)) + 0x80000000)
  53. #else
  54. #   define KA2PA(x)                 ((x) - 0x80000000)
  55. #   define PA2KA(x)                 ((x) + 0x80000000)
  56. #endif
  57.  
  58. /** Number of entries in PTL0 */
  59. #define PTL0_ENTRIES_ARCH               (1<<12)             /* 4096 */
  60.  
  61. /** Frames per 1MB section */
  62. #define FRAMES_PER_SECTION              ( ( 1 << 20 ) / FRAME_SIZE )
  63.  
  64. /** Converts adress to frame number */
  65. #define ADDR2PFN( addr )                ( ((uintptr_t)(addr))>>FRAME_WIDTH )
  66.  
  67. /** Descriptor type that signs "section" page table entry
  68.  * (one-level paging with 1MB sized pages)  */  
  69. #define PTE_DESCRIPTOR_SECTION              2
  70.  
  71. /** Access rights to page table: user-no access, kernel-read/write */
  72. #define PTE_AP_USER_NO_KERNEL_RW            1
  73.  
  74. #ifndef __ASM__
  75.  
  76. /** Page table level 0 entry - "section" format (one-level paging, 1MB sized
  77.  * pages). Used only for booting the kernel. */
  78. typedef struct {
  79.     unsigned descriptor_type     : 2; // PTE_DESCRIPTOR_SECTION (0b10)
  80.     unsigned bufferable          : 1;
  81.     unsigned cacheable           : 1;
  82.     unsigned impl_specific       : 1;
  83.     unsigned domain              : 4;
  84.     unsigned should_be_zero_1    : 1;
  85.     unsigned access_permission   : 2;  
  86.     unsigned should_be_zero_2    : 8;
  87.     unsigned section_base_addr   : 12;
  88. } __attribute__ ((packed)) pte_level0_section;
  89.  
  90.  
  91. /** Sets the address of level 0 page table.
  92.  * \param pt pointer to the page table to set
  93.  */  
  94. static inline void set_ptl0_address( pte_level0_section* pt) {
  95.     asm volatile ( "mcr p15, 0, %0, c2, c0, 0 \n"
  96.     :
  97.     : "r"(pt)
  98.     );
  99.    
  100. }
  101.  
  102. /** Page table that holds 1:1 mapping for booting the kernel. */
  103. extern pte_level0_section page_table[PTL0_ENTRIES_ARCH];
  104.  
  105. /** Sets memory mapping for kernel */
  106. void mm_kernel_mapping(void);
  107.  
  108. #endif
  109.  
  110. #endif
  111.  
  112. /** @}
  113.  */
  114.  
  115.