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>
6 * See file CREDITS for list of people who contributed to this
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.
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.
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,
26 * U-Boot - Startup Code for MPC8260 PowerPC based Embedded Boards
32 #define CONFIG_8260 1 /* needed for Linux kernel header files */
33 #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
35 #include <ppc_asm.tmpl>
38 #include <asm/cache.h>
41 #ifndef CONFIG_IDENT_STRING
42 #define CONFIG_IDENT_STRING ""
45 /* We don't want the MMU yet.
48 /* Floating Point enable, Machine Check and Recoverable Interr. */
50 #define MSR_KERNEL (MSR_FP|MSR_RI)
52 #define MSR_KERNEL (MSR_FP|MSR_ME|MSR_RI)
56 * Set up GOT: Global Offset Table
58 * Use r14 to access the GOT
61 GOT_ENTRY(_GOT2_TABLE_)
62 GOT_ENTRY(_FIXUP_TABLE_)
65 GOT_ENTRY(_start_of_vectors)
66 GOT_ENTRY(_end_of_vectors)
67 GOT_ENTRY(transfer_to_handler)
71 #if defined(CONFIG_HYMOD)
72 GOT_ENTRY(environment)
77 * Version string - must be in data segment because MPC8260 uses the first
78 * 256 bytes for the Hard Reset Configuration Word table (see below).
79 * Similarly, can't have the U-Boot Magic Number as the first thing in
80 * the image - don't know how this will affect the image tools, but I guess
87 .ascii " (", __DATE__, " - ", __TIME__, ")"
88 .ascii CONFIG_IDENT_STRING, "\0"
91 * Hard Reset Configuration Word (HRCW) table
93 * The Hard Reset Configuration Word (HRCW) sets a number of useful things
94 * such as whether there is an external memory controller, whether the
95 * PowerPC core is disabled (i.e. only the communications processor is
96 * active, accessed by another CPU on the bus), whether using external
97 * arbitration, external bus mode, boot port size, core initial prefix,
98 * internal space base, boot memory space, etc.
100 * These things dictate where the processor begins execution, where the
101 * boot ROM appears in memory, the memory controller setup when access
102 * boot ROM, etc. The HRCW is *extremely* important.
104 * The HRCW is read from the bus during reset. One CPU on the bus will
105 * be a hard reset configuration master, any others will be hard reset
106 * configuration slaves. The master reads eight HRCWs from flash during
107 * reset - the first it uses for itself, the other 7 it communicates to
108 * up to 7 configuration slaves by some complicated mechanism, which is
109 * not really important here.
111 * The configuration master performs 32 successive reads starting at address
112 * 0 and incrementing by 8 each read (i.e. on 64 bit boundaries) but only 8
113 * bits is read, and always from byte lane D[0-7] (so that port size of the
114 * boot device does not matter). The first four reads form the 32 bit HRCW
115 * for the master itself. The second four reads form the HRCW for the first
116 * slave, and so on, up to seven slaves. The 32 bit HRCW is formed by
117 * concatenating the four bytes, with the first read placed in byte 0 (the
118 * most significant byte), and so on with the fourth read placed in byte 3
119 * (the least significant byte).
121 #define _HRCW_TABLE_ENTRY(w) \
122 .fill 8,1,(((w)>>24)&0xff); \
123 .fill 8,1,(((w)>>16)&0xff); \
124 .fill 8,1,(((w)>> 8)&0xff); \
125 .fill 8,1,(((w) )&0xff)
129 _HRCW_TABLE_ENTRY(CFG_HRCW_MASTER)
130 _HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE1)
131 _HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE2)
132 _HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE3)
133 _HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE4)
134 _HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE5)
135 _HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE6)
136 _HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE7)
138 * After configuration, a system reset exception is executed using the
139 * vector at offset 0x100 relative to the base set by MSR[IP]. If MSR[IP]
140 * is 0, the base address is 0x00000000. If MSR[IP] is 1, the base address
141 * is 0xfff00000. In the case of a Power On Reset or Hard Reset, the value
142 * of MSR[IP] is determined by the CIP field in the HRCW.
144 * Other bits in the HRCW set up the Base Address and Port Size in BR0.
145 * This determines the location of the boot ROM (flash or EPROM) in the
146 * processor's address space at boot time. As long as the HRCW is set up
147 * so that we eventually end up executing the code below when the processor
148 * executes the reset exception, the actual values used should not matter.
150 * Once we have got here, the address mask in OR0 is cleared so that the
151 * bottom 32K of the boot ROM is effectively repeated all throughout the
152 * processor's address space, after which we can jump to the absolute
153 * address at which the boot ROM was linked at compile time, and proceed
154 * to initialise the memory controller without worrying if the rug will be
155 * pulled out from under us, so to speak (it will be fine as long as we
156 * configure BR0 with the same boot ROM link address).
158 . = EXC_OFF_SYS_RESET
162 li r21, BOOTFLAG_COLD /* Normal Power-On: Boot from FLASH*/
165 . = EXC_OFF_SYS_RESET + 0x10
169 li r21, BOOTFLAG_WARM /* Software reboot */
174 mfmsr r5 /* save msr contents */
176 #if defined(CONFIG_COGENT)
177 /* this is what the cogent EPROM does */
182 #endif /* CONFIG_COGENT */
184 #if defined(CFG_DEFAULT_IMMR)
186 ori r3, r3, CFG_IMMR@l
187 lis r4, CFG_DEFAULT_IMMR@h
189 #endif /* CFG_DEFAULT_IMMR */
191 /* Initialise the MPC8260 processor core */
192 /*--------------------------------------------------------------*/
197 /* When booting from ROM (Flash or EPROM), clear the */
198 /* Address Mask in OR0 so ROM appears everywhere */
199 /*--------------------------------------------------------------*/
201 lis r3, (CFG_IMMR+IM_REGBASE)@h
207 /* Calculate absolute address in FLASH and jump there */
208 /*--------------------------------------------------------------*/
210 lis r3, CFG_MONITOR_BASE@h
211 ori r3, r3, CFG_MONITOR_BASE@l
212 addi r3, r3, in_flash - _start + EXC_OFF_SYS_RESET
217 #endif /* CFG_RAMBOOT */
219 /* initialize some things that are hard to access from C */
220 /*--------------------------------------------------------------*/
222 lis r3, CFG_IMMR@h /* set up stack in internal DPRAM */
223 ori r1, r3, CFG_INIT_SP_OFFSET
224 li r0, 0 /* Make room for stack frame header and */
225 stwu r0, -4(r1) /* clear final stack frame so that */
226 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
228 /* let the C-code set up the rest */
230 /* Be careful to keep code relocatable ! */
231 /*--------------------------------------------------------------*/
233 GET_GOT /* initialize GOT access */
236 bl cpu_init_f /* run low-level CPU init code (in Flash)*/
239 bl init_debug /* set up debugging stuff */
244 bl board_init_f /* run 1st part of board init code (in Flash)*/
250 .globl _start_of_vectors
254 STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
256 /* Data Storage exception. */
257 STD_EXCEPTION(0x300, DataStorage, UnknownException)
259 /* Instruction Storage exception. */
260 STD_EXCEPTION(0x400, InstStorage, UnknownException)
262 /* External Interrupt exception. */
263 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
265 /* Alignment exception. */
273 addi r3,r1,STACK_FRAME_OVERHEAD
275 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
276 rlwimi r20,r23,0,25,25 /* copy IP bit from saved MSR */
277 lwz r6,GOT(transfer_to_handler)
281 .long AlignmentException - _start + EXC_OFF_SYS_RESET
282 .long int_return - _start + EXC_OFF_SYS_RESET
284 /* Program check exception */
288 addi r3,r1,STACK_FRAME_OVERHEAD
290 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
291 rlwimi r20,r23,0,25,25 /* copy IP bit from saved MSR */
292 lwz r6,GOT(transfer_to_handler)
296 .long ProgramCheckException - _start + EXC_OFF_SYS_RESET
297 .long int_return - _start + EXC_OFF_SYS_RESET
299 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
301 /* I guess we could implement decrementer, and may have
302 * to someday for timekeeping.
304 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
306 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
307 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
311 * r0 - SYSCALL number
315 addis r11,r0,0 /* get functions table addr */
316 ori r11,r11,0 /* Note: this code is patched in trap_init */
317 addis r12,r0,0 /* get number of functions */
323 rlwinm r0,r0,2,0,31 /* fn_addr = fn_tbl[r0] */
327 li r12,0xd00-4*3 /* save LR & SRRx */
335 li r12,0xc00+_back-SystemCall
344 mfmsr r11 /* Disable interrupts */
348 SYNC /* Some chip revs need this... */
352 li r12,0xd00-4*3 /* restore regs */
363 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
365 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
366 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
368 STD_EXCEPTION(0x1000, InstructionTLBMiss, UnknownException)
369 STD_EXCEPTION(0x1100, DataLoadTLBMiss, UnknownException)
370 STD_EXCEPTION(0x1200, DataStoreTLBMiss, UnknownException)
374 * This exception occurs when the program counter matches the
375 * Instruction Address Breakpoint Register (IABR).
377 * I want the cpu to halt if this occurs so I can hunt around
378 * with the debugger and look at things.
380 * When DEBUG is defined, both machine check enable (in the MSR)
381 * and checkstop reset enable (in the reset mode register) are
382 * turned off and so a checkstop condition will result in the cpu
385 * I force the cpu into a checkstop condition by putting an illegal
386 * instruction here (at least this is the theory).
388 * well - that didnt work, so just do an infinite loop!
392 STD_EXCEPTION(0x1300, InstructionBreakpoint, DebugException)
394 STD_EXCEPTION(0x1400, SMI, UnknownException)
396 STD_EXCEPTION(0x1500, Trap_15, UnknownException)
397 STD_EXCEPTION(0x1600, Trap_16, UnknownException)
398 STD_EXCEPTION(0x1700, Trap_17, UnknownException)
399 STD_EXCEPTION(0x1800, Trap_18, UnknownException)
400 STD_EXCEPTION(0x1900, Trap_19, UnknownException)
401 STD_EXCEPTION(0x1a00, Trap_1a, UnknownException)
402 STD_EXCEPTION(0x1b00, Trap_1b, UnknownException)
403 STD_EXCEPTION(0x1c00, Trap_1c, UnknownException)
404 STD_EXCEPTION(0x1d00, Trap_1d, UnknownException)
405 STD_EXCEPTION(0x1e00, Trap_1e, UnknownException)
406 STD_EXCEPTION(0x1f00, Trap_1f, UnknownException)
407 STD_EXCEPTION(0x2000, Trap_20, UnknownException)
408 STD_EXCEPTION(0x2100, Trap_21, UnknownException)
409 STD_EXCEPTION(0x2200, Trap_22, UnknownException)
410 STD_EXCEPTION(0x2300, Trap_23, UnknownException)
411 STD_EXCEPTION(0x2400, Trap_24, UnknownException)
412 STD_EXCEPTION(0x2500, Trap_25, UnknownException)
413 STD_EXCEPTION(0x2600, Trap_26, UnknownException)
414 STD_EXCEPTION(0x2700, Trap_27, UnknownException)
415 STD_EXCEPTION(0x2800, Trap_28, UnknownException)
416 STD_EXCEPTION(0x2900, Trap_29, UnknownException)
417 STD_EXCEPTION(0x2a00, Trap_2a, UnknownException)
418 STD_EXCEPTION(0x2b00, Trap_2b, UnknownException)
419 STD_EXCEPTION(0x2c00, Trap_2c, UnknownException)
420 STD_EXCEPTION(0x2d00, Trap_2d, UnknownException)
421 STD_EXCEPTION(0x2e00, Trap_2e, UnknownException)
422 STD_EXCEPTION(0x2f00, Trap_2f, UnknownException)
425 .globl _end_of_vectors
431 * This code finishes saving the registers to the exception frame
432 * and jumps to the appropriate handler for the exception.
433 * Register r21 is pointer into trap frame, r1 has new stack pointer.
435 .globl transfer_to_handler
446 andi. r24,r23,0x3f00 /* get vector offset */
450 lwz r24,0(r23) /* virtual address of handler */
451 lwz r23,4(r23) /* where to go when done */
456 rfi /* jump to handler, enable MMU */
459 mfmsr r28 /* Disable interrupts */
463 SYNC /* Some chip revs need this... */
478 lwz r2,_NIP(r1) /* Restore environment */
488 #if defined(CONFIG_COGENT)
491 * This code initialises the MPC8260 processor core
492 * (conforms to PowerPC 603e spec)
495 .globl cogent_init_8260
498 /* Taken from page 14 of CMA282 manual */
499 /*--------------------------------------------------------------*/
501 lis r4, (CFG_IMMR+IM_REGBASE)@h
503 stw r3, IM_IMMR@l(r4)
504 lwz r3, IM_IMMR@l(r4)
507 ori r3, r3, CFG_SYPCR@l
508 stw r3, IM_SYPCR@l(r4)
509 lwz r3, IM_SYPCR@l(r4)
512 ori r3, r3, CFG_SCCR@l
513 stw r3, IM_SCCR@l(r4)
514 lwz r3, IM_SCCR@l(r4)
517 /* the rest of this was disassembled from the */
518 /* EPROM code that came with my CMA282 CPU module */
519 /*--------------------------------------------------------------*/
533 /*--------------------------------------------------------------*/
537 #endif /* CONFIG_COGENT */
540 * This code initialises the MPC8260 processor core
541 * (conforms to PowerPC 603e spec)
542 * Note: expects original MSR contents to be in r5.
545 .globl init_8260_core
548 /* Initialize machine status; enable machine check interrupt */
549 /*--------------------------------------------------------------*/
551 li r3, MSR_KERNEL /* Set ME and RI flags */
552 rlwimi r3, r5, 0, 25, 25 /* preserve IP bit set by HRCW */
554 rlwimi r3, r5, 0, 21, 22 /* debugger might set SE & BE bits */
556 SYNC /* Some chip revs need this... */
559 mtspr SRR1, r3 /* Make SRR1 match MSR */
561 /* Initialise the SYPCR early, and reset the watchdog (if req) */
562 /*--------------------------------------------------------------*/
564 lis r3, (CFG_IMMR+IM_REGBASE)@h
565 #if !defined(CONFIG_COGENT)
567 ori r4, r4, CFG_SYPCR@l
568 stw r4, IM_SYPCR@l(r3)
569 #endif /* !CONFIG_COGENT */
570 #if defined(CONFIG_WATCHDOG)
571 li r4, 21868 /* = 0x556c */
572 sth r4, IM_SWSR@l(r3)
573 li r4, -21959 /* = 0xaa39 */
574 sth r4, IM_SWSR@l(r3)
575 #endif /* CONFIG_WATCHDOG */
577 /* Initialize the Hardware Implementation-dependent Registers */
578 /* HID0 also contains cache control */
579 /*--------------------------------------------------------------*/
581 lis r3, CFG_HID0_INIT@h
582 ori r3, r3, CFG_HID0_INIT@l
586 lis r3, CFG_HID0_FINAL@h
587 ori r3, r3, CFG_HID0_FINAL@l
592 ori r3, r3, CFG_HID2@l
595 /* clear all BAT's */
596 /*--------------------------------------------------------------*/
617 /* invalidate all tlb's */
619 /* From the 603e User Manual: "The 603e provides the ability to */
620 /* invalidate a TLB entry. The TLB Invalidate Entry (tlbie) */
621 /* instruction invalidates the TLB entry indexed by the EA, and */
622 /* operates on both the instruction and data TLBs simultaneously*/
623 /* invalidating four TLB entries (both sets in each TLB). The */
624 /* index corresponds to bits 15-19 of the EA. To invalidate all */
625 /* entries within both TLBs, 32 tlbie instructions should be */
626 /* issued, incrementing this field by one each time." */
628 /* "Note that the tlbia instruction is not implemented on the */
631 /* bits 15-19 correspond to addresses 0x00000000 to 0x0001F000 */
632 /* incrementing by 0x1000 each time. The code below is sort of */
633 /* based on code in "flush_tlbs" from arch/ppc/kernel/head.S */
635 /*--------------------------------------------------------------*/
646 /*--------------------------------------------------------------*/
653 * initialise things related to debugging.
655 * must be called after the global offset table (GOT) is initialised
656 * (GET_GOT) and after cpu_init_f() has executed.
662 lis r3, (CFG_IMMR+IM_REGBASE)@h
664 /* Quick and dirty hack to enable the RAM and copy the */
665 /* vectors so that we can take exceptions. */
666 /*--------------------------------------------------------------*/
667 /* write Memory Refresh Prescaler */
669 sth r4, IM_MPTPR@l(r3)
670 /* write 60x Refresh Timer */
672 stb r4, IM_PSRT@l(r3)
673 /* init the 60x SDRAM Mode Register */
674 lis r4, (CFG_PSDMR|PSDMR_OP_NORM)@h
675 ori r4, r4, (CFG_PSDMR|PSDMR_OP_NORM)@l
676 stw r4, IM_PSDMR@l(r3)
677 /* write Precharge All Banks command */
678 lis r4, (CFG_PSDMR|PSDMR_OP_PREA)@h
679 ori r4, r4, (CFG_PSDMR|PSDMR_OP_PREA)@l
680 stw r4, IM_PSDMR@l(r3)
682 /* write eight CBR Refresh commands */
683 lis r4, (CFG_PSDMR|PSDMR_OP_CBRR)@h
684 ori r4, r4, (CFG_PSDMR|PSDMR_OP_CBRR)@l
685 stw r4, IM_PSDMR@l(r3)
694 /* write Mode Register Write command */
695 lis r4, (CFG_PSDMR|PSDMR_OP_MRW)@h
696 ori r4, r4, (CFG_PSDMR|PSDMR_OP_MRW)@l
697 stw r4, IM_PSDMR@l(r3)
699 /* write Normal Operation command and enable Refresh */
700 lis r4, (CFG_PSDMR|PSDMR_OP_NORM|PSDMR_RFEN)@h
701 ori r4, r4, (CFG_PSDMR|PSDMR_OP_NORM|PSDMR_RFEN)@l
702 stw r4, IM_PSDMR@l(r3)
704 /* RAM should now be operational */
706 #define VEC_WRD_CNT ((_end_of_vectors - _start + EXC_OFF_SYS_RESET) / 4)
708 lwz r3, GOT(_end_of_vectors)
709 rlwinm r4, r3, 0, 18, 31 /* _end_of_vectors & 0x3FFF */
710 lis r5, VEC_WRD_CNT@h
711 ori r5, r5, VEC_WRD_CNT@l
718 /* Load the Instruction Address Breakpoint Register (IABR). */
720 /* The address to load is stored in the first word of dual port */
721 /* ram and should be preserved while the power is on, so you */
722 /* can plug addresses into that location then reset the cpu and */
723 /* this code will load that address into the IABR after the */
726 /* When the program counter matches the contents of the IABR, */
727 /* an exception is generated (before the instruction at that */
728 /* location completes). The vector for this exception is 0x1300 */
729 /*--------------------------------------------------------------*/
734 /* Set the entire dual port RAM (where the initial stack */
735 /* resides) to a known value - makes it easier to see where */
736 /* the stack has been written */
737 /*--------------------------------------------------------------*/
738 lis r3, (CFG_IMMR + CFG_INIT_SP_OFFSET)@h
739 ori r3, r3, (CFG_IMMR + CFG_INIT_SP_OFFSET)@l
740 li r4, ((CFG_INIT_SP_OFFSET - 4) / 4)
743 ori r4, r4, 0xdeadbeaf@l
749 /*--------------------------------------------------------------*/
756 * Note: requires that all cache bits in
757 * HID0 are in the low half word.
764 ori r4, r4, HID0_ILOCK
766 ori r4, r3, HID0_ICFI
768 mtspr HID0, r4 /* sets enable and invalidate, clears lock */
770 mtspr HID0, r3 /* clears invalidate */
773 .globl icache_disable
777 ori r4, r4, HID0_ICE|HID0_ILOCK
779 ori r4, r3, HID0_ICFI
781 mtspr HID0, r4 /* sets invalidate, clears enable and lock */
783 mtspr HID0, r3 /* clears invalidate */
789 rlwinm r3, r3, HID0_ICE_BITPOS + 1, 31, 31
797 ori r4, r4, HID0_DLOCK
801 mtspr HID0, r4 /* sets enable and invalidate, clears lock */
803 mtspr HID0, r3 /* clears invalidate */
806 .globl dcache_disable
810 ori r4, r4, HID0_DCE|HID0_DLOCK
814 mtspr HID0, r4 /* sets invalidate, clears enable and lock */
816 mtspr HID0, r3 /* clears invalidate */
822 rlwinm r3, r3, HID0_DCE_BITPOS + 1, 31, 31
830 /*------------------------------------------------------------------------------*/
833 * void relocate_code (addr_sp, gd, addr_moni)
835 * This "function" does not return, instead it continues in RAM
836 * after relocating the monitor code.
840 * r5 = length in bytes
845 mr r1, r3 /* Set new stack pointer */
846 mr r9, r4 /* Save copy of Global Data pointer */
847 mr r10, r5 /* Save copy of Destination Address */
849 mr r3, r5 /* Destination Address */
850 lis r4, CFG_MONITOR_BASE@h /* Source Address */
851 ori r4, r4, CFG_MONITOR_BASE@l
852 lis r5, CFG_MONITOR_LEN@h /* Length in Bytes */
853 ori r5, r5, CFG_MONITOR_LEN@l
854 li r6, CFG_CACHELINE_SIZE /* Cache Line Size */
859 * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
865 /* First our own GOT */
867 /* then the one used by the C code */
877 beq cr1,4f /* In place copy is not necessary */
878 beq 7f /* Protect against 0 count */
897 * Now flush the cache: note that we must start from a cache aligned
898 * address. Otherwise we might miss one cache line.
902 beq 7f /* Always flush prefetch queue in any case */
905 mfspr r7,HID0 /* don't do dcbst if dcache is disabled */
906 rlwinm r7,r7,HID0_DCE_BITPOS+1,31,31
914 sync /* Wait for all dcbst to complete on bus */
915 9: mfspr r7,HID0 /* don't do icbi if icache is disabled */
916 rlwinm r7,r7,HID0_ICE_BITPOS+1,31,31
924 7: sync /* Wait for all icbi to complete on bus */
928 * We are done. Do not return, instead branch to second part of board
929 * initialization, now running from RAM.
932 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
939 * Relocation Function, r14 point to got2+0x8000
941 * Adjust got2 pointers, no need to check for 0, this code
942 * already puts a few entries in the table.
944 li r0,__got2_entries@sectoff@l
945 la r3,GOT(_GOT2_TABLE_)
946 lwz r11,GOT(_GOT2_TABLE_)
956 * Now adjust the fixups and the pointers to the fixups
957 * in case we need to move ourselves again.
959 2: li r0,__fixup_entries@sectoff@l
960 lwz r3,GOT(_FIXUP_TABLE_)
974 * Now clear BSS segment
977 #if defined(CONFIG_HYMOD)
979 * For HYMOD - the environment is the very last item in flash.
980 * The real .bss stops just before environment starts, so only
981 * clear up to that point.
983 * taken from mods for FADS board
985 lwz r4,GOT(environment)
1001 mr r3, r9 /* Global Data pointer */
1002 mr r4, r10 /* Destination Address */
1005 /* Problems accessing "end" in C, so do it here */
1012 * Copy exception vector code to low memory
1015 * r7: source address, r8: end address, r9: target address
1020 lwz r8, GOT(_end_of_vectors)
1022 rlwinm r9, r7, 0, 18, 31 /* _start & 0x3FFF */
1025 bgelr /* return if r7>=r8 - just in case */
1027 mflr r4 /* save link register */
1037 * relocate `hdlr' and `int_return' entries
1039 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
1040 li r8, Alignment - _start + EXC_OFF_SYS_RESET
1043 addi r7, r7, 0x100 /* next exception vector */
1047 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
1050 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
1053 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
1054 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
1057 addi r7, r7, 0x100 /* next exception vector */
1061 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
1062 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
1065 addi r7, r7, 0x100 /* next exception vector */
1069 mfmsr r3 /* now that the vectors have */
1070 lis r7, MSR_IP@h /* relocated into low memory */
1071 ori r7, r7, MSR_IP@l /* MSR[IP] can be turned off */
1072 andc r3, r3, r7 /* (if it was on) */
1073 SYNC /* Some chip revs need this... */
1077 mtlr r4 /* restore link register */
1081 * Function: relocate entries for one exception vector
1084 lwz r0, 0(r7) /* hdlr ... */
1085 add r0, r0, r3 /* ... += dest_addr */
1088 lwz r0, 4(r7) /* int_return ... */
1089 add r0, r0, r3 /* ... += dest_addr */