diff options
Diffstat (limited to 'include/asm-mips/semaphore.h')
| -rw-r--r-- | include/asm-mips/semaphore.h | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/include/asm-mips/semaphore.h b/include/asm-mips/semaphore.h index 302f4ff7d..1f713fe49 100644 --- a/include/asm-mips/semaphore.h +++ b/include/asm-mips/semaphore.h @@ -1,4 +1,4 @@ -/* $Id: semaphore.h,v 1.7 1999/06/11 14:30:15 ralf Exp $ +/* $Id: semaphore.h,v 1.6 1999/06/17 13:30:38 ralf Exp $ * * SMP- and interrupt-safe semaphores.. * @@ -133,7 +133,30 @@ extern inline int down_trylock(struct semaphore * sem) #endif #ifdef __MIPSEL__ -#error "FIXME: down_trylock doesn't support little endian machines yet." + __asm__ __volatile__(" + .set mips3 + 0: lld %1, %4 + dli %3, 0x0000000100000000 + sltu %0, %1, $0 + + bltz %1, 1f + move %3, $0 + 1: + + sltu %2, %1, $0 + and %0, %0, %2 + bnez %0, 2f + + subu %0, %3 + scd %1, %4 + + beqz %1, 0b + 2: + + .set mips0" + : "=&r"(ret), "=&r"(tmp), "=&r"(tmp2), "=&r"(sub) + : "m"(*sem) + : "memory"); #endif return ret; |