852d2c0283
ProDOS requires for each opened file a user-supplied page-aligned 1024 byte i/o buffer. This makes the generic POSIX file i/o library contained in the cc65 C-library quite heavyweight. In contrast the lightweight pfs implementation uses the uIP packet buffer as ProDOS i/o buffer. Therefore: - Only one file may be open at any time. - That file may not be open while the uIP packet buffer is used by uIP. The open()/read()/close() sequence should be completed before Contiki event scheduling or inside handling a single Contiki event. - The uIP packet buffer must be large enough to hold the ProDOS I/O buffer. Depending on the position of the uIP buffer in memory this means between 1024 and 1024 + 256 bytes. Therefore in an Ethernet environment setting the MTU_SIZE to at least 1266 is safe (So the default of 1500 is just fine).
155 lines
3.8 KiB
ArmAsm
155 lines
3.8 KiB
ArmAsm
;
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; Copyright (c) 2008, Swedish Institute of Computer Science.
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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: Oliver Schmidt <ol.sc@web.de>
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;
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; $Id: pfs.S,v 1.1 2008/01/01 18:49:51 oliverschmidt Exp $
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;
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;---------------------------------------------------------------------
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.constructor init_pfs
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.destructor done_pfs
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.importzp ptr1
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.import popax, _uip_buf
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.export _pfs_open, _pfs_read, _pfs_close
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;---------------------------------------------------------------------
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pathname := $0280
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mli := $BF00
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OPEN_CALL = $C8
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READ_CALL = $CA
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CLOSE_CALL = $CC
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;---------------------------------------------------------------------
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.bss
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prefix: .res 1
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;---------------------------------------------------------------------
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.data
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open_param: .byte $03 ;PARAM_COUNT
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.addr pathname ;PATHNAME
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.byte $00 ;IO_BUFFER (Lo)
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.byte >_uip_buf+1 ;IO_BUFFER (Hi)
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open_fd: .byte $00 ;REF_NUM
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read_param: .byte $04 ;PARAM_COUNT
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read_fd: .byte $00 ;REF_NUM
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read_buffer: .addr $0000 ;DATA_BUFFER
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read_count_in: .word $0000 ;REQUEST_COUNT
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read_count_out: .word $0000 ;TRANS_COUNT
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close_param: .byte $01 ;PARAM_COUNT
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close_fd: .byte $00 ;REF_NUM
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;---------------------------------------------------------------------
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.segment "INIT"
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init_pfs:
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; Get prefix len of path used to load binary
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ldx pathname
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: lda pathname,x
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cmp #'/'
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beq :+
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dex
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bne :-
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: stx prefix
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rts
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;---------------------------------------------------------------------
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.code
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_pfs_open:
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; Pop and store name
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jsr popax
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sta ptr1
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stx ptr1+1
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; Append name to prefix
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ldy #$00
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ldx prefix
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: lda (ptr1),y
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beq :+
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sta pathname+1,x
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iny
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inx
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bne :-
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: stx pathname
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jsr mli
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.byte OPEN_CALL
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.addr open_param
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bcs error
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; Return fd
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lda open_fd
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ldx #$00
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rts
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_pfs_read:
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; Store len requested
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sta read_count_in
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stx read_count_in+1
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; Pop and store buf
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jsr popax
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sta read_buffer
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stx read_buffer+1
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; Pop and store fd
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jsr popax
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sta read_fd
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jsr mli
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.byte READ_CALL
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.addr read_param
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bcs error
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; Return len read
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lda read_count_out
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ldx read_count_out+1
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rts
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done_pfs:
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lda #$00
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_pfs_close:
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; Store fd
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sta close_fd
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jsr mli
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.byte CLOSE_CALL
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.addr close_param
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bcs error
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rts
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error:
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; Return -1
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lda #$FF
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tax
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rts
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;---------------------------------------------------------------------
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