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 <asm/hazards.h>
  18
  19 #if defined(CONFIG_CPU_MIPSR2) && !defined(CONFIG_MIPS_MT_SMTC)
  20
  21 __asm__(
  22         "       .macro  arch_local_irq_disable\n"
  23         "       .set    push                                            \n"
  24         "       .set    noat                                            \n"
  25         "       di                                                      \n"
  26         "       irq_disable_hazard                                      \n"
  27         "       .set    pop                                             \n"
  28         "       .endm                                                   \n");
  29
  30 static inline void arch_local_irq_disable(void)
  31 {
  32         __asm__ __volatile__(
  33                 "arch_local_irq_disable"
  34                 : /* no outputs */
  35                 : /* no inputs */
  36                 : "memory");
  37 }
  38
  39
  40 __asm__(
  41         "       .macro  arch_local_irq_save result                      \n"
  42         "       .set    push                                            \n"
  43         "       .set    reorder                                         \n"
  44         "       .set    noat                                            \n"
  45         "       di      \\result                                        \n"
  46         "       andi    \\result, 1                                     \n"
  47         "       irq_disable_hazard                                      \n"
  48         "       .set    pop                                             \n"
  49         "       .endm                                                   \n");
  50
  51 static inline unsigned long arch_local_irq_save(void)
  52 {
  53         unsigned long flags;
  54         asm volatile("arch_local_irq_save\t%0"
  55                      : "=r" (flags)
  56                      : /* no inputs */
  57                      : "memory");
  58         return flags;
  59 }
  60
  61
  62 __asm__(
  63         "       .macro  arch_local_irq_restore flags                    \n"
  64         "       .set    push                                            \n"
  65         "       .set    noreorder                                       \n"
  66         "       .set    noat                                            \n"
  67 #if defined(CONFIG_IRQ_CPU)
  68         /*
  69          * Slow, but doesn't suffer from a relatively unlikely race
  70          * condition we're having since days 1.
  71          */
  72         "       beqz    \\flags, 1f                                     \n"
  73         "       di                                                      \n"
  74         "       ei                                                      \n"
  75         "1:                                                             \n"
  76 #else
  77         /*
  78          * Fast, dangerous.  Life is fun, life is good.
  79          */
  80         "       mfc0    $1, $12                                         \n"
  81         "       ins     $1, \\flags, 0, 1                               \n"
  82         "       mtc0    $1, $12                                         \n"
  83 #endif
  84         "       irq_disable_hazard                                      \n"
  85         "       .set    pop                                             \n"
  86         "       .endm                                                   \n");
  87
  88 static inline void arch_local_irq_restore(unsigned long flags)
  89 {
  90         unsigned long __tmp1;
  91
  92         __asm__ __volatile__(
  93                 "arch_local_irq_restore\t%0"
  94                 : "=r" (__tmp1)
  95                 : "0" (flags)
  96                 : "memory");
  97 }
  98
  99 static inline void __arch_local_irq_restore(unsigned long flags)
 100 {
 101         unsigned long __tmp1;
 102
 103         __asm__ __volatile__(
 104                 "arch_local_irq_restore\t%0"
 105                 : "=r" (__tmp1)
 106                 : "0" (flags)
 107                 : "memory");
 108 }
 109 #else
 110 /* Functions that require preempt_{dis,en}able() are in mips-atomic.c */
 111 void arch_local_irq_disable(void);
 112 unsigned long arch_local_irq_save(void);
 113 void arch_local_irq_restore(unsigned long flags);
 114 void __arch_local_irq_restore(unsigned long flags);
 115 #endif /* if defined(CONFIG_CPU_MIPSR2) && !defined(CONFIG_MIPS_MT_SMTC) */
 116
 117
 118 __asm__(
 119         "       .macro  arch_local_irq_enable                           \n"
 120         "       .set    push                                            \n"
 121         "       .set    reorder                                         \n"
 122         "       .set    noat                                            \n"
 123 #ifdef CONFIG_MIPS_MT_SMTC
 124         "       mfc0    $1, $2, 1       # SMTC - clear TCStatus.IXMT    \n"
 125         "       ori     $1, 0x400                                       \n"
 126         "       xori    $1, 0x400                                       \n"
 127         "       mtc0    $1, $2, 1                                       \n"
 128 #elif defined(CONFIG_CPU_MIPSR2)
 129         "       ei                                                      \n"
 130 #else
 131         "       mfc0    $1,$12                                          \n"
 132         "       ori     $1,0x1f                                         \n"
 133         "       xori    $1,0x1e                                         \n"
 134         "       mtc0    $1,$12                                          \n"
 135 #endif
 136         "       irq_enable_hazard                                       \n"
 137         "       .set    pop                                             \n"
 138         "       .endm");
 139
 140 extern void smtc_ipi_replay(void);
 141
 142 static inline void arch_local_irq_enable(void)
 143 {
 144 #ifdef CONFIG_MIPS_MT_SMTC
 145         /*
 146          * SMTC kernel needs to do a software replay of queued
 147          * IPIs, at the cost of call overhead on each local_irq_enable()
 148          */
 149         smtc_ipi_replay();
 150 #endif
 151         __asm__ __volatile__(
 152                 "arch_local_irq_enable"
 153                 : /* no outputs */
 154                 : /* no inputs */
 155                 : "memory");
 156 }
 157
 158
 159 __asm__(
 160         "       .macro  arch_local_save_flags flags                     \n"
 161         "       .set    push                                            \n"
 162         "       .set    reorder                                         \n"
 163 #ifdef CONFIG_MIPS_MT_SMTC
 164         "       mfc0    \\flags, $2, 1                                  \n"
 165 #else
 166         "       mfc0    \\flags, $12                                    \n"
 167 #endif
 168         "       .set    pop                                             \n"
 169         "       .endm                                                   \n");
 170
 171 static inline unsigned long arch_local_save_flags(void)
 172 {
 173         unsigned long flags;
 174         asm volatile("arch_local_save_flags %0" : "=r" (flags));
 175         return flags;
 176 }
 177
 178
 179 static inline int arch_irqs_disabled_flags(unsigned long flags)
 180 {
 181 #ifdef CONFIG_MIPS_MT_SMTC
 182         /*
 183          * SMTC model uses TCStatus.IXMT to disable interrupts for a thread/CPU
 184          */
 185         return flags & 0x400;
 186 #else
 187         return !(flags & 1);
 188 #endif
 189 }
 190
 191 #endif /* #ifndef __ASSEMBLY__ */
 192
 193 /*
 194  * Do the CPU's IRQ-state tracing from assembly code.
 195  */
 196 #ifdef CONFIG_TRACE_IRQFLAGS
 197 /* Reload some registers clobbered by trace_hardirqs_on */
 198 #ifdef CONFIG_64BIT
 199 # define TRACE_IRQS_RELOAD_REGS                                         \
 200         LONG_L  $11, PT_R11(sp);                                        \
 201         LONG_L  $10, PT_R10(sp);                                        \
 202         LONG_L  $9, PT_R9(sp);                                          \
 203         LONG_L  $8, PT_R8(sp);                                          \
 204         LONG_L  $7, PT_R7(sp);                                          \
 205         LONG_L  $6, PT_R6(sp);                                          \
 206         LONG_L  $5, PT_R5(sp);                                          \
 207         LONG_L  $4, PT_R4(sp);                                          \
 208         LONG_L  $2, PT_R2(sp)
 209 #else
 210 # define TRACE_IRQS_RELOAD_REGS                                         \
 211         LONG_L  $7, PT_R7(sp);                                          \
 212         LONG_L  $6, PT_R6(sp);                                          \
 213         LONG_L  $5, PT_R5(sp);                                          \
 214         LONG_L  $4, PT_R4(sp);                                          \
 215         LONG_L  $2, PT_R2(sp)
 216 #endif
 217 # define TRACE_IRQS_ON                                                  \
 218         CLI;    /* make sure trace_hardirqs_on() is called in kernel level */ \
 219         jal     trace_hardirqs_on
 220 # define TRACE_IRQS_ON_RELOAD                                           \
 221         TRACE_IRQS_ON;                                                  \
 222         TRACE_IRQS_RELOAD_REGS
 223 # define TRACE_IRQS_OFF                                                 \
 224         jal     trace_hardirqs_off
 225 #else
 226 # define TRACE_IRQS_ON
 227 # define TRACE_IRQS_ON_RELOAD
 228 # define TRACE_IRQS_OFF
 229 #endif
 230
 231 #endif /* _ASM_IRQFLAGS_H */