1 /* SPDX-License-Identifier: GPL-2.0
3  * include/asm-sh/spinlock-llsc.h
18 #define arch_spin_is_locked(x)		((x)->lock <= 0)
32 		"1:						\n\t"  in arch_spin_lock()
33 		"movli.l	@%2, %0	! arch_spin_lock	\n\t"  in arch_spin_lock()
34 		"mov		%0, %1				\n\t"  in arch_spin_lock()
35 		"mov		#0, %0				\n\t"  in arch_spin_lock()
36 		"movco.l	%0, @%2				\n\t"  in arch_spin_lock()
37 		"bf		1b				\n\t"  in arch_spin_lock()
38 		"cmp/pl		%1				\n\t"  in arch_spin_lock()
39 		"bf		1b				\n\t"  in arch_spin_lock()
41 		: "r" (&lock->lock)  in arch_spin_lock()
53 		"mov		#1, %0 ! arch_spin_unlock	\n\t"  in arch_spin_unlock()
54 		"mov.l		%0, @%1				\n\t"  in arch_spin_unlock()
56 		: "r" (&lock->lock)  in arch_spin_unlock()
66 		"1:						\n\t"  in arch_spin_trylock()
67 		"movli.l	@%2, %0	! arch_spin_trylock	\n\t"  in arch_spin_trylock()
68 		"mov		%0, %1				\n\t"  in arch_spin_trylock()
69 		"mov		#0, %0				\n\t"  in arch_spin_trylock()
70 		"movco.l	%0, @%2				\n\t"  in arch_spin_trylock()
71 		"bf		1b				\n\t"  in arch_spin_trylock()
72 		"synco						\n\t"  in arch_spin_trylock()
74 		: "r" (&lock->lock)  in arch_spin_trylock()
82  * Read-write spinlocks, allowing multiple readers but only one writer.
85  * writers. For those circumstances we can "mix" irq-safe locks - any writer
86  * needs to get a irq-safe write-lock, but readers can get non-irqsafe
87  * read-locks.
95 		"1:						\n\t"  in arch_read_lock()
96 		"movli.l	@%1, %0	! arch_read_lock	\n\t"  in arch_read_lock()
97 		"cmp/pl		%0				\n\t"  in arch_read_lock()
98 		"bf		1b				\n\t"  in arch_read_lock()
99 		"add		#-1, %0				\n\t"  in arch_read_lock()
100 		"movco.l	%0, @%1				\n\t"  in arch_read_lock()
101 		"bf		1b				\n\t"  in arch_read_lock()
103 		: "r" (&rw->lock)  in arch_read_lock()
113 		"1:						\n\t"  in arch_read_unlock()
114 		"movli.l	@%1, %0	! arch_read_unlock	\n\t"  in arch_read_unlock()
115 		"add		#1, %0				\n\t"  in arch_read_unlock()
116 		"movco.l	%0, @%1				\n\t"  in arch_read_unlock()
117 		"bf		1b				\n\t"  in arch_read_unlock()
119 		: "r" (&rw->lock)  in arch_read_unlock()
129 		"1:						\n\t"  in arch_write_lock()
130 		"movli.l	@%1, %0	! arch_write_lock	\n\t"  in arch_write_lock()
131 		"cmp/hs		%2, %0				\n\t"  in arch_write_lock()
132 		"bf		1b				\n\t"  in arch_write_lock()
133 		"sub		%2, %0				\n\t"  in arch_write_lock()
134 		"movco.l	%0, @%1				\n\t"  in arch_write_lock()
135 		"bf		1b				\n\t"  in arch_write_lock()
137 		: "r" (&rw->lock), "r" (RW_LOCK_BIAS)  in arch_write_lock()
145 		"mov.l		%1, @%0 ! arch_write_unlock	\n\t"  in arch_write_unlock()
147 		: "r" (&rw->lock), "r" (RW_LOCK_BIAS)  in arch_write_unlock()
157 		"1:						\n\t"  in arch_read_trylock()
158 		"movli.l	@%2, %0	! arch_read_trylock	\n\t"  in arch_read_trylock()
159 		"mov		%0, %1				\n\t"  in arch_read_trylock()
160 		"cmp/pl		%0				\n\t"  in arch_read_trylock()
161 		"bf		2f				\n\t"  in arch_read_trylock()
162 		"add		#-1, %0				\n\t"  in arch_read_trylock()
163 		"movco.l	%0, @%2				\n\t"  in arch_read_trylock()
164 		"bf		1b				\n\t"  in arch_read_trylock()
165 		"2:						\n\t"  in arch_read_trylock()
166 		"synco						\n\t"  in arch_read_trylock()
168 		: "r" (&rw->lock)  in arch_read_trylock()
180 		"1:						\n\t"  in arch_write_trylock()
181 		"movli.l	@%2, %0	! arch_write_trylock	\n\t"  in arch_write_trylock()
182 		"mov		%0, %1				\n\t"  in arch_write_trylock()
183 		"cmp/hs		%3, %0				\n\t"  in arch_write_trylock()
184 		"bf		2f				\n\t"  in arch_write_trylock()
185 		"sub		%3, %0				\n\t"  in arch_write_trylock()
186 		"2:						\n\t"  in arch_write_trylock()
187 		"movco.l	%0, @%2				\n\t"  in arch_write_trylock()
188 		"bf		1b				\n\t"  in arch_write_trylock()
189 		"synco						\n\t"  in arch_write_trylock()
191 		: "r" (&rw->lock), "r" (RW_LOCK_BIAS)  in arch_write_trylock()
195 	return (oldval > (RW_LOCK_BIAS - 1));  in arch_write_trylock()