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Rev | Author | Line No. | Line |
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1157 | decky | 1 | # |
2071 | jermar | 2 | # Copyright (c) 2006 Martin Decky |
1157 | decky | 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 | |||
29 | #include "asm.h" |
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30 | #include "regname.h" |
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1800 | decky | 31 | #include "debug.inc" |
1157 | decky | 32 | |
33 | .text |
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34 | |||
35 | .global halt |
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36 | .global memcpy |
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37 | .global jump_to_kernel |
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38 | |||
39 | halt: |
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40 | b halt |
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41 | |||
42 | memcpy: |
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43 | srwi. r7, r5, 3 |
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44 | addi r6, r3, -4 |
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45 | addi r4, r4, -4 |
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46 | beq 2f |
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47 | |||
48 | andi. r0, r6, 3 |
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49 | mtctr r7 |
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50 | bne 5f |
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51 | |||
52 | 1: |
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53 | |||
54 | lwz r7, 4(r4) |
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55 | lwzu r8, 8(r4) |
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56 | stw r7, 4(r6) |
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57 | stwu r8, 8(r6) |
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58 | bdnz 1b |
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59 | |||
60 | andi. r5, r5, 7 |
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61 | |||
62 | 2: |
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63 | |||
64 | cmplwi 0, r5, 4 |
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65 | blt 3f |
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66 | |||
67 | lwzu r0, 4(r4) |
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68 | addi r5, r5, -4 |
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69 | stwu r0, 4(r6) |
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70 | |||
71 | 3: |
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72 | |||
73 | cmpwi 0, r5, 0 |
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74 | beqlr |
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75 | mtctr r5 |
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76 | addi r4, r4, 3 |
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77 | addi r6, r6, 3 |
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78 | |||
79 | 4: |
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80 | |||
81 | lbzu r0, 1(r4) |
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82 | stbu r0, 1(r6) |
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83 | bdnz 4b |
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84 | blr |
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85 | |||
86 | 5: |
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87 | |||
88 | subfic r0, r0, 4 |
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89 | mtctr r0 |
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90 | |||
91 | 6: |
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92 | |||
93 | lbz r7, 4(r4) |
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94 | addi r4, r4, 1 |
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95 | stb r7, 4(r6) |
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96 | addi r6, r6, 1 |
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97 | bdnz 6b |
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98 | subf r5, r0, r5 |
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99 | rlwinm. r7, r5, 32-3, 3, 31 |
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100 | beq 2b |
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101 | mtctr r7 |
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102 | b 1b |
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103 | |||
104 | |||
105 | jump_to_kernel: |
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106 | |||
107 | # r3 = bootinfo (pa) |
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108 | # r4 = bootinfo_size |
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109 | # r5 = trans (pa) |
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1395 | decky | 110 | # r6 = bytes to copy |
111 | # r7 = real_mode (pa) |
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1800 | decky | 112 | # r8 = framebuffer (pa) |
113 | # r9 = scanline |
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1157 | decky | 114 | |
1395 | decky | 115 | # disable interrupts |
1157 | decky | 116 | |
1395 | decky | 117 | mfmsr r31 |
118 | rlwinm r31, r31, 0, 17, 15 |
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119 | mtmsr r31 |
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120 | |||
121 | # set real_mode meeting point address |
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122 | |||
123 | mtspr srr0, r7 |
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124 | |||
1157 | decky | 125 | # jumps to real_mode |
126 | |||
1166 | decky | 127 | mfmsr r31 |
1157 | decky | 128 | lis r30, ~0@h |
129 | ori r30, r30, ~(msr_ir | msr_dr)@l |
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130 | and r31, r31, r30 |
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131 | mtspr srr1, r31 |
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132 | |||
133 | sync |
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134 | isync |
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135 | rfid |
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136 | |||
1395 | decky | 137 | .section REALMODE, "ax" |
1157 | decky | 138 | .align PAGE_WIDTH |
139 | .global real_mode |
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140 | |||
141 | real_mode: |
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142 | |||
1800 | decky | 143 | DEBUG_INIT |
144 | DEBUG_real_mode |
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145 | |||
1157 | decky | 146 | # copy kernel to proper location |
147 | # |
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148 | # r5 = trans (pa) |
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1395 | decky | 149 | # r6 = bytes to copy |
1800 | decky | 150 | # r8 = framebuffer (pa) |
151 | # r9 = scanline |
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1157 | decky | 152 | |
153 | li r31, PAGE_SIZE >> 2 |
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154 | li r30, 0 |
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155 | |||
156 | page_copy: |
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157 | |||
158 | cmpwi r6, 0 |
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159 | beq copy_end |
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160 | |||
161 | # copy page |
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162 | |||
163 | mtctr r31 |
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164 | lwz r29, 0(r5) |
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165 | |||
1800 | decky | 166 | DEBUG_INIT |
167 | DEBUG_copy_loop |
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168 | |||
1157 | decky | 169 | copy_loop: |
170 | |||
171 | lwz r28, 0(r29) |
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172 | stw r28, 0(r30) |
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173 | |||
174 | addi r29, r29, 4 |
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175 | addi r30, r30, 4 |
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176 | subi r6, r6, 4 |
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177 | |||
178 | cmpwi r6, 0 |
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179 | beq copy_end |
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180 | |||
181 | bdnz copy_loop |
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1800 | decky | 182 | |
183 | DEBUG_end_copy_loop |
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1157 | decky | 184 | |
185 | addi r5, r5, 4 |
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186 | b page_copy |
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187 | |||
188 | copy_end: |
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189 | |||
1800 | decky | 190 | DEBUG_segments |
191 | |||
1395 | decky | 192 | # initially fill segment registers |
1800 | decky | 193 | |
1157 | decky | 194 | li r31, 0 |
1800 | decky | 195 | |
196 | li r29, 8 |
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197 | mtctr r29 |
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198 | li r30, 0 # ASID 0 (VSIDs 0 .. 7) |
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1157 | decky | 199 | |
1800 | decky | 200 | seg_fill_uspace: |
1157 | decky | 201 | |
202 | mtsrin r30, r31 |
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1800 | decky | 203 | addi r30, r30, 1 |
1157 | decky | 204 | addis r31, r31, 0x1000 # move to next SR |
205 | |||
1800 | decky | 206 | bdnz seg_fill_uspace |
1157 | decky | 207 | |
1800 | decky | 208 | li r29, 8 |
209 | mtctr r29 |
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210 | lis r30, 0x4000 # priviledged access only |
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211 | ori r30, r30, 8 # ASID 0 (VSIDs 8 .. 15) |
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212 | |||
213 | seg_fill_kernel: |
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214 | |||
215 | mtsrin r30, r31 |
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216 | addi r30, r30, 1 |
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217 | addis r31, r31, 0x1000 # move to next SR |
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218 | |||
219 | bdnz seg_fill_kernel |
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220 | |||
221 | # create empty Page Hash Table |
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222 | # on top of memory, size 64 KB |
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223 | |||
224 | DEBUG_pht |
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225 | |||
226 | lwz r31, 0(r3) # r31 = memory size |
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227 | |||
228 | lis r30, 65536@h |
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229 | ori r30, r30, 65536@l # r30 = 65536 |
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230 | |||
231 | subi r29, r30, 1 # r29 = 65535 |
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232 | |||
233 | sub r31, r31, r30 |
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234 | andc r31, r31, r29 # pht = ALIGN_DOWN(memory_size - 65536, 65536) |
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235 | |||
236 | mtsdr1 r31 |
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237 | |||
238 | li r29, 2 |
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239 | srw r30, r30, r29 # r30 = 16384 |
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240 | li r29, 0 |
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241 | |||
242 | pht_clear: |
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243 | |||
244 | # write zeroes |
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245 | |||
246 | stw r29, 0(r31) |
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247 | |||
248 | addi r31, r31, 4 |
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249 | subi r30, r30, 4 |
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250 | |||
251 | cmpwi r30, 0 |
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252 | beq clear_end |
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253 | |||
254 | bdnz pht_clear |
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255 | |||
256 | DEBUG_end_pht_clear |
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257 | |||
258 | clear_end: |
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259 | |||
260 | DEBUG_tlb |
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261 | |||
1157 | decky | 262 | tlbia |
1395 | decky | 263 | tlbsync |
1157 | decky | 264 | |
1800 | decky | 265 | DEBUG_prepare |
266 | |||
1157 | decky | 267 | # start the kernel |
268 | # |
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1800 | decky | 269 | # pc = KERNEL_START_ADDR |
1157 | decky | 270 | # r3 = bootinfo (pa) |
1800 | decky | 271 | # sprg0 = KA2PA(KERNEL_START_ADDR) |
272 | # sprg3 = physical memory size |
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273 | # sp = 0 (pa) |
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1157 | decky | 274 | |
275 | lis r31, KERNEL_START_ADDR@ha |
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276 | addi r31, r31, KERNEL_START_ADDR@l |
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277 | |||
278 | mtspr srr0, r31 |
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279 | |||
1800 | decky | 280 | subis r31, r31, 0x8000 |
281 | mtsprg0 r31 |
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282 | |||
283 | lwz r31, 0(r3) |
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284 | mtsprg3 r31 |
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285 | |||
286 | li sp, 0 |
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287 | |||
1166 | decky | 288 | mfmsr r31 |
1157 | decky | 289 | ori r31, r31, (msr_ir | msr_dr)@l |
290 | mtspr srr1, r31 |
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291 | |||
292 | sync |
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293 | isync |
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1800 | decky | 294 | |
295 | DEBUG_rfi |
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1157 | decky | 296 | rfid |
297 | |||
298 | .align PAGE_WIDTH |
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299 | .global trans |
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300 | trans: |
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301 | .space (TRANS_SIZE * TRANS_ITEM_SIZE) |