--- /dev/null
+/* 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_ */
config SERIAL_EARLYCON_ARM_SEMIHOST
bool "Early console using ARM semihosting"
- depends on ARM64 || ARM
+ depends on ARM64 || ARM || RISCV
select SERIAL_CORE
select SERIAL_CORE_CONSOLE
select SERIAL_EARLYCON