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Subject[patch 1/2] x86: apic - unify init_bsp_APIC
- remove redundant read of APIC_LVR register in 64bit mode
- APIC is always integrated for 64bit mode so
gcc will eliminate lapic_is_integrated call

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
---

Index: linux-2.6.git/arch/x86/kernel/apic_32.c
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/apic_32.c 2008-08-15 22:14:45.000000000 +0400
+++ linux-2.6.git/arch/x86/kernel/apic_32.c 2008-08-15 22:41:52.000000000 +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
@@ -948,11 +948,13 @@ void __init init_bsp_APIC(void)
value &= ~APIC_VECTOR_MASK;
value |= APIC_SPIV_APIC_ENABLED;

+#ifdef CONFIG_X86_32
/* 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
+#endif
value |= APIC_SPIV_FOCUS_DISABLED;
value |= SPURIOUS_APIC_VECTOR;
apic_write(APIC_SPIV, value);
Index: linux-2.6.git/arch/x86/kernel/apic_64.c
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/apic_64.c 2008-08-15 22:14:45.000000000 +0400
+++ linux-2.6.git/arch/x86/kernel/apic_64.c 2008-08-15 22:41:53.000000000 +0400
@@ -780,8 +780,6 @@ 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.
*/
@@ -793,7 +791,15 @@ 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;
+
+#ifdef CONFIG_X86_32
+ /* 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
+#endif
+ value |= APIC_SPIV_FOCUS_DISABLED;
value |= SPURIOUS_APIC_VECTOR;
apic_write(APIC_SPIV, value);

@@ -802,6 +808,8 @@ void __init init_bsp_APIC(void)
*/
apic_write(APIC_LVT0, APIC_DM_EXTINT);
value = APIC_DM_NMI;
+ if (!lapic_is_integrated()) /* 82489DX */
+ value |= APIC_LVT_LEVEL_TRIGGER;
apic_write(APIC_LVT1, value);
}

--


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