[PATCH] paravirt: Add APIC accessors to paravirt-ops.

Add APIC accessors to paravirt-ops.  Unfortunately, we need two write
functions, as some older broken hardware requires workarounds for
Pentium APIC errata - this is the purpose of apic_write_atomic.

AK: replaced __inline with inline

Signed-off-by: Zachary Amsden <zach@vmware.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>

3 files changed, 47 insertions, 3 deletions

diff --git a/arch/i386/kernel/paravirt.c b/arch/i386/kernel/paravirt.c
index 5a9bd3250a1a..fe82eb3adf42 100644
--- a/arch/i386/kernel/paravirt.c
+++ b/arch/i386/kernel/paravirt.c
@@ -29,6 +29,8 @@
 #include <asm/time.h>
 #include <asm/irq.h>
 #include <asm/delay.h>
+#include <asm/fixmap.h>
+#include <asm/apic.h>
 
 /* nop stub */
 static void native_nop(void)
@@ -446,6 +448,12 @@ struct paravirt_ops paravirt_ops = {
         .io_delay = native_io_delay,
         .const_udelay = __const_udelay,
 
+#ifdef CONFIG_X86_LOCAL_APIC
+        .apic_write = native_apic_write,
+        .apic_write_atomic = native_apic_write_atomic,
+        .apic_read = native_apic_read,
+#endif
+
         .irq_enable_sysexit = native_irq_enable_sysexit,
         .iret = native_iret,
 };
diff --git a/include/asm-i386/apic.h b/include/asm-i386/apic.h
index b9529578fc37..41a44319905f 100644
--- a/include/asm-i386/apic.h
+++ b/include/asm-i386/apic.h
@@ -37,18 +37,27 @@ extern void generic_apic_probe(void);
 /*
  * Basic functions accessing APICs.
  */
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
+#define apic_write native_apic_write
+#define apic_write_atomic native_apic_write_atomic
+#define apic_read native_apic_read
+#endif
 
-static __inline void apic_write(unsigned long reg, unsigned long v)
+static __inline fastcall void native_apic_write(unsigned long reg,
+                                                unsigned long v)
 {
         *((volatile unsigned long *)(APIC_BASE+reg)) = v;
 }
 
-static __inline void apic_write_atomic(unsigned long reg, unsigned long v)
+static __inline fastcall void native_apic_write_atomic(unsigned long reg,
+                                                       unsigned long v)
 {
         xchg((volatile unsigned long *)(APIC_BASE+reg), v);
 }
 
-static __inline unsigned long apic_read(unsigned long reg)
+static __inline fastcall unsigned long native_apic_read(unsigned long reg)
 {
         return *((volatile unsigned long *)(APIC_BASE+reg));
 }
diff --git a/include/asm-i386/paravirt.h b/include/asm-i386/paravirt.h
index dd707d8c8270..e2c803fadb14 100644
--- a/include/asm-i386/paravirt.h
+++ b/include/asm-i386/paravirt.h
@@ -115,6 +115,12 @@ struct paravirt_ops
         void (fastcall *io_delay)(void);
         void (*const_udelay)(unsigned long loops);
 
+#ifdef CONFIG_X86_LOCAL_APIC
+        void (fastcall *apic_write)(unsigned long reg, unsigned long v);
+        void (fastcall *apic_write_atomic)(unsigned long reg, unsigned long v);
+        unsigned long (fastcall *apic_read)(unsigned long reg);
+#endif
+
         /* These two are jmp to, not actually called. */
         void (fastcall *irq_enable_sysexit)(void);
         void (fastcall *iret)(void);
@@ -270,6 +276,27 @@ static inline void slow_down_io(void) {
 #endif
 }
 
+#ifdef CONFIG_X86_LOCAL_APIC
+/*
+ * Basic functions accessing APICs.
+ */
+static inline void apic_write(unsigned long reg, unsigned long v)
+{
+        paravirt_ops.apic_write(reg,v);
+}
+
+static inline void apic_write_atomic(unsigned long reg, unsigned long v)
+{
+        paravirt_ops.apic_write_atomic(reg,v);
+}
+
+static inline unsigned long apic_read(unsigned long reg)
+{
+        return paravirt_ops.apic_read(reg);
+}
+#endif
+
+
 /* These all sit in the .parainstructions section to tell us what to patch. */
 struct paravirt_patch {
         u8 *instr;              /* original instructions */