Commit 979934da authored by Yoichi Yuasa's avatar Yoichi Yuasa Committed by Linus Torvalds
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[PATCH] mips: update IRQ handling for vr41xx



This patch has updated IRQ handling for vr41xx.
o added common IRQ dispatch
o changed IRQ number in int-handler.S
o added resource management to icu.c
Signed-off-by: default avatarYoichi Yuasa <yuasa@hh.iij4u.or.jp>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 006cfb51
......@@ -2,7 +2,7 @@
# Makefile for common code of the NEC VR4100 series.
#
obj-y += bcu.o cmu.o icu.o init.o int-handler.o pmu.o
obj-y += bcu.o cmu.o icu.o init.o int-handler.o irq.o pmu.o
obj-$(CONFIG_VRC4173) += vrc4173.o
EXTRA_AFLAGS := $(CFLAGS)
......@@ -3,8 +3,7 @@
*
* Copyright (C) 2001-2002 MontaVista Software Inc.
* Author: Yoichi Yuasa <yyuasa@mvista.com or source@mvista.com>
* Copyright (C) 2003-2004 Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
* Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org)
* Copyright (C) 2003-2005 Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
*
* 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
......@@ -31,7 +30,7 @@
*/
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/smp.h>
......@@ -39,34 +38,24 @@
#include <asm/cpu.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/irq_cpu.h>
#include <asm/vr41xx/vr41xx.h>
extern asmlinkage void vr41xx_handle_interrupt(void);
extern void init_vr41xx_giuint_irq(void);
extern void giuint_irq_dispatch(struct pt_regs *regs);
static uint32_t icu1_base;
static uint32_t icu2_base;
static struct irqaction icu_cascade = {
.handler = no_action,
.mask = CPU_MASK_NONE,
.name = "cascade",
};
static void __iomem *icu1_base;
static void __iomem *icu2_base;
static unsigned char sysint1_assign[16] = {
0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
static unsigned char sysint2_assign[16] = {
2, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
#define SYSINT1REG_TYPE1 KSEG1ADDR(0x0b000080)
#define SYSINT2REG_TYPE1 KSEG1ADDR(0x0b000200)
#define ICU1_TYPE1_BASE 0x0b000080UL
#define ICU2_TYPE1_BASE 0x0b000200UL
#define SYSINT1REG_TYPE2 KSEG1ADDR(0x0f000080)
#define SYSINT2REG_TYPE2 KSEG1ADDR(0x0f0000a0)
#define ICU1_TYPE2_BASE 0x0f000080UL
#define ICU2_TYPE2_BASE 0x0f0000a0UL
#define ICU1_SIZE 0x20
#define ICU2_SIZE 0x1c
#define SYSINT1REG 0x00
#define PIUINTREG 0x02
......@@ -106,61 +95,61 @@ static unsigned char sysint2_assign[16] = {
#define SYSINT1_IRQ_TO_PIN(x) ((x) - SYSINT1_IRQ_BASE) /* Pin 0-15 */
#define SYSINT2_IRQ_TO_PIN(x) ((x) - SYSINT2_IRQ_BASE) /* Pin 0-15 */
#define read_icu1(offset) readw(icu1_base + (offset))
#define write_icu1(val, offset) writew((val), icu1_base + (offset))
#define INT_TO_IRQ(x) ((x) + 2) /* Int0-4 -> IRQ2-6 */
#define icu1_read(offset) readw(icu1_base + (offset))
#define icu1_write(offset, value) writew((value), icu1_base + (offset))
#define read_icu2(offset) readw(icu2_base + (offset))
#define write_icu2(val, offset) writew((val), icu2_base + (offset))
#define icu2_read(offset) readw(icu2_base + (offset))
#define icu2_write(offset, value) writew((value), icu2_base + (offset))
#define INTASSIGN_MAX 4
#define INTASSIGN_MASK 0x0007
static inline uint16_t set_icu1(uint8_t offset, uint16_t set)
static inline uint16_t icu1_set(uint8_t offset, uint16_t set)
{
uint16_t res;
uint16_t data;
res = read_icu1(offset);
res |= set;
write_icu1(res, offset);
data = icu1_read(offset);
data |= set;
icu1_write(offset, data);
return res;
return data;
}
static inline uint16_t clear_icu1(uint8_t offset, uint16_t clear)
static inline uint16_t icu1_clear(uint8_t offset, uint16_t clear)
{
uint16_t res;
uint16_t data;
res = read_icu1(offset);
res &= ~clear;
write_icu1(res, offset);
data = icu1_read(offset);
data &= ~clear;
icu1_write(offset, data);
return res;
return data;
}
static inline uint16_t set_icu2(uint8_t offset, uint16_t set)
static inline uint16_t icu2_set(uint8_t offset, uint16_t set)
{
uint16_t res;
uint16_t data;
res = read_icu2(offset);
res |= set;
write_icu2(res, offset);
data = icu2_read(offset);
data |= set;
icu2_write(offset, data);
return res;
return data;
}
static inline uint16_t clear_icu2(uint8_t offset, uint16_t clear)
static inline uint16_t icu2_clear(uint8_t offset, uint16_t clear)
{
uint16_t res;
uint16_t data;
res = read_icu2(offset);
res &= ~clear;
write_icu2(res, offset);
data = icu2_read(offset);
data &= ~clear;
icu2_write(offset, data);
return res;
return data;
}
/*=======================================================================*/
void vr41xx_enable_piuint(uint16_t mask)
{
irq_desc_t *desc = irq_desc + PIU_IRQ;
......@@ -169,7 +158,7 @@ void vr41xx_enable_piuint(uint16_t mask)
if (current_cpu_data.cputype == CPU_VR4111 ||
current_cpu_data.cputype == CPU_VR4121) {
spin_lock_irqsave(&desc->lock, flags);
set_icu1(MPIUINTREG, mask);
icu1_set(MPIUINTREG, mask);
spin_unlock_irqrestore(&desc->lock, flags);
}
}
......@@ -184,7 +173,7 @@ void vr41xx_disable_piuint(uint16_t mask)
if (current_cpu_data.cputype == CPU_VR4111 ||
current_cpu_data.cputype == CPU_VR4121) {
spin_lock_irqsave(&desc->lock, flags);
clear_icu1(MPIUINTREG, mask);
icu1_clear(MPIUINTREG, mask);
spin_unlock_irqrestore(&desc->lock, flags);
}
}
......@@ -199,7 +188,7 @@ void vr41xx_enable_aiuint(uint16_t mask)
if (current_cpu_data.cputype == CPU_VR4111 ||
current_cpu_data.cputype == CPU_VR4121) {
spin_lock_irqsave(&desc->lock, flags);
set_icu1(MAIUINTREG, mask);
icu1_set(MAIUINTREG, mask);
spin_unlock_irqrestore(&desc->lock, flags);
}
}
......@@ -214,7 +203,7 @@ void vr41xx_disable_aiuint(uint16_t mask)
if (current_cpu_data.cputype == CPU_VR4111 ||
current_cpu_data.cputype == CPU_VR4121) {
spin_lock_irqsave(&desc->lock, flags);
clear_icu1(MAIUINTREG, mask);
icu1_clear(MAIUINTREG, mask);
spin_unlock_irqrestore(&desc->lock, flags);
}
}
......@@ -229,7 +218,7 @@ void vr41xx_enable_kiuint(uint16_t mask)
if (current_cpu_data.cputype == CPU_VR4111 ||
current_cpu_data.cputype == CPU_VR4121) {
spin_lock_irqsave(&desc->lock, flags);
set_icu1(MKIUINTREG, mask);
icu1_set(MKIUINTREG, mask);
spin_unlock_irqrestore(&desc->lock, flags);
}
}
......@@ -244,7 +233,7 @@ void vr41xx_disable_kiuint(uint16_t mask)
if (current_cpu_data.cputype == CPU_VR4111 ||
current_cpu_data.cputype == CPU_VR4121) {
spin_lock_irqsave(&desc->lock, flags);
clear_icu1(MKIUINTREG, mask);
icu1_clear(MKIUINTREG, mask);
spin_unlock_irqrestore(&desc->lock, flags);
}
}
......@@ -257,7 +246,7 @@ void vr41xx_enable_dsiuint(uint16_t mask)
unsigned long flags;
spin_lock_irqsave(&desc->lock, flags);
set_icu1(MDSIUINTREG, mask);
icu1_set(MDSIUINTREG, mask);
spin_unlock_irqrestore(&desc->lock, flags);
}
......@@ -269,7 +258,7 @@ void vr41xx_disable_dsiuint(uint16_t mask)
unsigned long flags;
spin_lock_irqsave(&desc->lock, flags);
clear_icu1(MDSIUINTREG, mask);
icu1_clear(MDSIUINTREG, mask);
spin_unlock_irqrestore(&desc->lock, flags);
}
......@@ -281,7 +270,7 @@ void vr41xx_enable_firint(uint16_t mask)
unsigned long flags;
spin_lock_irqsave(&desc->lock, flags);
set_icu2(MFIRINTREG, mask);
icu2_set(MFIRINTREG, mask);
spin_unlock_irqrestore(&desc->lock, flags);
}
......@@ -293,7 +282,7 @@ void vr41xx_disable_firint(uint16_t mask)
unsigned long flags;
spin_lock_irqsave(&desc->lock, flags);
clear_icu2(MFIRINTREG, mask);
icu2_clear(MFIRINTREG, mask);
spin_unlock_irqrestore(&desc->lock, flags);
}
......@@ -308,7 +297,7 @@ void vr41xx_enable_pciint(void)
current_cpu_data.cputype == CPU_VR4131 ||
current_cpu_data.cputype == CPU_VR4133) {
spin_lock_irqsave(&desc->lock, flags);
write_icu2(PCIINT0, MPCIINTREG);
icu2_write(MPCIINTREG, PCIINT0);
spin_unlock_irqrestore(&desc->lock, flags);
}
}
......@@ -324,7 +313,7 @@ void vr41xx_disable_pciint(void)
current_cpu_data.cputype == CPU_VR4131 ||
current_cpu_data.cputype == CPU_VR4133) {
spin_lock_irqsave(&desc->lock, flags);
write_icu2(0, MPCIINTREG);
icu2_write(MPCIINTREG, 0);
spin_unlock_irqrestore(&desc->lock, flags);
}
}
......@@ -340,7 +329,7 @@ void vr41xx_enable_scuint(void)
current_cpu_data.cputype == CPU_VR4131 ||
current_cpu_data.cputype == CPU_VR4133) {
spin_lock_irqsave(&desc->lock, flags);
write_icu2(SCUINT0, MSCUINTREG);
icu2_write(MSCUINTREG, SCUINT0);
spin_unlock_irqrestore(&desc->lock, flags);
}
}
......@@ -356,7 +345,7 @@ void vr41xx_disable_scuint(void)
current_cpu_data.cputype == CPU_VR4131 ||
current_cpu_data.cputype == CPU_VR4133) {
spin_lock_irqsave(&desc->lock, flags);
write_icu2(0, MSCUINTREG);
icu2_write(MSCUINTREG, 0);
spin_unlock_irqrestore(&desc->lock, flags);
}
}
......@@ -372,7 +361,7 @@ void vr41xx_enable_csiint(uint16_t mask)
current_cpu_data.cputype == CPU_VR4131 ||
current_cpu_data.cputype == CPU_VR4133) {
spin_lock_irqsave(&desc->lock, flags);
set_icu2(MCSIINTREG, mask);
icu2_set(MCSIINTREG, mask);
spin_unlock_irqrestore(&desc->lock, flags);
}
}
......@@ -388,7 +377,7 @@ void vr41xx_disable_csiint(uint16_t mask)
current_cpu_data.cputype == CPU_VR4131 ||
current_cpu_data.cputype == CPU_VR4133) {
spin_lock_irqsave(&desc->lock, flags);
clear_icu2(MCSIINTREG, mask);
icu2_clear(MCSIINTREG, mask);
spin_unlock_irqrestore(&desc->lock, flags);
}
}
......@@ -404,7 +393,7 @@ void vr41xx_enable_bcuint(void)
current_cpu_data.cputype == CPU_VR4131 ||
current_cpu_data.cputype == CPU_VR4133) {
spin_lock_irqsave(&desc->lock, flags);
write_icu2(BCUINTR, MBCUINTREG);
icu2_write(MBCUINTREG, BCUINTR);
spin_unlock_irqrestore(&desc->lock, flags);
}
}
......@@ -420,30 +409,28 @@ void vr41xx_disable_bcuint(void)
current_cpu_data.cputype == CPU_VR4131 ||
current_cpu_data.cputype == CPU_VR4133) {
spin_lock_irqsave(&desc->lock, flags);
write_icu2(0, MBCUINTREG);
icu2_write(MBCUINTREG, 0);
spin_unlock_irqrestore(&desc->lock, flags);
}
}
EXPORT_SYMBOL(vr41xx_disable_bcuint);
/*=======================================================================*/
static unsigned int startup_sysint1_irq(unsigned int irq)
{
set_icu1(MSYSINT1REG, (uint16_t)1 << SYSINT1_IRQ_TO_PIN(irq));
icu1_set(MSYSINT1REG, 1 << SYSINT1_IRQ_TO_PIN(irq));
return 0; /* never anything pending */
}
static void shutdown_sysint1_irq(unsigned int irq)
{
clear_icu1(MSYSINT1REG, (uint16_t)1 << SYSINT1_IRQ_TO_PIN(irq));
icu1_clear(MSYSINT1REG, 1 << SYSINT1_IRQ_TO_PIN(irq));
}
static void enable_sysint1_irq(unsigned int irq)
{
set_icu1(MSYSINT1REG, (uint16_t)1 << SYSINT1_IRQ_TO_PIN(irq));
icu1_set(MSYSINT1REG, 1 << SYSINT1_IRQ_TO_PIN(irq));
}
#define disable_sysint1_irq shutdown_sysint1_irq
......@@ -452,7 +439,7 @@ static void enable_sysint1_irq(unsigned int irq)
static void end_sysint1_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
set_icu1(MSYSINT1REG, (uint16_t)1 << SYSINT1_IRQ_TO_PIN(irq));
icu1_set(MSYSINT1REG, 1 << SYSINT1_IRQ_TO_PIN(irq));
}
static struct hw_interrupt_type sysint1_irq_type = {
......@@ -465,23 +452,21 @@ static struct hw_interrupt_type sysint1_irq_type = {
.end = end_sysint1_irq,
};
/*=======================================================================*/
static unsigned int startup_sysint2_irq(unsigned int irq)
{
set_icu2(MSYSINT2REG, (uint16_t)1 << SYSINT2_IRQ_TO_PIN(irq));
icu2_set(MSYSINT2REG, 1 << SYSINT2_IRQ_TO_PIN(irq));
return 0; /* never anything pending */
}
static void shutdown_sysint2_irq(unsigned int irq)
{
clear_icu2(MSYSINT2REG, (uint16_t)1 << SYSINT2_IRQ_TO_PIN(irq));
icu2_clear(MSYSINT2REG, 1 << SYSINT2_IRQ_TO_PIN(irq));
}
static void enable_sysint2_irq(unsigned int irq)
{
set_icu2(MSYSINT2REG, (uint16_t)1 << SYSINT2_IRQ_TO_PIN(irq));
icu2_set(MSYSINT2REG, 1 << SYSINT2_IRQ_TO_PIN(irq));
}
#define disable_sysint2_irq shutdown_sysint2_irq
......@@ -490,7 +475,7 @@ static void enable_sysint2_irq(unsigned int irq)
static void end_sysint2_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
set_icu2(MSYSINT2REG, (uint16_t)1 << SYSINT2_IRQ_TO_PIN(irq));
icu2_set(MSYSINT2REG, 1 << SYSINT2_IRQ_TO_PIN(irq));
}
static struct hw_interrupt_type sysint2_irq_type = {
......@@ -503,8 +488,6 @@ static struct hw_interrupt_type sysint2_irq_type = {
.end = end_sysint2_irq,
};
/*=======================================================================*/
static inline int set_sysint1_assign(unsigned int irq, unsigned char assign)
{
irq_desc_t *desc = irq_desc + irq;
......@@ -515,8 +498,8 @@ static inline int set_sysint1_assign(unsigned int irq, unsigned char assign)
spin_lock_irq(&desc->lock);
intassign0 = read_icu1(INTASSIGN0);
intassign1 = read_icu1(INTASSIGN1);
intassign0 = icu1_read(INTASSIGN0);
intassign1 = icu1_read(INTASSIGN1);
switch (pin) {
case 0:
......@@ -556,8 +539,8 @@ static inline int set_sysint1_assign(unsigned int irq, unsigned char assign)
}
sysint1_assign[pin] = assign;
write_icu1(intassign0, INTASSIGN0);
write_icu1(intassign1, INTASSIGN1);
icu1_write(INTASSIGN0, intassign0);
icu1_write(INTASSIGN1, intassign1);
spin_unlock_irq(&desc->lock);
......@@ -574,8 +557,8 @@ static inline int set_sysint2_assign(unsigned int irq, unsigned char assign)
spin_lock_irq(&desc->lock);
intassign2 = read_icu1(INTASSIGN2);
intassign3 = read_icu1(INTASSIGN3);
intassign2 = icu1_read(INTASSIGN2);
intassign3 = icu1_read(INTASSIGN3);
switch (pin) {
case 0:
......@@ -623,8 +606,8 @@ static inline int set_sysint2_assign(unsigned int irq, unsigned char assign)
}
sysint2_assign[pin] = assign;
write_icu1(intassign2, INTASSIGN2);
write_icu1(intassign3, INTASSIGN3);
icu1_write(INTASSIGN2, intassign2);
icu1_write(INTASSIGN3, intassign3);
spin_unlock_irq(&desc->lock);
......@@ -651,88 +634,92 @@ int vr41xx_set_intassign(unsigned int irq, unsigned char intassign)
EXPORT_SYMBOL(vr41xx_set_intassign);
/*=======================================================================*/
asmlinkage void irq_dispatch(unsigned char intnum, struct pt_regs *regs)
static int icu_get_irq(unsigned int irq, struct pt_regs *regs)
{
uint16_t pend1, pend2;
uint16_t mask1, mask2;
int i;
pend1 = read_icu1(SYSINT1REG);
mask1 = read_icu1(MSYSINT1REG);
pend1 = icu1_read(SYSINT1REG);
mask1 = icu1_read(MSYSINT1REG);
pend2 = read_icu2(SYSINT2REG);
mask2 = read_icu2(MSYSINT2REG);
pend2 = icu2_read(SYSINT2REG);
mask2 = icu2_read(MSYSINT2REG);
mask1 &= pend1;
mask2 &= pend2;
if (mask1) {
for (i = 0; i < 16; i++) {
if (intnum == sysint1_assign[i] &&
(mask1 & ((uint16_t)1 << i))) {
if (i == 8)
giuint_irq_dispatch(regs);
else
do_IRQ(SYSINT1_IRQ(i), regs);
return;
}
if (irq == INT_TO_IRQ(sysint1_assign[i]) && (mask1 & (1 << i)))
return SYSINT1_IRQ(i);
}
}
if (mask2) {
for (i = 0; i < 16; i++) {
if (intnum == sysint2_assign[i] &&
(mask2 & ((uint16_t)1 << i))) {
do_IRQ(SYSINT2_IRQ(i), regs);
return;
}
if (irq == INT_TO_IRQ(sysint2_assign[i]) && (mask2 & (1 << i)))
return SYSINT2_IRQ(i);
}
}
printk(KERN_ERR "spurious ICU interrupt: %04x,%04x\n", pend1, pend2);
atomic_inc(&irq_err_count);
}
/*=======================================================================*/
return -1;
}
static int __init vr41xx_icu_init(void)
{
unsigned long icu1_start, icu2_start;
int i;
switch (current_cpu_data.cputype) {
case CPU_VR4111:
case CPU_VR4121:
icu1_base = SYSINT1REG_TYPE1;
icu2_base = SYSINT2REG_TYPE1;
icu1_start = ICU1_TYPE1_BASE;
icu2_start = ICU2_TYPE1_BASE;
break;
case CPU_VR4122:
case CPU_VR4131:
case CPU_VR4133:
icu1_base = SYSINT1REG_TYPE2;
icu2_base = SYSINT2REG_TYPE2;
icu1_start = ICU1_TYPE2_BASE;
icu2_start = ICU2_TYPE2_BASE;
break;
default:
printk(KERN_ERR "ICU: Unexpected CPU of NEC VR4100 series\n");
return -EINVAL;
return -ENODEV;
}
write_icu1(0, MSYSINT1REG);
write_icu1(0xffff, MGIUINTLREG);
if (request_mem_region(icu1_start, ICU1_SIZE, "ICU") == NULL)
return -EBUSY;
write_icu2(0, MSYSINT2REG);
write_icu2(0xffff, MGIUINTHREG);
if (request_mem_region(icu2_start, ICU2_SIZE, "ICU") == NULL) {
release_mem_region(icu1_start, ICU1_SIZE);
return -EBUSY;
}
return 0;
}
icu1_base = ioremap(icu1_start, ICU1_SIZE);
if (icu1_base == NULL) {
release_mem_region(icu1_start, ICU1_SIZE);
release_mem_region(icu2_start, ICU2_SIZE);
return -ENOMEM;
}
early_initcall(vr41xx_icu_init);
icu2_base = ioremap(icu2_start, ICU2_SIZE);
if (icu2_base == NULL) {
iounmap(icu1_base);
release_mem_region(icu1_start, ICU1_SIZE);
release_mem_region(icu2_start, ICU2_SIZE);
return -ENOMEM;
}
/*=======================================================================*/
icu1_write(MSYSINT1REG, 0);
icu1_write(MGIUINTLREG, 0xffff);
static inline void init_vr41xx_icu_irq(void)
{
int i;
icu2_write(MSYSINT2REG, 0);
icu2_write(MGIUINTHREG, 0xffff);
for (i = SYSINT1_IRQ_BASE; i <= SYSINT1_IRQ_LAST; i++)
irq_desc[i].handler = &sysint1_irq_type;
......@@ -740,18 +727,13 @@ static inline void init_vr41xx_icu_irq(void)
for (i = SYSINT2_IRQ_BASE; i <= SYSINT2_IRQ_LAST; i++)
irq_desc[i].handler = &sysint2_irq_type;
setup_irq(INT0_CASCADE_IRQ, &icu_cascade);
setup_irq(INT1_CASCADE_IRQ, &icu_cascade);
setup_irq(INT2_CASCADE_IRQ, &icu_cascade);
setup_irq(INT3_CASCADE_IRQ, &icu_cascade);
setup_irq(INT4_CASCADE_IRQ, &icu_cascade);
}
cascade_irq(INT0_IRQ, icu_get_irq);
cascade_irq(INT1_IRQ, icu_get_irq);
cascade_irq(INT2_IRQ, icu_get_irq);
cascade_irq(INT3_IRQ, icu_get_irq);
cascade_irq(INT4_IRQ, icu_get_irq);
void __init arch_init_irq(void)
{
mips_cpu_irq_init(MIPS_CPU_IRQ_BASE);
init_vr41xx_icu_irq();
init_vr41xx_giuint_irq();
set_except_vector(0, vr41xx_handle_interrupt);
return 0;
}
core_initcall(vr41xx_icu_init);
......@@ -71,24 +71,24 @@
andi t1, t0, CAUSEF_IP3 # check for Int1
bnez t1, handle_int
li a0, 1
li a0, 3
andi t1, t0, CAUSEF_IP4 # check for Int2
bnez t1, handle_int
li a0, 2
li a0, 4
andi t1, t0, CAUSEF_IP5 # check for Int3
bnez t1, handle_int