diff options
Diffstat (limited to 'firmware/target/sh/archos/ata-as-archos.S')
| -rw-r--r-- | firmware/target/sh/archos/ata-as-archos.S | 233 |
1 files changed, 0 insertions, 233 deletions
diff --git a/firmware/target/sh/archos/ata-as-archos.S b/firmware/target/sh/archos/ata-as-archos.S deleted file mode 100644 index c403c4c921..0000000000 --- a/firmware/target/sh/archos/ata-as-archos.S +++ /dev/null @@ -1,233 +0,0 @@ -/*************************************************************************** - * __________ __ ___. - * Open \______ \ ____ ____ | | _\_ |__ _______ ___ - * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / - * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < - * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ - * \/ \/ \/ \/ \/ - * $Id$ - * - * Copyright (C) 2004-2006 by Jens Arnold - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2 - * of the License, or (at your option) any later version. - * - * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY - * KIND, either express or implied. - * - ****************************************************************************/ - - .section .icode,"ax",@progbits - - .align 2 - .global _copy_read_sectors - .type _copy_read_sectors,@function - -/* Read a number of words from the ATA data port - * - * Assumes wordcount to be a multiple of 4 - * - * Arguments: - * r4 - buffer address - * r5 - word count - * - * Register usage: - * r0 - scratch - * r1/r2 - read buffers - * r3 - mask (if unaligned) - * r4 - current address - * r5 - end address - * r6 - ata port - */ - -_copy_read_sectors: - add r5, r5 /* words -> bytes */ - add r4, r5 /* bytes -> end address */ - add #-12, r5 /* adjust for offsets */ - mov.l .ata_data, r6 - - mov r4, r0 - tst #1, r0 /* 16-bit aligned ? */ - bt .r_aligned /* yes, do word copy */ - - /* not 16-bit aligned */ - mov #-1, r3 /* prepare a bit mask for high byte */ - shll8 r3 /* r3 = 0xFFFFFF00 */ - - mov.w @r6, r2 /* read first word (1st round) */ - mov.b r2, @r4 /* store low byte of first word */ - bra .r_start_b /* jump into loop after next instr. */ - add #-5, r4 /* adjust for dest. offsets; now even */ - - .align 2 -.r_loop_b: /* main loop: copy 4 words in a row */ - mov.w @r6, r2 /* read first word (2+ round) */ - and r3, r1 /* get high byte of fourth word (2+ round) */ - extu.b r2, r0 /* get low byte of first word (2+ round) */ - or r1, r0 /* combine with high byte of fourth word */ - mov.w r0, @(4, r4) /* store at buf[4] */ - nop /* maintain alignment */ -.r_start_b: - mov.w @r6, r1 /* read second word */ - and r3, r2 /* get high byte of first word */ - extu.b r1, r0 /* get low byte of second word */ - or r2, r0 /* combine with high byte of first word */ - mov.w r0, @(6, r4) /* store at buf[6] */ - add #8, r4 /* buf += 8 */ - mov.w @r6, r2 /* read third word */ - and r3, r1 /* get high byte of second word */ - extu.b r2, r0 /* get low byte of third word */ - or r1, r0 /* combine with high byte of second word */ - mov.w r0, @r4 /* store at buf[0] */ - cmp/hi r4, r5 /* check for end */ - mov.w @r6, r1 /* read fourth word */ - and r3, r2 /* get high byte of third word */ - extu.b r1, r0 /* get low byte of fourth word */ - or r2, r0 /* combine with high byte of third word */ - mov.w r0, @(2, r4) /* store at buf[2] */ - bt .r_loop_b - /* 24 instructions for 4 copies, takes 30 clock cycles (4 wait) */ - /* avg. 7.5 cycles per word */ - - swap.b r1, r0 /* get high byte of last word */ - rts - mov.b r0, @(4, r4) /* and store it */ - - /* 16-bit aligned, loop(read and store word) */ -.r_aligned: - mov.w @r6, r2 /* read first word (1st round) */ - bra .r_start_w /* jump into loop after next instr. */ - add #-6, r4 /* adjust for destination offsets */ - - .align 2 -.r_loop_w: /* main loop: copy 4 words in a row */ - mov.w @r6, r2 /* read first word (2+ round) */ - swap.b r1, r0 /* swap fourth word (2+ round) */ - mov.w r0, @(4, r4) /* store fourth word (2+ round) */ - nop /* maintain alignment */ -.r_start_w: - mov.w @r6, r1 /* read second word */ - swap.b r2, r0 /* swap first word */ - mov.w r0, @(6, r4) /* store first word in buf[6] */ - add #8, r4 /* buf += 8 */ - mov.w @r6, r2 /* read third word */ - swap.b r1, r0 /* swap second word */ - mov.w r0, @r4 /* store second word in buf[0] */ - cmp/hi r4, r5 /* check for end */ - mov.w @r6, r1 /* read fourth word */ - swap.b r2, r0 /* swap third word */ - mov.w r0, @(2, r4) /* store third word */ - bt .r_loop_w - /* 16 instructions for 4 copies, takes 22 clock cycles (4 wait) */ - /* avg. 5.5 cycles per word */ - - swap.b r1, r0 /* swap fourth word (last round) */ - rts - mov.w r0, @(4, r4) /* and store it */ - -.r_end: - .size _copy_read_sectors,.r_end-_copy_read_sectors - - .align 2 - .global _copy_write_sectors - .type _copy_write_sectors,@function - -/* Write a number of words to the ATA data port - * - * Assumes wordcount to be a multiple of 2. - * Writing is not unrolled as much as reading, for several reasons: - * - * - a similar instruction sequence is faster for writing than for reading - * because the auto-incrementing load instructions can be used - * - writing profits from warp mode - * - * Both of these add up to have writing faster than the more unrolled reading. - * - * Arguments: - * r4 - buffer address - * r5 - word count - * - * Register usage: - * r0/r1 - scratch - * r2/r3 - write buffers - * r4 - current address - * r5 - end address - * r6 - mask (if unaligned) - * r7 - ata port - */ - -_copy_write_sectors: - add r5, r5 /* words -> bytes */ - add r4, r5 /* bytes -> end address */ - add #-4, r5 /* adjust for offsets */ - mov.l .ata_data, r7 - - mov r4, r0 - tst #1, r0 /* 16-bit aligned ? */ - bt .w_aligned /* yes, do word copy */ - - /* not 16-bit aligned */ - mov #-1, r6 /* prepare a bit mask for high byte */ - shll8 r6 /* r6 = 0xFFFFFF00 */ - - mov.b @r4+, r2 /* load (initial old second) first byte */ - mov.w @r4+, r3 /* load (initial) first word */ - bra .w_start_b - extu.b r2, r0 /* extend unsigned */ - - .align 2 -.w_loop_b: /* main loop: copy 2 words in a row */ - mov.w @r4+, r3 /* load first word (2+ round) */ - extu.b r2, r0 /* put away low byte of second word (2+ round) */ - and r6, r2 /* get high byte of second word (2+ round) */ - or r1, r2 /* combine with low byte of old first word */ - mov.w r2, @r7 /* write that */ -.w_start_b: - cmp/hi r4, r5 /* check for end */ - mov.w @r4+, r2 /* load second word */ - extu.b r3, r1 /* put away low byte of first word */ - and r6, r3 /* get high byte of first word */ - or r0, r3 /* combine with high byte of old second word */ - mov.w r3, @r7 /* write that */ - bt .w_loop_b - /* 12 instructions for 2 copies, takes 14 clock cycles */ - /* avg. 7 cycles per word */ - - /* the loop "overreads" 1 byte past the buffer end, however, the last */ - /* byte is not written to disk */ - and r6, r2 /* get high byte of last word */ - or r1, r2 /* combine with low byte of old first word */ - rts - mov.w r2, @r7 /* write last word */ - - /* 16-bit aligned, loop(load and write word) */ -.w_aligned: - bra .w_start_w /* jump into loop after next instr. */ - mov.w @r4+, r2 /* load first word (1st round) */ - - .align 2 -.w_loop_w: /* main loop: copy 2 words in a row */ - mov.w @r4+, r2 /* load first word (2+ round) */ - swap.b r1, r0 /* swap second word (2+ round) */ - mov.w r0, @r7 /* write second word (2+ round) */ -.w_start_w: - cmp/hi r4, r5 /* check for end */ - mov.w @r4+, r1 /* load second word */ - swap.b r2, r0 /* swap first word */ - mov.w r0, @r7 /* write first word */ - bt .w_loop_w - /* 8 instructions for 2 copies, takes 10 clock cycles */ - /* avg. 5 cycles per word */ - - swap.b r1, r0 /* swap second word (last round) */ - rts - mov.w r0, @r7 /* and write it */ - -.w_end: - .size _copy_write_sectors,.w_end-_copy_write_sectors - - .align 2 -.ata_data: - .long 0x06104100 /* ATA data port */ |