1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (C) 2022 tinylab.org
4 * Author: Bin Meng <bmeng@tinylab.org>
5 */
6
7 #ifndef _RISCV_SEMIHOST_H_
8 #define _RISCV_SEMIHOST_H_
9
10 struct uart_port;
11
12 static inline void smh_putc(struct uart_port *port, unsigned char c)
13 {
14 asm volatile("addi a1, %0, 0\n"
15 "addi a0, zero, 3\n"
16 ".balign 16\n"
17 ".option push\n"
18 ".option norvc\n"
19 "slli zero, zero, 0x1f\n"
20 "ebreak\n"
21 "srai zero, zero, 0x7\n"
22 ".option pop\n"
23 : : "r" (&c) : "a0", "a1", "memory");
24 }
25
26 #endif /* _RISCV_SEMIHOST_H_ */
27
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