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 _ARM64_SEMIHOST_H_ 12#define _ARM64_SEMIHOST_H_ 13 14struct uart_port; 15 16static inline void smh_putc(struct uart_port *port, unsigned char c) 17{ 18 asm volatile("mov x1, %0\n" 19 "mov x0, #3\n" 20 "hlt 0xf000\n" 21 : : "r" (&c) : "x0", "x1", "memory"); 22} 23 24#endif /* _ARM64_SEMIHOST_H_ */ 25