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git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@5 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

OPTYap/mips_locks_funcs.h

@@ -0,0 +1,115 @@
+/* ------------------------------- **
+**      Atomic locking for MIPS    **
+** ------------------------------- */
+
+static __inline__ int test_and_set_bit(int nr, volatile void *addr)
+{
+	int	mask, retval, mw;
+
+	mask = 1;
+	do {
+		mw = load_linked(addr);
+		retval = (mask & mw) != 0;
+	} while (!store_conditional(addr, mw|mask));
+
+	return retval;
+}
+
+static inline void _spin_lock(__dummy_lock_t *lock)
+{
+	unsigned int tmp;
+
+	__asm__ __volatile__(
+	".set\tnoreorder\t\t\t# spin_lock\n"
+	"1:\tll\t%1, %2\n\t"
+	"bnez\t%1, 1b\n\t"
+	" li\t%1, 1\n\t"
+	"sc\t%1, %0\n\t"
+	"beqz\t%1, 1b\n\t"
+	" sync\n\t"
+	".set\treorder"
+	: "=o" (__dummy_lock(lock)), "=&r" (tmp)
+	: "o" (__dummy_lock(lock))
+	: "memory");
+}
+
+static inline void spin_unlock(__dummy_lock_t *lock)
+{
+	__asm__ __volatile__(
+	".set\tnoreorder\t\t\t# spin_unlock\n\t"
+	"sync\n\t"
+	"sw\t$0, %0\n\t"
+	".set\treorder"	
+	: "=o" (__dummy_lock(lock))
+	: "o" (__dummy_lock(lock))
+	: "memory");
+}
+
+static inline void _read_lock(rwlock_t *rw)
+{
+	unsigned int tmp;
+
+	__asm__ __volatile__(
+	".set\tnoreorder\t\t\t# read_lock\n"
+	"1:\tll\t%1, %2\n\t"
+	"bltz\t%1, 1b\n\t"
+	" addu\t%1, 1\n\t"
+	"sc\t%1, %0\n\t"
+	"beqz\t%1, 1b\n\t"
+	" sync\n\t"
+	".set\treorder"	
+	: "=o" (__dummy_lock(rw)), "=&r" (tmp)
+	: "o" (__dummy_lock(rw))
+	: "memory");
+}
+
+/* Note the use of sub, not subu which will make the kernel die with an
+   overflow exception if we ever try to unlock an rwlock that is already
+   unlocked or is being held by a writer.  */
+static inline void _read_unlock(rwlock_t *rw)
+{
+	unsigned int tmp;
+
+	__asm__ __volatile__(
+	".set\tnoreorder\t\t\t# read_unlock\n"
+	"1:\tll\t%1, %2\n\t"
+	"sub\t%1, 1\n\t"
+	"sc\t%1, %0\n\t"
+	"beqz\t%1, 1b\n\t"
+	".set\treorder"	
+	: "=o" (__dummy_lock(rw)), "=&r" (tmp)
+	: "o" (__dummy_lock(rw))
+	: "memory");
+}
+
+static inline void _write_lock(rwlock_t *rw)
+{
+	unsigned int tmp;
+
+	__asm__ __volatile__(
+	".set\tnoreorder\t\t\t# write_lock\n"
+	"1:\tll\t%1, %2\n\t"
+	"bnez\t%1, 1b\n\t"
+	" lui\t%1, 0x8000\n\t"
+	"sc\t%1, %0\n\t"
+	"beqz\t%1, 1b\n\t"
+	" sync\n\t"
+	".set\treorder"	
+	: "=o" (__dummy_lock(rw)), "=&r" (tmp)
+	: "o" (__dummy_lock(rw))
+	: "memory");
+}
+
+static inline void _write_unlock(rwlock_t *rw)
+{
+	__asm__ __volatile__(
+	".set\tnoreorder\t\t\t# write_unlock\n\t"
+	"sync\n\t"
+	"sw\t$0, %0\n\t"
+	".set\treorder"	
+	: "=o" (__dummy_lock(rw))
+	: "o" (__dummy_lock(rw))
+	: "memory");
+}
+
+