arch/mips/include/asm/llsc.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Macros for 32/64-bit neutral inline assembler
   7  */
   8
   9 #ifndef __ASM_LLSC_H
  10 #define __ASM_LLSC_H
  11
  12 #include <asm/isa-rev.h>
  13
  14 #if _MIPS_SZLONG == 32
  15 #define __LL            "ll     "
  16 #define __SC            "sc     "
  17 #define __INS           "ins    "
  18 #define __EXT           "ext    "
  19 #elif _MIPS_SZLONG == 64
  20 #define __LL            "lld    "
  21 #define __SC            "scd    "
  22 #define __INS           "dins   "
  23 #define __EXT           "dext   "
  24 #endif
  25
  26 /*
  27  * Using a branch-likely instruction to check the result of an sc instruction
  28  * works around a bug present in R10000 CPUs prior to revision 3.0 that could
  29  * cause ll-sc sequences to execute non-atomically.
  30  */
  31 #if R10000_LLSC_WAR
  32 # define __SC_BEQZ "beqzl       "
  33 #elif MIPS_ISA_REV >= 6
  34 # define __SC_BEQZ "beqzc       "
  35 #else
  36 # define __SC_BEQZ "beqz        "
  37 #endif
  38
  39 #endif /* __ASM_LLSC_H  */