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 
smh_putc(struct uart_port * port,unsigned char c)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