1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* csum_copy.S: Checksum+copy code for sparc64
3 *
4 * Copyright (C) 2005 David S. Miller <davem@da
5 */
6
7 #include <linux/export.h>
8
9 #ifdef __KERNEL__
10 #define GLOBAL_SPARE %g7
11 #else
12 #define GLOBAL_SPARE %g5
13 #endif
14
15 #ifndef EX_LD
16 #define EX_LD(x) x
17 #endif
18
19 #ifndef EX_ST
20 #define EX_ST(x) x
21 #endif
22
23 #ifndef EX_RETVAL
24 #define EX_RETVAL(x) x
25 #endif
26
27 #ifndef LOAD
28 #define LOAD(type,addr,dest) type [addr], d
29 #endif
30
31 #ifndef STORE
32 #define STORE(type,src,addr) type src, [add
33 #endif
34
35 #ifndef FUNC_NAME
36 #define FUNC_NAME csum_partial_copy_noch
37 #endif
38
39 .register %g2, #scratch
40 .register %g3, #scratch
41
42 .text
43
44 90:
45 /* We checked for zero length already,
46 * at least one byte.
47 */
48 be,pt %icc, 1f
49 nop
50 EX_LD(LOAD(ldub, %o0 + 0x00, %o4))
51 add %o0, 1, %o0
52 sub %o2, 1, %o2
53 EX_ST(STORE(stb, %o4, %o1 + 0x00))
54 add %o1, 1, %o1
55 1: andcc %o0, 0x2, %g0
56 be,pn %icc, 80f
57 cmp %o2, 2
58 blu,pn %icc, 60f
59 nop
60 EX_LD(LOAD(lduh, %o0 + 0x00, %o5))
61 add %o0, 2, %o0
62 sub %o2, 2, %o2
63 EX_ST(STORE(sth, %o5, %o1 + 0x00))
64 add %o1, 2, %o1
65 ba,pt %xcc, 80f
66 add %o5, %o4, %o4
67
68 .globl FUNC_NAME
69 .type FUNC_NAME,#function
70 EXPORT_SYMBOL(FUNC_NAME)
71 FUNC_NAME: /* %o0=src, %o1=dst, %
72 LOAD(prefetch, %o0 + 0x000, #n_reads)
73 xor %o0, %o1, %g1
74 mov -1, %o3
75 clr %o4
76 andcc %g1, 0x3, %g0
77 bne,pn %icc, 95f
78 LOAD(prefetch, %o0 + 0x040, #n_reads)
79
80 brz,pn %o2, 70f
81 andcc %o0, 0x3, %g0
82
83 /* We "remember" whether the lowest bi
84 * was set in GLOBAL_SPARE. Because i
85 * upper and lower 8 bit fields of the
86 */
87 bne,pn %icc, 90b
88 andcc %o0, 0x1, GLOBAL_SPARE
89
90 80:
91 LOAD(prefetch, %o0 + 0x080, #n_reads)
92 andncc %o2, 0x3f, %g3
93
94 LOAD(prefetch, %o0 + 0x0c0, #n_reads)
95 sub %o2, %g3, %o2
96 brz,pn %g3, 2f
97 LOAD(prefetch, %o0 + 0x100, #n_reads)
98
99 /* So that we don't need to use the no
100 * add-with-carry instructions we accu
101 * values into a 64-bit register. At
102 * loop we fold it down to 32-bits and
103 */
104 ba,pt %xcc, 1f
105 LOAD(prefetch, %o0 + 0x140, #n_reads)
106
107 .align 32
108 1: EX_LD(LOAD(lduw, %o0 + 0x00, %o5))
109 EX_LD(LOAD(lduw, %o0 + 0x04, %g1))
110 EX_LD(LOAD(lduw, %o0 + 0x08, %g2))
111 add %o4, %o5, %o4
112 EX_ST(STORE(stw, %o5, %o1 + 0x00))
113 EX_LD(LOAD(lduw, %o0 + 0x0c, %o5))
114 add %o4, %g1, %o4
115 EX_ST(STORE(stw, %g1, %o1 + 0x04))
116 EX_LD(LOAD(lduw, %o0 + 0x10, %g1))
117 add %o4, %g2, %o4
118 EX_ST(STORE(stw, %g2, %o1 + 0x08))
119 EX_LD(LOAD(lduw, %o0 + 0x14, %g2))
120 add %o4, %o5, %o4
121 EX_ST(STORE(stw, %o5, %o1 + 0x0c))
122 EX_LD(LOAD(lduw, %o0 + 0x18, %o5))
123 add %o4, %g1, %o4
124 EX_ST(STORE(stw, %g1, %o1 + 0x10))
125 EX_LD(LOAD(lduw, %o0 + 0x1c, %g1))
126 add %o4, %g2, %o4
127 EX_ST(STORE(stw, %g2, %o1 + 0x14))
128 EX_LD(LOAD(lduw, %o0 + 0x20, %g2))
129 add %o4, %o5, %o4
130 EX_ST(STORE(stw, %o5, %o1 + 0x18))
131 EX_LD(LOAD(lduw, %o0 + 0x24, %o5))
132 add %o4, %g1, %o4
133 EX_ST(STORE(stw, %g1, %o1 + 0x1c))
134 EX_LD(LOAD(lduw, %o0 + 0x28, %g1))
135 add %o4, %g2, %o4
136 EX_ST(STORE(stw, %g2, %o1 + 0x20))
137 EX_LD(LOAD(lduw, %o0 + 0x2c, %g2))
138 add %o4, %o5, %o4
139 EX_ST(STORE(stw, %o5, %o1 + 0x24))
140 EX_LD(LOAD(lduw, %o0 + 0x30, %o5))
141 add %o4, %g1, %o4
142 EX_ST(STORE(stw, %g1, %o1 + 0x28))
143 EX_LD(LOAD(lduw, %o0 + 0x34, %g1))
144 add %o4, %g2, %o4
145 EX_ST(STORE(stw, %g2, %o1 + 0x2c))
146 EX_LD(LOAD(lduw, %o0 + 0x38, %g2))
147 add %o4, %o5, %o4
148 EX_ST(STORE(stw, %o5, %o1 + 0x30))
149 EX_LD(LOAD(lduw, %o0 + 0x3c, %o5))
150 add %o4, %g1, %o4
151 EX_ST(STORE(stw, %g1, %o1 + 0x34))
152 LOAD(prefetch, %o0 + 0x180, #n_reads)
153 add %o4, %g2, %o4
154 EX_ST(STORE(stw, %g2, %o1 + 0x38))
155 subcc %g3, 0x40, %g3
156 add %o0, 0x40, %o0
157 add %o4, %o5, %o4
158 EX_ST(STORE(stw, %o5, %o1 + 0x3c))
159 bne,pt %icc, 1b
160 add %o1, 0x40, %o1
161
162 2: and %o2, 0x3c, %g3
163 brz,pn %g3, 2f
164 sub %o2, %g3, %o2
165 1: EX_LD(LOAD(lduw, %o0 + 0x00, %o5))
166 subcc %g3, 0x4, %g3
167 add %o0, 0x4, %o0
168 add %o4, %o5, %o4
169 EX_ST(STORE(stw, %o5, %o1 + 0x00))
170 bne,pt %icc, 1b
171 add %o1, 0x4, %o1
172
173 2:
174 /* fold 64-->32 */
175 srlx %o4, 32, %o5
176 srl %o4, 0, %o4
177 add %o4, %o5, %o4
178 srlx %o4, 32, %o5
179 srl %o4, 0, %o4
180 add %o4, %o5, %o4
181
182 /* fold 32-->16 */
183 sethi %hi(0xffff0000), %g1
184 srl %o4, 16, %o5
185 andn %o4, %g1, %g2
186 add %o5, %g2, %o4
187 srl %o4, 16, %o5
188 andn %o4, %g1, %g2
189 add %o5, %g2, %o4
190
191 60:
192 /* %o4 has the 16-bit sum we have calc
193 cmp %o2, 2
194 blu,pt %icc, 1f
195 nop
196 EX_LD(LOAD(lduh, %o0 + 0x00, %o5))
197 sub %o2, 2, %o2
198 add %o0, 2, %o0
199 add %o4, %o5, %o4
200 EX_ST(STORE(sth, %o5, %o1 + 0x00))
201 add %o1, 0x2, %o1
202 1: brz,pt %o2, 1f
203 nop
204 EX_LD(LOAD(ldub, %o0 + 0x00, %o5))
205 sub %o2, 1, %o2
206 add %o0, 1, %o0
207 EX_ST(STORE(stb, %o5, %o1 + 0x00))
208 sllx %o5, 8, %o5
209 add %o1, 1, %o1
210 add %o4, %o5, %o4
211 1:
212 /* fold 32-->16 */
213 sethi %hi(0xffff0000), %g1
214 srl %o4, 16, %o5
215 andn %o4, %g1, %g2
216 add %o5, %g2, %o4
217 srl %o4, 16, %o5
218 andn %o4, %g1, %g2
219 add %o5, %g2, %o4
220
221 1: brz,pt GLOBAL_SPARE, 1f
222 nop
223
224 /* We started with an odd byte, byte-s
225 srl %o4, 8, %o5
226 and %o4, 0xff, %g1
227 sll %g1, 8, %g1
228 or %o5, %g1, %o4
229
230 1: addcc %o3, %o4, %o3
231 addc %g0, %o3, %o3
232
233 70:
234 retl
235 srl %o3, 0, %o0
236
237 95: mov 0, GLOBAL_SPARE
238 brlez,pn %o2, 4f
239 andcc %o0, 1, %o5
240 be,a,pt %icc, 1f
241 srl %o2, 1, %g1
242 sub %o2, 1, %o2
243 EX_LD(LOAD(ldub, %o0, GLOBAL_SPARE))
244 add %o0, 1, %o0
245 EX_ST(STORE(stb, GLOBAL_SPARE, %o1))
246 srl %o2, 1, %g1
247 add %o1, 1, %o1
248 1: brz,a,pn %g1, 3f
249 andcc %o2, 1, %g0
250 andcc %o0, 2, %g0
251 be,a,pt %icc, 1f
252 srl %g1, 1, %g1
253 EX_LD(LOAD(lduh, %o0, %o4))
254 sub %o2, 2, %o2
255 srl %o4, 8, %g2
256 sub %g1, 1, %g1
257 EX_ST(STORE(stb, %g2, %o1))
258 add %o4, GLOBAL_SPARE, GLO
259 EX_ST(STORE(stb, %o4, %o1 + 1))
260 add %o0, 2, %o0
261 srl %g1, 1, %g1
262 add %o1, 2, %o1
263 1: brz,a,pn %g1, 2f
264 andcc %o2, 2, %g0
265 EX_LD(LOAD(lduw, %o0, %o4))
266 5: srl %o4, 24, %g2
267 srl %o4, 16, %g3
268 EX_ST(STORE(stb, %g2, %o1))
269 srl %o4, 8, %g2
270 EX_ST(STORE(stb, %g3, %o1 + 1))
271 add %o0, 4, %o0
272 EX_ST(STORE(stb, %g2, %o1 + 2))
273 addcc %o4, GLOBAL_SPARE, GLO
274 EX_ST(STORE(stb, %o4, %o1 + 3))
275 addc GLOBAL_SPARE, %g0, GLO
276 add %o1, 4, %o1
277 subcc %g1, 1, %g1
278 bne,a,pt %icc, 5b
279 EX_LD(LOAD(lduw, %o0, %o4))
280 sll GLOBAL_SPARE, 16, %g2
281 srl GLOBAL_SPARE, 16, GLOB
282 srl %g2, 16, %g2
283 andcc %o2, 2, %g0
284 add %g2, GLOBAL_SPARE, GLO
285 2: be,a,pt %icc, 3f
286 andcc %o2, 1, %g0
287 EX_LD(LOAD(lduh, %o0, %o4))
288 andcc %o2, 1, %g0
289 srl %o4, 8, %g2
290 add %o0, 2, %o0
291 EX_ST(STORE(stb, %g2, %o1))
292 add GLOBAL_SPARE, %o4, GLO
293 EX_ST(STORE(stb, %o4, %o1 + 1))
294 add %o1, 2, %o1
295 3: be,a,pt %icc, 1f
296 sll GLOBAL_SPARE, 16, %o4
297 EX_LD(LOAD(ldub, %o0, %g2))
298 sll %g2, 8, %o4
299 EX_ST(STORE(stb, %g2, %o1))
300 add GLOBAL_SPARE, %o4, GLO
301 sll GLOBAL_SPARE, 16, %o4
302 1: addcc %o4, GLOBAL_SPARE, GLO
303 srl GLOBAL_SPARE, 16, %o4
304 addc %g0, %o4, GLOBAL_SPARE
305 brz,pt %o5, 4f
306 srl GLOBAL_SPARE, 8, %o4
307 and GLOBAL_SPARE, 0xff, %g
308 and %o4, 0xff, %o4
309 sll %g2, 8, %g2
310 or %g2, %o4, GLOBAL_SPARE
311 4: addcc %o3, GLOBAL_SPARE, %o3
312 addc %g0, %o3, %o0
313 retl
314 srl %o0, 0, %o0
315 .size FUNC_NAME, .-FUNC_NAME
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