diff options
Diffstat (limited to 'sys/include/arch/amd64')
| -rw-r--r-- | sys/include/arch/amd64/lapicvar.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/sys/include/arch/amd64/lapicvar.h b/sys/include/arch/amd64/lapicvar.h index 67cb277..6c2c37f 100644 --- a/sys/include/arch/amd64/lapicvar.h +++ b/sys/include/arch/amd64/lapicvar.h @@ -79,7 +79,13 @@ #define LAPIC_SW_ENABLE (__BIT(8) | 0xFF) #define x2APIC_ENABLE_SHIFT 10 -/* The initial logical APIC ID to be set */ +/* + * The initial logical APIC ID to be set + * + * XXX: This value does *not* apply to processors + * that support x2APIC mode. In x2APIC mode + * the LDR register is readonly to system software. + */ #define LAPIC_STARTUP_LID 0x1 /* LVT bits */ |