- /* Most exceptions require ring 0.
- Exceptions 3, 4, and 5 can be caused by ring 3 directly. */
- intr_register (0, 0, INTR_ON, kill, "#DE Divide Error");
- intr_register (1, 0, INTR_ON, kill, "#DB Debug Exception");
- intr_register (2, 0, INTR_ON, panic, "NMI Interrupt");
- intr_register (3, 3, INTR_ON, kill, "#BP Breakpoint Exception");
- intr_register (4, 3, INTR_ON, kill, "#OF Overflow Exception");
- intr_register (5, 3, INTR_ON, kill, "#BR BOUND Range Exceeded Exception");
- intr_register (6, 0, INTR_ON, kill, "#UD Invalid Opcode Exception");
- intr_register (7, 0, INTR_ON, kill, "#NM Device Not Available Exception");
- intr_register (8, 0, INTR_ON, panic, "#DF Double Fault Exception");
- intr_register (9, 0, INTR_ON, panic, "Coprocessor Segment Overrun");
- intr_register (10, 0, INTR_ON, panic, "#TS Invalid TSS Exception");
- intr_register (11, 0, INTR_ON, kill, "#NP Segment Not Present");
- intr_register (12, 0, INTR_ON, kill, "#SS Stack Fault Exception");
- intr_register (13, 0, INTR_ON, kill, "#GP General Protection Exception");
- intr_register (16, 0, INTR_ON, kill, "#MF x87 FPU Floating-Point Error");
- intr_register (17, 0, INTR_ON, panic, "#AC Alignment Check Exception");
- intr_register (18, 0, INTR_ON, panic, "#MC Machine-Check Exception");
- intr_register (19, 0, INTR_ON, kill, "#XF SIMD Floating-Point Exception");
-
- /* Most exceptions can be handled with interrupts turned on.
- We need to disable interrupts for page faults because the
- fault address is stored in CR2 and needs to be preserved. */
- intr_register (14, 0, INTR_OFF, kill, "#PF Page-Fault Exception");
-
- idtr_operand = make_dtr_operand (sizeof idt - 1, idt);
- asm volatile ("lidt %0" :: "m" (idtr_operand));
+/* Registers interrupt VEC_NO to invoke HANDLER with descriptor
+ privilege level DPL. Names the interrupt NAME for debugging
+ purposes. The interrupt handler will be invoked with
+ interrupt status set to LEVEL. */
+static void
+register_handler (uint8_t vec_no, int dpl, enum intr_level level,
+ intr_handler_func *handler, const char *name)
+{
+ ASSERT (intr_handlers[vec_no] == NULL);
+ if (level == INTR_ON)
+ idt[vec_no] = make_trap_gate (intr_stubs[vec_no], dpl);
+ else
+ idt[vec_no] = make_intr_gate (intr_stubs[vec_no], dpl);
+ intr_handlers[vec_no] = handler;
+ intr_names[vec_no] = name;