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Rev 1787 | Rev 1800 | ||
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Line 26... | Line 26... | ||
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | # |
27 | # |
28 | 28 | ||
29 | #include "asm.h" |
29 | #include "asm.h" |
30 | #include "regname.h" |
30 | #include "regname.h" |
- | 31 | #include "debug.inc" |
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31 | 32 | ||
32 | .text |
33 | .text |
33 | 34 | ||
34 | .global halt |
35 | .global halt |
35 | .global memcpy |
36 | .global memcpy |
Line 106... | Line 107... | ||
106 | # r3 = bootinfo (pa) |
107 | # r3 = bootinfo (pa) |
107 | # r4 = bootinfo_size |
108 | # r4 = bootinfo_size |
108 | # r5 = trans (pa) |
109 | # r5 = trans (pa) |
109 | # r6 = bytes to copy |
110 | # r6 = bytes to copy |
110 | # r7 = real_mode (pa) |
111 | # r7 = real_mode (pa) |
- | 112 | # r8 = framebuffer (pa) |
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- | 113 | # r9 = scanline |
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111 | 114 | ||
112 | # disable interrupts |
115 | # disable interrupts |
113 | 116 | ||
114 | mfmsr r31 |
117 | mfmsr r31 |
115 | rlwinm r31, r31, 0, 17, 15 |
118 | rlwinm r31, r31, 0, 17, 15 |
Line 135... | Line 138... | ||
135 | .align PAGE_WIDTH |
138 | .align PAGE_WIDTH |
136 | .global real_mode |
139 | .global real_mode |
137 | 140 | ||
138 | real_mode: |
141 | real_mode: |
139 | 142 | ||
- | 143 | DEBUG_INIT |
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- | 144 | DEBUG_real_mode |
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- | 145 | ||
140 | # copy kernel to proper location |
146 | # copy kernel to proper location |
141 | # |
147 | # |
142 | # r5 = trans (pa) |
148 | # r5 = trans (pa) |
143 | # r6 = bytes to copy |
149 | # r6 = bytes to copy |
- | 150 | # r8 = framebuffer (pa) |
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- | 151 | # r9 = scanline |
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144 | 152 | ||
145 | li r31, PAGE_SIZE >> 2 |
153 | li r31, PAGE_SIZE >> 2 |
146 | li r30, 0 |
154 | li r30, 0 |
147 | 155 | ||
148 | page_copy: |
156 | page_copy: |
Line 153... | Line 161... | ||
153 | # copy page |
161 | # copy page |
154 | 162 | ||
155 | mtctr r31 |
163 | mtctr r31 |
156 | lwz r29, 0(r5) |
164 | lwz r29, 0(r5) |
157 | 165 | ||
- | 166 | DEBUG_INIT |
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- | 167 | DEBUG_copy_loop |
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- | 168 | ||
158 | copy_loop: |
169 | copy_loop: |
159 | 170 | ||
160 | lwz r28, 0(r29) |
171 | lwz r28, 0(r29) |
161 | stw r28, 0(r30) |
172 | stw r28, 0(r30) |
162 | 173 | ||
Line 166... | Line 177... | ||
166 | 177 | ||
167 | cmpwi r6, 0 |
178 | cmpwi r6, 0 |
168 | beq copy_end |
179 | beq copy_end |
169 | 180 | ||
170 | bdnz copy_loop |
181 | bdnz copy_loop |
- | 182 | ||
- | 183 | DEBUG_end_copy_loop |
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171 | 184 | ||
172 | addi r5, r5, 4 |
185 | addi r5, r5, 4 |
173 | b page_copy |
186 | b page_copy |
174 | 187 | ||
175 | copy_end: |
188 | copy_end: |
176 | 189 | ||
- | 190 | DEBUG_segments |
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- | 191 | ||
177 | # initially fill segment registers |
192 | # initially fill segment registers |
178 | 193 | ||
179 | li r31, 16 |
- | |
180 | mtctr r31 |
- | |
181 | li r31, 0 |
194 | li r31, 0 |
- | 195 | ||
182 | li r30, 0x2000 |
196 | li r29, 8 |
- | 197 | mtctr r29 |
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- | 198 | li r30, 0 # ASID 0 (VSIDs 0 .. 7) |
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183 | 199 | ||
184 | seg_fill: |
200 | seg_fill_uspace: |
- | 201 | ||
- | 202 | mtsrin r30, r31 |
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- | 203 | addi r30, r30, 1 |
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- | 204 | addis r31, r31, 0x1000 # move to next SR |
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- | 205 | ||
- | 206 | bdnz seg_fill_uspace |
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- | 207 | ||
- | 208 | li r29, 8 |
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- | 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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185 | 214 | ||
186 | mtsrin r30, r31 |
215 | mtsrin r30, r31 |
187 | addi r30, r30, 0x111 |
216 | addi r30, r30, 1 |
188 | addis r31, r31, 0x1000 # move to next SR |
217 | addis r31, r31, 0x1000 # move to next SR |
189 | 218 | ||
190 | bdnz seg_fill |
219 | bdnz seg_fill_kernel |
- | 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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191 | 261 | ||
192 | tlbia |
262 | tlbia |
193 | tlbsync |
263 | tlbsync |
194 | 264 | ||
- | 265 | DEBUG_prepare |
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- | 266 | ||
195 | # start the kernel |
267 | # start the kernel |
196 | # |
268 | # |
- | 269 | # pc = KERNEL_START_ADDR |
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197 | # r3 = bootinfo (pa) |
270 | # r3 = bootinfo (pa) |
- | 271 | # sprg0 = KA2PA(KERNEL_START_ADDR) |
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- | 272 | # sprg3 = physical memory size |
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- | 273 | # sp = 0 (pa) |
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198 | 274 | ||
199 | lis r31, KERNEL_START_ADDR@ha |
275 | lis r31, KERNEL_START_ADDR@ha |
200 | addi r31, r31, KERNEL_START_ADDR@l |
276 | addi r31, r31, KERNEL_START_ADDR@l |
201 | 277 | ||
202 | mtspr srr0, r31 |
278 | mtspr srr0, r31 |
203 | 279 | ||
- | 280 | subis r31, r31, 0x8000 |
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- | 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 | ||
204 | mfmsr r31 |
288 | mfmsr r31 |
205 | ori r31, r31, (msr_ir | msr_dr)@l |
289 | ori r31, r31, (msr_ir | msr_dr)@l |
206 | mtspr srr1, r31 |
290 | mtspr srr1, r31 |
207 | 291 | ||
208 | sync |
292 | sync |
209 | isync |
293 | isync |
- | 294 | ||
- | 295 | DEBUG_rfi |
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210 | rfid |
296 | rfid |
211 | 297 | ||
212 | .align PAGE_WIDTH |
298 | .align PAGE_WIDTH |
213 | .global trans |
299 | .global trans |
214 | trans: |
300 | trans: |