| /* 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_ */ |
