release/src-rt-6.x.4708/linux/linux-2.6.36/arch/microblaze/include/asm/irqflags.h

   1 /*
   2  * Copyright (C) 2006 Atmark Techno, Inc.
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License. See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  */
   8
   9 #ifndef _ASM_MICROBLAZE_IRQFLAGS_H
  10 #define _ASM_MICROBLAZE_IRQFLAGS_H
  11
  12 #include <linux/irqflags.h>
  13 #include <asm/registers.h>
  14
  15 # if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
  16
  17 # define raw_local_irq_save(flags)                      \
  18         do {                                            \
  19                 asm volatile (" msrclr %0, %1;          \
  20                                 nop;"                   \
  21                                 : "=r"(flags)           \
  22                                 : "i"(MSR_IE)           \
  23                                 : "memory");            \
  24         } while (0)
  25
  26 # define raw_local_irq_disable()                        \
  27         do {                                            \
  28                 asm volatile (" msrclr r0, %0;          \
  29                                 nop;"                   \
  30                                 :                       \
  31                                 : "i"(MSR_IE)           \
  32                                 : "memory");            \
  33         } while (0)
  34
  35 # define raw_local_irq_enable()                         \
  36         do {                                            \
  37                 asm volatile (" msrset  r0, %0;         \
  38                                 nop;"                   \
  39                                 :                       \
  40                                 : "i"(MSR_IE)           \
  41                                 : "memory");            \
  42         } while (0)
  43
  44 # else /* CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR == 0 */
  45
  46 # define raw_local_irq_save(flags)                              \
  47         do {                                                    \
  48                 register unsigned tmp;                          \
  49                 asm volatile (" mfs     %0, rmsr;               \
  50                                 nop;                            \
  51                                 andi    %1, %0, %2;             \
  52                                 mts     rmsr, %1;               \
  53                                 nop;"                           \
  54                                 : "=r"(flags), "=r" (tmp)       \
  55                                 : "i"(~MSR_IE)                  \
  56                                 : "memory");                    \
  57         } while (0)
  58
  59 # define raw_local_irq_disable()                                \
  60         do {                                                    \
  61                 register unsigned tmp;                          \
  62                 asm volatile (" mfs     %0, rmsr;               \
  63                                 nop;                            \
  64                                 andi    %0, %0, %1;             \
  65                                 mts     rmsr, %0;               \
  66                                 nop;"                   \
  67                                 : "=r"(tmp)                     \
  68                                 : "i"(~MSR_IE)                  \
  69                                 : "memory");                    \
  70         } while (0)
  71
  72 # define raw_local_irq_enable()                                 \
  73         do {                                                    \
  74                 register unsigned tmp;                          \
  75                 asm volatile (" mfs     %0, rmsr;               \
  76                                 nop;                            \
  77                                 ori     %0, %0, %1;             \
  78                                 mts     rmsr, %0;               \
  79                                 nop;"                           \
  80                                 : "=r"(tmp)                     \
  81                                 : "i"(MSR_IE)                   \
  82                                 : "memory");                    \
  83         } while (0)
  84
  85 # endif /* CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
  86
  87 #define raw_local_irq_restore(flags)                            \
  88         do {                                                    \
  89                 asm volatile (" mts     rmsr, %0;               \
  90                                 nop;"                           \
  91                                 :                               \
  92                                 : "r"(flags)                    \
  93                                 : "memory");                    \
  94         } while (0)
  95
  96 static inline unsigned long get_msr(void)
  97 {
  98         unsigned long flags;
  99         asm volatile (" mfs     %0, rmsr;       \
 100                         nop;"                   \
 101                         : "=r"(flags)           \
 102                         :                       \
 103                         : "memory");            \
 104         return flags;
 105 }
 106
 107 #define raw_local_save_flags(flags)     ((flags) = get_msr())
 108 #define raw_irqs_disabled()             ((get_msr() & MSR_IE) == 0)
 109 #define raw_irqs_disabled_flags(flags)  ((flags & MSR_IE) == 0)
 110
 111 #endif /* _ASM_MICROBLAZE_IRQFLAGS_H */