Index: kernel/arch/sparc64/include/arch/asm.h
===================================================================
--- kernel/arch/sparc64/include/arch/asm.h	(revision 65f3117b0c526538a5c5e972042a0bf4f1a325e1)
+++ kernel/arch/sparc64/include/arch/asm.h	(revision e1f5fb191dfe5766d747cfd1c7466d29ff2d3e95)
@@ -539,4 +539,16 @@
 extern void switch_to_userspace(uint64_t pc, uint64_t sp, uint64_t uarg);
 
+/** Enables interrupts and blocks until an interrupt arrives,
+ * atomically if possible on target architecture.
+ * Disables interrupts again before returning to caller.
+ */
+_NO_TRACE static inline void cpu_interruptible_sleep(void)
+{
+	// FIXME: do this atomically
+	interrupts_enable();
+	cpu_sleep();
+	interrupts_disable();
+}
+
 #endif