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>
diff --git a/include/asm-x86/apic.h b/include/asm-x86/apic.h
index 6fda195..bb54928 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 @@
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);