arch/xtensa/include/asm/bitops.h

   1 /*
   2  * Copyright (C) 2001 - 2012 Tensilica Inc.
   3  * Copyright (C) 2014 - 2016 Cadence Design Systems Inc.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #ifndef _XTENSA_BITOPS_H
   9 #define _XTENSA_BITOPS_H
  10
  11 #include <asm/system.h>
  12 #include <asm-generic/bitops/fls.h>
  13 #include <asm-generic/bitops/__fls.h>
  14 #include <asm-generic/bitops/fls64.h>
  15 #include <asm-generic/bitops/__ffs.h>
  16
  17 static inline int test_bit(int nr, const void *addr)
  18 {
  19         return ((unsigned char *)addr)[nr >> 3] & (1u << (nr & 7));
  20 }
  21
  22 static inline int test_and_set_bit(int nr, volatile void *addr)
  23 {
  24         unsigned long flags;
  25         unsigned char tmp;
  26         unsigned char mask = 1u << (nr & 7);
  27
  28         local_irq_save(flags);
  29         tmp = ((unsigned char *)addr)[nr >> 3];
  30         ((unsigned char *)addr)[nr >> 3] |= mask;
  31         local_irq_restore(flags);
  32
  33         return tmp & mask;
  34 }
  35
  36 #endif  /* _XTENSA_BITOPS_H */