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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* bzero.S: Simple prefetching memset, bzero, and clear_user |
3 | * implementations. | |
4 | * | |
5 | * Copyright (C) 2005 David S. Miller <davem@davemloft.net> | |
6 | */ | |
7 | ||
8695c37d | 8 | #include <linux/linkage.h> |
d3867f04 | 9 | #include <asm/export.h> |
8695c37d | 10 | |
1da177e4 LT |
11 | .text |
12 | ||
8695c37d | 13 | ENTRY(memset) /* %o0=buf, %o1=pat, %o2=len */ |
1da177e4 LT |
14 | and %o1, 0xff, %o3 |
15 | mov %o2, %o1 | |
16 | sllx %o3, 8, %g1 | |
17 | or %g1, %o3, %o2 | |
18 | sllx %o2, 16, %g1 | |
19 | or %g1, %o2, %o2 | |
20 | sllx %o2, 32, %g1 | |
21 | ba,pt %xcc, 1f | |
22 | or %g1, %o2, %o2 | |
23 | ||
8695c37d | 24 | ENTRY(__bzero) /* %o0=buf, %o1=len */ |
1da177e4 LT |
25 | clr %o2 |
26 | 1: mov %o0, %o3 | |
27 | brz,pn %o1, __bzero_done | |
28 | cmp %o1, 16 | |
29 | bl,pn %icc, __bzero_tiny | |
30 | prefetch [%o0 + 0x000], #n_writes | |
31 | andcc %o0, 0x3, %g0 | |
32 | be,pt %icc, 2f | |
33 | 1: stb %o2, [%o0 + 0x00] | |
34 | add %o0, 1, %o0 | |
35 | andcc %o0, 0x3, %g0 | |
36 | bne,pn %icc, 1b | |
37 | sub %o1, 1, %o1 | |
38 | 2: andcc %o0, 0x7, %g0 | |
39 | be,pt %icc, 3f | |
40 | stw %o2, [%o0 + 0x00] | |
41 | sub %o1, 4, %o1 | |
42 | add %o0, 4, %o0 | |
43 | 3: and %o1, 0x38, %g1 | |
44 | cmp %o1, 0x40 | |
45 | andn %o1, 0x3f, %o4 | |
46 | bl,pn %icc, 5f | |
47 | and %o1, 0x7, %o1 | |
48 | prefetch [%o0 + 0x040], #n_writes | |
49 | prefetch [%o0 + 0x080], #n_writes | |
50 | prefetch [%o0 + 0x0c0], #n_writes | |
51 | prefetch [%o0 + 0x100], #n_writes | |
52 | prefetch [%o0 + 0x140], #n_writes | |
53 | 4: prefetch [%o0 + 0x180], #n_writes | |
54 | stx %o2, [%o0 + 0x00] | |
55 | stx %o2, [%o0 + 0x08] | |
56 | stx %o2, [%o0 + 0x10] | |
57 | stx %o2, [%o0 + 0x18] | |
58 | stx %o2, [%o0 + 0x20] | |
59 | stx %o2, [%o0 + 0x28] | |
60 | stx %o2, [%o0 + 0x30] | |
61 | stx %o2, [%o0 + 0x38] | |
62 | subcc %o4, 0x40, %o4 | |
63 | bne,pt %icc, 4b | |
64 | add %o0, 0x40, %o0 | |
65 | brz,pn %g1, 6f | |
66 | nop | |
67 | 5: stx %o2, [%o0 + 0x00] | |
68 | subcc %g1, 8, %g1 | |
69 | bne,pt %icc, 5b | |
70 | add %o0, 0x8, %o0 | |
71 | 6: brz,pt %o1, __bzero_done | |
72 | nop | |
73 | __bzero_tiny: | |
74 | 1: stb %o2, [%o0 + 0x00] | |
75 | subcc %o1, 1, %o1 | |
76 | bne,pt %icc, 1b | |
77 | add %o0, 1, %o0 | |
78 | __bzero_done: | |
79 | retl | |
80 | mov %o3, %o0 | |
8695c37d DM |
81 | ENDPROC(__bzero) |
82 | ENDPROC(memset) | |
d3867f04 AV |
83 | EXPORT_SYMBOL(__bzero) |
84 | EXPORT_SYMBOL(memset) | |
1da177e4 LT |
85 | |
86 | #define EX_ST(x,y) \ | |
87 | 98: x,y; \ | |
4d000d5b | 88 | .section __ex_table,"a";\ |
1da177e4 | 89 | .align 4; \ |
40bdac7d | 90 | .word 98b, __retl_o1; \ |
1da177e4 LT |
91 | .text; \ |
92 | .align 4; | |
93 | ||
8695c37d | 94 | ENTRY(__clear_user) /* %o0=buf, %o1=len */ |
c857e3fd | 95 | brz,pn %o1, __clear_user_done |
1da177e4 | 96 | cmp %o1, 16 |
c857e3fd | 97 | bl,pn %icc, __clear_user_tiny |
1da177e4 LT |
98 | EX_ST(prefetcha [%o0 + 0x00] %asi, #n_writes) |
99 | andcc %o0, 0x3, %g0 | |
100 | be,pt %icc, 2f | |
101 | 1: EX_ST(stba %g0, [%o0 + 0x00] %asi) | |
102 | add %o0, 1, %o0 | |
103 | andcc %o0, 0x3, %g0 | |
104 | bne,pn %icc, 1b | |
105 | sub %o1, 1, %o1 | |
106 | 2: andcc %o0, 0x7, %g0 | |
107 | be,pt %icc, 3f | |
108 | EX_ST(stwa %g0, [%o0 + 0x00] %asi) | |
109 | sub %o1, 4, %o1 | |
110 | add %o0, 4, %o0 | |
111 | 3: and %o1, 0x38, %g1 | |
112 | cmp %o1, 0x40 | |
113 | andn %o1, 0x3f, %o4 | |
114 | bl,pn %icc, 5f | |
115 | and %o1, 0x7, %o1 | |
116 | EX_ST(prefetcha [%o0 + 0x040] %asi, #n_writes) | |
117 | EX_ST(prefetcha [%o0 + 0x080] %asi, #n_writes) | |
118 | EX_ST(prefetcha [%o0 + 0x0c0] %asi, #n_writes) | |
119 | EX_ST(prefetcha [%o0 + 0x100] %asi, #n_writes) | |
120 | EX_ST(prefetcha [%o0 + 0x140] %asi, #n_writes) | |
121 | 4: EX_ST(prefetcha [%o0 + 0x180] %asi, #n_writes) | |
122 | EX_ST(stxa %g0, [%o0 + 0x00] %asi) | |
123 | EX_ST(stxa %g0, [%o0 + 0x08] %asi) | |
124 | EX_ST(stxa %g0, [%o0 + 0x10] %asi) | |
125 | EX_ST(stxa %g0, [%o0 + 0x18] %asi) | |
126 | EX_ST(stxa %g0, [%o0 + 0x20] %asi) | |
127 | EX_ST(stxa %g0, [%o0 + 0x28] %asi) | |
128 | EX_ST(stxa %g0, [%o0 + 0x30] %asi) | |
129 | EX_ST(stxa %g0, [%o0 + 0x38] %asi) | |
130 | subcc %o4, 0x40, %o4 | |
131 | bne,pt %icc, 4b | |
132 | add %o0, 0x40, %o0 | |
133 | brz,pn %g1, 6f | |
134 | nop | |
135 | 5: EX_ST(stxa %g0, [%o0 + 0x00] %asi) | |
136 | subcc %g1, 8, %g1 | |
137 | bne,pt %icc, 5b | |
138 | add %o0, 0x8, %o0 | |
c857e3fd | 139 | 6: brz,pt %o1, __clear_user_done |
1da177e4 | 140 | nop |
c857e3fd | 141 | __clear_user_tiny: |
1da177e4 LT |
142 | 1: EX_ST(stba %g0, [%o0 + 0x00] %asi) |
143 | subcc %o1, 1, %o1 | |
144 | bne,pt %icc, 1b | |
145 | add %o0, 1, %o0 | |
c857e3fd | 146 | __clear_user_done: |
1da177e4 LT |
147 | retl |
148 | clr %o0 | |
8695c37d | 149 | ENDPROC(__clear_user) |
d3867f04 | 150 | EXPORT_SYMBOL(__clear_user) |