1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* bitops.S: Sparc64 atomic bit operations.
3 *
4 * Copyright (C) 2000, 2007 David S. Miller (d
5 */
6
7 #include <linux/export.h>
8 #include <linux/linkage.h>
9 #include <asm/asi.h>
10 #include <asm/backoff.h>
11
12 .text
13
14 ENTRY(test_and_set_bit) /* %o0=nr, %o1=addr */
15 BACKOFF_SETUP(%o3)
16 srlx %o0, 6, %g1
17 mov 1, %o2
18 sllx %g1, 3, %g3
19 and %o0, 63, %g2
20 sllx %o2, %g2, %o2
21 add %o1, %g3, %o1
22 1: ldx [%o1], %g7
23 or %g7, %o2, %g1
24 casx [%o1], %g7, %g1
25 cmp %g7, %g1
26 bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
27 and %g7, %o2, %g2
28 clr %o0
29 movrne %g2, 1, %o0
30 retl
31 nop
32 2: BACKOFF_SPIN(%o3, %o4, 1b)
33 ENDPROC(test_and_set_bit)
34 EXPORT_SYMBOL(test_and_set_bit)
35
36 ENTRY(test_and_clear_bit) /* %o0=nr, %o1=addr
37 BACKOFF_SETUP(%o3)
38 srlx %o0, 6, %g1
39 mov 1, %o2
40 sllx %g1, 3, %g3
41 and %o0, 63, %g2
42 sllx %o2, %g2, %o2
43 add %o1, %g3, %o1
44 1: ldx [%o1], %g7
45 andn %g7, %o2, %g1
46 casx [%o1], %g7, %g1
47 cmp %g7, %g1
48 bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
49 and %g7, %o2, %g2
50 clr %o0
51 movrne %g2, 1, %o0
52 retl
53 nop
54 2: BACKOFF_SPIN(%o3, %o4, 1b)
55 ENDPROC(test_and_clear_bit)
56 EXPORT_SYMBOL(test_and_clear_bit)
57
58 ENTRY(test_and_change_bit) /* %o0=nr, %o1=addr
59 BACKOFF_SETUP(%o3)
60 srlx %o0, 6, %g1
61 mov 1, %o2
62 sllx %g1, 3, %g3
63 and %o0, 63, %g2
64 sllx %o2, %g2, %o2
65 add %o1, %g3, %o1
66 1: ldx [%o1], %g7
67 xor %g7, %o2, %g1
68 casx [%o1], %g7, %g1
69 cmp %g7, %g1
70 bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
71 and %g7, %o2, %g2
72 clr %o0
73 movrne %g2, 1, %o0
74 retl
75 nop
76 2: BACKOFF_SPIN(%o3, %o4, 1b)
77 ENDPROC(test_and_change_bit)
78 EXPORT_SYMBOL(test_and_change_bit)
79
80 ENTRY(set_bit) /* %o0=nr, %o1=addr */
81 BACKOFF_SETUP(%o3)
82 srlx %o0, 6, %g1
83 mov 1, %o2
84 sllx %g1, 3, %g3
85 and %o0, 63, %g2
86 sllx %o2, %g2, %o2
87 add %o1, %g3, %o1
88 1: ldx [%o1], %g7
89 or %g7, %o2, %g1
90 casx [%o1], %g7, %g1
91 cmp %g7, %g1
92 bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
93 nop
94 retl
95 nop
96 2: BACKOFF_SPIN(%o3, %o4, 1b)
97 ENDPROC(set_bit)
98 EXPORT_SYMBOL(set_bit)
99
100 ENTRY(clear_bit) /* %o0=nr, %o1=addr */
101 BACKOFF_SETUP(%o3)
102 srlx %o0, 6, %g1
103 mov 1, %o2
104 sllx %g1, 3, %g3
105 and %o0, 63, %g2
106 sllx %o2, %g2, %o2
107 add %o1, %g3, %o1
108 1: ldx [%o1], %g7
109 andn %g7, %o2, %g1
110 casx [%o1], %g7, %g1
111 cmp %g7, %g1
112 bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
113 nop
114 retl
115 nop
116 2: BACKOFF_SPIN(%o3, %o4, 1b)
117 ENDPROC(clear_bit)
118 EXPORT_SYMBOL(clear_bit)
119
120 ENTRY(change_bit) /* %o0=nr, %o1=addr */
121 BACKOFF_SETUP(%o3)
122 srlx %o0, 6, %g1
123 mov 1, %o2
124 sllx %g1, 3, %g3
125 and %o0, 63, %g2
126 sllx %o2, %g2, %o2
127 add %o1, %g3, %o1
128 1: ldx [%o1], %g7
129 xor %g7, %o2, %g1
130 casx [%o1], %g7, %g1
131 cmp %g7, %g1
132 bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
133 nop
134 retl
135 nop
136 2: BACKOFF_SPIN(%o3, %o4, 1b)
137 ENDPROC(change_bit)
138 EXPORT_SYMBOL(change_bit)
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