arch/parisc/include/asm/spinlock_types.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_SPINLOCK_TYPES_H
   3 #define __ASM_SPINLOCK_TYPES_H
   4
   5 #define __ARCH_SPIN_LOCK_UNLOCKED_VAL   0x1a46
   6
   7 #define SPINLOCK_BREAK_INSN     0x0000c006      /* break 6,6 */
   8
   9 #ifndef __ASSEMBLY__
  10
  11 typedef struct {
  12 #ifdef CONFIG_PA20
  13         volatile unsigned int slock;
  14 # define __ARCH_SPIN_LOCK_UNLOCKED { __ARCH_SPIN_LOCK_UNLOCKED_VAL }
  15 #else
  16         volatile unsigned int lock[4];
  17 # define __ARCH_SPIN_LOCK_UNLOCKED      \
  18         { { __ARCH_SPIN_LOCK_UNLOCKED_VAL, __ARCH_SPIN_LOCK_UNLOCKED_VAL, \
  19             __ARCH_SPIN_LOCK_UNLOCKED_VAL, __ARCH_SPIN_LOCK_UNLOCKED_VAL } }
  20 #endif
  21 } arch_spinlock_t;
  22
  23
  24 /* counter:
  25  * Unlocked     : 0x0100_0000
  26  * Read lock(s) : 0x00FF_FFFF to 0x01  (Multiple Readers decrement it)
  27  * Write lock   : 0x0, but only if prior value is "unlocked" 0x0100_0000
  28  */
  29 typedef struct {
  30         arch_spinlock_t         lock_mutex;
  31         volatile unsigned int   counter;
  32 } arch_rwlock_t;
  33
  34 #endif /* __ASSEMBLY__ */
  35
  36 #define __ARCH_RW_LOCK_UNLOCKED__       0x01000000
  37 #define __ARCH_RW_LOCK_UNLOCKED         { .lock_mutex = __ARCH_SPIN_LOCK_UNLOCKED, \
  38                                         .counter = __ARCH_RW_LOCK_UNLOCKED__ }
  39
  40 #endif