arch/microblaze/include/asm/irqflags.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2006 Atmark Techno, Inc.
   4  */
   5
   6 #ifndef _ASM_MICROBLAZE_IRQFLAGS_H
   7 #define _ASM_MICROBLAZE_IRQFLAGS_H
   8
   9 #include <linux/types.h>
  10 #include <asm/registers.h>
  11
  12 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
  13
  14 static inline notrace unsigned long arch_local_irq_save(void)
  15 {
  16         unsigned long flags;
  17         asm volatile("  msrclr %0, %1   \n"
  18                      "  nop             \n"
  19                      : "=r"(flags)
  20                      : "i"(MSR_IE)
  21                      : "memory");
  22         return flags;
  23 }
  24
  25 static inline notrace void arch_local_irq_disable(void)
  26 {
  27         /* this uses r0 without declaring it - is that correct? */
  28         asm volatile("  msrclr r0, %0   \n"
  29                      "  nop             \n"
  30                      :
  31                      : "i"(MSR_IE)
  32                      : "memory");
  33 }
  34
  35 static inline notrace void arch_local_irq_enable(void)
  36 {
  37         /* this uses r0 without declaring it - is that correct? */
  38         asm volatile("  msrset  r0, %0  \n"
  39                      "  nop             \n"
  40                      :
  41                      : "i"(MSR_IE)
  42                      : "memory");
  43 }
  44
  45 #else /* !CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
  46
  47 static inline notrace unsigned long arch_local_irq_save(void)
  48 {
  49         unsigned long flags, tmp;
  50         asm volatile (" mfs     %0, rmsr        \n"
  51                       " nop                     \n"
  52                       " andi    %1, %0, %2      \n"
  53                       " mts     rmsr, %1        \n"
  54                       " nop                     \n"
  55                       : "=r"(flags), "=r"(tmp)
  56                       : "i"(~MSR_IE)
  57                       : "memory");
  58         return flags;
  59 }
  60
  61 static inline notrace void arch_local_irq_disable(void)
  62 {
  63         unsigned long tmp;
  64         asm volatile("  mfs     %0, rmsr        \n"
  65                      "  nop                     \n"
  66                      "  andi    %0, %0, %1      \n"
  67                      "  mts     rmsr, %0        \n"
  68                      "  nop                     \n"
  69                      : "=r"(tmp)
  70                      : "i"(~MSR_IE)
  71                      : "memory");
  72 }
  73
  74 static inline notrace void arch_local_irq_enable(void)
  75 {
  76         unsigned long tmp;
  77         asm volatile("  mfs     %0, rmsr        \n"
  78                      "  nop                     \n"
  79                      "  ori     %0, %0, %1      \n"
  80                      "  mts     rmsr, %0        \n"
  81                      "  nop                     \n"
  82                      : "=r"(tmp)
  83                      : "i"(MSR_IE)
  84                      : "memory");
  85 }
  86
  87 #endif /* CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
  88
  89 static inline notrace unsigned long arch_local_save_flags(void)
  90 {
  91         unsigned long flags;
  92         asm volatile("  mfs     %0, rmsr        \n"
  93                      "  nop                     \n"
  94                      : "=r"(flags)
  95                      :
  96                      : "memory");
  97         return flags;
  98 }
  99
 100 static inline notrace void arch_local_irq_restore(unsigned long flags)
 101 {
 102         asm volatile("  mts     rmsr, %0        \n"
 103                      "  nop                     \n"
 104                      :
 105                      : "r"(flags)
 106                      : "memory");
 107 }
 108
 109 static inline notrace bool arch_irqs_disabled_flags(unsigned long flags)
 110 {
 111         return (flags & MSR_IE) == 0;
 112 }
 113
 114 static inline notrace bool arch_irqs_disabled(void)
 115 {
 116         return arch_irqs_disabled_flags(arch_local_save_flags());
 117 }
 118
 119 #endif /* _ASM_MICROBLAZE_IRQFLAGS_H */