| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __ASM_SPINLOCK_TYPES_H |
| #define __ASM_SPINLOCK_TYPES_H |
| |
| #define __ARCH_SPIN_LOCK_UNLOCKED_VAL 0x1a46 |
| |
| #define SPINLOCK_BREAK_INSN 0x0000c006 /* break 6,6 */ |
| |
| #ifndef __ASSEMBLY__ |
| |
| typedef struct { |
| volatile unsigned int lock[4]; |
| # define __ARCH_SPIN_LOCK_UNLOCKED \ |
| { { __ARCH_SPIN_LOCK_UNLOCKED_VAL, __ARCH_SPIN_LOCK_UNLOCKED_VAL, \ |
| __ARCH_SPIN_LOCK_UNLOCKED_VAL, __ARCH_SPIN_LOCK_UNLOCKED_VAL } } |
| } arch_spinlock_t; |
| |
| |
| /* counter: |
| * Unlocked : 0x0100_0000 |
| * Read lock(s) : 0x00FF_FFFF to 0x01 (Multiple Readers decrement it) |
| * Write lock : 0x0, but only if prior value is "unlocked" 0x0100_0000 |
| */ |
| typedef struct { |
| arch_spinlock_t lock_mutex; |
| volatile unsigned int counter; |
| } arch_rwlock_t; |
| |
| #endif /* __ASSEMBLY__ */ |
| |
| #define __ARCH_RW_LOCK_UNLOCKED__ 0x01000000 |
| #define __ARCH_RW_LOCK_UNLOCKED { .lock_mutex = __ARCH_SPIN_LOCK_UNLOCKED, \ |
| .counter = __ARCH_RW_LOCK_UNLOCKED__ } |
| |
| #endif |