1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* bzero.S: Simple prefetching memset, bzero,
3 * implementations.
4 *
5 * Copyright (C) 2005 David S. Miller <davem@da
6 */
7
8 #include <linux/export.h>
9 #include <linux/linkage.h>
10
11 .text
12
13 ENTRY(memset) /* %o0=buf, %o1=pat, %o2=len */
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
24 ENTRY(__bzero) /* %o0=buf, %o1=len */
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_writ
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_writ
49 prefetch [%o0 + 0x080], #n_writ
50 prefetch [%o0 + 0x0c0], #n_writ
51 prefetch [%o0 + 0x100], #n_writ
52 prefetch [%o0 + 0x140], #n_writ
53 4: prefetch [%o0 + 0x180], #n_writ
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
81 ENDPROC(__bzero)
82 ENDPROC(memset)
83 EXPORT_SYMBOL(__bzero)
84 EXPORT_SYMBOL(memset)
85
86 #define EX_ST(x,y) \
87 98: x,y; \
88 .section __ex_table,"a";\
89 .align 4; \
90 .word 98b, __retl_o1; \
91 .text; \
92 .align 4;
93
94 ENTRY(__clear_user) /* %o0=buf, %o1=len */
95 brz,pn %o1, __clear_user_done
96 cmp %o1, 16
97 bl,pn %icc, __clear_user_tin
98 EX_ST(prefetcha [%o0 + 0x00] %asi, #n
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
117 EX_ST(prefetcha [%o0 + 0x080] %asi, #n
118 EX_ST(prefetcha [%o0 + 0x0c0] %asi, #n
119 EX_ST(prefetcha [%o0 + 0x100] %asi, #n
120 EX_ST(prefetcha [%o0 + 0x140] %asi, #n
121 4: EX_ST(prefetcha [%o0 + 0x180] %asi, #n
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
139 6: brz,pt %o1, __clear_user_done
140 nop
141 __clear_user_tiny:
142 1: EX_ST(stba %g0, [%o0 + 0x00] %asi
143 subcc %o1, 1, %o1
144 bne,pt %icc, 1b
145 add %o0, 1, %o0
146 __clear_user_done:
147 retl
148 clr %o0
149 ENDPROC(__clear_user)
150 EXPORT_SYMBOL(__clear_user)
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