1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2012 ARM Ltd.
4 * Author: Marc Zyngier <marc.zyngier@arm.com>
5 *
6 * Adapted for ARM and earlycon:
7 * Copyright (C) 2014 Linaro Ltd.
8 * Author: Rob Herring <robh@kernel.org>
9 */
10
11#ifndef _ARM_SEMIHOST_H_
12#define _ARM_SEMIHOST_H_
13
14#ifdef CONFIG_THUMB2_KERNEL
15#define SEMIHOST_SWI	"0xab"
16#else
17#define SEMIHOST_SWI	"0x123456"
18#endif
19
20struct uart_port;
21
22static inline void smh_putc(struct uart_port *port, unsigned char c)
23{
24	asm volatile("mov  r1, %0\n"
25		     "mov  r0, #3\n"
26		     "svc  " SEMIHOST_SWI "\n"
27		     : : "r" (&c) : "r0", "r1", "memory");
28}
29
30#endif /* _ARM_SEMIHOST_H_ */
31