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/* 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
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