| /* SPDX-License-Identifier: GPL-2.0 */ | |
| /* | |
| * Copyright (C) 2012 ARM Ltd. | |
| * Author: Marc Zyngier <marc.zyngier@arm.com> | |
| * | |
| * Adapted for ARM and earlycon: | |
| * Copyright (C) 2014 Linaro Ltd. | |
| * Author: Rob Herring <robh@kernel.org> | |
| */ | |
| #ifndef _ARM_SEMIHOST_H_ | |
| #define _ARM_SEMIHOST_H_ | |
| #ifdef CONFIG_THUMB2_KERNEL | |
| #define SEMIHOST_SWI "0xab" | |
| #else | |
| #define SEMIHOST_SWI "0x123456" | |
| #endif | |
| struct uart_port; | |
| static inline void smh_putc(struct uart_port *port, unsigned char c) | |
| { | |
| asm volatile("mov r1, %0\n" | |
| "mov r0, #3\n" | |
| "svc " SEMIHOST_SWI "\n" | |
| : : "r" (&c) : "r0", "r1", "memory"); | |
| } | |
| #endif /* _ARM_SEMIHOST_H_ */ |