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u-boot/cpu/mpc85xx/start.S
Wolfgang Denk 99b0d2851a Added support for KwikByte KB920x boards (based on AT91RM9200) 
Patch by Matt ?? <kb9200_dev@kwikbyte.com>, 27 Apr 2005
2005-10-05 00:19:34 +02:00

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/*
* Copyright 2004 Freescale Semiconductor.
* Copyright (C) 2003 Motorola,Inc.
* Xianghua Xiao<X.Xiao@motorola.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 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:
mfspr r0, PVR
lis r1, PVR_85xx_REV1@h
ori r1, r1, PVR_85xx_REV1@l
cmpw r0, r1
bne 1f
/* Semi-bogus errata fixup for Rev 1 */
li r0,0x2000
mtspr 977,r0
/*
* Before invalidating MMU L1/L2, read TLB1 Entry 0 and then
* write it back immediately to fixup a Rev 1 bug (Errata CPU4)
* for this initial TLB1 entry 0, otherwise the TLB1 entry 0
* will be invalidated (incorrectly).
*/
lis r2,0x1000
mtspr MAS0,r2
tlbre
tlbwe
isync
1:
/*
* Clear and set up some registers.
* Note: Some registers need strict synchronization by
* sync/mbar/msync/isync when being "mtspr".
* BookE: isync before PID,tlbivax,tlbwe
* BookE: isync after MSR,PID; msync_isync after tlbivax & tlbwe
* E500: msync,isync before L1CSR0
* E500: isync after BBEAR,BBTAR,BUCSR,DBCR0,DBCR1,HID0,HID1,
* L1CSR0, L1CSR1, MAS[0,1,2,3,4,6],MMUCSR0, PID[0,1,2],
* SPEFCSR
*/
/* invalidate d-cache */
mfspr r0,L1CSR0
ori r0,r0,0x0002
msync
isync
mtspr L1CSR0,r0
isync
/* disable d-cache */
li r0,0x0
mtspr L1CSR0,r0
/* invalidate i-cache */
mfspr r0,L1CSR1
ori r0,r0,0x0002
mtspr L1CSR1,r0
isync
/* disable i-cache */
li r0,0x0
mtspr L1CSR1,r0
isync
/* clear registers */
li r0,0
mtspr SRR0,r0
mtspr SRR1,r0
mtspr CSRR0,r0
mtspr CSRR1,r0
mtspr MCSRR0,r0
mtspr MCSRR1,r0
mtspr ESR,r0
mtspr MCSR,r0
mtspr DEAR,r0
/* not needed and conflicts with some debuggers */
/* mtspr DBCR0,r0 */
mtspr DBCR1,r0
mtspr DBCR2,r0
/* not needed and conflicts with some debuggers */
/* mtspr IAC1,r0 */
/* mtspr IAC2,r0 */
mtspr DAC1,r0
mtspr DAC2,r0
mfspr r1,DBSR
mtspr DBSR,r1 /* Clear all valid bits */
mtspr PID0,r0
mtspr PID1,r0
mtspr PID2,r0
mtspr TCR,r0
mtspr BUCSR,r0 /* disable branch prediction */
mtspr MAS4,r0
mtspr MAS6,r0
#if defined(CONFIG_ENABLE_36BIT_PHYS)
mtspr MAS7,r0
#endif
isync
/* 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 */
/*
* Invalidate MMU L1/L2
*
* Note: There is a fixup earlier for Errata CPU4 on
* Rev 1 parts that must precede this MMU invalidation.
*/
li r2, 0x001e
mtspr MMUCSR0, r2
isync
/*
* Invalidate all TLB0 entries.
*/
li r3,4
li r4,0
tlbivax r4,r3
/*
* To avoid REV1 Errata CPU6 issues, make sure
* the instruction following tlbivax is not a store.
*/
/*
* 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
li r1,0x0020 /* max 16 TLB1 plus some TLB0 entries */
mtctr r1
lwzu r4,0(r5) /* how many TLB1 entries we actually use */
0: cmpwi r4,0
beq 1f
lwzu r0,4(r5)
lwzu r1,4(r5)
lwzu r2,4(r5)
lwzu r3,4(r5)
mtspr MAS0,r0
mtspr MAS1,r1
mtspr MAS2,r2
mtspr MAS3,r3
isync
msync
tlbwe
isync
addi r4,r4,-1
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
li r1,0x0007 /* 8 LAWs, but reserve one for boot-over-rio-or-pci */
mtctr r1
lwzu r5,0(r6) /* how many windows we actually use */
li r2,0x0c28 /* the first pair is reserved for boot-over-rio-or-pci */
li r1,0x0c30
0: cmpwi r5,0
beq 1f
lwzu r4,4(r6)
lwzu r3,4(r6)
stwx r4,r7,r2
stwx r3,r7,r1
addi r5,r5,-1
addi r2,r2,0x0020
addi r1,r1,0x0020
bdnz 0b
/* Jump out the last 4K page and continue to 'normal' start */
1: bl 3f
b _start
3: li r0,0
mtspr SRR1,r0 /* Keep things disabled for now */
mflr r1
mtspr SRR0,r1
rfi
/*
* 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:
/* 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 */
ori r0,r0,0x4000 /* time base is processor clock */
#if defined(CONFIG_ENABLE_36BIT_PHYS)
ori r0,r0,0x0080 /* enable MAS7 updates */
#endif
mtspr HID0,r0
#if defined(CONFIG_ADDR_STREAMING)
li r0,0x3000
#else
li r0,0x1000
#endif
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 */
mfspr r2, L1CSR0
ori r2, r2, 0x0003
oris r2, r2, 0x0001
mtspr L1CSR0, r2 /* enable/invalidate L1 Dcache */
isync
/* 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
#ifndef CFG_RAMBOOT
/* 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:
#endif /* CFG_RAMBOOT */
/* 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 icache_enable
bl board_init_f
isync
/* --FIXME-- machine check with MCSRRn and rfmci */
.globl _start_of_vectors
_start_of_vectors:
#if 0
/* Critical input. */
CRIT_EXCEPTION(0x0100, CritcalInput, CritcalInputException)
#endif
/* Machine check --FIXME-- Should be MACH_EXCEPTION */
CRIT_EXCEPTION(0x0200, 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, UnknownException)
/* Alignment exception. */
. = 0x0600
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 */
. = 0x0700
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 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:
. = 0x2100
/*
* 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 990,r2 /* SRR2 */
mtspr 991,r0 /* SRR3 */
lwz r0,GPR0(r1)
lwz r2,GPR2(r1)
lwz r1,GPR1(r1)
SYNC
rfci
/* Cache functions.
*/
invalidate_icache:
mfspr r0,L1CSR1
ori r0,r0,0x0002
mtspr L1CSR1,r0
isync
blr /* entire I cache */
invalidate_dcache:
mfspr r0,L1CSR0
ori r0,r0,0x0002
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 r1,0xfffffffe@h
ori r1,r1,0xfffffffe@l
and r0,r0,r1
mtspr L1CSR1,r0
isync
blr
.globl icache_status
icache_status:
mfspr r3,L1CSR1
srwi r3, r3, 31 /* >>31 => select bit 0 */
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 r0,L1CSR0
lis r1,0xfffffffe@h
ori r1,r1,0xfffffffe@l
and r0,r0,r1
msync
isync
mtspr L1CSR0,r0
isync
blr
.globl dcache_status
dcache_status:
mfspr r3,L1CSR0
srwi r3, r3, 31 /* >>31 => select bit 0 */
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 + EXC_OFF_SYS_RESET
mtlr r0
blr /* NEVER RETURNS! */
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)
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
bl trap_reloc
li r7, .L_DataStorage - _start + EXC_OFF_SYS_RESET
bl trap_reloc
li r7, .L_InstStorage - _start + EXC_OFF_SYS_RESET
bl trap_reloc
li r7, .L_ExtInterrupt - _start + EXC_OFF_SYS_RESET
bl trap_reloc
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
bl trap_reloc
li r7, .L_Decrementer - _start + EXC_OFF_SYS_RESET
bl trap_reloc
li r7, .L_IntervalTimer - _start + EXC_OFF_SYS_RESET
li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
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 r2,512
mtctr r2
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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