arch/nios2/include/asm/irqflags.h

   1 /*
   2  * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
   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 as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  *
  17  */
  18 #ifndef _ASM_IRQFLAGS_H
  19 #define _ASM_IRQFLAGS_H
  20
  21 #include <asm/registers.h>
  22
  23 static inline unsigned long arch_local_save_flags(void)
  24 {
  25         return RDCTL(CTL_STATUS);
  26 }
  27
  28 /*
  29  * This will restore ALL status register flags, not only the interrupt
  30  * mask flag.
  31  */
  32 static inline void arch_local_irq_restore(unsigned long flags)
  33 {
  34         WRCTL(CTL_STATUS, flags);
  35 }
  36
  37 static inline void arch_local_irq_disable(void)
  38 {
  39         unsigned long flags;
  40
  41         flags = arch_local_save_flags();
  42         arch_local_irq_restore(flags & ~STATUS_PIE);
  43 }
  44
  45 static inline void arch_local_irq_enable(void)
  46 {
  47         unsigned long flags;
  48
  49         flags = arch_local_save_flags();
  50         arch_local_irq_restore(flags | STATUS_PIE);
  51 }
  52
  53 static inline int arch_irqs_disabled_flags(unsigned long flags)
  54 {
  55         return (flags & STATUS_PIE) == 0;
  56 }
  57
  58 static inline int arch_irqs_disabled(void)
  59 {
  60         return arch_irqs_disabled_flags(arch_local_save_flags());
  61 }
  62
  63 static inline unsigned long arch_local_irq_save(void)
  64 {
  65         unsigned long flags;
  66
  67         flags = arch_local_save_flags();
  68         arch_local_irq_restore(flags & ~STATUS_PIE);
  69         return flags;
  70 }
  71
  72 #endif /* _ASM_IRQFLAGS_H */