arch/arc/include/asm/irqflags-compact.h

   1 /*
   2  * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
   3  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9
  10 #ifndef __ASM_IRQFLAGS_ARCOMPACT_H
  11 #define __ASM_IRQFLAGS_ARCOMPACT_H
  12
  13 /* vineetg: March 2010 : local_irq_save( ) optimisation
  14  *  -Remove explicit mov of current status32 into reg, that is not needed
  15  *  -Use BIC  insn instead of INVERTED + AND
  16  *  -Conditionally disable interrupts (if they are not enabled, don't disable)
  17 */
  18
  19 #include <asm/arcregs.h>
  20
  21 /* status32 Reg bits related to Interrupt Handling */
  22 #define STATUS_E1_BIT           1       /* Int 1 enable */
  23 #define STATUS_E2_BIT           2       /* Int 2 enable */
  24 #define STATUS_A1_BIT           3       /* Int 1 active */
  25 #define STATUS_A2_BIT           4       /* Int 2 active */
  26 #define STATUS_AE_BIT           5       /* Exception active */
  27
  28 #define STATUS_E1_MASK          (1<<STATUS_E1_BIT)
  29 #define STATUS_E2_MASK          (1<<STATUS_E2_BIT)
  30 #define STATUS_A1_MASK          (1<<STATUS_A1_BIT)
  31 #define STATUS_A2_MASK          (1<<STATUS_A2_BIT)
  32 #define STATUS_AE_MASK          (1<<STATUS_AE_BIT)
  33 #define STATUS_IE_MASK          (STATUS_E1_MASK | STATUS_E2_MASK)
  34
  35 /* Other Interrupt Handling related Aux regs */
  36 #define AUX_IRQ_LEV             0x200   /* IRQ Priority: L1 or L2 */
  37 #define AUX_IRQ_HINT            0x201   /* For generating Soft Interrupts */
  38 #define AUX_IRQ_LV12            0x43    /* interrupt level register */
  39
  40 #define AUX_IENABLE             0x40c
  41 #define AUX_ITRIGGER            0x40d
  42 #define AUX_IPULSE              0x415
  43
  44 #define ISA_INIT_STATUS_BITS    STATUS_IE_MASK
  45
  46 #define ISA_SLEEP_ARG           0x3
  47
  48 #ifndef __ASSEMBLY__
  49
  50 /******************************************************************
  51  * IRQ Control Macros
  52  *
  53  * All of them have "memory" clobber (compiler barrier) which is needed to
  54  * ensure that LD/ST requiring irq safetly (R-M-W when LLSC is not available)
  55  * are redone after IRQs are re-enabled (and gcc doesn't reuse stale register)
  56  *
  57  * Noted at the time of Abilis Timer List corruption
  58  *      Orig Bug + Rejected solution    : https://lkml.org/lkml/2013/3/29/67
  59  *      Reasoning                       : https://lkml.org/lkml/2013/4/8/15
  60  *
  61  ******************************************************************/
  62
  63 /*
  64  * Save IRQ state and disable IRQs
  65  */
  66 static inline long arch_local_irq_save(void)
  67 {
  68         unsigned long temp, flags;
  69
  70         __asm__ __volatile__(
  71         "       lr  %1, [status32]      \n"
  72         "       bic %0, %1, %2          \n"
  73         "       and.f 0, %1, %2 \n"
  74         "       flag.nz %0              \n"
  75         : "=r"(temp), "=r"(flags)
  76         : "n"((STATUS_E1_MASK | STATUS_E2_MASK))
  77         : "memory", "cc");
  78
  79         return flags;
  80 }
  81
  82 /*
  83  * restore saved IRQ state
  84  */
  85 static inline void arch_local_irq_restore(unsigned long flags)
  86 {
  87
  88         __asm__ __volatile__(
  89         "       flag %0                 \n"
  90         :
  91         : "r"(flags)
  92         : "memory");
  93 }
  94
  95 /*
  96  * Unconditionally Enable IRQs
  97  */
  98 static inline void arch_local_irq_enable(void)
  99 {
 100         unsigned long temp;
 101
 102         __asm__ __volatile__(
 103         "       lr   %0, [status32]     \n"
 104         "       or   %0, %0, %1         \n"
 105         "       flag %0                 \n"
 106         : "=&r"(temp)
 107         : "n"((STATUS_E1_MASK | STATUS_E2_MASK))
 108         : "cc", "memory");
 109 }
 110
 111
 112 /*
 113  * Unconditionally Disable IRQs
 114  */
 115 static inline void arch_local_irq_disable(void)
 116 {
 117         unsigned long temp;
 118
 119         __asm__ __volatile__(
 120         "       lr  %0, [status32]      \n"
 121         "       and %0, %0, %1          \n"
 122         "       flag %0                 \n"
 123         : "=&r"(temp)
 124         : "n"(~(STATUS_E1_MASK | STATUS_E2_MASK))
 125         : "memory");
 126 }
 127
 128 /*
 129  * save IRQ state
 130  */
 131 static inline long arch_local_save_flags(void)
 132 {
 133         unsigned long temp;
 134
 135         __asm__ __volatile__(
 136         "       lr  %0, [status32]      \n"
 137         : "=&r"(temp)
 138         :
 139         : "memory");
 140
 141         return temp;
 142 }
 143
 144 /*
 145  * Query IRQ state
 146  */
 147 static inline int arch_irqs_disabled_flags(unsigned long flags)
 148 {
 149         return !(flags & (STATUS_E1_MASK
 150 #ifdef CONFIG_ARC_COMPACT_IRQ_LEVELS
 151                         | STATUS_E2_MASK
 152 #endif
 153                 ));
 154 }
 155
 156 static inline int arch_irqs_disabled(void)
 157 {
 158         return arch_irqs_disabled_flags(arch_local_save_flags());
 159 }
 160
 161 #else
 162
 163 #ifdef CONFIG_TRACE_IRQFLAGS
 164
 165 .macro TRACE_ASM_IRQ_DISABLE
 166         bl      trace_hardirqs_off
 167 .endm
 168
 169 .macro TRACE_ASM_IRQ_ENABLE
 170         bl      trace_hardirqs_on
 171 .endm
 172
 173 #else
 174
 175 .macro TRACE_ASM_IRQ_DISABLE
 176 .endm
 177
 178 .macro TRACE_ASM_IRQ_ENABLE
 179 .endm
 180
 181 #endif
 182
 183 .macro IRQ_DISABLE  scratch
 184         lr      \scratch, [status32]
 185         bic     \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)
 186         flag    \scratch
 187         TRACE_ASM_IRQ_DISABLE
 188 .endm
 189
 190 .macro IRQ_ENABLE  scratch
 191         TRACE_ASM_IRQ_ENABLE
 192         lr      \scratch, [status32]
 193         or      \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)
 194         flag    \scratch
 195 .endm
 196
 197 #endif  /* __ASSEMBLY__ */
 198
 199 #endif