patch-2.4.0-test11 linux/include/asm-alpha/semaphore-helper.h

• Lines: 129
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.4.0-test10/linux/include/asm-alpha/semaphore-helper.h
• Orig date: Sun Oct 8 10:50:33 2000

diff -u --recursive --new-file v2.4.0-test10/linux/include/asm-alpha/semaphore-helper.h linux/include/asm-alpha/semaphore-helper.h
@@ -1,128 +0,0 @@
-#ifndef _ALPHA_SEMAPHORE_HELPER_H
-#define _ALPHA_SEMAPHORE_HELPER_H
-
-/*
- * SMP- and interrupt-safe semaphores helper functions.
- *
- * (C) Copyright 1996 Linus Torvalds
- * (C) Copyright 1999 Richard Henderson
- */
-
-/*
- * These two _must_ execute atomically wrt each other.
- *
- * This is trivially done with load_locked/store_cond,
- * which we have.  Let the rest of the losers suck eggs.
- */
-
-static inline void
-wake_one_more(struct semaphore * sem)
-{
-	atomic_inc(&sem->waking);
-}
-
-static inline int
-waking_non_zero(struct semaphore *sem)
-{
-	long ret, tmp;
-
-	/* An atomic conditional decrement.  */
-	__asm__ __volatile__(
-		"1:	ldl_l	%1,%2\n"
-		"	blt	%1,2f\n"
-		"	subl	%1,1,%0\n"
-		"	stl_c	%0,%2\n"
-		"	beq	%0,3f\n"
-		"2:\n"
-		".subsection 2\n"
-		"3:	br	1b\n"
-		".previous"
-		: "=r"(ret), "=r"(tmp), "=m"(sem->waking.counter)
-		: "0"(0));
-
-	return ret > 0;
-}
-
-
-/*
- * waking_non_zero_interruptible:
- *	1	got the lock
- *	0	go to sleep
- *	-EINTR	interrupted
- *
- * We must undo the sem->count down_interruptible decrement
- * simultaneously and atomicly with the sem->waking adjustment,
- * otherwise we can race with wake_one_more.
- *
- * This is accomplished by doing a 64-bit ll/sc on the 2 32-bit words.
- */
-
-static inline int
-waking_non_zero_interruptible(struct semaphore *sem, struct task_struct *tsk)
-{
-	long ret, tmp, tmp2, tmp3;
-
-	/* "Equivalent" C.  Note that we have to do this all without
-	   (taken) branches in order to be a valid ll/sc sequence.
-
-	   do {
-	       tmp = ldq_l;
-	       ret = 0;
-	       if (tmp >= 0) {
-	           tmp += 0xffffffff00000000;
-	           ret = 1;
-	       }
-	       else if (pending) {
-		   // Since -1 + 1 carries into the high word, we have
-		   // to be more careful adding 1 here.
-		   tmp = (tmp & 0xffffffff00000000)
-			 | ((tmp + 1) & 0x00000000ffffffff;
-	           ret = -EINTR;
-	       }
-	       else {
-		   break;	// ideally.  we don't actually break 
-		   		// since this is a predicate we don't
-				// have, and is more trouble to build
-				// than to elide the noop stq_c.
-	       }
-	       tmp = stq_c = tmp;
-	   } while (tmp == 0);
-	*/
-
-	__asm__ __volatile__(
-		"1:	ldq_l	%1,%4\n"
-		"	lda	%0,0\n"
-		"	cmovne	%5,%6,%0\n"
-		"	addq	%1,1,%2\n"
-		"	and	%1,%7,%3\n"
-		"	andnot	%2,%7,%2\n"
-		"	cmovge	%1,1,%0\n"
-		"	or	%3,%2,%2\n"
-		"	addq	%1,%7,%3\n"
-		"	cmovne	%5,%2,%1\n"
-		"	cmovge	%2,%3,%1\n"
-		"	stq_c	%1,%4\n"
-		"	beq	%1,3f\n"
-		"2:\n"
-		".subsection 2\n"
-		"3:	br	1b\n"
-		".previous"
-		: "=&r"(ret), "=&r"(tmp), "=&r"(tmp2), "=&r"(tmp3), "=m"(*sem)
-		: "r"(signal_pending(tsk)), "r"(-EINTR),
-		  "r"(0xffffffff00000000));
-
-	return ret;
-}
-
-/*
- * waking_non_zero_trylock is unused.  we do everything in 
- * down_trylock and let non-ll/sc hosts bounce around.
- */
-
-static inline int
-waking_non_zero_trylock(struct semaphore *sem)
-{
-	return 0;
-}
-
-#endif