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Merge tag 'clk-for-linus' of git://git.linaro.org/people/mturquette/linux
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / sh / lib / copy_page.S
CommitLineData
510c72ad 1/*
1da177e4
LT		 2 * copy_page, __copy_user_page, __copy_user implementation of SuperH
3 *
4 * Copyright (C) 2001 Niibe Yutaka & Kaz Kojima
5 * Copyright (C) 2002 Toshinobu Sugioka
510c72ad 6 * Copyright (C) 2006 Paul Mundt
1da177e4
LT		 7 */
8#include <linux/linkage.h>
510c72ad 9#include <asm/page.h>
1da177e4
LT		 10
11/*
379a95d1 12 * copy_page
1da177e4
LT		 13 * @to: P1 address
14 * @from: P1 address
15 *
379a95d1 16 * void copy_page(void *to, void *from)
1da177e4
LT		 17 */
18
19/*
20 * r0, r1, r2, r3, r4, r5, r6, r7 --- scratch
510c72ad 21 * r8 --- from + PAGE_SIZE
1da177e4
LT		 22 * r9 --- not used
23 * r10 --- to
24 * r11 --- from
25 */
379a95d1 26ENTRY(copy_page)
1da177e4
LT		 27 mov.l r8,@-r15
28 mov.l r10,@-r15
29 mov.l r11,@-r15
30 mov r4,r10
31 mov r5,r11
32 mov r5,r8
a2494b9b
PM		 33 mov #(PAGE_SIZE >> 10), r0
34 shll8 r0
35 shll2 r0
1da177e4
LT		 36 add r0,r8
37 !
381: mov.l @r11+,r0
39 mov.l @r11+,r1
40 mov.l @r11+,r2
41 mov.l @r11+,r3
42 mov.l @r11+,r4
43 mov.l @r11+,r5
44 mov.l @r11+,r6
45 mov.l @r11+,r7
5c0cbd74 46#if defined(CONFIG_CPU_SH4)
1da177e4 47 movca.l r0,@r10
5c0cbd74
PM		 48#else
49 mov.l r0,@r10
1da177e4
LT		 50#endif
51 add #32,r10
52 mov.l r7,@-r10
53 mov.l r6,@-r10
54 mov.l r5,@-r10
55 mov.l r4,@-r10
56 mov.l r3,@-r10
57 mov.l r2,@-r10
58 mov.l r1,@-r10
1da177e4
LT		 59 cmp/eq r11,r8
60 bf/s 1b
61 add #28,r10
62 !
63 mov.l @r15+,r11
64 mov.l @r15+,r10
65 mov.l @r15+,r8
66 rts
67 nop
68
1da177e4
LT		 69/*
70 * __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
71 * Return the number of bytes NOT copied
72 */
73#define EX(...) \
74 9999: __VA_ARGS__ ; \
75 .section __ex_table, "a"; \
76 .long 9999b, 6000f ; \
77 .previous
5d52013c
SM		 78#define EX_NO_POP(...) \
79 9999: __VA_ARGS__ ; \
80 .section __ex_table, "a"; \
81 .long 9999b, 6005f ; \
82 .previous
1da177e4 83ENTRY(__copy_user)
023ef184
SM		 84 ! Check if small number of bytes
85 mov #11,r0
1da177e4 86 mov r4,r3
023ef184
SM		 87 cmp/gt r0,r6 ! r6 (len) > r0 (11)
88 bf/s .L_cleanup_loop_no_pop
89 add r6,r3 ! last destination address
90
91 ! Calculate bytes needed to align to src
92 mov.l r11,@-r15
93 neg r5,r0
94 mov.l r10,@-r15
1da177e4 95 add #4,r0
023ef184 96 mov.l r9,@-r15
1da177e4 97 and #3,r0
023ef184 98 mov.l r8,@-r15
1da177e4 99 tst r0,r0
023ef184 100 bt 2f
1da177e4 101
023ef184
SM		 1021:
103 ! Copy bytes to long word align src
104EX( mov.b @r5+,r1 )
105 dt r0
1da177e4 106 add #-1,r6
023ef184
SM		 107EX( mov.b r1,@r4 )
108 bf/s 1b
1da177e4
LT		 109 add #1,r4
110
023ef184
SM		 111 ! Jump to appropriate routine depending on dest
1122: mov #3,r1
113 mov r6, r2
114 and r4,r1
1da177e4 115 shlr2 r2
1da177e4
LT		 116 shll2 r1
117 mova .L_jump_tbl,r0
118 mov.l @(r0,r1),r1
119 jmp @r1
120 nop
121
122 .align 2
123.L_jump_tbl:
124 .long .L_dest00
125 .long .L_dest01
126 .long .L_dest10
127 .long .L_dest11
128
023ef184
SM		 129/*
130 * Come here if there are less than 12 bytes to copy
131 *
132 * Keep the branch target close, so the bf/s callee doesn't overflow
133 * and result in a more expensive branch being inserted. This is the
134 * fast-path for small copies, the jump via the jump table will hit the
135 * default slow-path cleanup. -PFM.
136 */
137.L_cleanup_loop_no_pop:
138 tst r6,r6 ! Check explicitly for zero
139 bt 1f
140
1412:
5d52013c 142EX_NO_POP( mov.b @r5+,r0 )
023ef184 143 dt r6
5d52013c 144EX_NO_POP( mov.b r0,@r4 )
023ef184
SM		 145 bf/s 2b
146 add #1,r4
147
1481: mov #0,r0 ! normal return
1495000:
150
151# Exception handler:
152.section .fixup, "ax"
5d52013c 1536005:
023ef184
SM		 154 mov.l 8000f,r1
155 mov r3,r0
156 jmp @r1
157 sub r4,r0
158 .align 2
1598000: .long 5000b
160
161.previous
162 rts
163 nop
164
1da177e4
LT		 165! Destination = 00
166
167.L_dest00:
023ef184
SM		 168 ! Skip the large copy for small transfers
169 mov #(32+32-4), r0
170 cmp/gt r6, r0 ! r0 (60) > r6 (len)
171 bt 1f
172
173 ! Align dest to a 32 byte boundary
174 neg r4,r0
175 add #0x20, r0
176 and #0x1f, r0
177 tst r0, r0
178 bt 2f
179
180 sub r0, r6
181 shlr2 r0
1823:
183EX( mov.l @r5+,r1 )
184 dt r0
185EX( mov.l r1,@r4 )
186 bf/s 3b
187 add #4,r4
188
1da177e4
LT		 1892:
190EX( mov.l @r5+,r0 )
023ef184
SM		 191EX( mov.l @r5+,r1 )
192EX( mov.l @r5+,r2 )
193EX( mov.l @r5+,r7 )
1da177e4
LT		 194EX( mov.l @r5+,r8 )
195EX( mov.l @r5+,r9 )
196EX( mov.l @r5+,r10 )
023ef184 197EX( mov.l @r5+,r11 )
0e670685 198#ifdef CONFIG_CPU_SH4
023ef184 199EX( movca.l r0,@r4 )
0e670685
SM		 200#else
201EX( mov.l r0,@r4 )
202#endif
023ef184
SM		 203 add #-32, r6
204EX( mov.l r1,@(4,r4) )
205 mov #32, r0
206EX( mov.l r2,@(8,r4) )
207 cmp/gt r6, r0 ! r0 (32) > r6 (len)
208EX( mov.l r7,@(12,r4) )
209EX( mov.l r8,@(16,r4) )
210EX( mov.l r9,@(20,r4) )
211EX( mov.l r10,@(24,r4) )
212EX( mov.l r11,@(28,r4) )
1da177e4
LT		 213 bf/s 2b
214 add #32,r4
023ef184
SM		 215
2161: mov r6, r0
217 shlr2 r0
218 tst r0, r0
1da177e4
LT		 219 bt .L_cleanup
2201:
023ef184
SM		 221EX( mov.l @r5+,r1 )
222 dt r0
223EX( mov.l r1,@r4 )
1da177e4
LT		 224 bf/s 1b
225 add #4,r4
226
227 bra .L_cleanup
228 nop
229
230! Destination = 10
231
232.L_dest10:
233 mov r2,r7
234 shlr2 r7
235 shlr r7
236 tst r7,r7
237 mov #7,r0
238 bt/s 1f
239 and r0,r2
2402:
241 dt r7
023ef184 242#ifdef CONFIG_CPU_LITTLE_ENDIAN
1da177e4
LT		 243EX( mov.l @r5+,r0 )
244EX( mov.l @r5+,r1 )
245EX( mov.l @r5+,r8 )
246EX( mov.l @r5+,r9 )
247EX( mov.l @r5+,r10 )
248EX( mov.w r0,@r4 )
249 add #2,r4
250 xtrct r1,r0
251 xtrct r8,r1
252 xtrct r9,r8
253 xtrct r10,r9
254
255EX( mov.l r0,@r4 )
256EX( mov.l r1,@(4,r4) )
257EX( mov.l r8,@(8,r4) )
258EX( mov.l r9,@(12,r4) )
259
260EX( mov.l @r5+,r1 )
261EX( mov.l @r5+,r8 )
262EX( mov.l @r5+,r0 )
263 xtrct r1,r10
264 xtrct r8,r1
265 xtrct r0,r8
266 shlr16 r0
267EX( mov.l r10,@(16,r4) )
268EX( mov.l r1,@(20,r4) )
269EX( mov.l r8,@(24,r4) )
270EX( mov.w r0,@(28,r4) )
271 bf/s 2b
272 add #30,r4
273#else
274EX( mov.l @(28,r5),r0 )
275EX( mov.l @(24,r5),r8 )
276EX( mov.l @(20,r5),r9 )
277EX( mov.l @(16,r5),r10 )
278EX( mov.w r0,@(30,r4) )
279 add #-2,r4
280 xtrct r8,r0
281 xtrct r9,r8
282 xtrct r10,r9
283EX( mov.l r0,@(28,r4) )
284EX( mov.l r8,@(24,r4) )
285EX( mov.l r9,@(20,r4) )
286
287EX( mov.l @(12,r5),r0 )
288EX( mov.l @(8,r5),r8 )
289 xtrct r0,r10
290EX( mov.l @(4,r5),r9 )
291 mov.l r10,@(16,r4)
292EX( mov.l @r5,r10 )
293 xtrct r8,r0
294 xtrct r9,r8
295 xtrct r10,r9
296EX( mov.l r0,@(12,r4) )
297EX( mov.l r8,@(8,r4) )
298 swap.w r10,r0
299EX( mov.l r9,@(4,r4) )
300EX( mov.w r0,@(2,r4) )
301
302 add #32,r5
303 bf/s 2b
304 add #34,r4
305#endif
306 tst r2,r2
307 bt .L_cleanup
308
3091: ! Read longword, write two words per iteration
310EX( mov.l @r5+,r0 )
311 dt r2
023ef184 312#ifdef CONFIG_CPU_LITTLE_ENDIAN
1da177e4
LT		 313EX( mov.w r0,@r4 )
314 shlr16 r0
315EX( mov.w r0,@(2,r4) )
316#else
317EX( mov.w r0,@(2,r4) )
318 shlr16 r0
319EX( mov.w r0,@r4 )
320#endif
321 bf/s 1b
322 add #4,r4
323
324 bra .L_cleanup
325 nop
326
327! Destination = 01 or 11
328
329.L_dest01:
330.L_dest11:
331 ! Read longword, write byte, word, byte per iteration
332EX( mov.l @r5+,r0 )
333 dt r2
023ef184 334#ifdef CONFIG_CPU_LITTLE_ENDIAN
1da177e4
LT		 335EX( mov.b r0,@r4 )
336 shlr8 r0
337 add #1,r4
338EX( mov.w r0,@r4 )
339 shlr16 r0
340EX( mov.b r0,@(2,r4) )
341 bf/s .L_dest01
342 add #3,r4
343#else
344EX( mov.b r0,@(3,r4) )
345 shlr8 r0
346 swap.w r0,r7
347EX( mov.b r7,@r4 )
348 add #1,r4
349EX( mov.w r0,@r4 )
350 bf/s .L_dest01
351 add #3,r4
352#endif
353
354! Cleanup last few bytes
355.L_cleanup:
356 mov r6,r0
357 and #3,r0
358 tst r0,r0
359 bt .L_exit
360 mov r0,r6
361
362.L_cleanup_loop:
363EX( mov.b @r5+,r0 )
364 dt r6
365EX( mov.b r0,@r4 )
366 bf/s .L_cleanup_loop
367 add #1,r4
368
369.L_exit:
370 mov #0,r0 ! normal return
023ef184 371
1da177e4
LT		 3725000:
373
374# Exception handler:
375.section .fixup, "ax"
3766000:
377 mov.l 8000f,r1
378 mov r3,r0
379 jmp @r1
380 sub r4,r0
381 .align 2
3828000: .long 5000b
383
384.previous
385 mov.l @r15+,r8
386 mov.l @r15+,r9
023ef184 387 mov.l @r15+,r10
1da177e4 388 rts
023ef184 389 mov.l @r15+,r11
kernel source for telekom puls (alcatel/mediatek)