1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ARCH_MIPS_LOCAL_H
3 #define _ARCH_MIPS_LOCAL_H
5 #include <linux/percpu.h>
6 #include <linux/bitops.h>
7 #include <linux/atomic.h>
9 #include <asm/cmpxchg.h>
10 #include <asm/compiler.h>
17 #define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
19 #define local_read(l) atomic_long_read(&(l)->a)
20 #define local_set(l, i) atomic_long_set(&(l)->a, (i))
22 #define local_add(i, l) atomic_long_add((i), (&(l)->a))
23 #define local_sub(i, l) atomic_long_sub((i), (&(l)->a))
24 #define local_inc(l) atomic_long_inc(&(l)->a)
25 #define local_dec(l) atomic_long_dec(&(l)->a)
28 * Same as above, but return the result value
30 static __inline__ long local_add_return(long i, local_t * l)
34 if (kernel_uses_llsc) {
39 " .set "MIPS_ISA_ARCH_LEVEL" \n"
40 __SYNC(full, loongson3_war) " \n"
41 "1:" __stringify(LONG_LL) " %1, %2 \n"
42 __stringify(LONG_ADDU) " %0, %1, %3 \n"
43 __stringify(LONG_SC) " %0, %2 \n"
44 __stringify(SC_BEQZ) " %0, 1b \n"
45 __stringify(LONG_ADDU) " %0, %1, %3 \n"
47 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
48 : "Ir" (i), "m" (l->a.counter)
53 local_irq_save(flags);
54 result = l->a.counter;
56 l->a.counter = result;
57 local_irq_restore(flags);
63 static __inline__ long local_sub_return(long i, local_t * l)
67 if (kernel_uses_llsc) {
72 " .set "MIPS_ISA_ARCH_LEVEL" \n"
73 __SYNC(full, loongson3_war) " \n"
74 "1:" __stringify(LONG_LL) " %1, %2 \n"
75 __stringify(LONG_SUBU) " %0, %1, %3 \n"
76 __stringify(LONG_SUBU) " %0, %1, %3 \n"
77 __stringify(LONG_SC) " %0, %2 \n"
78 __stringify(SC_BEQZ) " %0, 1b \n"
79 __stringify(LONG_SUBU) " %0, %1, %3 \n"
81 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
82 : "Ir" (i), "m" (l->a.counter)
87 local_irq_save(flags);
88 result = l->a.counter;
90 l->a.counter = result;
91 local_irq_restore(flags);
97 #define local_cmpxchg(l, o, n) \
98 ((long)cmpxchg_local(&((l)->a.counter), (o), (n)))
99 #define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
102 * local_add_unless - add unless the number is a given value
103 * @l: pointer of type local_t
104 * @a: the amount to add to l...
105 * @u: ...unless l is equal to u.
107 * Atomically adds @a to @l, so long as it was not @u.
108 * Returns non-zero if @l was not @u, and zero otherwise.
110 #define local_add_unless(l, a, u) \
114 while (c != (u) && (old = local_cmpxchg((l), c, c + (a))) != c) \
118 #define local_inc_not_zero(l) local_add_unless((l), 1, 0)
120 #define local_dec_return(l) local_sub_return(1, (l))
121 #define local_inc_return(l) local_add_return(1, (l))
124 * local_sub_and_test - subtract value from variable and test result
125 * @i: integer value to subtract
126 * @l: pointer of type local_t
128 * Atomically subtracts @i from @l and returns
129 * true if the result is zero, or false for all
132 #define local_sub_and_test(i, l) (local_sub_return((i), (l)) == 0)
135 * local_inc_and_test - increment and test
136 * @l: pointer of type local_t
138 * Atomically increments @l by 1
139 * and returns true if the result is zero, or false for all
142 #define local_inc_and_test(l) (local_inc_return(l) == 0)
145 * local_dec_and_test - decrement by 1 and test
146 * @l: pointer of type local_t
148 * Atomically decrements @l by 1 and
149 * returns true if the result is 0, or false for all other
152 #define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
155 * local_add_negative - add and test if negative
156 * @l: pointer of type local_t
157 * @i: integer value to add
159 * Atomically adds @i to @l and returns true
160 * if the result is negative, or false when
161 * result is greater than or equal to zero.
163 #define local_add_negative(i, l) (local_add_return(i, (l)) < 0)
165 /* Use these for per-cpu local_t variables: on some archs they are
166 * much more efficient than these naive implementations. Note they take
167 * a variable, not an address.
170 #define __local_inc(l) ((l)->a.counter++)
171 #define __local_dec(l) ((l)->a.counter++)
172 #define __local_add(i, l) ((l)->a.counter+=(i))
173 #define __local_sub(i, l) ((l)->a.counter-=(i))
175 #endif /* _ARCH_MIPS_LOCAL_H */