[ipc] support of lockless rt_completion (#8887)

* [ipc] lockless rt_completion implementation

The new rt_completion implemented by lockless algorithm can improve timer resolution for up to ~12%, compare to sem IPC.

Signed-off-by: Shell <[email protected]>

* fixup: error

* remove useless changes

---------

Signed-off-by: Shell <[email protected]>

1 files changed, 17 insertions, 0 deletions

diff --git a/libcpu/risc-v/rv64/cpuport.c b/libcpu/risc-v/rv64/cpuport.c
new file mode 100644
index 0000000000..cb222821b9
--- /dev/null
+++ b/libcpu/risc-v/rv64/cpuport.c
@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-04-26     Shell        lockless rt_completion
+ */
+
+#include <rtthread.h>
+
+#undef rt_hw_isb
+rt_weak void rt_hw_isb(void)
+{
+    return ;
+}