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Diffstat (limited to 'include/asm-mips64/spinlock.h')
| -rw-r--r-- | include/asm-mips64/spinlock.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/include/asm-mips64/spinlock.h b/include/asm-mips64/spinlock.h new file mode 100644 index 000000000..1dc5fff6a --- /dev/null +++ b/include/asm-mips64/spinlock.h @@ -0,0 +1,76 @@ +/* $Id$ + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#ifndef _ASM_SPINLOCK_H +#define _ASM_SPINLOCK_H + +/* + * These are the generic versions of the spinlocks + * and read-write locks.. We should actually do a + * <linux/spinlock.h> with all of this. Oh, well. + */ +#define spin_lock_irqsave(lock, flags) do { local_irq_save(flags); spin_lock(lock); } while (0) +#define spin_lock_irq(lock) do { local_irq_disable(); spin_lock(lock); } while (0) +#define spin_lock_bh(lock) do { local_bh_disable(); spin_lock(lock); } while (0) + +#define read_lock_irqsave(lock, flags) do { local_irq_save(flags); read_lock(lock); } while (0) +#define read_lock_irq(lock) do { local_irq_disable(); read_lock(lock); } while (0) +#define read_lock_bh(lock) do { local_bh_disable(); read_lock(lock); } while (0) + +#define write_lock_irqsave(lock, flags) do { local_irq_save(flags); write_lock(lock); } while (0) +#define write_lock_irq(lock) do { local_irq_disable(); write_lock(lock); } while (0) +#define write_lock_bh(lock) do { local_bh_disable(); write_lock(lock); } while (0) + +#define spin_unlock_irqrestore(lock, flags) do { spin_unlock(lock); local_irq_restore(flags); } while (0) +#define spin_unlock_irq(lock) do { spin_unlock(lock); local_irq_enable(); } while (0) +#define spin_unlock_bh(lock) do { spin_unlock(lock); local_bh_enable(); } while (0) + +#define read_unlock_irqrestore(lock, flags) do { read_unlock(lock); local_irq_restore(flags); } while (0) +#define read_unlock_irq(lock) do { read_unlock(lock); local_irq_enable(); } while (0) +#define read_unlock_bh(lock) do { read_unlock(lock); local_bh_enable(); } while (0) + +#define write_unlock_irqrestore(lock, flags) do { write_unlock(lock); local_irq_restore(flags); } while (0) +#define write_unlock_irq(lock) do { write_unlock(lock); local_irq_enable(); } while (0) +#define write_unlock_bh(lock) do { write_unlock(lock); local_bh_enable(); } while (0) + +#ifndef __SMP__ + +/* + * Gcc-2.7.x has a nasty bug with empty initializers. + */ +typedef struct { } spinlock_t; +#define SPIN_LOCK_UNLOCKED (spinlock_t) { } + +#define spin_lock_init(lock) do { } while(0) +#define spin_lock(lock) (void)(lock) /* Not "unused variable". */ +#define spin_trylock(lock) (1) +#define spin_unlock_wait(lock) do { } while(0) +#define spin_unlock(lock) (void)(lock) /* Not "unused variable". */ + +/* + * Read-write spinlocks, allowing multiple readers + * but only one writer. + * + * NOTE! it is quite common to have readers in interrupts + * but no interrupt writers. For those circumstances we + * can "mix" irq-safe locks - any writer needs to get a + * irq-safe write-lock, but readers can get non-irqsafe + * read-locks. + */ +typedef struct { } rwlock_t; +#define RW_LOCK_UNLOCKED (rwlock_t) { } + +#define read_lock(lock) (void)(lock) /* Not "unused variable". */ +#define read_unlock(lock) do { } while(0) +#define write_lock(lock) (void)(lock) /* Not "unused variable". */ +#define write_unlock(lock) do { } while(0) + +#else + +#error "Nix SMP on MIPS" + +#endif /* SMP */ +#endif /* _ASM_SPINLOCK_H */ |