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2198 | jancik | 1 | /* |
2 | * Copyright (c) 2003-2004 Jakub Jermar |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | /** @addtogroup arm32mm |
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30 | * @{ |
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31 | */ |
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32 | /** @file |
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33 | */ |
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34 | |||
35 | |||
36 | #ifndef __MM_H__ |
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37 | #define __MM_H__ |
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38 | |||
39 | #include "types.h" |
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40 | |||
41 | |||
42 | #define FRAME_WIDTH 12 /* 4KB frames */ |
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43 | #define FRAME_SIZE (1 << FRAME_WIDTH) |
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44 | |||
45 | #define PAGE_WIDTH FRAME_WIDTH |
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46 | #define PAGE_SIZE FRAME_SIZE |
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47 | |||
48 | #ifndef __ASM__ |
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49 | # define KA2PA(x) (((uintptr_t) (x)) - 0x80000000) |
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50 | # define PA2KA(x) (((uintptr_t) (x)) + 0x80000000) |
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51 | #else |
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52 | # define KA2PA(x) ((x) - 0x80000000) |
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53 | # define PA2KA(x) ((x) + 0x80000000) |
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54 | #endif |
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55 | |||
56 | #define SET_PTL0_ADDRESS_ARCH(ptl0) ( set_ptl0_addr((pte_level0_section *)(ptl0)) ) |
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57 | |||
58 | |||
59 | /// User no acess, kernel read/write |
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60 | #define pte_ap_user_no_kernel_rw 1 |
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61 | |||
62 | /// Frames per 1MB section |
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63 | #define FRAMES_PER_SECTION ( ( 1 << 20 ) / FRAME_SIZE ) |
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64 | |||
65 | /// Converts Address to frame |
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66 | #define ADDR2PFN( addr ) ( ((uintptr_t)(addr))>>FRAME_WIDTH ) |
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67 | /** Value of descriptor_type in page table entry that signals |
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68 | * that this entry describe section |
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69 | */ |
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70 | #define pte_descriptor_section 2 |
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71 | |||
72 | /** Page Table Entry. */ |
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73 | typedef struct { |
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74 | /**PageTables are so different that we have different types |
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75 | * for level 0 and level1 page table entries |
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76 | */ |
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77 | unsigned dummy : 32; |
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78 | } pte_t; |
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79 | |||
80 | /** Page table level 0 entry - section format */ |
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81 | typedef struct { |
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82 | unsigned descriptor_type : 2; // should be 2 |
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83 | unsigned bufferable : 1; |
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84 | unsigned cacheable : 1; |
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85 | unsigned machine_depend : 1; // Alf: ???? v Architecture previev neni vyznam definovan |
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86 | unsigned domain : 4; |
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87 | unsigned should_be_zero_1 : 1; |
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88 | unsigned access_permission : 2; |
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89 | unsigned should_be_zero_2 : 8; |
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90 | unsigned section_base_addr : 12; |
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91 | } __attribute__ ((packed)) pte_level0_section; |
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92 | |||
93 | |||
94 | /** Set adress of paging level 0 table |
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95 | * \param pt pointer to page table to set |
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96 | */ |
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97 | static inline void set_ptl0_addr( pte_level0_section* pt) { |
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98 | asm volatile ( "mcr p15, 0, %0, c2, c0, 0 \n" |
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99 | : |
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100 | : "r"(pt) |
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101 | ); |
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102 | |||
103 | } |
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104 | |||
105 | /// Page table that holds 1:1 mapping for kernel starting |
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106 | extern pte_level0_section page_table[4096]; |
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107 | |||
108 | |||
109 | /** Set page table entry to point no frame, be read/write by kernel, |
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110 | * no access by user, become to domain 0, no cache or buffer |
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111 | * \param pte page table entry to set |
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112 | * \param frame frame number of first frame 1MB section |
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113 | * Note: If frame not aligned it's used first lower 1MB aligned frame |
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114 | */ |
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115 | void init_pte_level0_section_entry( pte_level0_section* pte, unsigned frame); |
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116 | |||
117 | /// Sets memory mapping for kernel |
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118 | void mm_kernel_mapping(void); |
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119 | |||
120 | #endif |
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121 | |||
122 | /** @} |
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123 | */ |
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124 |