[PATCH v2 05/39] xen/riscv: introduce spinlock.h

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
Changes in V2:
 - update definition of arch_lock_signal() to not violate cod style.
 - update definition of arch_lock_signal_wmb() to use WMB aspect.
---
 xen/arch/riscv/include/asm/spinlock.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 xen/arch/riscv/include/asm/spinlock.h

diff --git a/xen/arch/riscv/include/asm/spinlock.h 
b/xen/arch/riscv/include/asm/spinlock.h
new file mode 100644
index 0000000000..bf45a7f005
--- /dev/null
+++ b/xen/arch/riscv/include/asm/spinlock.h
@@ -0,0 +1,15 @@
+#ifndef __ASM_RISCV_SPINLOCK_H
+#define __ASM_RISCV_SPINLOCK_H
+
+#define arch_lock_acquire_barrier() smp_mb()
+#define arch_lock_release_barrier() smp_mb()
+
+#define arch_lock_relax() cpu_relax()
+#define arch_lock_signal() ((void)0)
+#define arch_lock_signal_wmb()      \
+({                                  \
+    smp_wmb();                      \
+    arch_lock_signal();             \
+})
+
+#endif /* __ASM_RISCV_SPINLOCK_H */
-- 
2.42.0