459 lines
9.9 KiB
ArmAsm
459 lines
9.9 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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; Author: Greg King <gregdk@users.sf.net>
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;
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;---------------------------------------------------------------------
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.define F_IDE64 1 ; support IDE64, >= $0100 bytes only
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.constructor init_pfs
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.destructor done_pfs
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.importzp sp, ptr1, ptr2, ptr3
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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 cmdc, flags
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.export pfs_makename, pfs_scratch
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.export _pfs_open, _pfs_read, _pfs_close
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;---------------------------------------------------------------------
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MAXLEN = 80 ;maximum filename length
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; Flag bits
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F_EOF = %10000000 ;end of file
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F_NBLK = %01000000 ;block read/write not available
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F_OPEN = %00100000
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; Kernal variables
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ST := $90 ;status
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FN := $BB ;filename
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FNL := $B7 ;filename length
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LF := $B8 ;logical file number
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OPNVec := $031A ;address vector to OPEN function's code
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; IDEDOS function
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READ := $DEF4
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; Kernal functions
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SETLFS := $FFBA
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SETNAM := $FFBD
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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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;---------------------------------------------------------------------
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.data
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; illchr and sw must stay together because the comma, also, is illegal in names.
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illchr: .byte "*?:=" ;illegal chars
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sw: .byte ",s,w"
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cmdc: .byte 0
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flags: .res 10 ;(Kernal allows only ten open files)
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;---------------------------------------------------------------------
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.segment "ONCE"
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init_pfs:
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ldy #MAXLEN + 8
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jsr subysp ;allocate because open2 will free it
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lda #0 ;no name, file number 1
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sta FNL
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ldy #15 - 1 ;secondary address 15
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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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_pfs_open:
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sta ptr2 ;save open-mode flags
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; Get and store name
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jsr popax
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jsr pfs_makename
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lda FNL
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beq error ;must have a filename
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lda #2 - 1 ;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 #.sizeof(flags) + 1
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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 (channel number)
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jsr SETLFS
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jsr OPEN ;open a pair of files (in computer and drive)
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bcs oerr ;branch if could not open computer file
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ldx cmdc
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beq opok ;branch if error channel just was openned
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jsr CHKIN
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bcs error
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jsr CHRIN
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pha ;first digit of error code
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jsr CHRIN
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sta ptr1 ;second digit
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@L4: jsr CHRIN ;flush status message
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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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cmp #'2'
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bcc opok ;no serious error
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pha
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lda ptr2
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jsr CLOSE ;close computer file
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pla
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ldx ptr1
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cmp #'7' ;no channel?
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bne nnoc
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cpx #'0'
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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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ret0: ldx #>$0000
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ret: ldy #MAXLEN + 8 ;free filename space
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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 #<-1
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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 #'6'
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bne error ;not "file exists"
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cpx #'3'
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bne error
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jsr pfs_scratch
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bcc retr
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bcs error ;branch always
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pfs_scratch:
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ldx cmdc
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jsr CHKOUT
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bcs @L5
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ldy #1
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lda #'s' ;scratch
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@L4: jsr CHROUT
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lda (FN),y
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iny
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cmp #','
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bne @L4
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lda #$0D ;carriage return
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jsr CHROUT
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jsr CLRCHN
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clc ;carry = 0: OK
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@L5: rts ;carry = 1: error
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pfs_makename:
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sta FN
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stx FN+1 ;Kernal filename pointer
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ldy #MAXLEN + 8
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jsr subysp ;allocate name space
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; Validate the name; and, find its length
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ldy #<-1
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sty ptr3
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sty ptr1
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@L10: iny
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cpy #MAXLEN
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bcs badchr ;too long
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lda (FN),y
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ldx #.sizeof(illchr); 4 + 1 (includes comma)
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@L12: cmp illchr,x
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beq badchr ;illegal char
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dex
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bpl @L12
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cmp #'/'
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bne @L11
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sty ptr1 ;last slash
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@L11: tax ;test for '\0'
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bne @L10
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cpy #0
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beq badchr ;no name
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tay ;zero index reg.
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lda #'0' ;drive 0 or current 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 #'/'
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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 #'/' ; (.A already has a slash)
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sta (sp),y
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iny
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nopath: lda #':'
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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 #$00 ;test for '\0'
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bne @L16
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lsr ptr2
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bcs ro ;read-only (read-write not supported)
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lda __filetype
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sta sw + 1 ;set filetype
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lsr ptr2
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lda #'w' ;write-only
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lsr ptr2
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bcc write
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lda #'a' ;append
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write: sta sw + 3 ;set mode
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ldx #$0100 - .sizeof(sw)
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@L20: lda sw - ($0100 - .sizeof(sw)),x
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sta (sp),y
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iny
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inx
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bne @L20
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ro: tya ;pathname length
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ldx sp
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ldy sp+1
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namset: jmp SETNAM
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badchr: lda #0
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beq namset
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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 a
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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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; do a block 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
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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 file status
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cmp #$01 ; save it
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and #%10111111 ; check anything but the EOF 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 EOF bit
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@L1: bcc @L3 ; loop if not end of file
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; Set the EOF flag; and, bail out
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lda #F_EOF
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jsr pfs_rwsetflags
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; Read done; cancel the input channel
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done: jsr CLRCHN
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; Return the number of chars read
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eof:
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; jmp pfs_rwcommonend ; (fall through)
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.endproc
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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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done_pfs:
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ldx #.sizeof(flags)
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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 close1
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@L1: dex
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bne @L2
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rts
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error5: jsr CLRCHN
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; Error entry, file is not open
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error2: ldx #>-1
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txa
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rts
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_pfs_close:
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cmp #.sizeof(flags) + 1
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bcs close0 ; don't close if not valid file number
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close1: pha
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jsr CLOSE
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pla
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tax
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lda #$00
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sta flags - 1,x
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close0: rts ; .X = file number
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.proc pfs_rwcommon
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eor #$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 #$00
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; beq pfs_rwsetflags ; (fall through)
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.endproc
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.proc pfs_rwsetflags
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ldx LF
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ora flags - 1,x
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sta flags - 1,x
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rts
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.endproc
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.if F_IDE64
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.proc ide64_rwprepare
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sec ; assume it won't use IDEDOS
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lda ptr1+1
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eor #$FF ; convert -count-1 back to count
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beq small ; too small, not worth it
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tay
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lda ptr1 ; set up registers
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eor #$FF
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tax
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lda OPNVec+1
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eor #>$DE00
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bne noide ; is OPEN vector set to IDEDOS?
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lda $DE60
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eor #'i'
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bne noide ; check identification
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lda $DE61
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eor #'d'
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bne noide
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lda $DE62
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eor #'e'
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bne noide
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clc ; it will use IDEDOS
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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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.proc ide64_rwfinish
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txa ; push .YX
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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 ; pull .XA
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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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