x86: apic - unify verify_local_APIC

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
git-mirror · Aug 15, 2008 · c93baa1 · c93baa1
1 parent 64e474d
commit c93baa1
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c
@@ -878,6 +878,12 @@ int __init verify_local_APIC(void)
 	 */
 	reg0 = apic_read(APIC_ID);
 	apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0);
+	apic_write(APIC_ID, reg0 ^ APIC_ID_MASK);
+	reg1 = apic_read(APIC_ID);
+	apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg1);
+	apic_write(APIC_ID, reg0);
+	if (reg1 != (reg0 ^ APIC_ID_MASK))
+		return 0;
 
 	/*
 	 * The next two are just to see if we have sane values.