; ; File: ; floppy.asm ; Description: ; floppy disk driver primitives ; ; Copyright (c) 1995 ; 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: C:/usr/patv/dos-c/src/drivers/floppy.asv $ ; ; $Id$ ; ; $Log$ ; Revision 1.4 2001/03/21 02:56:25 bartoldeman ; See history.txt for changes. Bug fixes and HMA support are the main ones. ; ; Revision 1.3 2000/05/25 20:56:19 jimtabor ; Fixed project history ; ; Revision 1.2 2000/05/11 03:56:20 jimtabor ; Clean up and Release ; ; Revision 1.1.1.1 2000/05/06 19:34:53 jhall1 ; The FreeDOS Kernel. A DOS kernel that aims to be 100% compatible with ; MS-DOS. Distributed under the GNU GPL. ; ; Revision 1.4 1999/08/10 17:21:08 jprice ; ror4 2011-01 patch ; ; Revision 1.3 1999/04/16 21:29:17 jprice ; ror4 multi-sector IO ; ; Revision 1.2 1999/03/29 17:08:31 jprice ; ror4 changes ; ; Revision 1.1.1.1 1999/03/29 15:40:24 jprice ; New version without IPL.SYS ; ; Revision 1.4 1999/02/14 04:25:16 jprice ; Added functions to check if a floppy disk has been changed. ; ; Revision 1.3 1999/02/08 05:49:47 jprice ; Added Pat's 1937 kernel patches ; ; Revision 1.2 1999/01/22 04:16:39 jprice ; Formating ; ; Revision 1.1.1.1 1999/01/20 05:51:00 jprice ; Imported sources ; ; Rev 1.3 06 Dec 1998 8:43:00 patv ;New floppy support functions. ; ; Rev 1.2 29 Aug 1996 13:07:14 patv ;Bug fixes for v0.91b ; ; Rev 1.1 01 Sep 1995 18:50:34 patv ;Initial GPL release. ; ; Rev 1.0 02 Jul 1995 7:57:02 patv ;Initial revision. ; %include "..\kernel\segs.inc" segment HMA_TEXT ; ; ; Reset both the diskette and hard disk system ; ; BOOL fl_reset(WORD drive) ; ; returns TRUE if successful ; global _fl_reset _fl_reset: mov bx,sp mov ah,0 ; BIOS reset disketter & fixed disk mov dl,[bx+2] int 13h jc fl_rst1 ; cy==1 is error mov ax,1 ; TRUE on success ret fl_rst1: xor ax,ax ; FALSE on error ret ; ; ; Read DASD Type ; ; COUNT fl_readdasd(WORD drive) ; ; returns 0-3 if successful, 0xFF if error ; ; Code Meaning ; 0 The drive is not present ; 1 Drive present, cannot detect disk change ; 2 Drive present, can detect disk change ; 3 Fixed disk ; global _fl_readdasd _fl_readdasd: push bp mov bp,sp mov dl,[bp+4] ; get the drive number mov ah,15h ; read DASD type int 13h jc fl_rdasd1 ; cy==1 is error mov al,ah ; for the return code xor ah,ah pop bp ; C exit ret fl_rdasd1: mov ah,0 ; BIOS reset disketter & fixed disk int 13h mov ax,0FFh ; 0xFF on error pop bp ; C exit ret ; ; ; Read disk change line status ; ; COUNT fl_diskchanged(WORD drive) ; ; returns 1 if disk has changed, 0 if not, 0xFF if error ; global _fl_diskchanged _fl_diskchanged: push bp ; C entry mov bp,sp mov dl,[bp+4] ; get the drive number mov ah,16h ; read change status type int 13h jc fl_dchanged1 ; cy==1 is error or disk has changed xor ax,ax ; disk has not changed pop bp ; C exit ret fl_dchanged1: cmp ah,6 jne fl_dc_error mov ax,1 pop bp ; C exit ret fl_dc_error: mov ax,0FFh ; 0xFF on error pop bp ; C exit ret ; ; Read the disk system status ; ; COUNT fl_rd_status(WORD drive) ; ; Returns error codes ; ; See Phoenix Bios Book for error code meanings ; global _fl_rd_status _fl_rd_status: push bp ; C entry mov bp,sp mov dl,[bp+4] ; get the drive number mov ah,1 ; read status int 13h mov al,ah ; for the return code xor ah,ah pop bp ; C exit ret ; ; Read Sectors ; ; COUNT fl_read(WORD drive, WORD head, WORD track, WORD sector, WORD count, BYTE FAR *buffer); ; ; Reads one or more sectors. ; ; Returns 0 if successful, error code otherwise. ; ; ; Write Sectors ; ; COUNT fl_write(WORD drive, WORD head, WORD track, WORD sector, WORD count, BYTE FAR *buffer); ; ; Writes one or more sectors. ; ; Returns 0 if successful, error code otherwise. ; global _fl_read _fl_read: mov ah,2 ; cmd READ jmp short fl_common global _fl_verify _fl_verify: mov ah,4 ; cmd verify jmp short fl_common global _fl_write _fl_write: mov ah,3 ; cmd WRITE fl_common: push bp ; C entry mov bp,sp mov dl,[bp+4] ; get the drive (if or'ed 80h its ; hard drive. mov dh,[bp+6] ; get the head number mov bx,[bp+8] ; cylinder number (lo only if hard) mov al,1 ; this should be an error code cmp bx,3ffh ; this code can't write above 3ff=1023 ja fl_error mov ch,bl ; low 8 bits of cyl number xor bl,bl ; extract bits 8+9 to cl shr bx,1 shr bx,1 mov cl,[bp+0Ah] ; sector number and cl,03fh ; mask to sector field bits 5-0 or cl,bl ; or in bits 7-6 mov al,[bp+0Ch] ; count to read/write les bx,[bp+0Eh] ; Load 32 bit buffer ptr int 13h ; write sectors from mem es:bx mov al,ah jc fl_wr1 ; error, return error code xor al,al ; Zero transfer count fl_wr1: fl_error: xor ah,ah ; force into < 255 count pop bp ret global _fl_format _fl_format: xor ax,ax ret ; ; ; Get number of disks ; ; COUNT fl_nrdrives(VOID) ; ; returns AX = number of harddisks ; global _fl_nrdrives _fl_nrdrives: push di ; di reserved by C-code ??? mov ah,8 ; DISK, get drive parameters mov dl,80h int 13h mov ax,0 ; fake 0 drives on error jc fl_nrd1 mov al,dl fl_nrd1: pop di ret