2000-05-06 21:34:20 +02:00
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;
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; File:
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; io.asm
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; Description:
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; DOS-C I/O Subsystem
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;
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; Copyright (c) 1998
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; Pasquale J. Villani
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; All Rights Reserved
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;
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; This file is part of DOS-C.
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;
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; DOS-C is free software; you can redistribute it and/or
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; modify it under the terms of the GNU General Public License
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; as published by the Free Software Foundation; either version
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; 2, or (at your option) any later version.
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;
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; DOS-C is distributed in the hope that it will be useful, but
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; WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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; the GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public
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; License along with DOS-C; see the file COPYING. If not,
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; write to the Free Software Foundation, 675 Mass Ave,
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; Cambridge, MA 02139, USA.
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;
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; $Header$
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;
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; $Log$
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2001-04-22 00:32:53 +02:00
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; Revision 1.8 2001/04/21 22:32:53 bartoldeman
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; Init DS=Init CS, fixed stack overflow problems and misc bugs.
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;
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2001-03-21 03:56:26 +01:00
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; Revision 1.7 2001/03/21 02:56:26 bartoldeman
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; See history.txt for changes. Bug fixes and HMA support are the main ones.
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;
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2000-06-21 20:16:46 +02:00
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; Revision 1.6 2000/06/21 18:16:46 jimtabor
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; Add UMB code, patch, and code fixes
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;
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2000-06-01 08:37:38 +02:00
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; Revision 1.5 2000/06/01 06:37:38 jimtabor
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; Read History for Changes
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;
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2000-05-26 21:25:19 +02:00
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; Revision 1.4 2000/05/26 19:25:19 jimtabor
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; Read History file for Change info
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;
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2000-05-25 22:56:23 +02:00
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; Revision 1.3 2000/05/25 20:56:21 jimtabor
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; Fixed project history
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;
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2000-05-08 06:30:00 +02:00
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; Revision 1.2 2000/05/08 04:30:00 jimtabor
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; Update CVS to 2020
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2000-05-06 21:34:20 +02:00
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;
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2000-05-25 22:56:23 +02:00
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; Revision 1.1.1.1 2000/05/06 19:34:53 jhall1
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; The FreeDOS Kernel. A DOS kernel that aims to be 100% compatible with
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; MS-DOS. Distributed under the GNU GPL.
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;
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2000-05-06 21:34:20 +02:00
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; Revision 1.3 2000/03/09 06:07:11 kernel
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; 2017f updates by James Tabor
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;
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; Revision 1.2 1999/08/10 17:57:12 jprice
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; ror4 2011-02 patch
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;
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; Revision 1.1.1.1 1999/03/29 15:41:07 jprice
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; New version without IPL.SYS
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;
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; Revision 1.1 1999/02/08 05:55:57 jprice
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; Added Pat's 1937 kernel patches
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;
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; $EndLog$
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;
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%include "segs.inc"
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extern ConTable:wrt TGROUP
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extern LptTable:wrt TGROUP
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extern ComTable:wrt TGROUP
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extern uPrtNo:wrt TGROUP
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extern CommonNdRdExit:wrt TGROUP
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extern _NumFloppies:wrt DGROUP
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extern blk_stk_top:wrt DGROUP
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extern clk_stk_top:wrt DGROUP
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2001-03-21 03:56:26 +01:00
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extern _reloc_call_blk_driver
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extern _reloc_call_clk_driver
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2000-05-06 21:34:20 +02:00
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;---------------------------------------------------
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;
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; Device entry points
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;
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; This really should be a struct and go into a request.inc file
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;
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cmdlen equ 0 ; Length of this command
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unit equ 1 ; Subunit Specified
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cmd equ 2 ; Command Code
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status equ 3 ; Status
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media equ 13 ; Media Descriptor
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trans equ 14 ; Transfer Address
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count equ 18 ; Count of blocks or characters
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start equ 20 ; First block to transfer
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vid equ 22 ; Volume id pointer
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huge equ 26 ; First block (32-bit) to transfer
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;
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; The following is the "array" of device driver headers for the internal
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; devices. There is one header per device including special aux: and prn:
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; pseudo devices. These psuedo devices are necessary for printer
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; redirection, i.e., serial or parallel ports, and com port aux selection.
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;
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; The devices are linked into each other and terminate with a -1 next
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; pointer. This saves some time on boot up and also allows us to throw all
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; device initialization into a single io_init function that may be placed
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; into a discardable code segmemnt.
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;
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segment _IO_FIXED_DATA
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;
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; The "CON" device
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;
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; This device is the standard console device used by
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; DOS-C and kernel
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;
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global _con_dev
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_con_dev equ $
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dw _prn_dev,TGROUP
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dw 8013h ; con device (stdin & stdout)
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dw GenStrategy
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dw ConIntr
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db 'CON '
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;
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; Generic prn device that can be redirected via mode
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;
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global _prn_dev
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_prn_dev dw _aux_dev,TGROUP
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dw 0A040h
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dw GenStrategy
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dw PrnIntr
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db 'PRN '
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;
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; Generic aux device that can be redirected via mode
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;
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global _aux_dev
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_aux_dev dw _Lpt1Dev,TGROUP
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dw 8000h
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dw GenStrategy
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dw AuxIntr
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db 'AUX '
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;
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; Printer device drivers
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;
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_Lpt1Dev dw _Lpt2Dev,TGROUP
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dw 0A040h
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dw GenStrategy
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dw Lpt1Intr
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db 'LPT1 '
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_Lpt2Dev dw _Lpt3Dev,TGROUP
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dw 0A040h
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dw GenStrategy
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dw Lpt2Intr
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db 'LPT2 '
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_Lpt3Dev dw _Com1Dev,TGROUP
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dw 0A040h
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dw GenStrategy
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dw Lpt3Intr
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db 'LPT3 '
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;
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; Com device drivers
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;
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_Com1Dev dw _Com2Dev,TGROUP
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dw 8000h
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dw GenStrategy
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dw AuxIntr
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db 'COM1 '
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_Com2Dev dw _Com3Dev,TGROUP
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dw 8000h
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dw GenStrategy
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dw Com2Intr
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db 'COM2 '
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_Com3Dev dw _Com4Dev,TGROUP
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dw 8000h
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dw GenStrategy
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dw Com3Intr
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db 'COM3 '
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_Com4Dev dw _clk_dev,TGROUP
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dw 8000h
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dw GenStrategy
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dw Com4Intr
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db 'COM4 '
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;
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; Header for clock device
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;
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global _clk_dev
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_clk_dev equ $
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dw _blk_dev,TGROUP
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2001-04-22 00:32:53 +02:00
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dw 8008h ; clock device
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2000-05-06 21:34:20 +02:00
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dw GenStrategy
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dw clk_entry
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db 'CLOCK$ '
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;
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; Header for device
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;
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global _blk_dev
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_blk_dev equ $
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dd -1
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2000-06-01 08:37:38 +02:00
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dw 08c2h ; block device with ioctl
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2000-05-06 21:34:20 +02:00
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dw GenStrategy
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dw blk_entry
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global _nblk_rel
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_nblk_rel db 4
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db 0,0,0,0,0,0,0
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;
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; Temporary table until next release
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;
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segment _IO_FIXED_DATA
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DiskTable db 0
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;
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; Local storage
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;
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segment _BSS
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blk_dos_stk resw 1
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blk_dos_seg resw 1
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clk_dos_stk resw 1
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clk_dos_seg resw 1
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2001-03-21 03:56:26 +01:00
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segment _IO_TEXT
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2000-05-06 21:34:20 +02:00
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global _ReqPktPtr
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_ReqPktPtr dd 0
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uUnitNumber dw 0
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2001-03-21 03:56:26 +01:00
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2000-05-06 21:34:20 +02:00
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;
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; Name:
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; GenStrategy
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;
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; Function:
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; Store the pointer to the request packet passed in es:bx
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;
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; Description:
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; Generic strategy routine. Unlike the original multitasking versions,
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; this version assumes that no more thank one device driver is active
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; at any time. The request is stored into memory in the one and only
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; location available for that purpose.
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;
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GenStrategy:
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mov word [cs:_ReqPktPtr],bx
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mov word [cs:_ReqPktPtr+2],es
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retf
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;
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; Name:
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; XXXXIntr
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;
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; Function:
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; Individual Interrupt routines for each device driver
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;
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; Description:
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; This is actually a single routine with entry points for each device.
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; The name used for the entry point is the device name with Intr
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; appended to it.
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;
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; Funtionally, each device driver has an entry and an associated
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; table. The table is a structure that consists of a control byte
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; followed by an array of pointers to C functions or assembly
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; subroutines that implement the individual device driver functions.
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; This allows the usage of common error dummy filler code to be used.
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; It also allows standardization of the calling procedure for these
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; internal device driver functions.
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;
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; Assembler call/return convention:
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; Each driver function is entered by a jump into the function and
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; exits by a jump to the appropriate success or error exit routine.
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; This speeds up the call and return and helps to minimize the stack
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; useage. The contents of the request packet are passed to each
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; routine in registers as follows:
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;
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; Register Function Description
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; -------- -------- -----------
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; al unit Subunit Specified
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; ah media Media Descriptor
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; cx count Count of blocks or characters
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; dx start First block to transfer
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; es:di trans Transfer Address
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; ds:bx reqptr Request pointer
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; cs kernel code segment
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; ds kernel data segment
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;
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; The exit routines generally set the status based on the individual
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; routine. For example, _IOSuccess will clear the count where
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; _IOErrCnt will subtract the remaining amount in cx from the original
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; count. See each utility routine for expectations.
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;
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; C call/return convention:
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; The C calling convention simply sets up the C stack and passes the
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; request packet pointer as a far pointer to the function. Although
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; the utility routine names are such that they are accesible from the
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; C name space, they are cannot used. Instead, the common interrupt
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; code expects a return status to set in the request packet. It is up
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; to the device driver function to set the appropriate fields such as
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; count when an error occurs.
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;
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; How to differntiate between the two calling conventions:
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; This code is entirely table driven. The table is a structure that
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; is generally in the _IO_FIXED_DATA segment. It consists of a flag
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; byte followed by short pointers to the driver functions. Selecting
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; a driver type is accomplished by setting the type bit in the flag
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; (see below).
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;
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; 7 6 5 4 3 2 1 0
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; +---+---+---+---+---+---+---+---+
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; | | | | | | | | |
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; +---+---+---+---+---+---+---+---+
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; | | | |--- Number of table entries
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; | | +-------------------+
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; | | |----------------------- Reserved
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; | +-------+
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; +--------------------------------- type bit (1 == C / 0 == asm)
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;
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ConIntr:
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push si
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mov si,ConTable
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jmp short CharIntrEntry
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PrnIntr:
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push si
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push ax
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|
xor ax,ax
|
|
|
|
|
jmp short LptCmnIntr
|
|
|
|
|
|
|
|
|
|
Lpt1Intr:
|
|
|
|
|
push si
|
|
|
|
|
push ax
|
|
|
|
|
xor al,al
|
|
|
|
|
mov ah,1
|
|
|
|
|
jmp short LptCmnIntr
|
|
|
|
|
|
|
|
|
|
Lpt2Intr:
|
|
|
|
|
push si
|
|
|
|
|
push ax
|
|
|
|
|
mov al,1
|
|
|
|
|
mov ah,2
|
|
|
|
|
jmp short LptCmnIntr
|
|
|
|
|
|
|
|
|
|
Lpt3Intr:
|
|
|
|
|
push si
|
|
|
|
|
push ax
|
|
|
|
|
mov al,2
|
|
|
|
|
mov ah,3
|
|
|
|
|
|
|
|
|
|
LptCmnIntr:
|
|
|
|
|
mov si,LptTable
|
|
|
|
|
mov [cs:uPrtNo],ah
|
|
|
|
|
jmp short DiskIntrEntry
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
AuxIntr:
|
|
|
|
|
push si
|
|
|
|
|
push ax
|
|
|
|
|
xor al,al
|
|
|
|
|
jmp short ComCmnIntr
|
|
|
|
|
|
|
|
|
|
Com2Intr:
|
|
|
|
|
push si
|
|
|
|
|
push ax
|
|
|
|
|
mov al,1
|
|
|
|
|
jmp short ComCmnIntr
|
|
|
|
|
|
|
|
|
|
Com3Intr:
|
|
|
|
|
push si
|
|
|
|
|
push ax
|
|
|
|
|
mov al,2
|
|
|
|
|
jmp short ComCmnIntr
|
|
|
|
|
|
|
|
|
|
Com4Intr:
|
|
|
|
|
push si
|
|
|
|
|
push ax
|
|
|
|
|
mov al,3
|
|
|
|
|
jmp short ComCmnIntr
|
|
|
|
|
|
|
|
|
|
ComCmnIntr:
|
|
|
|
|
mov si,ComTable
|
|
|
|
|
jmp short DiskIntrEntry
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
DskIntr:
|
|
|
|
|
push si
|
|
|
|
|
mov si,DiskTable
|
|
|
|
|
CharIntrEntry:
|
|
|
|
|
push ax
|
|
|
|
|
DiskIntrEntry:
|
|
|
|
|
push cx
|
|
|
|
|
push dx
|
|
|
|
|
push di
|
|
|
|
|
push bp
|
|
|
|
|
push ds
|
|
|
|
|
push es
|
|
|
|
|
push bx
|
|
|
|
|
mov byte [cs:uUnitNumber],al
|
|
|
|
|
lds bx,[cs:_ReqPktPtr]
|
|
|
|
|
test byte [cs:si],80h
|
|
|
|
|
je AsmType
|
|
|
|
|
|
|
|
|
|
mov al,[bx+cmd]
|
|
|
|
|
cmp al,[cs:si]
|
|
|
|
|
ja _IOCommandError
|
|
|
|
|
cbw
|
|
|
|
|
shl ax,1
|
|
|
|
|
add si,ax
|
|
|
|
|
xchg di,ax
|
|
|
|
|
|
|
|
|
|
push ds
|
|
|
|
|
push bx
|
|
|
|
|
mov bp,sp
|
2001-03-21 03:56:26 +01:00
|
|
|
push ax
|
|
|
|
|
mov ax,DGROUP
|
|
|
|
|
mov ds,ax
|
|
|
|
|
pop ax
|
2000-05-06 21:34:20 +02:00
|
|
|
cld
|
|
|
|
|
call word [cs:si+1]
|
|
|
|
|
pop cx
|
|
|
|
|
pop cx
|
|
|
|
|
jmp short StoreStatus
|
|
|
|
|
|
|
|
|
|
AsmType: mov al,[bx+unit]
|
|
|
|
|
mov ah,[bx+media]
|
|
|
|
|
mov cx,[bx+count]
|
|
|
|
|
mov dx,[bx+start]
|
|
|
|
|
xchg di,ax
|
|
|
|
|
mov al,[bx+cmd]
|
|
|
|
|
cmp al,[cs:si]
|
|
|
|
|
ja _IOCommandError
|
|
|
|
|
cbw
|
|
|
|
|
shl ax,1
|
|
|
|
|
add si,ax
|
|
|
|
|
xchg di,ax
|
|
|
|
|
|
|
|
|
|
les di,[bx+trans]
|
2001-03-21 03:56:26 +01:00
|
|
|
push ax
|
|
|
|
|
mov ax, DGROUP
|
2000-05-06 21:34:20 +02:00
|
|
|
mov ds,ax
|
2001-03-21 03:56:26 +01:00
|
|
|
pop ax
|
2000-05-06 21:34:20 +02:00
|
|
|
cld
|
|
|
|
|
jmp word [cs:si+1]
|
|
|
|
|
|
|
|
|
|
;
|
|
|
|
|
; Name:
|
|
|
|
|
; _IOXXXXXXX
|
|
|
|
|
;
|
|
|
|
|
; Function:
|
|
|
|
|
; Exit routines for internal device drivers.
|
|
|
|
|
;
|
|
|
|
|
; Description:
|
|
|
|
|
; These routines are the exit for internal device drivers. _IOSuccess
|
|
|
|
|
; is for read/write functions and correctly returns for a successful
|
|
|
|
|
; read/write operation by setting the remainng count to zero. _IOExit
|
|
|
|
|
; simply sets success bit and returns. _IODone returns complete and
|
|
|
|
|
; busy status. _IOCommandError returns and error status for invalid
|
|
|
|
|
; commands. _IOErrCnt corrects the remaining bytes for errors that
|
|
|
|
|
; occurred during partial read/write operation. _IOErrorExit is a
|
|
|
|
|
; generic error exit that sets done and error.
|
|
|
|
|
;
|
|
|
|
|
global _IOSuccess
|
|
|
|
|
_IOSuccess:
|
|
|
|
|
lds bx,[cs:_ReqPktPtr]
|
|
|
|
|
xor ax,ax
|
|
|
|
|
mov [bx+count],ax
|
|
|
|
|
|
|
|
|
|
global _IOExit
|
|
|
|
|
_IOExit:
|
|
|
|
|
mov ah,1
|
|
|
|
|
|
|
|
|
|
StoreStatus:
|
|
|
|
|
lds bx,[cs:_ReqPktPtr]
|
|
|
|
|
mov [bx+status],ax
|
|
|
|
|
pop bx
|
|
|
|
|
pop es
|
|
|
|
|
pop ds
|
|
|
|
|
pop bp
|
|
|
|
|
pop di
|
|
|
|
|
pop dx
|
|
|
|
|
pop cx
|
|
|
|
|
pop ax
|
|
|
|
|
pop si
|
|
|
|
|
retf
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
global _IODone
|
|
|
|
|
_IODone:
|
|
|
|
|
mov ah,3
|
|
|
|
|
jmp short StoreStatus
|
|
|
|
|
|
|
|
|
|
global _IOCommandError
|
|
|
|
|
_IOCommandError:
|
|
|
|
|
mov al,3
|
|
|
|
|
|
|
|
|
|
global _IOErrCnt
|
|
|
|
|
_IOErrCnt:
|
|
|
|
|
lds bx,[cs:_ReqPktPtr]
|
|
|
|
|
sub [bx+count],cx
|
|
|
|
|
global _IOErrorExit
|
|
|
|
|
_IOErrorExit:
|
|
|
|
|
mov ah,81h
|
|
|
|
|
jmp short StoreStatus
|
|
|
|
|
|
|
|
|
|
;
|
|
|
|
|
; Name:
|
|
|
|
|
; GetUnitNum
|
|
|
|
|
;
|
|
|
|
|
; Function:
|
|
|
|
|
; Return the internally set unit number.
|
|
|
|
|
;
|
|
|
|
|
; Description:
|
|
|
|
|
; Simply return the contents of uUnitNumber. This version relies on
|
|
|
|
|
; no segment registers and makes a safe call regardless of driver
|
|
|
|
|
; state.
|
|
|
|
|
;
|
|
|
|
|
global GetUnitNum
|
|
|
|
|
GetUnitNum:
|
|
|
|
|
mov dx,[cs:uUnitNumber]
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
;
|
|
|
|
|
; These are still old style DOS-C drivers. I'll replace
|
|
|
|
|
; them in the next release
|
|
|
|
|
;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;
|
|
|
|
|
; block device interrupt
|
|
|
|
|
;
|
|
|
|
|
; NOTE: This code is not standard device driver handlers
|
|
|
|
|
; It is written for sperate code and data space.
|
|
|
|
|
;
|
|
|
|
|
blk_entry:
|
|
|
|
|
pushf
|
|
|
|
|
push ax
|
|
|
|
|
push bx
|
|
|
|
|
push ds
|
2001-04-22 00:32:53 +02:00
|
|
|
|
2001-03-21 03:56:26 +01:00
|
|
|
|
2000-05-06 21:34:20 +02:00
|
|
|
; small model
|
2001-03-21 03:56:26 +01:00
|
|
|
mov ax,DGROUP ; correct for segments
|
2000-05-06 21:34:20 +02:00
|
|
|
mov ds,ax ; ax to carry segment
|
|
|
|
|
mov word [blk_dos_stk],sp ; use internal stack
|
|
|
|
|
mov word [blk_dos_seg],ss
|
|
|
|
|
pushf ; put flags in bx
|
|
|
|
|
pop bx
|
|
|
|
|
cli ; no interrupts
|
|
|
|
|
mov ss,ax
|
|
|
|
|
mov sp,blk_stk_top
|
|
|
|
|
push bx
|
|
|
|
|
popf ; restore interrupt flag
|
2001-04-22 00:32:53 +02:00
|
|
|
|
|
|
|
|
|
|
|
|
|
push cx ; push these registers on
|
|
|
|
|
push dx ; BLK_STACK
|
|
|
|
|
push bp ; to save stack space
|
|
|
|
|
push si
|
|
|
|
|
push di
|
|
|
|
|
push es
|
|
|
|
|
|
|
|
|
|
|
2000-05-06 21:34:20 +02:00
|
|
|
push word [cs:_ReqPktPtr+2]
|
|
|
|
|
push word [cs:_ReqPktPtr]
|
2001-03-21 03:56:26 +01:00
|
|
|
call far _reloc_call_blk_driver
|
2000-05-06 21:34:20 +02:00
|
|
|
pop cx
|
|
|
|
|
pop cx
|
2001-04-22 00:32:53 +02:00
|
|
|
|
2000-05-06 21:34:20 +02:00
|
|
|
les bx,[cs:_ReqPktPtr] ; now return completion code
|
2000-06-21 20:16:46 +02:00
|
|
|
mov word [es:bx+status],ax ; mark operation complete
|
2001-04-22 00:32:53 +02:00
|
|
|
|
|
|
|
|
|
2000-05-06 21:34:20 +02:00
|
|
|
pop es
|
|
|
|
|
pop di
|
|
|
|
|
pop si
|
|
|
|
|
pop bp
|
|
|
|
|
pop dx
|
|
|
|
|
pop cx
|
2001-04-22 00:32:53 +02:00
|
|
|
|
|
|
|
|
cli ; no interrupts
|
|
|
|
|
mov sp,[blk_dos_stk] ; use dos stack
|
|
|
|
|
mov ss,[blk_dos_seg]
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
pop ds
|
2000-05-06 21:34:20 +02:00
|
|
|
pop bx
|
|
|
|
|
pop ax
|
|
|
|
|
popf
|
|
|
|
|
retf
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2001-03-21 03:56:26 +01:00
|
|
|
|
|
|
|
|
|
2000-05-06 21:34:20 +02:00
|
|
|
;
|
|
|
|
|
; clock device interrupt
|
|
|
|
|
;
|
|
|
|
|
; NOTE: This code is not standard device driver handlers
|
|
|
|
|
; It is written for sperate code and data space.
|
|
|
|
|
;
|
|
|
|
|
clk_entry:
|
|
|
|
|
pushf
|
|
|
|
|
push ax
|
|
|
|
|
push bx
|
|
|
|
|
push cx
|
|
|
|
|
push dx
|
|
|
|
|
push bp
|
|
|
|
|
push si
|
|
|
|
|
push di
|
|
|
|
|
push ds
|
|
|
|
|
push es
|
2001-03-21 03:56:26 +01:00
|
|
|
|
2000-05-06 21:34:20 +02:00
|
|
|
; small model
|
2001-03-21 03:56:26 +01:00
|
|
|
mov ax,DGROUP ; correct for segments
|
2000-05-06 21:34:20 +02:00
|
|
|
mov ds,ax ; ax to carry segment
|
|
|
|
|
mov word [clk_dos_stk],sp ; use internal stack
|
|
|
|
|
mov word [clk_dos_seg],ss
|
|
|
|
|
pushf ; put flags in bx
|
|
|
|
|
pop bx
|
|
|
|
|
cli ; no interrupts
|
|
|
|
|
mov ss,ax
|
|
|
|
|
mov sp,clk_stk_top
|
|
|
|
|
push bx
|
|
|
|
|
popf ; restore interrupt flag
|
|
|
|
|
mov bp,sp ; make a c frame
|
|
|
|
|
push word [cs:_ReqPktPtr+2]
|
|
|
|
|
push word [cs:_ReqPktPtr]
|
2001-03-21 03:56:26 +01:00
|
|
|
call far _reloc_call_clk_driver
|
2000-05-06 21:34:20 +02:00
|
|
|
pop cx
|
|
|
|
|
pop cx
|
|
|
|
|
les bx,[cs:_ReqPktPtr] ; now return completion code
|
|
|
|
|
mov word [es:bx+status],ax ; mark operation complete
|
|
|
|
|
cli ; no interrupts
|
|
|
|
|
mov sp,[clk_dos_stk] ; use dos stack
|
|
|
|
|
mov ss,[clk_dos_seg]
|
|
|
|
|
pop es
|
|
|
|
|
pop ds
|
|
|
|
|
pop di
|
|
|
|
|
pop si
|
|
|
|
|
pop bp
|
|
|
|
|
pop dx
|
|
|
|
|
pop cx
|
|
|
|
|
pop bx
|
|
|
|
|
pop ax
|
|
|
|
|
popf
|
|
|
|
|
retf
|
|
|
|
|
|
