aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sparc/lib/GENbzero.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/lib/GENbzero.S')
-rw-r--r--arch/sparc/lib/GENbzero.S160
1 files changed, 160 insertions, 0 deletions
diff --git a/arch/sparc/lib/GENbzero.S b/arch/sparc/lib/GENbzero.S
new file mode 100644
index 000000000000..6a4f956a2f7a
--- /dev/null
+++ b/arch/sparc/lib/GENbzero.S
@@ -0,0 +1,160 @@
1/* GENbzero.S: Generic sparc64 memset/clear_user.
2 *
3 * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
4 */
5#include <asm/asi.h>
6
7#define EX_ST(x,y) \
898: x,y; \
9 .section .fixup; \
10 .align 4; \
1199: retl; \
12 mov %o1, %o0; \
13 .section __ex_table,"a";\
14 .align 4; \
15 .word 98b, 99b; \
16 .text; \
17 .align 4;
18
19 .align 32
20 .text
21
22 .globl GENmemset
23 .type GENmemset, #function
24GENmemset: /* %o0=buf, %o1=pat, %o2=len */
25 and %o1, 0xff, %o3
26 mov %o2, %o1
27 sllx %o3, 8, %g1
28 or %g1, %o3, %o2
29 sllx %o2, 16, %g1
30 or %g1, %o2, %o2
31 sllx %o2, 32, %g1
32 ba,pt %xcc, 1f
33 or %g1, %o2, %o2
34
35 .globl GENbzero
36 .type GENbzero, #function
37GENbzero:
38 clr %o2
391: brz,pn %o1, GENbzero_return
40 mov %o0, %o3
41
42 /* %o5: saved %asi, restored at GENbzero_done
43 * %o4: store %asi to use
44 */
45 rd %asi, %o5
46 mov ASI_P, %o4
47 wr %o4, 0x0, %asi
48
49GENbzero_from_clear_user:
50 cmp %o1, 15
51 bl,pn %icc, GENbzero_tiny
52 andcc %o0, 0x7, %g1
53 be,pt %xcc, 2f
54 mov 8, %g2
55 sub %g2, %g1, %g1
56 sub %o1, %g1, %o1
571: EX_ST(stba %o2, [%o0 + 0x00] %asi)
58 subcc %g1, 1, %g1
59 bne,pt %xcc, 1b
60 add %o0, 1, %o0
612: cmp %o1, 128
62 bl,pn %icc, GENbzero_medium
63 andcc %o0, (64 - 1), %g1
64 be,pt %xcc, GENbzero_pre_loop
65 mov 64, %g2
66 sub %g2, %g1, %g1
67 sub %o1, %g1, %o1
681: EX_ST(stxa %o2, [%o0 + 0x00] %asi)
69 subcc %g1, 8, %g1
70 bne,pt %xcc, 1b
71 add %o0, 8, %o0
72
73GENbzero_pre_loop:
74 andn %o1, (64 - 1), %g1
75 sub %o1, %g1, %o1
76GENbzero_loop:
77 EX_ST(stxa %o2, [%o0 + 0x00] %asi)
78 EX_ST(stxa %o2, [%o0 + 0x08] %asi)
79 EX_ST(stxa %o2, [%o0 + 0x10] %asi)
80 EX_ST(stxa %o2, [%o0 + 0x18] %asi)
81 EX_ST(stxa %o2, [%o0 + 0x20] %asi)
82 EX_ST(stxa %o2, [%o0 + 0x28] %asi)
83 EX_ST(stxa %o2, [%o0 + 0x30] %asi)
84 EX_ST(stxa %o2, [%o0 + 0x38] %asi)
85 subcc %g1, 64, %g1
86 bne,pt %xcc, GENbzero_loop
87 add %o0, 64, %o0
88
89 membar #Sync
90 wr %o4, 0x0, %asi
91 brz,pn %o1, GENbzero_done
92GENbzero_medium:
93 andncc %o1, 0x7, %g1
94 be,pn %xcc, 2f
95 sub %o1, %g1, %o1
961: EX_ST(stxa %o2, [%o0 + 0x00] %asi)
97 subcc %g1, 8, %g1
98 bne,pt %xcc, 1b
99 add %o0, 8, %o0
1002: brz,pt %o1, GENbzero_done
101 nop
102
103GENbzero_tiny:
1041: EX_ST(stba %o2, [%o0 + 0x00] %asi)
105 subcc %o1, 1, %o1
106 bne,pt %icc, 1b
107 add %o0, 1, %o0
108
109 /* fallthrough */
110
111GENbzero_done:
112 wr %o5, 0x0, %asi
113
114GENbzero_return:
115 retl
116 mov %o3, %o0
117 .size GENbzero, .-GENbzero
118 .size GENmemset, .-GENmemset
119
120 .globl GENclear_user
121 .type GENclear_user, #function
122GENclear_user: /* %o0=buf, %o1=len */
123 rd %asi, %o5
124 brz,pn %o1, GENbzero_done
125 clr %o3
126 cmp %o5, ASI_AIUS
127 bne,pn %icc, GENbzero
128 clr %o2
129 ba,pt %xcc, GENbzero_from_clear_user
130 mov ASI_AIUS, %o4
131 .size GENclear_user, .-GENclear_user
132
133#define BRANCH_ALWAYS 0x10680000
134#define NOP 0x01000000
135#define GEN_DO_PATCH(OLD, NEW) \
136 sethi %hi(NEW), %g1; \
137 or %g1, %lo(NEW), %g1; \
138 sethi %hi(OLD), %g2; \
139 or %g2, %lo(OLD), %g2; \
140 sub %g1, %g2, %g1; \
141 sethi %hi(BRANCH_ALWAYS), %g3; \
142 sll %g1, 11, %g1; \
143 srl %g1, 11 + 2, %g1; \
144 or %g3, %lo(BRANCH_ALWAYS), %g3; \
145 or %g3, %g1, %g3; \
146 stw %g3, [%g2]; \
147 sethi %hi(NOP), %g3; \
148 or %g3, %lo(NOP), %g3; \
149 stw %g3, [%g2 + 0x4]; \
150 flush %g2;
151
152 .globl generic_patch_bzero
153 .type generic_patch_bzero,#function
154generic_patch_bzero:
155 GEN_DO_PATCH(memset, GENmemset)
156 GEN_DO_PATCH(__bzero, GENbzero)
157 GEN_DO_PATCH(__clear_user, GENclear_user)
158 retl
159 nop
160 .size generic_patch_bzero,.-generic_patch_bzero