20  * There is at most one owner of a spinlock.  There are not different
23  * When trying to obtain a spinlock, the function "spins" forever, or busy-
31  *    1         somebody owns the spinlock
43 			"1:     movi    %0, 1\n"  in arch_spin_lock()
44 			"       s32c1i  %0, %1, 0\n"  in arch_spin_lock()
45 			"       bnez    %0, 1b\n"  in arch_spin_lock()
46 			: "=&a" (tmp)  in arch_spin_lock()
47 			: "a" (&lock->slock)  in arch_spin_lock()
51 /* Returns 1 if the lock is obtained, 0 otherwise. */
60 			"       movi    %0, 1\n"  in arch_spin_trylock()
61 			"       s32c1i  %0, %1, 0\n"  in arch_spin_trylock()
62 			: "=&a" (tmp)  in arch_spin_trylock()
63 			: "a" (&lock->slock)  in arch_spin_trylock()
66 	return tmp == 0 ? 1 : 0;  in arch_spin_trylock()
75 			"       s32ri   %0, %1, 0\n"  in arch_spin_unlock()
76 			: "=&a" (tmp)  in arch_spin_unlock()
77 			: "a" (&lock->slock)  in arch_spin_unlock()
84  * Read-write locks are really a more flexible spinlock.  They allow
87  * there is a write owner).  These rwlocks are unfair to writers.  Writers
105 			"1:     movi    %0, 1\n"  in arch_write_lock()
107 			"       s32c1i  %0, %1, 0\n"  in arch_write_lock()
108 			"       bnez    %0, 1b\n"  in arch_write_lock()
109 			: "=&a" (tmp)  in arch_write_lock()
110 			: "a" (&rw->lock)  in arch_write_lock()
114 /* Returns 1 if the lock is obtained, 0 otherwise. */
123 			"       movi    %0, 1\n"  in arch_write_trylock()
125 			"       s32c1i  %0, %1, 0\n"  in arch_write_trylock()
126 			: "=&a" (tmp)  in arch_write_trylock()
127 			: "a" (&rw->lock)  in arch_write_trylock()
130 	return tmp == 0 ? 1 : 0;  in arch_write_trylock()
139 			"       s32ri   %0, %1, 0\n"  in arch_write_unlock()
140 			: "=&a" (tmp)  in arch_write_unlock()
141 			: "a" (&rw->lock)  in arch_write_unlock()
151 			"1:     l32i    %1, %2, 0\n"  in arch_read_lock()
152 			"       bltz    %1, 1b\n"  in arch_read_lock()
153 			"       wsr     %1, scompare1\n"  in arch_read_lock()
154 			"       addi    %0, %1, 1\n"  in arch_read_lock()
156 			"       bne     %0, %1, 1b\n"  in arch_read_lock()
157 			: "=&a" (result), "=&a" (tmp)  in arch_read_lock()
158 			: "a" (&rw->lock)  in arch_read_lock()
162 /* Returns 1 if the lock is obtained, 0 otherwise. */
170 			"       l32i    %1, %2, 0\n"  in arch_read_trylock()
171 			"       addi    %0, %1, 1\n"  in arch_read_trylock()
172 			"       bltz    %0, 1f\n"  in arch_read_trylock()
173 			"       wsr     %1, scompare1\n"  in arch_read_trylock()
175 			"       sub     %0, %0, %1\n"  in arch_read_trylock()
176 			"1:\n"  in arch_read_trylock()
177 			: "=&a" (result), "=&a" (tmp)  in arch_read_trylock()
178 			: "a" (&rw->lock)  in arch_read_trylock()
189 			"1:     l32i    %1, %2, 0\n"  in arch_read_unlock()
190 			"       addi    %0, %1, -1\n"  in arch_read_unlock()
191 			"       wsr     %1, scompare1\n"  in arch_read_unlock()
193 			"       bne     %0, %1, 1b\n"  in arch_read_unlock()
194 			: "=&a" (tmp1), "=&a" (tmp2)  in arch_read_unlock()
195 			: "a" (&rw->lock)  in arch_read_unlock()