run without lapic and ioapic, if they are not present

if no lapic available, use 8253pit for clock
now xv6 runs both on qemu (uniprocessor) and bochs (uniprocessor and MP)

1 files changed, 1 insertions, 0 deletions

diff --git a/ide.c b/ide.c
index f0fd0f9..4e2e1a6 100644
--- a/ide.c
+++ b/ide.c
@@ -50,6 +50,7 @@ void
 ide_init(void)
 {
   initlock(&ide_lock, "ide");
+  irq_setmask_8259A(irq_mask_8259A & ~(1 << IRQ_IDE));
   ioapic_enable (IRQ_IDE, ncpu - 1);
   ide_wait_ready(0);
   disk_1_present = ide_probe_disk1();