arch/arm/include/asm/irqflags.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_ARM_IRQFLAGS_H
   3 #define __ASM_ARM_IRQFLAGS_H
   4
   5 #ifdef __KERNEL__
   6
   7 #include <asm/ptrace.h>
   8
   9 /*
  10  * CPU interrupt mask handling.
  11  */
  12 #ifdef CONFIG_CPU_V7M
  13 #define IRQMASK_REG_NAME_R "primask"
  14 #define IRQMASK_REG_NAME_W "primask"
  15 #define IRQMASK_I_BIT   1
  16 #else
  17 #define IRQMASK_REG_NAME_R "cpsr"
  18 #define IRQMASK_REG_NAME_W "cpsr_c"
  19 #define IRQMASK_I_BIT   PSR_I_BIT
  20 #endif
  21
  22 #if __LINUX_ARM_ARCH__ >= 6
  23
  24 #define arch_local_irq_save arch_local_irq_save
  25 static inline unsigned long arch_local_irq_save(void)
  26 {
  27         unsigned long flags;
  28
  29         asm volatile(
  30                 "       mrs     %0, " IRQMASK_REG_NAME_R "      @ arch_local_irq_save\n"
  31                 "       cpsid   i"
  32                 : "=r" (flags) : : "memory", "cc");
  33         return flags;
  34 }
  35
  36 #define arch_local_irq_enable arch_local_irq_enable
  37 static inline void arch_local_irq_enable(void)
  38 {
  39         asm volatile(
  40                 "       cpsie i                 @ arch_local_irq_enable"
  41                 :
  42                 :
  43                 : "memory", "cc");
  44 }
  45
  46 #define arch_local_irq_disable arch_local_irq_disable
  47 static inline void arch_local_irq_disable(void)
  48 {
  49         asm volatile(
  50                 "       cpsid i                 @ arch_local_irq_disable"
  51                 :
  52                 :
  53                 : "memory", "cc");
  54 }
  55
  56 #define local_fiq_enable()  __asm__("cpsie f    @ __stf" : : : "memory", "cc")
  57 #define local_fiq_disable() __asm__("cpsid f    @ __clf" : : : "memory", "cc")
  58
  59 #ifndef CONFIG_CPU_V7M
  60 #define local_abt_enable()  __asm__("cpsie a    @ __sta" : : : "memory", "cc")
  61 #define local_abt_disable() __asm__("cpsid a    @ __cla" : : : "memory", "cc")
  62 #else
  63 #define local_abt_enable()      do { } while (0)
  64 #define local_abt_disable()     do { } while (0)
  65 #endif
  66 #else
  67
  68 /*
  69  * Save the current interrupt enable state & disable IRQs
  70  */
  71 #define arch_local_irq_save arch_local_irq_save
  72 static inline unsigned long arch_local_irq_save(void)
  73 {
  74         unsigned long flags, temp;
  75
  76         asm volatile(
  77                 "       mrs     %0, cpsr        @ arch_local_irq_save\n"
  78                 "       orr     %1, %0, #128\n"
  79                 "       msr     cpsr_c, %1"
  80                 : "=r" (flags), "=r" (temp)
  81                 :
  82                 : "memory", "cc");
  83         return flags;
  84 }
  85
  86 /*
  87  * Enable IRQs
  88  */
  89 #define arch_local_irq_enable arch_local_irq_enable
  90 static inline void arch_local_irq_enable(void)
  91 {
  92         unsigned long temp;
  93         asm volatile(
  94                 "       mrs     %0, cpsr        @ arch_local_irq_enable\n"
  95                 "       bic     %0, %0, #128\n"
  96                 "       msr     cpsr_c, %0"
  97                 : "=r" (temp)
  98                 :
  99                 : "memory", "cc");
 100 }
 101
 102 /*
 103  * Disable IRQs
 104  */
 105 #define arch_local_irq_disable arch_local_irq_disable
 106 static inline void arch_local_irq_disable(void)
 107 {
 108         unsigned long temp;
 109         asm volatile(
 110                 "       mrs     %0, cpsr        @ arch_local_irq_disable\n"
 111                 "       orr     %0, %0, #128\n"
 112                 "       msr     cpsr_c, %0"
 113                 : "=r" (temp)
 114                 :
 115                 : "memory", "cc");
 116 }
 117
 118 /*
 119  * Enable FIQs
 120  */
 121 #define local_fiq_enable()                                      \
 122         ({                                                      \
 123                 unsigned long temp;                             \
 124         __asm__ __volatile__(                                   \
 125         "mrs    %0, cpsr                @ stf\n"                \
 126 "       bic     %0, %0, #64\n"                                  \
 127 "       msr     cpsr_c, %0"                                     \
 128         : "=r" (temp)                                           \
 129         :                                                       \
 130         : "memory", "cc");                                      \
 131         })
 132
 133 /*
 134  * Disable FIQs
 135  */
 136 #define local_fiq_disable()                                     \
 137         ({                                                      \
 138                 unsigned long temp;                             \
 139         __asm__ __volatile__(                                   \
 140         "mrs    %0, cpsr                @ clf\n"                \
 141 "       orr     %0, %0, #64\n"                                  \
 142 "       msr     cpsr_c, %0"                                     \
 143         : "=r" (temp)                                           \
 144         :                                                       \
 145         : "memory", "cc");                                      \
 146         })
 147
 148 #define local_abt_enable()      do { } while (0)
 149 #define local_abt_disable()     do { } while (0)
 150 #endif
 151
 152 /*
 153  * Save the current interrupt enable state.
 154  */
 155 #define arch_local_save_flags arch_local_save_flags
 156 static inline unsigned long arch_local_save_flags(void)
 157 {
 158         unsigned long flags;
 159         asm volatile(
 160                 "       mrs     %0, " IRQMASK_REG_NAME_R "      @ local_save_flags"
 161                 : "=r" (flags) : : "memory", "cc");
 162         return flags;
 163 }
 164
 165 /*
 166  * restore saved IRQ & FIQ state
 167  */
 168 #define arch_local_irq_restore arch_local_irq_restore
 169 static inline void arch_local_irq_restore(unsigned long flags)
 170 {
 171         asm volatile(
 172                 "       msr     " IRQMASK_REG_NAME_W ", %0      @ local_irq_restore"
 173                 :
 174                 : "r" (flags)
 175                 : "memory", "cc");
 176 }
 177
 178 #define arch_irqs_disabled_flags arch_irqs_disabled_flags
 179 static inline int arch_irqs_disabled_flags(unsigned long flags)
 180 {
 181         return flags & IRQMASK_I_BIT;
 182 }
 183
 184 #include <asm-generic/irqflags.h>
 185
 186 #endif /* ifdef __KERNEL__ */
 187 #endif /* ifndef __ASM_ARM_IRQFLAGS_H */