x64, x2apic/intr-remap: IO-APIC support for interrupt-remapping

[~andy/linux] / include / asm-x86 / apic.h

diff --git a/include/asm-x86/apic.h b/include/asm-x86/apic.h
index 6fda195337c53a92303aaa3450eaafa2feba9b64..aa746704a5c9f6778f821514482258fb1a00b57d 100644 (file)
--- 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);
@@ -112,6 +134,15 @@ extern int get_physical_broadcast(void);
 # define apic_write_around(x, y) apic_write_atomic((x), (y))
 #endif
 
+#ifdef CONFIG_X86_64
+static inline void ack_x2APIC_irq(void)
+{
+       /* Docs say use 0 for future compatibility */
+       native_apic_msr_write(APIC_EOI, 0);
+}
+#endif
+
+
 static inline void ack_APIC_irq(void)
 {
        /*