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  1. /*
  2.  * Copyright (c) 2003-2004 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 arm32mm
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35.  
  36. #ifndef __MM_H__
  37. #define __MM_H__
  38.  
  39. #include "types.h"
  40.  
  41.  
  42. #define FRAME_WIDTH                 12                  /* 4KB frames */
  43. #define FRAME_SIZE                  (1 << FRAME_WIDTH)
  44.  
  45. #define PAGE_WIDTH                  FRAME_WIDTH
  46. #define PAGE_SIZE                   FRAME_SIZE
  47.  
  48. #ifndef __ASM__
  49. #   define KA2PA(x)                 (((uintptr_t) (x)) - 0x80000000)
  50. #   define PA2KA(x)                 (((uintptr_t) (x)) + 0x80000000)
  51. #else
  52. #   define KA2PA(x)                 ((x) - 0x80000000)
  53. #   define PA2KA(x)                 ((x) + 0x80000000)
  54. #endif
  55.  
  56. #define PTL0_ENTRIES_ARCH               (2<<12)             /* 4096 */
  57. #define SET_PTL0_ADDRESS_ARCH(ptl0)             ( set_ptl0_addr((pte_level0_section *)(ptl0)) )
  58.  
  59. /** Frames per 1MB section */
  60. #define FRAMES_PER_SECTION              ( ( 1 << 20 ) / FRAME_SIZE )
  61.  
  62. /** Converts adress to frame */
  63. #define ADDR2PFN( addr )                ( ((uintptr_t)(addr))>>FRAME_WIDTH )
  64.  
  65. /** Value of descriptor_type in page table entry that signals
  66.  * that this entry describe section
  67.  */  
  68. #define PTE_DESCRIPTOR_SECTION              2
  69.  
  70. /**  Rights: user-no acess, kernel-read/write */
  71. #define PTE_AP_USER_NO_KERNEL_RW            1
  72.  
  73.  
  74. /** Page table level 0 entry - section format */
  75. typedef struct {
  76.     unsigned descriptor_type     : 2; // should be 2
  77.     unsigned bufferable          : 1;
  78.     unsigned cacheable           : 1;
  79.     unsigned machine_depend      : 1;
  80.     unsigned domain              : 4;
  81.     unsigned should_be_zero_1    : 1;
  82.     unsigned access_permission   : 2;  
  83.     unsigned should_be_zero_2    : 8;
  84.     unsigned section_base_addr   : 12;
  85. } __attribute__ ((packed)) pte_level0_section;
  86.  
  87.  
  88. /** Set adress of paging level 0 table
  89.  * \param pt pointer to page table to set
  90.  */  
  91. static inline void set_ptl0_addr( pte_level0_section* pt) {
  92.     asm volatile ( "mcr p15, 0, %0, c2, c0, 0 \n"
  93.     :
  94.     : "r"(pt)
  95.     );
  96.    
  97. }
  98.  
  99. /** Page table that holds 1:1 mapping for kernel starting */
  100. extern pte_level0_section page_table[PTL0_ENTRIES_ARCH];
  101.  
  102. /** Sets memory mapping for kernel */
  103. void mm_kernel_mapping(void);
  104.  
  105. #endif
  106.  
  107. /** @}
  108.  */
  109.  
  110.