| /* 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_ */ |
