root/arch/arc/include/asm/spinlock_types.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   4  */
   5 
   6 #ifndef __ASM_SPINLOCK_TYPES_H
   7 #define __ASM_SPINLOCK_TYPES_H
   8 
   9 typedef struct {
  10         volatile unsigned int slock;
  11 } arch_spinlock_t;
  12 
  13 #define __ARCH_SPIN_LOCK_UNLOCKED__     0
  14 #define __ARCH_SPIN_LOCK_LOCKED__       1
  15 
  16 #define __ARCH_SPIN_LOCK_UNLOCKED       { __ARCH_SPIN_LOCK_UNLOCKED__ }
  17 #define __ARCH_SPIN_LOCK_LOCKED         { __ARCH_SPIN_LOCK_LOCKED__ }
  18 
  19 /*
  20  * Unlocked     : 0x0100_0000
  21  * Read lock(s) : 0x00FF_FFFF to 0x01  (Multiple Readers decrement it)
  22  * Write lock   : 0x0, but only if prior value is "unlocked" 0x0100_0000
  23  */
  24 typedef struct {
  25         volatile unsigned int   counter;
  26 #ifndef CONFIG_ARC_HAS_LLSC
  27         arch_spinlock_t         lock_mutex;
  28 #endif
  29 } arch_rwlock_t;
  30 
  31 #define __ARCH_RW_LOCK_UNLOCKED__       0x01000000
  32 #define __ARCH_RW_LOCK_UNLOCKED         { .counter = __ARCH_RW_LOCK_UNLOCKED__ }
  33 
  34 #endif