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
   7 static 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
  16 static 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
  27 static 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 }