1 files changed, 22 insertions, 0 deletions
diff --git a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_FreedomStudio/freedom-metal/metal/io.h b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_FreedomStudio/freedom-metal/metal/io.h
new file mode 100644
index 000000000..450054142
--- /dev/null
+++ b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_FreedomStudio/freedom-metal/metal/io.h
@@ -0,0 +1,22 @@
+/* Copyright 2018 SiFive, Inc */
+/* SPDX-License-Identifier: Apache-2.0 */
+
+#ifndef METAL__IO_H
+#define METAL__IO_H
+
+/* This macro enforces that the compiler will not elide the given access. */
+#define __METAL_ACCESS_ONCE(x) (*(typeof(*x) volatile *)(x))
+
+/* Allows users to specify arbitrary fences. */
+#define __METAL_IO_FENCE(pred, succ) __asm__ volatile ("fence " #pred "," #succ ::: "memory");
+
+/* Types that explicitly describe an address as being used for memory-mapped
+ * IO.  These should only be accessed via __METAL_ACCESS_ONCE. */
+typedef unsigned char  __metal_io_u8;
+typedef unsigned short __metal_io_u16;
+typedef unsigned int   __metal_io_u32;
+#if __riscv_xlen >= 64
+typedef unsigned long  __metal_io_u64;
+#endif
+
+#endif