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| author | Siddha, Suresh B <suresh.b.siddha@intel.com> | 2007-10-17 20:04:33 +0400 |
|---|---|---|
| committer | Thomas Gleixner <tglx@inhelltoy.tec.linutronix.de> | 2007-10-17 22:15:24 +0400 |
| commit | 58d5fa7a6a6fc4754d295d0999b284edd67c8620 (patch) | |
| tree | 19d1ff3dbb73503d3ed45a2c43cb9167e822ec68 | |
| parent | 801916c1b369b637ce799e6c71a94963ff63df79 (diff) | |
| download | linux-58d5fa7a6a6fc4754d295d0999b284edd67c8620.tar.xz | |
i386: fix 4 bit apicid assumption of mach-default
Fix get_apic_id() in mach-default, so that it uses 8 bits incase of
xAPIC case and 4 bits for legacy APIC case.
This fixes the i386 kernel assumption that apic id is less than 16 for
xAPIC platforms with 8 cpus or less and makes the kernel boot on such
platforms.
[ tglx: arch/x86 adaptation ]
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | include/asm-x86/mach-default/mach_apicdef.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/include/asm-x86/mach-default/mach_apicdef.h b/include/asm-x86/mach-default/mach_apicdef.h index 7bcb350c3ee8..ae9841319094 100644 --- a/include/asm-x86/mach-default/mach_apicdef.h +++ b/include/asm-x86/mach-default/mach_apicdef.h @@ -1,11 +1,17 @@ #ifndef __ASM_MACH_APICDEF_H #define __ASM_MACH_APICDEF_H +#include <asm/apic.h> + #define APIC_ID_MASK (0xF<<24) static inline unsigned get_apic_id(unsigned long x) { - return (((x)>>24)&0xF); + unsigned int ver = GET_APIC_VERSION(apic_read(APIC_LVR)); + if (APIC_XAPIC(ver)) + return (((x)>>24)&0xFF); + else + return (((x)>>24)&0xF); } #define GET_APIC_ID(x) get_apic_id(x) |