LXR linux-old/include/asm-mips/hazards.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 * Copyright (C) 2003 Ralf Baechle
   7 */
   8#ifndef _ASM_HAZARDS_H
   9#define _ASM_HAZARDS_H
  10
  11#include <linux/config.h>
  12
  13#ifdef __ASSEMBLY__
  14
  15/*
  16 * RM9000 hazards.  When the JTLB is updated by tlbwi or tlbwr, a subsequent
  17 * use of the JTLB for instructions should not occur for 4 cpu cycles and use
  18 * for data translations should not occur for 3 cpu cycles.
  19 */
  20#ifdef CONFIG_CPU_RM9000
  21#define rm9000_tlb_hazard                                               \
  22        .set    push;                                                   \
  23        .set    mips32;                                                 \
  24        ssnop; ssnop; ssnop; ssnop;                                     \
  25        .set    pop
  26#else
  27#define rm9000_tlb_hazard
  28#endif
  29
  30#else
  31
  32/*
  33 * RM9000 hazards.  When the JTLB is updated by tlbwi or tlbwr, a subsequent
  34 * use of the JTLB for instructions should not occur for 4 cpu cycles and use
  35 * for data translations should not occur for 3 cpu cycles.
  36 */
  37#ifdef CONFIG_CPU_RM9000
  38#define rm9000_tlb_hazard()                                             \
  39        __asm__ __volatile__(                                           \
  40                ".set\tmips32\n\t"                                      \
  41                "ssnop; ssnop; ssnop; ssnop\n\t"                        \
  42                ".set\tmips0")
  43#else
  44#define rm9000_tlb_hazard() do { } while (0)
  45#endif
  46
  47#endif
  48
  49#endif /* _ASM_HAZARDS_H */
  50