#include "threads/flags.h"
#include "threads/intr-stubs.h"
#include "threads/io.h"
-#include "threads/mmu.h"
#include "threads/thread.h"
+#include "threads/vaddr.h"
#include "devices/timer.h"
/* Number of x86 interrupts. */
/* Disable interrupts by clearing the interrupt flag.
See [IA32-v2b] "CLI" and [IA32-v3a] 5.8.1 "Masking Maskable
Hardware Interrupts". */
- asm volatile ("cli");
+ asm volatile ("cli" : : : "memory");
return old_level;
}
See [IA32-v2a] "LIDT" and [IA32-v3a] 5.10 "Interrupt
Descriptor Table (IDT)". */
idtr_operand = make_idtr_operand (sizeof idt - 1, idt);
- asm volatile ("lidt %0" :: "m" (idtr_operand));
+ asm volatile ("lidt %0" : : "m" (idtr_operand));
/* Initialize intr_names. */
for (i = 0; i < INTR_CNT; i++)
yield_on_return = false;
}
- /* Invoke the interrupt's handler.
- If there is no handler, invoke the unexpected interrupt
- handler. */
+ /* Invoke the interrupt's handler. */
handler = intr_handlers[frame->vec_no];
- if (handler == NULL)
+ if (handler != NULL)
+ handler (frame);
+ else if (frame->vec_no == 0x27 || frame->vec_no == 0x2f)
{
+ /* There is no handler, but this interrupt can trigger
+ spuriously due to a hardware fault or hardware race
+ condition. Ignore it. */
+ }
+ else
+ {
+ /* No handler and not spurious. Invoke the unexpected
+ interrupt handler. */
intr_dump_frame (frame);
- PANIC ("Unexpected interrupt");
+ PANIC ("Unexpected interrupt");
}
- handler (frame);
/* Complete the processing of an external interrupt. */
if (external)