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