LXR linux/arch/arm/include/asm/dcc.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/* Copyright (c) 2010, 2014 The Linux Foundation. All rights reserved.
   3 */
   4
   5#include <asm/barrier.h>
   6
   7static inline u32 __dcc_getstatus(void)
   8{
   9        u32 __ret;
  10        asm volatile("mrc p14, 0, %0, c0, c1, 0 @ read comms ctrl reg"
  11                : "=r" (__ret) : : "cc");
  12
  13        return __ret;
  14}
  15
  16static inline char __dcc_getchar(void)
  17{
  18        char __c;
  19
  20        asm volatile("mrc p14, 0, %0, c0, c5, 0 @ read comms data reg"
  21                : "=r" (__c));
  22        isb();
  23
  24        return __c;
  25}
  26
  27static inline void __dcc_putchar(char c)
  28{
  29        asm volatile("mcr p14, 0, %0, c0, c5, 0 @ write a char"
  30                : /* no output register */
  31                : "r" (c));
  32        isb();
  33}
  34