foo

trap.c

+#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();
+
+void
+tinit()
+{
+  int i;
+
+  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? */
+  cprintf("trap %d tf %x\n", tf->tf_trapno, tf);
+  while(1)
+    ;
+  // XXX probably ought to lgdt on trap return
+}