2acc0ac542
later. We still need to hunt down snippets used that are not. 1324 modified files... http://www.rockbox.org/mail/archive/rockbox-dev-archive-2008-06/0060.shtml git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17847 a1c6a512-1295-4272-9138-f99709370657
461 lines
13 KiB
ArmAsm
461 lines
13 KiB
ArmAsm
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2006 by Jens Arnold
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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.section .icode,"ax",@progbits
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.equ .ata_port, 0x20000020
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.align 2
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.global copy_read_sectors
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.type copy_read_sectors,@function
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/* Read a number of words from the ATA data port
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*
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* Utilises line bursts, assumes there is at least one full line to copy.
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*
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* Arguments:
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* (4,%sp) - buffer address
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* (8,%sp) - word count
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*
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* Register usage:
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* %a0 - current address
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* %a1 - end address
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* %a2 - ata port
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* %d0 - scratch
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* %d1 - shift count
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* %d2-%d6 - read buffers
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*/
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copy_read_sectors:
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lea.l (-24, %sp), %sp
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movem.l %d2-%d6/%a2, (%sp)
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movem.l (28, %sp), %a0-%a1
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add.l %a1, %a1
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add.l %a0, %a1
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lea.l .ata_port, %a2
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move.l %a0, %d0
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btst.l #0, %d0 /* 16-bit aligned? */
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jeq .r_aligned /* yes, do word copy */
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/* not 16-bit aligned */
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subq.l #1, %a1 /* last byte is done unconditionally */
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moveq.l #24, %d1 /* preload shift count */
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move.w (%a2), %d2 /* load initial word */
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move.l %d2, %d3
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lsr.l #8, %d3
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move.b %d3, (%a0)+ /* write high byte of it, aligns dest addr */
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btst.l #1, %d0 /* longword aligned? (testing old d0 value!) */
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bne.b .r_end_u_w1 /* yes, skip leading word handling */
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swap %d2 /* move initial word up */
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move.w (%a2), %d2 /* combine with second word */
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move.l %d2, %d3
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lsr.l #8, %d3
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move.w %d3, (%a0)+ /* write bytes 2 and 3 as word */
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.r_end_u_w1:
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moveq.l #12, %d0
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add.l %a0, %d0
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and.l #0xFFFFFFF0,%d0 /* d0 == first line bound */
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cmp.l %a0, %d0 /* any leading longwords? */
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bls.b .r_end_u_l1 /* no: skip loop */
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.r_loop_u_l1:
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move.w (%a2), %d3 /* load first word */
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swap %d3 /* move to upper 16 bit */
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move.w (%a2), %d3 /* load second word */
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move.l %d3, %d4
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lsl.l %d1, %d2
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lsr.l #8, %d3
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or.l %d3, %d2 /* combine old low byte with new top 3 bytes */
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move.l %d2, (%a0)+ /* store as long */
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move.l %d4, %d2
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cmp.l %a0, %d0 /* run up to first line bound */
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bhi.b .r_loop_u_l1
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.r_end_u_l1:
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lea.l (-14, %a1), %a1 /* adjust end addr. to 16 bytes/pass */
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.r_loop_u_line:
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move.w (%a2), %d3 /* load 1st word */
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swap %d3 /* move to upper 16 bit */
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move.w (%a2), %d3 /* load 2nd word */
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move.l %d3, %d0
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lsl.l %d1, %d2
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lsr.l #8, %d0
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or.l %d0, %d2 /* combine old low byte with new top 3 bytes */
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move.w (%a2), %d4 /* load 3rd word */
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swap %d4 /* move to upper 16 bit */
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move.w (%a2), %d4 /* load 4th word */
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move.l %d4, %d0
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lsl.l %d1, %d3
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lsr.l #8, %d0
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or.l %d0, %d3 /* combine old low byte with new top 3 bytes */
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move.w (%a2), %d5 /* load 5th word */
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swap %d5 /* move to upper 16 bit */
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move.w (%a2), %d5 /* load 6th word */
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move.l %d5, %d0
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lsl.l %d1, %d4
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lsr.l #8, %d0
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or.l %d0, %d4 /* combine old low byte with new top 3 bytes */
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move.w (%a2), %d6 /* load 7th word */
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swap %d6 /* move to upper 16 bit */
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move.w (%a2), %d6 /* load 8th word */
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move.l %d6, %d0
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lsl.l %d1, %d5
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lsr.l #8, %d0
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or.l %d0, %d5 /* combine old low byte with new top 3 bytes */
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movem.l %d2-%d5, (%a0) /* store line */
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lea.l (16, %a0), %a0
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move.l %d6, %d2
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cmp.l %a0, %a1 /* run up to last line bound */
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bhi.b .r_loop_u_line
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lea.l (12, %a1), %a1 /* readjust for longword loop */
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cmp.l %a0, %a1 /* any trailing longwords? */
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bls.b .r_end_u_l2 /* no: skip loop */
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.r_loop_u_l2:
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move.w (%a2), %d3 /* load first word */
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swap %d3 /* move to upper 16 bit */
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move.w (%a2), %d3 /* load second word */
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move.l %d3, %d4
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lsl.l %d1, %d2
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lsr.l #8, %d3
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or.l %d3, %d2 /* combine old low byte with new top 3 bytes */
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move.l %d2, (%a0)+ /* store as long */
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move.l %d4, %d2
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cmp.l %a0, %a1 /* run up to last long bound */
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bhi.b .r_loop_u_l2
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.r_end_u_l2:
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addq.l #2, %a1 /* back to final end address */
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cmp.l %a0, %a1 /* one word left? */
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bls.b .r_end_u_w2
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swap %d2 /* move old word to upper 16 bits */
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move.w (%a2), %d2 /* load final word */
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move.l %d2, %d3
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lsr.l #8, %d3
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move.w %d3, (%a0)+ /* write bytes 2 and 3 as word */
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.r_end_u_w2:
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move.b %d2, (%a0)+ /* store final byte */
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bra.b .r_exit
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/* 16-bit aligned */
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.r_aligned:
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btst.l #1, %d0 /* longword aligned? */
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beq.b .r_end_a_w1 /* yes, skip leading word handling */
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move.w (%a2), (%a0)+ /* copy initial word */
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.r_end_a_w1:
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moveq.l #12, %d0
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add.l %a0, %d0
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and.l #0xFFFFFFF0,%d0 /* d0 == first line bound */
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cmp.l %a0, %d0 /* any leading longwords? */
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bls.b .r_end_a_l1 /* no: skip loop */
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.r_loop_a_l1:
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move.w (%a2), %d1 /* load first word */
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swap %d1 /* move it to upper 16 bits */
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move.w (%a2), %d1 /* load second word */
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move.l %d1, (%a0)+ /* store as long */
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cmp.l %a0, %d0 /* run up to first line bound */
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bhi.b .r_loop_a_l1
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.r_end_a_l1:
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lea.l (-14, %a1), %a1 /* adjust end addr. to 16 bytes/pass */
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.r_loop_a_line:
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move.w (%a2), %d0 /* load 1st word */
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swap %d0 /* move it to upper 16 bits */
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move.w (%a2), %d0 /* load 2nd word */
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move.w (%a2), %d1 /* load 3rd word */
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swap %d1 /* move it to upper 16 bits */
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move.w (%a2), %d1 /* load 4th word */
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move.w (%a2), %d2 /* load 5th word */
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swap %d2 /* move it to upper 16 bits */
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move.w (%a2), %d2 /* load 6th word */
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move.w (%a2), %d3 /* load 7th word */
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swap %d3 /* move it to upper 16 bits */
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move.w (%a2), %d3 /* load 8th word */
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movem.l %d0-%d3, (%a0) /* store line */
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lea.l (16, %a0), %a0
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cmp.l %a0, %a1 /* run up to last line bound */
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bhi.b .r_loop_a_line
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lea.l (12, %a1), %a1 /* readjust for longword loop */
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cmp.l %a0, %a1 /* any trailing longwords? */
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bls.b .r_end_a_l2 /* no: skip loop */
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.r_loop_a_l2:
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move.w (%a2), %d1 /* read first word */
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swap %d1 /* move it to upper 16 bits */
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move.w (%a2), %d1 /* read second word */
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move.l %d1, (%a0)+ /* store as long */
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cmp.l %a0, %a1 /* run up to last long bound */
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bhi.b .r_loop_a_l2
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.r_end_a_l2:
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addq.l #2, %a1 /* back to final end address */
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cmp.l %a0, %a1 /* one word left? */
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bls.b .r_end_a_w2
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move.w (%a2), (%a0)+ /* copy final word */
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.r_end_a_w2:
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.r_exit:
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movem.l (%sp), %d2-%d6/%a2
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lea.l (24, %sp), %sp
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rts
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.r_end:
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.size copy_read_sectors,.r_end-copy_read_sectors
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.align 2
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.global copy_write_sectors
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.type copy_write_sectors,@function
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/* Write a number of words to the ATA data port
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*
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* Utilises line bursts, assumes there is at least one full line to copy.
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*
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* Arguments:
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* (4,%sp) - buffer address
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* (8,%sp) - word count
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*
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* Register usage:
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* %a0 - current address
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* %a1 - end address
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* %a2 - ata port
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* %d0 - scratch
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* %d1 - shift count
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* %d2-%d6 - read buffers
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*/
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copy_write_sectors:
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lea.l (-24, %sp), %sp
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movem.l %d2-%d6/%a2, (%sp)
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movem.l (28, %sp), %a0-%a1
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add.l %a1, %a1
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add.l %a0, %a1
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lea.l .ata_port, %a2
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move.l %a0, %d0
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btst.l #0, %d0 /* 16-bit aligned? */
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jeq .w_aligned /* yes, do word copy */
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/* not 16-bit aligned */
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subq.l #1, %a1 /* last byte is done unconditionally */
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moveq.l #24, %d1 /* preload shift count */
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move.b (%a0)+, %d2
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btst.l #1, %d0 /* longword aligned? (testing old d0 value!) */
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bne.b .w_end_u_w1 /* yes, skip leading word handling */
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swap %d2
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move.w (%a0)+, %d2
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move.l %d2, %d3
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lsr.l #8, %d3
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move.w %d3, (%a2)
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.w_end_u_w1:
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moveq.l #12, %d0
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add.l %a0, %d0
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and.l #0xFFFFFFF0,%d0 /* d0 == first line bound */
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cmp.l %a0, %d0 /* any leading longwords? */
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bls.b .w_end_u_l1 /* no: skip loop */
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.w_loop_u_l1:
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move.l (%a0)+, %d3
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move.l %d3, %d4
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lsl.l %d1, %d2
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lsr.l #8, %d3
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or.l %d3, %d2
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swap %d2
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move.w %d2, (%a2)
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swap %d2
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move.w %d2, (%a2)
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move.l %d4, %d2
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cmp.l %a0, %d0 /* run up to first line bound */
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bhi.b .w_loop_u_l1
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.w_end_u_l1:
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lea.l (-14, %a1), %a1 /* adjust end addr. to 16 bytes/pass */
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.w_loop_u_line:
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movem.l (%a0), %d3-%d6
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lea.l (16, %a0), %a0
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move.l %d3, %d0
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lsl.l %d1, %d2
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lsr.l #8, %d0
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or.l %d0, %d2
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swap %d2
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move.w %d2, (%a2)
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swap %d2
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move.w %d2, (%a2)
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move.l %d4, %d0
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lsl.l %d1, %d3
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lsr.l #8, %d0
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or.l %d0, %d3
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swap %d3
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move.w %d3, (%a2)
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swap %d3
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move.w %d3, (%a2)
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move.l %d5, %d0
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lsl.l %d1, %d4
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lsr.l #8, %d0
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or.l %d0, %d4
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swap %d4
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move.w %d4, (%a2)
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swap %d4
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move.w %d4, (%a2)
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move.l %d6, %d0
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lsl.l %d1, %d5
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lsr.l #8, %d0
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or.l %d0, %d5
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swap %d5
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move.w %d5, (%a2)
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swap %d5
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move.w %d5, (%a2)
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move.l %d6, %d2
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cmp.l %a0, %a1 /* run up to last line bound */
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bhi.b .w_loop_u_line
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lea.l (12, %a1), %a1 /* readjust for longword loop */
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cmp.l %a0, %a1 /* any trailing longwords? */
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bls.b .w_end_u_l2 /* no: skip loop */
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.w_loop_u_l2:
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move.l (%a0)+, %d3
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move.l %d3, %d4
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lsl.l %d1, %d2
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lsr.l #8, %d3
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or.l %d3, %d2
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swap %d2
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move.w %d2, (%a2)
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swap %d2
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move.w %d2, (%a2)
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move.l %d4, %d2
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cmp.l %a0, %a1 /* run up to first line bound */
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bhi.b .w_loop_u_l2
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.w_end_u_l2:
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addq.l #2, %a1 /* back to final end address */
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cmp.l %a0, %a1 /* one word left? */
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bls.b .w_end_u_w2
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swap %d2
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move.w (%a0)+, %d2
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move.l %d2, %d3
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lsr.l #8, %d3
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move.w %d3, (%a2)
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.w_end_u_w2:
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lsl.l #8, %d2
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move.b (%a0)+, %d2
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move.w %d2, (%a2)
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bra.b .w_exit
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/* 16-bit aligned */
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.w_aligned:
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btst.l #1, %d0
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beq.b .w_end_a_w1
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move.w (%a0)+, (%a2) /* copy initial word */
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.w_end_a_w1:
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moveq.l #12, %d0
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add.l %a0, %d0
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and.l #0xFFFFFFF0,%d0 /* d0 == first line bound */
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cmp.l %a0, %d0 /* any leading longwords? */
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bls.b .w_end_a_l1 /* no: skip loop */
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.w_loop_a_l1:
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move.l (%a0)+, %d1
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swap %d1
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move.w %d1, (%a2)
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swap %d1
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move.w %d1, (%a2)
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cmp.l %a0, %d0 /* run up to first line bound */
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bhi.b .w_loop_a_l1
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.w_end_a_l1:
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lea.l (-14, %a1), %a1 /* adjust end addr. to 16 bytes/pass */
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.w_loop_a_line:
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movem.l (%a0), %d0-%d3
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lea.l (16, %a0), %a0
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swap %d0
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move.w %d0, (%a2)
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swap %d0
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move.w %d0, (%a2)
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swap %d1
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move.w %d1, (%a2)
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swap %d1
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move.w %d1, (%a2)
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swap %d2
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move.w %d2, (%a2)
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swap %d2
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move.w %d2, (%a2)
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swap %d3
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move.w %d3, (%a2)
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swap %d3
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move.w %d3, (%a2)
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cmp.l %a0, %a1 /* run up to last line bound */
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bhi.b .w_loop_a_line
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lea.l (12, %a1), %a1 /* readjust for longword loop */
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cmp.l %a0, %a1 /* any trailing longwords? */
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bls.b .w_end_a_l2 /* no: skip loop */
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.w_loop_a_l2:
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move.l (%a0)+, %d1
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swap %d1
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move.w %d1, (%a2)
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swap %d1
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move.w %d1, (%a2)
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cmp.l %a0, %a1 /* run up to first line bound */
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bhi.b .w_loop_a_l2
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.w_end_a_l2:
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addq.l #2, %a1 /* back to final end address */
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cmp.l %a0, %a1 /* one word left? */
|
|
bls.b .w_end_a_w2
|
|
|
|
move.w (%a0)+, (%a2) /* copy final word */
|
|
|
|
.w_end_a_w2:
|
|
|
|
.w_exit:
|
|
movem.l (%sp), %d2-%d6/%a2
|
|
lea.l (24, %sp), %sp
|
|
rts
|
|
|
|
.w_end:
|
|
.size copy_write_sectors,.w_end-copy_write_sectors
|