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u-boot/cpu/mpc85xx/start.S
Kumar Gala 3db0bef59e Use an absolute address when jumping out of 4k boot page 
On e500 when we leave the 4k boot page we should use an absolute address since
we don't know where the board code may want us to be really running at.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2007-08-14 01:45:09 -05:00

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/*
* Copyright 2004, 2007 Freescale Semiconductor.
* Copyright (C) 2003 Motorola,Inc.
*
* 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 Motorola 85xx PowerPC based Embedded Boards
*
* The processor starts at 0xfffffffc and the code is first executed in the
* last 4K page(0xfffff000-0xffffffff) in flash/rom.
*
*/
#include <config.h>
#include <mpc85xx.h>
#include <version.h>
#define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
#include <ppc_asm.tmpl>
#include <ppc_defs.h>
#include <asm/cache.h>
#include <asm/mmu.h>
#ifndef CONFIG_IDENT_STRING
#define CONFIG_IDENT_STRING ""
#endif
#undef MSR_KERNEL
#define MSR_KERNEL ( MSR_ME ) /* Machine Check */
/*
* 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
/*
* e500 Startup -- after reset only the last 4KB of the effective
* address space is mapped in the MMU L2 TLB1 Entry0. The .bootpg
* section is located at THIS LAST page and basically does three
* things: clear some registers, set up exception tables and
* add more TLB entries for 'larger spaces'(e.g. the boot rom) to
* continue the boot procedure.
* Once the boot rom is mapped by TLB entries we can proceed
* with normal startup.
*
*/
.section .bootpg,"ax"
.globl _start_e500
_start_e500:
/* clear registers/arrays not reset by hardware */
/* L1 */
li r0,2
mtspr L1CSR0,r0 /* invalidate d-cache */
mtspr L1CSR1,r0 /* invalidate i-cache */
mfspr r1,DBSR
mtspr DBSR,r1 /* Clear all valid bits */
/*
* Enable L1 Caches early
*
*/
lis r2,L1CSR0_CPE@H /* enable parity */
ori r2,r2,L1CSR0_DCE
mtspr L1CSR0,r2 /* enable L1 Dcache */
isync
mtspr L1CSR1,r2 /* enable L1 Icache */
isync
msync
/* Setup interrupt vectors */
lis r1,TEXT_BASE@h
mtspr IVPR,r1
li r1,0x0100
mtspr IVOR0,r1 /* 0: Critical input */
li r1,0x0200
mtspr IVOR1,r1 /* 1: Machine check */
li r1,0x0300
mtspr IVOR2,r1 /* 2: Data storage */
li r1,0x0400
mtspr IVOR3,r1 /* 3: Instruction storage */
li r1,0x0500
mtspr IVOR4,r1 /* 4: External interrupt */
li r1,0x0600
mtspr IVOR5,r1 /* 5: Alignment */
li r1,0x0700
mtspr IVOR6,r1 /* 6: Program check */
li r1,0x0800
mtspr IVOR7,r1 /* 7: floating point unavailable */
li r1,0x0900
mtspr IVOR8,r1 /* 8: System call */
/* 9: Auxiliary processor unavailable(unsupported) */
li r1,0x0a00
mtspr IVOR10,r1 /* 10: Decrementer */
li r1,0x0b00
mtspr IVOR11,r1 /* 11: Interval timer */
li r1,0x0c00
mtspr IVOR12,r1 /* 12: Watchdog timer */
li r1,0x0d00
mtspr IVOR13,r1 /* 13: Data TLB error */
li r1,0x0e00
mtspr IVOR14,r1 /* 14: Instruction TLB error */
li r1,0x0f00
mtspr IVOR15,r1 /* 15: Debug */
/*
* After reset, CCSRBAR is located at CFG_CCSRBAR_DEFAULT, i.e.
* 0xff700000-0xff800000. We need add a TLB1 entry for this 1MB
* region before we can access any CCSR registers such as L2
* registers, Local Access Registers,etc. We will also re-allocate
* CFG_CCSRBAR_DEFAULT to CFG_CCSRBAR immediately after TLB1 setup.
*
* Please refer to board-specif directory for TLB1 entry configuration.
* (e.g. board/<yourboard>/init.S)
*
*/
bl tlb1_entry
mr r5,r0
lwzu r4,0(r5) /* how many TLB1 entries we actually use */
mtctr r4
0: lwzu r6,4(r5)
lwzu r7,4(r5)
lwzu r8,4(r5)
lwzu r9,4(r5)
mtspr MAS0,r6
mtspr MAS1,r7
mtspr MAS2,r8
mtspr MAS3,r9
isync
msync
tlbwe
isync
bdnz 0b
1:
#if (CFG_CCSRBAR_DEFAULT != CFG_CCSRBAR)
/* Special sequence needed to update CCSRBAR itself */
lis r4,CFG_CCSRBAR_DEFAULT@h
ori r4,r4,CFG_CCSRBAR_DEFAULT@l
lis r5,CFG_CCSRBAR@h
ori r5,r5,CFG_CCSRBAR@l
srwi r6,r5,12
stw r6,0(r4)
isync
lis r5,0xffff
ori r5,r5,0xf000
lwz r5,0(r5)
isync
lis r3,CFG_CCSRBAR@h
lwz r5,CFG_CCSRBAR@l(r3)
isync
#endif
/* set up local access windows, defined at board/<boardname>/init.S */
lis r7,CFG_CCSRBAR@h
ori r7,r7,CFG_CCSRBAR@l
bl law_entry
mr r6,r0
lwzu r5,0(r6) /* how many windows we actually use */
mtctr r5
li r2,0x0c28 /* the first pair is reserved for */
li r1,0x0c30 /* boot-over-rio-or-pci */
0: lwzu r4,4(r6)
lwzu r3,4(r6)
stwx r4,r7,r2
stwx r3,r7,r1
addi r2,r2,0x0020
addi r1,r1,0x0020
bdnz 0b
/* Clear and set up some registers. */
li r0,0x0000
lis r1,0xffff
mtspr DEC,r0 /* prevent dec exceptions */
mttbl r0 /* prevent fit & wdt exceptions */
mttbu r0
mtspr TSR,r1 /* clear all timer exception status */
mtspr TCR,r0 /* disable all */
mtspr ESR,r0 /* clear exception syndrome register */
mtspr MCSR,r0 /* machine check syndrome register */
mtxer r0 /* clear integer exception register */
lis r1,0x0002 /* set CE bit (Critical Exceptions) */
ori r1,r1,0x1200 /* set ME/DE bit */
mtmsr r1 /* change MSR */
isync
/* Enable Time Base and Select Time Base Clock */
lis r0,HID0_EMCP@h /* Enable machine check */
#if defined(CONFIG_ENABLE_36BIT_PHYS)
ori r0,r0,(HID0_TBEN|HID0_ENMAS7)@l /* Enable Timebase & MAS7 */
#else
ori r0,r0,HID0_TBEN@l /* enable Timebase */
#endif
mtspr HID0,r0
li r0,(HID1_ASTME|HID1_ABE)@l /* Addr streaming & broadcast */
mtspr HID1,r0
/* Enable Branch Prediction */
#if defined(CONFIG_BTB)
li r0,0x201 /* BBFI = 1, BPEN = 1 */
mtspr BUCSR,r0
#endif
#if defined(CFG_INIT_DBCR)
lis r1,0xffff
ori r1,r1,0xffff
mtspr DBSR,r1 /* Clear all status bits */
lis r0,CFG_INIT_DBCR@h /* DBCR0[IDM] must be set */
ori r0,r0,CFG_INIT_DBCR@l
mtspr DBCR0,r0
#endif
/* L1 DCache is used for initial RAM */
/* Allocate Initial RAM in data cache.
*/
lis r3,CFG_INIT_RAM_ADDR@h
ori r3,r3,CFG_INIT_RAM_ADDR@l
li r2,512 /* 512*32=16K */
mtctr r2
li r0,0
1:
dcbz r0,r3
dcbtls 0,r0,r3
addi r3,r3,32
bdnz 1b
/* Jump out the last 4K page and continue to 'normal' start */
#ifdef CFG_RAMBOOT
bl 3f
b _start_cont
#else
/* Calculate absolute address in FLASH and jump there */
/*--------------------------------------------------------------*/
lis r3,CFG_MONITOR_BASE@h
ori r3,r3,CFG_MONITOR_BASE@l
addi r3,r3,_start_cont - _start + _START_OFFSET
mtlr r3
#endif
3: li r0,0
mtspr SRR1,r0 /* Keep things disabled for now */
mflr r1
mtspr SRR0,r1
rfi
isync
.text
.globl _start
_start:
.long 0x27051956 /* U-BOOT Magic Number */
.globl version_string
version_string:
.ascii U_BOOT_VERSION
.ascii " (", __DATE__, " - ", __TIME__, ")"
.ascii CONFIG_IDENT_STRING, "\0"
.align 4
.globl _start_cont
_start_cont:
/* Setup the stack in initial RAM,could be L2-as-SRAM or L1 dcache*/
lis r1,CFG_INIT_RAM_ADDR@h
ori r1,r1,CFG_INIT_SP_OFFSET@l
li r0,0
stwu r0,-4(r1)
stwu r0,-4(r1) /* Terminate call chain */
stwu r1,-8(r1) /* Save back chain and move SP */
lis r0,RESET_VECTOR@h /* Address of reset vector */
ori r0,r0,RESET_VECTOR@l
stwu r1,-8(r1) /* Save back chain and move SP */
stw r0,+12(r1) /* Save return addr (underflow vect) */
GET_GOT
bl cpu_init_f
bl board_init_f
isync
. = EXC_OFF_SYS_RESET
.globl _start_of_vectors
_start_of_vectors:
/* Critical input. */
CRIT_EXCEPTION(0x0100, CriticalInput, CritcalInputException)
/* Machine check */
MCK_EXCEPTION(0x200, MachineCheck, MachineCheckException)
/* Data Storage exception. */
STD_EXCEPTION(0x0300, DataStorage, UnknownException)
/* Instruction Storage exception. */
STD_EXCEPTION(0x0400, InstStorage, UnknownException)
/* External Interrupt exception. */
STD_EXCEPTION(0x0500, ExtInterrupt, ExtIntException)
/* Alignment exception. */
. = 0x0600
Alignment:
EXCEPTION_PROLOG(SRR0, SRR1)
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 + _START_OFFSET
.long int_return - _start + _START_OFFSET
/* Program check exception */
. = 0x0700
ProgramCheck:
EXCEPTION_PROLOG(SRR0, SRR1)
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 + _START_OFFSET
.long int_return - _start + _START_OFFSET
/* No FPU on MPC85xx. This exception is not supposed to happen.
*/
STD_EXCEPTION(0x0800, FPUnavailable, UnknownException)
. = 0x0900
/*
* r0 - SYSCALL number
* r3-... arguments
*/
SystemCall:
addis r11,r0,0 /* get functions table addr */
ori r11,r11,0 /* Note: this code is patched in trap_init */
addis r12,r0,0 /* get number of functions */
ori r12,r12,0
cmplw 0,r0,r12
bge 1f
rlwinm r0,r0,2,0,31 /* fn_addr = fn_tbl[r0] */
add r11,r11,r0
lwz r11,0(r11)
li r20,0xd00-4 /* Get stack pointer */
lwz r12,0(r20)
subi r12,r12,12 /* Adjust stack pointer */
li r0,0xc00+_end_back-SystemCall
cmplw 0,r0,r12 /* Check stack overflow */
bgt 1f
stw r12,0(r20)
mflr r0
stw r0,0(r12)
mfspr r0,SRR0
stw r0,4(r12)
mfspr r0,SRR1
stw r0,8(r12)
li r12,0xc00+_back-SystemCall
mtlr r12
mtspr SRR0,r11
1: SYNC
rfi
_back:
mfmsr r11 /* Disable interrupts */
li r12,0
ori r12,r12,MSR_EE
andc r11,r11,r12
SYNC /* Some chip revs need this... */
mtmsr r11
SYNC
li r12,0xd00-4 /* restore regs */
lwz r12,0(r12)
lwz r11,0(r12)
mtlr r11
lwz r11,4(r12)
mtspr SRR0,r11
lwz r11,8(r12)
mtspr SRR1,r11
addi r12,r12,12 /* Adjust stack pointer */
li r20,0xd00-4
stw r12,0(r20)
SYNC
rfi
_end_back:
STD_EXCEPTION(0x0a00, Decrementer, timer_interrupt)
STD_EXCEPTION(0x0b00, IntervalTimer, UnknownException)
STD_EXCEPTION(0x0c00, WatchdogTimer, UnknownException)
STD_EXCEPTION(0x0d00, DataTLBError, UnknownException)
STD_EXCEPTION(0x0e00, InstructionTLBError, UnknownException)
CRIT_EXCEPTION(0x0f00, DebugBreakpoint, DebugException )
.globl _end_of_vectors
_end_of_vectors:
. = . + (0x100 - ( . & 0xff )) /* align for debug */
/*
* 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
crit_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 SPRN_CSRR0,r2
mtspr SPRN_CSRR1,r0
lwz r0,GPR0(r1)
lwz r2,GPR2(r1)
lwz r1,GPR1(r1)
SYNC
rfci
mck_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 SPRN_MCSRR0,r2
mtspr SPRN_MCSRR1,r0
lwz r0,GPR0(r1)
lwz r2,GPR2(r1)
lwz r1,GPR1(r1)
SYNC
rfmci
/* Cache functions.
*/
invalidate_icache:
mfspr r0,L1CSR1
ori r0,r0,L1CSR1_ICFI
msync
isync
mtspr L1CSR1,r0
isync
blr /* entire I cache */
invalidate_dcache:
mfspr r0,L1CSR0
ori r0,r0,L1CSR0_DCFI
msync
isync
mtspr L1CSR0,r0
isync
blr
.globl icache_enable
icache_enable:
mflr r8
bl invalidate_icache
mtlr r8
isync
mfspr r4,L1CSR1
ori r4,r4,0x0001
oris r4,r4,0x0001
mtspr L1CSR1,r4
isync
blr
.globl icache_disable
icache_disable:
mfspr r0,L1CSR1
lis r3,0
ori r3,r3,L1CSR1_ICE
andc r0,r0,r3
mtspr L1CSR1,r0
isync
blr
.globl icache_status
icache_status:
mfspr r3,L1CSR1
andi. r3,r3,L1CSR1_ICE
blr
.globl dcache_enable
dcache_enable:
mflr r8
bl invalidate_dcache
mtlr r8
isync
mfspr r0,L1CSR0
ori r0,r0,0x0001
oris r0,r0,0x0001
msync
isync
mtspr L1CSR0,r0
isync
blr
.globl dcache_disable
dcache_disable:
mfspr r3,L1CSR0
lis r4,0
ori r4,r4,L1CSR0_DCE
andc r3,r3,r4
mtspr L1CSR0,r0
isync
blr
.globl dcache_status
dcache_status:
mfspr r3,L1CSR0
andi. r3,r3,L1CSR0_DCE
blr
.globl get_pir
get_pir:
mfspr r3,PIR
blr
.globl get_pvr
get_pvr:
mfspr r3,PVR
blr
.globl get_svr
get_svr:
mfspr r3,SVR
blr
.globl wr_tcr
wr_tcr:
mtspr TCR,r3
blr
/*------------------------------------------------------------------------------- */
/* Function: in8 */
/* Description: Input 8 bits */
/*------------------------------------------------------------------------------- */
.globl in8
in8:
lbz r3,0x0000(r3)
blr
/*------------------------------------------------------------------------------- */
/* Function: out8 */
/* Description: Output 8 bits */
/*------------------------------------------------------------------------------- */
.globl out8
out8:
stb r4,0x0000(r3)
blr
/*------------------------------------------------------------------------------- */
/* Function: out16 */
/* Description: Output 16 bits */
/*------------------------------------------------------------------------------- */
.globl out16
out16:
sth r4,0x0000(r3)
blr
/*------------------------------------------------------------------------------- */
/* Function: out16r */
/* Description: Byte reverse and output 16 bits */
/*------------------------------------------------------------------------------- */
.globl out16r
out16r:
sthbrx r4,r0,r3
blr
/*------------------------------------------------------------------------------- */
/* Function: out32 */
/* Description: Output 32 bits */
/*------------------------------------------------------------------------------- */
.globl out32
out32:
stw r4,0x0000(r3)
blr
/*------------------------------------------------------------------------------- */
/* Function: out32r */
/* Description: Byte reverse and output 32 bits */
/*------------------------------------------------------------------------------- */
.globl out32r
out32r:
stwbrx r4,r0,r3
blr
/*------------------------------------------------------------------------------- */
/* Function: in16 */
/* Description: Input 16 bits */
/*------------------------------------------------------------------------------- */
.globl in16
in16:
lhz r3,0x0000(r3)
blr
/*------------------------------------------------------------------------------- */
/* Function: in16r */
/* Description: Input 16 bits and byte reverse */
/*------------------------------------------------------------------------------- */
.globl in16r
in16r:
lhbrx r3,r0,r3
blr
/*------------------------------------------------------------------------------- */
/* Function: in32 */
/* Description: Input 32 bits */
/*------------------------------------------------------------------------------- */
.globl in32
in32:
lwz 3,0x0000(3)
blr
/*------------------------------------------------------------------------------- */
/* Function: in32r */
/* Description: Input 32 bits and byte reverse */
/*------------------------------------------------------------------------------- */
.globl in32r
in32r:
lwbrx r3,r0,r3
blr
/*------------------------------------------------------------------------------- */
/* Function: ppcDcbf */
/* Description: Data Cache block flush */
/* Input: r3 = effective address */
/* Output: none. */
/*------------------------------------------------------------------------------- */
.globl ppcDcbf
ppcDcbf:
dcbf r0,r3
blr
/*------------------------------------------------------------------------------- */
/* Function: ppcDcbi */
/* Description: Data Cache block Invalidate */
/* Input: r3 = effective address */
/* Output: none. */
/*------------------------------------------------------------------------------- */
.globl ppcDcbi
ppcDcbi:
dcbi r0,r3
blr
/*--------------------------------------------------------------------------
* Function: ppcDcbz
* Description: Data Cache block zero.
* Input: r3 = effective address
* Output: none.
*-------------------------------------------------------------------------- */
.globl ppcDcbz
ppcDcbz:
dcbz r0,r3
blr
/*------------------------------------------------------------------------------- */
/* Function: ppcSync */
/* Description: Processor Synchronize */
/* Input: none. */
/* Output: none. */
/*------------------------------------------------------------------------------- */
.globl ppcSync
ppcSync:
sync
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 Init 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
/* the the one used by the C code */
add r30,r30,r15
/*
* Now relocate code
*/
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
/*
* 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
/*
* Re-point the IVPR at RAM
*/
mtspr IVPR,r10
/*
* We are done. Do not return, instead branch to second part of board
* initialization, now running from RAM.
*/
addi r0,r10,in_ram - _start + _START_OFFSET
mtlr r0
blr /* NEVER RETURNS! */
.globl in_ram
in_ram:
/*
* 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,r9 /* Init Data pointer */
mr r4,r10 /* Destination Address */
bl board_init_r
/*
* 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_of_vectors)
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_CriticalInput - _start + _START_OFFSET
bl trap_reloc
li r7,.L_MachineCheck - _start + _START_OFFSET
bl trap_reloc
li r7,.L_DataStorage - _start + _START_OFFSET
bl trap_reloc
li r7,.L_InstStorage - _start + _START_OFFSET
bl trap_reloc
li r7,.L_ExtInterrupt - _start + _START_OFFSET
bl trap_reloc
li r7,.L_Alignment - _start + _START_OFFSET
bl trap_reloc
li r7,.L_ProgramCheck - _start + _START_OFFSET
bl trap_reloc
li r7,.L_FPUnavailable - _start + _START_OFFSET
bl trap_reloc
li r7,.L_Decrementer - _start + _START_OFFSET
bl trap_reloc
li r7,.L_IntervalTimer - _start + _START_OFFSET
li r8,_end_of_vectors - _start + _START_OFFSET
2:
bl trap_reloc
addi r7,r7,0x100 /* next exception vector */
cmplw 0,r7,r8
blt 2b
lis r7,0x0
mtspr IVPR,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)
blr
#ifdef CFG_INIT_RAM_LOCK
.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 r4,512
mtctr r4
1: icbi r0,r3
dcbi r0,r3
addi r3,r3,32
bdnz 1b
sync /* Wait for all icbi to complete on bus */
isync
blr
#endif
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