Integrate byte swap of ata word into ata-as-coldfire.S

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26105 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Marcin Bukat 2010-05-17 13:07:55 +00:00
parent 20041b96c8
commit a619caa833

View file

@ -8,6 +8,7 @@
* $Id$
*
* Copyright (C) 2006 by Jens Arnold
* Copyright (C) 2010 by Marcin Bukat (byte swaps)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@ -19,9 +20,21 @@
*
****************************************************************************/
.section .icode,"ax",@progbits
#include "config.h"
.macro SWAP_BYTES dn
move.l %a3, %d7 | d7 = 0x00FF00FF
and.l \dn, %d7 | d7 = .B.D
eor.l %d7, \dn | dn = A.C.
lsl.l #8, %d7 | d7 = B.D.
lsr.l #8, \dn | d3 = .A.C
or.l %d7, \dn | dn = BADC
.endm
.equ .ata_port, 0x20000020
.equ .swapmask, 0x00FF00FF
.section .icode,"ax",@progbits
.align 2
.global copy_read_sectors
@ -42,12 +55,24 @@
* %d0 - scratch
* %d1 - shift count
* %d2-%d6 - read buffers
*
* #ifdef SWAP_WORDS
* %d7 - byte swap scrach
* %a3 - byte swap mask
* #endif
*/
copy_read_sectors:
#ifdef SWAP_WORDS
lea.l (-32, %sp), %sp
movem.l %d2-%d7/%a2-%a3, (%sp)
movem.l (36, %sp), %a0-%a1
lea.l .swapmask, %a3
#else
lea.l (-24, %sp), %sp
movem.l %d2-%d6/%a2, (%sp)
movem.l (28, %sp), %a0-%a1
#endif
add.l %a1, %a1
add.l %a0, %a1
lea.l .ata_port, %a2
@ -61,18 +86,30 @@ copy_read_sectors:
moveq.l #24, %d1 /* preload shift count */
move.w (%a2), %d2 /* load initial word */
#ifdef SWAP_WORDS
move.b %d2, (%a0)+
lsr.l #8, %d2
#else
move.l %d2, %d3
lsr.l #8, %d3
move.b %d3, (%a0)+ /* write high byte of it, aligns dest addr */
#endif
btst.l #1, %d0 /* longword aligned? (testing old d0 value!) */
bne.b .r_end_u_w1 /* yes, skip leading word handling */
#ifdef SWAP_WORDS
move.w (%a2), %d3
lsl.l #8, %d2
move.b %d3, %d2
move.w %d2, (%a0)+ /* write bytes 2 and 3 as word */
move.l %d3, %d2
lsr.l #8, %d2
#else
swap %d2 /* move initial word up */
move.w (%a2), %d2 /* combine with second word */
move.l %d2, %d3
lsr.l #8, %d3
move.w %d3, (%a0)+ /* write bytes 2 and 3 as word */
#endif
.r_end_u_w1:
moveq.l #12, %d0
@ -85,6 +122,11 @@ copy_read_sectors:
move.w (%a2), %d3 /* load first word */
swap %d3 /* move to upper 16 bit */
move.w (%a2), %d3 /* load second word */
#ifdef SWAP_WORDS
SWAP_BYTES %d3
#endif
move.l %d3, %d4
lsl.l %d1, %d2
lsr.l #8, %d3
@ -101,6 +143,11 @@ copy_read_sectors:
move.w (%a2), %d3 /* load 1st word */
swap %d3 /* move to upper 16 bit */
move.w (%a2), %d3 /* load 2nd word */
#ifdef SWAP_WORDS
SWAP_BYTES %d3
#endif
move.l %d3, %d0
lsl.l %d1, %d2
lsr.l #8, %d0
@ -108,6 +155,11 @@ copy_read_sectors:
move.w (%a2), %d4 /* load 3rd word */
swap %d4 /* move to upper 16 bit */
move.w (%a2), %d4 /* load 4th word */
#ifdef SWAP_WORDS
SWAP_BYTES %d4
#endif
move.l %d4, %d0
lsl.l %d1, %d3
lsr.l #8, %d0
@ -115,6 +167,11 @@ copy_read_sectors:
move.w (%a2), %d5 /* load 5th word */
swap %d5 /* move to upper 16 bit */
move.w (%a2), %d5 /* load 6th word */
#ifdef SWAP_WORDS
SWAP_BYTES %d5
#endif
move.l %d5, %d0
lsl.l %d1, %d4
lsr.l #8, %d0
@ -122,6 +179,11 @@ copy_read_sectors:
move.w (%a2), %d6 /* load 7th word */
swap %d6 /* move to upper 16 bit */
move.w (%a2), %d6 /* load 8th word */
#ifdef SWAP_WORDS
SWAP_BYTES %d6
#endif
move.l %d6, %d0
lsl.l %d1, %d5
lsr.l #8, %d0
@ -140,6 +202,11 @@ copy_read_sectors:
move.w (%a2), %d3 /* load first word */
swap %d3 /* move to upper 16 bit */
move.w (%a2), %d3 /* load second word */
#ifdef SWAP_WORDS
SWAP_BYTES %d3
#endif
move.l %d3, %d4
lsl.l %d1, %d2
lsr.l #8, %d3
@ -152,23 +219,40 @@ copy_read_sectors:
.r_end_u_l2:
blo.b .r_end_u_w2 /* one word left? */
#ifdef SWAP_WORDS
move.w (%a2), %d3
lsl.l #8, %d2
move.b %d3, %d2
move.w %d2, (%a0)+ /* write bytes 2 and 3 as word */
move.l %d3, %d2
lsr.l #8, %d2
.r_end_u_w2:
move.b %d2, (%a0)+ /* store final byte */
bra.w .r_exit
#else
swap %d2 /* move old word to upper 16 bits */
move.w (%a2), %d2 /* load final word */
move.l %d2, %d3
lsr.l #8, %d3
move.w %d3, (%a0)+ /* write bytes 2 and 3 as word */
.r_end_u_w2:
move.b %d2, (%a0)+ /* store final byte */
bra.b .r_exit
#endif
/* 16-bit aligned */
.r_aligned:
btst.l #1, %d0 /* longword aligned? */
beq.b .r_end_a_w1 /* yes, skip leading word handling */
#ifdef SWAP_WORDS
move.w (%a2), %d7 /* copy initial word after byte swap */
move.b %d7, (%a0)+
lsr.l #8, %d7
move.b %d7, (%a0)+
#else
move.w (%a2), (%a0)+ /* copy initial word */
#endif
.r_end_a_w1:
moveq.l #12, %d0
add.l %a0, %d0
@ -180,6 +264,11 @@ copy_read_sectors:
move.w (%a2), %d1 /* load first word */
swap %d1 /* move it to upper 16 bits */
move.w (%a2), %d1 /* load second word */
#ifdef SWAP_WORDS
SWAP_BYTES %d1
#endif
move.l %d1, (%a0)+ /* store as long */
cmp.l %a0, %d0 /* run up to first line bound */
bhi.b .r_loop_a_l1
@ -200,6 +289,14 @@ copy_read_sectors:
move.w (%a2), %d3 /* load 7th word */
swap %d3 /* move it to upper 16 bits */
move.w (%a2), %d3 /* load 8th word */
#ifdef SWAP_WORDS
SWAP_BYTES %d0
SWAP_BYTES %d1
SWAP_BYTES %d2
SWAP_BYTES %d3
#endif
movem.l %d0-%d3, (%a0) /* store line */
lea.l (16, %a0), %a0
cmp.l %a0, %a1 /* run up to last line bound */
@ -213,6 +310,11 @@ copy_read_sectors:
move.w (%a2), %d1 /* read first word */
swap %d1 /* move it to upper 16 bits */
move.w (%a2), %d1 /* read second word */
#ifdef SWAP_WORDS
SWAP_BYTES %d1
#endif
move.l %d1, (%a0)+ /* store as long */
cmp.l %a0, %a1 /* run up to last long bound */
bhi.b .r_loop_a_l2
@ -220,13 +322,24 @@ copy_read_sectors:
.r_end_a_l2:
blo.b .r_end_a_w2 /* one word left? */
#ifdef SWAP_WORDS
move.w (%a2), %d7 /* copy final word after byte swap */
move.b %d7, (%a0)+
lsr.l #8, %d7
move.b %d7, (%a0)+
#else
move.w (%a2), (%a0)+ /* copy final word */
#endif
.r_end_a_w2:
.r_exit:
#ifdef SWAP_WORDS
movem.l (%sp), %d2-%d7/%a2-%a3
lea.l (32, %sp), %sp
#else
movem.l (%sp), %d2-%d6/%a2
lea.l (24, %sp), %sp
#endif
rts
.r_end:
@ -251,12 +364,24 @@ copy_read_sectors:
* %d0 - scratch
* %d1 - shift count
* %d2-%d6 - read buffers
*
* #ifdef SWAP_WORDS
* %d7 - swap scrach
* %a3 - swap mask
* #endif
*/
copy_write_sectors:
#ifdef SWAP_WORDS
lea.l (-32, %sp), %sp
movem.l %d2-%d7/%a2-%a3, (%sp)
movem.l (36, %sp), %a0-%a1
lea.l .swapmask, %a3
#else
lea.l (-24, %sp), %sp
movem.l %d2-%d6/%a2, (%sp)
movem.l (28, %sp), %a0-%a1
#endif
add.l %a1, %a1
add.l %a0, %a1
lea.l .ata_port, %a2
@ -278,6 +403,14 @@ copy_write_sectors:
move.w (%a0)+, %d2
move.l %d2, %d3
lsr.l #8, %d3
#ifdef SWAP_WORDS
move.l %d3, %d7 /* byte swap low word of %d3 */
lsr.l #8, %d7
lsl.l #8, %d3
move.b %d7, %d3
#endif
move.w %d3, (%a2)
.w_end_u_w1:
@ -293,6 +426,11 @@ copy_write_sectors:
lsl.l %d1, %d2
lsr.l #8, %d3
or.l %d3, %d2
#ifdef SWAP_WORDS
SWAP_BYTES %d2
#endif
swap %d2
move.w %d2, (%a2)
swap %d2
@ -311,6 +449,11 @@ copy_write_sectors:
lsl.l %d1, %d2
lsr.l #8, %d0
or.l %d0, %d2
#ifdef SWAP_WORDS
SWAP_BYTES %d2
#endif
swap %d2
move.w %d2, (%a2)
swap %d2
@ -319,6 +462,11 @@ copy_write_sectors:
lsl.l %d1, %d3
lsr.l #8, %d0
or.l %d0, %d3
#ifdef SWAP_WORDS
SWAP_BYTES %d3
#endif
swap %d3
move.w %d3, (%a2)
swap %d3
@ -327,6 +475,11 @@ copy_write_sectors:
lsl.l %d1, %d4
lsr.l #8, %d0
or.l %d0, %d4
#ifdef SWAP_WORDS
SWAP_BYTES %d4
#endif
swap %d4
move.w %d4, (%a2)
swap %d4
@ -335,6 +488,11 @@ copy_write_sectors:
lsl.l %d1, %d5
lsr.l #8, %d0
or.l %d0, %d5
#ifdef SWAP_WORDS
SWAP_BYTES %d5
#endif
swap %d5
move.w %d5, (%a2)
swap %d5
@ -353,6 +511,11 @@ copy_write_sectors:
lsl.l %d1, %d2
lsr.l #8, %d3
or.l %d3, %d2
#ifdef SWAP_WORDS
SWAP_BYTES %d2
#endif
swap %d2
move.w %d2, (%a2)
swap %d2
@ -368,20 +531,43 @@ copy_write_sectors:
move.w (%a0)+, %d2
move.l %d2, %d3
lsr.l #8, %d3
#ifdef SWAP_WORDS
SWAP_BYTES %d3
#endif
move.w %d3, (%a2)
.w_end_u_w2:
#ifdef SWAP_WORDS
move.l %d2, %d7
move.b (%a0)+, %d2
lsl.l #8, %d2
move.b %d7, %d2
move.w %d2, (%a2)
bra.w .w_exit
#else
lsl.l #8, %d2
move.b (%a0)+, %d2
move.w %d2, (%a2)
bra.b .w_exit
#endif
/* 16-bit aligned */
.w_aligned:
btst.l #1, %d0
beq.b .w_end_a_w1
#ifdef SWAP_WORDS
move.w (%a0)+, %d1 /* copy initial word bytes swaped */
move.l %d1, %d7
lsl.l #8, %d1
lsr.l #8, %d7
move.b %d7, %d1
move.w %d1, (%a2)
#else
move.w (%a0)+, (%a2) /* copy initial word */
#endif
.w_end_a_w1:
moveq.l #12, %d0
@ -392,6 +578,11 @@ copy_write_sectors:
.w_loop_a_l1:
move.l (%a0)+, %d1
#ifdef SWAP_WORDS
SWAP_BYTES %d1
#endif
swap %d1
move.w %d1, (%a2)
swap %d1
@ -405,6 +596,14 @@ copy_write_sectors:
.w_loop_a_line:
movem.l (%a0), %d0-%d3
lea.l (16, %a0), %a0
#ifdef SWAP_WORDS
SWAP_BYTES %d0
SWAP_BYTES %d1
SWAP_BYTES %d2
SWAP_BYTES %d3
#endif
swap %d0
move.w %d0, (%a2)
swap %d0
@ -430,6 +629,11 @@ copy_write_sectors:
.w_loop_a_l2:
move.l (%a0)+, %d1
#ifdef SWAP_WORDS
SWAP_BYTES %d1
#endif
swap %d1
move.w %d1, (%a2)
swap %d1
@ -440,13 +644,27 @@ copy_write_sectors:
.w_end_a_l2:
blo.b .w_end_a_w2 /* one word left? */
#ifdef SWAP_WORDS
move.w (%a0)+, %d0 /* copy final word after byte swap */
move.l %d0, %d7
lsl.l #8, %d0
lsr.l #8, %d7
move.b %d7, %d0
move.w %d0, (%a2)
#else
move.w (%a0)+, (%a2) /* copy final word */
#endif
.w_end_a_w2:
.w_exit:
#ifdef SWAP_WORDS
movem.l (%sp), %d2-%d7/%a2-%a3
lea.l (32, %sp), %sp
#else
movem.l (%sp), %d2-%d6/%a2
lea.l (24, %sp), %sp
#endif
rts
.w_end: