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wdenk945af8d2003-07-16 21:53:01 +00001/*
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 - 2003 Wolfgang Denk <wd@denx.de>
5 *
6 * See file CREDITS for list of people who contributed to this
7 * project.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22 * MA 02111-1307 USA
23 */
24
25/*
26 * U-Boot - Startup Code for MPC5xxx CPUs
27 */
28#include <config.h>
29#include <mpc5xxx.h>
30#include <version.h>
31
wdenkcbd8a352004-02-24 02:00:03 +000032#define CONFIG_MPC5xxx 1 /* needed for Linux kernel header files */
wdenk945af8d2003-07-16 21:53:01 +000033#define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
34
35#include <ppc_asm.tmpl>
36#include <ppc_defs.h>
37
38#include <asm/cache.h>
39#include <asm/mmu.h>
40
41#ifndef CONFIG_IDENT_STRING
42#define CONFIG_IDENT_STRING ""
43#endif
44
45/* We don't want the MMU yet.
46*/
47#undef MSR_KERNEL
48/* Floating Point enable, Machine Check and Recoverable Interr. */
49#ifdef DEBUG
50#define MSR_KERNEL (MSR_FP|MSR_RI)
51#else
52#define MSR_KERNEL (MSR_FP|MSR_ME|MSR_RI)
53#endif
54
55/*
56 * Set up GOT: Global Offset Table
57 *
58 * Use r14 to access the GOT
59 */
60 START_GOT
61 GOT_ENTRY(_GOT2_TABLE_)
62 GOT_ENTRY(_FIXUP_TABLE_)
63
64 GOT_ENTRY(_start)
65 GOT_ENTRY(_start_of_vectors)
66 GOT_ENTRY(_end_of_vectors)
67 GOT_ENTRY(transfer_to_handler)
68
69 GOT_ENTRY(__init_end)
70 GOT_ENTRY(_end)
71 GOT_ENTRY(__bss_start)
72 END_GOT
73
74/*
75 * Version string
76 */
77 .data
78 .globl version_string
79version_string:
80 .ascii U_BOOT_VERSION
81 .ascii " (", __DATE__, " - ", __TIME__, ")"
82 .ascii CONFIG_IDENT_STRING, "\0"
83
84/*
85 * Exception vectors
86 */
87 .text
88 . = EXC_OFF_SYS_RESET
89 .globl _start
90_start:
91 li r21, BOOTFLAG_COLD /* Normal Power-On */
92 nop
93 b boot_cold
94
95 . = EXC_OFF_SYS_RESET + 0x10
96
97 .globl _start_warm
98_start_warm:
99 li r21, BOOTFLAG_WARM /* Software reboot */
100 b boot_warm
101
102boot_cold:
103boot_warm:
104 mfmsr r5 /* save msr contents */
105
wdenke35745b2004-04-18 23:32:11 +0000106 /* Move CSBoot and adjust instruction pointer */
107 /*--------------------------------------------------------------*/
108
wdenk5cf9da42003-11-07 13:42:26 +0000109#if defined(CFG_LOWBOOT)
wdenkb98fff12004-02-09 20:51:26 +0000110#if defined(CFG_RAMBOOT)
111#error CFG_LOWBOOT is incompatible with CFG_RAMBOOT
112#endif /* CFG_RAMBOOT */
wdenk6c7a1402004-07-11 19:17:20 +0000113#if defined(CFG_LOWBOOT)
114#error CFG_LOWBOOT is incompatible with MGT5100
115#endif /* CFG_LOWBOOT */
wdenk5cf9da42003-11-07 13:42:26 +0000116 lis r4, CFG_DEFAULT_MBAR@h
wdenk79d696f2004-03-11 22:46:36 +0000117 lis r3, START_REG(CFG_BOOTCS_START)@h
118 ori r3, r3, START_REG(CFG_BOOTCS_START)@l
119 stw r3, 0x4(r4) /* CS0 start */
120 lis r3, STOP_REG(CFG_BOOTCS_START, CFG_BOOTCS_SIZE)@h
121 ori r3, r3, STOP_REG(CFG_BOOTCS_START, CFG_BOOTCS_SIZE)@l
wdenk79d696f2004-03-11 22:46:36 +0000122 stw r3, 0x8(r4) /* CS0 stop */
wdenk5cf9da42003-11-07 13:42:26 +0000123 lis r3, 0x02010000@h
124 ori r3, r3, 0x02010000@l
wdenke35745b2004-04-18 23:32:11 +0000125 stw r3, 0x54(r4) /* CS0 and Boot enable */
wdenk5cf9da42003-11-07 13:42:26 +0000126
wdenke35745b2004-04-18 23:32:11 +0000127 lis r3, lowboot_reentry@h /* jump from bootlow address space (0x0000xxxx) */
128 ori r3, r3, lowboot_reentry@l /* to the address space the linker used */
wdenk5cf9da42003-11-07 13:42:26 +0000129 mtlr r3
wdenke35745b2004-04-18 23:32:11 +0000130 blr
wdenkd4ca31c2004-01-02 14:00:00 +0000131
132lowboot_reentry:
wdenk79d696f2004-03-11 22:46:36 +0000133 lis r3, START_REG(CFG_BOOTCS_START)@h
134 ori r3, r3, START_REG(CFG_BOOTCS_START)@l
135 stw r3, 0x4c(r4) /* Boot start */
136 lis r3, STOP_REG(CFG_BOOTCS_START, CFG_BOOTCS_SIZE)@h
137 ori r3, r3, STOP_REG(CFG_BOOTCS_START, CFG_BOOTCS_SIZE)@l
138 stw r3, 0x50(r4) /* Boot stop */
wdenk5cf9da42003-11-07 13:42:26 +0000139 lis r3, 0x02000001@h
140 ori r3, r3, 0x02000001@l
wdenke35745b2004-04-18 23:32:11 +0000141 stw r3, 0x54(r4) /* Boot enable, CS0 disable */
wdenk5cf9da42003-11-07 13:42:26 +0000142#endif /* CFG_LOWBOOT */
wdenkd4ca31c2004-01-02 14:00:00 +0000143
wdenke0ac62d2003-08-17 18:55:18 +0000144#if defined(CFG_DEFAULT_MBAR) && !defined(CFG_RAMBOOT)
wdenk945af8d2003-07-16 21:53:01 +0000145 lis r3, CFG_MBAR@h
146 ori r3, r3, CFG_MBAR@l
147#if defined(CONFIG_MPC5200)
wdenk3c74e322004-02-22 23:46:08 +0000148 /* MBAR is mirrored into the MBAR SPR */
149 mtspr MBAR,r3
wdenk945af8d2003-07-16 21:53:01 +0000150 rlwinm r3, r3, 16, 16, 31
151#endif
152#if defined(CONFIG_MGT5100)
153 rlwinm r3, r3, 17, 15, 31
154#endif
155 lis r4, CFG_DEFAULT_MBAR@h
156 stw r3, 0(r4)
157#endif /* CFG_DEFAULT_MBAR */
158
159 /* Initialise the MPC5xxx processor core */
160 /*--------------------------------------------------------------*/
161
162 bl init_5xxx_core
163
164 /* initialize some things that are hard to access from C */
165 /*--------------------------------------------------------------*/
166
167 /* set up stack in on-chip SRAM */
168 lis r3, CFG_INIT_RAM_ADDR@h
169 ori r3, r3, CFG_INIT_RAM_ADDR@l
170 ori r1, r3, CFG_INIT_SP_OFFSET
171 li r0, 0 /* Make room for stack frame header and */
172 stwu r0, -4(r1) /* clear final stack frame so that */
173 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
174
175 /* let the C-code set up the rest */
176 /* */
177 /* Be careful to keep code relocatable ! */
178 /*--------------------------------------------------------------*/
179
180 GET_GOT /* initialize GOT access */
181
182 /* r3: IMMR */
183 bl cpu_init_f /* run low-level CPU init code (in Flash)*/
184
185 mr r3, r21
186 /* r3: BOOTFLAG */
187 bl board_init_f /* run 1st part of board init code (in Flash)*/
188
189/*
190 * Vector Table
191 */
192
193 .globl _start_of_vectors
194_start_of_vectors:
195
196/* Machine check */
197 STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
198
199/* Data Storage exception. */
200 STD_EXCEPTION(0x300, DataStorage, UnknownException)
201
202/* Instruction Storage exception. */
203 STD_EXCEPTION(0x400, InstStorage, UnknownException)
204
205/* External Interrupt exception. */
206 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
207
208/* Alignment exception. */
209 . = 0x600
210Alignment:
211 EXCEPTION_PROLOG
212 mfspr r4,DAR
213 stw r4,_DAR(r21)
214 mfspr r5,DSISR
215 stw r5,_DSISR(r21)
216 addi r3,r1,STACK_FRAME_OVERHEAD
217 li r20,MSR_KERNEL
218 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
219 rlwimi r20,r23,0,25,25 /* copy IP bit from saved MSR */
220 lwz r6,GOT(transfer_to_handler)
221 mtlr r6
222 blrl
223.L_Alignment:
224 .long AlignmentException - _start + EXC_OFF_SYS_RESET
225 .long int_return - _start + EXC_OFF_SYS_RESET
226
227/* Program check exception */
228 . = 0x700
229ProgramCheck:
230 EXCEPTION_PROLOG
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_ProgramCheck:
239 .long ProgramCheckException - _start + EXC_OFF_SYS_RESET
240 .long int_return - _start + EXC_OFF_SYS_RESET
241
242 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
243
244 /* I guess we could implement decrementer, and may have
245 * to someday for timekeeping.
246 */
247 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
248
249 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
250 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
wdenk27b207f2003-07-24 23:38:38 +0000251 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
wdenk945af8d2003-07-16 21:53:01 +0000252 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
253
254 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
255 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
256
257 STD_EXCEPTION(0x1000, InstructionTLBMiss, UnknownException)
258 STD_EXCEPTION(0x1100, DataLoadTLBMiss, UnknownException)
259 STD_EXCEPTION(0x1200, DataStoreTLBMiss, UnknownException)
260#ifdef DEBUG
261 . = 0x1300
262 /*
263 * This exception occurs when the program counter matches the
264 * Instruction Address Breakpoint Register (IABR).
265 *
266 * I want the cpu to halt if this occurs so I can hunt around
267 * with the debugger and look at things.
268 *
269 * When DEBUG is defined, both machine check enable (in the MSR)
270 * and checkstop reset enable (in the reset mode register) are
271 * turned off and so a checkstop condition will result in the cpu
272 * halting.
273 *
274 * I force the cpu into a checkstop condition by putting an illegal
275 * instruction here (at least this is the theory).
276 *
277 * well - that didnt work, so just do an infinite loop!
278 */
2791: b 1b
280#else
281 STD_EXCEPTION(0x1300, InstructionBreakpoint, DebugException)
282#endif
283 STD_EXCEPTION(0x1400, SMI, UnknownException)
284
285 STD_EXCEPTION(0x1500, Trap_15, UnknownException)
286 STD_EXCEPTION(0x1600, Trap_16, UnknownException)
287 STD_EXCEPTION(0x1700, Trap_17, UnknownException)
288 STD_EXCEPTION(0x1800, Trap_18, UnknownException)
289 STD_EXCEPTION(0x1900, Trap_19, UnknownException)
290 STD_EXCEPTION(0x1a00, Trap_1a, UnknownException)
291 STD_EXCEPTION(0x1b00, Trap_1b, UnknownException)
292 STD_EXCEPTION(0x1c00, Trap_1c, UnknownException)
293 STD_EXCEPTION(0x1d00, Trap_1d, UnknownException)
294 STD_EXCEPTION(0x1e00, Trap_1e, UnknownException)
295 STD_EXCEPTION(0x1f00, Trap_1f, UnknownException)
296 STD_EXCEPTION(0x2000, Trap_20, UnknownException)
297 STD_EXCEPTION(0x2100, Trap_21, UnknownException)
298 STD_EXCEPTION(0x2200, Trap_22, UnknownException)
299 STD_EXCEPTION(0x2300, Trap_23, UnknownException)
300 STD_EXCEPTION(0x2400, Trap_24, UnknownException)
301 STD_EXCEPTION(0x2500, Trap_25, UnknownException)
302 STD_EXCEPTION(0x2600, Trap_26, UnknownException)
303 STD_EXCEPTION(0x2700, Trap_27, UnknownException)
304 STD_EXCEPTION(0x2800, Trap_28, UnknownException)
305 STD_EXCEPTION(0x2900, Trap_29, UnknownException)
306 STD_EXCEPTION(0x2a00, Trap_2a, UnknownException)
307 STD_EXCEPTION(0x2b00, Trap_2b, UnknownException)
308 STD_EXCEPTION(0x2c00, Trap_2c, UnknownException)
309 STD_EXCEPTION(0x2d00, Trap_2d, UnknownException)
310 STD_EXCEPTION(0x2e00, Trap_2e, UnknownException)
311 STD_EXCEPTION(0x2f00, Trap_2f, UnknownException)
312
313
314 .globl _end_of_vectors
315_end_of_vectors:
316
317 . = 0x3000
318
319/*
320 * This code finishes saving the registers to the exception frame
321 * and jumps to the appropriate handler for the exception.
322 * Register r21 is pointer into trap frame, r1 has new stack pointer.
323 */
324 .globl transfer_to_handler
325transfer_to_handler:
326 stw r22,_NIP(r21)
327 lis r22,MSR_POW@h
328 andc r23,r23,r22
329 stw r23,_MSR(r21)
330 SAVE_GPR(7, r21)
331 SAVE_4GPRS(8, r21)
332 SAVE_8GPRS(12, r21)
333 SAVE_8GPRS(24, r21)
334 mflr r23
335 andi. r24,r23,0x3f00 /* get vector offset */
336 stw r24,TRAP(r21)
337 li r22,0
338 stw r22,RESULT(r21)
339 lwz r24,0(r23) /* virtual address of handler */
340 lwz r23,4(r23) /* where to go when done */
341 mtspr SRR0,r24
342 mtspr SRR1,r20
343 mtlr r23
344 SYNC
345 rfi /* jump to handler, enable MMU */
346
347int_return:
348 mfmsr r28 /* Disable interrupts */
349 li r4,0
350 ori r4,r4,MSR_EE
351 andc r28,r28,r4
352 SYNC /* Some chip revs need this... */
353 mtmsr r28
354 SYNC
355 lwz r2,_CTR(r1)
356 lwz r0,_LINK(r1)
357 mtctr r2
358 mtlr r0
359 lwz r2,_XER(r1)
360 lwz r0,_CCR(r1)
361 mtspr XER,r2
362 mtcrf 0xFF,r0
363 REST_10GPRS(3, r1)
364 REST_10GPRS(13, r1)
365 REST_8GPRS(23, r1)
366 REST_GPR(31, r1)
367 lwz r2,_NIP(r1) /* Restore environment */
368 lwz r0,_MSR(r1)
369 mtspr SRR0,r2
370 mtspr SRR1,r0
371 lwz r0,GPR0(r1)
372 lwz r2,GPR2(r1)
373 lwz r1,GPR1(r1)
374 SYNC
375 rfi
376
377/*
378 * This code initialises the MPC5xxx processor core
379 * (conforms to PowerPC 603e spec)
380 * Note: expects original MSR contents to be in r5.
381 */
382
383 .globl init_5xx_core
384init_5xxx_core:
385
386 /* Initialize machine status; enable machine check interrupt */
387 /*--------------------------------------------------------------*/
388
389 li r3, MSR_KERNEL /* Set ME and RI flags */
390 rlwimi r3, r5, 0, 25, 25 /* preserve IP bit set by HRCW */
391#ifdef DEBUG
392 rlwimi r3, r5, 0, 21, 22 /* debugger might set SE & BE bits */
393#endif
394 SYNC /* Some chip revs need this... */
395 mtmsr r3
396 SYNC
397 mtspr SRR1, r3 /* Make SRR1 match MSR */
398
399 /* Initialize the Hardware Implementation-dependent Registers */
400 /* HID0 also contains cache control */
401 /*--------------------------------------------------------------*/
402
403 lis r3, CFG_HID0_INIT@h
404 ori r3, r3, CFG_HID0_INIT@l
405 SYNC
406 mtspr HID0, r3
407
408 lis r3, CFG_HID0_FINAL@h
409 ori r3, r3, CFG_HID0_FINAL@l
410 SYNC
411 mtspr HID0, r3
412
413 /* clear all BAT's */
414 /*--------------------------------------------------------------*/
415
416 li r0, 0
417 mtspr DBAT0U, r0
418 mtspr DBAT0L, r0
419 mtspr DBAT1U, r0
420 mtspr DBAT1L, r0
421 mtspr DBAT2U, r0
422 mtspr DBAT2L, r0
423 mtspr DBAT3U, r0
424 mtspr DBAT3L, r0
wdenk35656de2003-09-14 19:08:39 +0000425 mtspr DBAT4U, r0
426 mtspr DBAT4L, r0
427 mtspr DBAT5U, r0
428 mtspr DBAT5L, r0
429 mtspr DBAT6U, r0
430 mtspr DBAT6L, r0
431 mtspr DBAT7U, r0
432 mtspr DBAT7L, r0
wdenk945af8d2003-07-16 21:53:01 +0000433 mtspr IBAT0U, r0
434 mtspr IBAT0L, r0
435 mtspr IBAT1U, r0
436 mtspr IBAT1L, r0
437 mtspr IBAT2U, r0
438 mtspr IBAT2L, r0
439 mtspr IBAT3U, r0
440 mtspr IBAT3L, r0
wdenk35656de2003-09-14 19:08:39 +0000441 mtspr IBAT4U, r0
442 mtspr IBAT4L, r0
443 mtspr IBAT5U, r0
444 mtspr IBAT5L, r0
445 mtspr IBAT6U, r0
446 mtspr IBAT6L, r0
447 mtspr IBAT7U, r0
448 mtspr IBAT7L, r0
wdenk945af8d2003-07-16 21:53:01 +0000449 SYNC
450
451 /* invalidate all tlb's */
452 /* */
453 /* From the 603e User Manual: "The 603e provides the ability to */
454 /* invalidate a TLB entry. The TLB Invalidate Entry (tlbie) */
455 /* instruction invalidates the TLB entry indexed by the EA, and */
456 /* operates on both the instruction and data TLBs simultaneously*/
457 /* invalidating four TLB entries (both sets in each TLB). The */
458 /* index corresponds to bits 15-19 of the EA. To invalidate all */
459 /* entries within both TLBs, 32 tlbie instructions should be */
460 /* issued, incrementing this field by one each time." */
461 /* */
462 /* "Note that the tlbia instruction is not implemented on the */
463 /* 603e." */
464 /* */
465 /* bits 15-19 correspond to addresses 0x00000000 to 0x0001F000 */
466 /* incrementing by 0x1000 each time. The code below is sort of */
467 /* based on code in "flush_tlbs" from arch/ppc/kernel/head.S */
468 /* */
469 /*--------------------------------------------------------------*/
470
471 li r3, 32
472 mtctr r3
473 li r3, 0
4741: tlbie r3
475 addi r3, r3, 0x1000
476 bdnz 1b
477 SYNC
478
479 /* Done! */
480 /*--------------------------------------------------------------*/
481
482 blr
483
484/* Cache functions.
485 *
486 * Note: requires that all cache bits in
487 * HID0 are in the low half word.
488 */
489 .globl icache_enable
490icache_enable:
491 mfspr r3, HID0
492 ori r3, r3, HID0_ICE
493 lis r4, 0
494 ori r4, r4, HID0_ILOCK
495 andc r3, r3, r4
496 ori r4, r3, HID0_ICFI
497 isync
498 mtspr HID0, r4 /* sets enable and invalidate, clears lock */
499 isync
500 mtspr HID0, r3 /* clears invalidate */
501 blr
502
503 .globl icache_disable
504icache_disable:
505 mfspr r3, HID0
506 lis r4, 0
507 ori r4, r4, HID0_ICE|HID0_ILOCK
508 andc r3, r3, r4
509 ori r4, r3, HID0_ICFI
510 isync
511 mtspr HID0, r4 /* sets invalidate, clears enable and lock */
512 isync
513 mtspr HID0, r3 /* clears invalidate */
514 blr
515
516 .globl icache_status
517icache_status:
518 mfspr r3, HID0
519 rlwinm r3, r3, HID0_ICE_BITPOS + 1, 31, 31
520 blr
521
522 .globl dcache_enable
523dcache_enable:
524 mfspr r3, HID0
525 ori r3, r3, HID0_DCE
526 lis r4, 0
527 ori r4, r4, HID0_DLOCK
528 andc r3, r3, r4
529 ori r4, r3, HID0_DCI
530 sync
531 mtspr HID0, r4 /* sets enable and invalidate, clears lock */
532 sync
533 mtspr HID0, r3 /* clears invalidate */
534 blr
535
536 .globl dcache_disable
537dcache_disable:
538 mfspr r3, HID0
539 lis r4, 0
540 ori r4, r4, HID0_DCE|HID0_DLOCK
541 andc r3, r3, r4
542 ori r4, r3, HID0_DCI
543 sync
544 mtspr HID0, r4 /* sets invalidate, clears enable and lock */
545 sync
546 mtspr HID0, r3 /* clears invalidate */
547 blr
548
549 .globl dcache_status
550dcache_status:
551 mfspr r3, HID0
552 rlwinm r3, r3, HID0_DCE_BITPOS + 1, 31, 31
553 blr
554
wdenk36c72872004-06-09 17:45:32 +0000555 .globl get_svr
556get_svr:
557 mfspr r3, SVR
558 blr
559
wdenk945af8d2003-07-16 21:53:01 +0000560 .globl get_pvr
561get_pvr:
562 mfspr r3, PVR
563 blr
564
565/*------------------------------------------------------------------------------*/
566
567/*
568 * void relocate_code (addr_sp, gd, addr_moni)
569 *
570 * This "function" does not return, instead it continues in RAM
571 * after relocating the monitor code.
572 *
573 * r3 = dest
574 * r4 = src
575 * r5 = length in bytes
576 * r6 = cachelinesize
577 */
578 .globl relocate_code
579relocate_code:
580 mr r1, r3 /* Set new stack pointer */
581 mr r9, r4 /* Save copy of Global Data pointer */
582 mr r10, r5 /* Save copy of Destination Address */
583
584 mr r3, r5 /* Destination Address */
585 lis r4, CFG_MONITOR_BASE@h /* Source Address */
586 ori r4, r4, CFG_MONITOR_BASE@l
587 lwz r5, GOT(__init_end)
588 sub r5, r5, r4
589 li r6, CFG_CACHELINE_SIZE /* Cache Line Size */
590
591 /*
592 * Fix GOT pointer:
593 *
594 * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
595 *
596 * Offset:
597 */
598 sub r15, r10, r4
599
600 /* First our own GOT */
601 add r14, r14, r15
602 /* then the one used by the C code */
603 add r30, r30, r15
604
605 /*
606 * Now relocate code
607 */
608
609 cmplw cr1,r3,r4
610 addi r0,r5,3
611 srwi. r0,r0,2
612 beq cr1,4f /* In place copy is not necessary */
613 beq 7f /* Protect against 0 count */
614 mtctr r0
615 bge cr1,2f
616
617 la r8,-4(r4)
618 la r7,-4(r3)
6191: lwzu r0,4(r8)
620 stwu r0,4(r7)
621 bdnz 1b
622 b 4f
623
6242: slwi r0,r0,2
625 add r8,r4,r0
626 add r7,r3,r0
6273: lwzu r0,-4(r8)
628 stwu r0,-4(r7)
629 bdnz 3b
630
631/*
632 * Now flush the cache: note that we must start from a cache aligned
633 * address. Otherwise we might miss one cache line.
634 */
6354: cmpwi r6,0
636 add r5,r3,r5
637 beq 7f /* Always flush prefetch queue in any case */
638 subi r0,r6,1
639 andc r3,r3,r0
640 mfspr r7,HID0 /* don't do dcbst if dcache is disabled */
641 rlwinm r7,r7,HID0_DCE_BITPOS+1,31,31
642 cmpwi r7,0
643 beq 9f
644 mr r4,r3
6455: dcbst 0,r4
646 add r4,r4,r6
647 cmplw r4,r5
648 blt 5b
649 sync /* Wait for all dcbst to complete on bus */
6509: mfspr r7,HID0 /* don't do icbi if icache is disabled */
651 rlwinm r7,r7,HID0_ICE_BITPOS+1,31,31
652 cmpwi r7,0
653 beq 7f
654 mr r4,r3
6556: icbi 0,r4
656 add r4,r4,r6
657 cmplw r4,r5
658 blt 6b
6597: sync /* Wait for all icbi to complete on bus */
660 isync
661
662/*
663 * We are done. Do not return, instead branch to second part of board
664 * initialization, now running from RAM.
665 */
666
667 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
668 mtlr r0
669 blr
670
671in_ram:
672
673 /*
674 * Relocation Function, r14 point to got2+0x8000
675 *
676 * Adjust got2 pointers, no need to check for 0, this code
677 * already puts a few entries in the table.
678 */
679 li r0,__got2_entries@sectoff@l
680 la r3,GOT(_GOT2_TABLE_)
681 lwz r11,GOT(_GOT2_TABLE_)
682 mtctr r0
683 sub r11,r3,r11
684 addi r3,r3,-4
6851: lwzu r0,4(r3)
686 add r0,r0,r11
687 stw r0,0(r3)
688 bdnz 1b
689
690 /*
691 * Now adjust the fixups and the pointers to the fixups
692 * in case we need to move ourselves again.
693 */
6942: li r0,__fixup_entries@sectoff@l
695 lwz r3,GOT(_FIXUP_TABLE_)
696 cmpwi r0,0
697 mtctr r0
698 addi r3,r3,-4
699 beq 4f
7003: lwzu r4,4(r3)
701 lwzux r0,r4,r11
702 add r0,r0,r11
703 stw r10,0(r3)
704 stw r0,0(r4)
705 bdnz 3b
7064:
707clear_bss:
708 /*
709 * Now clear BSS segment
710 */
711 lwz r3,GOT(__bss_start)
712 lwz r4,GOT(_end)
713
714 cmplw 0, r3, r4
715 beq 6f
716
717 li r0, 0
7185:
719 stw r0, 0(r3)
720 addi r3, r3, 4
721 cmplw 0, r3, r4
722 bne 5b
7236:
724
725 mr r3, r9 /* Global Data pointer */
726 mr r4, r10 /* Destination Address */
727 bl board_init_r
728
729 /*
730 * Copy exception vector code to low memory
731 *
732 * r3: dest_addr
733 * r7: source address, r8: end address, r9: target address
734 */
735 .globl trap_init
736trap_init:
737 lwz r7, GOT(_start)
738 lwz r8, GOT(_end_of_vectors)
739
740 li r9, 0x100 /* reset vector always at 0x100 */
741
742 cmplw 0, r7, r8
743 bgelr /* return if r7>=r8 - just in case */
744
745 mflr r4 /* save link register */
7461:
747 lwz r0, 0(r7)
748 stw r0, 0(r9)
749 addi r7, r7, 4
750 addi r9, r9, 4
751 cmplw 0, r7, r8
752 bne 1b
753
754 /*
755 * relocate `hdlr' and `int_return' entries
756 */
757 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
758 li r8, Alignment - _start + EXC_OFF_SYS_RESET
7592:
760 bl trap_reloc
761 addi r7, r7, 0x100 /* next exception vector */
762 cmplw 0, r7, r8
763 blt 2b
764
765 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
766 bl trap_reloc
767
768 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
769 bl trap_reloc
770
771 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
772 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
7733:
774 bl trap_reloc
775 addi r7, r7, 0x100 /* next exception vector */
776 cmplw 0, r7, r8
777 blt 3b
778
779 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
780 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
7814:
782 bl trap_reloc
783 addi r7, r7, 0x100 /* next exception vector */
784 cmplw 0, r7, r8
785 blt 4b
786
787 mfmsr r3 /* now that the vectors have */
788 lis r7, MSR_IP@h /* relocated into low memory */
789 ori r7, r7, MSR_IP@l /* MSR[IP] can be turned off */
790 andc r3, r3, r7 /* (if it was on) */
791 SYNC /* Some chip revs need this... */
792 mtmsr r3
793 SYNC
794
795 mtlr r4 /* restore link register */
796 blr
797
798 /*
799 * Function: relocate entries for one exception vector
800 */
801trap_reloc:
802 lwz r0, 0(r7) /* hdlr ... */
803 add r0, r0, r3 /* ... += dest_addr */
804 stw r0, 0(r7)
805
806 lwz r0, 4(r7) /* int_return ... */
807 add r0, r0, r3 /* ... += dest_addr */
808 stw r0, 4(r7)
809
810 blr