2 * DOS interrupt 25h handler
4 * Copyright 1997 Andreas Mohr
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 #include "wine/debug.h"
33 WINE_DEFAULT_DEBUG_CHANNEL(int);
36 /***********************************************************************
39 * Read raw sectors from a device.
41 BOOL DOSVM_RawRead(BYTE drive, DWORD begin, DWORD nr_sect, BYTE *dataptr, BOOL fake_success)
43 WCHAR root[] = {'\\','\\','.','\\','A',':',0};
46 TRACE( "abs diskread, drive %d, sector %ld, "
47 "count %ld, buffer %p\n",
48 drive, begin, nr_sect, dataptr );
51 h = CreateFileW(root, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING,
52 FILE_FLAG_BACKUP_SEMANTICS, NULL);
53 if (h != INVALID_HANDLE_VALUE)
55 SetFilePointer(h, begin * 512, NULL, SEEK_SET );
56 /* FIXME: check errors */
57 ReadFile(h, dataptr, nr_sect * 512, NULL, NULL );
62 memset( dataptr, 0, nr_sect * 512 );
65 /* FIXME: explain what happens here */
66 if (begin == 0 && nr_sect > 1) *(dataptr + 512) = 0xf8;
67 if (begin == 1) *dataptr = 0xf8;
77 /**********************************************************************
78 * DOSVM_Int25Handler (WINEDOS16.137)
80 * Handler for int 25h (absolute disk read).
82 void WINAPI DOSVM_Int25Handler( CONTEXT86 *context )
84 WCHAR drivespec[4] = {'A', ':', '\\', 0};
85 BYTE *dataptr = CTX_SEG_OFF_TO_LIN( context, context->SegDs, context->Ebx );
89 drivespec[0] += AL_reg( context );
91 if (GetDriveTypeW( drivespec ) == DRIVE_NO_ROOT_DIR ||
92 GetDriveTypeW( drivespec ) == DRIVE_UNKNOWN)
95 SET_AX( context, 0x0201 ); /* unknown unit */
99 if (CX_reg( context ) == 0xffff)
101 begin = *(DWORD *)dataptr;
102 length = *(WORD *)(dataptr + 4);
103 dataptr = (BYTE *)CTX_SEG_OFF_TO_LIN( context,
104 *(WORD *)(dataptr + 8),
105 *(DWORD *)(dataptr + 6) );
109 begin = DX_reg( context );
110 length = CX_reg( context );
113 DOSVM_RawRead( AL_reg( context ), begin, length, dataptr, TRUE );
114 RESET_CFLAG( context );