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 	volatile unsigned int lock[4];
13 # define __ARCH_SPIN_LOCK_UNLOCKED	\
14 	{ { __ARCH_SPIN_LOCK_UNLOCKED_VAL, __ARCH_SPIN_LOCK_UNLOCKED_VAL, \
15 	    __ARCH_SPIN_LOCK_UNLOCKED_VAL, __ARCH_SPIN_LOCK_UNLOCKED_VAL } }
16 } arch_spinlock_t;
17 
18 
19 /* counter:
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 	arch_spinlock_t		lock_mutex;
26 	volatile unsigned int	counter;
27 } arch_rwlock_t;
28 
29 #endif /* __ASSEMBLY__ */
30 
31 #define __ARCH_RW_LOCK_UNLOCKED__       0x01000000
32 #define __ARCH_RW_LOCK_UNLOCKED         { .lock_mutex = __ARCH_SPIN_LOCK_UNLOCKED, \
33 					.counter = __ARCH_RW_LOCK_UNLOCKED__ }
34 
35 #endif
36