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- /*
-
- FIPS - the First nondestructive Interactive Partition Splitting program
-
-
-
- Module disk_io.cpp
-
-
-
- RCS - Header:
-
- $Header: c:/daten/fips/source/main/RCS/disk_io.cpp 1.4 1995/01/19 00:00:51 schaefer Exp schaefer $
-
-
-
- Copyright (C) 1993 Arno Schaefer
-
-
-
- This program 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 of the License, or
-
- (at your option) any later version.
-
-
-
- This program 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 this program; if not, write to the Free Software
-
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-
-
-
-
- Report problems and direct all questions to:
-
-
-
- schaefer@rbg.informatik.th-darmstadt.de
-
- */
-
-
-
- #include "disk_io.h"
-
- #include <dos.h>
-
- #include <bios.h>
-
-
-
- #define DISK_INT 0x13
-
-
-
- #define RESET_DISK 0
-
- #define READ_SECTOR 2
-
- #define WRITE_SECTOR 3
-
- #define VERIFY_SECTOR 4
-
- #define GET_DRIVE_PARAMS 8
-
- #define GET_DISK_TYPE 0x15
-
-
-
-
-
- /* ----------------------------------------------------------------------- */
-
- /* Bios call to get the number of drives attached */
-
- /* ----------------------------------------------------------------------- */
-
-
-
- int get_no_of_drives (void)
-
- {
-
- union REGS regs;
-
-
-
- regs.h.ah = GET_DRIVE_PARAMS;
-
- regs.h.dl = 0x80;
-
- int86 (DISK_INT, ®s, ®s);
-
-
-
- if (regs.h.ah != 0) return (1); // will be checked again
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- return (regs.h.dl);
-
- }
-
-
-
-
-
- /* ----------------------------------------------------------------------- */
-
- /* Calculates physical sector number (Head, Cylinder, Sector). */
-
- /* Log_sector is absolute logical sector number (0 = master boot record). */
-
- /* ----------------------------------------------------------------------- */
-
-
-
- physical_sector_no::physical_sector_no
-
- (
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- dword logical_sector,
-
- const drive_geometry &geometry
-
- )
-
- {
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- cylinder =
-
- logical_sector
-
- / (geometry.heads * geometry.sectors);
-
-
-
- head =
-
- (
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- logical_sector
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- - (cylinder * geometry.heads * geometry.sectors)
-
- )
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- / geometry.sectors;
-
-
-
- sector =
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- logical_sector
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- - (cylinder * geometry.heads * geometry.sectors)
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- - (head * geometry.sectors)
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- + 1;
-
- }
-
-
-
-
-
- /* ----------------------------------------------------------------------- */
-
- /* Bios call get_drive_geometry, returns error status in var errorcode */
-
- /* ----------------------------------------------------------------------- */
-
-
-
- void physical_drive::get_geometry (void)
-
- {
-
- union REGS regs;
-
-
-
- regs.h.ah = GET_DRIVE_PARAMS;
-
- regs.h.dl = number;
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- int86 (DISK_INT, ®s, ®s);
-
-
-
- if ((errorcode = regs.h.ah) != 0) return;
-
-
-
- geometry.heads = (dword) regs.h.dh + 1;
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- geometry.sectors = (dword) regs.h.cl & 0x3f;
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- geometry.cylinders =
-
- (
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- (dword) regs.h.ch
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- | (((dword) regs.h.cl << 2) & 0x300)
-
- ) + 1;
-
- }
-
-
-
-
-
- /* ----------------------------------------------------------------------- */
-
- /* Bios call reset_drive, returns error status in var errorcode */
-
- /* ----------------------------------------------------------------------- */
-
-
-
- void physical_drive::reset (void)
-
- {
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- union REGS regs;
-
-
-
- regs.h.ah = RESET_DISK;
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- regs.h.dl = number;
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- int86 (DISK_INT, ®s, ®s);
-
-
-
- errorcode = regs.h.ah;
-
- }
-
-
-
-
-
- /* ----------------------------------------------------------------------- */
-
- /* Initialization physical_drive, requires drive number. */
-
- /* Calls get_drive_geometry, errorcode contains return status */
-
- /* ----------------------------------------------------------------------- */
-
-
-
- physical_drive::physical_drive (int number)
-
- {
-
- physical_drive::number = number;
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- get_geometry ();
-
- };
-
-
-
-
-
- /* ----------------------------------------------------------------------- */
-
- /* Initialization physical_drive with physical_drive object */
-
- /* ----------------------------------------------------------------------- */
-
-
-
- physical_drive::physical_drive (physical_drive &pd)
-
- {
-
- number = pd.number;
-
- errorcode = pd.errorcode;
-
- geometry = pd.geometry;
-
- }
-
-
-
-
-
- /* ----------------------------------------------------------------------- */
-
- /* Assignment operator for physical drive */
-
- /* ----------------------------------------------------------------------- */
-
-
-
- void physical_drive::operator= (physical_drive &pd)
-
- {
-
- number = pd.number;
-
- errorcode = pd.errorcode;
-
- geometry = pd.geometry;
-
- }
-
-
-
-
-
- /* ----------------------------------------------------------------------- */
-
- /* Read sector */
-
- /* ----------------------------------------------------------------------- */
-
-
-
- int physical_drive::read_sector (struct sector *sector, dword sector_number)
-
- {
-
- physical_sector_no p (sector_number, geometry);
-
-
-
- boolean done = false;
-
-
-
- for (int i=0; i<3; i++)
-
- {
-
- if (biosdisk
-
- (
-
- READ_SECTOR,
-
- number,
-
- p.head,
-
- p.cylinder,
-
- p.sector,
-
- 1,
-
- sector->data
-
- ) == 0)
-
- {
-
- done=true;
-
- break;
-
- }
-
-
-
- reset ();
-
- }
-
-
-
- if (!done) return (-1);
-
- return 0;
-
- }
-
-
-
-
-
- /* ----------------------------------------------------------------------- */
-
- /* Write sector with verify */
-
- /* ----------------------------------------------------------------------- */
-
-
-
- int physical_drive::write_sector (struct sector *sector, dword sector_number)
-
- {
-
- physical_sector_no p (sector_number,geometry);
-
-
-
- boolean done = false;
-
-
-
- for (int i=0; i<3; i++)
-
- {
-
- if (biosdisk
-
- (
-
- WRITE_SECTOR,
-
- number,
-
- p.head,
-
- p.cylinder,
-
- p.sector,
-
- 1,
-
- sector->data
-
- ) == 0)
-
- {
-
- done=true;
-
- break;
-
- }
-
-
-
- reset ();
-
- }
-
-
-
- if (!done) return (-1);
-
-
-
- if (biosdisk
-
- (
-
- VERIFY_SECTOR,
-
- number,
-
- p.head,
-
- p.cylinder,
-
- p.sector,
-
- 1,
-
- sector->data
-
-
-
- ) != 0) return (-1);
-
-
-
- return 0;
-
- }
-
-
-
-
-
- /* ----------------------------------------------------------------------- */
-
- /* Bios call get_disk_type - returns 0 if drive not present. */
-
- /* Valid drive numbers: 0 - 255, result: 1 - floppy without disk change */
-
- /* detection, 2 - floppy with disk change detection, 3 - harddisk */
-
- /* ----------------------------------------------------------------------- */
-
-
-
- int get_disk_type (int drive_number)
-
- {
-
- union REGS regs;
-
-
-
- regs.h.ah = GET_DISK_TYPE;
-
- regs.h.dl = drive_number;
-
- int86 (DISK_INT, ®s, ®s);
-
-
-
- if (regs.x.cflag) return 0;
-
- return (regs.h.ah); // disk type
-
- }
-
-