// irq_init(): 初始化硬件中断服务
void irq_init(void)
{
int i;
// 硬件中断芯片初始化
init8259();
// 设置 idt 服务程序
idt_setintrgate(IRQBASE + 0, irq0);
idt_setintrgate(IRQBASE + 1, irq1);
idt_setintrgate(IRQBASE + 2, irq2);
idt_setintrgate(IRQBASE + 3, irq3);
idt_setintrgate(IRQBASE + 4, irq4);
idt_setintrgate(IRQBASE + 5, irq5);
idt_setintrgate(IRQBASE + 6, irq6);
idt_setintrgate(IRQBASE + 7, irq7);
idt_setintrgate(IRQBASE + 8, irq8);
idt_setintrgate(IRQBASE + 9, irq9);
idt_setintrgate(IRQBASE + 10, irq10);
idt_setintrgate(IRQBASE + 11, irq11);
idt_setintrgate(IRQBASE + 12, irq12);
idt_setintrgate(IRQBASE + 13, irq13);
idt_setintrgate(IRQBASE + 14, irq14);
idt_setintrgate(IRQBASE + 15, irq15);
// 初始化处理函数组，这里是自己赋值
for (i = 0; i < sizeof(irqfun) / sizeof(irqfun[0]); i++)
irqfun[i] = (IRQ_FUN)unexpected;
//设置系统调用
extern int *systemcall;
extern void irq_syscall(void);
idt_setusergate(SYSCALL_INT ,irq_syscall);
return;
}
initevec()
{
int i;
STATWORD ps;
#ifdef __COM32__
puts_com32("initevec() begin");
#endif
for (i=0; i<NID; ++i)
set_evec(i, (int)defevec[i]);
/*
* "girmask" masks all (bus) interrupts with the default handler.
* initially, all, then cleared as handlers are set via set_evec()
*/
girmask = 0xfffb; /* leave bit 2 enabled for IC cascade */
#ifdef __COM32__
puts_com32("initevec() set_evec() done\n");
#endif
lidt();
#ifdef __COM32__
puts_com32("initevec() lidt() done\n");
#endif
init8259();
#ifdef __COM32__
puts_com32("initevec() init8259() done\n");
#endif
}
void initevec(void)
{
int i;
/* bzero( idt, sizeof( struct idt ) * 256 ); */
memset( idt, 0, sizeof( struct idt ) * 256 );
for (i=0; i<NID; ++i)
set_evec(i, (long)defevec[i]);
lidt();
init8259();
set_exception=&set_evec;
}
int initevec()
{
int i;
for (i=0; i<NID; ++i)
set_evec(i, (long)defevec[i]);
/*
* "girmask" masks all (bus) interrupts with the default handler.
* initially, all, then cleared as handlers are set via set_evec()
*/
girmask = 0xfffb; /* leave bit 2 enabled for IC cascade */
lidt();
init8259();
return(OK);
}
