Mirrors/u-boot
2
0
Fork 0
mirror of https://github.com/AsahiLinux/u-boot synced 2024-11-14 08:57:58 +00:00
Code Issues Projects Releases Packages Wiki Activity
u-boot/cpu/74xx_7xx/start.S
Heiko Schocher f5e0d03970 Add support for wrPPMC7xx/74xx boards 
Patch from Richard Danter, 12 Aug 2005
2006-06-19 11:02:41 +02:00

898 lines
19 KiB
ArmAsm
Raw Blame History

/*
* Copyright (C) 1998 Dan Malek <dmalek@jlc.net>
* Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
* Copyright (C) 2000,2001,2002 Wolfgang Denk <wd@denx.de>
* Copyright (C) 2001 Josh Huber <huber@mclx.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/* U-Boot - Startup Code for PowerPC based Embedded Boards
*
*
* The processor starts at 0xfff00100 and the code is executed
* from flash. The code is organized to be at an other address
* in memory, but as long we don't jump around before relocating.
* board_init lies at a quite high address and when the cpu has
* jumped there, everything is ok.
*/
#include <config.h>
#include <74xx_7xx.h>
#include <version.h>
#include <ppc_asm.tmpl>
#include <ppc_defs.h>
#include <asm/cache.h>
#include <asm/mmu.h>
#if !defined(CONFIG_DB64360) && \
!defined(CONFIG_DB64460) && \
!defined(CONFIG_CPCI750)
#include <galileo/gt64260R.h>
#endif
#ifndef CONFIG_IDENT_STRING
#define CONFIG_IDENT_STRING ""
#endif
/* We don't want the MMU yet.
*/
#undef MSR_KERNEL
/* Machine Check and Recoverable Interr. */
#define MSR_KERNEL ( MSR_ME | MSR_RI )
/*
* Set up GOT: Global Offset Table
*
* Use r14 to access the GOT
*/
START_GOT
GOT_ENTRY(_GOT2_TABLE_)
GOT_ENTRY(_FIXUP_TABLE_)
GOT_ENTRY(_start)
GOT_ENTRY(_start_of_vectors)
GOT_ENTRY(_end_of_vectors)
GOT_ENTRY(transfer_to_handler)
GOT_ENTRY(__init_end)
GOT_ENTRY(_end)
GOT_ENTRY(__bss_start)
END_GOT
/*
* r3 - 1st arg to board_init(): IMMP pointer
* r4 - 2nd arg to board_init(): boot flag
*/
.text
.long 0x27051956 /* U-Boot Magic Number */
.globl version_string
version_string:
.ascii U_BOOT_VERSION
.ascii " (", __DATE__, " - ", __TIME__, ")"
.ascii CONFIG_IDENT_STRING, "\0"
. = EXC_OFF_SYS_RESET
.globl _start
_start:
li r21, BOOTFLAG_COLD /* Normal Power-On: Boot from FLASH */
b boot_cold
sync
. = EXC_OFF_SYS_RESET + 0x10
.globl _start_warm
_start_warm:
li r21, BOOTFLAG_WARM /* Software reboot */
b boot_warm
sync
/* the boot code is located below the exception table */
.globl _start_of_vectors
_start_of_vectors:
/* Machine check */
STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
/* Data Storage exception. "Never" generated on the 860. */
STD_EXCEPTION(0x300, DataStorage, UnknownException)
/* Instruction Storage exception. "Never" generated on the 860. */
STD_EXCEPTION(0x400, InstStorage, UnknownException)
/* External Interrupt exception. */
STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
/* Alignment exception. */
. = 0x600
Alignment:
EXCEPTION_PROLOG
mfspr r4,DAR
stw r4,_DAR(r21)
mfspr r5,DSISR
stw r5,_DSISR(r21)
addi r3,r1,STACK_FRAME_OVERHEAD
li r20,MSR_KERNEL
rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
lwz r6,GOT(transfer_to_handler)
mtlr r6
blrl
.L_Alignment:
.long AlignmentException - _start + EXC_OFF_SYS_RESET
.long int_return - _start + EXC_OFF_SYS_RESET
/* Program check exception */
. = 0x700
ProgramCheck:
EXCEPTION_PROLOG
addi r3,r1,STACK_FRAME_OVERHEAD
li r20,MSR_KERNEL
rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
lwz r6,GOT(transfer_to_handler)
mtlr r6
blrl
.L_ProgramCheck:
.long ProgramCheckException - _start + EXC_OFF_SYS_RESET
.long int_return - _start + EXC_OFF_SYS_RESET
/* No FPU on MPC8xx. This exception is not supposed to happen.
*/
STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
/* I guess we could implement decrementer, and may have
* to someday for timekeeping.
*/
STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
STD_EXCEPTION(0xc00, SystemCall, UnknownException)
STD_EXCEPTION(0xd00, SingleStep, UnknownException)
STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
/*
* On the MPC8xx, this is a software emulation interrupt. It
* occurs for all unimplemented and illegal instructions.
*/
STD_EXCEPTION(0x1000, SoftEmu, SoftEmuException)
STD_EXCEPTION(0x1100, InstructionTLBMiss, UnknownException)
STD_EXCEPTION(0x1200, DataTLBMiss, UnknownException)
STD_EXCEPTION(0x1300, InstructionTLBError, UnknownException)
STD_EXCEPTION(0x1400, DataTLBError, UnknownException)
STD_EXCEPTION(0x1500, Reserved5, UnknownException)
STD_EXCEPTION(0x1600, Reserved6, UnknownException)
STD_EXCEPTION(0x1700, Reserved7, UnknownException)
STD_EXCEPTION(0x1800, Reserved8, UnknownException)
STD_EXCEPTION(0x1900, Reserved9, UnknownException)
STD_EXCEPTION(0x1a00, ReservedA, UnknownException)
STD_EXCEPTION(0x1b00, ReservedB, UnknownException)
STD_EXCEPTION(0x1c00, DataBreakpoint, UnknownException)
STD_EXCEPTION(0x1d00, InstructionBreakpoint, UnknownException)
STD_EXCEPTION(0x1e00, PeripheralBreakpoint, UnknownException)
STD_EXCEPTION(0x1f00, DevPortBreakpoint, UnknownException)
.globl _end_of_vectors
_end_of_vectors:
. = 0x2000
boot_cold:
boot_warm:
/* disable everything */
li r0, 0
mtspr HID0, r0
sync
mtmsr 0
bl invalidate_bats
sync
#ifdef CFG_L2
/* init the L2 cache */
addis r3, r0, L2_INIT@h
ori r3, r3, L2_INIT@l
sync
mtspr l2cr, r3
#endif
#if defined(CONFIG_ALTIVEC) && defined(CONFIG_74xx)
.long 0x7e00066c
/*
* dssall instruction, gas doesn't have it yet
* ...for altivec, data stream stop all this probably
* isn't needed unless we warm (software) reboot U-Boot
*/
#endif
#ifdef CFG_L2
/* invalidate the L2 cache */
bl l2cache_invalidate
sync
#endif
#ifdef CFG_BOARD_ASM_INIT
/* do early init */
bl board_asm_init
#endif
/*
* Calculate absolute address in FLASH and jump there
*------------------------------------------------------*/
lis r3, CFG_MONITOR_BASE@h
ori r3, r3, CFG_MONITOR_BASE@l
addi r3, r3, in_flash - _start + EXC_OFF_SYS_RESET
mtlr r3
blr
in_flash:
/* let the C-code set up the rest */
/* */
/* Be careful to keep code relocatable ! */
/*------------------------------------------------------*/
/* perform low-level init */
/* sdram init, galileo init, etc */
/* r3: NHR bit from HID0 */
/* setup the bats */
bl setup_bats
sync
/*
* Cache must be enabled here for stack-in-cache trick.
* This means we need to enable the BATS.
* This means:
* 1) for the EVB, original gt regs need to be mapped
* 2) need to have an IBAT for the 0xf region,
* we are running there!
* Cache should be turned on after BATs, since by default
* everything is write-through.
* The init-mem BAT can be reused after reloc. The old
* gt-regs BAT can be reused after board_init_f calls
* board_early_init_f (EVB only).
*/
#if !defined(CONFIG_BAB7xx) && !defined(CONFIG_ELPPC)
/* enable address translation */
bl enable_addr_trans
sync
/* enable and invalidate the data cache */
bl l1dcache_enable
sync
#endif
#ifdef CFG_INIT_RAM_LOCK
bl lock_ram_in_cache
sync
#endif
/* set up the stack pointer in our newly created
* cache-ram (r1) */
lis r1, (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET)@h
ori r1, r1, (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET)@l
li r0, 0 /* Make room for stack frame header and */
stwu r0, -4(r1) /* clear final stack frame so that */
stwu r0, -4(r1) /* stack backtraces terminate cleanly */
GET_GOT /* initialize GOT access */
/* run low-level CPU init code (from Flash) */
bl cpu_init_f
sync
mr r3, r21
/* r3: BOOTFLAG */
/* run 1st part of board init code (from Flash) */
bl board_init_f
sync
/* NOTREACHED */
.globl invalidate_bats
invalidate_bats:
/* invalidate BATs */
mtspr IBAT0U, r0
mtspr IBAT1U, r0
mtspr IBAT2U, r0
mtspr IBAT3U, r0
#ifdef CONFIG_750FX
mtspr IBAT4U, r0
mtspr IBAT5U, r0
mtspr IBAT6U, r0
mtspr IBAT7U, r0
#endif
isync
mtspr DBAT0U, r0
mtspr DBAT1U, r0
mtspr DBAT2U, r0
mtspr DBAT3U, r0
#ifdef CONFIG_750FX
mtspr DBAT4U, r0
mtspr DBAT5U, r0
mtspr DBAT6U, r0
mtspr DBAT7U, r0
#endif
isync
sync
blr
/* setup_bats - set them up to some initial state */
.globl setup_bats
setup_bats:
addis r0, r0, 0x0000
/* IBAT 0 */
addis r4, r0, CFG_IBAT0L@h
ori r4, r4, CFG_IBAT0L@l
addis r3, r0, CFG_IBAT0U@h
ori r3, r3, CFG_IBAT0U@l
mtspr IBAT0L, r4
mtspr IBAT0U, r3
isync
/* DBAT 0 */
addis r4, r0, CFG_DBAT0L@h
ori r4, r4, CFG_DBAT0L@l
addis r3, r0, CFG_DBAT0U@h
ori r3, r3, CFG_DBAT0U@l
mtspr DBAT0L, r4
mtspr DBAT0U, r3
isync
/* IBAT 1 */
addis r4, r0, CFG_IBAT1L@h
ori r4, r4, CFG_IBAT1L@l
addis r3, r0, CFG_IBAT1U@h
ori r3, r3, CFG_IBAT1U@l
mtspr IBAT1L, r4
mtspr IBAT1U, r3
isync
/* DBAT 1 */
addis r4, r0, CFG_DBAT1L@h
ori r4, r4, CFG_DBAT1L@l
addis r3, r0, CFG_DBAT1U@h
ori r3, r3, CFG_DBAT1U@l
mtspr DBAT1L, r4
mtspr DBAT1U, r3
isync
/* IBAT 2 */
addis r4, r0, CFG_IBAT2L@h
ori r4, r4, CFG_IBAT2L@l
addis r3, r0, CFG_IBAT2U@h
ori r3, r3, CFG_IBAT2U@l
mtspr IBAT2L, r4
mtspr IBAT2U, r3
isync
/* DBAT 2 */
addis r4, r0, CFG_DBAT2L@h
ori r4, r4, CFG_DBAT2L@l
addis r3, r0, CFG_DBAT2U@h
ori r3, r3, CFG_DBAT2U@l
mtspr DBAT2L, r4
mtspr DBAT2U, r3
isync
/* IBAT 3 */
addis r4, r0, CFG_IBAT3L@h
ori r4, r4, CFG_IBAT3L@l
addis r3, r0, CFG_IBAT3U@h
ori r3, r3, CFG_IBAT3U@l
mtspr IBAT3L, r4
mtspr IBAT3U, r3
isync
/* DBAT 3 */
addis r4, r0, CFG_DBAT3L@h
ori r4, r4, CFG_DBAT3L@l
addis r3, r0, CFG_DBAT3U@h
ori r3, r3, CFG_DBAT3U@l
mtspr DBAT3L, r4
mtspr DBAT3U, r3
isync
#ifdef CONFIG_750FX
/* IBAT 4 */
addis r4, r0, CFG_IBAT4L@h
ori r4, r4, CFG_IBAT4L@l
addis r3, r0, CFG_IBAT4U@h
ori r3, r3, CFG_IBAT4U@l
mtspr IBAT4L, r4
mtspr IBAT4U, r3
isync
/* DBAT 4 */
addis r4, r0, CFG_DBAT4L@h
ori r4, r4, CFG_DBAT4L@l
addis r3, r0, CFG_DBAT4U@h
ori r3, r3, CFG_DBAT4U@l
mtspr DBAT4L, r4
mtspr DBAT4U, r3
isync
/* IBAT 5 */
addis r4, r0, CFG_IBAT5L@h
ori r4, r4, CFG_IBAT5L@l
addis r3, r0, CFG_IBAT5U@h
ori r3, r3, CFG_IBAT5U@l
mtspr IBAT5L, r4
mtspr IBAT5U, r3
isync
/* DBAT 5 */
addis r4, r0, CFG_DBAT5L@h
ori r4, r4, CFG_DBAT5L@l
addis r3, r0, CFG_DBAT5U@h
ori r3, r3, CFG_DBAT5U@l
mtspr DBAT5L, r4
mtspr DBAT5U, r3
isync
/* IBAT 6 */
addis r4, r0, CFG_IBAT6L@h
ori r4, r4, CFG_IBAT6L@l
addis r3, r0, CFG_IBAT6U@h
ori r3, r3, CFG_IBAT6U@l
mtspr IBAT6L, r4
mtspr IBAT6U, r3
isync
/* DBAT 6 */
addis r4, r0, CFG_DBAT6L@h
ori r4, r4, CFG_DBAT6L@l
addis r3, r0, CFG_DBAT6U@h
ori r3, r3, CFG_DBAT6U@l
mtspr DBAT6L, r4
mtspr DBAT6U, r3
isync
/* IBAT 7 */
addis r4, r0, CFG_IBAT7L@h
ori r4, r4, CFG_IBAT7L@l
addis r3, r0, CFG_IBAT7U@h
ori r3, r3, CFG_IBAT7U@l
mtspr IBAT7L, r4
mtspr IBAT7U, r3
isync
/* DBAT 7 */
addis r4, r0, CFG_DBAT7L@h
ori r4, r4, CFG_DBAT7L@l
addis r3, r0, CFG_DBAT7U@h
ori r3, r3, CFG_DBAT7U@l
mtspr DBAT7L, r4
mtspr DBAT7U, r3
isync
#endif
/* bats are done, now invalidate the TLBs */
addis r3, 0, 0x0000
addis r5, 0, 0x4 /* upper bound of 0x00040000 for 7400/750 */
isync
tlblp:
tlbie r3
sync
addi r3, r3, 0x1000
cmp 0, 0, r3, r5
blt tlblp
blr
.globl enable_addr_trans
enable_addr_trans:
/* enable address translation */
mfmsr r5
ori r5, r5, (MSR_IR | MSR_DR)
mtmsr r5
isync
blr
.globl disable_addr_trans
disable_addr_trans:
/* disable address translation */
mflr r4
mfmsr r3
andi. r0, r3, (MSR_IR | MSR_DR)
beqlr
andc r3, r3, r0
mtspr SRR0, r4
mtspr SRR1, r3
rfi
/*
* This code finishes saving the registers to the exception frame
* and jumps to the appropriate handler for the exception.
* Register r21 is pointer into trap frame, r1 has new stack pointer.
*/
.globl transfer_to_handler
transfer_to_handler:
stw r22,_NIP(r21)
lis r22,MSR_POW@h
andc r23,r23,r22
stw r23,_MSR(r21)
SAVE_GPR(7, r21)
SAVE_4GPRS(8, r21)
SAVE_8GPRS(12, r21)
SAVE_8GPRS(24, r21)
mflr r23
andi. r24,r23,0x3f00 /* get vector offset */
stw r24,TRAP(r21)
li r22,0
stw r22,RESULT(r21)
mtspr SPRG2,r22 /* r1 is now kernel sp */
lwz r24,0(r23) /* virtual address of handler */
lwz r23,4(r23) /* where to go when done */
mtspr SRR0,r24
mtspr SRR1,r20
mtlr r23
SYNC
rfi /* jump to handler, enable MMU */
int_return:
mfmsr r28 /* Disable interrupts */
li r4,0
ori r4,r4,MSR_EE
andc r28,r28,r4
SYNC /* Some chip revs need this... */
mtmsr r28
SYNC
lwz r2,_CTR(r1)
lwz r0,_LINK(r1)
mtctr r2
mtlr r0
lwz r2,_XER(r1)
lwz r0,_CCR(r1)
mtspr XER,r2
mtcrf 0xFF,r0
REST_10GPRS(3, r1)
REST_10GPRS(13, r1)
REST_8GPRS(23, r1)
REST_GPR(31, r1)
lwz r2,_NIP(r1) /* Restore environment */
lwz r0,_MSR(r1)
mtspr SRR0,r2
mtspr SRR1,r0
lwz r0,GPR0(r1)
lwz r2,GPR2(r1)
lwz r1,GPR1(r1)
SYNC
rfi
.globl dc_read
dc_read:
blr
.globl get_pvr
get_pvr:
mfspr r3, PVR
blr
/*-----------------------------------------------------------------------*/
/*
* void relocate_code (addr_sp, gd, addr_moni)
*
* This "function" does not return, instead it continues in RAM
* after relocating the monitor code.
*
* r3 = dest
* r4 = src
* r5 = length in bytes
* r6 = cachelinesize
*/
.globl relocate_code
relocate_code:
mr r1, r3 /* Set new stack pointer */
mr r9, r4 /* Save copy of Global Data pointer */
mr r10, r5 /* Save copy of Destination Address */
mr r3, r5 /* Destination Address */
lis r4, CFG_MONITOR_BASE@h /* Source Address */
ori r4, r4, CFG_MONITOR_BASE@l
lwz r5, GOT(__init_end)
sub r5, r5, r4
li r6, CFG_CACHELINE_SIZE /* Cache Line Size */
/*
* Fix GOT pointer:
*
* New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
*
* Offset:
*/
sub r15, r10, r4
/* First our own GOT */
add r14, r14, r15
/* then the one used by the C code */
add r30, r30, r15
/*
* Now relocate code
*/
#ifdef CONFIG_ECC
bl board_relocate_rom
sync
mr r3, r10 /* Destination Address */
lis r4, CFG_MONITOR_BASE@h /* Source Address */
ori r4, r4, CFG_MONITOR_BASE@l
lwz r5, GOT(__init_end)
sub r5, r5, r4
li r6, CFG_CACHELINE_SIZE /* Cache Line Size */
#else
cmplw cr1,r3,r4
addi r0,r5,3
srwi. r0,r0,2
beq cr1,4f /* In place copy is not necessary */
beq 7f /* Protect against 0 count */
mtctr r0
bge cr1,2f
la r8,-4(r4)
la r7,-4(r3)
1: lwzu r0,4(r8)
stwu r0,4(r7)
bdnz 1b
b 4f
2: slwi r0,r0,2
add r8,r4,r0
add r7,r3,r0
3: lwzu r0,-4(r8)
stwu r0,-4(r7)
bdnz 3b
#endif
/*
* Now flush the cache: note that we must start from a cache aligned
* address. Otherwise we might miss one cache line.
*/
4: cmpwi r6,0
add r5,r3,r5
beq 7f /* Always flush prefetch queue in any case */
subi r0,r6,1
andc r3,r3,r0
mr r4,r3
5: dcbst 0,r4
add r4,r4,r6
cmplw r4,r5
blt 5b
sync /* Wait for all dcbst to complete on bus */
mr r4,r3
6: icbi 0,r4
add r4,r4,r6
cmplw r4,r5
blt 6b
7: sync /* Wait for all icbi to complete on bus */
isync
/*
* We are done. Do not return, instead branch to second part of board
* initialization, now running from RAM.
*/
addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
mtlr r0
blr
in_ram:
#ifdef CONFIG_ECC
bl board_init_ecc
#endif
/*
* Relocation Function, r14 point to got2+0x8000
*
* Adjust got2 pointers, no need to check for 0, this code
* already puts a few entries in the table.
*/
li r0,__got2_entries@sectoff@l
la r3,GOT(_GOT2_TABLE_)
lwz r11,GOT(_GOT2_TABLE_)
mtctr r0
sub r11,r3,r11
addi r3,r3,-4
1: lwzu r0,4(r3)
add r0,r0,r11
stw r0,0(r3)
bdnz 1b
/*
* Now adjust the fixups and the pointers to the fixups
* in case we need to move ourselves again.
*/
2: li r0,__fixup_entries@sectoff@l
lwz r3,GOT(_FIXUP_TABLE_)
cmpwi r0,0
mtctr r0
addi r3,r3,-4
beq 4f
3: lwzu r4,4(r3)
lwzux r0,r4,r11
add r0,r0,r11
stw r10,0(r3)
stw r0,0(r4)
bdnz 3b
4:
/* clear_bss: */
/*
* Now clear BSS segment
*/
lwz r3,GOT(__bss_start)
lwz r4,GOT(_end)
cmplw 0, r3, r4
beq 6f
li r0, 0
5:
stw r0, 0(r3)
addi r3, r3, 4
cmplw 0, r3, r4
bne 5b
6:
mr r3, r10 /* Destination Address */
#if defined(CONFIG_AMIGAONEG3SE) || \
defined(CONFIG_DB64360) || \
defined(CONFIG_DB64460) || \
defined(CONFIG_CPCI750) || \
defined(CONFIG_PPMC7XX)
mr r4, r9 /* Use RAM copy of the global data */
#endif
bl after_reloc
/* not reached - end relocate_code */
/*-----------------------------------------------------------------------*/
/*
* Copy exception vector code to low memory
*
* r3: dest_addr
* r7: source address, r8: end address, r9: target address
*/
.globl trap_init
trap_init:
lwz r7, GOT(_start)
lwz r8, GOT(_end_of_vectors)
li r9, 0x100 /* reset vector always at 0x100 */
cmplw 0, r7, r8
bgelr /* return if r7>=r8 - just in case */
mflr r4 /* save link register */
1:
lwz r0, 0(r7)
stw r0, 0(r9)
addi r7, r7, 4
addi r9, r9, 4
cmplw 0, r7, r8
bne 1b
/*
* relocate `hdlr' and `int_return' entries
*/
li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
li r8, Alignment - _start + EXC_OFF_SYS_RESET
2:
bl trap_reloc
addi r7, r7, 0x100 /* next exception vector */
cmplw 0, r7, r8
blt 2b
li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
bl trap_reloc
li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
bl trap_reloc
li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
li r8, SystemCall - _start + EXC_OFF_SYS_RESET
3:
bl trap_reloc
addi r7, r7, 0x100 /* next exception vector */
cmplw 0, r7, r8
blt 3b
li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
4:
bl trap_reloc
addi r7, r7, 0x100 /* next exception vector */
cmplw 0, r7, r8
blt 4b
/* enable execptions from RAM vectors */
mfmsr r7
li r8,MSR_IP
andc r7,r7,r8
mtmsr r7
mtlr r4 /* restore link register */
blr
/*
* Function: relocate entries for one exception vector
*/
trap_reloc:
lwz r0, 0(r7) /* hdlr ... */
add r0, r0, r3 /* ... += dest_addr */
stw r0, 0(r7)
lwz r0, 4(r7) /* int_return ... */
add r0, r0, r3 /* ... += dest_addr */
stw r0, 4(r7)
sync
isync
blr
#ifdef CFG_INIT_RAM_LOCK
lock_ram_in_cache:
/* Allocate Initial RAM in data cache.
*/
lis r3, (CFG_INIT_RAM_ADDR & ~31)@h
ori r3, r3, (CFG_INIT_RAM_ADDR & ~31)@l
li r2, ((CFG_INIT_RAM_END & ~31) + \
(CFG_INIT_RAM_ADDR & 31) + 31) / 32
mtctr r2
1:
dcbz r0, r3
addi r3, r3, 32
bdnz 1b
/* Lock the data cache */
mfspr r0, HID0
ori r0, r0, 0x1000
sync
mtspr HID0, r0
sync
blr
.globl unlock_ram_in_cache
unlock_ram_in_cache:
/* invalidate the INIT_RAM section */
lis r3, (CFG_INIT_RAM_ADDR & ~31)@h
ori r3, r3, (CFG_INIT_RAM_ADDR & ~31)@l
li r2, ((CFG_INIT_RAM_END & ~31) + \
(CFG_INIT_RAM_ADDR & 31) + 31) / 32
mtctr r2
1: icbi r0, r3
addi r3, r3, 32
bdnz 1b
sync /* Wait for all icbi to complete on bus */
isync
/* Unlock the data cache and invalidate it */
mfspr r0, HID0
li r3,0x1000
andc r0,r0,r3
li r3,0x0400
or r0,r0,r3
sync
mtspr HID0, r0
sync
blr
#endif
Reference in a new issue View git blame Copy permalink