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2198 | jancik | 1 | /* |
2236 | kebrt | 2 | * Copyright (c) 2007 Pavel Jancik, Michal Kebrt |
2198 | jancik | 3 | * All rights reserved. |
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 | |||
2236 | kebrt | 29 | /** @addtogroup arm32boot |
2198 | jancik | 30 | * @{ |
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 | |||
2236 | kebrt | 39 | #ifndef __ASM__ |
2198 | jancik | 40 | #include "types.h" |
2236 | kebrt | 41 | #endif |
2198 | jancik | 42 | |
43 | |||
2234 | jancik | 44 | #define FRAME_WIDTH 12 /* 4KB frames */ |
45 | #define FRAME_SIZE (1 << FRAME_WIDTH) |
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2198 | jancik | 46 | |
2234 | jancik | 47 | #define PAGE_WIDTH FRAME_WIDTH |
48 | #define PAGE_SIZE FRAME_SIZE |
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2198 | jancik | 49 | |
50 | #ifndef __ASM__ |
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2234 | jancik | 51 | # define KA2PA(x) (((uintptr_t) (x)) - 0x80000000) |
52 | # define PA2KA(x) (((uintptr_t) (x)) + 0x80000000) |
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2198 | jancik | 53 | #else |
2234 | jancik | 54 | # define KA2PA(x) ((x) - 0x80000000) |
55 | # define PA2KA(x) ((x) + 0x80000000) |
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2198 | jancik | 56 | #endif |
57 | |||
2236 | kebrt | 58 | /** Number of entries in PTL0 */ |
2239 | jancik | 59 | #define PTL0_ENTRIES_ARCH (1<<12) /* 4096 */ |
2198 | jancik | 60 | |
2234 | jancik | 61 | /** Frames per 1MB section */ |
62 | #define FRAMES_PER_SECTION ( ( 1 << 20 ) / FRAME_SIZE ) |
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2198 | jancik | 63 | |
2236 | kebrt | 64 | /** Converts adress to frame number */ |
2234 | jancik | 65 | #define ADDR2PFN( addr ) ( ((uintptr_t)(addr))>>FRAME_WIDTH ) |
2198 | jancik | 66 | |
2236 | kebrt | 67 | /** Descriptor type that signs "section" page table entry |
68 | * (one-level paging with 1MB sized pages) */ |
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2234 | jancik | 69 | #define PTE_DESCRIPTOR_SECTION 2 |
2198 | jancik | 70 | |
2236 | kebrt | 71 | /** Access rights to page table: user-no access, kernel-read/write */ |
2234 | jancik | 72 | #define PTE_AP_USER_NO_KERNEL_RW 1 |
2198 | jancik | 73 | |
2236 | kebrt | 74 | #ifndef __ASM__ |
2234 | jancik | 75 | |
2254 | kebrt | 76 | |
2236 | kebrt | 77 | /** Page table level 0 entry - "section" format (one-level paging, 1MB sized |
78 | * pages). Used only for booting the kernel. */ |
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2198 | jancik | 79 | typedef struct { |
2254 | kebrt | 80 | unsigned descriptor_type : 2; |
2198 | jancik | 81 | unsigned bufferable : 1; |
82 | unsigned cacheable : 1; |
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2241 | kebrt | 83 | unsigned impl_specific : 1; |
2198 | jancik | 84 | unsigned domain : 4; |
85 | unsigned should_be_zero_1 : 1; |
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86 | unsigned access_permission : 2; |
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87 | unsigned should_be_zero_2 : 8; |
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88 | unsigned section_base_addr : 12; |
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2257 | jancik | 89 | } __attribute__ ((packed)) pte_level0_section_t; |
2198 | jancik | 90 | |
91 | |||
2254 | kebrt | 92 | /** Page table that holds 1:1 mapping for booting the kernel. */ |
2257 | jancik | 93 | extern pte_level0_section_t page_table[PTL0_ENTRIES_ARCH]; |
2254 | kebrt | 94 | |
95 | |||
96 | /** Starts the MMU - initializes page table and enables paging. */ |
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97 | void mmu_start(void); |
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98 | |||
99 | |||
100 | /** Enables paging. */ |
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101 | static inline void enable_paging() |
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102 | { |
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103 | /* c3 - each two bits controls access to the one of domains (16) |
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104 | * 0b01 - behave as a client (user) of a domain |
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105 | */ |
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106 | asm volatile ( |
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107 | // behave as a client of domains |
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108 | "ldr r0, =0x55555555 \n" |
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109 | "mcr p15, 0, r0, c3, c0, 0 \n" |
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110 | // current settings |
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111 | "mrc p15, 0, r0, c1, c0, 0 \n" |
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112 | /* TODO: talk to Alf why needed |
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113 | // mask to disable aligment checks; system & rom bit set to 0 (has no |
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114 | // special effect) |
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115 | "ldr r1, =0xfffffe8f \n" |
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116 | "and r0, r0, r1 \n" |
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117 | */ |
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118 | // mask to enable paging |
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119 | "ldr r1, =0x00000001 \n" |
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120 | "orr r0, r0, r1 \n" |
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121 | // store settings |
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122 | "mcr p15, 0, r0, c1, c0, 0 \n" |
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123 | : |
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124 | : |
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125 | : "r0", "r1" |
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126 | ); |
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127 | } |
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128 | |||
129 | |||
2236 | kebrt | 130 | /** Sets the address of level 0 page table. |
131 | * \param pt pointer to the page table to set |
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2198 | jancik | 132 | */ |
2257 | jancik | 133 | static inline void set_ptl0_address(pte_level0_section_t* pt) |
2254 | kebrt | 134 | { |
2198 | jancik | 135 | asm volatile ( "mcr p15, 0, %0, c2, c0, 0 \n" |
2257 | jancik | 136 | : |
2254 | kebrt | 137 | : "r"(pt) |
2198 | jancik | 138 | ); |
139 | } |
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140 | |||
2236 | kebrt | 141 | #endif |
2198 | jancik | 142 | |
143 | #endif |
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144 | |||
145 | /** @} |
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146 | */ |
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147 |