[IA64] pvops: preparation: introduce ia64_set_rr0_to_rr4() to make kernel paravirtualization friendly.

make kernel paravirtualization friendly by introducing
ia64_set_rr0_to_rr4().
ia64/Xen will replace setting rr[0-4] with single hypercall later.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>

include/asm-ia64/intrinsics.h

@@ -18,6 +18,15 @@
 # include <asm/gcc_intrin.h>
 #endif
 
+#define ia64_set_rr0_to_rr4(val0, val1, val2, val3, val4)	\
+do {								\
+	ia64_set_rr(0x0000000000000000UL, (val0));		\
+	ia64_set_rr(0x2000000000000000UL, (val1));		\
+	ia64_set_rr(0x4000000000000000UL, (val2));		\
+	ia64_set_rr(0x6000000000000000UL, (val3));		\
+	ia64_set_rr(0x8000000000000000UL, (val4));		\
+} while (0)
+
 /*
  * Force an unresolved reference if someone tries to use
  * ia64_fetch_and_add() with a bad value.

include/asm-ia64/mmu_context.h

@@ -152,11 +152,7 @@ reload_context (nv_mm_context_t context)
 #  endif
 #endif
 
-	ia64_set_rr(0x0000000000000000UL, rr0);
-	ia64_set_rr(0x2000000000000000UL, rr1);
-	ia64_set_rr(0x4000000000000000UL, rr2);
-	ia64_set_rr(0x6000000000000000UL, rr3);
-	ia64_set_rr(0x8000000000000000UL, rr4);
+	ia64_set_rr0_to_rr4(rr0, rr1, rr2, rr3, rr4);
 	ia64_srlz_i();			/* srlz.i implies srlz.d */
 }