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
20 struct uart_port;
21
22 static 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
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