include/asm-mips/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 __asm__(
  20         "       .macro  raw_local_irq_enable                            \n"
  21         "       .set    push                                            \n"
  22         "       .set    reorder                                         \n"
  23         "       .set    noat                                            \n"
  24 #ifdef CONFIG_MIPS_MT_SMTC
  25         "       mfc0    $1, $2, 1       # SMTC - clear TCStatus.IXMT    \n"
  26         "       ori     $1, 0x400                                       \n"
  27         "       xori    $1, 0x400                                       \n"
  28         "       mtc0    $1, $2, 1                                       \n"
  29 #elif defined(CONFIG_CPU_MIPSR2)
  30         "       ei                                                      \n"
  31 #else
  32         "       mfc0    $1,$12                                          \n"
  33         "       ori     $1,0x1f                                         \n"
  34         "       xori    $1,0x1e                                         \n"
  35         "       mtc0    $1,$12                                          \n"
  36 #endif
  37         "       irq_enable_hazard                                       \n"
  38         "       .set    pop                                             \n"
  39         "       .endm");
  40
  41 static inline void raw_local_irq_enable(void)
  42 {
  43         __asm__ __volatile__(
  44                 "raw_local_irq_enable"
  45                 : /* no outputs */
  46                 : /* no inputs */
  47                 : "memory");
  48 }
  49
  50 /*
  51  * For cli() we have to insert nops to make sure that the new value
  52  * has actually arrived in the status register before the end of this
  53  * macro.
  54  * R4000/R4400 need three nops, the R4600 two nops and the R10000 needs
  55  * no nops at all.
  56  */
  57 /*
  58  * For TX49, operating only IE bit is not enough.
  59  *
  60  * If mfc0 $12 follows store and the mfc0 is last instruction of a
  61  * page and fetching the next instruction causes TLB miss, the result
  62  * of the mfc0 might wrongly contain EXL bit.
  63  *
  64  * ERT-TX49H2-027, ERT-TX49H3-012, ERT-TX49HL3-006, ERT-TX49H4-008
  65  *
  66  * Workaround: mask EXL bit of the result or place a nop before mfc0.
  67  */
  68 __asm__(
  69         "       .macro  raw_local_irq_disable\n"
  70         "       .set    push                                            \n"
  71         "       .set    noat                                            \n"
  72 #ifdef CONFIG_MIPS_MT_SMTC
  73         "       mfc0    $1, $2, 1                                       \n"
  74         "       ori     $1, 0x400                                       \n"
  75         "       .set    noreorder                                       \n"
  76         "       mtc0    $1, $2, 1                                       \n"
  77 #elif defined(CONFIG_CPU_MIPSR2)
  78         "       di                                                      \n"
  79 #else
  80         "       mfc0    $1,$12                                          \n"
  81         "       ori     $1,0x1f                                         \n"
  82         "       xori    $1,0x1f                                         \n"
  83         "       .set    noreorder                                       \n"
  84         "       mtc0    $1,$12                                          \n"
  85 #endif
  86         "       irq_disable_hazard                                      \n"
  87         "       .set    pop                                             \n"
  88         "       .endm                                                   \n");
  89
  90 static inline void raw_local_irq_disable(void)
  91 {
  92         __asm__ __volatile__(
  93                 "raw_local_irq_disable"
  94                 : /* no outputs */
  95                 : /* no inputs */
  96                 : "memory");
  97 }
  98
  99 __asm__(
 100         "       .macro  raw_local_save_flags flags                      \n"
 101         "       .set    push                                            \n"
 102         "       .set    reorder                                         \n"
 103 #ifdef CONFIG_MIPS_MT_SMTC
 104         "       mfc0    \\flags, $2, 1                                  \n"
 105 #else
 106         "       mfc0    \\flags, $12                                    \n"
 107 #endif
 108         "       .set    pop                                             \n"
 109         "       .endm                                                   \n");
 110
 111 #define raw_local_save_flags(x)                                         \
 112 __asm__ __volatile__(                                                   \
 113         "raw_local_save_flags %0"                                       \
 114         : "=r" (x))
 115
 116 __asm__(
 117         "       .macro  raw_local_irq_save result                       \n"
 118         "       .set    push                                            \n"
 119         "       .set    reorder                                         \n"
 120         "       .set    noat                                            \n"
 121 #ifdef CONFIG_MIPS_MT_SMTC
 122         "       mfc0    \\result, $2, 1                                 \n"
 123         "       ori     $1, \\result, 0x400                             \n"
 124         "       .set    noreorder                                       \n"
 125         "       mtc0    $1, $2, 1                                       \n"
 126         "       andi    \\result, \\result, 0x400                       \n"
 127 #elif defined(CONFIG_CPU_MIPSR2)
 128         "       di      \\result                                        \n"
 129         "       andi    \\result, 1                                     \n"
 130 #else
 131         "       mfc0    \\result, $12                                   \n"
 132         "       ori     $1, \\result, 0x1f                              \n"
 133         "       xori    $1, 0x1f                                        \n"
 134         "       .set    noreorder                                       \n"
 135         "       mtc0    $1, $12                                         \n"
 136 #endif
 137         "       irq_disable_hazard                                      \n"
 138         "       .set    pop                                             \n"
 139         "       .endm                                                   \n");
 140
 141 #define raw_local_irq_save(x)                                           \
 142 __asm__ __volatile__(                                                   \
 143         "raw_local_irq_save\t%0"                                        \
 144         : "=r" (x)                                                      \
 145         : /* no inputs */                                               \
 146         : "memory")
 147
 148 __asm__(
 149         "       .macro  raw_local_irq_restore flags                     \n"
 150         "       .set    push                                            \n"
 151         "       .set    noreorder                                       \n"
 152         "       .set    noat                                            \n"
 153 #ifdef CONFIG_MIPS_MT_SMTC
 154         "mfc0   $1, $2, 1                                               \n"
 155         "andi   \\flags, 0x400                                          \n"
 156         "ori    $1, 0x400                                               \n"
 157         "xori   $1, 0x400                                               \n"
 158         "or     \\flags, $1                                             \n"
 159         "mtc0   \\flags, $2, 1                                          \n"
 160 #elif defined(CONFIG_CPU_MIPSR2) && defined(CONFIG_IRQ_CPU)
 161         /*
 162          * Slow, but doesn't suffer from a relativly unlikely race
 163          * condition we're having since days 1.
 164          */
 165         "       beqz    \\flags, 1f                                     \n"
 166         "        di                                                     \n"
 167         "       ei                                                      \n"
 168         "1:                                                             \n"
 169 #elif defined(CONFIG_CPU_MIPSR2)
 170         /*
 171          * Fast, dangerous.  Life is fun, life is good.
 172          */
 173         "       mfc0    $1, $12                                         \n"
 174         "       ins     $1, \\flags, 0, 1                               \n"
 175         "       mtc0    $1, $12                                         \n"
 176 #else
 177         "       mfc0    $1, $12                                         \n"
 178         "       andi    \\flags, 1                                      \n"
 179         "       ori     $1, 0x1f                                        \n"
 180         "       xori    $1, 0x1f                                        \n"
 181         "       or      \\flags, $1                                     \n"
 182         "       mtc0    \\flags, $12                                    \n"
 183 #endif
 184         "       irq_disable_hazard                                      \n"
 185         "       .set    pop                                             \n"
 186         "       .endm                                                   \n");
 187
 188 extern void smtc_ipi_replay(void);
 189
 190 static inline void raw_local_irq_restore(unsigned long flags)
 191 {
 192         unsigned long __tmp1;
 193
 194 #ifdef CONFIG_MIPS_MT_SMTC_INSTANT_REPLAY
 195         /*
 196          * CONFIG_MIPS_MT_SMTC_INSTANT_REPLAY does prompt replay of deferred
 197          * IPIs, at the cost of branch and call overhead on each
 198          * local_irq_restore()
 199          */
 200         if (unlikely(!(flags & 0x0400)))
 201                 smtc_ipi_replay();
 202 #endif
 203
 204         __asm__ __volatile__(
 205                 "raw_local_irq_restore\t%0"
 206                 : "=r" (__tmp1)
 207                 : "0" (flags)
 208                 : "memory");
 209 }
 210
 211 static inline int raw_irqs_disabled_flags(unsigned long flags)
 212 {
 213 #ifdef CONFIG_MIPS_MT_SMTC
 214         /*
 215          * SMTC model uses TCStatus.IXMT to disable interrupts for a thread/CPU
 216          */
 217         return flags & 0x400;
 218 #else
 219         return !(flags & 1);
 220 #endif
 221 }
 222
 223 #endif
 224
 225 /*
 226  * Do the CPU's IRQ-state tracing from assembly code.
 227  */
 228 #ifdef CONFIG_TRACE_IRQFLAGS
 229 /* Reload some registers clobbered by trace_hardirqs_on */
 230 #ifdef CONFIG_64BIT
 231 # define TRACE_IRQS_RELOAD_REGS                                         \
 232         LONG_L  $11, PT_R11(sp);                                        \
 233         LONG_L  $10, PT_R10(sp);                                        \
 234         LONG_L  $9, PT_R9(sp);                                          \
 235         LONG_L  $8, PT_R8(sp);                                          \
 236         LONG_L  $7, PT_R7(sp);                                          \
 237         LONG_L  $6, PT_R6(sp);                                          \
 238         LONG_L  $5, PT_R5(sp);                                          \
 239         LONG_L  $4, PT_R4(sp);                                          \
 240         LONG_L  $2, PT_R2(sp)
 241 #else
 242 # define TRACE_IRQS_RELOAD_REGS                                         \
 243         LONG_L  $7, PT_R7(sp);                                          \
 244         LONG_L  $6, PT_R6(sp);                                          \
 245         LONG_L  $5, PT_R5(sp);                                          \
 246         LONG_L  $4, PT_R4(sp);                                          \
 247         LONG_L  $2, PT_R2(sp)
 248 #endif
 249 # define TRACE_IRQS_ON                                                  \
 250         CLI;    /* make sure trace_hardirqs_on() is called in kernel level */ \
 251         jal     trace_hardirqs_on
 252 # define TRACE_IRQS_ON_RELOAD                                           \
 253         TRACE_IRQS_ON;                                                  \
 254         TRACE_IRQS_RELOAD_REGS
 255 # define TRACE_IRQS_OFF                                                 \
 256         jal     trace_hardirqs_off
 257 #else
 258 # define TRACE_IRQS_ON
 259 # define TRACE_IRQS_ON_RELOAD
 260 # define TRACE_IRQS_OFF
 261 #endif
 262
 263 #endif /* _ASM_IRQFLAGS_H */