436 lines
8.5 KiB
ArmAsm
436 lines
8.5 KiB
ArmAsm
;
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; Copyright (c) 2010, Kajtar Zsolt <soci@c64.rulez.org>
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; All rights reserved.
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;
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; Redistribution and use in source and binary forms, with or without
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; modification, are permitted provided that the following conditions
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; are met:
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; 1. Redistributions of source code must retain the above copyright
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; notice, this list of conditions and the following disclaimer.
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; 2. Redistributions in binary form must reproduce the above copyright
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; notice, this list of conditions and the following disclaimer in the
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; documentation and/or other materials provided with the distribution.
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; 3. Neither the name of the Institute nor the names of its contributors
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; may be used to endorse or promote products derived from this software
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; without specific prior written permission.
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;
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; THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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; ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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; OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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; HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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; OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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; SUCH DAMAGE.
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;
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; This file is part of the Contiki operating system.
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;
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; Author: Kajtar Zsolt <soci@c64.rulez.org>
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;
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;---------------------------------------------------------------------
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.define F_IDE64 1 ; support IDE64, 100 byte only
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.constructor init_pfs
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.destructor done_pfs
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.importzp ptr1, ptr2, ptr3, sp
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.import curunit, __filetype, popax, addysp, subysp
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.export pfs_rwcommon, pfs_rwsetflags, pfs_rwcommonend
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.if F_IDE64
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.export ide64_rwprepare, ide64_rwfinish
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.endif
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.export _pfs_open, _pfs_read, _pfs_close
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;---------------------------------------------------------------------
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F_EOF = $80
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F_NBLK = $40
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F_OPEN = $20
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F_MAXLEN = 80 ;max filename length
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ST = $90 ;status
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FN = $BB ;filename
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FNL = $B7 ;filenamelength
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LF = $B8 ;logical file number
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SA = $B9 ;secondary address
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OPEN = $FFC0
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CLOSE = $FFC3
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CHKIN = $FFC6
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CHKOUT = $FFC9
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CLRCHN = $FFCC
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CHRIN = $FFCF
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CHROUT = $FFD2
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SETLFS = $FFBA
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SETNAM = $FFBD
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CLALL = $FFE7
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WRITE = $DEF1
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READ = $DEF4
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;---------------------------------------------------------------------
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.data
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illchr: .byte $3A, $2A, $3F, $3D ;illegal chars
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pw: .byte $2C, $50, $2C, $57 ;,p,w
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cmdc: .byte 0
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flags: .res 10
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;---------------------------------------------------------------------
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.segment "INIT"
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init_pfs:
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ldy #F_MAXLEN+8
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jsr subysp ;allocate
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lda #0
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sta FNL ;no name
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ldy #15-1
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jsr open2 ;open command channel
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sta cmdc
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rts
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;---------------------------------------------------------------------
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.code
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error3: jmp error
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_pfs_open:
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sta ptr2
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; Pop and store name
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jsr popax
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sta FN
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stx FN+1 ;filename (kernal)
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ldy #F_MAXLEN+8
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jsr subysp ;allocate name
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ldy #255
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sty ptr3
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sty ptr1
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@L10: iny
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cpy #F_MAXLEN
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bcs error3 ;too long...
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ldx #4 ;4+1 (comma)
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@L12: cmp illchr,x
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beq error3 ;illegal char?
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dex
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bpl @L12
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cmp #$2F
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bne @L11
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sty ptr1 ;last slash
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@L11: lda (FN),y
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bne @L10
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sty FNL
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tay
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tax
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lda #$30 ;this partition
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sta (sp),y
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iny
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inc ptr1
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beq nopath
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lda #$2F
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@L13: sta (sp),y
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iny
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lda (FN,x)
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inc FN
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bne @L14
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inc FN+1
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@L14: cpy ptr1
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bcc @L13
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lda #$2F
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sta (sp),y
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iny
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nopath: lda #$3A
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@L16: sta (sp),y
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iny
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lda (FN,x)
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inc FN
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bne @L15
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inc FN+1
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@L15: ora #0
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bne @L16
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lsr ptr2
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bcs ro ;read only
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lda __filetype
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sta pw+1 ;set filetype
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ldx #252
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@L20: lda pw-252,x
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sta (sp),y ;write
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iny
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inx
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bne @L20
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ro: tya ;name length (kernal)
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ldx sp
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ldy sp+1
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jsr SETNAM
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lda #0 ;file number
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tay ;secondary address
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open2: sta ptr2
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sty ptr2+1
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next: inc ptr2 ;next file number
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ldx ptr2 ;file number
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cpx #11
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bcs error ;no more files
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lda flags-1,x
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bne next ;already used
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lda ptr2+1
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bne nextsa
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inx
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stx ptr2+1
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nextsa: inc ptr2+1 ;next channel
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retr: lda ptr2 ;file number
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ldx curunit
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ldy ptr2+1 ;secondary address
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jsr SETLFS
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jsr OPEN ;open
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bcs oerr
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ldx cmdc
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beq opok ;error channel open
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jsr CHKIN
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bcs error
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jsr CHRIN
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pha
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jsr CHRIN
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sta ptr1
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@L4: jsr CHRIN
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lda ST
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beq @L4
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jsr CLRCHN
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pla
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tax
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lsr
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cmp #$18 ;no serious error
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beq opok
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txa
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pha
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lda ptr2
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jsr CLOSE ;close
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pla
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ldx ptr1
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cmp #$37 ;no channel?
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bne nnoc
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cpx #$30
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bne error ;not no channel
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lda ptr2+1
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cmp #14
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bcc nextsa ;try next channel
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bcs error ;give up
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opok: ldx ptr2
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lda #F_OPEN
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sta flags-1,x
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txa ;ok, return file number
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ldx #0
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ret: ldy #F_MAXLEN+8 ; free filename
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jmp addysp
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oerr: dec ptr2+1
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cmp #2 ;already open,
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beq next ;retry with next
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error: lda #$FF
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tax ;failed
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bne ret
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nnoc: inc ptr3
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bne error ;no retry
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cmp #$36
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bne error ;no exists
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cpx #$33
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bne error
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ldx cmdc
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jsr CHKOUT
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bcs error
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lda FNL
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sec
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sbc #5
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tax
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lda #$53 ;scratch
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jsr CHROUT
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ldy #1
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@L4: lda (FN),y
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iny
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jsr CHROUT
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dex
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bne @L4
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lda #$3D
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jsr CHROUT
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iny
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lda (FN),y
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jsr CHROUT
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lda #$0d
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jsr CHROUT
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jsr CLRCHN
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jmp retr
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.proc _pfs_read
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jsr pfs_rwcommon ; pop params, check handle
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beq error2 ; not open
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bmi eof
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.if F_IDE64
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asl
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bmi nblk ; no block operation
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jsr CHKIN
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bcs error2
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; check support
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jsr ide64_rwprepare
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bcs norm
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; read
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jsr READ
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bcs nosup
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jmp ide64_rwfinish
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nosup: lda #F_NBLK
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jsr pfs_rwsetflags
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.endif
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; Valid lfn. Make it the input file
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nblk: jsr CHKIN
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bcs error2
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; Decrement the count
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norm: ldy #0
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@L3: inc ptr1
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bne @L0
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inc ptr1+1
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beq done ; branch always
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; Read the next byte
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@L0: jsr CHRIN
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tax ; save the input byte
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lda ST ; read the IEEE status
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cmp #1 ; save it
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and #%10111111 ; check anything but the EOI bit
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bne error5 ; assume device not present
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; Store the byte just read
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txa
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sta (ptr2),y
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inc ptr2
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bne @L1
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inc ptr2+1 ; *buf++ = A;
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; Get the status again and check the EOI bit
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@L1: bcc @L3 ; loop if no end of file
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; Set the EOI flag and bail out
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lda #F_EOF
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jsr pfs_rwsetflags
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; Read done, close the input channel
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done: jsr CLRCHN ; clrchn
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; Return the number of chars read
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eof: jmp pfs_rwcommonend
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.endproc
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; Error entry, file is not open
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done_pfs:
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ldx #10
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@L2: ldy flags-1,x ; file open?
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beq @L1
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txa
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jsr _pfs_close
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@L1: dex
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bne @L2
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rts
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error5: jsr CLRCHN ; clrchn
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error2: ldx #255
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txa
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rts
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_pfs_close:
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pha
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jsr CLOSE ;close
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pla
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tax
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lda #0
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sta flags-1,x
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rts
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.proc pfs_rwcommon
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eor #$FF
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sta ptr1
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txa
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eor #$FF
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sta ptr1+1 ; remember -count-1
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jsr popax ; get buf
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sta ptr2
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stx ptr2+1
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sta ptr3
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stx ptr3+1 ; for length
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jsr popax ; get the handle
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sta LF
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lda #0
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beq pfs_rwsetflags
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.endproc
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.if F_IDE64
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.proc ide64_rwprepare
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sec
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lda ptr1+1
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eor #255
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beq small ; too small, not worth it
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tay
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lda ptr1 ; setup registers
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eor #255
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tax
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lda $031B
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eor #$DE
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bne noide ; open vector set?
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lda $DE60
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eor #$49
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bne noide ; check identification
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lda $DE61
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eor #$44
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bne noide
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lda $DE62
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eor #$45
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bne noide
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clc
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lda #ptr2
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small: rts
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noide: lda #F_NBLK
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bne pfs_rwsetflags
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.endproc
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.endif
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.proc pfs_rwsetflags
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ldx LF
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ora flags-1,x
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sta flags-1,x
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rts
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.endproc
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.if F_IDE64
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.proc ide64_rwfinish
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txa
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pha
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tya
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pha
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jsr CLRCHN
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pla
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tax
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pla
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rts
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.endproc
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.endif
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.proc pfs_rwcommonend
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lda ptr2
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sec
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sbc ptr3
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pha
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lda ptr2+1
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sbc ptr3+1
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tax
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pla
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rts
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.endproc
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