arch/riscv/include/asm/irqflags.h

   1 /*
   2  * Copyright (C) 2012 Regents of the University of California
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful,
   9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *   GNU General Public License for more details.
  12  */
  13
  14
  15 #ifndef _ASM_RISCV_IRQFLAGS_H
  16 #define _ASM_RISCV_IRQFLAGS_H
  17
  18 #include <asm/processor.h>
  19 #include <asm/csr.h>
  20
  21 /* read interrupt enabled status */
  22 static inline unsigned long arch_local_save_flags(void)
  23 {
  24         return csr_read(sstatus);
  25 }
  26
  27 /* unconditionally enable interrupts */
  28 static inline void arch_local_irq_enable(void)
  29 {
  30         csr_set(sstatus, SR_SIE);
  31 }
  32
  33 /* unconditionally disable interrupts */
  34 static inline void arch_local_irq_disable(void)
  35 {
  36         csr_clear(sstatus, SR_SIE);
  37 }
  38
  39 /* get status and disable interrupts */
  40 static inline unsigned long arch_local_irq_save(void)
  41 {
  42         return csr_read_clear(sstatus, SR_SIE);
  43 }
  44
  45 /* test flags */
  46 static inline int arch_irqs_disabled_flags(unsigned long flags)
  47 {
  48         return !(flags & SR_SIE);
  49 }
  50
  51 /* test hardware interrupt enable bit */
  52 static inline int arch_irqs_disabled(void)
  53 {
  54         return arch_irqs_disabled_flags(arch_local_save_flags());
  55 }
  56
  57 /* set interrupt enabled status */
  58 static inline void arch_local_irq_restore(unsigned long flags)
  59 {
  60         csr_set(sstatus, flags & SR_SIE);
  61 }
  62
  63 #endif /* _ASM_RISCV_IRQFLAGS_H */