From 58d5fa7a6a6fc4754d295d0999b284edd67c8620 Mon Sep 17 00:00:00 2001 From: "Siddha, Suresh B" Date: Wed, 17 Oct 2007 18:04:33 +0200 Subject: [PATCH] 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 Signed-off-by: Andi Kleen Cc: Andi Kleen Cc: Andrew Morton Signed-off-by: Andrew Morton Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- include/asm-x86/mach-default/mach_apicdef.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/include/asm-x86/mach-default/mach_apicdef.h b/include/asm-x86/mach-default/mach_apicdef.h index 7bcb350c3e..ae98413190 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 + #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) -- 2.39.5