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-rw-r--r--include/asm-m32r/atomic.h295
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diff --git a/include/asm-m32r/atomic.h b/include/asm-m32r/atomic.h
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1#ifndef _ASM_M32R_ATOMIC_H
2#define _ASM_M32R_ATOMIC_H
3
4/*
5 * linux/include/asm-m32r/atomic.h
6 *
7 * M32R version:
8 * Copyright (C) 2001, 2002 Hitoshi Yamamoto
9 * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
10 */
11
12#include <linux/config.h>
13#include <asm/assembler.h>
14#include <asm/system.h>
15
16/*
17 * Atomic operations that C can't guarantee us. Useful for
18 * resource counting etc..
19 */
20
21/*
22 * Make sure gcc doesn't try to be clever and move things around
23 * on us. We need to use _exactly_ the address the user gave us,
24 * not some alias that contains the same information.
25 */
26typedef struct { volatile int counter; } atomic_t;
27
28#define ATOMIC_INIT(i) { (i) }
29
30/**
31 * atomic_read - read atomic variable
32 * @v: pointer of type atomic_t
33 *
34 * Atomically reads the value of @v.
35 */
36#define atomic_read(v) ((v)->counter)
37
38/**
39 * atomic_set - set atomic variable
40 * @v: pointer of type atomic_t
41 * @i: required value
42 *
43 * Atomically sets the value of @v to @i.
44 */
45#define atomic_set(v,i) (((v)->counter) = (i))
46
47/**
48 * atomic_add_return - add integer to atomic variable and return it
49 * @i: integer value to add
50 * @v: pointer of type atomic_t
51 *
52 * Atomically adds @i to @v and return (@i + @v).
53 */
54static __inline__ int atomic_add_return(int i, atomic_t *v)
55{
56 unsigned long flags;
57 int result;
58
59 local_irq_save(flags);
60 __asm__ __volatile__ (
61 "# atomic_add_return \n\t"
62 DCACHE_CLEAR("%0", "r4", "%1")
63 M32R_LOCK" %0, @%1; \n\t"
64 "add %0, %2; \n\t"
65 M32R_UNLOCK" %0, @%1; \n\t"
66 : "=&r" (result)
67 : "r" (&v->counter), "r" (i)
68 : "memory"
69#ifdef CONFIG_CHIP_M32700_TS1
70 , "r4"
71#endif /* CONFIG_CHIP_M32700_TS1 */
72 );
73 local_irq_restore(flags);
74
75 return result;
76}
77
78/**
79 * atomic_sub_return - subtract integer from atomic variable and return it
80 * @i: integer value to subtract
81 * @v: pointer of type atomic_t
82 *
83 * Atomically subtracts @i from @v and return (@v - @i).
84 */
85static __inline__ int atomic_sub_return(int i, atomic_t *v)
86{
87 unsigned long flags;
88 int result;
89
90 local_irq_save(flags);
91 __asm__ __volatile__ (
92 "# atomic_sub_return \n\t"
93 DCACHE_CLEAR("%0", "r4", "%1")
94 M32R_LOCK" %0, @%1; \n\t"
95 "sub %0, %2; \n\t"
96 M32R_UNLOCK" %0, @%1; \n\t"
97 : "=&r" (result)
98 : "r" (&v->counter), "r" (i)
99 : "memory"
100#ifdef CONFIG_CHIP_M32700_TS1
101 , "r4"
102#endif /* CONFIG_CHIP_M32700_TS1 */
103 );
104 local_irq_restore(flags);
105
106 return result;
107}
108
109/**
110 * atomic_add - add integer to atomic variable
111 * @i: integer value to add
112 * @v: pointer of type atomic_t
113 *
114 * Atomically adds @i to @v.
115 */
116#define atomic_add(i,v) ((void) atomic_add_return((i), (v)))
117
118/**
119 * atomic_sub - subtract the atomic variable
120 * @i: integer value to subtract
121 * @v: pointer of type atomic_t
122 *
123 * Atomically subtracts @i from @v.
124 */
125#define atomic_sub(i,v) ((void) atomic_sub_return((i), (v)))
126
127/**
128 * atomic_sub_and_test - subtract value from variable and test result
129 * @i: integer value to subtract
130 * @v: pointer of type atomic_t
131 *
132 * Atomically subtracts @i from @v and returns
133 * true if the result is zero, or false for all
134 * other cases.
135 */
136#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
137
138/**
139 * atomic_inc_return - increment atomic variable and return it
140 * @v: pointer of type atomic_t
141 *
142 * Atomically increments @v by 1 and returns the result.
143 */
144static __inline__ int atomic_inc_return(atomic_t *v)
145{
146 unsigned long flags;
147 int result;
148
149 local_irq_save(flags);
150 __asm__ __volatile__ (
151 "# atomic_inc_return \n\t"
152 DCACHE_CLEAR("%0", "r4", "%1")
153 M32R_LOCK" %0, @%1; \n\t"
154 "addi %0, #1; \n\t"
155 M32R_UNLOCK" %0, @%1; \n\t"
156 : "=&r" (result)
157 : "r" (&v->counter)
158 : "memory"
159#ifdef CONFIG_CHIP_M32700_TS1
160 , "r4"
161#endif /* CONFIG_CHIP_M32700_TS1 */
162 );
163 local_irq_restore(flags);
164
165 return result;
166}
167
168/**
169 * atomic_dec_return - decrement atomic variable and return it
170 * @v: pointer of type atomic_t
171 *
172 * Atomically decrements @v by 1 and returns the result.
173 */
174static __inline__ int atomic_dec_return(atomic_t *v)
175{
176 unsigned long flags;
177 int result;
178
179 local_irq_save(flags);
180 __asm__ __volatile__ (
181 "# atomic_dec_return \n\t"
182 DCACHE_CLEAR("%0", "r4", "%1")
183 M32R_LOCK" %0, @%1; \n\t"
184 "addi %0, #-1; \n\t"
185 M32R_UNLOCK" %0, @%1; \n\t"
186 : "=&r" (result)
187 : "r" (&v->counter)
188 : "memory"
189#ifdef CONFIG_CHIP_M32700_TS1
190 , "r4"
191#endif /* CONFIG_CHIP_M32700_TS1 */
192 );
193 local_irq_restore(flags);
194
195 return result;
196}
197
198/**
199 * atomic_inc - increment atomic variable
200 * @v: pointer of type atomic_t
201 *
202 * Atomically increments @v by 1.
203 */
204#define atomic_inc(v) ((void)atomic_inc_return(v))
205
206/**
207 * atomic_dec - decrement atomic variable
208 * @v: pointer of type atomic_t
209 *
210 * Atomically decrements @v by 1.
211 */
212#define atomic_dec(v) ((void)atomic_dec_return(v))
213
214/**
215 * atomic_inc_and_test - increment and test
216 * @v: pointer of type atomic_t
217 *
218 * Atomically increments @v by 1
219 * and returns true if the result is zero, or false for all
220 * other cases.
221 */
222#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
223
224/**
225 * atomic_dec_and_test - decrement and test
226 * @v: pointer of type atomic_t
227 *
228 * Atomically decrements @v by 1 and
229 * returns true if the result is 0, or false for all
230 * other cases.
231 */
232#define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
233
234/**
235 * atomic_add_negative - add and test if negative
236 * @v: pointer of type atomic_t
237 * @i: integer value to add
238 *
239 * Atomically adds @i to @v and returns true
240 * if the result is negative, or false when
241 * result is greater than or equal to zero.
242 */
243#define atomic_add_negative(i,v) (atomic_add_return((i), (v)) < 0)
244
245static __inline__ void atomic_clear_mask(unsigned long mask, atomic_t *addr)
246{
247 unsigned long flags;
248 unsigned long tmp;
249
250 local_irq_save(flags);
251 __asm__ __volatile__ (
252 "# atomic_clear_mask \n\t"
253 DCACHE_CLEAR("%0", "r5", "%1")
254 M32R_LOCK" %0, @%1; \n\t"
255 "and %0, %2; \n\t"
256 M32R_UNLOCK" %0, @%1; \n\t"
257 : "=&r" (tmp)
258 : "r" (addr), "r" (~mask)
259 : "memory"
260#ifdef CONFIG_CHIP_M32700_TS1
261 , "r5"
262#endif /* CONFIG_CHIP_M32700_TS1 */
263 );
264 local_irq_restore(flags);
265}
266
267static __inline__ void atomic_set_mask(unsigned long mask, atomic_t *addr)
268{
269 unsigned long flags;
270 unsigned long tmp;
271
272 local_irq_save(flags);
273 __asm__ __volatile__ (
274 "# atomic_set_mask \n\t"
275 DCACHE_CLEAR("%0", "r5", "%1")
276 M32R_LOCK" %0, @%1; \n\t"
277 "or %0, %2; \n\t"
278 M32R_UNLOCK" %0, @%1; \n\t"
279 : "=&r" (tmp)
280 : "r" (addr), "r" (mask)
281 : "memory"
282#ifdef CONFIG_CHIP_M32700_TS1
283 , "r5"
284#endif /* CONFIG_CHIP_M32700_TS1 */
285 );
286 local_irq_restore(flags);
287}
288
289/* Atomic operations are already serializing on m32r */
290#define smp_mb__before_atomic_dec() barrier()
291#define smp_mb__after_atomic_dec() barrier()
292#define smp_mb__before_atomic_inc() barrier()
293#define smp_mb__after_atomic_inc() barrier()
294
295#endif /* _ASM_M32R_ATOMIC_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-28 09:08:17 -0500