diff options
Diffstat (limited to 'sys/x86/include/apicvar.h')
| -rw-r--r-- | sys/x86/include/apicvar.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/sys/x86/include/apicvar.h b/sys/x86/include/apicvar.h index 10016e291b9b..ac6a82659e34 100644 --- a/sys/x86/include/apicvar.h +++ b/sys/x86/include/apicvar.h @@ -78,7 +78,12 @@ #define MAX_APIC_ID 0x800 #define APIC_ID_ALL 0xffffffff -#define IOAPIC_MAX_ID xAPIC_MAX_APIC_ID +/* + * The 0xff ID is used for broadcast IPIs for local APICs when not using + * x2APIC. IPIs are not sent to I/O APICs so it's acceptable for an I/O APIC + * to use that ID. + */ +#define IOAPIC_MAX_ID 0xff /* I/O Interrupts are used for external devices such as ISA, PCI, etc. */ #define APIC_IO_INTS (IDT_IO_INTS + 16) |