arch/arc/include/asm/irqflags.h

   1 /*
   2  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #ifndef __ASM_ARC_IRQFLAGS_H
  10 #define __ASM_ARC_IRQFLAGS_H
  11
  12 /* vineetg: March 2010 : local_irq_save( ) optimisation
  13  *  -Remove explicit mov of current status32 into reg, that is not needed
  14  *  -Use BIC  insn instead of INVERTED + AND
  15  *  -Conditionally disable interrupts (if they are not enabled, don't disable)
  16 */
  17
  18 #ifdef __KERNEL__
  19
  20 #include <asm/arcregs.h>
  21
  22 #ifndef __ASSEMBLY__
  23
  24 /******************************************************************
  25  * IRQ Control Macros
  26  ******************************************************************/
  27
  28 /*
  29  * Save IRQ state and disable IRQs
  30  */
  31 static inline long arch_local_irq_save(void)
  32 {
  33         unsigned long temp, flags;
  34
  35         __asm__ __volatile__(
  36         "       lr  %1, [status32]      \n"
  37         "       bic %0, %1, %2          \n"
  38         "       and.f 0, %1, %2 \n"
  39         "       flag.nz %0              \n"
  40         : "=r"(temp), "=r"(flags)
  41         : "n"((STATUS_E1_MASK | STATUS_E2_MASK))
  42         : "memory", "cc");
  43
  44         return flags;
  45 }
  46
  47 /*
  48  * restore saved IRQ state
  49  */
  50 static inline void arch_local_irq_restore(unsigned long flags)
  51 {
  52
  53         __asm__ __volatile__(
  54         "       flag %0                 \n"
  55         :
  56         : "r"(flags)
  57         : "memory");
  58 }
  59
  60 /*
  61  * Unconditionally Enable IRQs
  62  */
  63 extern void arch_local_irq_enable(void);
  64
  65 /*
  66  * Unconditionally Disable IRQs
  67  */
  68 static inline void arch_local_irq_disable(void)
  69 {
  70         unsigned long temp;
  71
  72         __asm__ __volatile__(
  73         "       lr  %0, [status32]      \n"
  74         "       and %0, %0, %1          \n"
  75         "       flag %0                 \n"
  76         : "=&r"(temp)
  77         : "n"(~(STATUS_E1_MASK | STATUS_E2_MASK))
  78         : "memory");
  79 }
  80
  81 /*
  82  * save IRQ state
  83  */
  84 static inline long arch_local_save_flags(void)
  85 {
  86         unsigned long temp;
  87
  88         __asm__ __volatile__(
  89         "       lr  %0, [status32]      \n"
  90         : "=&r"(temp)
  91         :
  92         : "memory");
  93
  94         return temp;
  95 }
  96
  97 /*
  98  * Query IRQ state
  99  */
 100 static inline int arch_irqs_disabled_flags(unsigned long flags)
 101 {
 102         return !(flags & (STATUS_E1_MASK
 103 #ifdef CONFIG_ARC_COMPACT_IRQ_LEVELS
 104                         | STATUS_E2_MASK
 105 #endif
 106                 ));
 107 }
 108
 109 static inline int arch_irqs_disabled(void)
 110 {
 111         return arch_irqs_disabled_flags(arch_local_save_flags());
 112 }
 113
 114 static inline void arch_mask_irq(unsigned int irq)
 115 {
 116         unsigned int ienb;
 117
 118         ienb = read_aux_reg(AUX_IENABLE);
 119         ienb &= ~(1 << irq);
 120         write_aux_reg(AUX_IENABLE, ienb);
 121 }
 122
 123 static inline void arch_unmask_irq(unsigned int irq)
 124 {
 125         unsigned int ienb;
 126
 127         ienb = read_aux_reg(AUX_IENABLE);
 128         ienb |= (1 << irq);
 129         write_aux_reg(AUX_IENABLE, ienb);
 130 }
 131
 132 #else
 133
 134 .macro IRQ_DISABLE  scratch
 135         lr      \scratch, [status32]
 136         bic     \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)
 137         flag    \scratch
 138 .endm
 139
 140 .macro IRQ_DISABLE_SAVE  scratch, save
 141         lr      \scratch, [status32]
 142         mov     \save, \scratch         /* Make a copy */
 143         bic     \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)
 144         flag    \scratch
 145 .endm
 146
 147 .macro IRQ_ENABLE  scratch
 148         lr      \scratch, [status32]
 149         or      \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)
 150         flag    \scratch
 151 .endm
 152
 153 #endif  /* __ASSEMBLY__ */
 154
 155 #endif  /* KERNEL */
 156
 157 #endif