x64, x2apic/intr-remap: x2apic ops for x2apic mode support

x2apic ops for x2apic mode support. This uses MSR interface and differs
slightly from the xapic register layout.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: akpm@linux-foundation.org
Cc: arjan@linux.intel.com
Cc: andi@firstfloor.org
Cc: ebiederm@xmission.com
Cc: jbarnes@virtuousgeek.org
Cc: steiner@sgi.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 22 insertions, 0 deletions

diff --git a/include/asm-x86/apic.h b/include/asm-x86/apic.h
index 6fda195337c..bb54928373c 100644
--- a/include/asm-x86/apic.h
+++ b/include/asm-x86/apic.h
@@ -7,6 +7,8 @@
 #include <asm/apicdef.h>
 #include <asm/processor.h>
 #include <asm/system.h>
+#include <asm/cpufeature.h>
+#include <asm/msr.h>
 
 #define ARCH_APICTIMER_STOPS_ON_C3	1
 
@@ -73,6 +75,26 @@ static inline u32 native_apic_mem_read(u32 reg)
 	return *((volatile u32 *)(APIC_BASE + reg));
 }
 
+static inline void native_apic_msr_write(u32 reg, u32 v)
+{
+	if (reg == APIC_DFR || reg == APIC_ID || reg == APIC_LDR ||
+	    reg == APIC_LVR)
+		return;
+
+	wrmsr(APIC_BASE_MSR + (reg >> 4), v, 0);
+}
+
+static inline u32 native_apic_msr_read(u32 reg)
+{
+	u32 low, high;
+
+	if (reg == APIC_DFR)
+		return -1;
+
+	rdmsr(APIC_BASE_MSR + (reg >> 4), low, high);
+	return low;
+}
+
 #ifdef CONFIG_X86_32
 extern void apic_wait_icr_idle(void);
 extern u32 safe_apic_wait_icr_idle(void);