kernel/arch/powerpc/include/asm/runlatch.h

   1 /*
   2  * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
   3  */
   4 #ifndef _ASM_POWERPC_RUNLATCH_H
   5 #define _ASM_POWERPC_RUNLATCH_H
   6
   7 #ifdef CONFIG_PPC64
   8
   9 extern void __ppc64_runlatch_on(void);
  10 extern void __ppc64_runlatch_off(void);
  11
  12 /*
  13  * We manually hard enable-disable, this is called
  14  * in the idle loop and we don't want to mess up
  15  * with soft-disable/enable & interrupt replay.
  16  */
  17 #define ppc64_runlatch_off()                                    \
  18         do {                                                    \
  19                 if (cpu_has_feature(CPU_FTR_CTRL) &&            \
  20                     test_thread_local_flags(_TLF_RUNLATCH)) {   \
  21                         unsigned long msr = mfmsr();            \
  22                         __hard_irq_disable();                   \
  23                         __ppc64_runlatch_off();                 \
  24                         if (msr & MSR_EE)                       \
  25                                 __hard_irq_enable();            \
  26                 }                                               \
  27         } while (0)
  28
  29 #define ppc64_runlatch_on()                                     \
  30         do {                                                    \
  31                 if (cpu_has_feature(CPU_FTR_CTRL) &&            \
  32                     !test_thread_local_flags(_TLF_RUNLATCH)) {  \
  33                         unsigned long msr = mfmsr();            \
  34                         __hard_irq_disable();                   \
  35                         __ppc64_runlatch_on();                  \
  36                         if (msr & MSR_EE)                       \
  37                                 __hard_irq_enable();            \
  38                 }                                               \
  39         } while (0)
  40 #else
  41 #define ppc64_runlatch_on()
  42 #define ppc64_runlatch_off()
  43 #endif /* CONFIG_PPC64 */
  44
  45 #endif /* _ASM_POWERPC_RUNLATCH_H */