arch/powerpc/include/asm/vdso/processor.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 #ifndef _ASM_POWERPC_VDSO_PROCESSOR_H
   3 #define _ASM_POWERPC_VDSO_PROCESSOR_H
   4
   5 #ifndef __ASSEMBLY__
   6
   7 /* Macros for adjusting thread priority (hardware multi-threading) */
   8 #ifdef CONFIG_PPC64
   9 #define HMT_very_low()          asm volatile("or 31, 31, 31     # very low priority")
  10 #define HMT_low()               asm volatile("or 1, 1, 1        # low priority")
  11 #define HMT_medium_low()        asm volatile("or 6, 6, 6        # medium low priority")
  12 #define HMT_medium()            asm volatile("or 2, 2, 2        # medium priority")
  13 #define HMT_medium_high()       asm volatile("or 5, 5, 5        # medium high priority")
  14 #define HMT_high()              asm volatile("or 3, 3, 3        # high priority")
  15 #else
  16 #define HMT_very_low()
  17 #define HMT_low()
  18 #define HMT_medium_low()
  19 #define HMT_medium()
  20 #define HMT_medium_high()
  21 #define HMT_high()
  22 #endif
  23
  24 #ifdef CONFIG_PPC64
  25 #define cpu_relax()                                                     \
  26         asm volatile(ASM_FTR_IFCLR(                                     \
  27                 /* Pre-POWER10 uses low ; medium priority nops */       \
  28                 "or 1,1,1 ; or 2,2,2",                                  \
  29                 /* POWER10 onward uses pause_short (wait 2,0) */        \
  30                 PPC_WAIT(2, 0),                                         \
  31                 %0) :: "i" (CPU_FTR_ARCH_31) : "memory")
  32 #else
  33 #define cpu_relax()     barrier()
  34 #endif
  35
  36 #endif /* __ASSEMBLY__ */
  37
  38 #endif /* _ASM_POWERPC_VDSO_PROCESSOR_H */