95 lines
2 KiB
C
95 lines
2 KiB
C
#include "types.h"
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#include "param.h"
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#include "mmu.h"
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#include "proc.h"
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#include "defs.h"
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#include "x86.h"
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#include "traps.h"
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#include "syscall.h"
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struct gatedesc idt[256];
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extern uint vectors[]; // in vectors.S: array of 256 entry point addresses
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extern void trapenter(void);
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extern void trapenter1(void);
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void
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tvinit(void)
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{
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int i;
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for(i = 0; i < 256; i++){
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SETGATE(idt[i], 1, SEG_KCODE << 3, vectors[i], 0);
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}
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SETGATE(idt[T_SYSCALL], 1, SEG_KCODE << 3, vectors[T_SYSCALL], 3);
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}
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void
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idtinit(void)
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{
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lidt(idt, sizeof idt);
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}
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void
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trap(struct trapframe *tf)
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{
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int v = tf->trapno;
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if(v == T_SYSCALL){
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struct proc *cp = curproc[cpu()];
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if(cp->killed)
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proc_exit();
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cp->tf = tf;
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syscall();
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if(cp->killed)
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proc_exit();
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return;
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}
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if(v == (IRQ_OFFSET + IRQ_TIMER)){
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struct proc *cp = curproc[cpu()];
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lapic_timerintr();
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if(cp){
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// Force process exit if it has been killed
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// and the interrupt came from user space.
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// (If the kernel was executing at time of interrupt,
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// don't kill the process. Let the process get back
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// out to its regular system call return.)
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if((tf->cs&3) == 3 && cp->killed)
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proc_exit();
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// Force process to give up CPU and let others run.
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if(cp->state == RUNNING)
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yield();
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}
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return;
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}
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if(v == (IRQ_OFFSET + IRQ_IDE)){
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ide_intr();
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cli(); // prevent a waiting interrupt from overflowing stack
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lapic_eoi();
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return;
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}
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if(v == (IRQ_OFFSET + IRQ_KBD)){
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kbd_intr();
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cli(); // prevent a waiting interrupt from overflowing stack
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lapic_eoi();
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return;
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}
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if(v == (IRQ_OFFSET + IRQ_SPURIOUS)){
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cprintf("spurious interrupt from cpu %d eip %x\n", cpu(), tf->eip);
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return; // no eoi for this one.
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}
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if(curproc[cpu()]) {
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cprintf("pid %d: unhandled trap %d on cpu %d eip %x---terminate process\n",
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curproc[cpu()]->pid, v, cpu(), tf->eip);
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proc_exit();
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}
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cprintf("unexpected trap %d from cpu %d eip %x\n", v, cpu(), tf->eip);
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panic("trap");
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}
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