xv6/trap.c

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#include "types.h"
#include "param.h"
#include "mmu.h"
#include "proc.h"
#include "defs.h"
#include "x86.h"
struct Gatedesc idt[256];
struct Pseudodesc idt_pd = { 0, sizeof(idt) - 1, (unsigned) &idt };
extern unsigned vectors[]; /* vectors.S, array of 256 entry point addresses */
extern void trapenter();
extern void trapenter1();
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int xx;
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void
tinit()
{
int i;
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xx = 0;
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for(i = 0; i < 256; i++){
SETGATE(idt[i], 1, SEG_KCODE << 3, vectors[i], 3);
}
asm volatile("lidt %0" : : "g" (idt_pd.pd_lim));
}
void
trap(struct Trapframe *tf)
{
/* which process are we running? */
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if(xx < 10)
cprintf("%d\n", tf->tf_trapno);
xx++;
//while(1)
//;
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// XXX probably ought to lgdt on trap return
}