include/asm/dcc.h

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 /* Copyright (c) 2010, 2014 The Linux Foundation. All rights reserved.
0003  */
0004
0005 #include <asm/barrier.h>
0006
0007 static inline u32 __dcc_getstatus(void)
0008 {
0009     u32 __ret;
0010     asm volatile("mrc p14, 0, %0, c0, c1, 0 @ read comms ctrl reg"
0011         : "=r" (__ret) : : "cc");
0012
0013     return __ret;
0014 }
0015
0016 static inline char __dcc_getchar(void)
0017 {
0018     char __c;
0019
0020     asm volatile("mrc p14, 0, %0, c0, c5, 0 @ read comms data reg"
0021         : "=r" (__c));
0022     isb();
0023
0024     return __c;
0025 }
0026
0027 static inline void __dcc_putchar(char c)
0028 {
0029     asm volatile("mcr p14, 0, %0, c0, c5, 0 @ write a char"
0030         : /* no output register */
0031         : "r" (c));
0032     isb();
0033 }