diff options
Diffstat (limited to 'include/asm-sparc/smpprim.h')
| -rw-r--r-- | include/asm-sparc/smpprim.h | 54 |
1 files changed, 0 insertions, 54 deletions
diff --git a/include/asm-sparc/smpprim.h b/include/asm-sparc/smpprim.h deleted file mode 100644 index eb849d862c64..000000000000 --- a/include/asm-sparc/smpprim.h +++ /dev/null | |||
| @@ -1,54 +0,0 @@ | |||
| 1 | /* | ||
| 2 | * smpprim.h: SMP locking primitives on the Sparc | ||
| 3 | * | ||
| 4 | * God knows we won't be actually using this code for some time | ||
| 5 | * but I thought I'd write it since I knew how. | ||
| 6 | * | ||
| 7 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | ||
| 8 | */ | ||
| 9 | |||
| 10 | #ifndef __SPARC_SMPPRIM_H | ||
| 11 | #define __SPARC_SMPPRIM_H | ||
| 12 | |||
| 13 | /* Test and set the unsigned byte at ADDR to 1. Returns the previous | ||
| 14 | * value. On the Sparc we use the ldstub instruction since it is | ||
| 15 | * atomic. | ||
| 16 | */ | ||
| 17 | |||
| 18 | static inline __volatile__ char test_and_set(void *addr) | ||
| 19 | { | ||
| 20 | char state = 0; | ||
| 21 | |||
| 22 | __asm__ __volatile__("ldstub [%0], %1 ! test_and_set\n\t" | ||
| 23 | "=r" (addr), "=r" (state) : | ||
| 24 | "0" (addr), "1" (state) : "memory"); | ||
| 25 | |||
| 26 | return state; | ||
| 27 | } | ||
| 28 | |||
| 29 | /* Initialize a spin-lock. */ | ||
| 30 | static inline __volatile__ smp_initlock(void *spinlock) | ||
| 31 | { | ||
| 32 | /* Unset the lock. */ | ||
| 33 | *((unsigned char *) spinlock) = 0; | ||
| 34 | |||
| 35 | return; | ||
| 36 | } | ||
| 37 | |||
| 38 | /* This routine spins until it acquires the lock at ADDR. */ | ||
| 39 | static inline __volatile__ smp_lock(void *addr) | ||
| 40 | { | ||
| 41 | while(test_and_set(addr) == 0xff) | ||
| 42 | ; | ||
| 43 | |||
| 44 | /* We now have the lock */ | ||
| 45 | return; | ||
| 46 | } | ||
| 47 | |||
| 48 | /* This routine releases the lock at ADDR. */ | ||
| 49 | static inline __volatile__ smp_unlock(void *addr) | ||
| 50 | { | ||
| 51 | *((unsigned char *) addr) = 0; | ||
| 52 | } | ||
| 53 | |||
| 54 | #endif /* !(__SPARC_SMPPRIM_H) */ | ||
