1 /* SPDX-License-Identifier: GPL-2.0 */
13 #include <asm/asm-const.h>
17  * a "bne-" instruction at the end, so an isync is enough as a acquire barrier
30 	/* -mprefixed can generate offsets beyond range, fall back hack */  in arch_atomic_read()
32 		__asm__ __volatile__("lwz %0,0(%1)" : "=r"(t) : "b"(&v->counter));  in arch_atomic_read()
34 		__asm__ __volatile__("lwz%U1%X1 %0,%1" : "=r"(t) : "m<>"(v->counter));  in arch_atomic_read()
41 	/* -mprefixed can generate offsets beyond range, fall back hack */  in arch_atomic_set()
43 		__asm__ __volatile__("stw %1,0(%2)" : "=m"(v->counter) : "r"(i), "b"(&v->counter));  in arch_atomic_set()
45 		__asm__ __volatile__("stw%U0%X0 %1,%0" : "=m<>"(v->counter) : "r"(i));  in arch_atomic_set()
54 "1:	lwarx	%0,0,%3		# atomic_" #op "\n"			\
57 "	bne-	1b\n"							\
58 	: "=&r" (t), "+m" (v->counter)					\
59 	: "r"#sign (a), "r" (&v->counter)				\
69 "1:	lwarx	%0,0,%3		# atomic_" #op "_return_relaxed\n"	\
72 "	bne-	1b\n"							\
73 	: "=&r" (t), "+m" (v->counter)					\
74 	: "r"#sign (a), "r" (&v->counter)				\
86 "1:	lwarx	%0,0,%4		# atomic_fetch_" #op "_relaxed\n"	\
87 	#asm_op "%I3" suffix " %1,%0,%3\n"				\
88 "	stwcx.	%1,0,%4\n"						\
89 "	bne-	1b\n"							\
90 	: "=&r" (res), "=&r" (t), "+m" (v->counter)			\
91 	: "r"#sign (a), "r" (&v->counter)				\
130  * atomic_fetch_add_unless - add unless the number is a given value
144 "1:	lwarx	%0,0,%1		# atomic_fetch_add_unless\n\  in arch_atomic_fetch_add_unless()
148 "	stwcx.	%0,0,%1 \n\  in arch_atomic_fetch_add_unless()
149 	bne-	1b \n"  in arch_atomic_fetch_add_unless()
154 	: "r" (&v->counter), "rI" (a), "r" (u)  in arch_atomic_fetch_add_unless()
163  * The function returns the old value of *v minus 1, even if
172 "1:	lwarx	%0,0,%1		# atomic_dec_if_positive\n\  in arch_atomic_dec_if_positive()
173 	cmpwi	%0,1\n\  in arch_atomic_dec_if_positive()
174 	addi	%0,%0,-1\n\  in arch_atomic_dec_if_positive()
175 	blt-	2f\n"  in arch_atomic_dec_if_positive()
176 "	stwcx.	%0,0,%1\n\  in arch_atomic_dec_if_positive()
177 	bne-	1b"  in arch_atomic_dec_if_positive()
181 	: "r" (&v->counter)  in arch_atomic_dec_if_positive()
196 	/* -mprefixed can generate offsets beyond range, fall back hack */  in arch_atomic64_read()
198 		__asm__ __volatile__("ld %0,0(%1)" : "=r"(t) : "b"(&v->counter));  in arch_atomic64_read()
200 		__asm__ __volatile__("ld%U1%X1 %0,%1" : "=r"(t) : "m<>"(v->counter));  in arch_atomic64_read()
207 	/* -mprefixed can generate offsets beyond range, fall back hack */  in arch_atomic64_set()
209 		__asm__ __volatile__("std %1,0(%2)" : "=m"(v->counter) : "r"(i), "b"(&v->counter));  in arch_atomic64_set()
211 		__asm__ __volatile__("std%U0%X0 %1,%0" : "=m<>"(v->counter) : "r"(i));  in arch_atomic64_set()
220 "1:	ldarx	%0,0,%3		# atomic64_" #op "\n"			\
223 "	bne-	1b\n"							\
224 	: "=&r" (t), "+m" (v->counter)					\
225 	: "r" (a), "r" (&v->counter)					\
236 "1:	ldarx	%0,0,%3		# atomic64_" #op "_return_relaxed\n"	\
239 "	bne-	1b\n"							\
240 	: "=&r" (t), "+m" (v->counter)					\
241 	: "r" (a), "r" (&v->counter)					\
254 "1:	ldarx	%0,0,%4		# atomic64_fetch_" #op "_relaxed\n"	\
255 	#asm_op " %1,%3,%0\n"						\
256 "	stdcx.	%1,0,%4\n"						\
257 "	bne-	1b\n"							\
258 	: "=&r" (res), "=&r" (t), "+m" (v->counter)			\
259 	: "r" (a), "r" (&v->counter)					\
302 "1:	ldarx	%0,0,%2		# atomic64_inc\n\  in ATOMIC64_OPS()
303 	addic	%0,%0,1\n\  in ATOMIC64_OPS()
305 	bne-	1b"  in ATOMIC64_OPS()
306 	: "=&r" (t), "+m" (v->counter)  in ATOMIC64_OPS()
307 	: "r" (&v->counter)  in ATOMIC64_OPS()
317 "1:	ldarx	%0,0,%2		# atomic64_inc_return_relaxed\n"  in arch_atomic64_inc_return_relaxed()
318 "	addic	%0,%0,1\n"  in arch_atomic64_inc_return_relaxed()
320 "	bne-	1b"  in arch_atomic64_inc_return_relaxed()
321 	: "=&r" (t), "+m" (v->counter)  in arch_atomic64_inc_return_relaxed()
322 	: "r" (&v->counter)  in arch_atomic64_inc_return_relaxed()
333 "1:	ldarx	%0,0,%2		# atomic64_dec\n\  in arch_atomic64_dec()
334 	addic	%0,%0,-1\n\  in arch_atomic64_dec()
336 	bne-	1b"  in arch_atomic64_dec()
337 	: "=&r" (t), "+m" (v->counter)  in arch_atomic64_dec()
338 	: "r" (&v->counter)  in arch_atomic64_dec()
348 "1:	ldarx	%0,0,%2		# atomic64_dec_return_relaxed\n"  in arch_atomic64_dec_return_relaxed()
349 "	addic	%0,%0,-1\n"  in arch_atomic64_dec_return_relaxed()
351 "	bne-	1b"  in arch_atomic64_dec_return_relaxed()
352 	: "=&r" (t), "+m" (v->counter)  in arch_atomic64_dec_return_relaxed()
353 	: "r" (&v->counter)  in arch_atomic64_dec_return_relaxed()
364  * The function returns the old value of *v minus 1.
372 "1:	ldarx	%0,0,%1		# atomic64_dec_if_positive\n\  in arch_atomic64_dec_if_positive()
373 	addic.	%0,%0,-1\n\  in arch_atomic64_dec_if_positive()
374 	blt-	2f\n\  in arch_atomic64_dec_if_positive()
375 	stdcx.	%0,0,%1\n\  in arch_atomic64_dec_if_positive()
376 	bne-	1b"  in arch_atomic64_dec_if_positive()
380 	: "r" (&v->counter)  in arch_atomic64_dec_if_positive()
388  * atomic64_fetch_add_unless - add unless the number is a given value
402 "1:	ldarx	%0,0,%1		# atomic64_fetch_add_unless\n\  in arch_atomic64_fetch_add_unless()
406 "	stdcx.	%0,0,%1 \n\  in arch_atomic64_fetch_add_unless()
407 	bne-	1b \n"  in arch_atomic64_fetch_add_unless()
412 	: "r" (&v->counter), "r" (a), "r" (u)  in arch_atomic64_fetch_add_unless()
420  * atomic_inc64_not_zero - increment unless the number is zero
423  * Atomically increments @v by 1, so long as @v is non-zero.
424  * Returns non-zero if @v was non-zero, and zero otherwise.
432 "1:	ldarx	%0,0,%2		# atomic64_inc_not_zero\n\  in arch_atomic64_inc_not_zero()
434 	beq-	2f\n\  in arch_atomic64_inc_not_zero()
435 	addic	%1,%0,1\n\  in arch_atomic64_inc_not_zero()
436 	stdcx.	%1,0,%2\n\  in arch_atomic64_inc_not_zero()
437 	bne-	1b\n"  in arch_atomic64_inc_not_zero()
442 	: "r" (&v->counter)  in arch_atomic64_inc_not_zero()