arch/arm64/include/asm/spinlock_types.h

   1 /*
   2  * Copyright (C) 2012 ARM Ltd.
   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  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16 #ifndef __ASM_SPINLOCK_TYPES_H
  17 #define __ASM_SPINLOCK_TYPES_H
  18
  19 #if !defined(__LINUX_SPINLOCK_TYPES_H) && !defined(__ASM_SPINLOCK_H)
  20 # error "please don't include this file directly"
  21 #endif
  22
  23 #define TICKET_SHIFT    16
  24
  25 typedef struct {
  26 #ifdef __AARCH64EB__
  27         u16 next;
  28         u16 owner;
  29 #else
  30         u16 owner;
  31         u16 next;
  32 #endif
  33 } __aligned(4) arch_spinlock_t;
  34
  35 #define __ARCH_SPIN_LOCK_UNLOCKED       { 0 , 0 }
  36
  37 typedef struct {
  38         volatile unsigned int lock;
  39 } arch_rwlock_t;
  40
  41 #define __ARCH_RW_LOCK_UNLOCKED         { 0 }
  42
  43 #endif