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 <asm/hazards.h>
  15
  16 __asm__ (
  17         ".macro\tlocal_irq_enable\n\t"
  18         ".set\tpush\n\t"
  19         ".set\treorder\n\t"
  20         ".set\tnoat\n\t"
  21         "mfc0\t$1,$12\n\t"
  22         "ori\t$1,0x1f\n\t"
  23         "xori\t$1,0x1e\n\t"
  24         "mtc0\t$1,$12\n\t"
  25         "irq_enable_hazard\n\t"
  26         ".set\tpop\n\t"
  27         ".endm");
  28
  29 static inline void local_irq_enable(void)
  30 {
  31         __asm__ __volatile__(
  32                 "local_irq_enable"
  33                 : /* no outputs */
  34                 : /* no inputs */
  35                 : "memory");
  36 }
  37
  38 /*
  39  * For cli() we have to insert nops to make sure that the new value
  40  * has actually arrived in the status register before the end of this
  41  * macro.
  42  * R4000/R4400 need three nops, the R4600 two nops and the R10000 needs
  43  * no nops at all.
  44  */
  45 __asm__ (
  46         ".macro\tlocal_irq_disable\n\t"
  47         ".set\tpush\n\t"
  48         ".set\tnoat\n\t"
  49         "mfc0\t$1,$12\n\t"
  50         "ori\t$1,1\n\t"
  51         "xori\t$1,1\n\t"
  52         ".set\tnoreorder\n\t"
  53         "mtc0\t$1,$12\n\t"
  54         "irq_disable_hazard\n\t"
  55         ".set\tpop\n\t"
  56         ".endm");
  57
  58 static inline void local_irq_disable(void)
  59 {
  60         __asm__ __volatile__(
  61                 "local_irq_disable"
  62                 : /* no outputs */
  63                 : /* no inputs */
  64                 : "memory");
  65 }
  66
  67 __asm__ (
  68         ".macro\tlocal_save_flags flags\n\t"
  69         ".set\tpush\n\t"
  70         ".set\treorder\n\t"
  71         "mfc0\t\\flags, $12\n\t"
  72         ".set\tpop\n\t"
  73         ".endm");
  74
  75 #define local_save_flags(x)                                             \
  76 __asm__ __volatile__(                                                   \
  77         "local_save_flags %0"                                           \
  78         : "=r" (x))
  79
  80 __asm__ (
  81         ".macro\tlocal_irq_save result\n\t"
  82         ".set\tpush\n\t"
  83         ".set\treorder\n\t"
  84         ".set\tnoat\n\t"
  85         "mfc0\t\\result, $12\n\t"
  86         "ori\t$1, \\result, 1\n\t"
  87         "xori\t$1, 1\n\t"
  88         ".set\tnoreorder\n\t"
  89         "mtc0\t$1, $12\n\t"
  90         "irq_disable_hazard\n\t"
  91         ".set\tpop\n\t"
  92         ".endm");
  93
  94 #define local_irq_save(x)                                               \
  95 __asm__ __volatile__(                                                   \
  96         "local_irq_save\t%0"                                            \
  97         : "=r" (x)                                                      \
  98         : /* no inputs */                                               \
  99         : "memory")
 100
 101 __asm__ (
 102         ".macro\tlocal_irq_restore flags\n\t"
 103         ".set\tnoreorder\n\t"
 104         ".set\tnoat\n\t"
 105         "mfc0\t$1, $12\n\t"
 106         "andi\t\\flags, 1\n\t"
 107         "ori\t$1, 1\n\t"
 108         "xori\t$1, 1\n\t"
 109         "or\t\\flags, $1\n\t"
 110         "mtc0\t\\flags, $12\n\t"
 111         "irq_disable_hazard\n\t"
 112         ".set\tat\n\t"
 113         ".set\treorder\n\t"
 114         ".endm");
 115
 116 #define local_irq_restore(flags)                                        \
 117 do {                                                                    \
 118         unsigned long __tmp1;                                           \
 119                                                                         \
 120         __asm__ __volatile__(                                           \
 121                 "local_irq_restore\t%0"                                 \
 122                 : "=r" (__tmp1)                                         \
 123                 : "0" (flags)                                           \
 124                 : "memory");                                            \
 125 } while(0)
 126
 127 #define irqs_disabled()                                                 \
 128 ({                                                                      \
 129         unsigned long flags;                                            \
 130         local_save_flags(flags);                                        \
 131         !(flags & 1);                                                   \
 132 })
 133
 134 #endif /* _ASM_INTERRUPT_H */