1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (C) 1998 Dan Malek <dmalek@jlc.net>
4 * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
5 * Copyright (C) 2000, 2001,2002 Wolfgang Denk <wd@denx.de>
6 * Copyright Freescale Semiconductor, Inc. 2004, 2006, 2008.
10 * U-Boot - Startup Code for MPC83xx PowerPC based Embedded Boards
13 #include <asm-offsets.h>
16 #include <system-constants.h>
18 #include <ppc_asm.tmpl>
21 #include <asm/cache.h>
23 #include <asm/fsl_lbc.h>
24 #include <asm/u-boot.h>
26 #include "hrcw/hrcw.h"
27 #include "bats/bats.h"
30 /* We don't want the MMU yet.
35 * Floating Point enable, Machine Check and Recoverable Interr.
38 #define MSR_KERNEL (MSR_FP|MSR_RI)
40 #define MSR_KERNEL (MSR_FP|MSR_ME|MSR_RI)
43 #if defined(CONFIG_NAND_SPL) || \
44 (defined(CONFIG_SPL_BUILD) && CONFIG_IS_ENABLED(INIT_MINIMAL))
48 #if !defined(CONFIG_SPL_BUILD) && !defined(CONFIG_NAND_SPL) && \
49 !defined(CONFIG_SYS_RAMBOOT)
50 #define CFG_SYS_FLASHBOOT
54 * Set up GOT: Global Offset Table
56 * Use r12 to access the GOT
59 GOT_ENTRY(_GOT2_TABLE_)
60 GOT_ENTRY(__bss_start)
64 GOT_ENTRY(_FIXUP_TABLE_)
66 GOT_ENTRY(_start_of_vectors)
67 GOT_ENTRY(_end_of_vectors)
68 GOT_ENTRY(transfer_to_handler)
73 * The Hard Reset Configuration Word (HRCW) table is in the first 64
74 * (0x40) bytes of flash. It has 8 bytes, but each byte is repeated 8
75 * times so the processor can fetch it out of flash whether the flash
76 * is 8, 16, 32, or 64 bits wide (hardware trickery).
79 #define _HRCW_TABLE_ENTRY(w) \
80 .fill 8,1,(((w)>>24)&0xff); \
81 .fill 8,1,(((w)>>16)&0xff); \
82 .fill 8,1,(((w)>> 8)&0xff); \
83 .fill 8,1,(((w) )&0xff)
85 _HRCW_TABLE_ENTRY(CFG_SYS_HRCW_LOW)
86 _HRCW_TABLE_ENTRY(CFG_SYS_HRCW_HIGH)
89 * Magic number and version string - put it after the HRCW since it
90 * cannot be first in flash like it is in many other processors.
92 .long 0x27051956 /* U-Boot Magic Number */
94 .globl enable_addr_trans
96 /* enable address translation */
98 ori r5, r5, (MSR_IR | MSR_DR)
103 .globl disable_addr_trans
105 /* disable address translation */
108 andi. r0, r3, (MSR_IR | MSR_DR)
115 #ifndef CONFIG_DEFAULT_IMMR
116 #error CONFIG_DEFAULT_IMMR must be defined
117 #endif /* CONFIG_DEFAULT_IMMR */
120 * After configuration, a system reset exception is executed using the
121 * vector at offset 0x100 relative to the base set by MSR[IP]. If
122 * MSR[IP] is 0, the base address is 0x00000000. If MSR[IP] is 1, the
123 * base address is 0xfff00000. In the case of a Power On Reset or Hard
124 * Reset, the value of MSR[IP] is determined by the CIP field in the
127 * Other bits in the HRCW set up the Base Address and Port Size in BR0.
128 * This determines the location of the boot ROM (flash or EPROM) in the
129 * processor's address space at boot time. As long as the HRCW is set up
130 * so that we eventually end up executing the code below when the
131 * processor executes the reset exception, the actual values used should
134 * Once we have got here, the address mask in OR0 is cleared so that the
135 * bottom 32K of the boot ROM is effectively repeated all throughout the
136 * processor's address space, after which we can jump to the absolute
137 * address at which the boot ROM was linked at compile time, and proceed
138 * to initialise the memory controller without worrying if the rug will
139 * be pulled out from under us, so to speak (it will be fine as long as
140 * we configure BR0 with the same boot ROM link address).
142 . = EXC_OFF_SYS_RESET
145 _start: /* time t 0 */
146 lis r4, CONFIG_DEFAULT_IMMR@h
149 mfmsr r5 /* save msr contents */
151 /* 83xx manuals prescribe a specific sequence for updating IMMRBAR. */
155 lis r3, CONFIG_SYS_IMMR@h
156 ori r3, r3, CONFIG_SYS_IMMR@l
162 lwz r6, 0(r7) /* Arbitrary external load */
168 /* Initialise the E300 processor core */
169 /*------------------------------------------*/
171 #if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_MPC83XX_WAIT_FOR_NAND)) || \
172 defined(CONFIG_NAND_SPL)
173 /* The FCM begins execution after only the first page
174 * is loaded. Wait for the rest before branching
175 * to another flash page.
177 1: lwz r6, 0x50b0(r3)
184 #ifdef CFG_SYS_FLASHBOOT
186 /* Inflate flash location so it appears everywhere, calculate */
187 /* the absolute address in final location of the FLASH, jump */
188 /* there and deflate the flash size back to minimal size */
189 /*------------------------------------------------------------*/
191 lis r4, (CONFIG_SYS_MONITOR_BASE)@h
192 ori r4, r4, (CONFIG_SYS_MONITOR_BASE)@l
193 addi r5, r4, in_flash - _start + EXC_OFF_SYS_RESET
197 #if 1 /* Remapping flash with LAW0. */
198 bl remap_flash_by_law0
200 #endif /* CFG_SYS_FLASHBOOT */
207 * Cache must be enabled here for stack-in-cache trick.
208 * This means we need to enable the BATS.
210 * 1) for the EVB, original gt regs need to be mapped
211 * 2) need to have an IBAT for the 0xf region,
212 * we are running there!
213 * Cache should be turned on after BATs, since by default
214 * everything is write-through.
215 * The init-mem BAT can be reused after reloc. The old
216 * gt-regs BAT can be reused after board_init_f calls
217 * board_early_init_f (EVB only).
219 #ifdef CONFIG_SYS_INIT_RAM_LOCK
220 /* enable address translation */
224 /* enable the data cache */
231 /* set up the stack pointer in our newly created
232 * cache-ram; use r3 to keep the new SP for now to
233 * avoid overiding the SP it uselessly */
234 lis r3, SYS_INIT_SP_ADDR@h
235 ori r3, r3, SYS_INIT_SP_ADDR@l
237 /* r4 = end of GD area */
238 addi r4, r3, GENERATED_GBL_DATA_SIZE
248 #if CONFIG_IS_ENABLED(SYS_MALLOC_F)
250 #if CONFIG_VAL(SYS_MALLOC_F_LEN) + GENERATED_GBL_DATA_SIZE > CFG_SYS_INIT_RAM_SIZE
251 #error "SYS_MALLOC_F_LEN too large to fit into initial RAM."
254 /* r3 = new stack pointer / pre-reloc malloc area */
255 subi r3, r3, CONFIG_VAL(SYS_MALLOC_F_LEN)
257 /* Set pointer to pre-reloc malloc area in GD */
258 stw r3, GD_MALLOC_BASE(r4)
260 li r0, 0 /* Make room for stack frame header and */
261 stwu r0, -4(r3) /* clear final stack frame so that */
262 stwu r0, -4(r3) /* stack backtraces terminate cleanly */
264 /* Finally, actually set SP */
267 /* let the C-code set up the rest */
269 /* Be careful to keep code relocatable & stack humble */
270 /*------------------------------------------------------*/
272 GET_GOT /* initialize GOT access */
273 /* Needed for -msingle-pic-base */
274 bl _GLOBAL_OFFSET_TABLE_@local-4
278 lis r3, CONFIG_SYS_IMMR@h
279 /* run low-level CPU init code (in Flash)*/
282 /* run 1st part of board init code (in Flash)*/
283 li r3, 0 /* clear boot_flag for calling board_init_f */
286 /* NOTREACHED - board_init_f() does not return */
293 .globl _start_of_vectors
297 STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
299 /* Data Storage exception. */
300 STD_EXCEPTION(0x300, DataStorage, UnknownException)
302 /* Instruction Storage exception. */
303 STD_EXCEPTION(0x400, InstStorage, UnknownException)
305 /* External Interrupt exception. */
307 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
310 /* Alignment exception. */
313 EXCEPTION_PROLOG(SRR0, SRR1)
318 addi r3,r1,STACK_FRAME_OVERHEAD
319 EXC_XFER_TEMPLATE(Alignment, AlignmentException, MSR_KERNEL, COPY_EE)
321 /* Program check exception */
324 EXCEPTION_PROLOG(SRR0, SRR1)
325 addi r3,r1,STACK_FRAME_OVERHEAD
326 EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException,
329 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
331 /* I guess we could implement decrementer, and may have
332 * to someday for timekeeping.
334 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
336 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
337 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
338 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
339 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
341 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
342 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
344 STD_EXCEPTION(0x1000, InstructionTLBMiss, UnknownException)
345 STD_EXCEPTION(0x1100, DataLoadTLBMiss, UnknownException)
346 STD_EXCEPTION(0x1200, DataStoreTLBMiss, UnknownException)
350 * This exception occurs when the program counter matches the
351 * Instruction Address Breakpoint Register (IABR).
353 * I want the cpu to halt if this occurs so I can hunt around
354 * with the debugger and look at things.
356 * When DEBUG is defined, both machine check enable (in the MSR)
357 * and checkstop reset enable (in the reset mode register) are
358 * turned off and so a checkstop condition will result in the cpu
361 * I force the cpu into a checkstop condition by putting an illegal
362 * instruction here (at least this is the theory).
364 * well - that didnt work, so just do an infinite loop!
368 STD_EXCEPTION(0x1300, InstructionBreakpoint, DebugException)
370 STD_EXCEPTION(0x1400, SMI, UnknownException)
372 STD_EXCEPTION(0x1500, Trap_15, UnknownException)
373 STD_EXCEPTION(0x1600, Trap_16, UnknownException)
374 STD_EXCEPTION(0x1700, Trap_17, UnknownException)
375 STD_EXCEPTION(0x1800, Trap_18, UnknownException)
376 STD_EXCEPTION(0x1900, Trap_19, UnknownException)
377 STD_EXCEPTION(0x1a00, Trap_1a, UnknownException)
378 STD_EXCEPTION(0x1b00, Trap_1b, UnknownException)
379 STD_EXCEPTION(0x1c00, Trap_1c, UnknownException)
380 STD_EXCEPTION(0x1d00, Trap_1d, UnknownException)
381 STD_EXCEPTION(0x1e00, Trap_1e, UnknownException)
382 STD_EXCEPTION(0x1f00, Trap_1f, UnknownException)
383 STD_EXCEPTION(0x2000, Trap_20, UnknownException)
384 STD_EXCEPTION(0x2100, Trap_21, UnknownException)
385 STD_EXCEPTION(0x2200, Trap_22, UnknownException)
386 STD_EXCEPTION(0x2300, Trap_23, UnknownException)
387 STD_EXCEPTION(0x2400, Trap_24, UnknownException)
388 STD_EXCEPTION(0x2500, Trap_25, UnknownException)
389 STD_EXCEPTION(0x2600, Trap_26, UnknownException)
390 STD_EXCEPTION(0x2700, Trap_27, UnknownException)
391 STD_EXCEPTION(0x2800, Trap_28, UnknownException)
392 STD_EXCEPTION(0x2900, Trap_29, UnknownException)
393 STD_EXCEPTION(0x2a00, Trap_2a, UnknownException)
394 STD_EXCEPTION(0x2b00, Trap_2b, UnknownException)
395 STD_EXCEPTION(0x2c00, Trap_2c, UnknownException)
396 STD_EXCEPTION(0x2d00, Trap_2d, UnknownException)
397 STD_EXCEPTION(0x2e00, Trap_2e, UnknownException)
398 STD_EXCEPTION(0x2f00, Trap_2f, UnknownException)
401 .globl _end_of_vectors
407 * This code finishes saving the registers to the exception frame
408 * and jumps to the appropriate handler for the exception.
409 * Register r21 is pointer into trap frame, r1 has new stack pointer.
411 .globl transfer_to_handler
422 andi. r24,r23,0x3f00 /* get vector offset */
426 lwz r24,0(r23) /* virtual address of handler */
427 lwz r23,4(r23) /* where to go when done */
432 rfi /* jump to handler, enable MMU */
435 mfmsr r28 /* Disable interrupts */
439 SYNC /* Some chip revs need this... */
454 lwz r2,_NIP(r1) /* Restore environment */
463 #endif /* !MINIMAL_SPL */
466 * This code initialises the E300 processor core
467 * (conforms to PowerPC 603e spec)
468 * Note: expects original MSR contents to be in r5.
470 .globl init_e300_core
471 init_e300_core: /* time t 10 */
472 /* Initialize machine status; enable machine check interrupt */
473 /*-----------------------------------------------------------*/
475 li r3, MSR_KERNEL /* Set ME and RI flags */
476 rlwimi r3, r5, 0, 25, 25 /* preserve IP bit set by HRCW */
478 rlwimi r3, r5, 0, 21, 22 /* debugger might set SE & BE bits */
480 SYNC /* Some chip revs need this... */
483 mtspr SRR1, r3 /* Make SRR1 match MSR */
486 lis r3, CONFIG_SYS_IMMR@h
487 #ifndef CONFIG_WDT_MPC8xxx
488 #if defined(CONFIG_WATCHDOG)
489 /* Initialise the Watchdog values and reset it (if req) */
490 /*------------------------------------------------------*/
491 lis r4, CFG_SYS_WATCHDOG_VALUE
492 ori r4, r4, (SWCRR_SWEN | SWCRR_SWRI | SWCRR_SWPR)
502 /* Disable Watchdog */
503 /*-------------------*/
505 /* Check to see if its enabled for disabling
506 once disabled by SW you can't re-enable */
512 #endif /* CONFIG_WATCHDOG */
515 #if defined(CONFIG_MASK_AER_AO)
516 /* Write the Arbiter Event Enable to mask Address Only traps. */
517 /* This prevents the dcbz instruction from being trapped when */
518 /* HID0_ABE Address Broadcast Enable is set and the MEMORY */
519 /* COHERENCY bit is set in the WIMG bits, which is often */
520 /* needed for PCI operation. */
522 rlwinm r0, r4, 0, ~AER_AO
524 #endif /* CONFIG_MASK_AER_AO */
526 /* Initialize the Hardware Implementation-dependent Registers */
527 /* HID0 also contains cache control */
528 /* - force invalidation of data and instruction caches */
529 /*------------------------------------------------------*/
531 lis r3, CFG_SYS_HID0_INIT@h
532 ori r3, r3, (CFG_SYS_HID0_INIT | HID0_ICFI | HID0_DCFI)@l
536 lis r3, CFG_SYS_HID0_FINAL@h
537 ori r3, r3, (CFG_SYS_HID0_FINAL & ~(HID0_ICFI | HID0_DCFI))@l
541 lis r3, CFG_SYS_HID2@h
542 ori r3, r3, CFG_SYS_HID2@l
547 /*------------------------------*/
550 /* setup_bats - set them up to some initial state */
556 addis r4, r0, CFG_SYS_IBAT0L@h
557 ori r4, r4, CFG_SYS_IBAT0L@l
558 addis r3, r0, CFG_SYS_IBAT0U@h
559 ori r3, r3, CFG_SYS_IBAT0U@l
564 addis r4, r0, CFG_SYS_DBAT0L@h
565 ori r4, r4, CFG_SYS_DBAT0L@l
566 addis r3, r0, CFG_SYS_DBAT0U@h
567 ori r3, r3, CFG_SYS_DBAT0U@l
572 addis r4, r0, CFG_SYS_IBAT1L@h
573 ori r4, r4, CFG_SYS_IBAT1L@l
574 addis r3, r0, CFG_SYS_IBAT1U@h
575 ori r3, r3, CFG_SYS_IBAT1U@l
580 addis r4, r0, CFG_SYS_DBAT1L@h
581 ori r4, r4, CFG_SYS_DBAT1L@l
582 addis r3, r0, CFG_SYS_DBAT1U@h
583 ori r3, r3, CFG_SYS_DBAT1U@l
588 addis r4, r0, CFG_SYS_IBAT2L@h
589 ori r4, r4, CFG_SYS_IBAT2L@l
590 addis r3, r0, CFG_SYS_IBAT2U@h
591 ori r3, r3, CFG_SYS_IBAT2U@l
596 addis r4, r0, CFG_SYS_DBAT2L@h
597 ori r4, r4, CFG_SYS_DBAT2L@l
598 addis r3, r0, CFG_SYS_DBAT2U@h
599 ori r3, r3, CFG_SYS_DBAT2U@l
604 addis r4, r0, CFG_SYS_IBAT3L@h
605 ori r4, r4, CFG_SYS_IBAT3L@l
606 addis r3, r0, CFG_SYS_IBAT3U@h
607 ori r3, r3, CFG_SYS_IBAT3U@l
612 addis r4, r0, CFG_SYS_DBAT3L@h
613 ori r4, r4, CFG_SYS_DBAT3L@l
614 addis r3, r0, CFG_SYS_DBAT3U@h
615 ori r3, r3, CFG_SYS_DBAT3U@l
619 #ifdef CONFIG_HIGH_BATS
621 addis r4, r0, CFG_SYS_IBAT4L@h
622 ori r4, r4, CFG_SYS_IBAT4L@l
623 addis r3, r0, CFG_SYS_IBAT4U@h
624 ori r3, r3, CFG_SYS_IBAT4U@l
629 addis r4, r0, CFG_SYS_DBAT4L@h
630 ori r4, r4, CFG_SYS_DBAT4L@l
631 addis r3, r0, CFG_SYS_DBAT4U@h
632 ori r3, r3, CFG_SYS_DBAT4U@l
637 addis r4, r0, CFG_SYS_IBAT5L@h
638 ori r4, r4, CFG_SYS_IBAT5L@l
639 addis r3, r0, CFG_SYS_IBAT5U@h
640 ori r3, r3, CFG_SYS_IBAT5U@l
645 addis r4, r0, CFG_SYS_DBAT5L@h
646 ori r4, r4, CFG_SYS_DBAT5L@l
647 addis r3, r0, CFG_SYS_DBAT5U@h
648 ori r3, r3, CFG_SYS_DBAT5U@l
653 addis r4, r0, CFG_SYS_IBAT6L@h
654 ori r4, r4, CFG_SYS_IBAT6L@l
655 addis r3, r0, CFG_SYS_IBAT6U@h
656 ori r3, r3, CFG_SYS_IBAT6U@l
661 addis r4, r0, CFG_SYS_DBAT6L@h
662 ori r4, r4, CFG_SYS_DBAT6L@l
663 addis r3, r0, CFG_SYS_DBAT6U@h
664 ori r3, r3, CFG_SYS_DBAT6U@l
669 addis r4, r0, CFG_SYS_IBAT7L@h
670 ori r4, r4, CFG_SYS_IBAT7L@l
671 addis r3, r0, CFG_SYS_IBAT7U@h
672 ori r3, r3, CFG_SYS_IBAT7U@l
677 addis r4, r0, CFG_SYS_DBAT7L@h
678 ori r4, r4, CFG_SYS_DBAT7L@l
679 addis r3, r0, CFG_SYS_DBAT7U@h
680 ori r3, r3, CFG_SYS_DBAT7U@l
687 /* invalidate all tlb's
689 * From the 603e User Manual: "The 603e provides the ability to
690 * invalidate a TLB entry. The TLB Invalidate Entry (tlbie)
691 * instruction invalidates the TLB entry indexed by the EA, and
692 * operates on both the instruction and data TLBs simultaneously
693 * invalidating four TLB entries (both sets in each TLB). The
694 * index corresponds to bits 15-19 of the EA. To invalidate all
695 * entries within both TLBs, 32 tlbie instructions should be
696 * issued, incrementing this field by one each time."
698 * "Note that the tlbia instruction is not implemented on the
701 * bits 15-19 correspond to addresses 0x00000000 to 0x0001F000
702 * incrementing by 0x1000 each time. The code below is sort of
703 * based on code in "flush_tlbs" from arch/powerpc/kernel/head.S
719 * Note: requires that all cache bits in
720 * HID0 are in the low half word.
727 li r4, HID0_ICFI|HID0_ILOCK
729 ori r4, r3, HID0_ICFI
731 mtspr HID0, r4 /* sets enable and invalidate, clears lock */
733 mtspr HID0, r3 /* clears invalidate */
736 .globl icache_disable
740 ori r4, r4, HID0_ICE|HID0_ICFI|HID0_ILOCK
743 mtspr HID0, r3 /* clears invalidate, enable and lock */
749 rlwinm r3, r3, (31 - HID0_ICE_SHIFT + 1), 31, 31
751 #endif /* !MINIMAL_SPL */
756 li r5, HID0_DCFI|HID0_DLOCK
760 mtspr HID0, r3 /* enable, no invalidate */
763 .globl dcache_disable
766 bl flush_dcache /* uses r3 and r5 */
768 li r5, HID0_DCE|HID0_DLOCK
770 ori r5, r3, HID0_DCFI
772 mtspr HID0, r5 /* sets invalidate, clears enable and lock */
774 mtspr HID0, r3 /* clears invalidate */
781 rlwinm r3, r3, (31 - HID0_DCE_SHIFT + 1), 31, 31
787 lis r5, CONFIG_SYS_CACHELINE_SIZE
791 lis r5, CONFIG_SYS_CACHELINE_SIZE
796 /*-------------------------------------------------------------------*/
799 * void relocate_code(addr_sp, gd, addr_moni)
801 * This "function" does not return, instead it continues in RAM
802 * after relocating the monitor code.
806 * r5 = length in bytes
811 mr r1, r3 /* Set new stack pointer */
812 mr r9, r4 /* Save copy of Global Data pointer */
813 mr r10, r5 /* Save copy of Destination Address */
816 mr r3, r5 /* Destination Address */
817 lis r4, CONFIG_SYS_MONITOR_BASE@h /* Source Address */
818 ori r4, r4, CONFIG_SYS_MONITOR_BASE@l
819 lwz r5, GOT(__bss_start)
821 li r6, CONFIG_SYS_CACHELINE_SIZE /* Cache Line Size */
826 * New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE)
827 * + Destination Address
833 /* First our own GOT */
835 /* then the one used by the C code */
845 beq cr1,4f /* In place copy is not necessary */
846 beq 7f /* Protect against 0 count */
875 2: slwi r0,r0,2 /* re copy in reverse order ... y do we needed it? */
883 * Now flush the cache: note that we must start from a cache aligned
884 * address. Otherwise we might miss one cache line.
888 beq 7f /* Always flush prefetch queue in any case */
896 sync /* Wait for all dcbst to complete on bus */
902 7: sync /* Wait for all icbi to complete on bus */
906 * We are done. Do not return, instead branch to second part of board
907 * initialization, now running from RAM.
909 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
916 * Relocation Function, r12 point to got2+0x8000
918 * Adjust got2 pointers, no need to check for 0, this code
919 * already puts a few entries in the table.
921 li r0,__got2_entries@sectoff@l
922 la r3,GOT(_GOT2_TABLE_)
923 lwz r11,GOT(_GOT2_TABLE_)
936 * Now adjust the fixups and the pointers to the fixups
937 * in case we need to move ourselves again.
939 li r0,__fixup_entries@sectoff@l
940 lwz r3,GOT(_FIXUP_TABLE_)
958 * Now clear BSS segment
960 lwz r3,GOT(__bss_start)
961 lwz r4,GOT(__bss_end)
974 mr r3, r9 /* Global Data pointer */
975 mr r4, r10 /* Destination Address */
980 * Copy exception vector code to low memory
983 * r7: source address, r8: end address, r9: target address
987 mflr r4 /* save link register */
990 lwz r8, GOT(_end_of_vectors)
992 li r9, 0x100 /* reset vector always at 0x100 */
995 bgelr /* return if r7>=r8 - just in case */
1005 * relocate `hdlr' and `int_return' entries
1007 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
1008 li r8, Alignment - _start + EXC_OFF_SYS_RESET
1011 addi r7, r7, 0x100 /* next exception vector */
1015 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
1018 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
1021 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
1022 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
1025 addi r7, r7, 0x100 /* next exception vector */
1029 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
1030 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
1033 addi r7, r7, 0x100 /* next exception vector */
1037 mfmsr r3 /* now that the vectors have */
1038 lis r7, MSR_IP@h /* relocated into low memory */
1039 ori r7, r7, MSR_IP@l /* MSR[IP] can be turned off */
1040 andc r3, r3, r7 /* (if it was on) */
1041 SYNC /* Some chip revs need this... */
1045 mtlr r4 /* restore link register */
1048 #endif /* !MINIMAL_SPL */
1050 #ifdef CONFIG_SYS_INIT_RAM_LOCK
1052 /* Allocate Initial RAM in data cache.
1054 lis r3, (CFG_SYS_INIT_RAM_ADDR & ~31)@h
1055 ori r3, r3, (CFG_SYS_INIT_RAM_ADDR & ~31)@l
1056 li r4, ((CFG_SYS_INIT_RAM_SIZE & ~31) + \
1057 (CFG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
1064 /* Lock the data cache */
1066 ori r0, r0, HID0_DLOCK
1073 .globl unlock_ram_in_cache
1074 unlock_ram_in_cache:
1075 /* invalidate the INIT_RAM section */
1076 lis r3, (CFG_SYS_INIT_RAM_ADDR & ~31)@h
1077 ori r3, r3, (CFG_SYS_INIT_RAM_ADDR & ~31)@l
1078 li r4, ((CFG_SYS_INIT_RAM_SIZE & ~31) + \
1079 (CFG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
1085 sync /* Wait for all icbi to complete on bus */
1088 /* Unlock the data cache and invalidate it */
1090 li r5, HID0_DLOCK|HID0_DCFI
1091 andc r3, r3, r5 /* no invalidate, unlock */
1092 ori r5, r3, HID0_DCFI /* invalidate, unlock */
1094 mtspr HID0, r5 /* invalidate, unlock */
1096 mtspr HID0, r3 /* no invalidate, unlock */
1098 #endif /* !MINIMAL_SPL */
1099 #endif /* CONFIG_SYS_INIT_RAM_LOCK */
1101 #ifdef CFG_SYS_FLASHBOOT
1103 /* When booting from ROM (Flash or EPROM), clear the */
1104 /* Address Mask in OR0 so ROM appears everywhere */
1105 /*----------------------------------------------------*/
1106 lis r3, (CONFIG_SYS_IMMR)@h /* r3 <= CONFIG_SYS_IMMR */
1108 li r5, 0x7fff /* r5 <= 0x00007FFFF */
1110 stw r4, OR0@l(r3) /* OR0 <= OR0 & 0x00007FFFF */
1112 /* As MPC8349E User's Manual presented, when RCW[BMS] is set to 0,
1113 * system will boot from 0x0000_0100, and the LBLAWBAR0[BASE_ADDR]
1114 * reset value is 0x00000; when RCW[BMS] is set to 1, system will boot
1115 * from 0xFFF0_0100, and the LBLAWBAR0[BASE_ADDR] reset value is
1116 * 0xFF800. From the hard resetting to here, the processor fetched and
1117 * executed the instructions one by one. There is not absolutely
1118 * jumping happened. Laterly, the u-boot code has to do an absolutely
1119 * jumping to tell the CPU instruction fetching component what the
1120 * u-boot TEXT base address is. Because the TEXT base resides in the
1121 * boot ROM memory space, to garantee the code can run smoothly after
1122 * that jumping, we must map in the entire boot ROM by Local Access
1123 * Window. Sometimes, we desire an non-0x00000 or non-0xFF800 starting
1124 * address for boot ROM, such as 0xFE000000. In this case, the default
1125 * LBIU Local Access Widow 0 will not cover this memory space. So, we
1126 * need another window to map in it.
1128 lis r4, (CFG_SYS_FLASH_BASE)@h
1129 ori r4, r4, (CFG_SYS_FLASH_BASE)@l
1130 stw r4, LBLAWBAR1(r3) /* LBLAWBAR1 <= CFG_SYS_FLASH_BASE */
1132 /* Store 0x80000012 + log2(CFG_SYS_FLASH_SIZE) into LBLAWAR1 */
1133 lis r4, (0x80000012)@h
1134 ori r4, r4, (0x80000012)@l
1135 li r5, CFG_SYS_FLASH_SIZE
1136 1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */
1140 stw r4, LBLAWAR1(r3) /* LBLAWAR1 <= 8MB Flash Size */
1141 /* Wait for HW to catch up */
1142 lwz r4, LBLAWAR1(r3)
1147 /* Though all the LBIU Local Access Windows and LBC Banks will be
1148 * initialized in the C code, we'd better configure boot ROM's
1149 * window 0 and bank 0 correctly at here.
1151 remap_flash_by_law0:
1152 /* Initialize the BR0 with the boot ROM starting address. */
1156 lis r5, (CFG_SYS_FLASH_BASE & 0xFFFF8000)@h
1157 ori r5, r5, (CFG_SYS_FLASH_BASE & 0xFFFF8000)@l
1159 stw r5, BR0(r3) /* r5 <= (CFG_SYS_FLASH_BASE & 0xFFFF8000) | (BR0 & 0x00007FFF) */
1162 lis r5, ~((CFG_SYS_FLASH_SIZE << 4) - 1)
1166 lis r4, (CFG_SYS_FLASH_BASE)@h
1167 ori r4, r4, (CFG_SYS_FLASH_BASE)@l
1168 stw r4, LBLAWBAR0(r3) /* LBLAWBAR0 <= CFG_SYS_FLASH_BASE */
1170 /* Store 0x80000012 + log2(CFG_SYS_FLASH_SIZE) into LBLAWAR0 */
1171 lis r4, (0x80000012)@h
1172 ori r4, r4, (0x80000012)@l
1173 li r5, CFG_SYS_FLASH_SIZE
1174 1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */
1177 stw r4, LBLAWAR0(r3) /* LBLAWAR0 <= Flash Size */
1181 stw r4, LBLAWBAR1(r3)
1182 stw r4, LBLAWAR1(r3) /* Off LBIU LAW1 */
1183 /* Wait for HW to catch up */
1184 lwz r4, LBLAWAR1(r3)
1188 #endif /* CFG_SYS_FLASHBOOT */