1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 2deae26bfSKyle McMartin #ifndef __ASM_SPINLOCK_TYPES_H 3deae26bfSKyle McMartin #define __ASM_SPINLOCK_TYPES_H 4deae26bfSKyle McMartin 515e64ef6SHelge Deller #define __ARCH_SPIN_LOCK_UNLOCKED_VAL 0x1a46 615e64ef6SHelge Deller 7*a0f4b787SHelge Deller #define SPINLOCK_BREAK_INSN 0x0000c006 /* break 6,6 */ 8*a0f4b787SHelge Deller 9*a0f4b787SHelge Deller #ifndef __ASSEMBLY__ 10*a0f4b787SHelge Deller 11deae26bfSKyle McMartin typedef struct { 12deae26bfSKyle McMartin volatile unsigned int lock[4]; 1315e64ef6SHelge Deller # define __ARCH_SPIN_LOCK_UNLOCKED \ 1415e64ef6SHelge Deller { { __ARCH_SPIN_LOCK_UNLOCKED_VAL, __ARCH_SPIN_LOCK_UNLOCKED_VAL, \ 1515e64ef6SHelge Deller __ARCH_SPIN_LOCK_UNLOCKED_VAL, __ARCH_SPIN_LOCK_UNLOCKED_VAL } } 16445c8951SThomas Gleixner } arch_spinlock_t; 17deae26bfSKyle McMartin 18fbdc8f0fSHelge Deller 19fbdc8f0fSHelge Deller /* counter: 20fbdc8f0fSHelge Deller * Unlocked : 0x0100_0000 21fbdc8f0fSHelge Deller * Read lock(s) : 0x00FF_FFFF to 0x01 (Multiple Readers decrement it) 22fbdc8f0fSHelge Deller * Write lock : 0x0, but only if prior value is "unlocked" 0x0100_0000 23fbdc8f0fSHelge Deller */ 24deae26bfSKyle McMartin typedef struct { 25fbdc8f0fSHelge Deller arch_spinlock_t lock_mutex; 26fbdc8f0fSHelge Deller volatile unsigned int counter; 27fb3a6bbcSThomas Gleixner } arch_rwlock_t; 28deae26bfSKyle McMartin 29*a0f4b787SHelge Deller #endif /* __ASSEMBLY__ */ 30*a0f4b787SHelge Deller 31fbdc8f0fSHelge Deller #define __ARCH_RW_LOCK_UNLOCKED__ 0x01000000 32fbdc8f0fSHelge Deller #define __ARCH_RW_LOCK_UNLOCKED { .lock_mutex = __ARCH_SPIN_LOCK_UNLOCKED, \ 33fbdc8f0fSHelge Deller .counter = __ARCH_RW_LOCK_UNLOCKED__ } 34deae26bfSKyle McMartin 35deae26bfSKyle McMartin #endif 36