diff options
| -rw-r--r-- | src/arch/x86/lib/ioapic.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/arch/x86/lib/ioapic.c b/src/arch/x86/lib/ioapic.c index 018a42c173..e05d80c7a6 100644 --- a/src/arch/x86/lib/ioapic.c +++ b/src/arch/x86/lib/ioapic.c @@ -43,8 +43,11 @@ void clear_ioapic(u32 ioapic_base) /* Read the available number of interrupts. */ ioapic_interrupts = (io_apic_read(ioapic_base, 0x01) >> 16) & 0xff; - if (!ioapic_interrupts || ioapic_interrupts == 0xff) - ioapic_interrupts = 24; + if (ioapic_interrupts == 0xff) + ioapic_interrupts = 23; + ioapic_interrupts += 1; /* Bits 23-16 specify the maximum redirection + entry, which is the number of interrupts + minus 1. */ printk(BIOS_DEBUG, "IOAPIC: %d interrupts\n", ioapic_interrupts); low = DISABLED; |