27 lines
797 B
C
27 lines
797 B
C
|
/* 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
|