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i386: fix 4 bit apicid assumption of mach-default

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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>
This commit is contained in:
Siddha, Suresh B 2007-10-17 18:04:33 +02:00 committed by Thomas Gleixner
parent 801916c1b3
commit 58d5fa7a6a
1 changed files with 7 additions and 1 deletions
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8
include/asm-x86/mach-default/mach_apicdef.h
View file

@ -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)