52 lines
997 B
C
52 lines
997 B
C
#include "types.h"
|
|
#include "param.h"
|
|
#include "mmu.h"
|
|
#include "proc.h"
|
|
#include "defs.h"
|
|
#include "x86.h"
|
|
#include "traps.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();
|
|
|
|
void
|
|
tinit()
|
|
{
|
|
int i;
|
|
|
|
for(i = 0; i < 256; i++){
|
|
SETGATE(idt[i], 1, SEG_KCODE << 3, vectors[i], 0);
|
|
}
|
|
SETGATE(idt[T_SYSCALL], T_SYSCALL, SEG_KCODE << 3, vectors[48], 3);
|
|
asm volatile("lidt %0" : : "g" (idt_pd.pd_lim));
|
|
}
|
|
|
|
void
|
|
trap(struct Trapframe *tf)
|
|
{
|
|
int v = tf->tf_trapno;
|
|
|
|
acquire_spinlock(&kernel_lock); // released in trapret in trapasm.S
|
|
|
|
cprintf("trap %d eip %x:%x\n", tf->tf_trapno, tf->tf_cs, tf->tf_eip);
|
|
|
|
if(v == T_SYSCALL){
|
|
curproc[cpu()]->tf = tf;
|
|
syscall();
|
|
return;
|
|
}
|
|
|
|
if(v == 32){
|
|
// probably clock
|
|
return;
|
|
}
|
|
|
|
while(1)
|
|
;
|
|
// XXX probably ought to lgdt on trap return
|
|
}
|