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1da177e4 LT |
1 | /* bzero.S: Simple prefetching memset, bzero, and clear_user |
2 | * implementations. | |
3 | * | |
4 | * Copyright (C) 2005 David S. Miller <davem@davemloft.net> | |
5 | */ | |
6 | ||
7 | .text | |
8 | ||
9 | .globl __memset | |
10 | .type __memset, #function | |
11 | __memset: /* %o0=buf, %o1=pat, %o2=len */ | |
12 | ||
13 | .globl memset | |
14 | .type memset, #function | |
15 | memset: /* %o0=buf, %o1=pat, %o2=len */ | |
16 | and %o1, 0xff, %o3 | |
17 | mov %o2, %o1 | |
18 | sllx %o3, 8, %g1 | |
19 | or %g1, %o3, %o2 | |
20 | sllx %o2, 16, %g1 | |
21 | or %g1, %o2, %o2 | |
22 | sllx %o2, 32, %g1 | |
23 | ba,pt %xcc, 1f | |
24 | or %g1, %o2, %o2 | |
25 | ||
26 | .globl __bzero | |
27 | .type __bzero, #function | |
28 | __bzero: /* %o0=buf, %o1=len */ | |
29 | clr %o2 | |
30 | 1: mov %o0, %o3 | |
31 | brz,pn %o1, __bzero_done | |
32 | cmp %o1, 16 | |
33 | bl,pn %icc, __bzero_tiny | |
34 | prefetch [%o0 + 0x000], #n_writes | |
35 | andcc %o0, 0x3, %g0 | |
36 | be,pt %icc, 2f | |
37 | 1: stb %o2, [%o0 + 0x00] | |
38 | add %o0, 1, %o0 | |
39 | andcc %o0, 0x3, %g0 | |
40 | bne,pn %icc, 1b | |
41 | sub %o1, 1, %o1 | |
42 | 2: andcc %o0, 0x7, %g0 | |
43 | be,pt %icc, 3f | |
44 | stw %o2, [%o0 + 0x00] | |
45 | sub %o1, 4, %o1 | |
46 | add %o0, 4, %o0 | |
47 | 3: and %o1, 0x38, %g1 | |
48 | cmp %o1, 0x40 | |
49 | andn %o1, 0x3f, %o4 | |
50 | bl,pn %icc, 5f | |
51 | and %o1, 0x7, %o1 | |
52 | prefetch [%o0 + 0x040], #n_writes | |
53 | prefetch [%o0 + 0x080], #n_writes | |
54 | prefetch [%o0 + 0x0c0], #n_writes | |
55 | prefetch [%o0 + 0x100], #n_writes | |
56 | prefetch [%o0 + 0x140], #n_writes | |
57 | 4: prefetch [%o0 + 0x180], #n_writes | |
58 | stx %o2, [%o0 + 0x00] | |
59 | stx %o2, [%o0 + 0x08] | |
60 | stx %o2, [%o0 + 0x10] | |
61 | stx %o2, [%o0 + 0x18] | |
62 | stx %o2, [%o0 + 0x20] | |
63 | stx %o2, [%o0 + 0x28] | |
64 | stx %o2, [%o0 + 0x30] | |
65 | stx %o2, [%o0 + 0x38] | |
66 | subcc %o4, 0x40, %o4 | |
67 | bne,pt %icc, 4b | |
68 | add %o0, 0x40, %o0 | |
69 | brz,pn %g1, 6f | |
70 | nop | |
71 | 5: stx %o2, [%o0 + 0x00] | |
72 | subcc %g1, 8, %g1 | |
73 | bne,pt %icc, 5b | |
74 | add %o0, 0x8, %o0 | |
75 | 6: brz,pt %o1, __bzero_done | |
76 | nop | |
77 | __bzero_tiny: | |
78 | 1: stb %o2, [%o0 + 0x00] | |
79 | subcc %o1, 1, %o1 | |
80 | bne,pt %icc, 1b | |
81 | add %o0, 1, %o0 | |
82 | __bzero_done: | |
83 | retl | |
84 | mov %o3, %o0 | |
85 | .size __bzero, .-__bzero | |
86 | .size __memset, .-__memset | |
87 | .size memset, .-memset | |
88 | ||
89 | #define EX_ST(x,y) \ | |
90 | 98: x,y; \ | |
91 | .section .fixup; \ | |
92 | .align 4; \ | |
93 | 99: retl; \ | |
94 | mov %o1, %o0; \ | |
4d000d5b | 95 | .section __ex_table,"a";\ |
1da177e4 LT |
96 | .align 4; \ |
97 | .word 98b, 99b; \ | |
98 | .text; \ | |
99 | .align 4; | |
100 | ||
c857e3fd DM |
101 | .globl __clear_user |
102 | .type __clear_user, #function | |
103 | __clear_user: /* %o0=buf, %o1=len */ | |
104 | brz,pn %o1, __clear_user_done | |
1da177e4 | 105 | cmp %o1, 16 |
c857e3fd | 106 | bl,pn %icc, __clear_user_tiny |
1da177e4 LT |
107 | EX_ST(prefetcha [%o0 + 0x00] %asi, #n_writes) |
108 | andcc %o0, 0x3, %g0 | |
109 | be,pt %icc, 2f | |
110 | 1: EX_ST(stba %g0, [%o0 + 0x00] %asi) | |
111 | add %o0, 1, %o0 | |
112 | andcc %o0, 0x3, %g0 | |
113 | bne,pn %icc, 1b | |
114 | sub %o1, 1, %o1 | |
115 | 2: andcc %o0, 0x7, %g0 | |
116 | be,pt %icc, 3f | |
117 | EX_ST(stwa %g0, [%o0 + 0x00] %asi) | |
118 | sub %o1, 4, %o1 | |
119 | add %o0, 4, %o0 | |
120 | 3: and %o1, 0x38, %g1 | |
121 | cmp %o1, 0x40 | |
122 | andn %o1, 0x3f, %o4 | |
123 | bl,pn %icc, 5f | |
124 | and %o1, 0x7, %o1 | |
125 | EX_ST(prefetcha [%o0 + 0x040] %asi, #n_writes) | |
126 | EX_ST(prefetcha [%o0 + 0x080] %asi, #n_writes) | |
127 | EX_ST(prefetcha [%o0 + 0x0c0] %asi, #n_writes) | |
128 | EX_ST(prefetcha [%o0 + 0x100] %asi, #n_writes) | |
129 | EX_ST(prefetcha [%o0 + 0x140] %asi, #n_writes) | |
130 | 4: EX_ST(prefetcha [%o0 + 0x180] %asi, #n_writes) | |
131 | EX_ST(stxa %g0, [%o0 + 0x00] %asi) | |
132 | EX_ST(stxa %g0, [%o0 + 0x08] %asi) | |
133 | EX_ST(stxa %g0, [%o0 + 0x10] %asi) | |
134 | EX_ST(stxa %g0, [%o0 + 0x18] %asi) | |
135 | EX_ST(stxa %g0, [%o0 + 0x20] %asi) | |
136 | EX_ST(stxa %g0, [%o0 + 0x28] %asi) | |
137 | EX_ST(stxa %g0, [%o0 + 0x30] %asi) | |
138 | EX_ST(stxa %g0, [%o0 + 0x38] %asi) | |
139 | subcc %o4, 0x40, %o4 | |
140 | bne,pt %icc, 4b | |
141 | add %o0, 0x40, %o0 | |
142 | brz,pn %g1, 6f | |
143 | nop | |
144 | 5: EX_ST(stxa %g0, [%o0 + 0x00] %asi) | |
145 | subcc %g1, 8, %g1 | |
146 | bne,pt %icc, 5b | |
147 | add %o0, 0x8, %o0 | |
c857e3fd | 148 | 6: brz,pt %o1, __clear_user_done |
1da177e4 | 149 | nop |
c857e3fd | 150 | __clear_user_tiny: |
1da177e4 LT |
151 | 1: EX_ST(stba %g0, [%o0 + 0x00] %asi) |
152 | subcc %o1, 1, %o1 | |
153 | bne,pt %icc, 1b | |
154 | add %o0, 1, %o0 | |
c857e3fd | 155 | __clear_user_done: |
1da177e4 LT |
156 | retl |
157 | clr %o0 | |
c857e3fd | 158 | .size __clear_user, .-__clear_user |