sparc64: Add write_pic() helper.

It writes the %pic register, keeping mind of processor bugs.

Implement reset_pic() in terms of it.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 4 deletions

diff --git a/arch/sparc/include/asm/system_64.h b/arch/sparc/include/asm/system_64.h
index 779cf62d3ce9..6c077816ab28 100644
--- a/arch/sparc/include/asm/system_64.h
+++ b/arch/sparc/include/asm/system_64.h
@@ -96,11 +96,12 @@ do {	__asm__ __volatile__("ba,pt	%%xcc, 1f\n\t" \
  * arch/sparc64/kernel/smp.c:smp_percpu_timer_interrupt()
  * for more information.
  */
-#define reset_pic()                                             \
-        __asm__ __volatile__("ba,pt     %xcc, 99f\n\t"          \
+#define write_pic(__p)                                          \
+        __asm__ __volatile__("ba,pt     %%xcc, 99f\n\t"         \
                              ".align    64\n"                   \
-                          "99:wr        %g0, 0x0, %pic\n\t"     \
-                             "rd        %pic, %g0")
+                          "99:wr        %0, 0x0, %%pic\n\t"     \
+                             "rd        %%pic, %%g0" : : "r" (__p))
+#define reset_pic()     write_pic(0)
 
 #ifndef __ASSEMBLY__