arch/arc/include/asm/spinlock_types.h

   1 /*
   2  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   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 version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #ifndef __ASM_SPINLOCK_TYPES_H
  10 #define __ASM_SPINLOCK_TYPES_H
  11
  12 typedef struct {
  13         volatile unsigned int slock;
  14 } arch_spinlock_t;
  15
  16 #define __ARCH_SPIN_LOCK_UNLOCKED__     0
  17 #define __ARCH_SPIN_LOCK_LOCKED__       1
  18
  19 #define __ARCH_SPIN_LOCK_UNLOCKED       { __ARCH_SPIN_LOCK_UNLOCKED__ }
  20 #define __ARCH_SPIN_LOCK_LOCKED         { __ARCH_SPIN_LOCK_LOCKED__ }
  21
  22 /*
  23  * Unlocked     : 0x0100_0000
  24  * Read lock(s) : 0x00FF_FFFF to 0x01  (Multiple Readers decrement it)
  25  * Write lock   : 0x0, but only if prior value is "unlocked" 0x0100_0000
  26  */
  27 typedef struct {
  28         volatile unsigned int   counter;
  29 #ifndef CONFIG_ARC_HAS_LLSC
  30         arch_spinlock_t         lock_mutex;
  31 #endif
  32 } arch_rwlock_t;
  33
  34 #define __ARCH_RW_LOCK_UNLOCKED__       0x01000000
  35 #define __ARCH_RW_LOCK_UNLOCKED         { .counter = __ARCH_RW_LOCK_UNLOCKED__ }
  36
  37 #endif