From: "Siddha, Suresh B" <[email protected]>
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.
Signed-off-by: Suresh Siddha <[email protected]>
Signed-off-by: Andi Kleen <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Andrew Morton <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
include/asm-i386/mach-default/mach_apicdef.h | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
Index: linux/include/asm-i386/mach-default/mach_apicdef.h
===================================================================
--- linux.orig/include/asm-i386/mach-default/mach_apicdef.h
+++ linux/include/asm-i386/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)
-
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