diff options
| author | Suresh Siddha <suresh.b.siddha@intel.com> | 2008-07-10 11:16:58 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-12 08:45:06 +0200 |
| commit | 6e1cb38a2aef7680975e71f23de187859ee8b158 (patch) | |
| tree | 4044df869c6314dcdac700f3fdd3cc256cc9d3a7 /arch/x86/kernel/cpu/common_64.c | |
| parent | 75c46fa61bc5b4ccd20a168ff325c58771248fcd (diff) | |
x64, x2apic/intr-remap: add x2apic support, including enabling interrupt-remapping
x2apic support. Interrupt-remapping must be enabled before enabling x2apic,
this is needed to ensure that IO interrupts continue to work properly after the
cpu mode is changed to x2apic(which uses 32bit extended physical/cluster
apic id).
On systems where apicid's are > 255, BIOS can handover the control to OS in
x2apic mode. Or if the OS handover was in legacy xapic mode, check
if it is capable of x2apic mode. And if we succeed in enabling
Interrupt-remapping, then we can enable x2apic mode in the CPU.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: akpm@linux-foundation.org
Cc: arjan@linux.intel.com
Cc: andi@firstfloor.org
Cc: ebiederm@xmission.com
Cc: jbarnes@virtuousgeek.org
Cc: steiner@sgi.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/cpu/common_64.c')
| -rw-r--r-- | arch/x86/kernel/cpu/common_64.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/common_64.c b/arch/x86/kernel/cpu/common_64.c index 36537ab9e56..e7bf3c2dc5f 100644 --- a/arch/x86/kernel/cpu/common_64.c +++ b/arch/x86/kernel/cpu/common_64.c @@ -606,6 +606,8 @@ void __cpuinit cpu_init(void) barrier(); check_efer(); + if (cpu != 0 && x2apic) + enable_x2apic(); /* * set up and load the per-CPU TSS |