Commit | Line | Data |
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9994a338 | 1 | /* |
9994a338 PM |
2 | * This file contains miscellaneous low-level functions. |
3 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
4 | * | |
5 | * Largely rewritten by Cort Dougan (cort@cs.nmt.edu) | |
6 | * and Paul Mackerras. | |
7 | * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com) | |
127efeb2 SR |
8 | * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com) |
9 | * | |
9994a338 PM |
10 | * This program is free software; you can redistribute it and/or |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | * | |
15 | */ | |
16 | ||
9994a338 PM |
17 | #include <linux/sys.h> |
18 | #include <asm/unistd.h> | |
19 | #include <asm/errno.h> | |
20 | #include <asm/processor.h> | |
21 | #include <asm/page.h> | |
22 | #include <asm/cache.h> | |
23 | #include <asm/ppc_asm.h> | |
24 | #include <asm/asm-offsets.h> | |
25 | #include <asm/cputable.h> | |
6cb7bfeb | 26 | #include <asm/thread_info.h> |
1fc711f7 | 27 | #include <asm/kexec.h> |
46f52210 | 28 | #include <asm/ptrace.h> |
9994a338 PM |
29 | |
30 | .text | |
31 | ||
9994a338 PM |
32 | _GLOBAL(call_do_softirq) |
33 | mflr r0 | |
34 | std r0,16(r1) | |
4ae2dcb6 | 35 | stdu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3) |
9994a338 PM |
36 | mr r1,r3 |
37 | bl .__do_softirq | |
38 | ld r1,0(r1) | |
39 | ld r0,16(r1) | |
40 | mtlr r0 | |
41 | blr | |
42 | ||
b9e5b4e6 | 43 | _GLOBAL(call_handle_irq) |
7d12e780 | 44 | ld r8,0(r6) |
9994a338 PM |
45 | mflr r0 |
46 | std r0,16(r1) | |
b9e5b4e6 | 47 | mtctr r8 |
4ae2dcb6 | 48 | stdu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r5) |
7d12e780 | 49 | mr r1,r5 |
b9e5b4e6 | 50 | bctrl |
9994a338 PM |
51 | ld r1,0(r1) |
52 | ld r0,16(r1) | |
53 | mtlr r0 | |
54 | blr | |
9994a338 | 55 | |
9994a338 PM |
56 | .section ".toc","aw" |
57 | PPC64_CACHES: | |
58 | .tc ppc64_caches[TC],ppc64_caches | |
59 | .section ".text" | |
60 | ||
61 | /* | |
62 | * Write any modified data cache blocks out to memory | |
63 | * and invalidate the corresponding instruction cache blocks. | |
64 | * | |
65 | * flush_icache_range(unsigned long start, unsigned long stop) | |
66 | * | |
67 | * flush all bytes from start through stop-1 inclusive | |
68 | */ | |
69 | ||
70 | _KPROBE(__flush_icache_range) | |
71 | ||
72 | /* | |
73 | * Flush the data cache to memory | |
74 | * | |
75 | * Different systems have different cache line sizes | |
76 | * and in some cases i-cache and d-cache line sizes differ from | |
77 | * each other. | |
78 | */ | |
79 | ld r10,PPC64_CACHES@toc(r2) | |
80 | lwz r7,DCACHEL1LINESIZE(r10)/* Get cache line size */ | |
81 | addi r5,r7,-1 | |
82 | andc r6,r3,r5 /* round low to line bdy */ | |
83 | subf r8,r6,r4 /* compute length */ | |
84 | add r8,r8,r5 /* ensure we get enough */ | |
85 | lwz r9,DCACHEL1LOGLINESIZE(r10) /* Get log-2 of cache line size */ | |
86 | srw. r8,r8,r9 /* compute line count */ | |
87 | beqlr /* nothing to do? */ | |
88 | mtctr r8 | |
89 | 1: dcbst 0,r6 | |
90 | add r6,r6,r7 | |
91 | bdnz 1b | |
92 | sync | |
93 | ||
94 | /* Now invalidate the instruction cache */ | |
95 | ||
96 | lwz r7,ICACHEL1LINESIZE(r10) /* Get Icache line size */ | |
97 | addi r5,r7,-1 | |
98 | andc r6,r3,r5 /* round low to line bdy */ | |
99 | subf r8,r6,r4 /* compute length */ | |
100 | add r8,r8,r5 | |
101 | lwz r9,ICACHEL1LOGLINESIZE(r10) /* Get log-2 of Icache line size */ | |
102 | srw. r8,r8,r9 /* compute line count */ | |
103 | beqlr /* nothing to do? */ | |
104 | mtctr r8 | |
105 | 2: icbi 0,r6 | |
106 | add r6,r6,r7 | |
107 | bdnz 2b | |
108 | isync | |
109 | blr | |
110 | .previous .text | |
111 | /* | |
112 | * Like above, but only do the D-cache. | |
113 | * | |
114 | * flush_dcache_range(unsigned long start, unsigned long stop) | |
115 | * | |
116 | * flush all bytes from start to stop-1 inclusive | |
117 | */ | |
118 | _GLOBAL(flush_dcache_range) | |
119 | ||
120 | /* | |
121 | * Flush the data cache to memory | |
122 | * | |
123 | * Different systems have different cache line sizes | |
124 | */ | |
125 | ld r10,PPC64_CACHES@toc(r2) | |
126 | lwz r7,DCACHEL1LINESIZE(r10) /* Get dcache line size */ | |
127 | addi r5,r7,-1 | |
128 | andc r6,r3,r5 /* round low to line bdy */ | |
129 | subf r8,r6,r4 /* compute length */ | |
130 | add r8,r8,r5 /* ensure we get enough */ | |
131 | lwz r9,DCACHEL1LOGLINESIZE(r10) /* Get log-2 of dcache line size */ | |
132 | srw. r8,r8,r9 /* compute line count */ | |
133 | beqlr /* nothing to do? */ | |
134 | mtctr r8 | |
135 | 0: dcbst 0,r6 | |
136 | add r6,r6,r7 | |
137 | bdnz 0b | |
138 | sync | |
139 | blr | |
140 | ||
141 | /* | |
142 | * Like above, but works on non-mapped physical addresses. | |
143 | * Use only for non-LPAR setups ! It also assumes real mode | |
144 | * is cacheable. Used for flushing out the DART before using | |
145 | * it as uncacheable memory | |
146 | * | |
147 | * flush_dcache_phys_range(unsigned long start, unsigned long stop) | |
148 | * | |
149 | * flush all bytes from start to stop-1 inclusive | |
150 | */ | |
151 | _GLOBAL(flush_dcache_phys_range) | |
152 | ld r10,PPC64_CACHES@toc(r2) | |
153 | lwz r7,DCACHEL1LINESIZE(r10) /* Get dcache line size */ | |
154 | addi r5,r7,-1 | |
155 | andc r6,r3,r5 /* round low to line bdy */ | |
156 | subf r8,r6,r4 /* compute length */ | |
157 | add r8,r8,r5 /* ensure we get enough */ | |
158 | lwz r9,DCACHEL1LOGLINESIZE(r10) /* Get log-2 of dcache line size */ | |
159 | srw. r8,r8,r9 /* compute line count */ | |
160 | beqlr /* nothing to do? */ | |
161 | mfmsr r5 /* Disable MMU Data Relocation */ | |
162 | ori r0,r5,MSR_DR | |
163 | xori r0,r0,MSR_DR | |
164 | sync | |
165 | mtmsr r0 | |
166 | sync | |
167 | isync | |
168 | mtctr r8 | |
169 | 0: dcbst 0,r6 | |
170 | add r6,r6,r7 | |
171 | bdnz 0b | |
172 | sync | |
173 | isync | |
174 | mtmsr r5 /* Re-enable MMU Data Relocation */ | |
175 | sync | |
176 | isync | |
177 | blr | |
178 | ||
179 | _GLOBAL(flush_inval_dcache_range) | |
180 | ld r10,PPC64_CACHES@toc(r2) | |
181 | lwz r7,DCACHEL1LINESIZE(r10) /* Get dcache line size */ | |
182 | addi r5,r7,-1 | |
183 | andc r6,r3,r5 /* round low to line bdy */ | |
184 | subf r8,r6,r4 /* compute length */ | |
185 | add r8,r8,r5 /* ensure we get enough */ | |
186 | lwz r9,DCACHEL1LOGLINESIZE(r10)/* Get log-2 of dcache line size */ | |
187 | srw. r8,r8,r9 /* compute line count */ | |
188 | beqlr /* nothing to do? */ | |
189 | sync | |
190 | isync | |
191 | mtctr r8 | |
192 | 0: dcbf 0,r6 | |
193 | add r6,r6,r7 | |
194 | bdnz 0b | |
195 | sync | |
196 | isync | |
197 | blr | |
198 | ||
199 | ||
200 | /* | |
201 | * Flush a particular page from the data cache to RAM. | |
202 | * Note: this is necessary because the instruction cache does *not* | |
203 | * snoop from the data cache. | |
204 | * | |
205 | * void __flush_dcache_icache(void *page) | |
206 | */ | |
207 | _GLOBAL(__flush_dcache_icache) | |
208 | /* | |
209 | * Flush the data cache to memory | |
210 | * | |
211 | * Different systems have different cache line sizes | |
212 | */ | |
213 | ||
214 | /* Flush the dcache */ | |
215 | ld r7,PPC64_CACHES@toc(r2) | |
216 | clrrdi r3,r3,PAGE_SHIFT /* Page align */ | |
217 | lwz r4,DCACHEL1LINESPERPAGE(r7) /* Get # dcache lines per page */ | |
218 | lwz r5,DCACHEL1LINESIZE(r7) /* Get dcache line size */ | |
219 | mr r6,r3 | |
220 | mtctr r4 | |
221 | 0: dcbst 0,r6 | |
222 | add r6,r6,r5 | |
223 | bdnz 0b | |
224 | sync | |
225 | ||
226 | /* Now invalidate the icache */ | |
227 | ||
228 | lwz r4,ICACHEL1LINESPERPAGE(r7) /* Get # icache lines per page */ | |
229 | lwz r5,ICACHEL1LINESIZE(r7) /* Get icache line size */ | |
230 | mtctr r4 | |
231 | 1: icbi 0,r3 | |
232 | add r3,r3,r5 | |
233 | bdnz 1b | |
234 | isync | |
235 | blr | |
9994a338 | 236 | |
ca9d7aea DW |
237 | _GLOBAL(__bswapdi2) |
238 | srdi r8,r3,32 | |
239 | rlwinm r7,r3,8,0xffffffff | |
240 | rlwimi r7,r3,24,0,7 | |
241 | rlwinm r9,r8,8,0xffffffff | |
242 | rlwimi r7,r3,24,16,23 | |
243 | rlwimi r9,r8,24,0,7 | |
244 | rlwimi r9,r8,24,16,23 | |
245 | sldi r7,r7,32 | |
246 | or r3,r7,r9 | |
247 | blr | |
3f639ee8 | 248 | |
9994a338 PM |
249 | #if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_MAPLE) |
250 | /* | |
251 | * Do an IO access in real mode | |
252 | */ | |
253 | _GLOBAL(real_readb) | |
254 | mfmsr r7 | |
255 | ori r0,r7,MSR_DR | |
256 | xori r0,r0,MSR_DR | |
257 | sync | |
258 | mtmsrd r0 | |
259 | sync | |
260 | isync | |
261 | mfspr r6,SPRN_HID4 | |
262 | rldicl r5,r6,32,0 | |
263 | ori r5,r5,0x100 | |
264 | rldicl r5,r5,32,0 | |
265 | sync | |
266 | mtspr SPRN_HID4,r5 | |
267 | isync | |
268 | slbia | |
269 | isync | |
270 | lbz r3,0(r3) | |
271 | sync | |
272 | mtspr SPRN_HID4,r6 | |
273 | isync | |
274 | slbia | |
275 | isync | |
276 | mtmsrd r7 | |
277 | sync | |
278 | isync | |
279 | blr | |
280 | ||
281 | /* | |
282 | * Do an IO access in real mode | |
283 | */ | |
284 | _GLOBAL(real_writeb) | |
285 | mfmsr r7 | |
286 | ori r0,r7,MSR_DR | |
287 | xori r0,r0,MSR_DR | |
288 | sync | |
289 | mtmsrd r0 | |
290 | sync | |
291 | isync | |
292 | mfspr r6,SPRN_HID4 | |
293 | rldicl r5,r6,32,0 | |
294 | ori r5,r5,0x100 | |
295 | rldicl r5,r5,32,0 | |
296 | sync | |
297 | mtspr SPRN_HID4,r5 | |
298 | isync | |
299 | slbia | |
300 | isync | |
301 | stb r3,0(r4) | |
302 | sync | |
303 | mtspr SPRN_HID4,r6 | |
304 | isync | |
305 | slbia | |
306 | isync | |
307 | mtmsrd r7 | |
308 | sync | |
309 | isync | |
310 | blr | |
311 | #endif /* defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_MAPLE) */ | |
312 | ||
39c870d5 OJ |
313 | #ifdef CONFIG_PPC_PASEMI |
314 | ||
39c870d5 OJ |
315 | _GLOBAL(real_205_readb) |
316 | mfmsr r7 | |
317 | ori r0,r7,MSR_DR | |
318 | xori r0,r0,MSR_DR | |
319 | sync | |
320 | mtmsrd r0 | |
321 | sync | |
322 | isync | |
e55174e9 | 323 | LBZCIX(R3,R0,R3) |
39c870d5 OJ |
324 | isync |
325 | mtmsrd r7 | |
326 | sync | |
327 | isync | |
328 | blr | |
329 | ||
330 | _GLOBAL(real_205_writeb) | |
331 | mfmsr r7 | |
332 | ori r0,r7,MSR_DR | |
333 | xori r0,r0,MSR_DR | |
334 | sync | |
335 | mtmsrd r0 | |
336 | sync | |
337 | isync | |
e55174e9 | 338 | STBCIX(R3,R0,R4) |
39c870d5 OJ |
339 | isync |
340 | mtmsrd r7 | |
341 | sync | |
342 | isync | |
343 | blr | |
344 | ||
345 | #endif /* CONFIG_PPC_PASEMI */ | |
346 | ||
347 | ||
e48f7eb2 | 348 | #if defined(CONFIG_CPU_FREQ_PMAC64) || defined(CONFIG_CPU_FREQ_MAPLE) |
4350147a BH |
349 | /* |
350 | * SCOM access functions for 970 (FX only for now) | |
351 | * | |
352 | * unsigned long scom970_read(unsigned int address); | |
353 | * void scom970_write(unsigned int address, unsigned long value); | |
354 | * | |
355 | * The address passed in is the 24 bits register address. This code | |
356 | * is 970 specific and will not check the status bits, so you should | |
357 | * know what you are doing. | |
358 | */ | |
359 | _GLOBAL(scom970_read) | |
360 | /* interrupts off */ | |
361 | mfmsr r4 | |
362 | ori r0,r4,MSR_EE | |
363 | xori r0,r0,MSR_EE | |
364 | mtmsrd r0,1 | |
365 | ||
366 | /* rotate 24 bits SCOM address 8 bits left and mask out it's low 8 bits | |
367 | * (including parity). On current CPUs they must be 0'd, | |
368 | * and finally or in RW bit | |
369 | */ | |
370 | rlwinm r3,r3,8,0,15 | |
371 | ori r3,r3,0x8000 | |
372 | ||
373 | /* do the actual scom read */ | |
374 | sync | |
375 | mtspr SPRN_SCOMC,r3 | |
376 | isync | |
377 | mfspr r3,SPRN_SCOMD | |
378 | isync | |
379 | mfspr r0,SPRN_SCOMC | |
380 | isync | |
381 | ||
382 | /* XXX: fixup result on some buggy 970's (ouch ! we lost a bit, bah | |
383 | * that's the best we can do). Not implemented yet as we don't use | |
384 | * the scom on any of the bogus CPUs yet, but may have to be done | |
385 | * ultimately | |
386 | */ | |
387 | ||
388 | /* restore interrupts */ | |
389 | mtmsrd r4,1 | |
390 | blr | |
391 | ||
392 | ||
393 | _GLOBAL(scom970_write) | |
394 | /* interrupts off */ | |
395 | mfmsr r5 | |
396 | ori r0,r5,MSR_EE | |
397 | xori r0,r0,MSR_EE | |
398 | mtmsrd r0,1 | |
399 | ||
400 | /* rotate 24 bits SCOM address 8 bits left and mask out it's low 8 bits | |
401 | * (including parity). On current CPUs they must be 0'd. | |
402 | */ | |
403 | ||
404 | rlwinm r3,r3,8,0,15 | |
405 | ||
406 | sync | |
407 | mtspr SPRN_SCOMD,r4 /* write data */ | |
408 | isync | |
409 | mtspr SPRN_SCOMC,r3 /* write command */ | |
410 | isync | |
411 | mfspr 3,SPRN_SCOMC | |
412 | isync | |
413 | ||
414 | /* restore interrupts */ | |
415 | mtmsrd r5,1 | |
416 | blr | |
e48f7eb2 | 417 | #endif /* CONFIG_CPU_FREQ_PMAC64 || CONFIG_CPU_FREQ_MAPLE */ |
4350147a BH |
418 | |
419 | ||
9994a338 PM |
420 | /* |
421 | * disable_kernel_fp() | |
422 | * Disable the FPU. | |
423 | */ | |
424 | _GLOBAL(disable_kernel_fp) | |
425 | mfmsr r3 | |
426 | rldicl r0,r3,(63-MSR_FP_LG),1 | |
427 | rldicl r3,r0,(MSR_FP_LG+1),0 | |
428 | mtmsrd r3 /* disable use of fpu now */ | |
429 | isync | |
430 | blr | |
431 | ||
9994a338 PM |
432 | /* kexec_wait(phys_cpu) |
433 | * | |
434 | * wait for the flag to change, indicating this kernel is going away but | |
435 | * the slave code for the next one is at addresses 0 to 100. | |
436 | * | |
3d2cea73 MM |
437 | * This is used by all slaves, even those that did not find a matching |
438 | * paca in the secondary startup code. | |
9994a338 PM |
439 | * |
440 | * Physical (hardware) cpu id should be in r3. | |
441 | */ | |
442 | _GLOBAL(kexec_wait) | |
443 | bl 1f | |
444 | 1: mflr r5 | |
445 | addi r5,r5,kexec_flag-1b | |
446 | ||
447 | 99: HMT_LOW | |
448 | #ifdef CONFIG_KEXEC /* use no memory without kexec */ | |
449 | lwz r4,0(r5) | |
450 | cmpwi 0,r4,0 | |
451 | bnea 0x60 | |
452 | #endif | |
453 | b 99b | |
454 | ||
455 | /* this can be in text because we won't change it until we are | |
456 | * running in real anyways | |
457 | */ | |
458 | kexec_flag: | |
459 | .long 0 | |
460 | ||
461 | ||
462 | #ifdef CONFIG_KEXEC | |
463 | ||
464 | /* kexec_smp_wait(void) | |
465 | * | |
466 | * call with interrupts off | |
467 | * note: this is a terminal routine, it does not save lr | |
468 | * | |
469 | * get phys id from paca | |
9994a338 | 470 | * switch to real mode |
3d2cea73 | 471 | * mark the paca as no longer used |
9994a338 PM |
472 | * join other cpus in kexec_wait(phys_id) |
473 | */ | |
474 | _GLOBAL(kexec_smp_wait) | |
475 | lhz r3,PACAHWCPUID(r13) | |
9994a338 | 476 | bl real_mode |
3d2cea73 MM |
477 | |
478 | li r4,KEXEC_STATE_REAL_MODE | |
479 | stb r4,PACAKEXECSTATE(r13) | |
480 | SYNC | |
481 | ||
9994a338 PM |
482 | b .kexec_wait |
483 | ||
484 | /* | |
485 | * switch to real mode (turn mmu off) | |
486 | * we use the early kernel trick that the hardware ignores bits | |
487 | * 0 and 1 (big endian) of the effective address in real mode | |
488 | * | |
489 | * don't overwrite r3 here, it is live for kexec_wait above. | |
490 | */ | |
491 | real_mode: /* assume normal blr return */ | |
492 | 1: li r9,MSR_RI | |
493 | li r10,MSR_DR|MSR_IR | |
494 | mflr r11 /* return address to SRR0 */ | |
495 | mfmsr r12 | |
496 | andc r9,r12,r9 | |
497 | andc r10,r12,r10 | |
498 | ||
499 | mtmsrd r9,1 | |
500 | mtspr SPRN_SRR1,r10 | |
501 | mtspr SPRN_SRR0,r11 | |
502 | rfid | |
503 | ||
504 | ||
505 | /* | |
1767c8f3 | 506 | * kexec_sequence(newstack, start, image, control, clear_all()) |
9994a338 PM |
507 | * |
508 | * does the grungy work with stack switching and real mode switches | |
509 | * also does simple calls to other code | |
510 | */ | |
511 | ||
512 | _GLOBAL(kexec_sequence) | |
513 | mflr r0 | |
514 | std r0,16(r1) | |
515 | ||
516 | /* switch stacks to newstack -- &kexec_stack.stack */ | |
4ae2dcb6 | 517 | stdu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3) |
9994a338 PM |
518 | mr r1,r3 |
519 | ||
520 | li r0,0 | |
521 | std r0,16(r1) | |
522 | ||
523 | /* save regs for local vars on new stack. | |
524 | * yes, we won't go back, but ... | |
525 | */ | |
526 | std r31,-8(r1) | |
527 | std r30,-16(r1) | |
528 | std r29,-24(r1) | |
529 | std r28,-32(r1) | |
530 | std r27,-40(r1) | |
531 | std r26,-48(r1) | |
532 | std r25,-56(r1) | |
533 | ||
4ae2dcb6 | 534 | stdu r1,-STACK_FRAME_OVERHEAD-64(r1) |
9994a338 PM |
535 | |
536 | /* save args into preserved regs */ | |
537 | mr r31,r3 /* newstack (both) */ | |
538 | mr r30,r4 /* start (real) */ | |
539 | mr r29,r5 /* image (virt) */ | |
540 | mr r28,r6 /* control, unused */ | |
541 | mr r27,r7 /* clear_all() fn desc */ | |
1767c8f3 | 542 | mr r26,r8 /* spare */ |
9994a338 PM |
543 | lhz r25,PACAHWCPUID(r13) /* get our phys cpu from paca */ |
544 | ||
545 | /* disable interrupts, we are overwriting kernel data next */ | |
546 | mfmsr r3 | |
547 | rlwinm r3,r3,0,17,15 | |
548 | mtmsrd r3,1 | |
549 | ||
550 | /* copy dest pages, flush whole dest image */ | |
551 | mr r3,r29 | |
552 | bl .kexec_copy_flush /* (image) */ | |
553 | ||
554 | /* turn off mmu */ | |
555 | bl real_mode | |
556 | ||
ee46a90b MM |
557 | /* copy 0x100 bytes starting at start to 0 */ |
558 | li r3,0 | |
559 | mr r4,r30 /* start, aka phys mem offset */ | |
560 | li r5,0x100 | |
561 | li r6,0 | |
562 | bl .copy_and_flush /* (dest, src, copy limit, start offset) */ | |
563 | 1: /* assume normal blr return */ | |
564 | ||
565 | /* release other cpus to the new kernel secondary start at 0x60 */ | |
566 | mflr r5 | |
567 | li r6,1 | |
568 | stw r6,kexec_flag-1b(5) | |
569 | ||
9994a338 PM |
570 | /* clear out hardware hash page table and tlb */ |
571 | ld r5,0(r27) /* deref function descriptor */ | |
572 | mtctr r5 | |
8d950cb8 | 573 | bctrl /* ppc_md.hpte_clear_all(void); */ |
9994a338 PM |
574 | |
575 | /* | |
576 | * kexec image calling is: | |
577 | * the first 0x100 bytes of the entry point are copied to 0 | |
578 | * | |
579 | * all slaves branch to slave = 0x60 (absolute) | |
580 | * slave(phys_cpu_id); | |
581 | * | |
582 | * master goes to start = entry point | |
583 | * start(phys_cpu_id, start, 0); | |
584 | * | |
585 | * | |
586 | * a wrapper is needed to call existing kernels, here is an approximate | |
587 | * description of one method: | |
588 | * | |
589 | * v2: (2.6.10) | |
590 | * start will be near the boot_block (maybe 0x100 bytes before it?) | |
591 | * it will have a 0x60, which will b to boot_block, where it will wait | |
592 | * and 0 will store phys into struct boot-block and load r3 from there, | |
593 | * copy kernel 0-0x100 and tell slaves to back down to 0x60 again | |
594 | * | |
595 | * v1: (2.6.9) | |
596 | * boot block will have all cpus scanning device tree to see if they | |
597 | * are the boot cpu ????? | |
598 | * other device tree differences (prop sizes, va vs pa, etc)... | |
599 | */ | |
9994a338 PM |
600 | mr r3,r25 # my phys cpu |
601 | mr r4,r30 # start, aka phys mem offset | |
602 | mtlr 4 | |
603 | li r5,0 | |
1767c8f3 | 604 | blr /* image->start(physid, image->start, 0); */ |
9994a338 | 605 | #endif /* CONFIG_KEXEC */ |