From 68b10e9feb49765a654ef4f21d9c6aa858b5a8e4 Mon Sep 17 00:00:00 2001
From: jsg <jsg@openbsd.org>
Date: Wed, 5 May 2021 13:28:56 +0000
Subject: [PATCH] use fence iorw,iorw for bus_space_barrier()

ok kettenis@
---
 sys/arch/riscv64/include/bus.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sys/arch/riscv64/include/bus.h b/sys/arch/riscv64/include/bus.h
index 547cba26404..1087af00918 100644
--- a/sys/arch/riscv64/include/bus.h
+++ b/sys/arch/riscv64/include/bus.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: bus.h,v 1.2 2021/04/24 21:37:41 kettenis Exp $ */
+/* $OpenBSD: bus.h,v 1.3 2021/05/05 13:28:56 jsg Exp $ */
 /*
  * Copyright (c) 2003-2004 Opsycon AB Sweden.  All rights reserved.
  *
@@ -315,7 +315,7 @@ static inline void
 bus_space_barrier(bus_space_tag_t t, bus_space_handle_t h, bus_size_t offset,
     bus_size_t length, int flags)
 {
-	__asm__ volatile ("sfence.vma" ::: "memory");//XXX What?? CMPE
+	__asm__ volatile ("fence iorw,iorw" ::: "memory");
 }
 #define BUS_SPACE_BARRIER_READ  0x01		/* force read barrier */
 #define BUS_SPACE_BARRIER_WRITE 0x02		/* force write barrier */
-- 
2.20.1