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Diffstat (limited to '')
-rw-r--r-- | arch/parisc/include/asm/spinlock_types.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/spinlock_types.h b/arch/parisc/include/asm/spinlock_types.h new file mode 100644 index 000000000..35c5086b7 --- /dev/null +++ b/arch/parisc/include/asm/spinlock_types.h @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_SPINLOCK_TYPES_H +#define __ASM_SPINLOCK_TYPES_H + +typedef struct { + volatile unsigned int lock[4]; +# define __ARCH_SPIN_LOCK_UNLOCKED { { 1, 1, 1, 1 } } +} 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; + +#define __ARCH_RW_LOCK_UNLOCKED__ 0x01000000 +#define __ARCH_RW_LOCK_UNLOCKED { .lock_mutex = __ARCH_SPIN_LOCK_UNLOCKED, \ + .counter = __ARCH_RW_LOCK_UNLOCKED__ } + +#endif |