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1/***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id: ata-as-coldfire.S 17847 2008-06-28 18:10:04Z bagder $
9 *
10 * Copyright (C) 2006 by Jens Arnold
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
16 *
17 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 * KIND, either express or implied.
19 *
20 ****************************************************************************/
21
22 .section .icode,"ax",@progbits
23
24 .equ .ata_port, 0x20000020
25 .equ .swapmask, 0x00FF00FF
26
27 .align 2
28 .global copy_read_sectors
29 .type copy_read_sectors,@function
30
31/* Read a number of words from the ATA data port
32 *
33 * Utilises line bursts, assumes there is at least one full line to copy.
34 *
35 * Arguments:
36 * (4,%sp) - buffer address
37 * (8,%sp) - word count
38 *
39 * Register usage:
40 * %a0 - current address
41 * %a1 - end address
42 * %a2 - ata port
43 * %d0 - scratch
44 * %d1 - shift count
45 * %d2-%d6 - read buffers
46 *
47 * %d7 - byte swap scrach register
48 * %a3 - byte swap mask
49 */
50
51copy_read_sectors:
52 lea.l (-32, %sp), %sp
53 movem.l %d2-%d7/%a2-%a3, (%sp)
54 movem.l (36, %sp), %a0-%a1
55 add.l %a1, %a1
56 add.l %a0, %a1
57 lea.l .ata_port, %a2
58 lea.l .swapmask, %a3
59
60 move.l %a0, %d0
61 btst.l #0, %d0 /* 16-bit aligned? */
62 jeq .r_aligned /* yes, do word copy */
63
64 /* not 16-bit aligned */
65 subq.l #1, %a1 /* last byte is done unconditionally */
66 moveq.l #24, %d1 /* preload shift count */
67
68 move.w (%a2), %d2 /* load initial word */
69 move.b %d2, (%a0)+ /* write high byte of it, aligns dest addr */
70 /* we have byte swapped */
71
72 lsr.l #8, %d2
73 btst.l #1, %d0 /* longword aligned? (testing old d0 value!) */
74 bne.b .r_end_u_w1 /* yes, skip leading word handling */
75
76 move.w (%a2), %d3
77 move.l %d3, %d0
78 lsl.l #8, %d2
79 and.l #0xff, %d0
80 or.l %d0, %d2
81
82 move.w %d2, (%a0)+ /* write bytes 2 and 3 as word */
83 move.l %d3, %d2
84 lsr.l #8, %d2
85
86.r_end_u_w1:
87 moveq.l #12, %d0
88 add.l %a0, %d0
89 and.l #0xFFFFFFF0,%d0 /* d0 == first line bound */
90 cmp.l %a0, %d0 /* any leading longwords? */
91 bls.b .r_end_u_l1 /* no: skip loop */
92
93.r_loop_u_l1:
94 move.w (%a2), %d3 /* load first word */
95 swap %d3 /* move to upper 16 bit */
96 move.w (%a2), %d3 /* load second word */
97
98 /* byte swap d3 */
99 move.l %a3, %d7 /* d7 = 0x00FF00FF */
100 and.l %d3, %d7 /* d7 = .B.D */
101 eor.l %d7, %d3 /* d3 = A.C. */
102 lsl.l #8, %d7 /* d7 = B.D. */
103 lsr.l #8, %d3 /* d3 = .A.C */
104 or.l %d7, %d3 /* d3 = BADC */
105
106 move.l %d3, %d4
107
108 lsl.l %d1, %d2
109 lsr.l #8, %d3
110 or.l %d3, %d2 /* combine old low byte with new top 3 bytes */
111 move.l %d2, (%a0)+ /* store as long */
112 move.l %d4, %d2
113 cmp.l %a0, %d0 /* run up to first line bound */
114 bhi.b .r_loop_u_l1
115
116.r_end_u_l1:
117 lea.l (-14, %a1), %a1 /* adjust end addr. to 16 bytes/pass */
118
119.r_loop_u_line:
120 move.w (%a2), %d3 /* load 1st word */
121 swap %d3 /* move to upper 16 bit */
122 move.w (%a2), %d3 /* load 2nd word */
123
124 /* byte swap d3 */
125 move.l %a3, %d7 /* d7 = 0x00FF00FF */
126 and.l %d3, %d7 /* d7 = .B.D */
127 eor.l %d7, %d3 /* d3 = A.C. */
128 lsl.l #8, %d7 /* d7 = B.D. */
129 lsr.l #8, %d3 /* d3 = .A.C */
130 or.l %d7, %d3 /* d3 = BADC */
131
132 move.l %d3, %d0
133
134 lsl.l %d1, %d2
135 lsr.l #8, %d0
136 or.l %d0, %d2 /* combine old low byte with new top 3 bytes */
137 move.w (%a2), %d4 /* load 3rd word */
138 swap %d4 /* move to upper 16 bit */
139 move.w (%a2), %d4 /* load 4th word */
140
141 /* byte swap d4 */
142 move.l %a3, %d7 /* d7 = 0x00FF00FF */
143 and.l %d4, %d7 /* d7 = .B.D */
144 eor.l %d7, %d4 /* d4 = A.C. */
145 lsl.l #8, %d7 /* d7 = B.D. */
146 lsr.l #8, %d4 /* d4 = .A.C */
147 or.l %d7, %d4 /* d4 = BADC */
148
149 move.l %d4, %d0
150 lsl.l %d1, %d3
151 lsr.l #8, %d0
152 or.l %d0, %d3 /* combine old low byte with new top 3 bytes */
153 move.w (%a2), %d5 /* load 5th word */
154 swap %d5 /* move to upper 16 bit */
155 move.w (%a2), %d5 /* load 6th word */
156
157 /* byte swap d5 */
158 move.l %a3, %d7 /* d7 = 0x00FF00FF */
159 and.l %d5, %d7 /* d7 = .B.D */
160 eor.l %d7, %d5 /* d5 = A.C. */
161 lsl.l #8, %d7 /* d7 = B.D. */
162 lsr.l #8, %d5 /* d5 = .A.C */
163 or.l %d7, %d5 /* d5 = BADC */
164
165 move.l %d5, %d0
166 lsl.l %d1, %d4
167 lsr.l #8, %d0
168 or.l %d0, %d4 /* combine old low byte with new top 3 bytes */
169 move.w (%a2), %d6 /* load 7th word */
170 swap %d6 /* move to upper 16 bit */
171 move.w (%a2), %d6 /* load 8th word */
172
173 /* byte swap d6 */
174 move.l %a3, %d7 /* d7 = 0x00FF00FF */
175 and.l %d6, %d7 /* d7 = .B.D */
176 eor.l %d7, %d6 /* d6 = A.C. */
177 lsl.l #8, %d7 /* d7 = B.D. */
178 lsr.l #8, %d6 /* d6 = .A.C */
179 or.l %d7, %d6 /* d6 = BADC */
180
181 move.l %d6, %d0
182 lsl.l %d1, %d5
183 lsr.l #8, %d0
184 or.l %d0, %d5 /* combine old low byte with new top 3 bytes */
185 movem.l %d2-%d5, (%a0) /* store line */
186 lea.l (16, %a0), %a0
187 move.l %d6, %d2
188 cmp.l %a0, %a1 /* run up to last line bound */
189 bhi.b .r_loop_u_line
190
191 lea.l (12, %a1), %a1 /* readjust for longword loop */
192 cmp.l %a0, %a1 /* any trailing longwords? */
193 bls.b .r_end_u_l2 /* no: skip loop */
194
195.r_loop_u_l2:
196 move.w (%a2), %d3 /* load first word */
197 swap %d3 /* move to upper 16 bit */
198 move.w (%a2), %d3 /* load second word */
199
200 /* byte swap d3 */
201 move.l %a3, %d7 /* d7 = 0x00FF00FF */
202 and.l %d3, %d7 /* d7 = .B.D */
203 eor.l %d7, %d3 /* d3 = A.C. */
204 lsl.l #8, %d7 /* d7 = B.D. */
205 lsr.l #8, %d3 /* d3 = .A.C */
206 or.l %d7, %d3 /* d3 = BADC */
207
208 move.l %d3, %d4
209 lsl.l %d1, %d2
210 lsr.l #8, %d3
211 or.l %d3, %d2 /* combine old low byte with new top 3 bytes */
212 move.l %d2, (%a0)+ /* store as long */
213 move.l %d4, %d2
214 cmp.l %a0, %a1 /* run up to last long bound */
215 bhi.b .r_loop_u_l2
216
217.r_end_u_l2:
218 addq.l #2, %a1 /* back to final end address */
219 cmp.l %a0, %a1 /* one word left? */
220 bls.b .r_end_u_w2
221
222 move.w (%a2), %d3
223 move.l %d3, %d0
224 lsl.l #8, %d2
225 and.l #0xff, %d0
226 or.l %d0, %d2
227
228 move.w %d2, (%a0)+ /* write bytes 2 and 3 as word */
229
230 move.l %d3, %d2
231 lsr.l #8, %d2
232.r_end_u_w2:
233 move.b %d2, (%a0)+ /* store final byte */
234 bra.w .r_exit
235
236 /* 16-bit aligned */
237.r_aligned:
238 btst.l #1, %d0 /* longword aligned? */
239 beq.b .r_end_a_w1 /* yes, skip leading word handling */
240
241 /* copy initial word */
242 /* initial word has to be swapped */
243 move.w (%a2), %d7
244 move.b %d7, (%a0)+
245 lsr.l #8, %d7
246 move.b %d7, (%a0)+
247
248.r_end_a_w1:
249 moveq.l #12, %d0
250 add.l %a0, %d0
251 and.l #0xFFFFFFF0,%d0 /* d0 == first line bound */
252 cmp.l %a0, %d0 /* any leading longwords? */
253 bls.b .r_end_a_l1 /* no: skip loop */
254
255.r_loop_a_l1:
256 move.w (%a2), %d1 /* load first word */
257 swap %d1 /* move it to upper 16 bits */
258 move.w (%a2), %d1 /* load second word */
259
260 /* byte swap d1 */
261 move.l %a3, %d7 /* d7 = 0x00FF00FF */
262 and.l %d1, %d7 /* d7 = .B.D */
263 eor.l %d7, %d1 /* d1 = A.C. */
264 lsl.l #8, %d7 /* d7 = B.D. */
265 lsr.l #8, %d1 /* d1 = .A.C */
266 or.l %d7, %d1 /* d1 = BADC */
267
268 move.l %d1, (%a0)+ /* store as long */
269 cmp.l %a0, %d0 /* run up to first line bound */
270 bhi.b .r_loop_a_l1
271
272.r_end_a_l1:
273 lea.l (-14, %a1), %a1 /* adjust end addr. to 16 bytes/pass */
274
275.r_loop_a_line:
276 move.w (%a2), %d0 /* load 1st word */
277 swap %d0 /* move it to upper 16 bits */
278 move.w (%a2), %d0 /* load 2nd word */
279
280 /* byte swap d0 */
281 move.l %a3, %d7 /* d7 = 0x00FF00FF */
282 and.l %d0, %d7 /* d7 = .B.D */
283 eor.l %d7, %d0 /* d0 = A.C. */
284 lsl.l #8, %d7 /* d7 = B.D. */
285 lsr.l #8, %d0 /* d0 = .A.C */
286 or.l %d7, %d0 /* d0 = BADC */
287
288 move.w (%a2), %d1 /* load 3rd word */
289 swap %d1 /* move it to upper 16 bits */
290 move.w (%a2), %d1 /* load 4th word */
291
292 /* byte swap d1 */
293 move.l %a3, %d7 /* d7 = 0x00FF00FF */
294 and.l %d1, %d7 /* d7 = .B.D */
295 eor.l %d7, %d1 /* d1 = A.C. */
296 lsl.l #8, %d7 /* d7 = B.D. */
297 lsr.l #8, %d1 /* d1 = .A.C */
298 or.l %d7, %d1 /* d1 = BADC */
299
300 move.w (%a2), %d2 /* load 5th word */
301 swap %d2 /* move it to upper 16 bits */
302 move.w (%a2), %d2 /* load 6th word */
303
304 /* byte swap d2 */
305 move.l %a3, %d7 /* d7 = 0x00FF00FF */
306 and.l %d2, %d7 /* d7 = .B.D */
307 eor.l %d7, %d2 /* d2 = A.C. */
308 lsl.l #8, %d7 /* d7 = B.D. */
309 lsr.l #8, %d2 /* d2 = .A.C */
310 or.l %d7, %d2 /* d2 = BADC */
311
312 move.w (%a2), %d3 /* load 7th word */
313 swap %d3 /* move it to upper 16 bits */
314 move.w (%a2), %d3 /* load 8th word */
315
316 /* byte swap d3 */
317 move.l %a3, %d7 /* d7 = 0x00FF00FF */
318 and.l %d3, %d7 /* d7 = .B.D */
319 eor.l %d7, %d3 /* d3 = A.C. */
320 lsl.l #8, %d7 /* d7 = B.D. */
321 lsr.l #8, %d3 /* d3 = .A.C */
322 or.l %d7, %d3 /* d3 = BADC */
323
324 movem.l %d0-%d3, (%a0) /* store line */
325 lea.l (16, %a0), %a0
326 cmp.l %a0, %a1 /* run up to last line bound */
327 bhi.b .r_loop_a_line
328
329 lea.l (12, %a1), %a1 /* readjust for longword loop */
330 cmp.l %a0, %a1 /* any trailing longwords? */
331 bls.b .r_end_a_l2 /* no: skip loop */
332
333.r_loop_a_l2:
334 move.w (%a2), %d1 /* read first word */
335 swap %d1 /* move it to upper 16 bits */
336 move.w (%a2), %d1 /* read second word */
337
338 /* byte swap d1 */
339 move.l %a3, %d7 /* d7 = 0x00FF00FF */
340 and.l %d1, %d7 /* d7 = .B.D */
341 eor.l %d7, %d1 /* d1 = A.C. */
342 lsl.l #8, %d7 /* d7 = B.D. */
343 lsr.l #8, %d1 /* d1 = .A.C */
344 or.l %d7, %d1 /* d1 = BADC */
345
346 move.l %d1, (%a0)+ /* store as long */
347 cmp.l %a0, %a1 /* run up to last long bound */
348 bhi.b .r_loop_a_l2
349
350.r_end_a_l2:
351 addq.l #2, %a1 /* back to final end address */
352 cmp.l %a0, %a1 /* one word left? */
353 bls.b .r_end_a_w2
354
355 /* copy final word */
356 /* final word has to be swapped */
357 move.w (%a2), %d7
358 move.b %d7, (%a0)+
359 lsr.l #8, %d7
360 move.b %d7, (%a0)+
361
362.r_end_a_w2:
363
364.r_exit:
365 movem.l (%sp), %d2-%d7/%a2-%a3
366 lea.l (32, %sp), %sp
367 rts
368
369.r_end:
370 .size copy_read_sectors,.r_end-copy_read_sectors
371
372 .align 2
373 .global copy_write_sectors
374 .type copy_write_sectors,@function
375
376/* Write a number of words to the ATA data port
377 *
378 * Utilises line bursts, assumes there is at least one full line to copy.
379 *
380 * Arguments:
381 * (4,%sp) - buffer address
382 * (8,%sp) - word count
383 *
384 * Register usage:
385 * %a0 - current address
386 * %a1 - end address
387 * %a2 - ata port
388 * %d0 - scratch
389 * %d1 - shift count
390 * %d2-%d6 - read buffers
391 *
392 * %d7 - swap scrach
393 * %a3 - swap mask
394 */
395
396copy_write_sectors:
397 lea.l (-32, %sp), %sp
398 movem.l %d2-%d7/%a2-%a3, (%sp)
399 movem.l (36, %sp), %a0-%a1
400 add.l %a1, %a1
401 add.l %a0, %a1
402 lea.l .ata_port, %a2
403 lea.l .swapmask, %a3
404
405 move.l %a0, %d0
406 btst.l #0, %d0 /* 16-bit aligned? */
407 beq .w_aligned /* yes, do word copy */
408
409 /* not 16-bit aligned */
410 subq.l #1, %a1 /* last byte is done unconditionally */
411 moveq.l #24, %d1 /* preload shift count */
412
413 move.b (%a0)+, %d2
414
415 btst.l #1, %d0 /* longword aligned? (testing old d0 value!) */
416 bne.b .w_end_u_w1 /* yes, skip leading word handling */
417
418 swap %d2
419 move.w (%a0)+, %d2
420 move.l %d2, %d3
421 lsr.l #8, %d3
422
423 /* low word of %d3 has to be byte swaped */
424 move.l %a3, %d7 /* d7 = 0x00FF00FF */
425 and.l %d3, %d7 /* d7 = .B.D */
426 eor.l %d7, %d3 /* d3 = A.C. */
427 lsl.l #8, %d7 /* d7 = B.D. */
428 lsr.l #8, %d3 /* d3 = .A.C */
429 or.l %d7, %d3 /* d3 = BADC */
430
431 move.w %d3, (%a2)
432
433.w_end_u_w1:
434 moveq.l #12, %d0
435 add.l %a0, %d0
436 and.l #0xFFFFFFF0,%d0 /* d0 == first line bound */
437 cmp.l %a0, %d0 /* any leading longwords? */
438 bls.b .w_end_u_l1 /* no: skip loop */
439
440.w_loop_u_l1:
441 move.l (%a0)+, %d3
442 move.l %d3, %d4
443 lsl.l %d1, %d2
444 lsr.l #8, %d3
445 or.l %d3, %d2
446
447 /* byte swap d2 */
448 move.l %a3, %d7 /* d7 = 0x00FF00FF */
449 and.l %d2, %d7 /* d7 = .B.D */
450 eor.l %d7, %d2 /* d2 = A.C. */
451 lsl.l #8, %d7 /* d7 = B.D. */
452 lsr.l #8, %d2 /* d2 = .A.C */
453 or.l %d7, %d2 /* d2 = BADC */
454
455 swap %d2
456 move.w %d2, (%a2)
457 swap %d2
458 move.w %d2, (%a2)
459 move.l %d4, %d2
460 cmp.l %a0, %d0 /* run up to first line bound */
461 bhi.b .w_loop_u_l1
462
463.w_end_u_l1:
464 lea.l (-14, %a1), %a1 /* adjust end addr. to 16 bytes/pass */
465
466.w_loop_u_line:
467 movem.l (%a0), %d3-%d6
468 lea.l (16, %a0), %a0
469 move.l %d3, %d0
470 lsl.l %d1, %d2
471 lsr.l #8, %d0
472 or.l %d0, %d2
473
474 /* byte swap d2 */
475 move.l %a3, %d7 /* d7 = 0x00FF00FF */
476 and.l %d2, %d7 /* d7 = .B.D */
477 eor.l %d7, %d2 /* d2 = A.C. */
478 lsl.l #8, %d7 /* d7 = B.D. */
479 lsr.l #8, %d2 /* d2 = .A.C */
480 or.l %d7, %d2 /* d2 = BADC */
481
482 swap %d2
483 move.w %d2, (%a2)
484 swap %d2
485 move.w %d2, (%a2)
486 move.l %d4, %d0
487 lsl.l %d1, %d3
488 lsr.l #8, %d0
489 or.l %d0, %d3
490
491 /* byte swap d3 */
492 move.l %a3, %d7 /* d7 = 0x00FF00FF */
493 and.l %d3, %d7 /* d7 = .B.D */
494 eor.l %d7, %d3 /* d3 = A.C. */
495 lsl.l #8, %d7 /* d7 = B.D. */
496 lsr.l #8, %d3 /* d3 = .A.C */
497 or.l %d7, %d3 /* d3 = BADC */
498
499 swap %d3
500 move.w %d3, (%a2)
501 swap %d3
502 move.w %d3, (%a2)
503 move.l %d5, %d0
504 lsl.l %d1, %d4
505 lsr.l #8, %d0
506 or.l %d0, %d4
507
508 /* byte swap d4 */
509 move.l %a3, %d7 /* d7 = 0x00FF00FF */
510 and.l %d4, %d7 /* d7 = .B.D */
511 eor.l %d7, %d4 /* d4 = A.C. */
512 lsl.l #8, %d7 /* d7 = B.D. */
513 lsr.l #8, %d4 /* d4 = .A.C */
514 or.l %d7, %d4 /* d4 = BADC */
515
516 swap %d4
517 move.w %d4, (%a2)
518 swap %d4
519 move.w %d4, (%a2)
520 move.l %d6, %d0
521 lsl.l %d1, %d5
522 lsr.l #8, %d0
523 or.l %d0, %d5
524
525 /* byte swap d5 */
526 move.l %a3, %d7 /* d7 = 0x00FF00FF */
527 and.l %d5, %d7 /* d7 = .B.D */
528 eor.l %d7, %d5 /* d5 = A.C. */
529 lsl.l #8, %d7 /* d7 = B.D. */
530 lsr.l #8, %d5 /* d5 = .A.C */
531 or.l %d7, %d5 /* d5 = BADC */
532
533 swap %d5
534 move.w %d5, (%a2)
535 swap %d5
536 move.w %d5, (%a2)
537 move.l %d6, %d2
538 cmp.l %a0, %a1 /* run up to last line bound */
539 bhi.b .w_loop_u_line
540
541 lea.l (12, %a1), %a1 /* readjust for longword loop */
542 cmp.l %a0, %a1 /* any trailing longwords? */
543 bls.b .w_end_u_l2 /* no: skip loop */
544
545.w_loop_u_l2:
546 move.l (%a0)+, %d3
547 move.l %d3, %d4
548 lsl.l %d1, %d2
549 lsr.l #8, %d3
550 or.l %d3, %d2
551
552 /* byte swap d2 */
553 move.l %a3, %d7 /* d7 = 0x00FF00FF */
554 and.l %d2, %d7 /* d7 = .B.D */
555 eor.l %d7, %d2 /* d2 = A.C. */
556 lsl.l #8, %d7 /* d7 = B.D. */
557 lsr.l #8, %d2 /* d2 = .A.C */
558 or.l %d7, %d2 /* d2 = BADC */
559
560 swap %d2
561 move.w %d2, (%a2)
562 swap %d2
563 move.w %d2, (%a2)
564 move.l %d4, %d2
565 cmp.l %a0, %a1 /* run up to first line bound */
566 bhi.b .w_loop_u_l2
567
568.w_end_u_l2:
569 addq.l #2, %a1 /* back to final end address */
570 cmp.l %a0, %a1 /* one word left? */
571 bls.b .w_end_u_w2
572
573 swap %d2
574 move.w (%a0)+, %d2
575 move.l %d2, %d3
576 lsr.l #8, %d3
577
578 /* byte swap d3 */
579 move.l %a3, %d7 /* d7 = 0x00FF00FF */
580 and.l %d3, %d7 /* d7 = .B.D */
581 eor.l %d7, %d3 /* d3 = A.C. */
582 lsl.l #8, %d7 /* d7 = B.D. */
583 lsr.l #8, %d3 /* d3 = .A.C */
584 or.l %d7, %d3 /* d3 = BADC */
585
586 move.w %d3, (%a2)
587
588.w_end_u_w2:
589 lsl.l #8, %d2
590 move.b (%a0)+, %d2
591
592 /* byte swap d2 */
593 move.l %a3, %d7 /* d7 = 0x00FF00FF */
594 and.l %d2, %d7 /* d7 = .B.D */
595 eor.l %d7, %d2 /* d2 = A.C. */
596 lsl.l #8, %d7 /* d7 = B.D. */
597 lsr.l #8, %d2 /* d2 = .A.C */
598 or.l %d7, %d2 /* d2 = BADC */
599
600 move.w %d2, (%a2)
601 bra.w .w_exit
602
603 /* 16-bit aligned */
604.w_aligned:
605 btst.l #1, %d0
606 beq.b .w_end_a_w1
607
608 /* this has to be byte swaped */
609 /* copy initial word */
610 move.w (%a0)+, %d1
611
612 /* byte swap d1 */
613 move.l %a3, %d7 /* d7 = $00FF00FF */
614 and.l %d1, %d7 /* d7 = .B.D */
615 eor.l %d7, %d1 /* d1 = A.C. */
616 lsl.l #8, %d7 /* d7 = B.D. */
617 lsr.l #8, %d1 /* d1 = .A.C */
618 or.l %d7, %d1 /* d1 = BADC */
619
620 move.w %d1, (%a2)
621
622
623.w_end_a_w1:
624 moveq.l #12, %d0
625 add.l %a0, %d0
626 and.l #0xFFFFFFF0,%d0 /* d0 == first line bound */
627 cmp.l %a0, %d0 /* any leading longwords? */
628 bls.b .w_end_a_l1 /* no: skip loop */
629
630.w_loop_a_l1:
631 move.l (%a0)+, %d1
632
633/* byte swap d1 */
634 move.l %a3, %d7 /* d7 = 0x00FF00FF */
635 and.l %d1, %d7 /* d7 = .B.D */
636 eor.l %d7, %d1 /* d1 = A.C. */
637 lsl.l #8, %d7 /* d7 = B.D. */
638 lsr.l #8, %d1 /* d1 = .A.C */
639 or.l %d7, %d1 /* d1 = BADC */
640
641 swap %d1
642 move.w %d1, (%a2)
643 swap %d1
644 move.w %d1, (%a2)
645 cmp.l %a0, %d0 /* run up to first line bound */
646 bhi.b .w_loop_a_l1
647
648.w_end_a_l1:
649 lea.l (-14, %a1), %a1 /* adjust end addr. to 16 bytes/pass */
650
651.w_loop_a_line:
652 movem.l (%a0), %d0-%d3
653
654/* byte swap d0-d3 */
655 move.l %a3, %d7 /* d7 = 0x00FF00FF */
656 and.l %d0, %d7 /* d7 = .B.D */
657 eor.l %d7, %d0 /* d0 = A.C. */
658 lsl.l #8, %d7 /* d7 = B.D. */
659 lsr.l #8, %d0 /* d0 = .A.C */
660 or.l %d7, %d0 /* d0 = BADC */
661
662 move.l %a3, %d7 /* d7 = 0x00FF00FF */
663 and.l %d1, %d7 /* d7 = .B.D */
664 eor.l %d7, %d1 /* d1 = A.C. */
665 lsl.l #8, %d7 /* d7 = B.D. */
666 lsr.l #8, %d1 /* d1 = .A.C */
667 or.l %d7, %d1 /* d1 = BADC */
668
669 move.l %a3, %d7 /* d7 = 0x00FF00FF */
670 and.l %d2, %d7 /* d7 = .B.D */
671 eor.l %d7, %d2 /* d2 = A.C. */
672 lsl.l #8, %d7 /* d7 = B.D. */
673 lsr.l #8, %d2 /* d2 = .A.C */
674 or.l %d7, %d2 /* d2 = BADC */
675
676 move.l %a3, %d7 /* d7 = 0x00FF00FF */
677 and.l %d3, %d7 /* d7 = .B.D */
678 eor.l %d7, %d3 /* d3 = A.C. */
679 lsl.l #8, %d7 /* d7 = B.D. */
680 lsr.l #8, %d3 /* d3 = .A.C */
681 or.l %d7, %d3 /* d3 = BADC */
682
683 lea.l (16, %a0), %a0
684 swap %d0
685 move.w %d0, (%a2)
686 swap %d0
687 move.w %d0, (%a2)
688 swap %d1
689 move.w %d1, (%a2)
690 swap %d1
691 move.w %d1, (%a2)
692 swap %d2
693 move.w %d2, (%a2)
694 swap %d2
695 move.w %d2, (%a2)
696 swap %d3
697 move.w %d3, (%a2)
698 swap %d3
699 move.w %d3, (%a2)
700 cmp.l %a0, %a1 /* run up to last line bound */
701 bhi.b .w_loop_a_line
702
703 lea.l (12, %a1), %a1 /* readjust for longword loop */
704 cmp.l %a0, %a1 /* any trailing longwords? */
705 bls.b .w_end_a_l2 /* no: skip loop */
706
707.w_loop_a_l2:
708 move.l (%a0)+, %d1
709
710/* byte swap d1 */
711 move.l %a3, %d7 /* d7 = 0x00FF00FF */
712 and.l %d1, %d7 /* d7 = .B.D */
713 eor.l %d7, %d1 /* d1 = A.C. */
714 lsl.l #8, %d7 /* d7 = B.D. */
715 lsr.l #8, %d1 /* d1 = .A.C */
716 or.l %d7, %d1 /* d1 = BADC */
717
718 swap %d1
719 move.w %d1, (%a2)
720 swap %d1
721 move.w %d1, (%a2)
722 cmp.l %a0, %a1 /* run up to first line bound */
723 bhi.b .w_loop_a_l2
724
725.w_end_a_l2:
726 addq.l #2, %a1 /* back to final end address */
727 cmp.l %a0, %a1 /* one word left? */
728 bls.b .w_end_a_w2
729
730/* this has to be byte swaped */
731/* copy final word */
732 move.w (%a0)+, %d0
733 move.l %a3, %d7
734 and.l %d0, %d7
735 eor.l %d7, %d0
736 lsl.l #8, %d7
737 lsr.l #8, %d0
738 or.l %d7, %d0
739 move.w %d0, (%a2)
740
741.w_end_a_w2:
742
743.w_exit:
744 movem.l (%sp), %d2-%d7/%a2-%a3
745 lea.l (32, %sp), %sp
746 rts
747
748.w_end:
749 .size copy_write_sectors,.w_end-copy_write_sectors
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 14:26:17 +0000