Current File : //usr/src/linux-headers-5.15.0-125-generic/arch/riscv/include/asm/clint.h
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2020 Google, Inc
*/
#ifndef _ASM_RISCV_CLINT_H
#define _ASM_RISCV_CLINT_H
#include <linux/types.h>
#include <asm/mmio.h>
#ifdef CONFIG_RISCV_M_MODE
/*
* This lives in the CLINT driver, but is accessed directly by timex.h to avoid
* any overhead when accessing the MMIO timer.
*
* The ISA defines mtime as a 64-bit memory-mapped register that increments at
* a constant frequency, but it doesn't define some other constraints we depend
* on (most notably ordering constraints, but also some simpler stuff like the
* memory layout). Thus, this is called "clint_time_val" instead of something
* like "riscv_mtime", to signify that these non-ISA assumptions must hold.
*/
extern u64 __iomem *clint_time_val;
#endif
#endif
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