include/asm-ppc64/memory.h

   1 #ifndef _ASM_PPC64_MEMORY_H_
   2 #define _ASM_PPC64_MEMORY_H_
   3
   4 /*
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version
   8  * 2 of the License, or (at your option) any later version.
   9  */
  10
  11 #include <linux/config.h>
  12
  13 /*
  14  * Arguably the bitops and *xchg operations don't imply any memory barrier
  15  * or SMP ordering, but in fact a lot of drivers expect them to imply
  16  * both, since they do on x86 cpus.
  17  */
  18 #ifdef CONFIG_SMP
  19 #define EIEIO_ON_SMP    "eieio\n"
  20 #define ISYNC_ON_SMP    "\n\tisync"
  21 #define SYNC_ON_SMP     "lwsync\n\t"
  22 #else
  23 #define EIEIO_ON_SMP
  24 #define ISYNC_ON_SMP
  25 #define SYNC_ON_SMP
  26 #endif
  27
  28 static inline void eieio(void)
  29 {
  30         __asm__ __volatile__ ("eieio" : : : "memory");
  31 }
  32
  33 static inline void isync(void)
  34 {
  35         __asm__ __volatile__ ("isync" : : : "memory");
  36 }
  37
  38 #ifdef CONFIG_SMP
  39 #define eieio_on_smp()  eieio()
  40 #define isync_on_smp()  isync()
  41 #else
  42 #define eieio_on_smp()  __asm__ __volatile__("": : :"memory")
  43 #define isync_on_smp()  __asm__ __volatile__("": : :"memory")
  44 #endif
  45
  46 /* Macros for adjusting thread priority (hardware multi-threading) */
  47 #define HMT_very_low()    asm volatile("or 31,31,31   # very low priority")
  48 #define HMT_low()       asm volatile("or 1,1,1          # low priority")
  49 #define HMT_medium_low()  asm volatile("or 6,6,6      # medium low priority")
  50 #define HMT_medium()    asm volatile("or 2,2,2          # medium priority")
  51 #define HMT_medium_high() asm volatile("or 5,5,5      # medium high priority")
  52 #define HMT_high()      asm volatile("or 3,3,3          # high priority")
  53
  54 #define HMT_VERY_LOW    "\tor   31,31,31        # very low priority\n"
  55 #define HMT_LOW         "\tor   1,1,1           # low priority\n"
  56 #define HMT_MEDIUM_LOW  "\tor   6,6,6           # medium low priority\n"
  57 #define HMT_MEDIUM      "\tor   2,2,2           # medium priority\n"
  58 #define HMT_MEDIUM_HIGH "\tor   5,5,5           # medium high priority\n"
  59 #define HMT_HIGH        "\tor   3,3,3           # high priority\n"
  60
  61 #endif