1 /* SPDX-License-Identifier: GPL-2.0-or-later * <<
2 /* 1 /*
3 * OpenRISC head.S !! 2 * alpha/boot/head.S
4 * 3 *
5 * Linux architectural port borrowing liberall !! 4 * initial boot stuff.. At this point, the bootloader has already
6 * others. All original copyrights apply as p !! 5 * switched into OSF/1 PAL-code, and loaded us at the correct address
7 * declaration. !! 6 * (START_ADDR). So there isn't much left for us to do: just set up
8 * !! 7 * the kernel global pointer and jump to the kernel entry-point.
9 * Modifications for the OpenRISC architecture !! 8 */
10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@ !! 9
11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@so !! 10 #include <linux/config.h>
12 */ !! 11 #include <asm/system.h>
13 !! 12 #include <asm/asm_offsets.h>
14 #include <linux/linkage.h> !! 13
15 #include <linux/threads.h> !! 14 .globl swapper_pg_dir
16 #include <linux/errno.h> !! 15 .globl _stext
17 #include <linux/init.h> !! 16 swapper_pg_dir=SWAPPER_PGD
18 #include <linux/serial_reg.h> !! 17
19 #include <linux/pgtable.h> !! 18 .set noreorder
20 #include <asm/processor.h> !! 19 .globl __start
21 #include <asm/page.h> !! 20 .ent __start
22 #include <asm/mmu.h> !! 21 _stext:
23 #include <asm/thread_info.h> !! 22 __start:
24 #include <asm/cache.h> !! 23 .prologue 0
25 #include <asm/spr_defs.h> !! 24 br $27,1f
26 #include <asm/asm-offsets.h> !! 25 1: ldgp $29,0($27)
27 #include <linux/of_fdt.h> !! 26 /* We need to get current_task_info loaded up... */
28 !! 27 lda $8,init_thread_union
29 #define tophys(rd,rs) !! 28 /* ... and find our stack ... */
30 l.movhi rd,hi(-KERNELBASE) !! 29 lda $30,0x4000 - SIZEOF_PT_REGS($8)
31 l.add rd,rd,rs !! 30 /* ... and then we can start the kernel. */
32 !! 31 jsr $26,start_kernel
33 #define CLEAR_GPR(gpr) !! 32 call_pal PAL_halt
34 l.movhi gpr,0x0 !! 33 .end __start
35 <<
36 #define LOAD_SYMBOL_2_GPR(gpr,symbol) <<
37 l.movhi gpr,hi(symbol) <<
38 l.ori gpr,gpr,lo(symbol) <<
39 <<
40 <<
41 #define UART_BASE_ADD 0x90000000 <<
42 <<
43 #define EXCEPTION_SR (SPR_SR_DME | SPR_SR_IME <<
44 #define SYSCALL_SR (SPR_SR_DME | SPR_SR_IME | <<
45 <<
46 /* =========================================== <<
47 <<
48 #define SPR_SHADOW_GPR(x) ((x) + SPR_GPR <<
49 <<
50 /* <<
51 * emergency_print temporary stores <<
52 */ <<
53 #ifdef CONFIG_OPENRISC_HAVE_SHADOW_GPRS <<
54 #define EMERGENCY_PRINT_STORE_GPR4 l.mtsp <<
55 #define EMERGENCY_PRINT_LOAD_GPR4 l.mfsp <<
56 <<
57 #define EMERGENCY_PRINT_STORE_GPR5 l.mtsp <<
58 #define EMERGENCY_PRINT_LOAD_GPR5 l.mfsp <<
59 <<
60 #define EMERGENCY_PRINT_STORE_GPR6 l.mtsp <<
61 #define EMERGENCY_PRINT_LOAD_GPR6 l.mfsp <<
62 <<
63 #define EMERGENCY_PRINT_STORE_GPR7 l.mtsp <<
64 #define EMERGENCY_PRINT_LOAD_GPR7 l.mfsp <<
65 <<
66 #define EMERGENCY_PRINT_STORE_GPR8 l.mtsp <<
67 #define EMERGENCY_PRINT_LOAD_GPR8 l.mfsp <<
68 <<
69 #define EMERGENCY_PRINT_STORE_GPR9 l.mtsp <<
70 #define EMERGENCY_PRINT_LOAD_GPR9 l.mfsp <<
71 <<
72 #else /* !CONFIG_OPENRISC_HAVE_SHADOW_GPRS */ <<
73 #define EMERGENCY_PRINT_STORE_GPR4 l.sw <<
74 #define EMERGENCY_PRINT_LOAD_GPR4 l.lwz <<
75 <<
76 #define EMERGENCY_PRINT_STORE_GPR5 l.sw <<
77 #define EMERGENCY_PRINT_LOAD_GPR5 l.lwz <<
78 <<
79 #define EMERGENCY_PRINT_STORE_GPR6 l.sw <<
80 #define EMERGENCY_PRINT_LOAD_GPR6 l.lwz <<
81 <<
82 #define EMERGENCY_PRINT_STORE_GPR7 l.sw <<
83 #define EMERGENCY_PRINT_LOAD_GPR7 l.lwz <<
84 <<
85 #define EMERGENCY_PRINT_STORE_GPR8 l.sw <<
86 #define EMERGENCY_PRINT_LOAD_GPR8 l.lwz <<
87 <<
88 #define EMERGENCY_PRINT_STORE_GPR9 l.sw <<
89 #define EMERGENCY_PRINT_LOAD_GPR9 l.lwz <<
90 <<
91 #endif <<
92 <<
93 /* <<
94 * TLB miss handlers temorary stores <<
95 */ <<
96 #ifdef CONFIG_OPENRISC_HAVE_SHADOW_GPRS <<
97 #define EXCEPTION_STORE_GPR2 l.mtsp <<
98 #define EXCEPTION_LOAD_GPR2 l.mfsp <<
99 <<
100 #define EXCEPTION_STORE_GPR3 l.mtsp <<
101 #define EXCEPTION_LOAD_GPR3 l.mfsp <<
102 <<
103 #define EXCEPTION_STORE_GPR4 l.mtsp <<
104 #define EXCEPTION_LOAD_GPR4 l.mfsp <<
105 <<
106 #define EXCEPTION_STORE_GPR5 l.mtsp <<
107 #define EXCEPTION_LOAD_GPR5 l.mfsp <<
108 <<
109 #define EXCEPTION_STORE_GPR6 l.mtsp <<
110 #define EXCEPTION_LOAD_GPR6 l.mfsp <<
111 <<
112 #else /* !CONFIG_OPENRISC_HAVE_SHADOW_GPRS */ <<
113 #define EXCEPTION_STORE_GPR2 l.sw <<
114 #define EXCEPTION_LOAD_GPR2 l.lwz <<
115 <<
116 #define EXCEPTION_STORE_GPR3 l.sw <<
117 #define EXCEPTION_LOAD_GPR3 l.lwz <<
118 <<
119 #define EXCEPTION_STORE_GPR4 l.sw <<
120 #define EXCEPTION_LOAD_GPR4 l.lwz <<
121 <<
122 #define EXCEPTION_STORE_GPR5 l.sw <<
123 #define EXCEPTION_LOAD_GPR5 l.lwz <<
124 <<
125 #define EXCEPTION_STORE_GPR6 l.sw <<
126 #define EXCEPTION_LOAD_GPR6 l.lwz <<
127 <<
128 #endif <<
129 <<
130 /* <<
131 * EXCEPTION_HANDLE temporary stores <<
132 */ <<
133 <<
134 #ifdef CONFIG_OPENRISC_HAVE_SHADOW_GPRS <<
135 #define EXCEPTION_T_STORE_GPR30 l.mtsp <<
136 #define EXCEPTION_T_LOAD_GPR30(reg) l.mfsp <<
137 <<
138 #define EXCEPTION_T_STORE_GPR10 l.mtsp <<
139 #define EXCEPTION_T_LOAD_GPR10(reg) l.mfsp <<
140 <<
141 #define EXCEPTION_T_STORE_SP l.mtsp <<
142 #define EXCEPTION_T_LOAD_SP(reg) l.mfsp <<
143 <<
144 #else /* !CONFIG_OPENRISC_HAVE_SHADOW_GPRS */ <<
145 #define EXCEPTION_T_STORE_GPR30 l.sw <<
146 #define EXCEPTION_T_LOAD_GPR30(reg) l.lwz <<
147 <<
148 #define EXCEPTION_T_STORE_GPR10 l.sw <<
149 #define EXCEPTION_T_LOAD_GPR10(reg) l.lwz <<
150 <<
151 #define EXCEPTION_T_STORE_SP l.sw <<
152 #define EXCEPTION_T_LOAD_SP(reg) l.lwz <<
153 #endif <<
154 <<
155 /* =========================================== <<
156 <<
157 #ifdef CONFIG_SMP <<
158 #define GET_CURRENT_PGD(reg,t1) <<
159 LOAD_SYMBOL_2_GPR(reg,current_pgd) <<
160 l.mfspr t1,r0,SPR_COREID <<
161 l.slli t1,t1,2 <<
162 l.add reg,reg,t1 <<
163 tophys (t1,reg) <<
164 l.lwz reg,0(t1) <<
165 #else <<
166 #define GET_CURRENT_PGD(reg,t1) <<
167 LOAD_SYMBOL_2_GPR(reg,current_pgd) <<
168 tophys (t1,reg) <<
169 l.lwz reg,0(t1) <<
170 #endif <<
171 <<
172 /* Load r10 from current_thread_info_set - clo <<
173 #ifdef CONFIG_SMP <<
174 #define GET_CURRENT_THREAD_INFO <<
175 LOAD_SYMBOL_2_GPR(r1,current_thread_in <<
176 tophys (r30,r1) <<
177 l.mfspr r10,r0,SPR_COREID <<
178 l.slli r10,r10,2 <<
179 l.add r30,r30,r10 <<
180 /* r10: current_thread_info */ <<
181 l.lwz r10,0(r30) <<
182 #else <<
183 #define GET_CURRENT_THREAD_INFO <<
184 LOAD_SYMBOL_2_GPR(r1,current_thread_in <<
185 tophys (r30,r1) <<
186 /* r10: current_thread_info */ <<
187 l.lwz r10,0(r30) <<
188 #endif <<
189 <<
190 /* <<
191 * DSCR: this is a common hook for handling ex <<
192 * the needed registers, set up stack an <<
193 * then jump to the handler while enabli <<
194 * <<
195 * PRMS: handler - a function to jump t <<
196 * remaining registers to <<
197 * appropriate arch-indep <<
198 * and finaly jump to ret <<
199 * <<
200 * PREQ: unchanged state from the time excepti <<
201 * <<
202 * POST: SAVED the following registers origina <<
203 * to the new created exception fr <<
204 * <<
205 * r1 - ksp pointing to the new (e <<
206 * r4 - EEAR exception EA <<
207 * r10 - current pointing to current_th <<
208 * r12 - syscall 0, since we didn't com <<
209 * r30 - handler address of the handler <<
210 * <<
211 * handler has to save remaining registe <<
212 * ksp frame *before* tainting them! <<
213 * <<
214 * NOTE: this function is not reentrant per se <<
215 * by processor disabling all exceptions <<
216 * accours. <<
217 * <<
218 * OPTM: no need to make it so wasteful to ext <<
219 */ <<
220 <<
221 #define EXCEPTION_HANDLE(handler) <<
222 EXCEPTION_T_STORE_GPR30 <<
223 l.mfspr r30,r0,SPR_ESR_BASE <<
224 l.andi r30,r30,SPR_SR_SM <<
225 l.sfeqi r30,0 <<
226 EXCEPTION_T_STORE_GPR10 <<
227 l.bnf 2f <<
228 EXCEPTION_T_STORE_SP <<
229 1: /* user_mode: */ <<
230 GET_CURRENT_THREAD_INFO <<
231 tophys (r30,r10) <<
232 l.lwz r1,(TI_KSP)(r30) <<
233 /* fall through */ <<
234 2: /* kernel_mode: */ <<
235 /* create new stack frame, save only n <<
236 /* r1: KSP, r10: current, r4: EEAR, r3 <<
237 /* r12: temp, syscall indicator */ <<
238 l.addi r1,r1,-(INT_FRAME_SIZE) <<
239 /* r1 is KSP, r30 is __pa(KSP) */ <<
240 tophys (r30,r1) <<
241 l.sw PT_GPR12(r30),r12 <<
242 /* r4 use for tmp before EA */ <<
243 l.mfspr r12,r0,SPR_EPCR_BASE <<
244 l.sw PT_PC(r30),r12 <<
245 l.mfspr r12,r0,SPR_ESR_BASE <<
246 l.sw PT_SR(r30),r12 <<
247 /* save r30 */ <<
248 EXCEPTION_T_LOAD_GPR30(r12) <<
249 l.sw PT_GPR30(r30),r12 <<
250 /* save r10 as was prior to exception <<
251 EXCEPTION_T_LOAD_GPR10(r12) <<
252 l.sw PT_GPR10(r30),r12 <<
253 /* save PT_SP as was prior to exceptio <<
254 EXCEPTION_T_LOAD_SP(r12) <<
255 l.sw PT_SP(r30),r12 <<
256 /* save exception r4, set r4 = EA */ <<
257 l.sw PT_GPR4(r30),r4 <<
258 l.mfspr r4,r0,SPR_EEAR_BASE <<
259 /* r12 == 1 if we come from syscall */ <<
260 CLEAR_GPR(r12) <<
261 /* ----- turn on MMU ----- */ <<
262 /* Carry DSX into exception SR */ <<
263 l.mfspr r30,r0,SPR_SR <<
264 l.andi r30,r30,SPR_SR_DSX <<
265 l.ori r30,r30,(EXCEPTION_SR) <<
266 l.mtspr r0,r30,SPR_ESR_BASE <<
267 /* r30: EA address of handler */ <<
268 LOAD_SYMBOL_2_GPR(r30,handler) <<
269 l.mtspr r0,r30,SPR_EPCR_BASE <<
270 l.rfe <<
271 <<
272 /* <<
273 * this doesn't work <<
274 * <<
275 * <<
276 * #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION <<
277 * #define UNHANDLED_EXCEPTION(handler) <<
278 * l.ori r3,r0,0x1 <<
279 * l.mtspr r0,r3,SPR_SR <<
280 * l.movhi r3,hi(0xf0000100) <<
281 * l.ori r3,r3,lo(0xf0000100) <<
282 * l.jr r3 <<
283 * l.nop 1 <<
284 * <<
285 * #endif <<
286 */ <<
287 <<
288 /* DSCR: this is the same as EXCEPTION_HANDLE( <<
289 * a bit more carefull (if we have a PT_ <<
290 * corruption) and set them up from 'cur <<
291 * <<
292 */ <<
293 #define UNHANDLED_EXCEPTION(handler) <<
294 EXCEPTION_T_STORE_GPR30 <<
295 EXCEPTION_T_STORE_GPR10 <<
296 EXCEPTION_T_STORE_SP <<
297 /* temporary store r3, r9 into r1, r10 <<
298 l.addi r1,r3,0x0 <<
299 l.addi r10,r9,0x0 <<
300 LOAD_SYMBOL_2_GPR(r9,_string_unhandled <<
301 tophys (r3,r9) <<
302 l.jal _emergency_print <<
303 l.nop <<
304 l.mfspr r3,r0,SPR_NPC <<
305 l.jal _emergency_print_nr <<
306 l.andi r3,r3,0x1f00 <<
307 LOAD_SYMBOL_2_GPR(r9,_string_epc_prefi <<
308 tophys (r3,r9) <<
309 l.jal _emergency_print <<
310 l.nop <<
311 l.jal _emergency_print_nr <<
312 l.mfspr r3,r0,SPR_EPCR_BASE <<
313 LOAD_SYMBOL_2_GPR(r9,_string_nl) <<
314 tophys (r3,r9) <<
315 l.jal _emergency_print <<
316 l.nop <<
317 /* end of printing */ <<
318 l.addi r3,r1,0x0 <<
319 l.addi r9,r10,0x0 <<
320 /* extract current, ksp from current_s <<
321 LOAD_SYMBOL_2_GPR(r1,_unhandled_stack_ <<
322 LOAD_SYMBOL_2_GPR(r10,init_thread_unio <<
323 /* create new stack frame, save only n <<
324 /* r1: KSP, r10: current, r31: __pa(KS <<
325 /* r12: temp, syscall indicator, r13 t <<
326 l.addi r1,r1,-(INT_FRAME_SIZE) <<
327 /* r1 is KSP, r30 is __pa(KSP) */ <<
328 tophys (r30,r1) <<
329 l.sw PT_GPR12(r30),r12 <<
330 l.mfspr r12,r0,SPR_EPCR_BASE <<
331 l.sw PT_PC(r30),r12 <<
332 l.mfspr r12,r0,SPR_ESR_BASE <<
333 l.sw PT_SR(r30),r12 <<
334 /* save r31 */ <<
335 EXCEPTION_T_LOAD_GPR30(r12) <<
336 l.sw PT_GPR30(r30),r12 <<
337 /* save r10 as was prior to exception <<
338 EXCEPTION_T_LOAD_GPR10(r12) <<
339 l.sw PT_GPR10(r30),r12 <<
340 /* save PT_SP as was prior to exceptio <<
341 EXCEPTION_T_LOAD_SP(r12) <<
342 l.sw PT_SP(r30),r12 <<
343 l.sw PT_GPR13(r30),r13 <<
344 /* --> */ <<
345 /* save exception r4, set r4 = EA */ <<
346 l.sw PT_GPR4(r30),r4 <<
347 l.mfspr r4,r0,SPR_EEAR_BASE <<
348 /* r12 == 1 if we come from syscall */ <<
349 CLEAR_GPR(r12) <<
350 /* ----- play a MMU trick ----- */ <<
351 l.ori r30,r0,(EXCEPTION_SR) <<
352 l.mtspr r0,r30,SPR_ESR_BASE <<
353 /* r31: EA address of handler */ <<
354 LOAD_SYMBOL_2_GPR(r30,handler) <<
355 l.mtspr r0,r30,SPR_EPCR_BASE <<
356 l.rfe <<
357 <<
358 /* =========================================== <<
359 <<
360 /* ---[ 0x100: RESET exception ]-------------- <<
361 .org 0x100 <<
362 /* Jump to .init code at _start which <<
363 * and will be discarded after boot. <<
364 */ <<
365 LOAD_SYMBOL_2_GPR(r15, _start) <<
366 tophys (r13,r15) <<
367 l.jr r13 <<
368 l.nop <<
369 <<
370 /* ---[ 0x200: BUS exception ]---------------- <<
371 .org 0x200 <<
372 _dispatch_bus_fault: <<
373 EXCEPTION_HANDLE(_bus_fault_handler) <<
374 <<
375 /* ---[ 0x300: Data Page Fault exception ]---- <<
376 .org 0x300 <<
377 _dispatch_do_dpage_fault: <<
378 // totaly disable timer interrupt <<
379 // l.mtspr r0,r0,SPR_TTMR <<
380 // DEBUG_TLB_PROBE(0x300) <<
381 // EXCEPTION_DEBUG_VALUE_ER_ENABLED(0x300 <<
382 EXCEPTION_HANDLE(_data_page_fault_hand <<
383 <<
384 /* ---[ 0x400: Insn Page Fault exception ]---- <<
385 .org 0x400 <<
386 _dispatch_do_ipage_fault: <<
387 // totaly disable timer interrupt <<
388 // l.mtspr r0,r0,SPR_TTMR <<
389 // DEBUG_TLB_PROBE(0x400) <<
390 // EXCEPTION_DEBUG_VALUE_ER_ENABLED(0x400 <<
391 EXCEPTION_HANDLE(_insn_page_fault_hand <<
392 <<
393 /* ---[ 0x500: Timer exception ]-------------- <<
394 .org 0x500 <<
395 EXCEPTION_HANDLE(_timer_handler) <<
396 <<
397 /* ---[ 0x600: Alignment exception ]---------- <<
398 .org 0x600 <<
399 EXCEPTION_HANDLE(_alignment_handler) <<
400 <<
401 /* ---[ 0x700: Illegal insn exception ]------- <<
402 .org 0x700 <<
403 EXCEPTION_HANDLE(_illegal_instruction_ <<
404 <<
405 /* ---[ 0x800: External interrupt exception ]- <<
406 .org 0x800 <<
407 EXCEPTION_HANDLE(_external_irq_handler <<
408 <<
409 /* ---[ 0x900: DTLB miss exception ]---------- <<
410 .org 0x900 <<
411 l.j boot_dtlb_miss_handler <<
412 l.nop <<
413 <<
414 /* ---[ 0xa00: ITLB miss exception ]---------- <<
415 .org 0xa00 <<
416 l.j boot_itlb_miss_handler <<
417 l.nop <<
418 <<
419 /* ---[ 0xb00: Range exception ]-------------- <<
420 .org 0xb00 <<
421 UNHANDLED_EXCEPTION(_vector_0xb00) <<
422 <<
423 /* ---[ 0xc00: Syscall exception ]------------ <<
424 .org 0xc00 <<
425 EXCEPTION_HANDLE(_sys_call_handler) <<
426 <<
427 /* ---[ 0xd00: Floating point exception ]----- <<
428 .org 0xd00 <<
429 EXCEPTION_HANDLE(_fpe_trap_handler) <<
430 <<
431 /* ---[ 0xe00: Trap exception ]--------------- <<
432 .org 0xe00 <<
433 // UNHANDLED_EXCEPTION(_vector_0xe00) <<
434 EXCEPTION_HANDLE(_trap_handler) <<
435 <<
436 /* ---[ 0xf00: Reserved exception ]----------- <<
437 .org 0xf00 <<
438 UNHANDLED_EXCEPTION(_vector_0xf00) <<
439 <<
440 /* ---[ 0x1000: Reserved exception ]---------- <<
441 .org 0x1000 <<
442 UNHANDLED_EXCEPTION(_vector_0x1000) <<
443 <<
444 /* ---[ 0x1100: Reserved exception ]---------- <<
445 .org 0x1100 <<
446 UNHANDLED_EXCEPTION(_vector_0x1100) <<
447 <<
448 /* ---[ 0x1200: Reserved exception ]---------- <<
449 .org 0x1200 <<
450 UNHANDLED_EXCEPTION(_vector_0x1200) <<
451 <<
452 /* ---[ 0x1300: Reserved exception ]---------- <<
453 .org 0x1300 <<
454 UNHANDLED_EXCEPTION(_vector_0x1300) <<
455 <<
456 /* ---[ 0x1400: Reserved exception ]---------- <<
457 .org 0x1400 <<
458 UNHANDLED_EXCEPTION(_vector_0x1400) <<
459 <<
460 /* ---[ 0x1500: Reserved exception ]---------- <<
461 .org 0x1500 <<
462 UNHANDLED_EXCEPTION(_vector_0x1500) <<
463 <<
464 /* ---[ 0x1600: Reserved exception ]---------- <<
465 .org 0x1600 <<
466 UNHANDLED_EXCEPTION(_vector_0x1600) <<
467 <<
468 /* ---[ 0x1700: Reserved exception ]---------- <<
469 .org 0x1700 <<
470 UNHANDLED_EXCEPTION(_vector_0x1700) <<
471 <<
472 /* ---[ 0x1800: Reserved exception ]---------- <<
473 .org 0x1800 <<
474 UNHANDLED_EXCEPTION(_vector_0x1800) <<
475 <<
476 /* ---[ 0x1900: Reserved exception ]---------- <<
477 .org 0x1900 <<
478 UNHANDLED_EXCEPTION(_vector_0x1900) <<
479 <<
480 /* ---[ 0x1a00: Reserved exception ]---------- <<
481 .org 0x1a00 <<
482 UNHANDLED_EXCEPTION(_vector_0x1a00) <<
483 <<
484 /* ---[ 0x1b00: Reserved exception ]---------- <<
485 .org 0x1b00 <<
486 UNHANDLED_EXCEPTION(_vector_0x1b00) <<
487 <<
488 /* ---[ 0x1c00: Reserved exception ]---------- <<
489 .org 0x1c00 <<
490 UNHANDLED_EXCEPTION(_vector_0x1c00) <<
491 <<
492 /* ---[ 0x1d00: Reserved exception ]---------- <<
493 .org 0x1d00 <<
494 UNHANDLED_EXCEPTION(_vector_0x1d00) <<
495 <<
496 /* ---[ 0x1e00: Reserved exception ]---------- <<
497 .org 0x1e00 <<
498 UNHANDLED_EXCEPTION(_vector_0x1e00) <<
499 <<
500 /* ---[ 0x1f00: Reserved exception ]---------- <<
501 .org 0x1f00 <<
502 UNHANDLED_EXCEPTION(_vector_0x1f00) <<
503 <<
504 .org 0x2000 <<
505 /* =========================================== <<
506 <<
507 /* .text*/ <<
508 <<
509 /* This early stuff belongs in HEAD, but some <<
510 * don't... */ <<
511 <<
512 __HEAD <<
513 .global _start <<
514 _start: <<
515 /* Init r0 to zero as per spec */ <<
516 CLEAR_GPR(r0) <<
517 <<
518 /* save kernel parameters */ <<
519 l.or r25,r0,r3 /* pointer to <<
520 <<
521 /* <<
522 * ensure a deterministic start <<
523 */ <<
524 <<
525 l.ori r3,r0,0x1 <<
526 l.mtspr r0,r3,SPR_SR <<
527 <<
528 /* <<
529 * Start the TTCR as early as possible <<
530 * measurements of boot time from the <<
531 * important is that the TTCR does not <<
532 * random_init(). <<
533 */ <<
534 l.movhi r3,hi(SPR_TTMR_CR) <<
535 l.mtspr r0,r3,SPR_TTMR <<
536 <<
537 CLEAR_GPR(r1) <<
538 CLEAR_GPR(r2) <<
539 CLEAR_GPR(r3) <<
540 CLEAR_GPR(r4) <<
541 CLEAR_GPR(r5) <<
542 CLEAR_GPR(r6) <<
543 CLEAR_GPR(r7) <<
544 CLEAR_GPR(r8) <<
545 CLEAR_GPR(r9) <<
546 CLEAR_GPR(r10) <<
547 CLEAR_GPR(r11) <<
548 CLEAR_GPR(r12) <<
549 CLEAR_GPR(r13) <<
550 CLEAR_GPR(r14) <<
551 CLEAR_GPR(r15) <<
552 CLEAR_GPR(r16) <<
553 CLEAR_GPR(r17) <<
554 CLEAR_GPR(r18) <<
555 CLEAR_GPR(r19) <<
556 CLEAR_GPR(r20) <<
557 CLEAR_GPR(r21) <<
558 CLEAR_GPR(r22) <<
559 CLEAR_GPR(r23) <<
560 CLEAR_GPR(r24) <<
561 CLEAR_GPR(r26) <<
562 CLEAR_GPR(r27) <<
563 CLEAR_GPR(r28) <<
564 CLEAR_GPR(r29) <<
565 CLEAR_GPR(r30) <<
566 CLEAR_GPR(r31) <<
567 34
568 #ifdef CONFIG_SMP 35 #ifdef CONFIG_SMP
569 l.mfspr r26,r0,SPR_COREID !! 36 .align 3
570 l.sfeq r26,r0 !! 37 .globl __smp_callin
571 l.bnf secondary_wait !! 38 .ent __smp_callin
572 l.nop !! 39 /* On entry here from SRM console, the HWPCB of the per-cpu
573 #endif !! 40 slot for this processor has been loaded. We've arranged
574 /* !! 41 for the UNIQUE value for this process to contain the PCBB
575 * set up initial ksp and current !! 42 of the target idle task. */
576 */ !! 43 __smp_callin:
577 /* setup kernel stack */ !! 44 .prologue 1
578 LOAD_SYMBOL_2_GPR(r1,init_thread_union !! 45 ldgp $29,0($27) # First order of business, load the GP.
579 LOAD_SYMBOL_2_GPR(r10,init_thread_unio !! 46
580 tophys (r31,r10) !! 47 call_pal PAL_rduniq # Grab the target PCBB.
581 l.sw TI_KSP(r31), r1 !! 48 mov $0,$16 # Install it.
582 !! 49 call_pal PAL_swpctx
583 l.ori r4,r0,0x0 !! 50
584 !! 51 lda $8,0x3fff # Find "current".
585 !! 52 bic $30,$8,$8
586 /* !! 53
587 * .data contains initialized data, !! 54 jsr $26,smp_callin
588 * .bss contains uninitialized data - !! 55 call_pal PAL_halt
589 */ !! 56 .end __smp_callin
590 clear_bss: !! 57 #endif /* CONFIG_SMP */
591 LOAD_SYMBOL_2_GPR(r24, __bss_start) !! 58
592 LOAD_SYMBOL_2_GPR(r26, _end) !! 59 #
593 tophys(r28,r24) !! 60 # The following two functions are needed for supporting SRM PALcode
594 tophys(r30,r26) !! 61 # on the PC164 (at least), since that PALcode manages the interrupt
595 CLEAR_GPR(r24) !! 62 # masking, and we cannot duplicate the effort without causing problems
596 CLEAR_GPR(r26) !! 63 #
597 1: !! 64
598 l.sw (0)(r28),r0 !! 65 .align 3
599 l.sfltu r28,r30 !! 66 .globl cserve_ena
600 l.bf 1b !! 67 .ent cserve_ena
601 l.addi r28,r28,4 !! 68 cserve_ena:
602 !! 69 .prologue 0
603 enable_ic: !! 70 bis $16,$16,$17
604 l.jal _ic_enable !! 71 lda $16,52($31)
605 l.nop !! 72 call_pal PAL_cserve
606 !! 73 ret ($26)
607 enable_dc: !! 74 .end cserve_ena
608 l.jal _dc_enable !! 75
609 l.nop !! 76 .align 3
610 !! 77 .globl cserve_dis
611 flush_tlb: !! 78 .ent cserve_dis
612 l.jal _flush_tlb !! 79 cserve_dis:
613 l.nop !! 80 .prologue 0
614 !! 81 bis $16,$16,$17
615 /* The MMU needs to be enabled before or1k_ear !! 82 lda $16,53($31)
616 !! 83 call_pal PAL_cserve
617 enable_mmu: !! 84 ret ($26)
618 /* !! 85 .end cserve_dis
619 * enable dmmu & immu !! 86
620 * SR[5] = 0, SR[6] = 0, 6th and 7th b !! 87 #
621 */ !! 88 # It is handy, on occasion, to make halt actually just loop.
622 l.mfspr r30,r0,SPR_SR !! 89 # Putting it here means we dont have to recompile the whole
623 l.movhi r28,hi(SPR_SR_DME | SPR_SR_IME !! 90 # kernel.
624 l.ori r28,r28,lo(SPR_SR_DME | SPR_SR !! 91 #
625 l.or r30,r30,r28 !! 92
626 l.mtspr r0,r30,SPR_SR !! 93 .align 3
627 l.nop !! 94 .globl halt
628 l.nop !! 95 .ent halt
629 l.nop !! 96 halt:
630 l.nop !! 97 .prologue 0
631 l.nop !! 98 call_pal PAL_halt
632 l.nop !! 99 .end halt
633 l.nop <<
634 l.nop <<
635 l.nop <<
636 l.nop <<
637 l.nop <<
638 l.nop <<
639 l.nop <<
640 l.nop <<
641 l.nop <<
642 l.nop <<
643 <<
644 // reset the simulation counters <<
645 l.nop 5 <<
646 <<
647 /* check fdt header magic word */ <<
648 l.lwz r3,0(r25) /* load magic <<
649 l.movhi r4,hi(OF_DT_HEADER) <<
650 l.ori r4,r4,lo(OF_DT_HEADER) <<
651 l.sfeq r3,r4 <<
652 l.bf _fdt_found <<
653 l.nop <<
654 /* magic number mismatch, set fdt poin <<
655 l.or r25,r0,r0 <<
656 _fdt_found: <<
657 /* pass fdt pointer to or1k_early_setu <<
658 l.or r3,r0,r25 <<
659 LOAD_SYMBOL_2_GPR(r24, or1k_early_setu <<
660 l.jalr r24 <<
661 l.nop <<
662 <<
663 clear_regs: <<
664 /* <<
665 * clear all GPRS to increase determin <<
666 */ <<
667 CLEAR_GPR(r2) <<
668 CLEAR_GPR(r3) <<
669 CLEAR_GPR(r4) <<
670 CLEAR_GPR(r5) <<
671 CLEAR_GPR(r6) <<
672 CLEAR_GPR(r7) <<
673 CLEAR_GPR(r8) <<
674 CLEAR_GPR(r9) <<
675 CLEAR_GPR(r11) <<
676 CLEAR_GPR(r12) <<
677 CLEAR_GPR(r13) <<
678 CLEAR_GPR(r14) <<
679 CLEAR_GPR(r15) <<
680 CLEAR_GPR(r16) <<
681 CLEAR_GPR(r17) <<
682 CLEAR_GPR(r18) <<
683 CLEAR_GPR(r19) <<
684 CLEAR_GPR(r20) <<
685 CLEAR_GPR(r21) <<
686 CLEAR_GPR(r22) <<
687 CLEAR_GPR(r23) <<
688 CLEAR_GPR(r24) <<
689 CLEAR_GPR(r25) <<
690 CLEAR_GPR(r26) <<
691 CLEAR_GPR(r27) <<
692 CLEAR_GPR(r28) <<
693 CLEAR_GPR(r29) <<
694 CLEAR_GPR(r30) <<
695 CLEAR_GPR(r31) <<
696 <<
697 jump_start_kernel: <<
698 /* <<
699 * jump to kernel entry (start_kernel) <<
700 */ <<
701 LOAD_SYMBOL_2_GPR(r30, start_kernel) <<
702 l.jr r30 <<
703 l.nop <<
704 <<
705 _flush_tlb: <<
706 /* <<
707 * I N V A L I D A T E T L B e n <<
708 */ <<
709 LOAD_SYMBOL_2_GPR(r5,SPR_DTLBMR_BASE(0 <<
710 LOAD_SYMBOL_2_GPR(r6,SPR_ITLBMR_BASE(0 <<
711 l.addi r7,r0,128 /* Maximum number of <<
712 1: <<
713 l.mtspr r5,r0,0x0 <<
714 l.mtspr r6,r0,0x0 <<
715 <<
716 l.addi r5,r5,1 <<
717 l.addi r6,r6,1 <<
718 l.sfeq r7,r0 <<
719 l.bnf 1b <<
720 l.addi r7,r7,-1 <<
721 <<
722 l.jr r9 <<
723 l.nop <<
724 <<
725 #ifdef CONFIG_SMP <<
726 secondary_wait: <<
727 /* Doze the cpu until we are asked to <<
728 /* If we dont have power management sk <<
729 l.mfspr r25,r0,SPR_UPR <<
730 l.andi r25,r25,SPR_UPR_PMP <<
731 l.sfeq r25,r0 <<
732 l.bf secondary_check_release <<
733 l.nop <<
734 <<
735 /* Setup special secondary exception h <<
736 LOAD_SYMBOL_2_GPR(r3, _secondary_evbar <<
737 tophys(r25,r3) <<
738 l.mtspr r0,r25,SPR_EVBAR <<
739 <<
740 /* Enable Interrupts */ <<
741 l.mfspr r25,r0,SPR_SR <<
742 l.ori r25,r25,SPR_SR_IEE <<
743 l.mtspr r0,r25,SPR_SR <<
744 <<
745 /* Unmask interrupts interrupts */ <<
746 l.mfspr r25,r0,SPR_PICMR <<
747 l.ori r25,r25,0xffff <<
748 l.mtspr r0,r25,SPR_PICMR <<
749 <<
750 /* Doze */ <<
751 l.mfspr r25,r0,SPR_PMR <<
752 LOAD_SYMBOL_2_GPR(r3, SPR_PMR_DME) <<
753 l.or r25,r25,r3 <<
754 l.mtspr r0,r25,SPR_PMR <<
755 <<
756 /* Wakeup - Restore exception handler <<
757 l.mtspr r0,r0,SPR_EVBAR <<
758 <<
759 secondary_check_release: <<
760 /* <<
761 * Check if we actually got the releas <<
762 * sleep. <<
763 */ <<
764 l.mfspr r25,r0,SPR_COREID <<
765 LOAD_SYMBOL_2_GPR(r3, secondary_releas <<
766 tophys(r4, r3) <<
767 l.lwz r3,0(r4) <<
768 l.sfeq r25,r3 <<
769 l.bnf secondary_wait <<
770 l.nop <<
771 /* fall through to secondary_init */ <<
772 <<
773 secondary_init: <<
774 /* <<
775 * set up initial ksp and current <<
776 */ <<
777 LOAD_SYMBOL_2_GPR(r10, secondary_threa <<
778 tophys (r30,r10) <<
779 l.lwz r10,0(r30) <<
780 l.addi r1,r10,THREAD_SIZE <<
781 tophys (r30,r10) <<
782 l.sw TI_KSP(r30),r1 <<
783 <<
784 l.jal _ic_enable <<
785 l.nop <<
786 <<
787 l.jal _dc_enable <<
788 l.nop <<
789 <<
790 l.jal _flush_tlb <<
791 l.nop <<
792 <<
793 /* <<
794 * enable dmmu & immu <<
795 */ <<
796 l.mfspr r30,r0,SPR_SR <<
797 l.movhi r28,hi(SPR_SR_DME | SPR_SR_IME <<
798 l.ori r28,r28,lo(SPR_SR_DME | SPR_SR <<
799 l.or r30,r30,r28 <<
800 /* <<
801 * This is a bit tricky, we need to sw <<
802 * to virtual addresses on the fly. <<
803 * To do that, we first set up ESR wit <<
804 * Then EPCR is set to secondary_start <<
805 * "jump" to that. <<
806 */ <<
807 l.mtspr r0,r30,SPR_ESR_BASE <<
808 LOAD_SYMBOL_2_GPR(r30, secondary_start <<
809 l.mtspr r0,r30,SPR_EPCR_BASE <<
810 l.rfe <<
811 <<
812 secondary_start: <<
813 LOAD_SYMBOL_2_GPR(r30, secondary_start <<
814 l.jr r30 <<
815 l.nop <<
816 <<
817 #endif <<
818 <<
819 /* ========================================[ c <<
820 <<
821 /* alignment here so we don't change m <<
822 * memory controller defined <<
823 */ <<
824 .align 0x2000 <<
825 <<
826 _ic_enable: <<
827 /* Check if IC present and skip enabli <<
828 l.mfspr r24,r0,SPR_UPR <<
829 l.andi r26,r24,SPR_UPR_ICP <<
830 l.sfeq r26,r0 <<
831 l.bf 9f <<
832 l.nop <<
833 <<
834 /* Disable IC */ <<
835 l.mfspr r6,r0,SPR_SR <<
836 l.addi r5,r0,-1 <<
837 l.xori r5,r5,SPR_SR_ICE <<
838 l.and r5,r6,r5 <<
839 l.mtspr r0,r5,SPR_SR <<
840 <<
841 /* Establish cache block size <<
842 If BS=0, 16; <<
843 If BS=1, 32; <<
844 r14 contain block size <<
845 */ <<
846 l.mfspr r24,r0,SPR_ICCFGR <<
847 l.andi r26,r24,SPR_ICCFGR_CBS <<
848 l.srli r28,r26,7 <<
849 l.ori r30,r0,16 <<
850 l.sll r14,r30,r28 <<
851 <<
852 /* Establish number of cache sets <<
853 r16 contains number of cache sets <<
854 r28 contains log(# of cache sets) <<
855 */ <<
856 l.andi r26,r24,SPR_ICCFGR_NCS <<
857 l.srli r28,r26,3 <<
858 l.ori r30,r0,1 <<
859 l.sll r16,r30,r28 <<
860 <<
861 /* Invalidate IC */ <<
862 l.addi r6,r0,0 <<
863 l.sll r5,r14,r28 <<
864 // l.mul r5,r14,r16 <<
865 // l.trap 1 <<
866 // l.addi r5,r0,IC_SIZE <<
867 1: <<
868 l.mtspr r0,r6,SPR_ICBIR <<
869 l.sfne r6,r5 <<
870 l.bf 1b <<
871 l.add r6,r6,r14 <<
872 // l.addi r6,r6,IC_LINE <<
873 <<
874 /* Enable IC */ <<
875 l.mfspr r6,r0,SPR_SR <<
876 l.ori r6,r6,SPR_SR_ICE <<
877 l.mtspr r0,r6,SPR_SR <<
878 l.nop <<
879 l.nop <<
880 l.nop <<
881 l.nop <<
882 l.nop <<
883 l.nop <<
884 l.nop <<
885 l.nop <<
886 l.nop <<
887 l.nop <<
888 9: <<
889 l.jr r9 <<
890 l.nop <<
891 <<
892 _dc_enable: <<
893 /* Check if DC present and skip enabli <<
894 l.mfspr r24,r0,SPR_UPR <<
895 l.andi r26,r24,SPR_UPR_DCP <<
896 l.sfeq r26,r0 <<
897 l.bf 9f <<
898 l.nop <<
899 <<
900 /* Disable DC */ <<
901 l.mfspr r6,r0,SPR_SR <<
902 l.addi r5,r0,-1 <<
903 l.xori r5,r5,SPR_SR_DCE <<
904 l.and r5,r6,r5 <<
905 l.mtspr r0,r5,SPR_SR <<
906 <<
907 /* Establish cache block size <<
908 If BS=0, 16; <<
909 If BS=1, 32; <<
910 r14 contain block size <<
911 */ <<
912 l.mfspr r24,r0,SPR_DCCFGR <<
913 l.andi r26,r24,SPR_DCCFGR_CBS <<
914 l.srli r28,r26,7 <<
915 l.ori r30,r0,16 <<
916 l.sll r14,r30,r28 <<
917 <<
918 /* Establish number of cache sets <<
919 r16 contains number of cache sets <<
920 r28 contains log(# of cache sets) <<
921 */ <<
922 l.andi r26,r24,SPR_DCCFGR_NCS <<
923 l.srli r28,r26,3 <<
924 l.ori r30,r0,1 <<
925 l.sll r16,r30,r28 <<
926 <<
927 /* Invalidate DC */ <<
928 l.addi r6,r0,0 <<
929 l.sll r5,r14,r28 <<
930 1: <<
931 l.mtspr r0,r6,SPR_DCBIR <<
932 l.sfne r6,r5 <<
933 l.bf 1b <<
934 l.add r6,r6,r14 <<
935 <<
936 /* Enable DC */ <<
937 l.mfspr r6,r0,SPR_SR <<
938 l.ori r6,r6,SPR_SR_DCE <<
939 l.mtspr r0,r6,SPR_SR <<
940 9: <<
941 l.jr r9 <<
942 l.nop <<
943 <<
944 /* =========================================== <<
945 <<
946 #define DTLB_UP_CONVERT_MASK 0x3fa <<
947 #define ITLB_UP_CONVERT_MASK 0x3a <<
948 <<
949 /* for SMP we'd have (this is a bit subtle, CC <<
950 * for SMP, but since we have _PAGE_PRESENT bi <<
951 * we can just modify the mask) <<
952 */ <<
953 #define DTLB_SMP_CONVERT_MASK 0x3fb <<
954 #define ITLB_SMP_CONVERT_MASK 0x3b <<
955 <<
956 /* ---[ boot dtlb miss handler ]-------------- <<
957 <<
958 boot_dtlb_miss_handler: <<
959 <<
960 /* mask for DTLB_MR register: - (0) sets V (va <<
961 * - (31-12) sets b <<
962 */ <<
963 #define DTLB_MR_MASK 0xfffff001 <<
964 <<
965 /* mask for DTLB_TR register: - (2) sets CI (c <<
966 * - (4) sets A (ac <<
967 * - (5) sets D (di <<
968 * - (8) sets SRE ( <<
969 * - (9) sets SWE ( <<
970 * - (31-12) sets b <<
971 */ <<
972 #define DTLB_TR_MASK 0xfffff332 <<
973 <<
974 /* These are for masking out the VPN/PPN value <<
975 * it's not the same as the PFN */ <<
976 #define VPN_MASK 0xfffff000 <<
977 #define PPN_MASK 0xfffff000 <<
978 <<
979 <<
980 EXCEPTION_STORE_GPR6 <<
981 <<
982 #if 0 <<
983 l.mfspr r6,r0,SPR_ESR_BASE // <<
984 l.andi r6,r6,SPR_SR_SM // <<
985 l.sfeqi r6,0 // <<
986 l.bf exit_with_no_dtranslation // <<
987 l.nop <<
988 #endif <<
989 <<
990 /* this could be optimized by moving s <<
991 * non r6 registers here, and jumping <<
992 * if not in supervisor mode <<
993 */ <<
994 <<
995 EXCEPTION_STORE_GPR2 <<
996 EXCEPTION_STORE_GPR3 <<
997 EXCEPTION_STORE_GPR4 <<
998 EXCEPTION_STORE_GPR5 <<
999 <<
1000 l.mfspr r4,r0,SPR_EEAR_BASE // <<
1001 <<
1002 immediate_translation: <<
1003 CLEAR_GPR(r6) <<
1004 <<
1005 l.srli r3,r4,0xd // <<
1006 <<
1007 l.mfspr r6, r0, SPR_DMMUCFGR <<
1008 l.andi r6, r6, SPR_DMMUCFGR_NTS <<
1009 l.srli r6, r6, SPR_DMMUCFGR_NTS_OFF <<
1010 l.ori r5, r0, 0x1 <<
1011 l.sll r5, r5, r6 // r5 = numbe <<
1012 l.addi r6, r5, -1 // r6 = nsets <<
1013 l.and r2, r3, r6 // r2 <- r3 % <<
1014 <<
1015 l.or r6,r6,r4 // <<
1016 l.ori r6,r6,~(VPN_MASK) // <<
1017 l.movhi r5,hi(DTLB_MR_MASK) // <<
1018 l.ori r5,r5,lo(DTLB_MR_MASK) // <<
1019 l.and r5,r5,r6 // <<
1020 l.mtspr r2,r5,SPR_DTLBMR_BASE(0) // <<
1021 <<
1022 /* set up DTLB with no translation fo <<
1023 LOAD_SYMBOL_2_GPR(r6,0xbfffffff) <<
1024 l.sfgeu r6,r4 // <<
1025 l.bf 1f // <<
1026 l.and r3,r4,r4 // <<
1027 <<
1028 tophys(r3,r4) // <<
1029 1: <<
1030 l.ori r3,r3,~(PPN_MASK) // <<
1031 l.movhi r5,hi(DTLB_TR_MASK) // <<
1032 l.ori r5,r5,lo(DTLB_TR_MASK) // <<
1033 l.and r5,r5,r3 // <<
1034 l.mtspr r2,r5,SPR_DTLBTR_BASE(0) // <<
1035 <<
1036 EXCEPTION_LOAD_GPR6 <<
1037 EXCEPTION_LOAD_GPR5 <<
1038 EXCEPTION_LOAD_GPR4 <<
1039 EXCEPTION_LOAD_GPR3 <<
1040 EXCEPTION_LOAD_GPR2 <<
1041 <<
1042 l.rfe // <<
1043 <<
1044 exit_with_no_dtranslation: <<
1045 /* EA out of memory or not in supervi <<
1046 EXCEPTION_LOAD_GPR6 <<
1047 EXCEPTION_LOAD_GPR4 <<
1048 l.j _dispatch_bus_fault <<
1049 <<
1050 /* ---[ boot itlb miss handler ]------------- <<
1051 <<
1052 boot_itlb_miss_handler: <<
1053 <<
1054 /* mask for ITLB_MR register: - sets V (valid <<
1055 * - sets bits bel <<
1056 */ <<
1057 #define ITLB_MR_MASK 0xfffff001 <<
1058 <<
1059 /* mask for ITLB_TR register: - sets A (acces <<
1060 * - sets SXE (sup <<
1061 * - sets bits bel <<
1062 */ <<
1063 #define ITLB_TR_MASK 0xfffff050 <<
1064 <<
1065 /* <<
1066 #define VPN_MASK 0xffffe000 <<
1067 #define PPN_MASK 0xffffe000 <<
1068 */ <<
1069 <<
1070 <<
1071 <<
1072 EXCEPTION_STORE_GPR2 <<
1073 EXCEPTION_STORE_GPR3 <<
1074 EXCEPTION_STORE_GPR4 <<
1075 EXCEPTION_STORE_GPR5 <<
1076 EXCEPTION_STORE_GPR6 <<
1077 <<
1078 #if 0 <<
1079 l.mfspr r6,r0,SPR_ESR_BASE // <<
1080 l.andi r6,r6,SPR_SR_SM // <<
1081 l.sfeqi r6,0 // <<
1082 l.bf exit_with_no_itranslation <<
1083 l.nop <<
1084 #endif <<
1085 <<
1086 <<
1087 l.mfspr r4,r0,SPR_EEAR_BASE // <<
1088 <<
1089 earlyearly: <<
1090 CLEAR_GPR(r6) <<
1091 <<
1092 l.srli r3,r4,0xd // <<
1093 <<
1094 l.mfspr r6, r0, SPR_IMMUCFGR <<
1095 l.andi r6, r6, SPR_IMMUCFGR_NTS <<
1096 l.srli r6, r6, SPR_IMMUCFGR_NTS_OFF <<
1097 l.ori r5, r0, 0x1 <<
1098 l.sll r5, r5, r6 // r5 = numbe <<
1099 l.addi r6, r5, -1 // r6 = nsets <<
1100 l.and r2, r3, r6 // r2 <- r3 % <<
1101 <<
1102 l.or r6,r6,r4 // <<
1103 l.ori r6,r6,~(VPN_MASK) // <<
1104 l.movhi r5,hi(ITLB_MR_MASK) // <<
1105 l.ori r5,r5,lo(ITLB_MR_MASK) // <<
1106 l.and r5,r5,r6 // <<
1107 l.mtspr r2,r5,SPR_ITLBMR_BASE(0) // <<
1108 <<
1109 /* <<
1110 * set up ITLB with no translation fo <<
1111 * <<
1112 * we need this for head.S mapping (E <<
1113 * which run with mmu enabled into en <<
1114 * <<
1115 */ <<
1116 LOAD_SYMBOL_2_GPR(r6,0x0fffffff) <<
1117 l.sfgeu r6,r4 // <<
1118 l.bf 1f // <<
1119 l.and r3,r4,r4 // <<
1120 <<
1121 tophys(r3,r4) // <<
1122 1: <<
1123 l.ori r3,r3,~(PPN_MASK) // <<
1124 l.movhi r5,hi(ITLB_TR_MASK) // <<
1125 l.ori r5,r5,lo(ITLB_TR_MASK) // <<
1126 l.and r5,r5,r3 // <<
1127 l.mtspr r2,r5,SPR_ITLBTR_BASE(0) // <<
1128 <<
1129 EXCEPTION_LOAD_GPR6 <<
1130 EXCEPTION_LOAD_GPR5 <<
1131 EXCEPTION_LOAD_GPR4 <<
1132 EXCEPTION_LOAD_GPR3 <<
1133 EXCEPTION_LOAD_GPR2 <<
1134 <<
1135 l.rfe // <<
1136 <<
1137 exit_with_no_itranslation: <<
1138 EXCEPTION_LOAD_GPR4 <<
1139 EXCEPTION_LOAD_GPR6 <<
1140 l.j _dispatch_bus_fault <<
1141 l.nop <<
1142 <<
1143 /* ========================================== <<
1144 /* <<
1145 * Stuff below here shouldn't go into .head s <<
1146 * can be moved to entry.S ??? <<
1147 */ <<
1148 <<
1149 /* ========================================== <<
1150 <<
1151 /* <<
1152 * Comments: <<
1153 * Exception handlers are entered with MMU <<
1154 * needs to use physical addressing <<
1155 * <<
1156 */ <<
1157 <<
1158 .text <<
1159 ENTRY(dtlb_miss_handler) <<
1160 EXCEPTION_STORE_GPR2 <<
1161 EXCEPTION_STORE_GPR3 <<
1162 EXCEPTION_STORE_GPR4 <<
1163 /* <<
1164 * get EA of the miss <<
1165 */ <<
1166 l.mfspr r2,r0,SPR_EEAR_BASE <<
1167 /* <<
1168 * pmd = (pmd_t *)(current_pgd + pgd_ <<
1169 */ <<
1170 GET_CURRENT_PGD(r3,r4) // r3 <<
1171 l.srli r4,r2,0x18 // >> <<
1172 l.slli r4,r4,0x2 // to <<
1173 l.add r3,r4,r3 // r4 <<
1174 /* <<
1175 * if (pmd_none(*pmd)) <<
1176 * goto pmd_none: <<
1177 */ <<
1178 tophys (r4,r3) <<
1179 l.lwz r3,0x0(r4) // ge <<
1180 l.sfne r3,r0 <<
1181 l.bnf d_pmd_none <<
1182 l.addi r3,r0,0xffffe000 // PA <<
1183 <<
1184 d_pmd_good: <<
1185 /* <<
1186 * pte = *pte_offset(pmd, daddr); <<
1187 */ <<
1188 l.lwz r4,0x0(r4) // ge <<
1189 l.and r4,r4,r3 // & <<
1190 l.srli r2,r2,0xd // >> <<
1191 l.andi r3,r2,0x7ff // (1 <<
1192 l.slli r3,r3,0x2 // to <<
1193 l.add r3,r3,r4 <<
1194 l.lwz r3,0x0(r3) // th <<
1195 /* <<
1196 * if (!pte_present(pte)) <<
1197 */ <<
1198 l.andi r4,r3,0x1 <<
1199 l.sfne r4,r0 // is <<
1200 l.bnf d_pte_not_present <<
1201 l.addi r4,r0,0xffffe3fa // PA <<
1202 /* <<
1203 * fill DTLB TR register <<
1204 */ <<
1205 l.and r4,r3,r4 // ap <<
1206 // Determine number of DMMU sets <<
1207 l.mfspr r2, r0, SPR_DMMUCFGR <<
1208 l.andi r2, r2, SPR_DMMUCFGR_NTS <<
1209 l.srli r2, r2, SPR_DMMUCFGR_NTS_OFF <<
1210 l.ori r3, r0, 0x1 <<
1211 l.sll r3, r3, r2 // r3 = numbe <<
1212 l.addi r2, r3, -1 // r2 = nsets <<
1213 l.mfspr r3, r0, SPR_EEAR_BASE <<
1214 l.srli r3, r3, 0xd // >> PAGE_SH <<
1215 l.and r2, r3, r2 // calc offse <<
1216 <<
1217 l.mtspr r2,r4,SPR_DTLBTR_BASE(0) <<
1218 /* <<
1219 * fill DTLB MR register <<
1220 */ <<
1221 l.slli r3, r3, 0xd /* << <<
1222 l.ori r4,r3,0x1 // se <<
1223 l.mtspr r2,r4,SPR_DTLBMR_BASE(0) <<
1224 <<
1225 EXCEPTION_LOAD_GPR2 <<
1226 EXCEPTION_LOAD_GPR3 <<
1227 EXCEPTION_LOAD_GPR4 <<
1228 l.rfe <<
1229 d_pmd_none: <<
1230 d_pte_not_present: <<
1231 EXCEPTION_LOAD_GPR2 <<
1232 EXCEPTION_LOAD_GPR3 <<
1233 EXCEPTION_LOAD_GPR4 <<
1234 EXCEPTION_HANDLE(_dtlb_miss_page_faul <<
1235 <<
1236 /* ========================================== <<
1237 ENTRY(itlb_miss_handler) <<
1238 EXCEPTION_STORE_GPR2 <<
1239 EXCEPTION_STORE_GPR3 <<
1240 EXCEPTION_STORE_GPR4 <<
1241 /* <<
1242 * get EA of the miss <<
1243 */ <<
1244 l.mfspr r2,r0,SPR_EEAR_BASE <<
1245 <<
1246 /* <<
1247 * pmd = (pmd_t *)(current_pgd + pgd_ <<
1248 * <<
1249 */ <<
1250 GET_CURRENT_PGD(r3,r4) // r3 <<
1251 l.srli r4,r2,0x18 // >> <<
1252 l.slli r4,r4,0x2 // to <<
1253 l.add r3,r4,r3 // r4 <<
1254 /* <<
1255 * if (pmd_none(*pmd)) <<
1256 * goto pmd_none: <<
1257 */ <<
1258 tophys (r4,r3) <<
1259 l.lwz r3,0x0(r4) // ge <<
1260 l.sfne r3,r0 <<
1261 l.bnf i_pmd_none <<
1262 l.addi r3,r0,0xffffe000 // PA <<
1263 <<
1264 i_pmd_good: <<
1265 /* <<
1266 * pte = *pte_offset(pmd, iaddr); <<
1267 * <<
1268 */ <<
1269 l.lwz r4,0x0(r4) // ge <<
1270 l.and r4,r4,r3 // & <<
1271 l.srli r2,r2,0xd // >> <<
1272 l.andi r3,r2,0x7ff // (1 <<
1273 l.slli r3,r3,0x2 // to <<
1274 l.add r3,r3,r4 <<
1275 l.lwz r3,0x0(r3) // th <<
1276 /* <<
1277 * if (!pte_present(pte)) <<
1278 * <<
1279 */ <<
1280 l.andi r4,r3,0x1 <<
1281 l.sfne r4,r0 // is <<
1282 l.bnf i_pte_not_present <<
1283 l.addi r4,r0,0xffffe03a // PA <<
1284 /* <<
1285 * fill ITLB TR register <<
1286 */ <<
1287 l.and r4,r3,r4 // ap <<
1288 l.andi r3,r3,0x7c0 // _P <<
1289 l.sfeq r3,r0 <<
1290 l.bf itlb_tr_fill //_workaround <<
1291 // Determine number of IMMU sets <<
1292 l.mfspr r2, r0, SPR_IMMUCFGR <<
1293 l.andi r2, r2, SPR_IMMUCFGR_NTS <<
1294 l.srli r2, r2, SPR_IMMUCFGR_NTS_OFF <<
1295 l.ori r3, r0, 0x1 <<
1296 l.sll r3, r3, r2 // r3 = numbe <<
1297 l.addi r2, r3, -1 // r2 = nsets <<
1298 l.mfspr r3, r0, SPR_EEAR_BASE <<
1299 l.srli r3, r3, 0xd // >> PAGE_SH <<
1300 l.and r2, r3, r2 // calc offse <<
1301 <<
1302 /* <<
1303 * __PHX__ :: fixme <<
1304 * we should not just blindly set executable <<
1305 * but it does help with ping. the clean way <<
1306 * (and fix it) why stack doesn't have execut <<
1307 */ <<
1308 <<
1309 itlb_tr_fill_workaround: <<
1310 l.ori r4,r4,0xc0 // | <<
1311 itlb_tr_fill: <<
1312 l.mtspr r2,r4,SPR_ITLBTR_BASE(0) <<
1313 /* <<
1314 * fill DTLB MR register <<
1315 */ <<
1316 l.slli r3, r3, 0xd /* << <<
1317 l.ori r4,r3,0x1 // se <<
1318 l.mtspr r2,r4,SPR_ITLBMR_BASE(0) <<
1319 <<
1320 EXCEPTION_LOAD_GPR2 <<
1321 EXCEPTION_LOAD_GPR3 <<
1322 EXCEPTION_LOAD_GPR4 <<
1323 l.rfe <<
1324 <<
1325 i_pmd_none: <<
1326 i_pte_not_present: <<
1327 EXCEPTION_LOAD_GPR2 <<
1328 EXCEPTION_LOAD_GPR3 <<
1329 EXCEPTION_LOAD_GPR4 <<
1330 EXCEPTION_HANDLE(_itlb_miss_page_faul <<
1331 <<
1332 /* ========================================== <<
1333 <<
1334 <<
1335 /* ========================================== <<
1336 <<
1337 /* <<
1338 * DESC: Prints ASCII character stored in r7 <<
1339 * <<
1340 * PRMS: r7 - a 32-bit value with an ASCI <<
1341 * position. <<
1342 * <<
1343 * PREQ: The UART at UART_BASE_ADD has to be <<
1344 * <<
1345 * POST: internally used but restores: <<
1346 * r4 - to store UART_BASE_ADD <<
1347 * r5 - for loading OFF_TXFULL / TH <<
1348 * r6 - for storing bitmask (SERIAL <<
1349 */ <<
1350 ENTRY(_emergency_putc) <<
1351 EMERGENCY_PRINT_STORE_GPR4 <<
1352 EMERGENCY_PRINT_STORE_GPR5 <<
1353 EMERGENCY_PRINT_STORE_GPR6 <<
1354 <<
1355 l.movhi r4,hi(UART_BASE_ADD) <<
1356 l.ori r4,r4,lo(UART_BASE_ADD) <<
1357 <<
1358 #if defined(CONFIG_SERIAL_LITEUART) <<
1359 /* Check OFF_TXFULL status */ <<
1360 1: l.lwz r5,4(r4) <<
1361 l.andi r5,r5,0xff <<
1362 l.sfnei r5,0 <<
1363 l.bf 1b <<
1364 l.nop <<
1365 <<
1366 /* Write character */ <<
1367 l.andi r7,r7,0xff <<
1368 l.sw 0(r4),r7 <<
1369 #elif defined(CONFIG_SERIAL_8250) <<
1370 /* Check UART LSR THRE (hold) bit */ <<
1371 l.addi r6,r0,0x20 <<
1372 1: l.lbz r5,5(r4) <<
1373 l.andi r5,r5,0x20 <<
1374 l.sfeq r5,r6 <<
1375 l.bnf 1b <<
1376 l.nop <<
1377 <<
1378 /* Write character */ <<
1379 l.sb 0(r4),r7 <<
1380 <<
1381 /* Check UART LSR THRE|TEMT (hold, em <<
1382 l.addi r6,r0,0x60 <<
1383 1: l.lbz r5,5(r4) <<
1384 l.andi r5,r5,0x60 <<
1385 l.sfeq r5,r6 <<
1386 l.bnf 1b <<
1387 l.nop <<
1388 #endif <<
1389 EMERGENCY_PRINT_LOAD_GPR6 <<
1390 EMERGENCY_PRINT_LOAD_GPR5 <<
1391 EMERGENCY_PRINT_LOAD_GPR4 <<
1392 l.jr r9 <<
1393 l.nop <<
1394 <<
1395 /* <<
1396 * DSCR: prints a string referenced by r3. <<
1397 * <<
1398 * PRMS: r3 - address of the firs <<
1399 * terminated string to <<
1400 * <<
1401 * PREQ: UART at UART_BASE_ADD has to be init <<
1402 * <<
1403 * POST: caller should be aware that r3, r9 a <<
1404 */ <<
1405 ENTRY(_emergency_print) <<
1406 EMERGENCY_PRINT_STORE_GPR7 <<
1407 EMERGENCY_PRINT_STORE_GPR9 <<
1408 <<
1409 /* Load character to r7, check for nu <<
1410 2: l.lbz r7,0(r3) <<
1411 l.sfeqi r7,0x0 <<
1412 l.bf 9f <<
1413 l.nop <<
1414 <<
1415 l.jal _emergency_putc <<
1416 l.nop <<
1417 <<
1418 /* next character */ <<
1419 l.j 2b <<
1420 l.addi r3,r3,0x1 <<
1421 <<
1422 9: <<
1423 EMERGENCY_PRINT_LOAD_GPR9 <<
1424 EMERGENCY_PRINT_LOAD_GPR7 <<
1425 l.jr r9 <<
1426 l.nop <<
1427 <<
1428 /* <<
1429 * DSCR: prints a number in r3 in hex. <<
1430 * <<
1431 * PRMS: r3 - a 32-bit unsigned i <<
1432 * <<
1433 * PREQ: UART at UART_BASE_ADD has to be init <<
1434 * <<
1435 * POST: caller should be aware that r3, r9 a <<
1436 */ <<
1437 ENTRY(_emergency_print_nr) <<
1438 EMERGENCY_PRINT_STORE_GPR7 <<
1439 EMERGENCY_PRINT_STORE_GPR8 <<
1440 EMERGENCY_PRINT_STORE_GPR9 <<
1441 <<
1442 l.addi r8,r0,32 // sh <<
1443 <<
1444 1: /* remove leading zeros */ <<
1445 l.addi r8,r8,-0x4 <<
1446 l.srl r7,r3,r8 <<
1447 l.andi r7,r7,0xf <<
1448 <<
1449 /* don't skip the last zero if number <<
1450 l.sfeqi r8,0x4 <<
1451 l.bf 2f <<
1452 l.nop <<
1453 <<
1454 l.sfeq r7,r0 <<
1455 l.bf 1b <<
1456 l.nop <<
1457 <<
1458 2: <<
1459 l.srl r7,r3,r8 <<
1460 <<
1461 l.andi r7,r7,0xf <<
1462 l.sflts r8,r0 <<
1463 l.bf 9f <<
1464 <<
1465 /* Numbers greater than 9 translate t <<
1466 l.sfgtui r7,0x9 <<
1467 l.bnf 8f <<
1468 l.nop <<
1469 l.addi r7,r7,0x27 <<
1470 <<
1471 /* Convert to ascii and output charac <<
1472 8: l.jal _emergency_putc <<
1473 l.addi r7,r7,0x30 <<
1474 <<
1475 /* next character */ <<
1476 l.j 2b <<
1477 l.addi r8,r8,-0x4 <<
1478 <<
1479 9: <<
1480 EMERGENCY_PRINT_LOAD_GPR9 <<
1481 EMERGENCY_PRINT_LOAD_GPR8 <<
1482 EMERGENCY_PRINT_LOAD_GPR7 <<
1483 l.jr r9 <<
1484 l.nop <<
1485 <<
1486 /* <<
1487 * This should be used for debugging only. <<
1488 * It messes up the Linux early serial output <<
1489 * somehow, so use it sparingly and essential <<
1490 * only if you need to debug something that g <<
1491 * before Linux gets the early serial going. <<
1492 * <<
1493 * Furthermore, you'll have to make sure you <<
1494 * UART_DEVISOR correctly according to the sy <<
1495 * clock rate. <<
1496 * <<
1497 * <<
1498 */ <<
1499 <<
1500 <<
1501 <<
1502 #define SYS_CLK 20000000 <<
1503 //#define SYS_CLK 1843200 <<
1504 #define OR32_CONSOLE_BAUD 115200 <<
1505 #define UART_DIVISOR SYS_CLK/(16*OR32_C <<
1506 <<
1507 ENTRY(_early_uart_init) <<
1508 l.movhi r3,hi(UART_BASE_ADD) <<
1509 l.ori r3,r3,lo(UART_BASE_ADD) <<
1510 <<
1511 #if defined(CONFIG_SERIAL_8250) <<
1512 l.addi r4,r0,0x7 <<
1513 l.sb 0x2(r3),r4 <<
1514 <<
1515 l.addi r4,r0,0x0 <<
1516 l.sb 0x1(r3),r4 <<
1517 <<
1518 l.addi r4,r0,0x3 <<
1519 l.sb 0x3(r3),r4 <<
1520 <<
1521 l.lbz r5,3(r3) <<
1522 l.ori r4,r5,0x80 <<
1523 l.sb 0x3(r3),r4 <<
1524 l.addi r4,r0,((UART_DIVISOR>>8) & 0x <<
1525 l.sb UART_DLM(r3),r4 <<
1526 l.addi r4,r0,((UART_DIVISOR) & 0x000 <<
1527 l.sb UART_DLL(r3),r4 <<
1528 l.sb 0x3(r3),r5 <<
1529 #endif <<
1530 <<
1531 l.jr r9 <<
1532 l.nop <<
1533 <<
1534 .align 0x1000 <<
1535 .global _secondary_evbar <<
1536 _secondary_evbar: <<
1537 <<
1538 .space 0x800 <<
1539 /* Just disable interrupts and Return <<
1540 l.ori r3,r0,SPR_SR_SM <<
1541 l.mtspr r0,r3,SPR_ESR_BASE <<
1542 l.rfe <<
1543 <<
1544 <<
1545 .section .rodata <<
1546 _string_unhandled_exception: <<
1547 .string "\r\nRunarunaround: Unhandled <<
1548 <<
1549 _string_epc_prefix: <<
1550 .string ": EPC=0x\0" <<
1551 <<
1552 _string_nl: <<
1553 .string "\r\n\0" <<
1554 <<
1555 <<
1556 /* ========================================[ <<
1557 <<
1558 /* <<
1559 * .data section should be page aligned <<
1560 * (look into arch/openrisc/kernel/vmlin <<
1561 */ <<
1562 .section .data,"aw" <<
1563 .align 8192 <<
1564 .global empty_zero_page <<
1565 empty_zero_page: <<
1566 .space 8192 <<
1567 <<
1568 .global swapper_pg_dir <<
1569 swapper_pg_dir: <<
1570 .space 8192 <<
1571 <<
1572 .global _unhandled_stack <<
1573 _unhandled_stack: <<
1574 .space 8192 <<
1575 _unhandled_stack_top: <<
1576 <<
1577 /* ========================================== <<
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