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u-boot/arch/powerpc/cpu/mpc86xx/start.S
Becky Bruce 1605cc9e1b powerpc/mpc86xx: Disable translation for BAT setup 
We really shouldn't be overwriting bat registers with translation enabled,
especially when we're executing code using one of them for translating
the current instruction stream.  Instead, disable address translation
while doing the final BAT setup.

In order to do this, setup_bats has to move back to asm code, because we
require translation to be enabled to have a stack for C code.  The yucky
thing about that is that the assembler doesn't like ULL so we have to
switch to using HIGH/LOW pairs for physical addresses that are > 32 bits
in length.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Acked-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2011-10-09 17:57:54 -05:00

1008 lines
21 KiB
ArmAsm
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/*
* Copyright 2004, 2007, 2011 Freescale Semiconductor.
* Srikanth Srinivasan <srikanth.srinivaan@freescale.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 86xx 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 <asm-offsets.h>
#include <config.h>
#include <mpc86xx.h>
#include <version.h>
#include <ppc_asm.tmpl>
#include <ppc_defs.h>
#include <asm/cache.h>
#include <asm/mmu.h>
#include <asm/u-boot.h>
/*
* Need MSR_DR | MSR_IR enabled to access I/O (printf) in exceptions
*/
/*
* Set up GOT: Global Offset Table
*
* Use r12 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(__bss_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_STRING, "\0"
. = EXC_OFF_SYS_RESET
.globl _start
_start:
b boot_cold
/* 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. */
STD_EXCEPTION(0x300, DataStorage, UnknownException)
/* Instruction Storage exception. */
STD_EXCEPTION(0x400, InstStorage, UnknownException)
/* External Interrupt exception. */
STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
/* Alignment exception. */
. = 0x600
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
EXC_XFER_TEMPLATE(Alignment, AlignmentException, MSR_KERNEL, COPY_EE)
/* Program check exception */
. = 0x700
ProgramCheck:
EXCEPTION_PROLOG(SRR0, SRR1)
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException,
MSR_KERNEL, COPY_EE)
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)
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:
/*
* NOTE: Only Cpu 0 will ever come here. Other cores go to an
* address specified by the BPTR
*/
1:
#ifdef CONFIG_SYS_RAMBOOT
/* disable everything */
li r0, 0
mtspr HID0, r0
sync
mtmsr 0
#endif
/* Invalidate BATs */
bl invalidate_bats
sync
/* Invalidate all of TLB before MMU turn on */
bl clear_tlbs
sync
#ifdef CONFIG_SYS_L2
/* init the L2 cache */
lis r3, L2_INIT@h
ori r3, r3, L2_INIT@l
mtspr l2cr, r3
/* invalidate the L2 cache */
bl l2cache_invalidate
sync
#endif
/*
* Calculate absolute address in FLASH and jump there
*------------------------------------------------------*/
lis r3, CONFIG_SYS_MONITOR_BASE_EARLY@h
ori r3, r3, CONFIG_SYS_MONITOR_BASE_EARLY@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 */
/* enable extended addressing */
bl enable_ext_addr
/* setup the bats */
bl early_bats
/*
* Cache must be enabled here for stack-in-cache trick.
* This means we need to enable the BATS.
* Cache should be turned on after BATs, since by default
* everything is write-through.
*/
/* enable address translation */
mfmsr r5
ori r5, r5, (MSR_IR | MSR_DR)
lis r3,addr_trans_enabled@h
ori r3, r3, addr_trans_enabled@l
mtspr SPRN_SRR0,r3
mtspr SPRN_SRR1,r5
rfi
addr_trans_enabled:
/* enable and invalidate the data cache */
/* bl l1dcache_enable */
bl dcache_enable
sync
#if 1
bl icache_enable
#endif
#ifdef CONFIG_SYS_INIT_RAM_LOCK
bl lock_ram_in_cache
sync
#endif
#if (CONFIG_SYS_CCSRBAR_DEFAULT != CONFIG_SYS_CCSRBAR)
bl setup_ccsrbar
#endif
/* set up the stack pointer in our newly created
* cache-ram (r1) */
lis r1, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@h
ori r1, r1, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_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
#ifdef RUN_DIAG
/* Load PX_AUX register address in r4 */
lis r4, PIXIS_BASE@h
ori r4, r4, 0x6
/* Load contents of PX_AUX in r3 bits 24 to 31*/
lbz r3, 0(r4)
/* Mask and obtain the bit in r3 */
rlwinm. r3, r3, 0, 24, 24
/* If not zero, jump and continue with u-boot */
bne diag_done
/* Load back contents of PX_AUX in r3 bits 24 to 31 */
lbz r3, 0(r4)
/* Set the MSB of the register value */
ori r3, r3, 0x80
/* Write value in r3 back to PX_AUX */
stb r3, 0(r4)
/* Get the address to jump to in r3*/
lis r3, CONFIG_SYS_DIAG_ADDR@h
ori r3, r3, CONFIG_SYS_DIAG_ADDR@l
/* Load the LR with the branch address */
mtlr r3
/* Branch to diagnostic */
blr
diag_done:
#endif
/* bl l2cache_enable */
/* run 1st part of board init code (from Flash) */
bl board_init_f
sync
/* NOTREACHED - board_init_f() does not return */
.globl invalidate_bats
invalidate_bats:
li r0, 0
/* invalidate BATs */
mtspr IBAT0U, r0
mtspr IBAT1U, r0
mtspr IBAT2U, r0
mtspr IBAT3U, r0
mtspr IBAT4U, r0
mtspr IBAT5U, r0
mtspr IBAT6U, r0
mtspr IBAT7U, r0
isync
mtspr DBAT0U, r0
mtspr DBAT1U, r0
mtspr DBAT2U, r0
mtspr DBAT3U, r0
mtspr DBAT4U, r0
mtspr DBAT5U, r0
mtspr DBAT6U, r0
mtspr DBAT7U, r0
isync
sync
blr
#define CONFIG_BAT_PAIR(n) \
lis r4, CONFIG_SYS_IBAT##n##L@h; \
ori r4, r4, CONFIG_SYS_IBAT##n##L@l; \
lis r3, CONFIG_SYS_IBAT##n##U@h; \
ori r3, r3, CONFIG_SYS_IBAT##n##U@l; \
mtspr IBAT##n##L, r4; \
mtspr IBAT##n##U, r3; \
lis r4, CONFIG_SYS_DBAT##n##L@h; \
ori r4, r4, CONFIG_SYS_DBAT##n##L@l; \
lis r3, CONFIG_SYS_DBAT##n##U@h; \
ori r3, r3, CONFIG_SYS_DBAT##n##U@l; \
mtspr DBAT##n##L, r4; \
mtspr DBAT##n##U, r3;
/*
* setup_bats:
*
* Set up the final BAT registers now that setup is done.
*
* Assumes that:
* 1) Address translation is enabled upon entry
* 2) The boot rom is still accessible via 1:1 translation
*/
.globl setup_bats
setup_bats:
mflr r5
sync
/*
* When we disable address translation, we will get 1:1 (VA==PA)
* translation. The only place we know for sure is safe for that is
* the bootrom where we originally started out. Pop back into there.
*/
lis r4, CONFIG_SYS_MONITOR_BASE_EARLY@h
ori r4, r4, CONFIG_SYS_MONITOR_BASE_EARLY@l
addi r4, r4, trans_disabled - _start + EXC_OFF_SYS_RESET
/* disable address translation */
mfmsr r3
rlwinm r3, r3, 0, 28, 25
mtspr SRR0, r4
mtspr SRR1, r3
rfi
trans_disabled:
#if defined(CONFIG_SYS_DBAT0U) && defined(CONFIG_SYS_DBAT0L) \
&& defined(CONFIG_SYS_IBAT0U) && defined(CONFIG_SYS_IBAT0L)
CONFIG_BAT_PAIR(0)
#endif
CONFIG_BAT_PAIR(1)
CONFIG_BAT_PAIR(2)
CONFIG_BAT_PAIR(3)
CONFIG_BAT_PAIR(4)
CONFIG_BAT_PAIR(5)
CONFIG_BAT_PAIR(6)
CONFIG_BAT_PAIR(7)
sync
isync
/* Turn translation back on and return */
mfmsr r3
ori r3, r3, (MSR_IR | MSR_DR)
mtspr SPRN_SRR0,r5
mtspr SPRN_SRR1,r3
rfi
/*
* early_bats:
*
* Set up bats needed early on - this is usually the BAT for the
* stack-in-cache, the Flash, and CCSR space
*/
.globl early_bats
early_bats:
/* IBAT 3 */
lis r4, CONFIG_SYS_IBAT3L@h
ori r4, r4, CONFIG_SYS_IBAT3L@l
lis r3, CONFIG_SYS_IBAT3U@h
ori r3, r3, CONFIG_SYS_IBAT3U@l
mtspr IBAT3L, r4
mtspr IBAT3U, r3
isync
/* DBAT 3 */
lis r4, CONFIG_SYS_DBAT3L@h
ori r4, r4, CONFIG_SYS_DBAT3L@l
lis r3, CONFIG_SYS_DBAT3U@h
ori r3, r3, CONFIG_SYS_DBAT3U@l
mtspr DBAT3L, r4
mtspr DBAT3U, r3
isync
/* IBAT 5 */
lis r4, CONFIG_SYS_IBAT5L@h
ori r4, r4, CONFIG_SYS_IBAT5L@l
lis r3, CONFIG_SYS_IBAT5U@h
ori r3, r3, CONFIG_SYS_IBAT5U@l
mtspr IBAT5L, r4
mtspr IBAT5U, r3
isync
/* DBAT 5 */
lis r4, CONFIG_SYS_DBAT5L@h
ori r4, r4, CONFIG_SYS_DBAT5L@l
lis r3, CONFIG_SYS_DBAT5U@h
ori r3, r3, CONFIG_SYS_DBAT5U@l
mtspr DBAT5L, r4
mtspr DBAT5U, r3
isync
/* IBAT 6 */
lis r4, CONFIG_SYS_IBAT6L_EARLY@h
ori r4, r4, CONFIG_SYS_IBAT6L_EARLY@l
lis r3, CONFIG_SYS_IBAT6U_EARLY@h
ori r3, r3, CONFIG_SYS_IBAT6U_EARLY@l
mtspr IBAT6L, r4
mtspr IBAT6U, r3
isync
/* DBAT 6 */
lis r4, CONFIG_SYS_DBAT6L_EARLY@h
ori r4, r4, CONFIG_SYS_DBAT6L_EARLY@l
lis r3, CONFIG_SYS_DBAT6U_EARLY@h
ori r3, r3, CONFIG_SYS_DBAT6U_EARLY@l
mtspr DBAT6L, r4
mtspr DBAT6U, r3
isync
#if(CONFIG_SYS_CCSRBAR_DEFAULT != CONFIG_SYS_CCSRBAR)
/* IBAT 7 */
lis r4, CONFIG_SYS_CCSR_DEFAULT_IBATL@h
ori r4, r4, CONFIG_SYS_CCSR_DEFAULT_IBATL@l
lis r3, CONFIG_SYS_CCSR_DEFAULT_IBATU@h
ori r3, r3, CONFIG_SYS_CCSR_DEFAULT_IBATU@l
mtspr IBAT7L, r4
mtspr IBAT7U, r3
isync
/* DBAT 7 */
lis r4, CONFIG_SYS_CCSR_DEFAULT_DBATL@h
ori r4, r4, CONFIG_SYS_CCSR_DEFAULT_DBATL@l
lis r3, CONFIG_SYS_CCSR_DEFAULT_DBATU@h
ori r3, r3, CONFIG_SYS_CCSR_DEFAULT_DBATU@l
mtspr DBAT7L, r4
mtspr DBAT7U, r3
isync
#endif
blr
.globl clear_tlbs
clear_tlbs:
addis r3, 0, 0x0000
addis r5, 0, 0x4
isync
tlblp:
tlbie r3
sync
addi r3, r3, 0x1000
cmp 0, 0, r3, r5
blt tlblp
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
.globl get_svr
get_svr:
mfspr r3, SVR
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
/*
* 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 */
GET_GOT
mr r3, r5 /* Destination Address */
lis r4, CONFIG_SYS_MONITOR_BASE@h /* Source Address */
ori r4, r4, CONFIG_SYS_MONITOR_BASE@l
lwz r5, GOT(__init_end)
sub r5, r5, r4
li r6, CONFIG_SYS_CACHELINE_SIZE /* Cache Line Size */
/*
* Fix GOT pointer:
*
* New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE) + Destination Address
*
* Offset:
*/
sub r15, r10, r4
/* First our own GOT */
add r12, r12, r15
/* then 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
/*
* 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:
/*
* Relocation Function, r12 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)
cmpwi r0,0
beq- 2f
add r0,r0,r11
stw r0,0(r3)
2: bdnz 1b
/*
* Now adjust the fixups and the pointers to the fixups
* in case we need to move ourselves again.
*/
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
cmpwi r0,0
add r0,r0,r11
stw r4,0(r3)
beq- 5f
stw r0,0(r4)
5: bdnz 3b
4:
/* clear_bss: */
/*
* Now clear BSS segment
*/
lwz r3,GOT(__bss_start)
lwz r4,GOT(__bss_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 Date pointer */
mr r4, r10 /* Destination Address */
bl board_init_r
/* 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:
mflr r4 /* save link register */
GET_GOT
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 */
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
ori r7,r7,MSR_ME /* Enable Machine Check */
mtmsr r7
mtlr r4 /* restore link register */
blr
.globl enable_ext_addr
enable_ext_addr:
mfspr r0, HID0
lis r0, (HID0_HIGH_BAT_EN | HID0_XBSEN | HID0_XAEN)@h
ori r0, r0, (HID0_HIGH_BAT_EN | HID0_XBSEN | HID0_XAEN)@l
mtspr HID0, r0
sync
isync
blr
#if (CONFIG_SYS_CCSRBAR_DEFAULT != CONFIG_SYS_CCSRBAR)
.globl setup_ccsrbar
setup_ccsrbar:
/* Special sequence needed to update CCSRBAR itself */
lis r4, CONFIG_SYS_CCSRBAR_DEFAULT@h
ori r4, r4, CONFIG_SYS_CCSRBAR_DEFAULT@l
lis r5, CONFIG_SYS_CCSRBAR_PHYS_LOW@h
ori r5, r5, CONFIG_SYS_CCSRBAR_PHYS_LOW@l
srwi r5,r5,12
li r6, CONFIG_SYS_CCSRBAR_PHYS_HIGH@l
rlwimi r5,r6,20,8,11
stw r5, 0(r4) /* Store physical value of CCSR */
isync
lis r5, CONFIG_SYS_TEXT_BASE@h
ori r5,r5,CONFIG_SYS_TEXT_BASE@l
lwz r5, 0(r5)
isync
/* Use VA of CCSR to do read */
lis r3, CONFIG_SYS_CCSRBAR@h
lwz r5, CONFIG_SYS_CCSRBAR@l(r3)
isync
blr
#endif
#ifdef CONFIG_SYS_INIT_RAM_LOCK
lock_ram_in_cache:
/* Allocate Initial RAM in data cache.
*/
lis r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@h
ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@l
li r4, ((CONFIG_SYS_INIT_RAM_SIZE & ~31) + \
(CONFIG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
mtctr r4
1:
dcbz r0, r3
addi r3, r3, 32
bdnz 1b
#if 1
/* Lock the data cache */
mfspr r0, HID0
ori r0, r0, 0x1000
sync
mtspr HID0, r0
sync
blr
#endif
#if 0
/* Lock the first way of the data cache */
mfspr r0, LDSTCR
ori r0, r0, 0x0080
#if defined(CONFIG_ALTIVEC)
dssall
#endif
sync
mtspr LDSTCR, r0
sync
isync
blr
#endif
.globl unlock_ram_in_cache
unlock_ram_in_cache:
/* invalidate the INIT_RAM section */
lis r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@h
ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@l
li r4, ((CONFIG_SYS_INIT_RAM_SIZE & ~31) + \
(CONFIG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
mtctr r4
1: icbi r0, r3
addi r3, r3, 32
bdnz 1b
sync /* Wait for all icbi to complete on bus */
isync
#if 1
/* 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
#if 0
/* Unlock the first way of the data cache */
mfspr r0, LDSTCR
li r3,0x0080
andc r0,r0,r3
#ifdef CONFIG_ALTIVEC
dssall
#endif
sync
mtspr LDSTCR, r0
sync
isync
li r3,0x0400
or r0,r0,r3
sync
mtspr HID0, r0
sync
blr
#endif
#endif
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