include/asm-mips/interrupt.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) 1994, 95, 96, 97, 98, 99, 2003 by Ralf Baechle
   7  * Copyright (C) 1996 by Paul M. Antoine
   8  * Copyright (C) 1999 Silicon Graphics
   9  * Copyright (C) 2000 MIPS Technologies, Inc.
  10  */
  11 #ifndef _ASM_INTERRUPT_H
  12 #define _ASM_INTERRUPT_H
  13
  14 #include <linux/config.h>
  15 #include <asm/hazards.h>
  16
  17 __asm__ (
  18         "       .macro  local_irq_enable                                \n"
  19         "       .set    push                                            \n"
  20         "       .set    reorder                                         \n"
  21         "       .set    noat                                            \n"
  22 #ifdef CONFIG_CPU_MIPSR2
  23         "       ei                                                      \n"
  24 #else
  25         "       mfc0    $1,$12                                          \n"
  26         "       ori     $1,0x1f                                         \n"
  27         "       xori    $1,0x1e                                         \n"
  28         "       mtc0    $1,$12                                          \n"
  29 #endif
  30         "       irq_enable_hazard                                       \n"
  31         "       .set    pop                                             \n"
  32         "       .endm");
  33
  34 static inline void local_irq_enable(void)
  35 {
  36         __asm__ __volatile__(
  37                 "local_irq_enable"
  38                 : /* no outputs */
  39                 : /* no inputs */
  40                 : "memory");
  41 }
  42
  43 /*
  44  * For cli() we have to insert nops to make sure that the new value
  45  * has actually arrived in the status register before the end of this
  46  * macro.
  47  * R4000/R4400 need three nops, the R4600 two nops and the R10000 needs
  48  * no nops at all.
  49  */
  50 __asm__ (
  51         "       .macro  local_irq_disable\n"
  52         "       .set    push                                            \n"
  53         "       .set    noat                                            \n"
  54 #ifdef CONFIG_CPU_MIPSR2
  55         "       di                                                      \n"
  56 #else
  57         "       mfc0    $1,$12                                          \n"
  58         "       ori     $1,1                                            \n"
  59         "       xori    $1,1                                            \n"
  60         "       .set    noreorder                                       \n"
  61         "       mtc0    $1,$12                                          \n"
  62 #endif
  63         "       irq_disable_hazard                                      \n"
  64         "       .set    pop                                             \n"
  65         "       .endm                                                   \n");
  66
  67 static inline void local_irq_disable(void)
  68 {
  69         __asm__ __volatile__(
  70                 "local_irq_disable"
  71                 : /* no outputs */
  72                 : /* no inputs */
  73                 : "memory");
  74 }
  75
  76 __asm__ (
  77         "       .macro  local_save_flags flags                          \n"
  78         "       .set    push                                            \n"
  79         "       .set    reorder                                         \n"
  80         "       mfc0    \\flags, $12                                    \n"
  81         "       .set    pop                                             \n"
  82         "       .endm                                                   \n");
  83
  84 #define local_save_flags(x)                                             \
  85 __asm__ __volatile__(                                                   \
  86         "local_save_flags %0"                                           \
  87         : "=r" (x))
  88
  89 __asm__ (
  90         "       .macro  local_irq_save result                           \n"
  91         "       .set    push                                            \n"
  92         "       .set    reorder                                         \n"
  93         "       .set    noat                                            \n"
  94 #ifdef CONFIG_CPU_MIPSR2
  95         "       di      \\result                                        \n"
  96 #else
  97         "       mfc0    \\result, $12                                   \n"
  98         "       ori     $1, \\result, 1                                 \n"
  99         "       xori    $1, 1                                           \n"
 100         "       .set    noreorder                                       \n"
 101         "       mtc0    $1, $12                                         \n"
 102 #endif
 103         "       irq_disable_hazard                                      \n"
 104         "       .set    pop                                             \n"
 105         "       .endm                                                   \n");
 106
 107 #define local_irq_save(x)                                               \
 108 __asm__ __volatile__(                                                   \
 109         "local_irq_save\t%0"                                            \
 110         : "=r" (x)                                                      \
 111         : /* no inputs */                                               \
 112         : "memory")
 113
 114 __asm__ (
 115         "       .macro  local_irq_restore flags                         \n"
 116         "       .set    noreorder                                       \n"
 117         "       .set    noat                                            \n"
 118 #if defined(CONFIG_CPU_MIPSR2) && defined(CONFIG_IRQ_CPU)
 119         /*
 120          * Slow, but doesn't suffer from a relativly unlikely race
 121          * condition we're having since days 1.
 122          */
 123         "       beqz    \\flags, 1f                                     \n"
 124         "        di                                                     \n"
 125         "       ei                                                      \n"
 126         "1:                                                             \n"
 127 #elif defined(CONFIG_CPU_MIPSR2)
 128         /*
 129          * Fast, dangerous.  Life is fun, life is good.
 130          */
 131         "       mfc0    $1, $12                                         \n"
 132         "       ins     $1, \\flags, 0, 1                               \n"
 133         "       mtc0    $1, $12                                         \n"
 134 #else
 135         "       mfc0    $1, $12                                         \n"
 136         "       andi    \\flags, 1                                      \n"
 137         "       ori     $1, 1                                           \n"
 138         "       xori    $1, 1                                           \n"
 139         "       or      \\flags, $1                                     \n"
 140         "       mtc0    \\flags, $12                                    \n"
 141 #endif
 142         "       irq_disable_hazard                                      \n"
 143         "       .set    at                                              \n"
 144         "       .set    reorder                                         \n"
 145         "       .endm                                                   \n");
 146
 147 #define local_irq_restore(flags)                                        \
 148 do {                                                                    \
 149         unsigned long __tmp1;                                           \
 150                                                                         \
 151         __asm__ __volatile__(                                           \
 152                 "local_irq_restore\t%0"                                 \
 153                 : "=r" (__tmp1)                                         \
 154                 : "0" (flags)                                           \
 155                 : "memory");                                            \
 156 } while(0)
 157
 158 #define irqs_disabled()                                                 \
 159 ({                                                                      \
 160         unsigned long flags;                                            \
 161         local_save_flags(flags);                                        \
 162         !(flags & 1);                                                   \
 163 })
 164
 165 #endif /* _ASM_INTERRUPT_H */