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f046ccd1 EL |
1 | /* |
2 | * Copyright (C) 1998 Dan Malek <dmalek@jlc.net> | |
3 | * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se> | |
4 | * Copyright (C) 2000, 2001,2002 Wolfgang Denk <wd@denx.de> | |
5 | * Copyright 2004 Freescale Semiconductor, Inc. | |
6 | * | |
7 | * See file CREDITS for list of people who contributed to this | |
8 | * project. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License as | |
12 | * published by the Free Software Foundation; either version 2 of | |
13 | * the License, or (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
23 | * MA 02111-1307 USA | |
24 | */ | |
25 | ||
26 | /* | |
27 | * U-Boot - Startup Code for MPC83xx PowerPC based Embedded Boards | |
28 | */ | |
29 | ||
30 | #include <config.h> | |
31 | #include <mpc83xx.h> | |
32 | #include <version.h> | |
33 | ||
34 | #define CONFIG_83XX 1 /* needed for Linux kernel header files*/ | |
35 | #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */ | |
36 | ||
37 | #include <ppc_asm.tmpl> | |
38 | #include <ppc_defs.h> | |
39 | ||
40 | #include <asm/cache.h> | |
41 | #include <asm/mmu.h> | |
42 | ||
43 | #ifndef CONFIG_IDENT_STRING | |
44 | #define CONFIG_IDENT_STRING "MPC83XX" | |
45 | #endif | |
46 | ||
47 | /* We don't want the MMU yet. | |
48 | */ | |
49 | #undef MSR_KERNEL | |
50 | ||
51 | /* | |
52 | * Floating Point enable, Machine Check and Recoverable Interr. | |
53 | */ | |
54 | #ifdef DEBUG | |
55 | #define MSR_KERNEL (MSR_FP|MSR_RI) | |
56 | #else | |
57 | #define MSR_KERNEL (MSR_FP|MSR_ME|MSR_RI) | |
58 | #endif | |
59 | ||
60 | /* | |
61 | * Set up GOT: Global Offset Table | |
62 | * | |
63 | * Use r14 to access the GOT | |
64 | */ | |
65 | START_GOT | |
66 | GOT_ENTRY(_GOT2_TABLE_) | |
67 | GOT_ENTRY(_FIXUP_TABLE_) | |
68 | ||
69 | GOT_ENTRY(_start) | |
70 | GOT_ENTRY(_start_of_vectors) | |
71 | GOT_ENTRY(_end_of_vectors) | |
72 | GOT_ENTRY(transfer_to_handler) | |
73 | ||
74 | GOT_ENTRY(__init_end) | |
75 | GOT_ENTRY(_end) | |
76 | GOT_ENTRY(__bss_start) | |
77 | END_GOT | |
78 | ||
79 | /* | |
80 | * Version string - must be in data segment because MPC83xx uses the | |
81 | * first 256 bytes for the Hard Reset Configuration Word table (see | |
82 | * below). Similarly, can't have the U-Boot Magic Number as the first | |
83 | * thing in the image - don't know how this will affect the image tools, | |
84 | * but I guess I'll find out soon. | |
85 | */ | |
86 | .data | |
87 | .globl version_string | |
88 | version_string: | |
89 | .ascii U_BOOT_VERSION | |
90 | .ascii " (", __DATE__, " - ", __TIME__, ")" | |
91 | .ascii " ", CONFIG_IDENT_STRING, "\0" | |
92 | ||
93 | .text | |
94 | #define _HRCW_TABLE_ENTRY(w) \ | |
95 | .fill 8,1,(((w)>>24)&0xff); \ | |
96 | .fill 8,1,(((w)>>16)&0xff); \ | |
97 | .fill 8,1,(((w)>> 8)&0xff); \ | |
98 | .fill 8,1,(((w) )&0xff) | |
99 | ||
100 | _HRCW_TABLE_ENTRY(CFG_HRCW_LOW) | |
101 | _HRCW_TABLE_ENTRY(CFG_HRCW_HIGH) | |
102 | ||
103 | ||
104 | ||
105 | #ifndef CONFIG_DEFAULT_IMMR | |
106 | #error CONFIG_DEFAULT_IMMR must be defined | |
107 | #endif /* CFG_DEFAULT_IMMR */ | |
108 | #ifndef CFG_IMMRBAR | |
109 | #define CFG_IMMRBAR CONFIG_DEFAULT_IMMR | |
110 | #endif /* CFG_IMMRBAR */ | |
111 | ||
112 | /* | |
113 | * After configuration, a system reset exception is executed using the | |
114 | * vector at offset 0x100 relative to the base set by MSR[IP]. If | |
115 | * MSR[IP] is 0, the base address is 0x00000000. If MSR[IP] is 1, the | |
116 | * base address is 0xfff00000. In the case of a Power On Reset or Hard | |
117 | * Reset, the value of MSR[IP] is determined by the CIP field in the | |
118 | * HRCW. | |
119 | * | |
120 | * Other bits in the HRCW set up the Base Address and Port Size in BR0. | |
121 | * This determines the location of the boot ROM (flash or EPROM) in the | |
122 | * processor's address space at boot time. As long as the HRCW is set up | |
123 | * so that we eventually end up executing the code below when the | |
124 | * processor executes the reset exception, the actual values used should | |
125 | * not matter. | |
126 | * | |
127 | * Once we have got here, the address mask in OR0 is cleared so that the | |
128 | * bottom 32K of the boot ROM is effectively repeated all throughout the | |
129 | * processor's address space, after which we can jump to the absolute | |
130 | * address at which the boot ROM was linked at compile time, and proceed | |
131 | * to initialise the memory controller without worrying if the rug will | |
132 | * be pulled out from under us, so to speak (it will be fine as long as | |
133 | * we configure BR0 with the same boot ROM link address). | |
134 | */ | |
135 | . = EXC_OFF_SYS_RESET | |
136 | ||
137 | .globl _start | |
138 | _start: /* time t 0 */ | |
139 | li r21, BOOTFLAG_COLD /* Normal Power-On: Boot from FLASH*/ | |
140 | nop | |
141 | b boot_cold | |
142 | ||
143 | . = EXC_OFF_SYS_RESET + 0x10 | |
144 | ||
145 | .globl _start_warm | |
146 | _start_warm: | |
147 | li r21, BOOTFLAG_WARM /* Software reboot */ | |
148 | b boot_warm | |
149 | ||
150 | ||
151 | boot_cold: /* time t 3 */ | |
152 | lis r4, CONFIG_DEFAULT_IMMR@h | |
153 | nop | |
154 | boot_warm: /* time t 5 */ | |
155 | mfmsr r5 /* save msr contents */ | |
156 | lis r3, CFG_IMMRBAR@h | |
157 | ori r3, r3, CFG_IMMRBAR@l | |
158 | stw r3, IMMRBAR(r4) | |
159 | ||
160 | /* Initialise the E300 processor core */ | |
161 | /*------------------------------------------*/ | |
162 | ||
163 | bl init_e300_core | |
164 | ||
165 | #ifndef CFG_RAMBOOT | |
166 | ||
167 | /* Inflate flash location so it appears everywhere, calculate */ | |
168 | /* the absolute address in final location of the FLASH, jump */ | |
169 | /* there and deflate the flash size back to minimal size */ | |
170 | /*------------------------------------------------------------*/ | |
171 | bl map_flash_by_law1 | |
172 | lis r4, (CFG_MONITOR_BASE)@h | |
173 | ori r4, r4, (CFG_MONITOR_BASE)@l | |
174 | addi r5, r4, in_flash - _start + EXC_OFF_SYS_RESET | |
175 | mtlr r5 | |
176 | blr | |
177 | in_flash: | |
178 | #if 1 /* Remapping flash with LAW0. */ | |
179 | bl remap_flash_by_law0 | |
180 | #endif | |
181 | #endif /* CFG_RAMBOOT */ | |
182 | ||
183 | bl setup_stack_in_data_cache_on_r1 | |
184 | ||
185 | /* let the C-code set up the rest */ | |
186 | /* */ | |
187 | /* Be careful to keep code relocatable & stack humble */ | |
188 | /*------------------------------------------------------*/ | |
189 | ||
190 | GET_GOT /* initialize GOT access */ | |
191 | ||
192 | /* r3: IMMR */ | |
193 | lis r3, CFG_IMMRBAR@h | |
194 | /* run low-level CPU init code (in Flash)*/ | |
195 | bl cpu_init_f | |
196 | ||
197 | /* r3: BOOTFLAG */ | |
198 | mr r3, r21 | |
199 | /* run 1st part of board init code (in Flash)*/ | |
200 | bl board_init_f | |
201 | ||
202 | /* | |
203 | * Vector Table | |
204 | */ | |
205 | ||
206 | .globl _start_of_vectors | |
207 | _start_of_vectors: | |
208 | ||
209 | /* Machine check */ | |
210 | STD_EXCEPTION(0x200, MachineCheck, MachineCheckException) | |
211 | ||
212 | /* Data Storage exception. */ | |
213 | STD_EXCEPTION(0x300, DataStorage, UnknownException) | |
214 | ||
215 | /* Instruction Storage exception. */ | |
216 | STD_EXCEPTION(0x400, InstStorage, UnknownException) | |
217 | ||
218 | /* External Interrupt exception. */ | |
219 | #ifndef FIXME | |
220 | STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt) | |
221 | #endif | |
222 | ||
223 | /* Alignment exception. */ | |
224 | . = 0x600 | |
225 | Alignment: | |
226 | EXCEPTION_PROLOG | |
227 | mfspr r4,DAR | |
228 | stw r4,_DAR(r21) | |
229 | mfspr r5,DSISR | |
230 | stw r5,_DSISR(r21) | |
231 | addi r3,r1,STACK_FRAME_OVERHEAD | |
232 | li r20,MSR_KERNEL | |
233 | rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */ | |
234 | rlwimi r20,r23,0,25,25 /* copy IP bit from saved MSR */ | |
235 | lwz r6,GOT(transfer_to_handler) | |
236 | mtlr r6 | |
237 | blrl | |
238 | .L_Alignment: | |
239 | .long AlignmentException - _start + EXC_OFF_SYS_RESET | |
240 | .long int_return - _start + EXC_OFF_SYS_RESET | |
241 | ||
242 | /* Program check exception */ | |
243 | . = 0x700 | |
244 | ProgramCheck: | |
245 | EXCEPTION_PROLOG | |
246 | addi r3,r1,STACK_FRAME_OVERHEAD | |
247 | li r20,MSR_KERNEL | |
248 | rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */ | |
249 | rlwimi r20,r23,0,25,25 /* copy IP bit from saved MSR */ | |
250 | lwz r6,GOT(transfer_to_handler) | |
251 | mtlr r6 | |
252 | blrl | |
253 | .L_ProgramCheck: | |
254 | .long ProgramCheckException - _start + EXC_OFF_SYS_RESET | |
255 | .long int_return - _start + EXC_OFF_SYS_RESET | |
256 | ||
257 | STD_EXCEPTION(0x800, FPUnavailable, UnknownException) | |
258 | ||
259 | /* I guess we could implement decrementer, and may have | |
260 | * to someday for timekeeping. | |
261 | */ | |
262 | STD_EXCEPTION(0x900, Decrementer, timer_interrupt) | |
263 | ||
264 | STD_EXCEPTION(0xa00, Trap_0a, UnknownException) | |
265 | STD_EXCEPTION(0xb00, Trap_0b, UnknownException) | |
266 | STD_EXCEPTION(0xc00, SystemCall, UnknownException) | |
267 | STD_EXCEPTION(0xd00, SingleStep, UnknownException) | |
268 | ||
269 | STD_EXCEPTION(0xe00, Trap_0e, UnknownException) | |
270 | STD_EXCEPTION(0xf00, Trap_0f, UnknownException) | |
271 | ||
272 | STD_EXCEPTION(0x1000, InstructionTLBMiss, UnknownException) | |
273 | STD_EXCEPTION(0x1100, DataLoadTLBMiss, UnknownException) | |
274 | STD_EXCEPTION(0x1200, DataStoreTLBMiss, UnknownException) | |
275 | #ifdef DEBUG | |
276 | . = 0x1300 | |
277 | /* | |
278 | * This exception occurs when the program counter matches the | |
279 | * Instruction Address Breakpoint Register (IABR). | |
280 | * | |
281 | * I want the cpu to halt if this occurs so I can hunt around | |
282 | * with the debugger and look at things. | |
283 | * | |
284 | * When DEBUG is defined, both machine check enable (in the MSR) | |
285 | * and checkstop reset enable (in the reset mode register) are | |
286 | * turned off and so a checkstop condition will result in the cpu | |
287 | * halting. | |
288 | * | |
289 | * I force the cpu into a checkstop condition by putting an illegal | |
290 | * instruction here (at least this is the theory). | |
291 | * | |
292 | * well - that didnt work, so just do an infinite loop! | |
293 | */ | |
294 | 1: b 1b | |
295 | #else | |
296 | STD_EXCEPTION(0x1300, InstructionBreakpoint, DebugException) | |
297 | #endif | |
298 | STD_EXCEPTION(0x1400, SMI, UnknownException) | |
299 | ||
300 | STD_EXCEPTION(0x1500, Trap_15, UnknownException) | |
301 | STD_EXCEPTION(0x1600, Trap_16, UnknownException) | |
302 | STD_EXCEPTION(0x1700, Trap_17, UnknownException) | |
303 | STD_EXCEPTION(0x1800, Trap_18, UnknownException) | |
304 | STD_EXCEPTION(0x1900, Trap_19, UnknownException) | |
305 | STD_EXCEPTION(0x1a00, Trap_1a, UnknownException) | |
306 | STD_EXCEPTION(0x1b00, Trap_1b, UnknownException) | |
307 | STD_EXCEPTION(0x1c00, Trap_1c, UnknownException) | |
308 | STD_EXCEPTION(0x1d00, Trap_1d, UnknownException) | |
309 | STD_EXCEPTION(0x1e00, Trap_1e, UnknownException) | |
310 | STD_EXCEPTION(0x1f00, Trap_1f, UnknownException) | |
311 | STD_EXCEPTION(0x2000, Trap_20, UnknownException) | |
312 | STD_EXCEPTION(0x2100, Trap_21, UnknownException) | |
313 | STD_EXCEPTION(0x2200, Trap_22, UnknownException) | |
314 | STD_EXCEPTION(0x2300, Trap_23, UnknownException) | |
315 | STD_EXCEPTION(0x2400, Trap_24, UnknownException) | |
316 | STD_EXCEPTION(0x2500, Trap_25, UnknownException) | |
317 | STD_EXCEPTION(0x2600, Trap_26, UnknownException) | |
318 | STD_EXCEPTION(0x2700, Trap_27, UnknownException) | |
319 | STD_EXCEPTION(0x2800, Trap_28, UnknownException) | |
320 | STD_EXCEPTION(0x2900, Trap_29, UnknownException) | |
321 | STD_EXCEPTION(0x2a00, Trap_2a, UnknownException) | |
322 | STD_EXCEPTION(0x2b00, Trap_2b, UnknownException) | |
323 | STD_EXCEPTION(0x2c00, Trap_2c, UnknownException) | |
324 | STD_EXCEPTION(0x2d00, Trap_2d, UnknownException) | |
325 | STD_EXCEPTION(0x2e00, Trap_2e, UnknownException) | |
326 | STD_EXCEPTION(0x2f00, Trap_2f, UnknownException) | |
327 | ||
328 | ||
329 | .globl _end_of_vectors | |
330 | _end_of_vectors: | |
331 | ||
332 | . = 0x3000 | |
333 | ||
334 | /* | |
335 | * This code finishes saving the registers to the exception frame | |
336 | * and jumps to the appropriate handler for the exception. | |
337 | * Register r21 is pointer into trap frame, r1 has new stack pointer. | |
338 | */ | |
339 | .globl transfer_to_handler | |
340 | transfer_to_handler: | |
341 | stw r22,_NIP(r21) | |
342 | lis r22,MSR_POW@h | |
343 | andc r23,r23,r22 | |
344 | stw r23,_MSR(r21) | |
345 | SAVE_GPR(7, r21) | |
346 | SAVE_4GPRS(8, r21) | |
347 | SAVE_8GPRS(12, r21) | |
348 | SAVE_8GPRS(24, r21) | |
349 | mflr r23 | |
350 | andi. r24,r23,0x3f00 /* get vector offset */ | |
351 | stw r24,TRAP(r21) | |
352 | li r22,0 | |
353 | stw r22,RESULT(r21) | |
354 | lwz r24,0(r23) /* virtual address of handler */ | |
355 | lwz r23,4(r23) /* where to go when done */ | |
356 | mtspr SRR0,r24 | |
357 | mtspr SRR1,r20 | |
358 | mtlr r23 | |
359 | SYNC | |
360 | rfi /* jump to handler, enable MMU */ | |
361 | ||
362 | int_return: | |
363 | mfmsr r28 /* Disable interrupts */ | |
364 | li r4,0 | |
365 | ori r4,r4,MSR_EE | |
366 | andc r28,r28,r4 | |
367 | SYNC /* Some chip revs need this... */ | |
368 | mtmsr r28 | |
369 | SYNC | |
370 | lwz r2,_CTR(r1) | |
371 | lwz r0,_LINK(r1) | |
372 | mtctr r2 | |
373 | mtlr r0 | |
374 | lwz r2,_XER(r1) | |
375 | lwz r0,_CCR(r1) | |
376 | mtspr XER,r2 | |
377 | mtcrf 0xFF,r0 | |
378 | REST_10GPRS(3, r1) | |
379 | REST_10GPRS(13, r1) | |
380 | REST_8GPRS(23, r1) | |
381 | REST_GPR(31, r1) | |
382 | lwz r2,_NIP(r1) /* Restore environment */ | |
383 | lwz r0,_MSR(r1) | |
384 | mtspr SRR0,r2 | |
385 | mtspr SRR1,r0 | |
386 | lwz r0,GPR0(r1) | |
387 | lwz r2,GPR2(r1) | |
388 | lwz r1,GPR1(r1) | |
389 | SYNC | |
390 | rfi | |
391 | ||
392 | /* | |
393 | * This code initialises the E300 processor core | |
394 | * (conforms to PowerPC 603e spec) | |
395 | * Note: expects original MSR contents to be in r5. | |
396 | */ | |
397 | .globl init_e300_core | |
398 | init_e300_core: /* time t 10 */ | |
399 | /* Initialize machine status; enable machine check interrupt */ | |
400 | /*-----------------------------------------------------------*/ | |
401 | ||
402 | li r3, MSR_KERNEL /* Set ME and RI flags */ | |
403 | rlwimi r3, r5, 0, 25, 25 /* preserve IP bit set by HRCW */ | |
404 | #ifdef DEBUG | |
405 | rlwimi r3, r5, 0, 21, 22 /* debugger might set SE & BE bits */ | |
406 | #endif | |
407 | SYNC /* Some chip revs need this... */ | |
408 | mtmsr r3 | |
409 | SYNC | |
410 | mtspr SRR1, r3 /* Make SRR1 match MSR */ | |
411 | ||
412 | ||
413 | lis r3, CFG_IMMRBAR@h | |
414 | #if defined(CONFIG_WATCHDOG) | |
415 | /* Initialise the Wathcdog values and reset it (if req) */ | |
416 | /*------------------------------------------------------*/ | |
417 | lis r4, CFG_WATCHDOG_VALUE | |
418 | ori r4, r4, (SWCRR_SWEN | SWCRR_SWRI | SWCRR_SWPR) | |
419 | stw r4, SWCRR(r3) | |
420 | ||
421 | /* and reset it */ | |
422 | ||
423 | li r4, 0x556C | |
424 | sth r4, SWSRR@l(r3) | |
425 | li r4, 0xAA39 | |
426 | sth r4, SWSRR@l(r3) | |
427 | #else | |
428 | /* Disable Wathcdog */ | |
429 | /*-------------------*/ | |
430 | xor r4, r4, r4 | |
431 | stw r4, SWCRR(r3) | |
432 | #endif /* CONFIG_WATCHDOG */ | |
433 | ||
434 | /* Initialize the Hardware Implementation-dependent Registers */ | |
435 | /* HID0 also contains cache control */ | |
436 | /*------------------------------------------------------*/ | |
437 | ||
438 | lis r3, CFG_HID0_INIT@h | |
439 | ori r3, r3, CFG_HID0_INIT@l | |
440 | SYNC | |
441 | mtspr HID0, r3 | |
442 | ||
443 | lis r3, CFG_HID0_FINAL@h | |
444 | ori r3, r3, CFG_HID0_FINAL@l | |
445 | SYNC | |
446 | mtspr HID0, r3 | |
447 | ||
448 | lis r3, CFG_HID2@h | |
449 | ori r3, r3, CFG_HID2@l | |
450 | SYNC | |
451 | mtspr HID2, r3 | |
452 | ||
453 | /* clear all BAT's */ | |
454 | /*----------------------------------*/ | |
455 | ||
456 | xor r0, r0, r0 | |
457 | mtspr DBAT0U, r0 | |
458 | mtspr DBAT0L, r0 | |
459 | mtspr DBAT1U, r0 | |
460 | mtspr DBAT1L, r0 | |
461 | mtspr DBAT2U, r0 | |
462 | mtspr DBAT2L, r0 | |
463 | mtspr DBAT3U, r0 | |
464 | mtspr DBAT3L, r0 | |
465 | mtspr IBAT0U, r0 | |
466 | mtspr IBAT0L, r0 | |
467 | mtspr IBAT1U, r0 | |
468 | mtspr IBAT1L, r0 | |
469 | mtspr IBAT2U, r0 | |
470 | mtspr IBAT2L, r0 | |
471 | mtspr IBAT3U, r0 | |
472 | mtspr IBAT3L, r0 | |
473 | SYNC | |
474 | ||
475 | /* invalidate all tlb's | |
476 | * | |
477 | * From the 603e User Manual: "The 603e provides the ability to | |
478 | * invalidate a TLB entry. The TLB Invalidate Entry (tlbie) | |
479 | * instruction invalidates the TLB entry indexed by the EA, and | |
480 | * operates on both the instruction and data TLBs simultaneously | |
481 | * invalidating four TLB entries (both sets in each TLB). The | |
482 | * index corresponds to bits 15-19 of the EA. To invalidate all | |
483 | * entries within both TLBs, 32 tlbie instructions should be | |
484 | * issued, incrementing this field by one each time." | |
485 | * | |
486 | * "Note that the tlbia instruction is not implemented on the | |
487 | * 603e." | |
488 | * | |
489 | * bits 15-19 correspond to addresses 0x00000000 to 0x0001F000 | |
490 | * incrementing by 0x1000 each time. The code below is sort of | |
491 | * based on code in "flush_tlbs" from arch/ppc/kernel/head.S | |
492 | * | |
493 | */ | |
494 | ||
495 | li r3, 32 | |
496 | mtctr r3 | |
497 | li r3, 0 | |
498 | 1: tlbie r3 | |
499 | addi r3, r3, 0x1000 | |
500 | bdnz 1b | |
501 | SYNC | |
502 | ||
503 | /* Done! */ | |
504 | /*------------------------------*/ | |
505 | blr | |
506 | ||
507 | /* Cache functions. | |
508 | * | |
509 | * Note: requires that all cache bits in | |
510 | * HID0 are in the low half word. | |
511 | */ | |
512 | .globl icache_enable | |
513 | icache_enable: | |
514 | mfspr r3, HID0 | |
515 | ori r3, r3, HID0_ICE | |
516 | lis r4, 0 | |
517 | ori r4, r4, HID0_ILOCK | |
518 | andc r3, r3, r4 | |
519 | ori r4, r3, HID0_ICFI | |
520 | isync | |
521 | mtspr HID0, r4 /* sets enable and invalidate, clears lock */ | |
522 | isync | |
523 | mtspr HID0, r3 /* clears invalidate */ | |
524 | blr | |
525 | ||
526 | .globl icache_disable | |
527 | icache_disable: | |
528 | mfspr r3, HID0 | |
529 | lis r4, 0 | |
530 | ori r4, r4, HID0_ICE|HID0_ILOCK | |
531 | andc r3, r3, r4 | |
532 | ori r4, r3, HID0_ICFI | |
533 | isync | |
534 | mtspr HID0, r4 /* sets invalidate, clears enable and lock*/ | |
535 | isync | |
536 | mtspr HID0, r3 /* clears invalidate */ | |
537 | blr | |
538 | ||
539 | .globl icache_status | |
540 | icache_status: | |
541 | mfspr r3, HID0 | |
542 | rlwinm r3, r3, HID0_ICE_SHIFT, 31, 31 | |
543 | blr | |
544 | ||
545 | .globl dcache_enable | |
546 | dcache_enable: | |
547 | mfspr r3, HID0 | |
548 | ori r3, r3, HID0_ENABLE_DATA_CACHE | |
549 | lis r4, 0 | |
550 | ori r4, r4, HID0_LOCK_DATA_CACHE | |
551 | andc r3, r3, r4 | |
552 | ori r4, r3, HID0_LOCK_INSTRUCTION_CACHE | |
553 | sync | |
554 | mtspr HID0, r4 /* sets enable and invalidate, clears lock */ | |
555 | sync | |
556 | mtspr HID0, r3 /* clears invalidate */ | |
557 | blr | |
558 | ||
559 | .globl dcache_disable | |
560 | dcache_disable: | |
561 | mfspr r3, HID0 | |
562 | lis r4, 0 | |
563 | ori r4, r4, HID0_ENABLE_DATA_CACHE|HID0_LOCK_DATA_CACHE | |
564 | andc r3, r3, r4 | |
565 | ori r4, r3, HID0_INVALIDATE_DATA_CACHE | |
566 | sync | |
567 | mtspr HID0, r4 /* sets invalidate, clears enable and lock */ | |
568 | sync | |
569 | mtspr HID0, r3 /* clears invalidate */ | |
570 | blr | |
571 | ||
572 | .globl dcache_status | |
573 | dcache_status: | |
574 | mfspr r3, HID0 | |
575 | rlwinm r3, r3, HID0_DCE_SHIFT, 31, 31 | |
576 | blr | |
577 | ||
578 | .globl get_pvr | |
579 | get_pvr: | |
580 | mfspr r3, PVR | |
581 | blr | |
582 | ||
583 | /*-------------------------------------------------------------------*/ | |
584 | ||
585 | /* | |
586 | * void relocate_code (addr_sp, gd, addr_moni) | |
587 | * | |
588 | * This "function" does not return, instead it continues in RAM | |
589 | * after relocating the monitor code. | |
590 | * | |
591 | * r3 = dest | |
592 | * r4 = src | |
593 | * r5 = length in bytes | |
594 | * r6 = cachelinesize | |
595 | */ | |
596 | .globl relocate_code | |
597 | relocate_code: | |
598 | mr r1, r3 /* Set new stack pointer */ | |
599 | mr r9, r4 /* Save copy of Global Data pointer */ | |
600 | mr r10, r5 /* Save copy of Destination Address */ | |
601 | ||
602 | mr r3, r5 /* Destination Address */ | |
603 | lis r4, CFG_MONITOR_BASE@h /* Source Address */ | |
604 | ori r4, r4, CFG_MONITOR_BASE@l | |
605 | lwz r5, GOT(__init_end) | |
606 | sub r5, r5, r4 | |
607 | li r6, CFG_CACHELINE_SIZE /* Cache Line Size */ | |
608 | ||
609 | /* | |
610 | * Fix GOT pointer: | |
611 | * | |
612 | * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) | |
613 | * + Destination Address | |
614 | * | |
615 | * Offset: | |
616 | */ | |
617 | sub r15, r10, r4 | |
618 | ||
619 | /* First our own GOT */ | |
620 | add r14, r14, r15 | |
621 | /* then the one used by the C code */ | |
622 | add r30, r30, r15 | |
623 | ||
624 | /* | |
625 | * Now relocate code | |
626 | */ | |
627 | ||
628 | cmplw cr1,r3,r4 | |
629 | addi r0,r5,3 | |
630 | srwi. r0,r0,2 | |
631 | beq cr1,4f /* In place copy is not necessary */ | |
632 | beq 7f /* Protect against 0 count */ | |
633 | mtctr r0 | |
634 | bge cr1,2f | |
635 | la r8,-4(r4) | |
636 | la r7,-4(r3) | |
637 | ||
638 | /* copy */ | |
639 | 1: lwzu r0,4(r8) | |
640 | stwu r0,4(r7) | |
641 | bdnz 1b | |
642 | ||
643 | addi r0,r5,3 | |
644 | srwi. r0,r0,2 | |
645 | mtctr r0 | |
646 | la r8,-4(r4) | |
647 | la r7,-4(r3) | |
648 | ||
649 | /* and compare */ | |
650 | 20: lwzu r20,4(r8) | |
651 | lwzu r21,4(r7) | |
652 | xor. r22, r20, r21 | |
653 | bne 30f | |
654 | bdnz 20b | |
655 | b 4f | |
656 | ||
657 | /* compare failed */ | |
658 | 30: li r3, 0 | |
659 | blr | |
660 | ||
661 | 2: slwi r0,r0,2 /* re copy in reverse order ... y do we needed it? */ | |
662 | add r8,r4,r0 | |
663 | add r7,r3,r0 | |
664 | 3: lwzu r0,-4(r8) | |
665 | stwu r0,-4(r7) | |
666 | bdnz 3b | |
667 | ||
668 | ||
669 | ||
670 | /* | |
671 | * Now flush the cache: note that we must start from a cache aligned | |
672 | * address. Otherwise we might miss one cache line. | |
673 | */ | |
674 | 4: | |
675 | bl un_setup_stack_in_data_cache | |
676 | mr r7, r3 | |
677 | mr r8, r4 | |
678 | bl dcache_disable | |
679 | mr r3, r7 | |
680 | mr r4, r8 | |
681 | ||
682 | cmpwi r6,0 | |
683 | add r5,r3,r5 | |
684 | beq 7f /* Always flush prefetch queue in any case */ | |
685 | subi r0,r6,1 | |
686 | andc r3,r3,r0 | |
687 | mfspr r7,HID0 /* don't do dcbst if dcache is disabled*/ | |
688 | rlwinm r7,r7,HID0_DCE_SHIFT,31,31 | |
689 | cmpwi r7,0 | |
690 | beq 9f | |
691 | mr r4,r3 | |
692 | 5: dcbst 0,r4 | |
693 | add r4,r4,r6 | |
694 | cmplw r4,r5 | |
695 | blt 5b | |
696 | sync /* Wait for all dcbst to complete on bus */ | |
697 | 9: mfspr r7,HID0 /* don't do icbi if icache is disabled */ | |
698 | rlwinm r7,r7,HID0_DCE_SHIFT,31,31 | |
699 | cmpwi r7,0 | |
700 | beq 7f | |
701 | mr r4,r3 | |
702 | 6: icbi 0,r4 | |
703 | add r4,r4,r6 | |
704 | cmplw r4,r5 | |
705 | blt 6b | |
706 | 7: sync /* Wait for all icbi to complete on bus */ | |
707 | isync | |
708 | ||
709 | /* | |
710 | * We are done. Do not return, instead branch to second part of board | |
711 | * initialization, now running from RAM. | |
712 | */ | |
713 | ||
714 | addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET | |
715 | mtlr r0 | |
716 | blr | |
717 | ||
718 | in_ram: | |
719 | ||
720 | /* | |
721 | * Relocation Function, r14 point to got2+0x8000 | |
722 | * | |
723 | * Adjust got2 pointers, no need to check for 0, this code | |
724 | * already puts a few entries in the table. | |
725 | */ | |
726 | li r0,__got2_entries@sectoff@l | |
727 | la r3,GOT(_GOT2_TABLE_) | |
728 | lwz r11,GOT(_GOT2_TABLE_) | |
729 | mtctr r0 | |
730 | sub r11,r3,r11 | |
731 | addi r3,r3,-4 | |
732 | 1: lwzu r0,4(r3) | |
733 | add r0,r0,r11 | |
734 | stw r0,0(r3) | |
735 | bdnz 1b | |
736 | ||
737 | /* | |
738 | * Now adjust the fixups and the pointers to the fixups | |
739 | * in case we need to move ourselves again. | |
740 | */ | |
741 | 2: li r0,__fixup_entries@sectoff@l | |
742 | lwz r3,GOT(_FIXUP_TABLE_) | |
743 | cmpwi r0,0 | |
744 | mtctr r0 | |
745 | addi r3,r3,-4 | |
746 | beq 4f | |
747 | 3: lwzu r4,4(r3) | |
748 | lwzux r0,r4,r11 | |
749 | add r0,r0,r11 | |
750 | stw r10,0(r3) | |
751 | stw r0,0(r4) | |
752 | bdnz 3b | |
753 | 4: | |
754 | clear_bss: | |
755 | /* | |
756 | * Now clear BSS segment | |
757 | */ | |
758 | lwz r3,GOT(__bss_start) | |
759 | #if defined(CONFIG_HYMOD) | |
760 | /* | |
761 | * For HYMOD - the environment is the very last item in flash. | |
762 | * The real .bss stops just before environment starts, so only | |
763 | * clear up to that point. | |
764 | * | |
765 | * taken from mods for FADS board | |
766 | */ | |
767 | lwz r4,GOT(environment) | |
768 | #else | |
769 | lwz r4,GOT(_end) | |
770 | #endif | |
771 | ||
772 | cmplw 0, r3, r4 | |
773 | beq 6f | |
774 | ||
775 | li r0, 0 | |
776 | 5: | |
777 | stw r0, 0(r3) | |
778 | addi r3, r3, 4 | |
779 | cmplw 0, r3, r4 | |
780 | bne 5b | |
781 | 6: | |
782 | ||
783 | mr r3, r9 /* Global Data pointer */ | |
784 | mr r4, r10 /* Destination Address */ | |
785 | bl board_init_r | |
786 | ||
787 | /* | |
788 | * Copy exception vector code to low memory | |
789 | * | |
790 | * r3: dest_addr | |
791 | * r7: source address, r8: end address, r9: target address | |
792 | */ | |
793 | .globl trap_init | |
794 | trap_init: | |
795 | lwz r7, GOT(_start) | |
796 | lwz r8, GOT(_end_of_vectors) | |
797 | ||
798 | li r9, 0x100 /* reset vector always at 0x100 */ | |
799 | ||
800 | cmplw 0, r7, r8 | |
801 | bgelr /* return if r7>=r8 - just in case */ | |
802 | ||
803 | mflr r4 /* save link register */ | |
804 | 1: | |
805 | lwz r0, 0(r7) | |
806 | stw r0, 0(r9) | |
807 | addi r7, r7, 4 | |
808 | addi r9, r9, 4 | |
809 | cmplw 0, r7, r8 | |
810 | bne 1b | |
811 | ||
812 | /* | |
813 | * relocate `hdlr' and `int_return' entries | |
814 | */ | |
815 | li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET | |
816 | li r8, Alignment - _start + EXC_OFF_SYS_RESET | |
817 | 2: | |
818 | bl trap_reloc | |
819 | addi r7, r7, 0x100 /* next exception vector */ | |
820 | cmplw 0, r7, r8 | |
821 | blt 2b | |
822 | ||
823 | li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET | |
824 | bl trap_reloc | |
825 | ||
826 | li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET | |
827 | bl trap_reloc | |
828 | ||
829 | li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET | |
830 | li r8, SystemCall - _start + EXC_OFF_SYS_RESET | |
831 | 3: | |
832 | bl trap_reloc | |
833 | addi r7, r7, 0x100 /* next exception vector */ | |
834 | cmplw 0, r7, r8 | |
835 | blt 3b | |
836 | ||
837 | li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET | |
838 | li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET | |
839 | 4: | |
840 | bl trap_reloc | |
841 | addi r7, r7, 0x100 /* next exception vector */ | |
842 | cmplw 0, r7, r8 | |
843 | blt 4b | |
844 | ||
845 | mfmsr r3 /* now that the vectors have */ | |
846 | lis r7, MSR_IP@h /* relocated into low memory */ | |
847 | ori r7, r7, MSR_IP@l /* MSR[IP] can be turned off */ | |
848 | andc r3, r3, r7 /* (if it was on) */ | |
849 | SYNC /* Some chip revs need this... */ | |
850 | mtmsr r3 | |
851 | SYNC | |
852 | ||
853 | mtlr r4 /* restore link register */ | |
854 | blr | |
855 | ||
856 | /* | |
857 | * Function: relocate entries for one exception vector | |
858 | */ | |
859 | trap_reloc: | |
860 | lwz r0, 0(r7) /* hdlr ... */ | |
861 | add r0, r0, r3 /* ... += dest_addr */ | |
862 | stw r0, 0(r7) | |
863 | ||
864 | lwz r0, 4(r7) /* int_return ... */ | |
865 | add r0, r0, r3 /* ... += dest_addr */ | |
866 | stw r0, 4(r7) | |
867 | ||
868 | blr | |
869 | ||
870 | #ifdef CFG_INIT_RAM_LOCK | |
871 | .globl unlock_ram_in_cache | |
872 | unlock_ram_in_cache: | |
873 | /* invalidate the INIT_RAM section */ | |
874 | lis r3, (CFG_INIT_RAM_ADDR & ~31)@h | |
875 | ori r3, r3, (CFG_INIT_RAM_ADDR & ~31)@l | |
876 | li r2,512 | |
877 | mtctr r2 | |
878 | 1: icbi r0, r3 | |
879 | dcbi r0, r3 | |
880 | addi r3, r3, 32 | |
881 | bdnz 1b | |
882 | sync /* Wait for all icbi to complete on bus */ | |
883 | isync | |
884 | blr | |
885 | #endif | |
886 | ||
887 | map_flash_by_law1: | |
888 | /* When booting from ROM (Flash or EPROM), clear the */ | |
889 | /* Address Mask in OR0 so ROM appears everywhere */ | |
890 | /*----------------------------------------------------*/ | |
891 | lis r3, (CFG_IMMRBAR)@h /* r3 <= CFG_IMMRBAR */ | |
892 | lwz r4, OR0@l(r3) | |
893 | li r5, 0x7fff /* r5 <= 0x00007FFFF */ | |
894 | and r4, r4, r5 | |
895 | stw r4, OR0@l(r3) /* OR0 <= OR0 & 0x00007FFFF */ | |
896 | ||
897 | /* As MPC8349E User's Manual presented, when RCW[BMS] is set to 0, | |
898 | * system will boot from 0x0000_0100, and the LBLAWBAR0[BASE_ADDR] | |
899 | * reset value is 0x00000; when RCW[BMS] is set to 1, system will boot | |
900 | * from 0xFFF0_0100, and the LBLAWBAR0[BASE_ADDR] reset value is | |
901 | * 0xFF800. From the hard resetting to here, the processor fetched and | |
902 | * executed the instructions one by one. There is not absolutely | |
903 | * jumping happened. Laterly, the u-boot code has to do an absolutely | |
904 | * jumping to tell the CPU instruction fetching component what the | |
905 | * u-boot TEXT base address is. Because the TEXT base resides in the | |
906 | * boot ROM memory space, to garantee the code can run smoothly after | |
907 | * that jumping, we must map in the entire boot ROM by Local Access | |
908 | * Window. Sometimes, we desire an non-0x00000 or non-0xFF800 starting | |
909 | * address for boot ROM, such as 0xFE000000. In this case, the default | |
910 | * LBIU Local Access Widow 0 will not cover this memory space. So, we | |
911 | * need another window to map in it. | |
912 | */ | |
913 | lis r4, (CFG_FLASH_BASE)@h | |
914 | ori r4, r4, (CFG_FLASH_BASE)@l | |
915 | stw r4, LBLAWBAR1(r3) /* LBLAWBAR1 <= CFG_FLASH_BASE */ | |
916 | lis r4, (0x80000016)@h | |
917 | ori r4, r4, (0x80000016)@l | |
918 | stw r4, LBLAWAR1(r3) /* LBLAWAR1 <= 8MB Flash Size */ | |
919 | blr | |
920 | ||
921 | /* Though all the LBIU Local Access Windows and LBC Banks will be | |
922 | * initialized in the C code, we'd better configure boot ROM's | |
923 | * window 0 and bank 0 correctly at here. | |
924 | */ | |
925 | remap_flash_by_law0: | |
926 | /* Initialize the BR0 with the boot ROM starting address. */ | |
927 | lwz r4, BR0(r3) | |
928 | li r5, 0x7FFF | |
929 | and r4, r4, r5 | |
930 | lis r5, (CFG_FLASH_BASE & 0xFFFF8000)@h | |
931 | ori r5, r5, (CFG_FLASH_BASE & 0xFFFF8000)@l | |
932 | or r5, r5, r4 | |
933 | stw r5, BR0(r3) /* r5 <= (CFG_FLASH_BASE & 0xFFFF8000) | (BR0 & 0x00007FFF) */ | |
934 | ||
935 | lwz r4, OR0(r3) | |
936 | lis r5, 0xFF80 /* 8M */ | |
937 | or r4, r4, r5 | |
938 | stw r4, OR0(r3) /* OR0 <= OR0 | 0xFF800000 */ | |
939 | ||
940 | lis r4, (CFG_FLASH_BASE)@h | |
941 | ori r4, r4, (CFG_FLASH_BASE)@l | |
942 | stw r4, LBLAWBAR0(r3) /* LBLAWBAR0 <= CFG_FLASH_BASE */ | |
943 | ||
944 | lis r4, (0x80000016)@h | |
945 | ori r4, r4, (0x80000016)@l | |
946 | stw r4, LBLAWAR0(r3) /* LBLAWAR0 <= 8MB Flash Size */ | |
947 | ||
948 | xor r4, r4, r4 | |
949 | stw r4, LBLAWBAR1(r3) | |
950 | stw r4, LBLAWAR1(r3) /* Off LBIU LAW1 */ | |
951 | blr | |
952 | ||
953 | setup_stack_in_data_cache_on_r1: | |
954 | lis r3, (CFG_IMMRBAR)@h | |
955 | ||
956 | /* setup D-BAT for the D-Cache (with out real memory backup) */ | |
957 | ||
958 | lis r4, (CFG_INIT_RAM_ADDR & 0xFFFE0000)@h | |
959 | mtspr DBAT0U, r4 | |
960 | ori r4, r4, 0x0002 | |
961 | mtspr DBAT0L, r4 | |
962 | isync | |
963 | ||
964 | #if 0 | |
965 | /* Enable MMU */ | |
966 | mfmsr r4 | |
967 | ori r4, r4, (MSR_DR | MSR_IR)@l | |
968 | mtmsr r4 | |
969 | #endif | |
970 | ||
971 | /* Enable and invalidate data cache. */ | |
972 | mfspr r4, HID0 | |
973 | mr r5, r4 | |
974 | ori r4, r4, HID0_DCE | HID0_DCI | |
975 | ori r5, r5, HID0_DCE | |
976 | sync | |
977 | mtspr HID0, r4 | |
978 | mtspr HID0, r5 | |
979 | sync | |
980 | ||
981 | /* Allocate Initial RAM in data cache.*/ | |
982 | li r0, 0 | |
983 | lis r4, (CFG_INIT_RAM_ADDR)@h | |
984 | ori r4, r4, (CFG_INIT_RAM_ADDR)@l | |
985 | li r5, 128*8 /* 128*8*32=32Kb */ | |
986 | mtctr r5 | |
987 | 1: | |
988 | dcbz r0, r4 | |
989 | addi r4, r4, 32 | |
990 | bdnz 1b | |
991 | isync | |
992 | ||
993 | /* Lock all the D-cache, basically leaving the reset of the program without dcache */ | |
994 | mfspr r4, HID0 | |
995 | ori r4, r4, (HID0_DLOCK)@l | |
996 | sync | |
997 | mtspr HID0 , r4 | |
998 | ||
999 | /* setup the stack pointer in r1 */ | |
1000 | lis r1, (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET)@h | |
1001 | ori r1, r1, (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET)@l | |
1002 | li r0, 0 /* Make room for stack frame header and */ | |
1003 | ||
1004 | stwu r0, -4(r1) /* clear final stack frame so that */ | |
1005 | stwu r0, -4(r1) /* stack backtraces terminate cleanly */ | |
1006 | ||
1007 | blr | |
1008 | ||
1009 | un_setup_stack_in_data_cache: | |
1010 | blr | |
1011 | mr r14, r4 | |
1012 | mr r15, r5 | |
1013 | ||
1014 | ||
1015 | lis r4, (CFG_INIT_RAM_ADDR & 0xFFFE0000)@h | |
1016 | mtspr DBAT0U, r4 | |
1017 | ori r4, r4, 0x0002 | |
1018 | mtspr DBAT0L, r4 | |
1019 | isync | |
1020 | ||
1021 | /* un lock all the D-cache */ | |
1022 | mfspr r4, HID0 | |
1023 | lis r5, (~(HID0_DLOCK))@h | |
1024 | ori r5, r5, (~(HID0_DLOCK))@l | |
1025 | and r4, r4, r5 | |
1026 | sync | |
1027 | mtspr HID0 , r4 | |
1028 | ||
1029 | /* Re - Allocate Initial RAM in data cache.*/ | |
1030 | li r0, 0 | |
1031 | lis r4, (CFG_INIT_RAM_ADDR)@h | |
1032 | ori r4, r4, (CFG_INIT_RAM_ADDR)@l | |
1033 | li r5, 128*8 /* 128*8*32=32Kb */ | |
1034 | mtctr r5 | |
1035 | 1: | |
1036 | dcbz r0, r4 | |
1037 | addi r4, r4, 32 | |
1038 | bdnz 1b | |
1039 | isync | |
1040 | ||
1041 | mflr r16 | |
1042 | bl dcache_disable | |
1043 | mtlr r16 | |
1044 | ||
1045 | blr | |
1046 | ||
1047 | #if 0 | |
1048 | #define GREEN_LIGHT 0x2B0D4046 | |
1049 | #define RED_LIGHT 0x250D4046 | |
1050 | #define LIB_CNT 0x4FFF | |
1051 | ||
1052 | /* | |
1053 | * Lib Light | |
1054 | */ | |
1055 | ||
1056 | .globl liblight | |
1057 | liblight: | |
1058 | lis r3, CFG_IMMRBAR@h | |
1059 | ori r3, r3, CFG_IMMRBAR@l | |
1060 | li r4, 0x3002 | |
1061 | mtmsr r4 | |
1062 | xor r4, r4, r4 | |
1063 | mtspr HID0, r4 | |
1064 | mtspr HID2, r4 | |
1065 | lis r4, 0xF8000000@h | |
1066 | ori r4, r4, 0xF8000000@l | |
1067 | stw r4, LBLAWBAR1(r3) | |
1068 | lis r4, 0x8000000E@h | |
1069 | ori r4, r4, 0x8000000E@l | |
1070 | stw r4, LBLAWAR1(r3) | |
1071 | lis r4, 0xF8000801@h | |
1072 | ori r4, r4, 0xF8000801@l | |
1073 | stw r4, BR1(r3) | |
1074 | lis r4, 0xFFFFE8f0@h | |
1075 | ori r4, r4, 0xFFFFE8f0@l | |
1076 | stw r4, OR1(r3) | |
1077 | ||
1078 | lis r4, 0xF8000000@h | |
1079 | ori r4, r4, 0xF8000000@l | |
1080 | lis r5, GREEN_LIGHT@h | |
1081 | ori r5, r5, GREEN_LIGHT@l | |
1082 | lis r6, RED_LIGHT@h | |
1083 | ori r6, r6, RED_LIGHT@l | |
1084 | lis r7, LIB_CNT@h | |
1085 | ori r7, r7, LIB_CNT@l | |
1086 | ||
1087 | 1: | |
1088 | stw r5, 0(r4) | |
1089 | mtctr r7 | |
1090 | 2: bdnz 2b | |
1091 | stw r6, 0(r4) | |
1092 | mtctr r7 | |
1093 | 3: bdnz 3b | |
1094 | b 1b | |
1095 | ||
1096 | #endif |