[patch 8/8] x86: apic - unify init_bsp_APIC

[Cyrill Gorcunov]

Remove redundant apic_read(APIC_LVR) and add check for
reserved bit on P4/Xeon in 64bit mode. For now it's
not really needed and made in a sake of unification.
#ifdef would be added probably.

Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxx>
---

Index: linux-2.6.git/arch/x86/kernel/apic_32.c
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/apic_32.c	2008-08-14 22:23:04.000000000 +0400
+++ linux-2.6.git/arch/x86/kernel/apic_32.c	2008-08-14 22:24:49.000000000 +0400
@@ -927,7 +927,7 @@ void __init sync_Arb_IDs(void)
  */
 void __init init_bsp_APIC(void)
 {
-	unsigned long value;
+	unsigned int value;
 
 	/*
 	 * Don't do the setup now if we have a SMP BIOS as the
@@ -962,7 +962,8 @@ void __init init_bsp_APIC(void)
 	 */
 	apic_write(APIC_LVT0, APIC_DM_EXTINT);
 	value = APIC_DM_NMI;
-	if (!lapic_is_integrated())		/* 82489DX */
+	/* discrete on 82489DX */
+	if (!lapic_is_integrated())
 		value |= APIC_LVT_LEVEL_TRIGGER;
 	apic_write(APIC_LVT1, value);
 }
Index: linux-2.6.git/arch/x86/kernel/apic_64.c
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/apic_64.c	2008-08-14 22:23:04.000000000 +0400
+++ linux-2.6.git/arch/x86/kernel/apic_64.c	2008-08-14 22:24:49.000000000 +0400
@@ -776,8 +776,6 @@ void __init init_bsp_APIC(void)
 	if (smp_found_config || !cpu_has_apic)
 		return;
 
-	value = apic_read(APIC_LVR);
-
 	/*
 	 * Do not trust the local APIC being empty at bootup.
 	 */
@@ -789,7 +787,12 @@ void __init init_bsp_APIC(void)
 	value = apic_read(APIC_SPIV);
 	value &= ~APIC_VECTOR_MASK;
 	value |= APIC_SPIV_APIC_ENABLED;
-	value |= APIC_SPIV_FOCUS_DISABLED;
+	/* This bit is reserved on P4/Xeon and should be cleared */
+	if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
+	    (boot_cpu_data.x86 == 15))
+		value &= ~APIC_SPIV_FOCUS_DISABLED;
+	else
+		value |= APIC_SPIV_FOCUS_DISABLED;
 	value |= SPURIOUS_APIC_VECTOR;
 	apic_write(APIC_SPIV, value);
 
@@ -798,6 +801,9 @@ void __init init_bsp_APIC(void)
 	 */
 	apic_write(APIC_LVT0, APIC_DM_EXTINT);
 	value = APIC_DM_NMI;
+	/* discrete on 82489DX */
+	if (!lapic_is_integrated())
+		value |= APIC_LVT_LEVEL_TRIGGER;
 	apic_write(APIC_LVT1, value);
 }
 

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