[SPARC64]: Add sun4v_cpu_yield().

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

2 files changed, 12 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/entry.S b/arch/sparc64/kernel/entry.S
index bd332e41532f..9f3048e64e84 100644
--- a/arch/sparc64/kernel/entry.S
+++ b/arch/sparc64/kernel/entry.S
@@ -1786,3 +1786,12 @@ sun4v_cpu_qconf:
         ta      HV_FAST_TRAP
         retl
          nop
+
+        /* returns %o0: status
+         */
+        .globl  sun4v_cpu_yield
+sun4v_cpu_yield:
+        mov     HV_FAST_CPU_YIELD, %o5
+        ta      HV_FAST_TRAP
+        retl
+         nop
diff --git a/include/asm-sparc64/hypervisor.h b/include/asm-sparc64/hypervisor.h
index cd5fbcd9556e..726e2ea03ce3 100644
--- a/include/asm-sparc64/hypervisor.h
+++ b/include/asm-sparc64/hypervisor.h
@@ -258,6 +258,9 @@
  */
 #define HV_FAST_CPU_YIELD               0x12
 
+#ifndef __ASSEMBLY__
+extern unsigned long sun4v_cpu_yield(void);
+#endif
 
 /* cpu_qconf()
  * TRAP:        HV_FAST_TRAP