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9994a338 PM |
1 | /* |
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 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/config.h> | |
16 | #include <linux/sys.h> | |
17 | #include <asm/unistd.h> | |
18 | #include <asm/errno.h> | |
19 | #include <asm/reg.h> | |
20 | #include <asm/page.h> | |
21 | #include <asm/cache.h> | |
22 | #include <asm/cputable.h> | |
23 | #include <asm/mmu.h> | |
24 | #include <asm/ppc_asm.h> | |
25 | #include <asm/thread_info.h> | |
26 | #include <asm/asm-offsets.h> | |
27 | ||
28 | .text | |
29 | ||
30 | .align 5 | |
31 | _GLOBAL(__delay) | |
32 | cmpwi 0,r3,0 | |
33 | mtctr r3 | |
34 | beqlr | |
35 | 1: bdnz 1b | |
36 | blr | |
37 | ||
38 | /* | |
39 | * Returns (address we're running at) - (address we were linked at) | |
40 | * for use before the text and data are mapped to KERNELBASE. | |
41 | */ | |
42 | _GLOBAL(reloc_offset) | |
43 | mflr r0 | |
44 | bl 1f | |
45 | 1: mflr r3 | |
70620186 | 46 | LOADADDR(r4,1b) |
9994a338 PM |
47 | subf r3,r4,r3 |
48 | mtlr r0 | |
49 | blr | |
50 | ||
51 | /* | |
52 | * add_reloc_offset(x) returns x + reloc_offset(). | |
53 | */ | |
54 | _GLOBAL(add_reloc_offset) | |
55 | mflr r0 | |
56 | bl 1f | |
57 | 1: mflr r5 | |
70620186 | 58 | LOADADDR(r4,1b) |
9994a338 PM |
59 | subf r5,r4,r5 |
60 | add r3,r3,r5 | |
61 | mtlr r0 | |
62 | blr | |
63 | ||
64 | /* | |
65 | * sub_reloc_offset(x) returns x - reloc_offset(). | |
66 | */ | |
67 | _GLOBAL(sub_reloc_offset) | |
68 | mflr r0 | |
69 | bl 1f | |
70 | 1: mflr r5 | |
71 | lis r4,1b@ha | |
72 | addi r4,r4,1b@l | |
73 | subf r5,r4,r5 | |
74 | subf r3,r5,r3 | |
75 | mtlr r0 | |
76 | blr | |
77 | ||
78 | /* | |
79 | * reloc_got2 runs through the .got2 section adding an offset | |
80 | * to each entry. | |
81 | */ | |
82 | _GLOBAL(reloc_got2) | |
83 | mflr r11 | |
84 | lis r7,__got2_start@ha | |
85 | addi r7,r7,__got2_start@l | |
86 | lis r8,__got2_end@ha | |
87 | addi r8,r8,__got2_end@l | |
88 | subf r8,r7,r8 | |
89 | srwi. r8,r8,2 | |
90 | beqlr | |
91 | mtctr r8 | |
92 | bl 1f | |
93 | 1: mflr r0 | |
94 | lis r4,1b@ha | |
95 | addi r4,r4,1b@l | |
96 | subf r0,r4,r0 | |
97 | add r7,r0,r7 | |
98 | 2: lwz r0,0(r7) | |
99 | add r0,r0,r3 | |
100 | stw r0,0(r7) | |
101 | addi r7,r7,4 | |
102 | bdnz 2b | |
103 | mtlr r11 | |
104 | blr | |
105 | ||
106 | /* | |
107 | * identify_cpu, | |
108 | * called with r3 = data offset and r4 = CPU number | |
109 | * doesn't change r3 | |
110 | */ | |
111 | _GLOBAL(identify_cpu) | |
112 | addis r8,r3,cpu_specs@ha | |
113 | addi r8,r8,cpu_specs@l | |
114 | mfpvr r7 | |
115 | 1: | |
116 | lwz r5,CPU_SPEC_PVR_MASK(r8) | |
117 | and r5,r5,r7 | |
118 | lwz r6,CPU_SPEC_PVR_VALUE(r8) | |
119 | cmplw 0,r6,r5 | |
120 | beq 1f | |
121 | addi r8,r8,CPU_SPEC_ENTRY_SIZE | |
122 | b 1b | |
123 | 1: | |
124 | addis r6,r3,cur_cpu_spec@ha | |
125 | addi r6,r6,cur_cpu_spec@l | |
126 | sub r8,r8,r3 | |
127 | stw r8,0(r6) | |
128 | blr | |
129 | ||
130 | /* | |
131 | * do_cpu_ftr_fixups - goes through the list of CPU feature fixups | |
132 | * and writes nop's over sections of code that don't apply for this cpu. | |
133 | * r3 = data offset (not changed) | |
134 | */ | |
135 | _GLOBAL(do_cpu_ftr_fixups) | |
136 | /* Get CPU 0 features */ | |
137 | addis r6,r3,cur_cpu_spec@ha | |
138 | addi r6,r6,cur_cpu_spec@l | |
139 | lwz r4,0(r6) | |
140 | add r4,r4,r3 | |
141 | lwz r4,CPU_SPEC_FEATURES(r4) | |
142 | ||
143 | /* Get the fixup table */ | |
144 | addis r6,r3,__start___ftr_fixup@ha | |
145 | addi r6,r6,__start___ftr_fixup@l | |
146 | addis r7,r3,__stop___ftr_fixup@ha | |
147 | addi r7,r7,__stop___ftr_fixup@l | |
148 | ||
149 | /* Do the fixup */ | |
150 | 1: cmplw 0,r6,r7 | |
151 | bgelr | |
152 | addi r6,r6,16 | |
153 | lwz r8,-16(r6) /* mask */ | |
154 | and r8,r8,r4 | |
155 | lwz r9,-12(r6) /* value */ | |
156 | cmplw 0,r8,r9 | |
157 | beq 1b | |
158 | lwz r8,-8(r6) /* section begin */ | |
159 | lwz r9,-4(r6) /* section end */ | |
160 | subf. r9,r8,r9 | |
161 | beq 1b | |
162 | /* write nops over the section of code */ | |
163 | /* todo: if large section, add a branch at the start of it */ | |
164 | srwi r9,r9,2 | |
165 | mtctr r9 | |
166 | add r8,r8,r3 | |
167 | lis r0,0x60000000@h /* nop */ | |
168 | 3: stw r0,0(r8) | |
169 | andi. r10,r4,CPU_FTR_SPLIT_ID_CACHE@l | |
170 | beq 2f | |
171 | dcbst 0,r8 /* suboptimal, but simpler */ | |
172 | sync | |
173 | icbi 0,r8 | |
174 | 2: addi r8,r8,4 | |
175 | bdnz 3b | |
176 | sync /* additional sync needed on g4 */ | |
177 | isync | |
178 | b 1b | |
179 | ||
180 | /* | |
181 | * call_setup_cpu - call the setup_cpu function for this cpu | |
182 | * r3 = data offset, r24 = cpu number | |
183 | * | |
184 | * Setup function is called with: | |
185 | * r3 = data offset | |
186 | * r4 = ptr to CPU spec (relocated) | |
187 | */ | |
188 | _GLOBAL(call_setup_cpu) | |
189 | addis r4,r3,cur_cpu_spec@ha | |
190 | addi r4,r4,cur_cpu_spec@l | |
191 | lwz r4,0(r4) | |
192 | add r4,r4,r3 | |
193 | lwz r5,CPU_SPEC_SETUP(r4) | |
194 | cmpi 0,r5,0 | |
195 | add r5,r5,r3 | |
196 | beqlr | |
197 | mtctr r5 | |
198 | bctr | |
199 | ||
200 | #if defined(CONFIG_CPU_FREQ_PMAC) && defined(CONFIG_6xx) | |
201 | ||
202 | /* This gets called by via-pmu.c to switch the PLL selection | |
203 | * on 750fx CPU. This function should really be moved to some | |
204 | * other place (as most of the cpufreq code in via-pmu | |
205 | */ | |
206 | _GLOBAL(low_choose_750fx_pll) | |
207 | /* Clear MSR:EE */ | |
208 | mfmsr r7 | |
209 | rlwinm r0,r7,0,17,15 | |
210 | mtmsr r0 | |
211 | ||
212 | /* If switching to PLL1, disable HID0:BTIC */ | |
213 | cmplwi cr0,r3,0 | |
214 | beq 1f | |
215 | mfspr r5,SPRN_HID0 | |
216 | rlwinm r5,r5,0,27,25 | |
217 | sync | |
218 | mtspr SPRN_HID0,r5 | |
219 | isync | |
220 | sync | |
221 | ||
222 | 1: | |
223 | /* Calc new HID1 value */ | |
224 | mfspr r4,SPRN_HID1 /* Build a HID1:PS bit from parameter */ | |
225 | rlwinm r5,r3,16,15,15 /* Clear out HID1:PS from value read */ | |
226 | rlwinm r4,r4,0,16,14 /* Could have I used rlwimi here ? */ | |
227 | or r4,r4,r5 | |
228 | mtspr SPRN_HID1,r4 | |
229 | ||
230 | /* Store new HID1 image */ | |
231 | rlwinm r6,r1,0,0,18 | |
232 | lwz r6,TI_CPU(r6) | |
233 | slwi r6,r6,2 | |
234 | addis r6,r6,nap_save_hid1@ha | |
235 | stw r4,nap_save_hid1@l(r6) | |
236 | ||
237 | /* If switching to PLL0, enable HID0:BTIC */ | |
238 | cmplwi cr0,r3,0 | |
239 | bne 1f | |
240 | mfspr r5,SPRN_HID0 | |
241 | ori r5,r5,HID0_BTIC | |
242 | sync | |
243 | mtspr SPRN_HID0,r5 | |
244 | isync | |
245 | sync | |
246 | ||
247 | 1: | |
248 | /* Return */ | |
249 | mtmsr r7 | |
250 | blr | |
251 | ||
252 | _GLOBAL(low_choose_7447a_dfs) | |
253 | /* Clear MSR:EE */ | |
254 | mfmsr r7 | |
255 | rlwinm r0,r7,0,17,15 | |
256 | mtmsr r0 | |
257 | ||
258 | /* Calc new HID1 value */ | |
259 | mfspr r4,SPRN_HID1 | |
260 | insrwi r4,r3,1,9 /* insert parameter into bit 9 */ | |
261 | sync | |
262 | mtspr SPRN_HID1,r4 | |
263 | sync | |
264 | isync | |
265 | ||
266 | /* Return */ | |
267 | mtmsr r7 | |
268 | blr | |
269 | ||
270 | #endif /* CONFIG_CPU_FREQ_PMAC && CONFIG_6xx */ | |
271 | ||
272 | /* | |
273 | * complement mask on the msr then "or" some values on. | |
274 | * _nmask_and_or_msr(nmask, value_to_or) | |
275 | */ | |
276 | _GLOBAL(_nmask_and_or_msr) | |
277 | mfmsr r0 /* Get current msr */ | |
278 | andc r0,r0,r3 /* And off the bits set in r3 (first parm) */ | |
279 | or r0,r0,r4 /* Or on the bits in r4 (second parm) */ | |
280 | SYNC /* Some chip revs have problems here... */ | |
281 | mtmsr r0 /* Update machine state */ | |
282 | isync | |
283 | blr /* Done */ | |
284 | ||
285 | ||
286 | /* | |
287 | * Flush MMU TLB | |
288 | */ | |
289 | _GLOBAL(_tlbia) | |
290 | #if defined(CONFIG_40x) | |
291 | sync /* Flush to memory before changing mapping */ | |
292 | tlbia | |
293 | isync /* Flush shadow TLB */ | |
294 | #elif defined(CONFIG_44x) | |
295 | li r3,0 | |
296 | sync | |
297 | ||
298 | /* Load high watermark */ | |
299 | lis r4,tlb_44x_hwater@ha | |
300 | lwz r5,tlb_44x_hwater@l(r4) | |
301 | ||
302 | 1: tlbwe r3,r3,PPC44x_TLB_PAGEID | |
303 | addi r3,r3,1 | |
304 | cmpw 0,r3,r5 | |
305 | ble 1b | |
306 | ||
307 | isync | |
308 | #elif defined(CONFIG_FSL_BOOKE) | |
309 | /* Invalidate all entries in TLB0 */ | |
310 | li r3, 0x04 | |
311 | tlbivax 0,3 | |
312 | /* Invalidate all entries in TLB1 */ | |
313 | li r3, 0x0c | |
314 | tlbivax 0,3 | |
315 | /* Invalidate all entries in TLB2 */ | |
316 | li r3, 0x14 | |
317 | tlbivax 0,3 | |
318 | /* Invalidate all entries in TLB3 */ | |
319 | li r3, 0x1c | |
320 | tlbivax 0,3 | |
321 | msync | |
322 | #ifdef CONFIG_SMP | |
323 | tlbsync | |
324 | #endif /* CONFIG_SMP */ | |
325 | #else /* !(CONFIG_40x || CONFIG_44x || CONFIG_FSL_BOOKE) */ | |
326 | #if defined(CONFIG_SMP) | |
327 | rlwinm r8,r1,0,0,18 | |
328 | lwz r8,TI_CPU(r8) | |
329 | oris r8,r8,10 | |
330 | mfmsr r10 | |
331 | SYNC | |
332 | rlwinm r0,r10,0,17,15 /* clear bit 16 (MSR_EE) */ | |
333 | rlwinm r0,r0,0,28,26 /* clear DR */ | |
334 | mtmsr r0 | |
335 | SYNC_601 | |
336 | isync | |
337 | lis r9,mmu_hash_lock@h | |
338 | ori r9,r9,mmu_hash_lock@l | |
339 | tophys(r9,r9) | |
340 | 10: lwarx r7,0,r9 | |
341 | cmpwi 0,r7,0 | |
342 | bne- 10b | |
343 | stwcx. r8,0,r9 | |
344 | bne- 10b | |
345 | sync | |
346 | tlbia | |
347 | sync | |
348 | TLBSYNC | |
349 | li r0,0 | |
350 | stw r0,0(r9) /* clear mmu_hash_lock */ | |
351 | mtmsr r10 | |
352 | SYNC_601 | |
353 | isync | |
354 | #else /* CONFIG_SMP */ | |
355 | sync | |
356 | tlbia | |
357 | sync | |
358 | #endif /* CONFIG_SMP */ | |
359 | #endif /* ! defined(CONFIG_40x) */ | |
360 | blr | |
361 | ||
362 | /* | |
363 | * Flush MMU TLB for a particular address | |
364 | */ | |
365 | _GLOBAL(_tlbie) | |
366 | #if defined(CONFIG_40x) | |
367 | tlbsx. r3, 0, r3 | |
368 | bne 10f | |
369 | sync | |
370 | /* There are only 64 TLB entries, so r3 < 64, which means bit 25 is clear. | |
371 | * Since 25 is the V bit in the TLB_TAG, loading this value will invalidate | |
372 | * the TLB entry. */ | |
373 | tlbwe r3, r3, TLB_TAG | |
374 | isync | |
375 | 10: | |
376 | #elif defined(CONFIG_44x) | |
377 | mfspr r4,SPRN_MMUCR | |
378 | mfspr r5,SPRN_PID /* Get PID */ | |
379 | rlwimi r4,r5,0,24,31 /* Set TID */ | |
380 | mtspr SPRN_MMUCR,r4 | |
381 | ||
382 | tlbsx. r3, 0, r3 | |
383 | bne 10f | |
384 | sync | |
385 | /* There are only 64 TLB entries, so r3 < 64, | |
386 | * which means bit 22, is clear. Since 22 is | |
387 | * the V bit in the TLB_PAGEID, loading this | |
388 | * value will invalidate the TLB entry. | |
389 | */ | |
390 | tlbwe r3, r3, PPC44x_TLB_PAGEID | |
391 | isync | |
392 | 10: | |
393 | #elif defined(CONFIG_FSL_BOOKE) | |
394 | rlwinm r4, r3, 0, 0, 19 | |
395 | ori r5, r4, 0x08 /* TLBSEL = 1 */ | |
396 | ori r6, r4, 0x10 /* TLBSEL = 2 */ | |
397 | ori r7, r4, 0x18 /* TLBSEL = 3 */ | |
398 | tlbivax 0, r4 | |
399 | tlbivax 0, r5 | |
400 | tlbivax 0, r6 | |
401 | tlbivax 0, r7 | |
402 | msync | |
403 | #if defined(CONFIG_SMP) | |
404 | tlbsync | |
405 | #endif /* CONFIG_SMP */ | |
406 | #else /* !(CONFIG_40x || CONFIG_44x || CONFIG_FSL_BOOKE) */ | |
407 | #if defined(CONFIG_SMP) | |
408 | rlwinm r8,r1,0,0,18 | |
409 | lwz r8,TI_CPU(r8) | |
410 | oris r8,r8,11 | |
411 | mfmsr r10 | |
412 | SYNC | |
413 | rlwinm r0,r10,0,17,15 /* clear bit 16 (MSR_EE) */ | |
414 | rlwinm r0,r0,0,28,26 /* clear DR */ | |
415 | mtmsr r0 | |
416 | SYNC_601 | |
417 | isync | |
418 | lis r9,mmu_hash_lock@h | |
419 | ori r9,r9,mmu_hash_lock@l | |
420 | tophys(r9,r9) | |
421 | 10: lwarx r7,0,r9 | |
422 | cmpwi 0,r7,0 | |
423 | bne- 10b | |
424 | stwcx. r8,0,r9 | |
425 | bne- 10b | |
426 | eieio | |
427 | tlbie r3 | |
428 | sync | |
429 | TLBSYNC | |
430 | li r0,0 | |
431 | stw r0,0(r9) /* clear mmu_hash_lock */ | |
432 | mtmsr r10 | |
433 | SYNC_601 | |
434 | isync | |
435 | #else /* CONFIG_SMP */ | |
436 | tlbie r3 | |
437 | sync | |
438 | #endif /* CONFIG_SMP */ | |
439 | #endif /* ! CONFIG_40x */ | |
440 | blr | |
441 | ||
442 | /* | |
443 | * Flush instruction cache. | |
444 | * This is a no-op on the 601. | |
445 | */ | |
446 | _GLOBAL(flush_instruction_cache) | |
447 | #if defined(CONFIG_8xx) | |
448 | isync | |
449 | lis r5, IDC_INVALL@h | |
450 | mtspr SPRN_IC_CST, r5 | |
451 | #elif defined(CONFIG_4xx) | |
452 | #ifdef CONFIG_403GCX | |
453 | li r3, 512 | |
454 | mtctr r3 | |
455 | lis r4, KERNELBASE@h | |
456 | 1: iccci 0, r4 | |
457 | addi r4, r4, 16 | |
458 | bdnz 1b | |
459 | #else | |
460 | lis r3, KERNELBASE@h | |
461 | iccci 0,r3 | |
462 | #endif | |
463 | #elif CONFIG_FSL_BOOKE | |
464 | BEGIN_FTR_SECTION | |
465 | mfspr r3,SPRN_L1CSR0 | |
466 | ori r3,r3,L1CSR0_CFI|L1CSR0_CLFC | |
467 | /* msync; isync recommended here */ | |
468 | mtspr SPRN_L1CSR0,r3 | |
469 | isync | |
470 | blr | |
471 | END_FTR_SECTION_IFCLR(CPU_FTR_SPLIT_ID_CACHE) | |
472 | mfspr r3,SPRN_L1CSR1 | |
473 | ori r3,r3,L1CSR1_ICFI|L1CSR1_ICLFR | |
474 | mtspr SPRN_L1CSR1,r3 | |
475 | #else | |
476 | mfspr r3,SPRN_PVR | |
477 | rlwinm r3,r3,16,16,31 | |
478 | cmpwi 0,r3,1 | |
479 | beqlr /* for 601, do nothing */ | |
480 | /* 603/604 processor - use invalidate-all bit in HID0 */ | |
481 | mfspr r3,SPRN_HID0 | |
482 | ori r3,r3,HID0_ICFI | |
483 | mtspr SPRN_HID0,r3 | |
484 | #endif /* CONFIG_8xx/4xx */ | |
485 | isync | |
486 | blr | |
487 | ||
488 | /* | |
489 | * Write any modified data cache blocks out to memory | |
490 | * and invalidate the corresponding instruction cache blocks. | |
491 | * This is a no-op on the 601. | |
492 | * | |
493 | * flush_icache_range(unsigned long start, unsigned long stop) | |
494 | */ | |
495 | _GLOBAL(flush_icache_range) | |
496 | BEGIN_FTR_SECTION | |
497 | blr /* for 601, do nothing */ | |
498 | END_FTR_SECTION_IFCLR(CPU_FTR_SPLIT_ID_CACHE) | |
7dffb720 | 499 | li r5,L1_CACHE_BYTES-1 |
9994a338 PM |
500 | andc r3,r3,r5 |
501 | subf r4,r3,r4 | |
502 | add r4,r4,r5 | |
7dffb720 | 503 | srwi. r4,r4,L1_CACHE_SHIFT |
9994a338 PM |
504 | beqlr |
505 | mtctr r4 | |
506 | mr r6,r3 | |
507 | 1: dcbst 0,r3 | |
7dffb720 | 508 | addi r3,r3,L1_CACHE_BYTES |
9994a338 PM |
509 | bdnz 1b |
510 | sync /* wait for dcbst's to get to ram */ | |
511 | mtctr r4 | |
512 | 2: icbi 0,r6 | |
7dffb720 | 513 | addi r6,r6,L1_CACHE_BYTES |
9994a338 PM |
514 | bdnz 2b |
515 | sync /* additional sync needed on g4 */ | |
516 | isync | |
517 | blr | |
518 | /* | |
519 | * Write any modified data cache blocks out to memory. | |
520 | * Does not invalidate the corresponding cache lines (especially for | |
521 | * any corresponding instruction cache). | |
522 | * | |
523 | * clean_dcache_range(unsigned long start, unsigned long stop) | |
524 | */ | |
525 | _GLOBAL(clean_dcache_range) | |
7dffb720 | 526 | li r5,L1_CACHE_BYTES-1 |
9994a338 PM |
527 | andc r3,r3,r5 |
528 | subf r4,r3,r4 | |
529 | add r4,r4,r5 | |
7dffb720 | 530 | srwi. r4,r4,L1_CACHE_SHIFT |
9994a338 PM |
531 | beqlr |
532 | mtctr r4 | |
533 | ||
534 | 1: dcbst 0,r3 | |
7dffb720 | 535 | addi r3,r3,L1_CACHE_BYTES |
9994a338 PM |
536 | bdnz 1b |
537 | sync /* wait for dcbst's to get to ram */ | |
538 | blr | |
539 | ||
540 | /* | |
541 | * Write any modified data cache blocks out to memory and invalidate them. | |
542 | * Does not invalidate the corresponding instruction cache blocks. | |
543 | * | |
544 | * flush_dcache_range(unsigned long start, unsigned long stop) | |
545 | */ | |
546 | _GLOBAL(flush_dcache_range) | |
7dffb720 | 547 | li r5,L1_CACHE_BYTES-1 |
9994a338 PM |
548 | andc r3,r3,r5 |
549 | subf r4,r3,r4 | |
550 | add r4,r4,r5 | |
7dffb720 | 551 | srwi. r4,r4,L1_CACHE_SHIFT |
9994a338 PM |
552 | beqlr |
553 | mtctr r4 | |
554 | ||
555 | 1: dcbf 0,r3 | |
7dffb720 | 556 | addi r3,r3,L1_CACHE_BYTES |
9994a338 PM |
557 | bdnz 1b |
558 | sync /* wait for dcbst's to get to ram */ | |
559 | blr | |
560 | ||
561 | /* | |
562 | * Like above, but invalidate the D-cache. This is used by the 8xx | |
563 | * to invalidate the cache so the PPC core doesn't get stale data | |
564 | * from the CPM (no cache snooping here :-). | |
565 | * | |
566 | * invalidate_dcache_range(unsigned long start, unsigned long stop) | |
567 | */ | |
568 | _GLOBAL(invalidate_dcache_range) | |
7dffb720 | 569 | li r5,L1_CACHE_BYTES-1 |
9994a338 PM |
570 | andc r3,r3,r5 |
571 | subf r4,r3,r4 | |
572 | add r4,r4,r5 | |
7dffb720 | 573 | srwi. r4,r4,L1_CACHE_SHIFT |
9994a338 PM |
574 | beqlr |
575 | mtctr r4 | |
576 | ||
577 | 1: dcbi 0,r3 | |
7dffb720 | 578 | addi r3,r3,L1_CACHE_BYTES |
9994a338 PM |
579 | bdnz 1b |
580 | sync /* wait for dcbi's to get to ram */ | |
581 | blr | |
582 | ||
583 | #ifdef CONFIG_NOT_COHERENT_CACHE | |
584 | /* | |
585 | * 40x cores have 8K or 16K dcache and 32 byte line size. | |
586 | * 44x has a 32K dcache and 32 byte line size. | |
587 | * 8xx has 1, 2, 4, 8K variants. | |
588 | * For now, cover the worst case of the 44x. | |
589 | * Must be called with external interrupts disabled. | |
590 | */ | |
591 | #define CACHE_NWAYS 64 | |
592 | #define CACHE_NLINES 16 | |
593 | ||
594 | _GLOBAL(flush_dcache_all) | |
595 | li r4, (2 * CACHE_NWAYS * CACHE_NLINES) | |
596 | mtctr r4 | |
597 | lis r5, KERNELBASE@h | |
598 | 1: lwz r3, 0(r5) /* Load one word from every line */ | |
7dffb720 | 599 | addi r5, r5, L1_CACHE_BYTES |
9994a338 PM |
600 | bdnz 1b |
601 | blr | |
602 | #endif /* CONFIG_NOT_COHERENT_CACHE */ | |
603 | ||
604 | /* | |
605 | * Flush a particular page from the data cache to RAM. | |
606 | * Note: this is necessary because the instruction cache does *not* | |
607 | * snoop from the data cache. | |
608 | * This is a no-op on the 601 which has a unified cache. | |
609 | * | |
610 | * void __flush_dcache_icache(void *page) | |
611 | */ | |
612 | _GLOBAL(__flush_dcache_icache) | |
613 | BEGIN_FTR_SECTION | |
614 | blr /* for 601, do nothing */ | |
615 | END_FTR_SECTION_IFCLR(CPU_FTR_SPLIT_ID_CACHE) | |
616 | rlwinm r3,r3,0,0,19 /* Get page base address */ | |
7dffb720 | 617 | li r4,4096/L1_CACHE_BYTES /* Number of lines in a page */ |
9994a338 PM |
618 | mtctr r4 |
619 | mr r6,r3 | |
620 | 0: dcbst 0,r3 /* Write line to ram */ | |
7dffb720 | 621 | addi r3,r3,L1_CACHE_BYTES |
9994a338 PM |
622 | bdnz 0b |
623 | sync | |
624 | mtctr r4 | |
625 | 1: icbi 0,r6 | |
7dffb720 | 626 | addi r6,r6,L1_CACHE_BYTES |
9994a338 PM |
627 | bdnz 1b |
628 | sync | |
629 | isync | |
630 | blr | |
631 | ||
632 | /* | |
633 | * Flush a particular page from the data cache to RAM, identified | |
634 | * by its physical address. We turn off the MMU so we can just use | |
635 | * the physical address (this may be a highmem page without a kernel | |
636 | * mapping). | |
637 | * | |
638 | * void __flush_dcache_icache_phys(unsigned long physaddr) | |
639 | */ | |
640 | _GLOBAL(__flush_dcache_icache_phys) | |
641 | BEGIN_FTR_SECTION | |
642 | blr /* for 601, do nothing */ | |
643 | END_FTR_SECTION_IFCLR(CPU_FTR_SPLIT_ID_CACHE) | |
644 | mfmsr r10 | |
645 | rlwinm r0,r10,0,28,26 /* clear DR */ | |
646 | mtmsr r0 | |
647 | isync | |
648 | rlwinm r3,r3,0,0,19 /* Get page base address */ | |
7dffb720 | 649 | li r4,4096/L1_CACHE_BYTES /* Number of lines in a page */ |
9994a338 PM |
650 | mtctr r4 |
651 | mr r6,r3 | |
652 | 0: dcbst 0,r3 /* Write line to ram */ | |
7dffb720 | 653 | addi r3,r3,L1_CACHE_BYTES |
9994a338 PM |
654 | bdnz 0b |
655 | sync | |
656 | mtctr r4 | |
657 | 1: icbi 0,r6 | |
7dffb720 | 658 | addi r6,r6,L1_CACHE_BYTES |
9994a338 PM |
659 | bdnz 1b |
660 | sync | |
661 | mtmsr r10 /* restore DR */ | |
662 | isync | |
663 | blr | |
664 | ||
665 | /* | |
666 | * Clear pages using the dcbz instruction, which doesn't cause any | |
667 | * memory traffic (except to write out any cache lines which get | |
668 | * displaced). This only works on cacheable memory. | |
669 | * | |
670 | * void clear_pages(void *page, int order) ; | |
671 | */ | |
672 | _GLOBAL(clear_pages) | |
7dffb720 | 673 | li r0,4096/L1_CACHE_BYTES |
9994a338 PM |
674 | slw r0,r0,r4 |
675 | mtctr r0 | |
676 | #ifdef CONFIG_8xx | |
677 | li r4, 0 | |
678 | 1: stw r4, 0(r3) | |
679 | stw r4, 4(r3) | |
680 | stw r4, 8(r3) | |
681 | stw r4, 12(r3) | |
682 | #else | |
683 | 1: dcbz 0,r3 | |
684 | #endif | |
7dffb720 | 685 | addi r3,r3,L1_CACHE_BYTES |
9994a338 PM |
686 | bdnz 1b |
687 | blr | |
688 | ||
689 | /* | |
690 | * Copy a whole page. We use the dcbz instruction on the destination | |
691 | * to reduce memory traffic (it eliminates the unnecessary reads of | |
692 | * the destination into cache). This requires that the destination | |
693 | * is cacheable. | |
694 | */ | |
695 | #define COPY_16_BYTES \ | |
696 | lwz r6,4(r4); \ | |
697 | lwz r7,8(r4); \ | |
698 | lwz r8,12(r4); \ | |
699 | lwzu r9,16(r4); \ | |
700 | stw r6,4(r3); \ | |
701 | stw r7,8(r3); \ | |
702 | stw r8,12(r3); \ | |
703 | stwu r9,16(r3) | |
704 | ||
705 | _GLOBAL(copy_page) | |
706 | addi r3,r3,-4 | |
707 | addi r4,r4,-4 | |
708 | ||
709 | #ifdef CONFIG_8xx | |
710 | /* don't use prefetch on 8xx */ | |
7dffb720 | 711 | li r0,4096/L1_CACHE_BYTES |
9994a338 PM |
712 | mtctr r0 |
713 | 1: COPY_16_BYTES | |
714 | bdnz 1b | |
715 | blr | |
716 | ||
717 | #else /* not 8xx, we can prefetch */ | |
718 | li r5,4 | |
719 | ||
720 | #if MAX_COPY_PREFETCH > 1 | |
721 | li r0,MAX_COPY_PREFETCH | |
722 | li r11,4 | |
723 | mtctr r0 | |
724 | 11: dcbt r11,r4 | |
7dffb720 | 725 | addi r11,r11,L1_CACHE_BYTES |
9994a338 PM |
726 | bdnz 11b |
727 | #else /* MAX_COPY_PREFETCH == 1 */ | |
728 | dcbt r5,r4 | |
7dffb720 | 729 | li r11,L1_CACHE_BYTES+4 |
9994a338 | 730 | #endif /* MAX_COPY_PREFETCH */ |
7dffb720 | 731 | li r0,4096/L1_CACHE_BYTES - MAX_COPY_PREFETCH |
9994a338 PM |
732 | crclr 4*cr0+eq |
733 | 2: | |
734 | mtctr r0 | |
735 | 1: | |
736 | dcbt r11,r4 | |
737 | dcbz r5,r3 | |
738 | COPY_16_BYTES | |
7dffb720 | 739 | #if L1_CACHE_BYTES >= 32 |
9994a338 | 740 | COPY_16_BYTES |
7dffb720 | 741 | #if L1_CACHE_BYTES >= 64 |
9994a338 PM |
742 | COPY_16_BYTES |
743 | COPY_16_BYTES | |
7dffb720 | 744 | #if L1_CACHE_BYTES >= 128 |
9994a338 PM |
745 | COPY_16_BYTES |
746 | COPY_16_BYTES | |
747 | COPY_16_BYTES | |
748 | COPY_16_BYTES | |
749 | #endif | |
750 | #endif | |
751 | #endif | |
752 | bdnz 1b | |
753 | beqlr | |
754 | crnot 4*cr0+eq,4*cr0+eq | |
755 | li r0,MAX_COPY_PREFETCH | |
756 | li r11,4 | |
757 | b 2b | |
758 | #endif /* CONFIG_8xx */ | |
759 | ||
760 | /* | |
761 | * void atomic_clear_mask(atomic_t mask, atomic_t *addr) | |
762 | * void atomic_set_mask(atomic_t mask, atomic_t *addr); | |
763 | */ | |
764 | _GLOBAL(atomic_clear_mask) | |
765 | 10: lwarx r5,0,r4 | |
766 | andc r5,r5,r3 | |
767 | PPC405_ERR77(0,r4) | |
768 | stwcx. r5,0,r4 | |
769 | bne- 10b | |
770 | blr | |
771 | _GLOBAL(atomic_set_mask) | |
772 | 10: lwarx r5,0,r4 | |
773 | or r5,r5,r3 | |
774 | PPC405_ERR77(0,r4) | |
775 | stwcx. r5,0,r4 | |
776 | bne- 10b | |
777 | blr | |
778 | ||
779 | /* | |
780 | * I/O string operations | |
781 | * | |
782 | * insb(port, buf, len) | |
783 | * outsb(port, buf, len) | |
784 | * insw(port, buf, len) | |
785 | * outsw(port, buf, len) | |
786 | * insl(port, buf, len) | |
787 | * outsl(port, buf, len) | |
788 | * insw_ns(port, buf, len) | |
789 | * outsw_ns(port, buf, len) | |
790 | * insl_ns(port, buf, len) | |
791 | * outsl_ns(port, buf, len) | |
792 | * | |
793 | * The *_ns versions don't do byte-swapping. | |
794 | */ | |
795 | _GLOBAL(_insb) | |
796 | cmpwi 0,r5,0 | |
797 | mtctr r5 | |
798 | subi r4,r4,1 | |
799 | blelr- | |
800 | 00: lbz r5,0(r3) | |
801 | eieio | |
802 | stbu r5,1(r4) | |
803 | bdnz 00b | |
804 | blr | |
805 | ||
806 | _GLOBAL(_outsb) | |
807 | cmpwi 0,r5,0 | |
808 | mtctr r5 | |
809 | subi r4,r4,1 | |
810 | blelr- | |
811 | 00: lbzu r5,1(r4) | |
812 | stb r5,0(r3) | |
813 | eieio | |
814 | bdnz 00b | |
815 | blr | |
816 | ||
817 | _GLOBAL(_insw) | |
818 | cmpwi 0,r5,0 | |
819 | mtctr r5 | |
820 | subi r4,r4,2 | |
821 | blelr- | |
822 | 00: lhbrx r5,0,r3 | |
823 | eieio | |
824 | sthu r5,2(r4) | |
825 | bdnz 00b | |
826 | blr | |
827 | ||
828 | _GLOBAL(_outsw) | |
829 | cmpwi 0,r5,0 | |
830 | mtctr r5 | |
831 | subi r4,r4,2 | |
832 | blelr- | |
833 | 00: lhzu r5,2(r4) | |
834 | eieio | |
835 | sthbrx r5,0,r3 | |
836 | bdnz 00b | |
837 | blr | |
838 | ||
839 | _GLOBAL(_insl) | |
840 | cmpwi 0,r5,0 | |
841 | mtctr r5 | |
842 | subi r4,r4,4 | |
843 | blelr- | |
844 | 00: lwbrx r5,0,r3 | |
845 | eieio | |
846 | stwu r5,4(r4) | |
847 | bdnz 00b | |
848 | blr | |
849 | ||
850 | _GLOBAL(_outsl) | |
851 | cmpwi 0,r5,0 | |
852 | mtctr r5 | |
853 | subi r4,r4,4 | |
854 | blelr- | |
855 | 00: lwzu r5,4(r4) | |
856 | stwbrx r5,0,r3 | |
857 | eieio | |
858 | bdnz 00b | |
859 | blr | |
860 | ||
861 | _GLOBAL(__ide_mm_insw) | |
862 | _GLOBAL(_insw_ns) | |
863 | cmpwi 0,r5,0 | |
864 | mtctr r5 | |
865 | subi r4,r4,2 | |
866 | blelr- | |
867 | 00: lhz r5,0(r3) | |
868 | eieio | |
869 | sthu r5,2(r4) | |
870 | bdnz 00b | |
871 | blr | |
872 | ||
873 | _GLOBAL(__ide_mm_outsw) | |
874 | _GLOBAL(_outsw_ns) | |
875 | cmpwi 0,r5,0 | |
876 | mtctr r5 | |
877 | subi r4,r4,2 | |
878 | blelr- | |
879 | 00: lhzu r5,2(r4) | |
880 | sth r5,0(r3) | |
881 | eieio | |
882 | bdnz 00b | |
883 | blr | |
884 | ||
885 | _GLOBAL(__ide_mm_insl) | |
886 | _GLOBAL(_insl_ns) | |
887 | cmpwi 0,r5,0 | |
888 | mtctr r5 | |
889 | subi r4,r4,4 | |
890 | blelr- | |
891 | 00: lwz r5,0(r3) | |
892 | eieio | |
893 | stwu r5,4(r4) | |
894 | bdnz 00b | |
895 | blr | |
896 | ||
897 | _GLOBAL(__ide_mm_outsl) | |
898 | _GLOBAL(_outsl_ns) | |
899 | cmpwi 0,r5,0 | |
900 | mtctr r5 | |
901 | subi r4,r4,4 | |
902 | blelr- | |
903 | 00: lwzu r5,4(r4) | |
904 | stw r5,0(r3) | |
905 | eieio | |
906 | bdnz 00b | |
907 | blr | |
908 | ||
909 | /* | |
910 | * Extended precision shifts. | |
911 | * | |
912 | * Updated to be valid for shift counts from 0 to 63 inclusive. | |
913 | * -- Gabriel | |
914 | * | |
915 | * R3/R4 has 64 bit value | |
916 | * R5 has shift count | |
917 | * result in R3/R4 | |
918 | * | |
919 | * ashrdi3: arithmetic right shift (sign propagation) | |
920 | * lshrdi3: logical right shift | |
921 | * ashldi3: left shift | |
922 | */ | |
923 | _GLOBAL(__ashrdi3) | |
924 | subfic r6,r5,32 | |
925 | srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count | |
926 | addi r7,r5,32 # could be xori, or addi with -32 | |
927 | slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count) | |
928 | rlwinm r8,r7,0,32 # t3 = (count < 32) ? 32 : 0 | |
929 | sraw r7,r3,r7 # t2 = MSW >> (count-32) | |
930 | or r4,r4,r6 # LSW |= t1 | |
931 | slw r7,r7,r8 # t2 = (count < 32) ? 0 : t2 | |
932 | sraw r3,r3,r5 # MSW = MSW >> count | |
933 | or r4,r4,r7 # LSW |= t2 | |
934 | blr | |
935 | ||
936 | _GLOBAL(__ashldi3) | |
937 | subfic r6,r5,32 | |
938 | slw r3,r3,r5 # MSW = count > 31 ? 0 : MSW << count | |
939 | addi r7,r5,32 # could be xori, or addi with -32 | |
940 | srw r6,r4,r6 # t1 = count > 31 ? 0 : LSW >> (32-count) | |
941 | slw r7,r4,r7 # t2 = count < 32 ? 0 : LSW << (count-32) | |
942 | or r3,r3,r6 # MSW |= t1 | |
943 | slw r4,r4,r5 # LSW = LSW << count | |
944 | or r3,r3,r7 # MSW |= t2 | |
945 | blr | |
946 | ||
947 | _GLOBAL(__lshrdi3) | |
948 | subfic r6,r5,32 | |
949 | srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count | |
950 | addi r7,r5,32 # could be xori, or addi with -32 | |
951 | slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count) | |
952 | srw r7,r3,r7 # t2 = count < 32 ? 0 : MSW >> (count-32) | |
953 | or r4,r4,r6 # LSW |= t1 | |
954 | srw r3,r3,r5 # MSW = MSW >> count | |
955 | or r4,r4,r7 # LSW |= t2 | |
956 | blr | |
957 | ||
958 | _GLOBAL(abs) | |
959 | srawi r4,r3,31 | |
960 | xor r3,r3,r4 | |
961 | sub r3,r3,r4 | |
962 | blr | |
963 | ||
964 | _GLOBAL(_get_SP) | |
965 | mr r3,r1 /* Close enough */ | |
966 | blr | |
967 | ||
968 | /* | |
969 | * These are used in the alignment trap handler when emulating | |
970 | * single-precision loads and stores. | |
971 | * We restore and save the fpscr so the task gets the same result | |
972 | * and exceptions as if the cpu had performed the load or store. | |
973 | */ | |
974 | ||
975 | #ifdef CONFIG_PPC_FPU | |
976 | _GLOBAL(cvt_fd) | |
977 | lfd 0,-4(r5) /* load up fpscr value */ | |
978 | mtfsf 0xff,0 | |
979 | lfs 0,0(r3) | |
980 | stfd 0,0(r4) | |
981 | mffs 0 /* save new fpscr value */ | |
982 | stfd 0,-4(r5) | |
983 | blr | |
984 | ||
985 | _GLOBAL(cvt_df) | |
986 | lfd 0,-4(r5) /* load up fpscr value */ | |
987 | mtfsf 0xff,0 | |
988 | lfd 0,0(r3) | |
989 | stfs 0,0(r4) | |
990 | mffs 0 /* save new fpscr value */ | |
991 | stfd 0,-4(r5) | |
992 | blr | |
993 | #endif | |
994 | ||
995 | /* | |
996 | * Create a kernel thread | |
997 | * kernel_thread(fn, arg, flags) | |
998 | */ | |
999 | _GLOBAL(kernel_thread) | |
1000 | stwu r1,-16(r1) | |
1001 | stw r30,8(r1) | |
1002 | stw r31,12(r1) | |
1003 | mr r30,r3 /* function */ | |
1004 | mr r31,r4 /* argument */ | |
1005 | ori r3,r5,CLONE_VM /* flags */ | |
1006 | oris r3,r3,CLONE_UNTRACED>>16 | |
1007 | li r4,0 /* new sp (unused) */ | |
1008 | li r0,__NR_clone | |
1009 | sc | |
1010 | cmpwi 0,r3,0 /* parent or child? */ | |
1011 | bne 1f /* return if parent */ | |
1012 | li r0,0 /* make top-level stack frame */ | |
1013 | stwu r0,-16(r1) | |
1014 | mtlr r30 /* fn addr in lr */ | |
1015 | mr r3,r31 /* load arg and call fn */ | |
1016 | PPC440EP_ERR42 | |
1017 | blrl | |
1018 | li r0,__NR_exit /* exit if function returns */ | |
1019 | li r3,0 | |
1020 | sc | |
1021 | 1: lwz r30,8(r1) | |
1022 | lwz r31,12(r1) | |
1023 | addi r1,r1,16 | |
1024 | blr | |
1025 | ||
1026 | _GLOBAL(execve) | |
1027 | li r0,__NR_execve | |
1028 | sc | |
1029 | bnslr | |
1030 | neg r3,r3 | |
1031 | blr | |
1032 | ||
1033 | /* | |
1034 | * This routine is just here to keep GCC happy - sigh... | |
1035 | */ | |
1036 | _GLOBAL(__main) | |
1037 | blr |