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authorSuresh Siddha <suresh.b.siddha@intel.com>2008-07-10 14:16:58 -0400
committerIngo Molnar <mingo@elte.hu>2008-07-12 02:45:06 -0400
commit6e1cb38a2aef7680975e71f23de187859ee8b158 (patch)
tree4044df869c6314dcdac700f3fdd3cc256cc9d3a7 /Documentation
parent75c46fa61bc5b4ccd20a168ff325c58771248fcd (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 'Documentation')
-rw-r--r--Documentation/kernel-parameters.txt2
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
1377 1377
1378 nolapic_timer [X86-32,APIC] Do not use the local APIC timer. 1378 nolapic_timer [X86-32,APIC] Do not use the local APIC timer.
1379 1379
1380 nox2apic [X86-64,APIC] Do not enable x2APIC mode.
1381
1380 noltlbs [PPC] Do not use large page/tlb entries for kernel 1382 noltlbs [PPC] Do not use large page/tlb entries for kernel
1381 lowmem mapping on PPC40x. 1383 lowmem mapping on PPC40x.
1382 1384