;
; File:
;                           int2f.asm
; Description:
;                 multiplex interrupt support code
;
;                    Copyright (c) 1996, 1998
;                       Pasquale J. Villani
;                       All Rights Reserved
;
; This file is part of DOS-C.
;
; DOS-C is free software; you can redistribute it and/or
; modify it under the terms of the GNU General Public License
; as published by the Free Software Foundation; either version
; 2, or (at your option) any later version.
;
; DOS-C is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
; the GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public
; License along with DOS-C; see the file COPYING.  If not,
; write to the Free Software Foundation, 675 Mass Ave,
; Cambridge, MA 02139, USA.
;
; $Logfile:   D:/dos-c/src/kernel/int2f.asv  $
;
; $Id$
;
; $Log$
; Revision 1.3  2000/05/17 19:15:12  jimtabor
; Cleanup, add and fix source.
;
; Revision 1.2  2000/05/08 04:30:00  jimtabor
; Update CVS to 2020
;
; $Log$
; Revision 1.3  2000/05/17 19:15:12  jimtabor
; Cleanup, add and fix source.
;
; Revision 1.4  2000/03/31 05:40:09  jtabor
; Added Eric W. Biederman Patches
;
; Revision 1.3  2000/03/09 06:07:11  kernel
; 2017f updates by James Tabor
;
; Revision 1.2  1999/08/10 17:57:12  jprice
; ror4 2011-02 patch
;
; Revision 1.1.1.1  1999/03/29 15:40:59  jprice
; New version without IPL.SYS
;
; Revision 1.4  1999/02/08 05:55:57  jprice
; Added Pat's 1937 kernel patches
;
; Revision 1.3  1999/02/01 01:48:41  jprice
; Clean up; Now you can use hex numbers in config.sys. added config.sys screen function to change screen mode (28 or 43/50 lines)
;
; Revision 1.2  1999/01/22 04:13:26  jprice
; Formating
;
; Revision 1.1.1.1  1999/01/20 05:51:01  jprice
; Imported sources
;
;
;    Rev 1.2   06 Dec 1998  8:48:12   patv
; Bug fixes.
;
;    Rev 1.1   29 May 1996 21:03:46   patv
; bug fixes for v0.91a
;
;    Rev 1.0   19 Feb 1996  3:34:38   patv
; Initial revision.
; $EndLog$
;

		%include "segs.inc"

segment	_TEXT
            extern _nul_dev:wrt DGROUP

                global  _int2f_handler
_int2f_handler:
                sti                             ; Enable interrupts
                cmp     ah,11h                  ; Network interrupt?
                jne     Int2f3                  ; No, continue
Int2f1:
                or      al,al                   ; Installation check?
                jz      FarTabRetn              ; yes, just return
Int2f2:
                stc
FarTabRetn:
                retf    2                       ; Return far
Int2f3:
                cmp     ah,16h
                je      FarTabRetn              ; Win Hook return fast
                cmp     ah,12h
                je      IntDosCal               ; Dos Internal calls
                cmp     ah,10h                  ; SHARE.EXE interrupt?
                je      Int2f1                  ; yes, do installation check
                cmp     ah,14h                  ; NLSFUNC.EXE interrupt?
                je      Int2f1                  ; yes, do installation check
                iret                            ; Default, interrupt return

;
;   added by James Tabor For Zip Drives
;Return Null Device Pointer
IntDosCal:
                cmp     al,02ch
                jne     Int2f2
                mov     ax,_nul_dev
                mov     bx,seg _nul_dev
                clc
                jmp     FarTabRetn

; Int 2F Multipurpose Remote System Calls
;
; added by James Tabor jimtabor@infohwy.com
;
; int_2f_Remote_call(ax,bx,cx,dx,[es:di],si, return data * ptr)
; assume ss == ds after setup of stack in entry
; sumtimes return data *ptr is the push stack word
;
                global  _int2f_Remote_call
_int2f_Remote_call:
                push    bp
                mov     bp,sp
                push    es
                push    ds
                push    si
                push    di
                push    dx
                push    cx
                push    bx

                push    ss              ; hay, did I say assume
                pop     ds

                mov     si,[bp+16]
                les     di,[bp+12]
                mov     dx,[bp+10]
                mov     cx,[bp+8]
                mov     bx,[bp+6]
                mov     ax,[bp+4]

                cmp     al,08h              ; R/W Remote File
                je      short int2f_r_1
                cmp     al,09h
                jne     short int2f_r_2
int2f_r_1:
                call    int2f_call
                jnc     short int2f_skip1
                jmp     int2f_rfner
int2f_skip1:
                les     di,[bp+18]          ; do return data stuff
                mov     [es:di],cx
                jmp     short int2f_rfner
int2f_r_2:
                cmp     al,0ch              ; Get Remote DPB
                jne     short int2f_r_3
                call    int2f_call
                jc      int2f_rfner
                les     di,[bp+18]
                mov     [es:di+0],ax
                mov     [es:di+2],bx
                mov     [es:di+4],cx
                mov     [es:di+6],dx
                jmp     short int2f_rfner
int2f_r_3:
                cmp     al,0fh              ; Get Remote File Attrib
                jne     short int2f_r_4
                call    int2f_call
                jc      short int2f_rfner
                mov     si,di
                les     di,[bp+18]      ; pointer to struct
                mov     [es:di+0],ax
                mov     [es:di+2],si    ; lo
                mov     [es:di+4],bx    ; high
                mov     [es:di+6],cx
                mov     [es:di+8],dx
                mov     ax,0000h
                jmp     short int2f_rfner
int2f_r_4:
                cmp     al,01eh
                je      short int2f_r_5
                cmp     al,01fh
                jne     short int2f_r_6
int2f_r_5:
                push    ds
                push    word [bp+20]
                pop     ds
                call    int2f_call
                pop     ds
                jc      short int2f_rfner
                xor     ax,ax
                jmp     short int2f_rfner
int2f_r_6:
                cmp     al,021h             ; Lseek from eof
                jne     short int2f_r_7
                call    int2f_call
                jc      short int2f_rfner
                les     di,[bp+18]
                mov     [es:di],ax
                mov     [es:di+2],dx
                xor     ax,ax
                jmp     short int2f_rfner
int2f_r_7:
;
;   everything else goes through here.
;
                call    int2f_call
                jc	int2f_rfner
                xor	ax,ax
int2f_rfner:
                pop     bx
                pop     cx
                pop     dx
                pop     di
                pop     si
                pop     ds
                pop     es
                pop     bp
                ret
;
;  Pull this one out of the Chain.
;
                global  _QRemote_Fn
_QRemote_Fn
                push    bp
                mov     bp,sp
                push    es
                push    ds
                push    si
                push    di
                mov     ax,1123h
                lds     si,[bp+4]
                les     di,[bp+8]
                stc
                int     2fh
                mov	ax,0xffff
                jnc	QRemote_Fn_out
                xor	ax,ax
QRemote_Fn_out:	
                pop     di
                pop     si
                pop     ds
                pop     es
                pop     bp
                ret


int2f_call:
                push    bp
                push    word [bp+18]    ; very fakey, HaHa ;)
                stc                     ; set to fail
                int     2fh
                pop     bp
                pop     bp
                ret