42 lines
1.7 KiB
C
42 lines
1.7 KiB
C
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/*
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* Copyright (c) 2006-2018, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2018-10-03 Bernard The first version
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*/
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#ifndef RISCV_OPS_H__
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#define RISCV_OPS_H__
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#if defined(__GNUC__) && !defined(__ASSEMBLER__)
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#define read_csr(reg) ({ unsigned long __tmp; \
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asm volatile ("csrr %0, " #reg : "=r"(__tmp)); \
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__tmp; })
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#define write_csr(reg, val) ({ \
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if (__builtin_constant_p(val) && (unsigned long)(val) < 32) \
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asm volatile ("csrw " #reg ", %0" :: "i"(val)); \
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else \
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asm volatile ("csrw " #reg ", %0" :: "r"(val)); })
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#define set_csr(reg, bit) ({ unsigned long __tmp; \
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if (__builtin_constant_p(bit) && (unsigned long)(bit) < 32) \
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asm volatile ("csrrs %0, " #reg ", %1" : "=r"(__tmp) : "i"(bit)); \
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else \
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asm volatile ("csrrs %0, " #reg ", %1" : "=r"(__tmp) : "r"(bit)); \
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__tmp; })
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#define clear_csr(reg, bit) ({ unsigned long __tmp; \
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if (__builtin_constant_p(bit) && (unsigned long)(bit) < 32) \
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asm volatile ("csrrc %0, " #reg ", %1" : "=r"(__tmp) : "i"(bit)); \
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else \
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asm volatile ("csrrc %0, " #reg ", %1" : "=r"(__tmp) : "r"(bit)); \
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__tmp; })
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#endif /* end of __GNUC__ */
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#endif
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