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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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31 | |||
32 | .text |
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33 | |||
34 | .global halt |
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35 | .global memcpy |
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36 | .global jump_to_kernel |
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37 | |||
38 | halt: |
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39 | b halt |
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40 | |||
41 | memcpy: |
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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 | |||
104 | jump_to_kernel: |
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105 | |||
106 | # r3 = bootinfo (pa) |
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107 | # r4 = bootinfo_size |
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108 | # r5 = trans (pa) |
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1395 | decky | 109 | # r6 = bytes to copy |
110 | # r7 = real_mode (pa) |
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1800 | decky | 111 | # r8 = framebuffer (pa) |
112 | # r9 = scanline |
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1157 | decky | 113 | |
1395 | decky | 114 | # disable interrupts |
1157 | decky | 115 | |
1395 | decky | 116 | mfmsr r31 |
117 | rlwinm r31, r31, 0, 17, 15 |
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118 | mtmsr r31 |
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119 | |||
120 | # set real_mode meeting point address |
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121 | |||
122 | mtspr srr0, r7 |
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123 | |||
1157 | decky | 124 | # jumps to real_mode |
125 | |||
1166 | decky | 126 | mfmsr r31 |
1157 | decky | 127 | lis r30, ~0@h |
128 | ori r30, r30, ~(msr_ir | msr_dr)@l |
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129 | and r31, r31, r30 |
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130 | mtspr srr1, r31 |
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131 | |||
132 | sync |
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133 | isync |
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134 | rfid |
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135 | |||
1395 | decky | 136 | .section REALMODE, "ax" |
1157 | decky | 137 | .align PAGE_WIDTH |
138 | .global real_mode |
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139 | |||
140 | real_mode: |
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141 | |||
142 | # copy kernel to proper location |
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143 | # |
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144 | # r5 = trans (pa) |
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1395 | decky | 145 | # r6 = bytes to copy |
1800 | decky | 146 | # r8 = framebuffer (pa) |
147 | # r9 = scanline |
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1157 | decky | 148 | |
149 | li r31, PAGE_SIZE >> 2 |
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150 | li r30, 0 |
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151 | |||
152 | page_copy: |
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153 | |||
154 | cmpwi r6, 0 |
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155 | beq copy_end |
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156 | |||
157 | # copy page |
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158 | |||
159 | mtctr r31 |
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160 | lwz r29, 0(r5) |
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161 | |||
162 | copy_loop: |
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163 | |||
164 | lwz r28, 0(r29) |
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165 | stw r28, 0(r30) |
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166 | |||
167 | addi r29, r29, 4 |
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168 | addi r30, r30, 4 |
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169 | subi r6, r6, 4 |
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170 | |||
171 | cmpwi r6, 0 |
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172 | beq copy_end |
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173 | |||
174 | bdnz copy_loop |
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1800 | decky | 175 | |
1157 | decky | 176 | addi r5, r5, 4 |
177 | b page_copy |
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178 | |||
179 | copy_end: |
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180 | |||
1395 | decky | 181 | # initially fill segment registers |
1800 | decky | 182 | |
1157 | decky | 183 | li r31, 0 |
1800 | decky | 184 | |
185 | li r29, 8 |
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186 | mtctr r29 |
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187 | li r30, 0 # ASID 0 (VSIDs 0 .. 7) |
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1157 | decky | 188 | |
1800 | decky | 189 | seg_fill_uspace: |
1157 | decky | 190 | |
191 | mtsrin r30, r31 |
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1800 | decky | 192 | addi r30, r30, 1 |
1157 | decky | 193 | addis r31, r31, 0x1000 # move to next SR |
194 | |||
1800 | decky | 195 | bdnz seg_fill_uspace |
1157 | decky | 196 | |
1800 | decky | 197 | li r29, 8 |
198 | mtctr r29 |
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199 | lis r30, 0x4000 # priviledged access only |
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200 | ori r30, r30, 8 # ASID 0 (VSIDs 8 .. 15) |
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201 | |||
202 | seg_fill_kernel: |
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203 | |||
204 | mtsrin r30, r31 |
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205 | addi r30, r30, 1 |
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206 | addis r31, r31, 0x1000 # move to next SR |
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207 | |||
208 | bdnz seg_fill_kernel |
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209 | |||
210 | # create empty Page Hash Table |
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211 | # on top of memory, size 64 KB |
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212 | |||
213 | lwz r31, 0(r3) # r31 = memory size |
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214 | |||
215 | lis r30, 65536@h |
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216 | ori r30, r30, 65536@l # r30 = 65536 |
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217 | |||
218 | subi r29, r30, 1 # r29 = 65535 |
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219 | |||
220 | sub r31, r31, r30 |
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221 | andc r31, r31, r29 # pht = ALIGN_DOWN(memory_size - 65536, 65536) |
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222 | |||
223 | mtsdr1 r31 |
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224 | |||
225 | li r29, 2 |
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226 | srw r30, r30, r29 # r30 = 16384 |
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227 | li r29, 0 |
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228 | |||
229 | pht_clear: |
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230 | |||
231 | # write zeroes |
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232 | |||
233 | stw r29, 0(r31) |
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234 | |||
235 | addi r31, r31, 4 |
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236 | subi r30, r30, 4 |
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237 | |||
238 | cmpwi r30, 0 |
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239 | beq clear_end |
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240 | |||
241 | bdnz pht_clear |
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242 | |||
243 | clear_end: |
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244 | |||
1395 | decky | 245 | tlbsync |
1157 | decky | 246 | |
247 | # start the kernel |
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248 | # |
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1800 | decky | 249 | # pc = KERNEL_START_ADDR |
1157 | decky | 250 | # r3 = bootinfo (pa) |
1800 | decky | 251 | # sprg0 = KA2PA(KERNEL_START_ADDR) |
252 | # sprg3 = physical memory size |
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253 | # sp = 0 (pa) |
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1157 | decky | 254 | |
255 | lis r31, KERNEL_START_ADDR@ha |
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256 | addi r31, r31, KERNEL_START_ADDR@l |
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257 | |||
258 | mtspr srr0, r31 |
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259 | |||
1800 | decky | 260 | subis r31, r31, 0x8000 |
261 | mtsprg0 r31 |
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262 | |||
263 | lwz r31, 0(r3) |
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264 | mtsprg3 r31 |
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265 | |||
266 | li sp, 0 |
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267 | |||
1166 | decky | 268 | mfmsr r31 |
1157 | decky | 269 | ori r31, r31, (msr_ir | msr_dr)@l |
270 | mtspr srr1, r31 |
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271 | |||
272 | sync |
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273 | isync |
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274 | rfid |
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275 | |||
276 | .align PAGE_WIDTH |
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277 | .global trans |
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278 | trans: |
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279 | .space (TRANS_SIZE * TRANS_ITEM_SIZE) |