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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 SET_PTL0_ADDRESS_ARCH(ptl0)         ( set_ptl0_addr((pte_level0_section *)(ptl0)) )
  57.  
  58.  
  59. /// User no acess, kernel read/write
  60. #define pte_ap_user_no_kernel_rw    1
  61.  
  62. /// Frames per 1MB section
  63. #define FRAMES_PER_SECTION          ( ( 1 << 20 ) / FRAME_SIZE )
  64.  
  65. /// Converts Address to frame
  66. #define ADDR2PFN( addr )            ( ((uintptr_t)(addr))>>FRAME_WIDTH )
  67. /** Value of descriptor_type in page table entry that signals
  68.  * that this entry describe section
  69.  */  
  70. #define pte_descriptor_section 2
  71.  
  72. /** Page Table Entry. */
  73. typedef struct {
  74.     /**PageTables are so different that we have different types
  75.      *   for level 0 and level1 page table entries
  76.      */  
  77.   unsigned dummy : 32;
  78. } pte_t;
  79.  
  80. /** Page table level 0 entry - section format */
  81. typedef struct {
  82.     unsigned descriptor_type     : 2; // should be 2
  83.     unsigned bufferable          : 1;
  84.     unsigned cacheable           : 1;
  85.     unsigned machine_depend      : 1; // Alf: ???? v Architecture previev neni vyznam definovan
  86.     unsigned domain              : 4;
  87.     unsigned should_be_zero_1    : 1;
  88.     unsigned access_permission   : 2;  
  89.     unsigned should_be_zero_2    : 8;
  90.     unsigned section_base_addr   : 12;
  91. } __attribute__ ((packed)) pte_level0_section;
  92.  
  93.  
  94. /** Set adress of paging level 0 table
  95.  * \param pt pointer to page table to set
  96.  */  
  97. static inline void set_ptl0_addr( pte_level0_section* pt) {
  98.     asm volatile ( "mcr p15, 0, %0, c2, c0, 0 \n"
  99.     :
  100.     : "r"(pt)
  101.     );
  102.    
  103. }
  104.  
  105. /// Page table that holds 1:1 mapping for kernel starting
  106. extern pte_level0_section page_table[4096];
  107.  
  108.  
  109. /** Set page table entry to point no frame, be read/write by kernel,
  110.  *   no access by user, become to domain 0, no cache or buffer
  111.  *   \param pte page table entry to set
  112.  *   \param frame frame number of first frame 1MB section
  113.  *   Note: If frame not aligned it's used first lower  1MB aligned frame
  114.  */  
  115. void init_pte_level0_section_entry( pte_level0_section* pte, unsigned frame);
  116.  
  117. /// Sets memory mapping for kernel
  118. void mm_kernel_mapping(void);
  119.  
  120. #endif
  121.  
  122. /** @}
  123.  */
  124.  
  125.