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[PATCH] x86_64: x86_64 write apic id fix

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o Apic id is in most significant 8 bits of APIC_ID register. Current code
  is trying to write apic id to least significant 8 bits. This patch fixes
  it.

o This fix enables booting uni kdump capture kernel on a cpu with non-zero
  apic id.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Vivek Goyal 2006-01-11 22:45:09 +01:00 committed by Linus Torvalds
parent aea9fca1dc
commit b9d1e4bd6e
2 changed files with 2 additions and 1 deletions
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2
arch/x86_64/kernel/apic.c
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@ -1066,7 +1066,7 @@ int __init APIC_init_uniprocessor (void)
connect_bsp_APIC();
phys_cpu_present_map = physid_mask_of_physid(boot_cpu_id);
apic_write_around(APIC_ID, boot_cpu_id);
apic_write_around(APIC_ID, SET_APIC_ID(boot_cpu_id));
setup_local_APIC();

1
include/asm-x86_64/apicdef.h
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@ -13,6 +13,7 @@
#define APIC_ID 0x20
#define APIC_ID_MASK (0xFFu<<24)
#define GET_APIC_ID(x) (((x)>>24)&0xFFu)
#define SET_APIC_ID(x) (((x)<<24))
#define APIC_LVR 0x30
#define APIC_LVR_MASK 0xFF00FF
#define GET_APIC_VERSION(x) ((x)&0xFFu)