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openrisc: Add cpu files 

Signed-off-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
This commit is contained in:
Stefan Kristiansson 2011-11-26 19:04:51 +00:00 committed by Wolfgang Denk
parent 3ddcaccda3
commit 272f84bbdf
7 changed files with 923 additions and 0 deletions
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27
arch/openrisc/config.mk Normal file
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#
# (C) Copyright 2011
# Julius Baxter <julius@opencores.org>
#
# 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
#
CROSS_COMPILE ?= or32-elf-
# r10 used for global object pointer, already set in OR32 GCC but just to be
# clear
PLATFORM_CPPFLAGS += -DCONFIG_OPENRISC -D__OR1K__ -ffixed-r10
CONFIG_STANDALONE_LOAD_ADDR ?= 0x40000

47
arch/openrisc/cpu/Makefile Normal file
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#
# (C) Copyright 2011
# Julius Baxter <julius@opencores.org>
#
# 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
#
include $(TOPDIR)/config.mk
LIB = $(obj)lib$(CPU).o
START = start.o
COBJS-y = cache.o cpu.o exceptions.o interrupts.o
SRCS := $(START:.o=.S) $(COBJS-y:.o=.c)
OBJS := $(addprefix $(obj),$(COBJS-y))
START := $(addprefix $(obj),$(START))
all: $(obj).depend $(START) $(LIB)
$(LIB): $(OBJS)
$(call cmd_link_o_target, $(OBJS))
#########################################################################
# defines $(obj).depend target
include $(SRCTREE)/rules.mk
sinclude $(obj).depend
#########################################################################

151
arch/openrisc/cpu/cache.c Normal file
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/*
* (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
* (C) Copyright 2011, Julius Baxter <julius@opencores.org>
*
* 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
*/
#include <common.h>
#include <asm/system.h>
void flush_dcache_range(unsigned long addr, unsigned long stop)
{
ulong block_size = (mfspr(SPR_DCCFGR) & SPR_DCCFGR_CBS) ? 32 : 16;
while (addr < stop) {
mtspr(SPR_DCBFR, addr);
addr += block_size;
}
}
void invalidate_dcache_range(unsigned long addr, unsigned long stop)
{
ulong block_size = (mfspr(SPR_DCCFGR) & SPR_DCCFGR_CBS) ? 32 : 16;
while (addr < stop) {
mtspr(SPR_DCBIR, addr);
addr += block_size;
}
}
static void invalidate_icache_range(unsigned long addr, unsigned long stop)
{
ulong block_size = (mfspr(SPR_ICCFGR) & SPR_ICCFGR_CBS) ? 32 : 16;
while (addr < stop) {
mtspr(SPR_ICBIR, addr);
addr += block_size;
}
}
void flush_cache(unsigned long addr, unsigned long size)
{
flush_dcache_range(addr, addr + size);
invalidate_icache_range(addr, addr + size);
}
int icache_status(void)
{
return mfspr(SPR_SR) & SPR_SR_ICE;
}
int checkicache(void)
{
unsigned long iccfgr;
unsigned long cache_set_size;
unsigned long cache_ways;
unsigned long cache_block_size;
iccfgr = mfspr(SPR_ICCFGR);
cache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3);
cache_block_size = (iccfgr & SPR_ICCFGR_CBS) ? 32 : 16;
return cache_set_size * cache_ways * cache_block_size;
}
int dcache_status(void)
{
return mfspr(SPR_SR) & SPR_SR_DCE;
}
int checkdcache(void)
{
unsigned long dccfgr;
unsigned long cache_set_size;
unsigned long cache_ways;
unsigned long cache_block_size;
dccfgr = mfspr(SPR_DCCFGR);
cache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3);
cache_block_size = (dccfgr & SPR_DCCFGR_CBS) ? 32 : 16;
return cache_set_size * cache_ways * cache_block_size;
}
void dcache_enable(void)
{
mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_DCE);
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
}
void dcache_disable(void)
{
mtspr(SPR_SR, mfspr(SPR_SR) & ~SPR_SR_DCE);
}
void icache_enable(void)
{
mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_ICE);
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
asm volatile("l.nop");
}
void icache_disable(void)
{
mtspr(SPR_SR, mfspr(SPR_SR) & ~SPR_SR_ICE);
}
int cache_init(void)
{
if (mfspr(SPR_UPR) & SPR_UPR_ICP) {
icache_disable();
invalidate_icache_range(0, checkicache());
icache_enable();
}
if (mfspr(SPR_UPR) & SPR_UPR_DCP) {
dcache_disable();
invalidate_dcache_range(0, checkdcache());
dcache_enable();
}
return 0;
}

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arch/openrisc/cpu/cpu.c Normal file
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/*
* (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
* (C) Copyright 2011, Julius Baxter <julius@opencores.org>
*
* 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
*/
#include <common.h>
#include <asm/system.h>
#include <asm/openrisc_exc.h>
static volatile int illegal_instruction;
static void illegal_instruction_handler(void)
{
ulong *epcr = (ulong *)mfspr(SPR_EPCR_BASE);
/* skip over the illegal instruction */
mtspr(SPR_EPCR_BASE, (ulong)(++epcr));
illegal_instruction = 1;
}
static void checkinstructions(void)
{
ulong ra = 1, rb = 1, rc;
exception_install_handler(EXC_ILLEGAL_INSTR,
illegal_instruction_handler);
illegal_instruction = 0;
asm volatile("l.mul %0,%1,%2" : "=r" (rc) : "r" (ra), "r" (rb));
printf(" Hardware multiplier: %s\n",
illegal_instruction ? "no" : "yes");
illegal_instruction = 0;
asm volatile("l.div %0,%1,%2" : "=r" (rc) : "r" (ra), "r" (rb));
printf(" Hardware divider: %s\n",
illegal_instruction ? "no" : "yes");
exception_free_handler(EXC_ILLEGAL_INSTR);
}
int checkcpu(void)
{
ulong upr = mfspr(SPR_UPR);
ulong vr = mfspr(SPR_VR);
ulong iccfgr = mfspr(SPR_ICCFGR);
ulong dccfgr = mfspr(SPR_DCCFGR);
ulong immucfgr = mfspr(SPR_IMMUCFGR);
ulong dmmucfgr = mfspr(SPR_DMMUCFGR);
ulong cpucfgr = mfspr(SPR_CPUCFGR);
uint ver = (vr & SPR_VR_VER) >> 24;
uint rev = vr & SPR_VR_REV;
uint block_size;
uint ways;
uint sets;
printf("CPU: OpenRISC-%x00 (rev %d) @ %d MHz\n",
ver, rev, (CONFIG_SYS_CLK_FREQ / 1000000));
if (upr & SPR_UPR_DCP) {
block_size = (dccfgr & SPR_DCCFGR_CBS) ? 32 : 16;
ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
printf(" D-Cache: %d bytes, %d bytes/line, %d way(s)\n",
checkdcache(), block_size, ways);
} else {
printf(" D-Cache: no\n");
}
if (upr & SPR_UPR_ICP) {
block_size = (iccfgr & SPR_ICCFGR_CBS) ? 32 : 16;
ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
printf(" I-Cache: %d bytes, %d bytes/line, %d way(s)\n",
checkicache(), block_size, ways);
} else {
printf(" I-Cache: no\n");
}
if (upr & SPR_UPR_DMP) {
sets = 1 << ((dmmucfgr & SPR_DMMUCFGR_NTS) >> 2);
ways = (dmmucfgr & SPR_DMMUCFGR_NTW) + 1;
printf(" DMMU: %d sets, %d way(s)\n",
sets, ways);
} else {
printf(" DMMU: no\n");
}
if (upr & SPR_UPR_IMP) {
sets = 1 << ((immucfgr & SPR_IMMUCFGR_NTS) >> 2);
ways = (immucfgr & SPR_IMMUCFGR_NTW) + 1;
printf(" IMMU: %d sets, %d way(s)\n",
sets, ways);
} else {
printf(" IMMU: no\n");
}
printf(" MAC unit: %s\n",
(upr & SPR_UPR_MP) ? "yes" : "no");
printf(" Debug unit: %s\n",
(upr & SPR_UPR_DUP) ? "yes" : "no");
printf(" Performance counters: %s\n",
(upr & SPR_UPR_PCUP) ? "yes" : "no");
printf(" Power management: %s\n",
(upr & SPR_UPR_PMP) ? "yes" : "no");
printf(" Interrupt controller: %s\n",
(upr & SPR_UPR_PICP) ? "yes" : "no");
printf(" Timer: %s\n",
(upr & SPR_UPR_TTP) ? "yes" : "no");
printf(" Custom unit(s): %s\n",
(upr & SPR_UPR_CUP) ? "yes" : "no");
printf(" Supported instructions:\n");
printf(" ORBIS32: %s\n",
(cpucfgr & SPR_CPUCFGR_OB32S) ? "yes" : "no");
printf(" ORBIS64: %s\n",
(cpucfgr & SPR_CPUCFGR_OB64S) ? "yes" : "no");
printf(" ORFPX32: %s\n",
(cpucfgr & SPR_CPUCFGR_OF32S) ? "yes" : "no");
printf(" ORFPX64: %s\n",
(cpucfgr & SPR_CPUCFGR_OF64S) ? "yes" : "no");
checkinstructions();
return 0;
}
int cleanup_before_linux(void)
{
disable_interrupts();
return 0;
}
extern void __reset(void);
int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
disable_interrupts();
__reset();
/* not reached, __reset does not return */
return 0;
}

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arch/openrisc/cpu/exceptions.c Normal file
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/*
* (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
* (C) Copyright 2011, Julius Baxter <julius@opencores.org>
*
* 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
*/
#include <common.h>
#include <stdio_dev.h>
#include <asm/system.h>
static const char * const excp_table[] = {
"Unknown exception",
"Reset",
"Bus Error",
"Data Page Fault",
"Instruction Page Fault",
"Tick Timer",
"Alignment",
"Illegal Instruction",
"External Interrupt",
"D-TLB Miss",
"I-TLB Miss",
"Range",
"System Call",
"Floating Point",
"Trap",
};
static void (*handlers[32])(void);
void exception_install_handler(int exception, void (*handler)(void))
{
if (exception < 0 || exception > 31)
return;
handlers[exception] = handler;
}
void exception_free_handler(int exception)
{
if (exception < 0 || exception > 31)
return;
handlers[exception] = 0;
}
static void exception_hang(int vect)
{
printf("Unhandled exception at 0x%x ", vect & 0xff00);
vect = ((vect >> 8) & 0xff);
if (vect < ARRAY_SIZE(excp_table))
printf("(%s)\n", excp_table[vect]);
else
printf("(%s)\n", excp_table[0]);
printf("EPCR: 0x%08lx\n", mfspr(SPR_EPCR_BASE));
printf("EEAR: 0x%08lx\n", mfspr(SPR_EEAR_BASE));
printf("ESR: 0x%08lx\n", mfspr(SPR_ESR_BASE));
hang();
}
void exception_handler(int vect)
{
int exception = vect >> 8;
if (handlers[exception])
handlers[exception]();
else
exception_hang(vect);
}

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arch/openrisc/cpu/interrupts.c Normal file
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/*
* (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
* (C) Copyright 2011, Julius Baxter <julius@opencores.org>
*
* 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
*/
#include <common.h>
#include <asm/types.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/openrisc_exc.h>
struct irq_action {
interrupt_handler_t *handler;
void *arg;
int count;
};
static struct irq_action handlers[32];
void interrupt_handler(void)
{
int irq;
while ((irq = ffs(mfspr(SPR_PICSR)))) {
if (handlers[--irq].handler) {
handlers[irq].handler(handlers[irq].arg);
handlers[irq].count++;
} else {
/* disable the interrupt */
mtspr(SPR_PICMR, mfspr(SPR_PICMR) & ~(1 << irq));
printf("Unhandled interrupt: %d\n", irq);
}
/* clear the interrupt */
mtspr(SPR_PICSR, mfspr(SPR_PICSR) & ~(1 << irq));
}
}
int interrupt_init(void)
{
/* install handler for external interrupt exception */
exception_install_handler(EXC_EXT_IRQ, interrupt_handler);
/* Enable interrupts in supervisor register */
mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_IEE);
return 0;
}
void enable_interrupts(void)
{
/* Set interrupt enable bit in supervisor register */
mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_IEE);
/* Enable timer exception */
mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_TEE);
}
int disable_interrupts(void)
{
/* Clear interrupt enable bit in supervisor register */
mtspr(SPR_SR, mfspr(SPR_SR) & ~SPR_SR_IEE);
/* Disable timer exception */
mtspr(SPR_SR, mfspr(SPR_SR) & ~SPR_SR_TEE);
return 0;
}
void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
{
if (irq < 0 || irq > 31)
return;
handlers[irq].handler = handler;
handlers[irq].arg = arg;
}
void irq_free_handler(int irq)
{
if (irq < 0 || irq > 31)
return;
handlers[irq].handler = 0;
handlers[irq].arg = 0;
}
#if defined(CONFIG_CMD_IRQ)
int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
int i;
printf("\nInterrupt-Information:\n\n");
printf("Nr Routine Arg Count\n");
printf("-----------------------------\n");
for (i = 0; i < 32; i++) {
if (handlers[i].handler) {
printf("%02d %08lx %08lx %d\n",
i,
(ulong)handlers[i].handler,
(ulong)handlers[i].arg,
handlers[i].count);
}
}
printf("\n");
return 0;
}
#endif

335
arch/openrisc/cpu/start.S Normal file
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/*
* (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
* (C) Copyright 2011, Julius Baxter <julius@opencores.org>
*
* 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
*/
#include <config.h>
#include <asm-offsets.h>
#include <asm/spr-defs.h>
#define EXCEPTION_STACK_SIZE (128+128)
#define HANDLE_EXCEPTION \
l.addi r1, r1, -EXCEPTION_STACK_SIZE ;\
l.sw 0x1c(r1), r9 ;\
l.jal _exception_handler ;\
l.nop ;\
l.lwz r9, 0x1c(r1) ;\
l.addi r1, r1, EXCEPTION_STACK_SIZE ;\
l.rfe ;\
l.nop
.section .vectors, "ax"
.global __reset
/* reset */
.org 0x100
__reset:
/* there is no guarantee r0 is hardwired to zero, clear it here */
l.andi r0, r0, 0
/* reset stack and frame pointers */
l.andi r1, r0, 0
l.andi r2, r0, 0
/* set supervisor mode */
l.ori r3,r0,SPR_SR_SM
l.mtspr r0,r3,SPR_SR
/* Relocate u-boot */
l.movhi r3,hi(__start) /* source start address */
l.ori r3,r3,lo(__start)
l.movhi r4,hi(_stext) /* dest start address */
l.ori r4,r4,lo(_stext)
l.movhi r5,hi(__end) /* dest end address */
l.ori r5,r5,lo(__end)
.L_reloc:
l.lwz r6,0(r3)
l.sw 0(r4),r6
l.addi r3,r3,4
l.sfltu r4,r5
l.bf .L_reloc
l.addi r4,r4,4 /* delay slot */
#ifdef CONFIG_SYS_RELOCATE_VECTORS
/* Relocate vectors from 0xf0000000 to 0x00000000 */
l.movhi r4, 0xf000 /* source */
l.movhi r5, 0 /* destination */
l.addi r6, r5, CONFIG_SYS_VECTORS_LEN /* length */
.L_relocvectors:
l.lwz r7, 0(r4)
l.sw 0(r5), r7
l.addi r5, r5, 4
l.sfeq r5,r6
l.bnf .L_relocvectors
l.addi r4,r4, 4
#endif
l.j _start
l.nop
/* bus error */
.org 0x200
HANDLE_EXCEPTION
/* data page fault */
.org 0x300
HANDLE_EXCEPTION
/* instruction page fault */
.org 0x400
HANDLE_EXCEPTION
/* tick timer */
.org 0x500
HANDLE_EXCEPTION
/* alignment */
.org 0x600
HANDLE_EXCEPTION
/* illegal instruction */
.org 0x700
HANDLE_EXCEPTION
/* external interrupt */
.org 0x800
HANDLE_EXCEPTION
/* D-TLB miss */
.org 0x900
HANDLE_EXCEPTION
/* I-TLB miss */
.org 0xa00
HANDLE_EXCEPTION
/* range */
.org 0xb00
HANDLE_EXCEPTION
/* system call */
.org 0xc00
HANDLE_EXCEPTION
/* floating point */
.org 0xd00
HANDLE_EXCEPTION
/* trap */
.org 0xe00
HANDLE_EXCEPTION
/* reserved */
.org 0xf00
HANDLE_EXCEPTION
/* reserved */
.org 0x1100
HANDLE_EXCEPTION
/* reserved */
.org 0x1200
HANDLE_EXCEPTION
/* reserved */
.org 0x1300
HANDLE_EXCEPTION
/* reserved */
.org 0x1400
HANDLE_EXCEPTION
/* reserved */
.org 0x1500
HANDLE_EXCEPTION
/* reserved */
.org 0x1600
HANDLE_EXCEPTION
/* reserved */
.org 0x1700
HANDLE_EXCEPTION
/* reserved */
.org 0x1800
HANDLE_EXCEPTION
/* reserved */
.org 0x1900
HANDLE_EXCEPTION
/* reserved */
.org 0x1a00
HANDLE_EXCEPTION
/* reserved */
.org 0x1b00
HANDLE_EXCEPTION
/* reserved */
.org 0x1c00
HANDLE_EXCEPTION
/* reserved */
.org 0x1d00
HANDLE_EXCEPTION
/* reserved */
.org 0x1e00
HANDLE_EXCEPTION
/* reserved */
.org 0x1f00
HANDLE_EXCEPTION
/* Startup routine */
.text
.global _start
_start:
/* Init stack and frame pointers */
l.movhi r1, hi(CONFIG_SYS_INIT_SP_ADDR)
l.ori r1, r1, lo(CONFIG_SYS_INIT_SP_ADDR)
l.or r2, r0, r1
/* clear BSS segments */
l.movhi r4, hi(_bss_start)
l.ori r4, r4, lo(_bss_start)
l.movhi r5, hi(_bss_end)
l.ori r5, r5, lo(_bss_end)
.L_clear_bss:
l.sw 0(r4), r0
l.sfltu r4,r5
l.bf .L_clear_bss
l.addi r4,r4,4
/* Reset registers before jumping to board_init */
l.andi r3, r0, 0
l.andi r4, r0, 0
l.andi r5, r0, 0
l.andi r6, r0, 0
l.andi r7, r0, 0
l.andi r8, r0, 0
l.andi r9, r0, 0
l.andi r10, r0, 0
l.andi r11, r0, 0
l.andi r12, r0, 0
l.andi r13, r0, 0
l.andi r14, r0, 0
l.andi r15, r0, 0
l.andi r17, r0, 0
l.andi r18, r0, 0
l.andi r19, r0, 0
l.andi r20, r0, 0
l.andi r21, r0, 0
l.andi r22, r0, 0
l.andi r23, r0, 0
l.andi r24, r0, 0
l.andi r25, r0, 0
l.andi r26, r0, 0
l.andi r27, r0, 0
l.andi r28, r0, 0
l.andi r29, r0, 0
l.andi r30, r0, 0
l.andi r31, r0, 0
l.j board_init
l.nop
.size _start, .-_start
/*
* Store state onto stack and call the real exception handler
*/
.section .text
.extern exception_handler
.type _exception_handler,@function
_exception_handler:
/* Store state (r9 already saved)*/
l.sw 0x00(r1), r2
l.sw 0x04(r1), r3
l.sw 0x08(r1), r4
l.sw 0x0c(r1), r5
l.sw 0x10(r1), r6
l.sw 0x14(r1), r7
l.sw 0x18(r1), r8
l.sw 0x20(r1), r10
l.sw 0x24(r1), r11
l.sw 0x28(r1), r12
l.sw 0x2c(r1), r13
l.sw 0x30(r1), r14
l.sw 0x34(r1), r15
l.sw 0x38(r1), r16
l.sw 0x3c(r1), r17
l.sw 0x40(r1), r18
l.sw 0x44(r1), r19
l.sw 0x48(r1), r20
l.sw 0x4c(r1), r21
l.sw 0x50(r1), r22
l.sw 0x54(r1), r23
l.sw 0x58(r1), r24
l.sw 0x5c(r1), r25
l.sw 0x60(r1), r26
l.sw 0x64(r1), r27
l.sw 0x68(r1), r28
l.sw 0x6c(r1), r29
l.sw 0x70(r1), r30
l.sw 0x74(r1), r31
/* Save return address */
l.or r14, r0, r9
/* Call exception handler with the link address as argument */
l.jal exception_handler
l.or r3, r0, r14
/* Load return address */
l.or r9, r0, r14
/* Restore state */
l.lwz r2, 0x00(r1)
l.lwz r3, 0x04(r1)
l.lwz r4, 0x08(r1)
l.lwz r5, 0x0c(r1)
l.lwz r6, 0x10(r1)
l.lwz r7, 0x14(r1)
l.lwz r8, 0x18(r1)
l.lwz r10, 0x20(r1)
l.lwz r11, 0x24(r1)
l.lwz r12, 0x28(r1)
l.lwz r13, 0x2c(r1)
l.lwz r14, 0x30(r1)
l.lwz r15, 0x34(r1)
l.lwz r16, 0x38(r1)
l.lwz r17, 0x3c(r1)
l.lwz r18, 0x40(r1)
l.lwz r19, 0x44(r1)
l.lwz r20, 0x48(r1)
l.lwz r21, 0x4c(r1)
l.lwz r22, 0x50(r1)
l.lwz r23, 0x54(r1)
l.lwz r24, 0x58(r1)
l.lwz r25, 0x5c(r1)
l.lwz r26, 0x60(r1)
l.lwz r27, 0x64(r1)
l.lwz r28, 0x68(r1)
l.lwz r29, 0x6c(r1)
l.lwz r30, 0x70(r1)
l.lwz r31, 0x74(r1)
l.jr r9
l.nop