1 /* $NetBSD: bcopyinout_xscale.S,v 1.3 2003/12/15 09:27:18 scw Exp $ */
4 * Copyright 2003 Wasabi Systems, Inc.
7 * Written by Steve C. Woodford for Wasabi Systems, Inc.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed for the NetBSD Project by
20 * Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 * or promote products derived from this software without specific prior
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
38 #include <machine/asm.h>
39 __FBSDID("$FreeBSD$");
45 #define GET_PCB(tmp) \
46 mrc p15, 0, tmp, c13, c0, 4; \
47 add tmp, tmp, #(TD_PCB)
50 * r0 = user space address
51 * r1 = kernel space address
54 * Copies bytes from user space to kernel space
59 movle pc, lr /* Bail early if length is <= 0 */
65 ldr r12, =(VM_MAXUSER_ADDRESS + 1)
74 ldr r3, .L_min_memcpy_size
78 stmfd sp!, {r0-r2, r4, lr}
82 mov r3, #2 /* SRC_IS_USER */
87 ldmfd sp!, {r0-r2, r4, lr}
92 stmfd sp!, {r10-r11, lr}
98 adr ip, .Lcopyin_fault
99 ldr r11, [r10, #PCB_ONFAULT]
100 str ip, [r10, #PCB_ONFAULT]
102 str r11, [r10, #PCB_ONFAULT]
104 ldmfd sp!, {r10-r11, pc}
108 str r11, [r10, #PCB_ONFAULT]
110 ldmfdgt sp!, {r4-r7} /* r3 > 0 Restore r4-r7 */
111 ldmfdlt sp!, {r4-r9} /* r3 < 0 Restore r4-r9 */
112 ldmfd sp!, {r10-r11, pc}
116 /* Word-align the destination buffer */
117 ands ip, r1, #0x03 /* Already word aligned? */
118 beq .Lcopyin_wordaligned /* Yup */
120 cmp r2, ip /* Enough bytes left to align it? */
121 blt .Lcopyin_l4_2 /* Nope. Just copy bytewise */
124 addne pc, pc, ip, lsl #3
126 ldrbt ip, [r0], #0x01
128 ldrbt ip, [r0], #0x01
130 ldrbt ip, [r0], #0x01
132 cmp r2, #0x00 /* All done? */
135 /* Destination buffer is now word aligned */
136 .Lcopyin_wordaligned:
137 ands ip, r0, #0x03 /* Is src also word-aligned? */
138 bne .Lcopyin_bad_align /* Nope. Things just got bad */
139 cmp r2, #0x08 /* Less than 8 bytes remaining? */
140 blt .Lcopyin_w_less_than8
142 /* Quad-align the destination buffer */
143 tst r1, #0x07 /* Already quad aligned? */
144 ldrtne ip, [r0], #0x04
145 strne ip, [r1], #0x04
147 stmfd sp!, {r4-r9} /* Free up some registers */
148 mov r3, #-1 /* Signal restore r4-r9 */
150 /* Destination buffer quad aligned, source is word aligned */
152 blt .Lcopyin_w_lessthan128
154 /* Copy 128 bytes at a time */
156 ldrt r4, [r0], #0x04 /* LD:00-03 */
157 ldrt r5, [r0], #0x04 /* LD:04-07 */
158 pld [r0, #0x18] /* Prefetch 0x20 */
159 ldrt r6, [r0], #0x04 /* LD:08-0b */
160 ldrt r7, [r0], #0x04 /* LD:0c-0f */
161 ldrt r8, [r0], #0x04 /* LD:10-13 */
162 ldrt r9, [r0], #0x04 /* LD:14-17 */
163 strd r4, [r1], #0x08 /* ST:00-07 */
164 ldrt r4, [r0], #0x04 /* LD:18-1b */
165 ldrt r5, [r0], #0x04 /* LD:1c-1f */
166 strd r6, [r1], #0x08 /* ST:08-0f */
167 ldrt r6, [r0], #0x04 /* LD:20-23 */
168 ldrt r7, [r0], #0x04 /* LD:24-27 */
169 pld [r0, #0x18] /* Prefetch 0x40 */
170 strd r8, [r1], #0x08 /* ST:10-17 */
171 ldrt r8, [r0], #0x04 /* LD:28-2b */
172 ldrt r9, [r0], #0x04 /* LD:2c-2f */
173 strd r4, [r1], #0x08 /* ST:18-1f */
174 ldrt r4, [r0], #0x04 /* LD:30-33 */
175 ldrt r5, [r0], #0x04 /* LD:34-37 */
176 strd r6, [r1], #0x08 /* ST:20-27 */
177 ldrt r6, [r0], #0x04 /* LD:38-3b */
178 ldrt r7, [r0], #0x04 /* LD:3c-3f */
179 strd r8, [r1], #0x08 /* ST:28-2f */
180 ldrt r8, [r0], #0x04 /* LD:40-43 */
181 ldrt r9, [r0], #0x04 /* LD:44-47 */
182 pld [r0, #0x18] /* Prefetch 0x60 */
183 strd r4, [r1], #0x08 /* ST:30-37 */
184 ldrt r4, [r0], #0x04 /* LD:48-4b */
185 ldrt r5, [r0], #0x04 /* LD:4c-4f */
186 strd r6, [r1], #0x08 /* ST:38-3f */
187 ldrt r6, [r0], #0x04 /* LD:50-53 */
188 ldrt r7, [r0], #0x04 /* LD:54-57 */
189 strd r8, [r1], #0x08 /* ST:40-47 */
190 ldrt r8, [r0], #0x04 /* LD:58-5b */
191 ldrt r9, [r0], #0x04 /* LD:5c-5f */
192 strd r4, [r1], #0x08 /* ST:48-4f */
193 ldrt r4, [r0], #0x04 /* LD:60-63 */
194 ldrt r5, [r0], #0x04 /* LD:64-67 */
195 pld [r0, #0x18] /* Prefetch 0x80 */
196 strd r6, [r1], #0x08 /* ST:50-57 */
197 ldrt r6, [r0], #0x04 /* LD:68-6b */
198 ldrt r7, [r0], #0x04 /* LD:6c-6f */
199 strd r8, [r1], #0x08 /* ST:58-5f */
200 ldrt r8, [r0], #0x04 /* LD:70-73 */
201 ldrt r9, [r0], #0x04 /* LD:74-77 */
202 strd r4, [r1], #0x08 /* ST:60-67 */
203 ldrt r4, [r0], #0x04 /* LD:78-7b */
204 ldrt r5, [r0], #0x04 /* LD:7c-7f */
205 strd r6, [r1], #0x08 /* ST:68-6f */
206 strd r8, [r1], #0x08 /* ST:70-77 */
208 strd r4, [r1], #0x08 /* ST:78-7f */
209 bge .Lcopyin_w_loop128
211 .Lcopyin_w_lessthan128:
212 adds r2, r2, #0x80 /* Adjust for extra sub */
216 blt .Lcopyin_w_lessthan32
218 /* Copy 32 bytes at a time */
234 bge .Lcopyin_w_loop32
236 .Lcopyin_w_lessthan32:
237 adds r2, r2, #0x20 /* Adjust for extra sub */
239 RETeq /* Return now if done */
244 add pc, pc, r5, lsl #1
247 /* At least 24 bytes remaining */
253 /* At least 16 bytes remaining */
259 /* At least 8 bytes remaining */
265 /* Less than 8 bytes remaining */
267 RETeq /* Return now if done */
270 .Lcopyin_w_less_than8:
272 ldrtge ip, [r0], #0x04
273 strge ip, [r1], #0x04
274 RETeq /* Return now if done */
276 ldrbt ip, [r0], #0x01
278 ldrbtge r2, [r0], #0x01
281 strbge r2, [r1], #0x01
286 * At this point, it has not been possible to word align both buffers.
287 * The destination buffer (r1) is word aligned, but the source buffer
300 .Lcopyin_bad1_loop16:
307 orr r4, r4, r5, lsl #24
309 orr r5, r5, r6, lsl #24
311 orr r6, r6, r7, lsl #24
313 orr r7, r7, ip, lsl #24
320 bge .Lcopyin_bad1_loop16
324 RETeq /* Return now if done */
333 orr r4, r4, ip, lsl #24
335 bge .Lcopyin_bad1_loop4
339 .Lcopyin_bad2_loop16:
346 orr r4, r4, r5, lsl #16
348 orr r5, r5, r6, lsl #16
350 orr r6, r6, r7, lsl #16
352 orr r7, r7, ip, lsl #16
359 bge .Lcopyin_bad2_loop16
363 RETeq /* Return now if done */
372 orr r4, r4, ip, lsl #16
374 bge .Lcopyin_bad2_loop4
378 .Lcopyin_bad3_loop16:
385 orr r4, r4, r5, lsl #8
387 orr r5, r5, r6, lsl #8
389 orr r6, r6, r7, lsl #8
391 orr r7, r7, ip, lsl #8
398 bge .Lcopyin_bad3_loop16
402 RETeq /* Return now if done */
411 orr r4, r4, ip, lsl #8
413 bge .Lcopyin_bad3_loop4
423 addne pc, pc, r2, lsl #3
425 ldrbt ip, [r0], #0x01
427 ldrbt ip, [r0], #0x01
435 * r0 = kernel space address
436 * r1 = user space address
439 * Copies bytes from kernel space to user space
444 movle pc, lr /* Bail early if length is <= 0 */
450 ldr r12, =(VM_MAXUSER_ADDRESS + 1)
455 ldr r3, .L_arm_memcpy
459 ldr r3, .L_min_memcpy_size
463 stmfd sp!, {r0-r2, r4, lr}
467 mov r3, #1 /* DST_IS_USER */
468 ldr r4, .L_arm_memcpy
472 ldmfd sp!, {r0-r2, r4, lr}
477 stmfd sp!, {r10-r11, lr}
483 adr ip, .Lcopyout_fault
484 ldr r11, [r10, #PCB_ONFAULT]
485 str ip, [r10, #PCB_ONFAULT]
487 str r11, [r10, #PCB_ONFAULT]
489 ldmfd sp!, {r10-r11, pc}
493 str r11, [r10, #PCB_ONFAULT]
495 ldmfdgt sp!, {r4-r7} /* r3 > 0 Restore r4-r7 */
496 ldmfdlt sp!, {r4-r9} /* r3 < 0 Restore r4-r9 */
497 ldmfd sp!, {r10-r11, pc}
501 /* Word-align the destination buffer */
502 ands ip, r1, #0x03 /* Already word aligned? */
503 beq .Lcopyout_wordaligned /* Yup */
505 cmp r2, ip /* Enough bytes left to align it? */
506 blt .Lcopyout_l4_2 /* Nope. Just copy bytewise */
509 addne pc, pc, ip, lsl #3
512 strbt ip, [r1], #0x01
514 strbt ip, [r1], #0x01
516 strbt ip, [r1], #0x01
517 cmp r2, #0x00 /* All done? */
520 /* Destination buffer is now word aligned */
521 .Lcopyout_wordaligned:
522 ands ip, r0, #0x03 /* Is src also word-aligned? */
523 bne .Lcopyout_bad_align /* Nope. Things just got bad */
524 cmp r2, #0x08 /* Less than 8 bytes remaining? */
525 blt .Lcopyout_w_less_than8
527 /* Quad-align the destination buffer */
528 tst r0, #0x07 /* Already quad aligned? */
529 ldrne ip, [r0], #0x04
531 strtne ip, [r1], #0x04
533 stmfd sp!, {r4-r9} /* Free up some registers */
534 mov r3, #-1 /* Signal restore r4-r9 */
536 /* Destination buffer word aligned, source is quad aligned */
538 blt .Lcopyout_w_lessthan128
540 /* Copy 128 bytes at a time */
542 ldrd r4, [r0], #0x08 /* LD:00-07 */
543 pld [r0, #0x18] /* Prefetch 0x20 */
544 ldrd r6, [r0], #0x08 /* LD:08-0f */
545 ldrd r8, [r0], #0x08 /* LD:10-17 */
546 strt r4, [r1], #0x04 /* ST:00-03 */
547 strt r5, [r1], #0x04 /* ST:04-07 */
548 ldrd r4, [r0], #0x08 /* LD:18-1f */
549 strt r6, [r1], #0x04 /* ST:08-0b */
550 strt r7, [r1], #0x04 /* ST:0c-0f */
551 ldrd r6, [r0], #0x08 /* LD:20-27 */
552 pld [r0, #0x18] /* Prefetch 0x40 */
553 strt r8, [r1], #0x04 /* ST:10-13 */
554 strt r9, [r1], #0x04 /* ST:14-17 */
555 ldrd r8, [r0], #0x08 /* LD:28-2f */
556 strt r4, [r1], #0x04 /* ST:18-1b */
557 strt r5, [r1], #0x04 /* ST:1c-1f */
558 ldrd r4, [r0], #0x08 /* LD:30-37 */
559 strt r6, [r1], #0x04 /* ST:20-23 */
560 strt r7, [r1], #0x04 /* ST:24-27 */
561 ldrd r6, [r0], #0x08 /* LD:38-3f */
562 strt r8, [r1], #0x04 /* ST:28-2b */
563 strt r9, [r1], #0x04 /* ST:2c-2f */
564 ldrd r8, [r0], #0x08 /* LD:40-47 */
565 pld [r0, #0x18] /* Prefetch 0x60 */
566 strt r4, [r1], #0x04 /* ST:30-33 */
567 strt r5, [r1], #0x04 /* ST:34-37 */
568 ldrd r4, [r0], #0x08 /* LD:48-4f */
569 strt r6, [r1], #0x04 /* ST:38-3b */
570 strt r7, [r1], #0x04 /* ST:3c-3f */
571 ldrd r6, [r0], #0x08 /* LD:50-57 */
572 strt r8, [r1], #0x04 /* ST:40-43 */
573 strt r9, [r1], #0x04 /* ST:44-47 */
574 ldrd r8, [r0], #0x08 /* LD:58-4f */
575 strt r4, [r1], #0x04 /* ST:48-4b */
576 strt r5, [r1], #0x04 /* ST:4c-4f */
577 ldrd r4, [r0], #0x08 /* LD:60-67 */
578 pld [r0, #0x18] /* Prefetch 0x80 */
579 strt r6, [r1], #0x04 /* ST:50-53 */
580 strt r7, [r1], #0x04 /* ST:54-57 */
581 ldrd r6, [r0], #0x08 /* LD:68-6f */
582 strt r8, [r1], #0x04 /* ST:58-5b */
583 strt r9, [r1], #0x04 /* ST:5c-5f */
584 ldrd r8, [r0], #0x08 /* LD:70-77 */
585 strt r4, [r1], #0x04 /* ST:60-63 */
586 strt r5, [r1], #0x04 /* ST:64-67 */
587 ldrd r4, [r0], #0x08 /* LD:78-7f */
588 strt r6, [r1], #0x04 /* ST:68-6b */
589 strt r7, [r1], #0x04 /* ST:6c-6f */
590 strt r8, [r1], #0x04 /* ST:70-73 */
591 strt r9, [r1], #0x04 /* ST:74-77 */
593 strt r4, [r1], #0x04 /* ST:78-7b */
594 strt r5, [r1], #0x04 /* ST:7c-7f */
595 bge .Lcopyout_w_loop128
597 .Lcopyout_w_lessthan128:
598 adds r2, r2, #0x80 /* Adjust for extra sub */
600 RETeq /* Return now if done */
602 blt .Lcopyout_w_lessthan32
604 /* Copy 32 bytes at a time */
620 bge .Lcopyout_w_loop32
622 .Lcopyout_w_lessthan32:
623 adds r2, r2, #0x20 /* Adjust for extra sub */
625 RETeq /* Return now if done */
630 add pc, pc, r5, lsl #1
633 /* At least 24 bytes remaining */
639 /* At least 16 bytes remaining */
645 /* At least 8 bytes remaining */
651 /* Less than 8 bytes remaining */
653 RETeq /* Return now if done */
656 .Lcopyout_w_less_than8:
658 ldrge ip, [r0], #0x04
659 strtge ip, [r1], #0x04
660 RETeq /* Return now if done */
664 ldrbge r2, [r0], #0x01
665 strbt ip, [r1], #0x01
667 strbtge r2, [r1], #0x01
672 * At this point, it has not been possible to word align both buffers.
673 * The destination buffer (r1) is word aligned, but the source buffer
686 .Lcopyout_bad1_loop16:
693 orr r4, r4, r5, lsl #24
695 orr r5, r5, r6, lsl #24
697 orr r6, r6, r7, lsl #24
699 orr r7, r7, ip, lsl #24
706 bge .Lcopyout_bad1_loop16
710 RETeq /* Return now if done */
715 .Lcopyout_bad1_loop4:
719 orr r4, r4, ip, lsl #24
721 bge .Lcopyout_bad1_loop4
725 .Lcopyout_bad2_loop16:
732 orr r4, r4, r5, lsl #16
734 orr r5, r5, r6, lsl #16
736 orr r6, r6, r7, lsl #16
738 orr r7, r7, ip, lsl #16
745 bge .Lcopyout_bad2_loop16
749 RETeq /* Return now if done */
754 .Lcopyout_bad2_loop4:
758 orr r4, r4, ip, lsl #16
760 bge .Lcopyout_bad2_loop4
764 .Lcopyout_bad3_loop16:
771 orr r4, r4, r5, lsl #8
773 orr r5, r5, r6, lsl #8
775 orr r6, r6, r7, lsl #8
777 orr r7, r7, ip, lsl #8
784 bge .Lcopyout_bad3_loop16
788 RETeq /* Return now if done */
793 .Lcopyout_bad3_loop4:
797 orr r4, r4, ip, lsl #8
799 bge .Lcopyout_bad3_loop4
809 addne pc, pc, r2, lsl #3
812 strbt ip, [r1], #0x01
814 strbt ip, [r1], #0x01