linux/arch/arc/include/asm/spinlock_types.h
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   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
  12typedef 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 */
  27typedef 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
  38