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| 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 /Documentation/kernel-parameters.txt | |
| parent | 75c46fa61bc5b4ccd20a168ff325c58771248fcd (diff) | |
| download | lwn-6e1cb38a2aef7680975e71f23de187859ee8b158.tar.gz lwn-6e1cb38a2aef7680975e71f23de187859ee8b158.zip | |
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 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 795c487af8e4..56689ef1a159 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1377,6 +1377,8 @@ and is between 256 and 4096 characters. It is defined in the file nolapic_timer [X86-32,APIC] Do not use the local APIC timer. + nox2apic [X86-64,APIC] Do not enable x2APIC mode. + noltlbs [PPC] Do not use large page/tlb entries for kernel lowmem mapping on PPC40x. |