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/*
* Copyright 2010 Tilera Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*/
#ifndef _ASM_TILE_SPINLOCK_TYPES_H
#define _ASM_TILE_SPINLOCK_TYPES_H
#ifndef __LINUX_SPINLOCK_TYPES_H
# error "please don't include this file directly"
#endif
#ifdef __tilegx__
/* Low 15 bits are "next"; high 15 bits are "current". */
typedef struct arch_spinlock {
unsigned int lock;
} arch_spinlock_t;
#define __ARCH_SPIN_LOCK_UNLOCKED { 0 }
/* High bit is "writer owns"; low 31 bits are a count of readers. */
typedef struct arch_rwlock {
unsigned int lock;
} arch_rwlock_t;
#define __ARCH_RW_LOCK_UNLOCKED { 0 }
#else
typedef struct arch_spinlock {
/* Next ticket number to hand out. */
int next_ticket;
/* The ticket number that currently owns this lock. */
int current_ticket;
} arch_spinlock_t;
#define __ARCH_SPIN_LOCK_UNLOCKED { 0, 0 }
/*
* Byte 0 for tns (only the low bit is used), byte 1 for ticket-lock "next",
* byte 2 for ticket-lock "current", byte 3 for reader count.
*/
typedef struct arch_rwlock {
unsigned int lock;
} arch_rwlock_t;
#define __ARCH_RW_LOCK_UNLOCKED { 0 }
#endif
#endif /* _ASM_TILE_SPINLOCK_TYPES_H */
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