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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
27 #include "wine/debug.h"
29 WINE_DEFAULT_DEBUG_CHANNEL(int);
32 /***********************************************************************
35 * Read raw sectors from a device.
37 BOOL
DOSVM_RawRead(BYTE drive
, DWORD begin
, DWORD nr_sect
, BYTE
*dataptr
, BOOL fake_success
)
39 WCHAR root
[] = {'\\','\\','.','\\','A',':',0};
42 TRACE( "abs diskread, drive %d, sector %ld, "
43 "count %ld, buffer %p\n",
44 drive
, begin
, nr_sect
, dataptr
);
47 h
= CreateFileW(root
, GENERIC_READ
, FILE_SHARE_READ
, NULL
, OPEN_EXISTING
,
48 FILE_FLAG_BACKUP_SEMANTICS
, NULL
);
49 if (h
!= INVALID_HANDLE_VALUE
)
52 SetFilePointer(h
, begin
* 512, NULL
, SEEK_SET
);
53 /* FIXME: check errors */
54 ReadFile(h
, dataptr
, nr_sect
* 512, &r
, NULL
);
59 memset( dataptr
, 0, nr_sect
* 512 );
62 /* FIXME: explain what happens here */
63 if (begin
== 0 && nr_sect
> 1) *(dataptr
+ 512) = 0xf8;
64 if (begin
== 1) *dataptr
= 0xf8;
74 /**********************************************************************
77 * Handler for int 25h (absolute disk read).
79 void WINAPI
DOSVM_Int25Handler( CONTEXT
*context
)
81 WCHAR drivespec
[] = {'A', ':', '\\', 0};
82 BYTE
*dataptr
= CTX_SEG_OFF_TO_LIN( context
, context
->SegDs
, context
->Ebx
);
86 drivespec
[0] += AL_reg( context
);
88 if (GetDriveTypeW( drivespec
) == DRIVE_NO_ROOT_DIR
||
89 GetDriveTypeW( drivespec
) == DRIVE_UNKNOWN
)
92 SET_AX( context
, 0x0201 ); /* unknown unit */
96 if (CX_reg( context
) == 0xffff)
98 begin
= *(DWORD
*)dataptr
;
99 length
= *(WORD
*)(dataptr
+ 4);
100 dataptr
= (BYTE
*)CTX_SEG_OFF_TO_LIN( context
,
101 *(WORD
*)(dataptr
+ 8),
102 *(DWORD
*)(dataptr
+ 6) );
106 begin
= DX_reg( context
);
107 length
= CX_reg( context
);
110 DOSVM_RawRead( AL_reg( context
), begin
, length
, dataptr
, TRUE
);
111 RESET_CFLAG( context
);