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 14 struct uart_port; 15 16 static 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