| /* SPDX-License-Identifier: GPL-2.0 */ | |
| /* | |
| * Copyright (C) 2022 tinylab.org | |
| * Author: Bin Meng <bmeng@tinylab.org> | |
| */ | |
| #ifndef _RISCV_SEMIHOST_H_ | |
| #define _RISCV_SEMIHOST_H_ | |
| struct uart_port; | |
| static inline void smh_putc(struct uart_port *port, unsigned char c) | |
| { | |
| asm volatile("addi a1, %0, 0\n" | |
| "addi a0, zero, 3\n" | |
| ".balign 16\n" | |
| ".option push\n" | |
| ".option norvc\n" | |
| "slli zero, zero, 0x1f\n" | |
| "ebreak\n" | |
| "srai zero, zero, 0x7\n" | |
| ".option pop\n" | |
| : : "r" (&c) : "a0", "a1", "memory"); | |
| } | |
| #endif /* _RISCV_SEMIHOST_H_ */ |