arch/mips/include/asm/irqflags.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_IRQFLAGS_H
  12 #define _ASM_IRQFLAGS_H
  13
  14 #ifndef __ASSEMBLY__
  15
  16 #include <linux/compiler.h>
  17 #include <linux/stringify.h>
  18 #include <asm/compiler.h>
  19 #include <asm/hazards.h>
  20
  21 #if defined(CONFIG_CPU_HAS_DIEI)
  22
  23 static inline void arch_local_irq_disable(void)
  24 {
  25         __asm__ __volatile__(
  26         "       .set    push                                            \n"
  27         "       .set    noat                                            \n"
  28         "       di                                                      \n"
  29         "       " __stringify(__irq_disable_hazard) "                   \n"
  30         "       .set    pop                                             \n"
  31         : /* no outputs */
  32         : /* no inputs */
  33         : "memory");
  34 }
  35
  36 static inline unsigned long arch_local_irq_save(void)
  37 {
  38         unsigned long flags;
  39
  40         asm __volatile__(
  41         "       .set    push                                            \n"
  42         "       .set    reorder                                         \n"
  43         "       .set    noat                                            \n"
  44 #if defined(CONFIG_CPU_LOONGSON64) || defined(CONFIG_CPU_LOONGSON32)
  45         "       mfc0    %[flags], $12                                   \n"
  46         "       di                                                      \n"
  47 #else
  48         "       di      %[flags]                                        \n"
  49 #endif
  50         "       andi    %[flags], 1                                     \n"
  51         "       " __stringify(__irq_disable_hazard) "                   \n"
  52         "       .set    pop                                             \n"
  53         : [flags] "=r" (flags)
  54         : /* no inputs */
  55         : "memory");
  56
  57         return flags;
  58 }
  59
  60 static inline void arch_local_irq_restore(unsigned long flags)
  61 {
  62         unsigned long __tmp1;
  63
  64         __asm__ __volatile__(
  65         "       .set    push                                            \n"
  66         "       .set    noreorder                                       \n"
  67         "       .set    noat                                            \n"
  68 #if defined(CONFIG_IRQ_MIPS_CPU)
  69         /*
  70          * Slow, but doesn't suffer from a relatively unlikely race
  71          * condition we're having since days 1.
  72          */
  73         "       beqz    %[flags], 1f                                    \n"
  74         "       di                                                      \n"
  75         "       ei                                                      \n"
  76         "1:                                                             \n"
  77 #else
  78         /*
  79          * Fast, dangerous.  Life is fun, life is good.
  80          */
  81         "       mfc0    $1, $12                                         \n"
  82         "       ins     $1, %[flags], 0, 1                              \n"
  83         "       mtc0    $1, $12                                         \n"
  84 #endif
  85         "       " __stringify(__irq_disable_hazard) "                   \n"
  86         "       .set    pop                                             \n"
  87         : [flags] "=r" (__tmp1)
  88         : "0" (flags)
  89         : "memory");
  90 }
  91
  92 #else
  93 /* Functions that require preempt_{dis,en}able() are in mips-atomic.c */
  94 void arch_local_irq_disable(void);
  95 unsigned long arch_local_irq_save(void);
  96 void arch_local_irq_restore(unsigned long flags);
  97 #endif /* CONFIG_CPU_HAS_DIEI */
  98
  99 static inline void arch_local_irq_enable(void)
 100 {
 101         __asm__ __volatile__(
 102         "       .set    push                                            \n"
 103         "       .set    reorder                                         \n"
 104         "       .set    noat                                            \n"
 105 #if defined(CONFIG_CPU_HAS_DIEI)
 106         "       ei                                                      \n"
 107 #else
 108         "       mfc0    $1,$12                                          \n"
 109         "       ori     $1,0x1f                                         \n"
 110         "       xori    $1,0x1e                                         \n"
 111         "       mtc0    $1,$12                                          \n"
 112 #endif
 113         "       " __stringify(__irq_enable_hazard) "                    \n"
 114         "       .set    pop                                             \n"
 115         : /* no outputs */
 116         : /* no inputs */
 117         : "memory");
 118 }
 119
 120 static inline unsigned long arch_local_save_flags(void)
 121 {
 122         unsigned long flags;
 123
 124         asm __volatile__(
 125         "       .set    push                                            \n"
 126         "       .set    reorder                                         \n"
 127         "       mfc0    %[flags], $12                                   \n"
 128         "       .set    pop                                             \n"
 129         : [flags] "=r" (flags));
 130
 131         return flags;
 132 }
 133
 134
 135 static inline int arch_irqs_disabled_flags(unsigned long flags)
 136 {
 137         return !(flags & 1);
 138 }
 139
 140 static inline int arch_irqs_disabled(void)
 141 {
 142         return arch_irqs_disabled_flags(arch_local_save_flags());
 143 }
 144
 145 #endif /* #ifndef __ASSEMBLY__ */
 146
 147 /*
 148  * Do the CPU's IRQ-state tracing from assembly code.
 149  */
 150 #ifdef CONFIG_TRACE_IRQFLAGS
 151 /* Reload some registers clobbered by trace_hardirqs_on */
 152 #ifdef CONFIG_64BIT
 153 # define TRACE_IRQS_RELOAD_REGS                                         \
 154         LONG_L  $11, PT_R11(sp);                                        \
 155         LONG_L  $10, PT_R10(sp);                                        \
 156         LONG_L  $9, PT_R9(sp);                                          \
 157         LONG_L  $8, PT_R8(sp);                                          \
 158         LONG_L  $7, PT_R7(sp);                                          \
 159         LONG_L  $6, PT_R6(sp);                                          \
 160         LONG_L  $5, PT_R5(sp);                                          \
 161         LONG_L  $4, PT_R4(sp);                                          \
 162         LONG_L  $2, PT_R2(sp)
 163 #else
 164 # define TRACE_IRQS_RELOAD_REGS                                         \
 165         LONG_L  $7, PT_R7(sp);                                          \
 166         LONG_L  $6, PT_R6(sp);                                          \
 167         LONG_L  $5, PT_R5(sp);                                          \
 168         LONG_L  $4, PT_R4(sp);                                          \
 169         LONG_L  $2, PT_R2(sp)
 170 #endif
 171 # define TRACE_IRQS_ON                                                  \
 172         CLI;    /* make sure trace_hardirqs_on() is called in kernel level */ \
 173         jal     trace_hardirqs_on
 174 # define TRACE_IRQS_ON_RELOAD                                           \
 175         TRACE_IRQS_ON;                                                  \
 176         TRACE_IRQS_RELOAD_REGS
 177 # define TRACE_IRQS_OFF                                                 \
 178         jal     trace_hardirqs_off
 179 #else
 180 # define TRACE_IRQS_ON
 181 # define TRACE_IRQS_ON_RELOAD
 182 # define TRACE_IRQS_OFF
 183 #endif
 184
 185 #endif /* _ASM_IRQFLAGS_H */