1 #include "types.h" 2 #include "param.h" 3 #include "mmu.h" 4 #include "proc.h" 5 #include "defs.h" 6 #include "x86.h" 7 #include "traps.h" 8 9 struct Gatedesc idt[256]; 10 struct Pseudodesc idt_pd = { 0, sizeof(idt) - 1, (unsigned) &idt }; 11 extern unsigned vectors[]; /* vectors.S, array of 256 entry point addresses */ 12 13 extern void trapenter(); 14 extern void trapenter1(); 15 16 void 17 tinit() 18 { 19 int i; 20 21 for(i = 0; i < 256; i++){ 22 SETGATE(idt[i], 1, SEG_KCODE << 3, vectors[i], 0); 23 } 24 SETGATE(idt[T_SYSCALL], T_SYSCALL, SEG_KCODE << 3, vectors[48], 3); 25 asm volatile("lidt %0" : : "g" (idt_pd.pd_lim)); 26 } 27 28 void 29 trap(struct Trapframe *tf) 30 { 31 int v = tf->tf_trapno; 32 cprintf("trap %d eip %x:%x\n", tf->tf_trapno, tf->tf_cs, tf->tf_eip); 33 34 if(v == T_SYSCALL){ 35 curproc->tf = tf; 36 syscall(); 37 return; 38 } 39 40 if(v == 32){ 41 // probably clock 42 return; 43 } 44 45 while(1) 46 ; 47 // XXX probably ought to lgdt on trap return 48 } 49