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Rev | Author | Line No. | Line |
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913 | decky | 1 | # |
2 | # Copyright (C) 2006 Martin Decky |
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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 | |||
1058 | decky | 29 | #include "asm.h" |
913 | decky | 30 | #include "regname.h" |
31 | |||
914 | decky | 32 | .data |
33 | |||
34 | flush_buffer: |
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933 | decky | 35 | .space (L1_CACHE_LINES * L1_CACHE_BYTES) |
914 | decky | 36 | |
913 | decky | 37 | .text |
38 | |||
1058 | decky | 39 | .global halt |
913 | decky | 40 | .global jump_to_kernel |
41 | |||
1058 | decky | 42 | halt: |
43 | b halt |
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913 | decky | 44 | |
45 | jump_to_kernel: |
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1022 | decky | 46 | |
1058 | decky | 47 | # r3 = memmap (pa) |
48 | # r4 = trans (pa) |
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1068 | decky | 49 | # r5 = kernel size |
1058 | decky | 50 | # r6 = real_mode (pa) |
1022 | decky | 51 | |
1058 | decky | 52 | mtspr srr0, r6 |
1022 | decky | 53 | |
54 | # jumps to real_mode |
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55 | |||
1058 | decky | 56 | mfmsr r31 |
57 | lis r30, ~0@h |
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58 | ori r30, r30, ~(msr_ir | msr_dr)@l |
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59 | and r31, r31, r30 |
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60 | mtspr srr1, r31 |
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1022 | decky | 61 | rfi |
62 | |||
63 | .section REALMODE |
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1058 | decky | 64 | .align PAGE_WIDTH |
1022 | decky | 65 | .global real_mode |
66 | |||
67 | real_mode: |
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1058 | decky | 68 | |
69 | # copy kernel to proper location |
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70 | # |
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71 | # r4 = trans (pa) |
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1068 | decky | 72 | # r5 = kernel size |
1058 | decky | 73 | |
1068 | decky | 74 | li r31, PAGE_SIZE >> 2 |
1058 | decky | 75 | li r30, 0 |
76 | |||
77 | page_copy: |
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78 | |||
79 | cmpwi r5, 0 |
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80 | beq copy_end |
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81 | |||
1068 | decky | 82 | # copy page |
1058 | decky | 83 | |
84 | mtctr r31 |
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85 | lwz r29, 0(r4) |
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86 | |||
87 | copy_loop: |
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88 | |||
89 | lwz r28, 0(r29) |
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90 | stw r28, 0(r30) |
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91 | |||
92 | addi r29, r29, 4 |
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93 | addi r30, r30, 4 |
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1068 | decky | 94 | subi r5, r5, 4 |
1058 | decky | 95 | |
1068 | decky | 96 | cmpwi r5, 0 |
97 | beq copy_end |
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98 | |||
1058 | decky | 99 | bdnz copy_loop |
100 | |||
101 | addi r4, r4, 4 |
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102 | b page_copy |
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103 | |||
104 | copy_end: |
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1068 | decky | 105 | |
106 | # invalidate segment registers |
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1022 | decky | 107 | |
1071 | decky | 108 | li r31, 16 |
109 | mtctr r31 |
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110 | li r31, 0 |
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111 | li r30, 0 |
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112 | |||
1022 | decky | 113 | seg_fill: |
114 | |||
1071 | decky | 115 | mtsrin r30, r31 |
116 | addis r31, r31, 0x1000 # move to next SR |
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117 | |||
118 | bdnz seg_fill |
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1022 | decky | 119 | |
1068 | decky | 120 | # invalidate block address translation registers |
121 | |||
122 | mtspr ibat0u, r30 |
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123 | mtspr ibat0l, r30 |
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124 | |||
125 | mtspr ibat1u, r30 |
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126 | mtspr ibat1l, r30 |
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127 | |||
128 | mtspr ibat2u, r30 |
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129 | mtspr ibat2l, r30 |
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130 | |||
131 | mtspr ibat3u, r30 |
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132 | mtspr ibat3l, r30 |
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133 | |||
134 | mtspr dbat0u, r30 |
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135 | mtspr dbat0l, r30 |
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136 | |||
137 | mtspr dbat1u, r30 |
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138 | mtspr dbat1l, r30 |
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139 | |||
140 | mtspr dbat2u, r30 |
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141 | mtspr dbat2l, r30 |
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142 | |||
143 | mtspr dbat3u, r30 |
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144 | mtspr dbat3l, r30 |
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145 | |||
1058 | decky | 146 | # create identity mapping |
147 | |||
1068 | decky | 148 | # FIXME: map exactly the size of RAM |
149 | |||
150 | lis r31, 0x8000 |
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151 | ori r31, r31, 0x0ffe |
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152 | |||
153 | lis r30, 0x0000 |
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154 | ori r30, r30, 0x0002 |
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155 | |||
156 | mtspr ibat0u, r31 |
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157 | mtspr ibat0l, r30 |
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158 | |||
159 | mtspr dbat0u, r31 |
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160 | mtspr dbat0l, r30 |
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161 | |||
162 | # FIXME: temporal framebuffer mapping |
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163 | |||
164 | lis r31, 0xf000 |
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165 | ori r31, r31, 0x0ffe |
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166 | |||
167 | lis r30, 0x8400 |
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168 | ori r30, r30, 0x0002 |
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169 | |||
170 | mtspr dbat1u, r31 |
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171 | mtspr dbat1l, r30 |
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172 | |||
1058 | decky | 173 | tlbia |
174 | |||
175 | # start the kernel |
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1022 | decky | 176 | # |
1058 | decky | 177 | # r3 = memmap (pa) |
1022 | decky | 178 | |
1058 | decky | 179 | lis r31, KERNEL_START_ADDR@ha |
180 | addi r31, r31, KERNEL_START_ADDR@l |
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1022 | decky | 181 | |
1058 | decky | 182 | mtspr srr0, r31 |
1022 | decky | 183 | |
1058 | decky | 184 | mfmsr r31 |
185 | ori r31, r31, (msr_ir | msr_dr)@l |
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186 | mtspr srr1, r31 |
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187 | |||
1022 | decky | 188 | rfi |
1058 | decky | 189 | |
190 | .align PAGE_WIDTH |
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191 | .global trans |
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192 | trans: |
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193 | .space (TRANS_SIZE * TRANS_ITEM_SIZE) |