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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 | |||
32 | .text |
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33 | |||
1058 | decky | 34 | .global halt |
1075 | decky | 35 | .global memcpy |
913 | decky | 36 | .global jump_to_kernel |
37 | |||
1058 | decky | 38 | halt: |
39 | b halt |
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913 | decky | 40 | |
1075 | decky | 41 | memcpy: |
42 | srwi. r7, r5, 3 |
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43 | addi r6, r3, -4 |
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44 | addi r4, r4, -4 |
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45 | beq 2f |
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46 | |||
47 | andi. r0, r6, 3 |
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48 | mtctr r7 |
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49 | bne 5f |
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50 | |||
51 | 1: |
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52 | |||
53 | lwz r7, 4(r4) |
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54 | lwzu r8, 8(r4) |
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55 | stw r7, 4(r6) |
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56 | stwu r8, 8(r6) |
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57 | bdnz 1b |
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58 | |||
59 | andi. r5, r5, 7 |
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60 | |||
61 | 2: |
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62 | |||
63 | cmplwi 0, r5, 4 |
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64 | blt 3f |
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65 | |||
66 | lwzu r0, 4(r4) |
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67 | addi r5, r5, -4 |
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68 | stwu r0, 4(r6) |
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69 | |||
70 | 3: |
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71 | |||
72 | cmpwi 0, r5, 0 |
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73 | beqlr |
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74 | mtctr r5 |
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75 | addi r4, r4, 3 |
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76 | addi r6, r6, 3 |
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77 | |||
78 | 4: |
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79 | |||
80 | lbzu r0, 1(r4) |
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81 | stbu r0, 1(r6) |
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82 | bdnz 4b |
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83 | blr |
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84 | |||
85 | 5: |
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86 | |||
87 | subfic r0, r0, 4 |
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88 | mtctr r0 |
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89 | |||
90 | 6: |
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91 | |||
92 | lbz r7, 4(r4) |
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93 | addi r4, r4, 1 |
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94 | stb r7, 4(r6) |
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95 | addi r6, r6, 1 |
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96 | bdnz 6b |
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97 | subf r5, r0, r5 |
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98 | rlwinm. r7, r5, 32-3, 3, 31 |
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99 | beq 2b |
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100 | mtctr r7 |
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101 | b 1b |
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102 | |||
103 | |||
913 | decky | 104 | jump_to_kernel: |
1022 | decky | 105 | |
1131 | decky | 106 | # r3 = bootinfo (pa) |
107 | # r4 = bootinfo_size |
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108 | # r5 = trans (pa) |
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109 | # r6 = kernel size |
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1146 | decky | 110 | # r7 = framebuffer (pa) |
111 | # r8 = real_mode (pa) |
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1022 | decky | 112 | |
1146 | decky | 113 | mtspr srr0, r8 |
1022 | decky | 114 | |
115 | # jumps to real_mode |
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116 | |||
1058 | decky | 117 | mfmsr r31 |
118 | lis r30, ~0@h |
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119 | ori r30, r30, ~(msr_ir | msr_dr)@l |
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120 | and r31, r31, r30 |
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121 | mtspr srr1, r31 |
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1157 | decky | 122 | |
123 | sync |
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124 | isync |
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1022 | decky | 125 | rfi |
126 | |||
1214 | decky | 127 | .section REALMODE, "ax" |
1058 | decky | 128 | .align PAGE_WIDTH |
1022 | decky | 129 | .global real_mode |
130 | |||
131 | real_mode: |
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1058 | decky | 132 | |
133 | # copy kernel to proper location |
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134 | # |
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1131 | decky | 135 | # r5 = trans (pa) |
136 | # r6 = kernel size |
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1146 | decky | 137 | # r7 = framebuffer (pa) |
1058 | decky | 138 | |
1068 | decky | 139 | li r31, PAGE_SIZE >> 2 |
1058 | decky | 140 | li r30, 0 |
141 | |||
142 | page_copy: |
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143 | |||
1131 | decky | 144 | cmpwi r6, 0 |
1058 | decky | 145 | beq copy_end |
146 | |||
1068 | decky | 147 | # copy page |
1058 | decky | 148 | |
149 | mtctr r31 |
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1131 | decky | 150 | lwz r29, 0(r5) |
1058 | decky | 151 | |
152 | copy_loop: |
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153 | |||
154 | lwz r28, 0(r29) |
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155 | stw r28, 0(r30) |
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156 | |||
157 | addi r29, r29, 4 |
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158 | addi r30, r30, 4 |
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1131 | decky | 159 | subi r6, r6, 4 |
1058 | decky | 160 | |
1131 | decky | 161 | cmpwi r6, 0 |
1068 | decky | 162 | beq copy_end |
163 | |||
1058 | decky | 164 | bdnz copy_loop |
165 | |||
1131 | decky | 166 | addi r5, r5, 4 |
1058 | decky | 167 | b page_copy |
168 | |||
169 | copy_end: |
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1068 | decky | 170 | |
1214 | decky | 171 | # initially fill segment registers |
1022 | decky | 172 | |
1071 | decky | 173 | li r31, 16 |
174 | mtctr r31 |
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175 | li r31, 0 |
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1214 | decky | 176 | li r30, 0x2000 |
1071 | decky | 177 | |
1022 | decky | 178 | seg_fill: |
179 | |||
1071 | decky | 180 | mtsrin r30, r31 |
1214 | decky | 181 | addi r30, r30, 0x111 |
1071 | decky | 182 | addis r31, r31, 0x1000 # move to next SR |
183 | |||
184 | bdnz seg_fill |
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1022 | decky | 185 | |
1068 | decky | 186 | # invalidate block address translation registers |
187 | |||
188 | mtspr ibat0u, r30 |
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189 | mtspr ibat0l, r30 |
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190 | |||
191 | mtspr ibat1u, r30 |
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192 | mtspr ibat1l, r30 |
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193 | |||
194 | mtspr ibat2u, r30 |
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195 | mtspr ibat2l, r30 |
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196 | |||
197 | mtspr ibat3u, r30 |
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198 | mtspr ibat3l, r30 |
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199 | |||
200 | mtspr dbat0u, r30 |
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201 | mtspr dbat0l, r30 |
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202 | |||
203 | mtspr dbat1u, r30 |
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204 | mtspr dbat1l, r30 |
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205 | |||
206 | mtspr dbat2u, r30 |
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207 | mtspr dbat2l, r30 |
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208 | |||
209 | mtspr dbat3u, r30 |
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210 | mtspr dbat3l, r30 |
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211 | |||
1058 | decky | 212 | # create identity mapping |
213 | |||
1068 | decky | 214 | # FIXME: map exactly the size of RAM |
215 | |||
216 | lis r31, 0x8000 |
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217 | ori r31, r31, 0x0ffe |
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218 | |||
219 | lis r30, 0x0000 |
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220 | ori r30, r30, 0x0002 |
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221 | |||
222 | mtspr ibat0u, r31 |
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223 | mtspr ibat0l, r30 |
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224 | |||
225 | mtspr dbat0u, r31 |
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226 | mtspr dbat0l, r30 |
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227 | |||
228 | # FIXME: temporal framebuffer mapping |
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229 | |||
230 | lis r31, 0xf000 |
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231 | ori r31, r31, 0x0ffe |
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232 | |||
1146 | decky | 233 | mr r30, r7 |
1068 | decky | 234 | ori r30, r30, 0x0002 |
235 | |||
236 | mtspr dbat1u, r31 |
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237 | mtspr dbat1l, r30 |
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238 | |||
1058 | decky | 239 | tlbia |
240 | |||
241 | # start the kernel |
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1022 | decky | 242 | # |
1131 | decky | 243 | # r3 = bootinfo (pa) |
1022 | decky | 244 | |
1058 | decky | 245 | lis r31, KERNEL_START_ADDR@ha |
246 | addi r31, r31, KERNEL_START_ADDR@l |
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1022 | decky | 247 | |
1058 | decky | 248 | mtspr srr0, r31 |
1022 | decky | 249 | |
1058 | decky | 250 | mfmsr r31 |
251 | ori r31, r31, (msr_ir | msr_dr)@l |
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252 | mtspr srr1, r31 |
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253 | |||
1146 | decky | 254 | sync |
255 | isync |
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1022 | decky | 256 | rfi |
1058 | decky | 257 | |
258 | .align PAGE_WIDTH |
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259 | .global trans |
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260 | trans: |
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261 | .space (TRANS_SIZE * TRANS_ITEM_SIZE) |