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-rw-r--r--arch/x86/lib/atomic64_32.c273
1 files changed, 51 insertions, 222 deletions
diff --git a/arch/x86/lib/atomic64_32.c b/arch/x86/lib/atomic64_32.c
index 824fa0be55a..540179e8e9f 100644
--- a/arch/x86/lib/atomic64_32.c
+++ b/arch/x86/lib/atomic64_32.c
@@ -6,225 +6,54 @@
6#include <asm/cmpxchg.h> 6#include <asm/cmpxchg.h>
7#include <asm/atomic.h> 7#include <asm/atomic.h>
8 8
9static noinline u64 cmpxchg8b(u64 *ptr, u64 old, u64 new) 9long long atomic64_read_cx8(long long, const atomic64_t *v);
10{ 10EXPORT_SYMBOL(atomic64_read_cx8);
11 u32 low = new; 11long long atomic64_set_cx8(long long, const atomic64_t *v);
12 u32 high = new >> 32; 12EXPORT_SYMBOL(atomic64_set_cx8);
13 13long long atomic64_xchg_cx8(long long, unsigned high);
14 asm volatile( 14EXPORT_SYMBOL(atomic64_xchg_cx8);
15 LOCK_PREFIX "cmpxchg8b %1\n" 15long long atomic64_add_return_cx8(long long a, atomic64_t *v);
16 : "+A" (old), "+m" (*ptr) 16EXPORT_SYMBOL(atomic64_add_return_cx8);
17 : "b" (low), "c" (high) 17long long atomic64_sub_return_cx8(long long a, atomic64_t *v);
18 ); 18EXPORT_SYMBOL(atomic64_sub_return_cx8);
19 return old; 19long long atomic64_inc_return_cx8(long long a, atomic64_t *v);
20} 20EXPORT_SYMBOL(atomic64_inc_return_cx8);
21 21long long atomic64_dec_return_cx8(long long a, atomic64_t *v);
22u64 atomic64_cmpxchg(atomic64_t *ptr, u64 old_val, u64 new_val) 22EXPORT_SYMBOL(atomic64_dec_return_cx8);
23{ 23long long atomic64_dec_if_positive_cx8(atomic64_t *v);
24 return cmpxchg8b(&ptr->counter, old_val, new_val); 24EXPORT_SYMBOL(atomic64_dec_if_positive_cx8);
25} 25int atomic64_inc_not_zero_cx8(atomic64_t *v);
26EXPORT_SYMBOL(atomic64_cmpxchg); 26EXPORT_SYMBOL(atomic64_inc_not_zero_cx8);
27 27int atomic64_add_unless_cx8(atomic64_t *v, long long a, long long u);
28/** 28EXPORT_SYMBOL(atomic64_add_unless_cx8);
29 * atomic64_xchg - xchg atomic64 variable 29
30 * @ptr: pointer to type atomic64_t 30#ifndef CONFIG_X86_CMPXCHG64
31 * @new_val: value to assign 31long long atomic64_read_386(long long, const atomic64_t *v);
32 * 32EXPORT_SYMBOL(atomic64_read_386);
33 * Atomically xchgs the value of @ptr to @new_val and returns 33long long atomic64_set_386(long long, const atomic64_t *v);
34 * the old value. 34EXPORT_SYMBOL(atomic64_set_386);
35 */ 35long long atomic64_xchg_386(long long, unsigned high);
36u64 atomic64_xchg(atomic64_t *ptr, u64 new_val) 36EXPORT_SYMBOL(atomic64_xchg_386);
37{ 37long long atomic64_add_return_386(long long a, atomic64_t *v);
38 /* 38EXPORT_SYMBOL(atomic64_add_return_386);
39 * Try first with a (possibly incorrect) assumption about 39long long atomic64_sub_return_386(long long a, atomic64_t *v);
40 * what we have there. We'll do two loops most likely, 40EXPORT_SYMBOL(atomic64_sub_return_386);
41 * but we'll get an ownership MESI transaction straight away 41long long atomic64_inc_return_386(long long a, atomic64_t *v);
42 * instead of a read transaction followed by a 42EXPORT_SYMBOL(atomic64_inc_return_386);
43 * flush-for-ownership transaction: 43long long atomic64_dec_return_386(long long a, atomic64_t *v);
44 */ 44EXPORT_SYMBOL(atomic64_dec_return_386);
45 u64 old_val, real_val = 0; 45long long atomic64_add_386(long long a, atomic64_t *v);
46 46EXPORT_SYMBOL(atomic64_add_386);
47 do { 47long long atomic64_sub_386(long long a, atomic64_t *v);
48 old_val = real_val; 48EXPORT_SYMBOL(atomic64_sub_386);
49 49long long atomic64_inc_386(long long a, atomic64_t *v);
50 real_val = atomic64_cmpxchg(ptr, old_val, new_val); 50EXPORT_SYMBOL(atomic64_inc_386);
51 51long long atomic64_dec_386(long long a, atomic64_t *v);
52 } while (real_val != old_val); 52EXPORT_SYMBOL(atomic64_dec_386);
53 53long long atomic64_dec_if_positive_386(atomic64_t *v);
54 return old_val; 54EXPORT_SYMBOL(atomic64_dec_if_positive_386);
55} 55int atomic64_inc_not_zero_386(atomic64_t *v);
56EXPORT_SYMBOL(atomic64_xchg); 56EXPORT_SYMBOL(atomic64_inc_not_zero_386);
57 57int atomic64_add_unless_386(atomic64_t *v, long long a, long long u);
58/** 58EXPORT_SYMBOL(atomic64_add_unless_386);
59 * atomic64_set - set atomic64 variable 59#endif
60 * @ptr: pointer to type atomic64_t
61 * @new_val: value to assign
62 *
63 * Atomically sets the value of @ptr to @new_val.
64 */
65void atomic64_set(atomic64_t *ptr, u64 new_val)
66{
67 atomic64_xchg(ptr, new_val);
68}
69EXPORT_SYMBOL(atomic64_set);
70
71/**
72EXPORT_SYMBOL(atomic64_read);
73 * atomic64_add_return - add and return
74 * @delta: integer value to add
75 * @ptr: pointer to type atomic64_t
76 *
77 * Atomically adds @delta to @ptr and returns @delta + *@ptr
78 */
79noinline u64 atomic64_add_return(u64 delta, atomic64_t *ptr)
80{
81 /*
82 * Try first with a (possibly incorrect) assumption about
83 * what we have there. We'll do two loops most likely,
84 * but we'll get an ownership MESI transaction straight away
85 * instead of a read transaction followed by a
86 * flush-for-ownership transaction:
87 */
88 u64 old_val, new_val, real_val = 0;
89
90 do {
91 old_val = real_val;
92 new_val = old_val + delta;
93
94 real_val = atomic64_cmpxchg(ptr, old_val, new_val);
95
96 } while (real_val != old_val);
97
98 return new_val;
99}
100EXPORT_SYMBOL(atomic64_add_return);
101
102u64 atomic64_sub_return(u64 delta, atomic64_t *ptr)
103{
104 return atomic64_add_return(-delta, ptr);
105}
106EXPORT_SYMBOL(atomic64_sub_return);
107
108u64 atomic64_inc_return(atomic64_t *ptr)
109{
110 return atomic64_add_return(1, ptr);
111}
112EXPORT_SYMBOL(atomic64_inc_return);
113
114u64 atomic64_dec_return(atomic64_t *ptr)
115{
116 return atomic64_sub_return(1, ptr);
117}
118EXPORT_SYMBOL(atomic64_dec_return);
119
120/**
121 * atomic64_add - add integer to atomic64 variable
122 * @delta: integer value to add
123 * @ptr: pointer to type atomic64_t
124 *
125 * Atomically adds @delta to @ptr.
126 */
127void atomic64_add(u64 delta, atomic64_t *ptr)
128{
129 atomic64_add_return(delta, ptr);
130}
131EXPORT_SYMBOL(atomic64_add);
132
133/**
134 * atomic64_sub - subtract the atomic64 variable
135 * @delta: integer value to subtract
136 * @ptr: pointer to type atomic64_t
137 *
138 * Atomically subtracts @delta from @ptr.
139 */
140void atomic64_sub(u64 delta, atomic64_t *ptr)
141{
142 atomic64_add(-delta, ptr);
143}
144EXPORT_SYMBOL(atomic64_sub);
145
146/**
147 * atomic64_sub_and_test - subtract value from variable and test result
148 * @delta: integer value to subtract
149 * @ptr: pointer to type atomic64_t
150 *
151 * Atomically subtracts @delta from @ptr and returns
152 * true if the result is zero, or false for all
153 * other cases.
154 */
155int atomic64_sub_and_test(u64 delta, atomic64_t *ptr)
156{
157 u64 new_val = atomic64_sub_return(delta, ptr);
158
159 return new_val == 0;
160}
161EXPORT_SYMBOL(atomic64_sub_and_test);
162
163/**
164 * atomic64_inc - increment atomic64 variable
165 * @ptr: pointer to type atomic64_t
166 *
167 * Atomically increments @ptr by 1.
168 */
169void atomic64_inc(atomic64_t *ptr)
170{
171 atomic64_add(1, ptr);
172}
173EXPORT_SYMBOL(atomic64_inc);
174
175/**
176 * atomic64_dec - decrement atomic64 variable
177 * @ptr: pointer to type atomic64_t
178 *
179 * Atomically decrements @ptr by 1.
180 */
181void atomic64_dec(atomic64_t *ptr)
182{
183 atomic64_sub(1, ptr);
184}
185EXPORT_SYMBOL(atomic64_dec);
186
187/**
188 * atomic64_dec_and_test - decrement and test
189 * @ptr: pointer to type atomic64_t
190 *
191 * Atomically decrements @ptr by 1 and
192 * returns true if the result is 0, or false for all other
193 * cases.
194 */
195int atomic64_dec_and_test(atomic64_t *ptr)
196{
197 return atomic64_sub_and_test(1, ptr);
198}
199EXPORT_SYMBOL(atomic64_dec_and_test);
200
201/**
202 * atomic64_inc_and_test - increment and test
203 * @ptr: pointer to type atomic64_t
204 *
205 * Atomically increments @ptr by 1
206 * and returns true if the result is zero, or false for all
207 * other cases.
208 */
209int atomic64_inc_and_test(atomic64_t *ptr)
210{
211 return atomic64_sub_and_test(-1, ptr);
212}
213EXPORT_SYMBOL(atomic64_inc_and_test);
214
215/**
216 * atomic64_add_negative - add and test if negative
217 * @delta: integer value to add
218 * @ptr: pointer to type atomic64_t
219 *
220 * Atomically adds @delta to @ptr and returns true
221 * if the result is negative, or false when
222 * result is greater than or equal to zero.
223 */
224int atomic64_add_negative(u64 delta, atomic64_t *ptr)
225{
226 s64 new_val = atomic64_add_return(delta, ptr);
227
228 return new_val < 0;
229}
230EXPORT_SYMBOL(atomic64_add_negative);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-25 13:17:03 -0500