1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
6 #ifndef __ASM_SPINLOCK_TYPES_H
7 #define __ASM_SPINLOCK_TYPES_H
10 volatile unsigned int slock;
13 #define __ARCH_SPIN_LOCK_UNLOCKED__ 0
14 #define __ARCH_SPIN_LOCK_LOCKED__ 1
16 #define __ARCH_SPIN_LOCK_UNLOCKED { __ARCH_SPIN_LOCK_UNLOCKED__ }
17 #define __ARCH_SPIN_LOCK_LOCKED { __ARCH_SPIN_LOCK_LOCKED__ }
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
25 volatile unsigned int counter;
26 #ifndef CONFIG_ARC_HAS_LLSC
27 arch_spinlock_t lock_mutex;
31 #define __ARCH_RW_LOCK_UNLOCKED__ 0x01000000
32 #define __ARCH_RW_LOCK_UNLOCKED { .counter = __ARCH_RW_LOCK_UNLOCKED__ }