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WindowsXP/admin/wmi/wbem/providers/smbios/smbdpmi/smbdpmi.c
Tanishq Dubey cb60ae51e5
Initial Commit
2025-04-27 07:49:33 -04:00

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// Copyright (c) 1995-2001 Microsoft Corporation. All rights reserved.
#pragma warning (disable:4001) // I want to use single line comments
//==============================================================================
// smbdpmi.c
#pragma warning (disable:4102) // I want to use unreferenced labels for readablity in _asm sections
#include <dos.h>
// some standard typedefs and defines
#ifndef BOOL
typedef unsigned int BOOL;
#endif
#ifndef BYTE
typedef unsigned char BYTE;
#endif
#ifndef USHORT
typedef unsigned short USHORT;
#endif
#ifndef ULONG
typedef unsigned long ULONG;
#endif
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
#define VMAJOR 0
#define VMINOR 80
#define DATFILE "SMBIOS.DAT"
#define VERFILE "SMBIOS.EPS"
// structure to hold memory allocation info
typedef struct tagMEMSTRUCT
{
ULONG Size;
ULONG BaseAddress;
ULONG Handle;
USHORT Segment;
} MEMSTRUCT;
// The EPS structures are defined here
#pragma pack(1)
// Entry point structure for DPMI services
typedef struct tagDPMI_EPS
{
USHORT PMEntry_Segment;
USHORT PMEntry_Offset;
BYTE Proc_Type;
BYTE vmajor;
BYTE vminor;
USHORT Paragraphs;
} DPMI_EPS;
// Entry point structure for SMBIOS
typedef struct tagSMB_EPS
{
char anchor[4];
BYTE checksum;
BYTE length;
BYTE version_major;
BYTE version_minor;
USHORT max_struct_size;
BYTE revision;
BYTE formatted[5];
char ianchor[5];
BYTE ieps_checksum;
USHORT table_length;
ULONG table_addr;
USHORT struct_count;
BYTE bcd_revision;
} SMB_EPS;
// Entry point structure for DMIBIOS
typedef struct tagDMI_EPS
{
char anchor[5];
BYTE checksum;
USHORT table_length;
ULONG table_addr;
USHORT struct_count;
BYTE bcd_revision;
} DMI_EPS;
// combined SMBIOS / DMIBIOS entry point structure
typedef union tagANY_EPS
{
DMI_EPS dmi;
SMB_EPS sm;
} ANY_EPS;
// PnP BIOS entry point structure
typedef struct tagPNP_EPS
{
char Signature[4];
BYTE Version;
BYTE Length;
USHORT Control_field;
BYTE Checksum;
ULONG Event_notify_flag_addr;
USHORT RM_16bit_entry_off;
USHORT RM_16bit_entry_seg;
USHORT PM_16bit_entry_off;
ULONG PM_16bit_entry_seg;
ULONG OEM_Device_Id;
USHORT RM_16bit_data_seg;
ULONG PM_16bit_data_seg;
} PNP_EPS;
// SMBIOS structure header
typedef struct _tagSHF
{
BYTE Type;
BYTE Length;
USHORT Handle;
} SHF;
#pragma pack()
typedef void (far *VOIDFUNC)( void );
// yanked these from the DMI BIOS spec
// typedef for calling PnP function 50h
typedef short (far *PNPFUNC50)(
short Function, /* PnP BIOS Function 50h */
unsigned char far *dmiBIOSRevision, /* Revision of the SMBIOS Extensions */
unsigned short far *NumStructures, /* Max. Number of Structures the BIOS will return */
unsigned short far *StructureSize, /* Size of largest SMBIOS Structure */
unsigned long far *dmiStorageBase, /* 32-bit physical base address for memory-mapped */
/* SMBIOS data */
unsigned short far *dmiStorageSize, /* Size of the memory-mapped SMBIOS data */
unsigned short BiosSelector ); /* PnP BIOS readable/writable selector */
// typedef for calling PnP function 50h
typedef short (far *PNPFUNC51)(
short Function, /* PnP BIOS Function 51h */
unsigned short far *Structure, /* Structure number/handle to retrieve*/
unsigned char far *dmiStrucBuffer, /* Pointer to buffer to copy structure data to */
unsigned short dmiSelector, /* SMBIOS data read/write selector */
unsigned short BiosSelector ); /* PnP BIOS readable/writable selector */
// SMBIOS functions
#define GET_DMI_INFORMATION 0x50
#define GET_DMI_STRUCTURE 0x51
#define SET_DMI_STRUCTURE 0x52
#define GET_DMI_STRUCTURE_CHANGE_INFO 0x53
#define DMI_CONTROL 0x54
#define GET_GPNV_INFORMATION 0x55
#define READ_GPNV_DATA 0x56
#define WRITE_GPNV_DATA 0x57
// SMBIOS function return codes
#define DMI_SUCCESS 0x00
#define DMI_UNKNOWN_FUNCTION 0x81
#define DMI_FUNCTION_NOT_SUPPORTED 0x82
#define DMI_INVALID_HANDLE 0x83
#define DMI_BAD_PARAMETER 0x84
#define DMI_INVALID_SUBFUNCTION 0x85
#define DMI_NO_CHANGE 0x86
#define DMI_ADD_STRUCTURE_FAILED 0x87
#define DMI_READ_ONLY 0x8D
#define DMI_LOCK_NOT_SUPPORTED 0x90
#define DMI_CURRENTLY_LOCKED 0x91
#define DMI_INVALID_LOCK 0x92
// anchor types
#define ANCHOR_NONE 0
#define ANCHOR_SELECT 1
#define ANCHOR_DMI 2
#define ANCHOR_SM 4
#define ANCHOR_PNP 8
// prototypes for support functions
void far *GetSMB_EPS( unsigned int anchor );
void far *GetPnP_EPS( void );
BOOL StartPM( void );
void End_PM( BYTE error );
USHORT MakeSelector( ULONG lin_addr, USHORT limit );
BOOL FreeSelector( USHORT selector );
void RawDump( BYTE far *data, USHORT length );
USHORT GetDataPathname( char *pathname, char far *envdata );
USHORT WriteFileData( char far *filepath, BYTE far *datablock, USHORT datasize );
BOOL PM_DataAlloc( MEMSTRUCT *ms );
BOOL PM_DataFree( MEMSTRUCT *ms );
BOOL DOS_DataAlloc( MEMSTRUCT *ms );
BOOL GetByTableMethod( ANY_EPS far *dmi );
BOOL GetByStructMethod( PNP_EPS far *pnp );
USHORT GetStructureLength( SHF far *pshf );
USHORT RunChecksum( BYTE far *bptr, USHORT length );
void far *CVSEG( void far *realptr );
BOOL MakeFilePath( char far *FilePath, char far *DirPath, char far *FileName );
void OutMsgRaw( char far *msg );
void OutMsgSX( char far *msg, USHORT val );
void OutMsgLX( char far *msg, ULONG lval );
void OutMsgFP( char far *msg, void far *vptr );
void OutMsgSD( char far *msg, USHORT dval );
void OutMsgBX( char far *msg, BYTE bval );
void OutMsgSS( char far *msg, char far *strg );
void OutMsgVD( char far *msg, USHORT ver1, USHORT ver2 );
USHORT OpenFile( char far *filepath );
USHORT WriteFile( USHORT handle, BYTE far *datablock, USHORT datasize );
void CloseFile( USHORT handle );
BOOL verbose = FALSE;
char DirPath[265] = "";
char FilePath[265] = "";
char helptext0[] = "Command options:\r\n\t/a\tLook for a specific EPS - use SM, DMI, or PnP (i.e. /a SM)\r\n";
char helptext1[] = "\t\t/v\tVerbose - Gives noise about what's happening\r\n";
char helptext2[] = "\t/d\tRaw Dump - Display SM BIOS data only, no file write\r\n";
// skip the pitfalls of dynamic allocation and use an static buffer
BYTE dbuff[4096];
USHORT near mainp( char far *args, char far *envdata )
{
ANY_EPS far *dmi;
PNP_EPS far *pnp;
BOOL dodump, PMode, result, help;
USHORT anchor;
verbose = FALSE;
PMode = FALSE;
dodump = FALSE;
help = FALSE;
result = FALSE;
anchor = ANCHOR_DMI | ANCHOR_SM | ANCHOR_PNP;
GetDataPathname( DirPath, envdata );
// check for command line options
while ( *args++ != 0x0d )
{
if ( args[0] == '-' || args[0] == '/' )
{
switch ( args[1] )
{
case 'v':
case 'V':
verbose = TRUE;
break;
case 'd':
case 'D':
dodump = TRUE;
break;
case 'a':
case 'A':
anchor = ANCHOR_SELECT;
break;
case '?':
case 'h':
case 'H':
help = TRUE;
break;
default:
break;
}
}
else if ( anchor == ANCHOR_SELECT )
{
if ( args[0] == 'D' && args[1] == 'M' && args[2] == 'I' )
{
anchor = ANCHOR_DMI;
}
else if ( args[0] == 'S' && args[1] == 'M' )
{
anchor = ANCHOR_SM;
}
else if ( args[0] == 'P' && args[1] == 'n' && args[2] == 'P' )
{
anchor = ANCHOR_PNP;
}
else
{
anchor = ANCHOR_DMI | ANCHOR_SM | ANCHOR_PNP;
}
}
while ( *args != 0x20 && *args != 0x0d )
{
args++;
}
}
if ( help || verbose )
{
OutMsgVD( "Microsoft (R) SMBIOS Data Locator Version ", VMAJOR, VMINOR );
OutMsgRaw( "Copyright (c) 1995-2001 Microsoft Corporation. All rights reserved.\r\n\n" );
if ( help )
{
OutMsgRaw( helptext0 );
OutMsgRaw( helptext1 );
OutMsgRaw( helptext2 );
return 0;
}
}
dmi = (void far *) 0;
pnp = (void far *) 0;
if ( anchor == ANCHOR_SELECT )
{
anchor = ANCHOR_DMI | ANCHOR_SM | ANCHOR_PNP;
}
if ( anchor & ( ANCHOR_SM | ANCHOR_DMI ) )
{
dmi = GetSMB_EPS( anchor );
if ( dmi )
{
anchor &= ~ANCHOR_PNP;
}
}
if ( anchor & ANCHOR_PNP )
{
pnp = GetPnP_EPS( );
}
if ( dmi || pnp )
{
if ( dmi )
{
if ( StartPM( ) == 0 )
{
PMode = TRUE;
// change the segment of the dmi structure into a standard selector
_asm
{
mov ax, 0002h
mov bx, word ptr dmi + 2
int 31h
mov word ptr dmi + 2, ax
}
result = GetByTableMethod( dmi );
}
else
{
result = 0;
}
}
else if ( pnp )
{
result = GetByStructMethod( pnp );
}
}
else if ( verbose )
{
OutMsgRaw( "\n SMBIOS NOT Found!!!\r\n" );
}
if ( result )
{
if ( dodump )
{
if ( verbose )
{
OutMsgRaw( "_________________________________________\r\n\n" );
OutMsgRaw( "Dumping SMBIOS Data...\r\n" );
OutMsgRaw( "_________________________________________\r\n\n" );
}
//RawDump( table_data, (USHORT) ms.Size );
}
else
{
USHORT eps_length;
if ( dmi )
{
eps_length = *( (char far *) dmi + 1 ) == 'D' ? (USHORT) sizeof( DMI_EPS ) : dmi->sm.length;
MakeFilePath( FilePath, DirPath, VERFILE );
if ( verbose )
{
OutMsgSS( " Writing EPS data file at:\r\n ", FilePath );
OutMsgRaw( "\n" );
}
WriteFileData( (char far *) FilePath, (void far *) dmi, (USHORT) eps_length );
}
}
}
else if ( !dodump ) // write a dummy file if there's a failure
{
ULONG scratch = 0;
MakeFilePath( FilePath, DirPath, DATFILE );
if ( verbose )
{
OutMsgSS( " Writing stub data file at:\r\n ", FilePath );
}
WriteFileData( (char far *) FilePath, (BYTE far *) &scratch, sizeof( ULONG ) );
}
return 0;
}
// Find the SMBIOS Entry Point Structure
void far *GetSMB_EPS( unsigned int anchor )
{
ANY_EPS far *eps;
ULONG offset;
BOOL found, dmi;
USHORT i;
// According to Fabrizio, some EPS's are also located in segment E000 so we have
// to check another 64k
USHORT SegArray[] = { 0xe000, 0xf000 };
found = FALSE;
if ( verbose )
{
OutMsgRaw( "_________________________________________\r\n\n" );
OutMsgRaw( "Looking for SMBIOS EPS...\r\n" );
OutMsgRaw( "_________________________________________\r\n\n" );
}
for ( i = 0; !found && ( i < sizeof( SegArray ) / sizeof( USHORT ) ); i++ )
{
if ( verbose )
{
OutMsgSX( " Scanning Segment:\t\t", SegArray[i] );
//OutMsgRaw( "\r\n" );
}
offset = 0;
while ( offset < 0x10000 )
{
eps = (ANY_EPS far *) _MK_FP( SegArray[i], (USHORT) offset );
if ( anchor & ANCHOR_SM &&
eps->sm.anchor[0] == '_' && eps->sm.anchor[1] == 'S' &&
eps->sm.anchor[2] == 'M' && eps->sm.anchor[3] == '_' &&
eps->sm.length >= sizeof( SMB_EPS ) &&
eps->sm.ianchor[0] == '_' && eps->sm.ianchor[1] == 'D' &&
eps->sm.ianchor[2] == 'M' && eps->sm.ianchor[3] == 'I' &&
eps->sm.ianchor[4] == '_' )
{
if ( RunChecksum( (BYTE far *) eps, eps->sm.length ) == 0 )
{
found = TRUE;
dmi = FALSE;
break;
}
}
else if ( anchor & ANCHOR_DMI &&
eps->dmi.anchor[0] == '_' && eps->dmi.anchor[1] == 'D' &&
eps->dmi.anchor[2] == 'M' && eps->dmi.anchor[3] == 'I' &&
eps->dmi.anchor[4] == '_' )
{
if ( RunChecksum( (BYTE far *) eps, sizeof( DMI_EPS ) ) == 0 )
{
found = TRUE;
dmi = TRUE;
break;
}
}
offset += 0x10;
}
}
if ( found && verbose )
{
OutMsgRaw( "_________________________________________\r\n\n" );
OutMsgRaw( "SMBIOS Found...\r\n" );
OutMsgRaw( "_________________________________________\r\n\n" );
OutMsgSS( " Anchor:\t\t\t", dmi ? "\"_DMI_\"" : "\"_SM_\"" );
OutMsgFP( " EPS Found at:\t\t\t", eps );
OutMsgBX( " EPS checksum:\t\t\t", (BYTE) ( dmi ? eps->dmi.checksum : eps->sm.checksum ) );
OutMsgVD( " Version:\t\t\t", dmi ? (USHORT) ( eps->dmi.bcd_revision >> 4 ) : (USHORT) ( eps->sm.bcd_revision >> 4 ),
dmi ? (USHORT) ( eps->dmi.bcd_revision & 0x0f ) :(USHORT) ( eps->sm.bcd_revision & 0x0f ) );
OutMsgSD( " Structure Count:\t\t", (USHORT) ( dmi ? eps->dmi.struct_count : eps->sm.struct_count ) );
OutMsgLX( " Table 32-bit Address:\t\t", dmi ? eps->dmi.table_addr : eps->sm.table_addr );
OutMsgSD( " Table Length:\t\t\t", dmi ? eps->dmi.table_length : eps->sm.table_length );
}
return found ? (void far *) eps : (void far *) 0;
}
// Find the PnP Entry Point Structure
void far *GetPnP_EPS( void )
{
PNP_EPS far *pnp;
ULONG offset;
BOOL found;
offset = 0;
found = FALSE;
if ( verbose )
{
OutMsgRaw( "_________________________________________\r\n\n" );
OutMsgRaw( "Looking for PnP BIOS EPS...\r\n" );
OutMsgRaw( "_________________________________________\r\n\n" );
OutMsgRaw( " Scanning Segment:\t\tf000\r\n" );
}
while ( offset < 0x10000 )
{
pnp = (PNP_EPS far *) _MK_FP( 0xf000, (USHORT) offset );
if ( pnp->Signature[0] == '$' && pnp->Signature[1] == 'P' &&
pnp->Signature[2] == 'n' && pnp->Signature[3] == 'P' &&
pnp->Length >= sizeof( PNP_EPS ) )
{
if ( RunChecksum( (BYTE far *) pnp, pnp->Length ) == 0 )
{
found = TRUE;
break;
}
}
offset += 0x10; // increment to next paragraph
}
if ( found && verbose )
{
OutMsgRaw( "_________________________________________\r\n\n" );
OutMsgRaw( "PnP BIOS Found...\r\n" );
OutMsgRaw( "_________________________________________\r\n\n" );
OutMsgRaw( " Anchor:\t\t\t\"$PnP\"\r\n" );
OutMsgFP( " EPS Found at:\t\t\t", pnp );
OutMsgBX( " EPS checksum:\t\t\t", pnp->Checksum );
OutMsgVD( " Version:\t\t\t", (USHORT) ( pnp->Version >> 4 ), (USHORT) ( pnp->Version & 0x0f ) );
OutMsgFP( " Real Mode Entry Point:\t", _MK_FP( pnp->RM_16bit_entry_seg, pnp->RM_16bit_entry_off ) );
OutMsgSX( " Real Mode Data Segment:\t", pnp->RM_16bit_data_seg );
OutMsgLX( " 32-bit Entry Point Address:\t", pnp->PM_16bit_entry_seg + pnp->PM_16bit_entry_off );
OutMsgLX( " 32-bit Base Data Address:\t", pnp->PM_16bit_data_seg );
OutMsgLX( " OEM Device Id:\t\t", pnp->OEM_Device_Id );
}
return found ? pnp : (void far *) 0;
}
BOOL GetByTableMethod( ANY_EPS far *dmi )
{
BOOL result;
USHORT hfile;
result = FALSE;
if ( dmi )
{
// convert the SMBIOS eps to a DMI BIOS eps by adding 16 bytes
if ( *( (char far *) dmi + 1 ) == 'S' )
{
dmi = (ANY_EPS far *) ( (BYTE far * ) dmi + 16 );
}
MakeFilePath( FilePath, DirPath, DATFILE );
hfile = OpenFile( FilePath );
if ( hfile != 0xffff )
{
BYTE far *table_src;
BYTE far *table_dest;
USHORT smb_selector, i, j;
// get a far pointer for the table source memory
smb_selector = MakeSelector( dmi->dmi.table_addr, dmi->dmi.table_length );
if ( smb_selector )
{
table_src = (BYTE far *) _MK_FP( smb_selector, 0 );
// get a far pointer for the table destination
//table_dest = (BYTE far *) _MK_FP( ms->Segment, 0 );
table_dest = (BYTE far *) dbuff;
if ( verbose )
{
OutMsgRaw( "_________________________________________\r\n\n" );
OutMsgRaw( "Copying SMBIOS Table Data from ROM...\r\n" );
OutMsgRaw( "_________________________________________\r\n\n" );
OutMsgFP( " Protected Mode Table Address:\t", _MK_FP( smb_selector, 0 ) );
}
for ( i = 0, j = 0; j < dmi->dmi.table_length; i++, j++ )
{
if ( i >= 4096 )
{
WriteFile( hfile, table_dest, i );
i = 0;
}
table_dest[i] = table_src[j];
}
if ( i > 0 )
{
WriteFile( hfile, table_dest, i );
}
CloseFile( hfile );
if ( verbose )
{
OutMsgSD( " Bytes Copied:\t\t\t", j );
OutMsgSS( " Writing SMBIOS data file at:\r\n ", FilePath );
}
// free the selector for the source table
FreeSelector( smb_selector );
result = TRUE;
}
}
}
return result;
}
BOOL GetByStructMethod( PNP_EPS far *pnp )
{
BYTE bios_rev;
USHORT struct_count;
USHORT struct_size;
ULONG store_base;
USHORT store_size;
short result;
PNPFUNC50 GetSMBInfo;
PNPFUNC51 GetSMBStruct;
result = -1;
if ( pnp && pnp->RM_16bit_entry_seg )
{
// sorry, but I have to convert "data" pointers to function pointers
# pragma warning (disable : 4055)
GetSMBInfo = (PNPFUNC50) _MK_FP( pnp->RM_16bit_entry_seg, pnp->RM_16bit_entry_off );
GetSMBStruct = (PNPFUNC51) _MK_FP( pnp->RM_16bit_entry_seg, pnp->RM_16bit_entry_off );
# pragma warning (default : 4055)
if ( verbose )
{
OutMsgRaw( "_________________________________________\r\n\n" );
OutMsgRaw( "DMI BIOS Information...\r\n" );
OutMsgRaw( "_________________________________________\r\n\n" );
OutMsgBX( " PnP BIOS Functon:\t\t", GET_DMI_INFORMATION );
}
result = GetSMBInfo( GET_DMI_INFORMATION,
(BYTE far *) &bios_rev,
(USHORT far *) &struct_count,
(USHORT far *) &struct_size,
(ULONG far *) &store_base,
(USHORT far *) &store_size,
pnp->RM_16bit_data_seg );
}
if ( result == DMI_SUCCESS )
{
BYTE far *struct_dest;
BYTE far *table_dest;
USHORT smb_segment;
USHORT handle;
USHORT struct_length;
USHORT byte_count;
USHORT hfile;
USHORT meter;
if ( verbose )
{
OutMsgVD( " BIOS Revision:\t\t", (USHORT) bios_rev >> 4, (USHORT) bios_rev & 0x0f );
OutMsgSD( " Structure count:\t\t", struct_count );
OutMsgSD( " Structure size:\t\t", struct_size );
OutMsgLX( " Storage base:\t\t\t", store_base );
OutMsgSD( " Storage size:\t\t\t", store_size );
}
handle = 0;
byte_count = 0;
MakeFilePath( FilePath, DirPath, DATFILE );
hfile = OpenFile( FilePath );
if ( hfile != 0xffff )
{
if ( verbose )
{
OutMsgRaw( "_________________________________________\r\n\n" );
OutMsgRaw( "Copying DMI BIOS Data...\r\n" );
OutMsgRaw( "_________________________________________\r\n\n" );
OutMsgBX( " Iterate PnP BIOS Functon:\t", GET_DMI_STRUCTURE );
}
//struct_dest = (BYTE far *) _MK_FP( ms->Segment, 0 );
table_dest = (BYTE far *) dbuff;
struct_dest = (BYTE far *) dbuff;
//smb_sel = MakeSelector( store_base, store_size );
// were not in protected mode so this wont be used...but we'll make a seg value anyway
smb_segment = (USHORT) ( store_base >> 4 );
meter = 0;
struct_count = 0;
while ( handle != 0xffff && byte_count < 65536 )
{
result = GetSMBStruct( GET_DMI_STRUCTURE,
(USHORT far *) &handle,
(BYTE far *) struct_dest,
smb_segment,
pnp->RM_16bit_data_seg );
if ( result == DMI_SUCCESS )
{
struct_length = GetStructureLength( (SHF far *) struct_dest );
struct_dest += struct_length;
byte_count += struct_length;
meter += struct_length;
struct_count++;
if ( meter > ( 4096 - struct_size ) )
{
WriteFile( hfile, table_dest, meter );
struct_dest = table_dest;
meter = 0;
}
}
}
if ( meter > 0 )
{
WriteFile( hfile, table_dest, meter );
}
CloseFile( hfile );
if ( verbose )
{
OutMsgSD( " Structures copied:\t\t", struct_count );
OutMsgSD( " Total bytes retrieved:\t", byte_count );
OutMsgSS( " Writing SMBIOS data file at:\r\n ", FilePath );
}
result = DMI_SUCCESS;
}
}
if ( verbose )
{
switch ( result )
{
case DMI_SUCCESS:
break;
case DMI_UNKNOWN_FUNCTION:
case DMI_FUNCTION_NOT_SUPPORTED:
{
OutMsgBX( " DMI structures not available:\trc = ", (BYTE) result );
}
break;
default:
{
OutMsgRaw( " PnP call (GET_DMI_INFORMATION) failed.\r\n" );
}
break;
}
}
return result == DMI_SUCCESS;
}
// protected mode functions...
BOOL StartPM( void )
{
BOOL result;
unsigned int PMEntry_Segment;
unsigned int PMEntry_Offset;
unsigned char Proc_Type;
unsigned char VMajor;
unsigned char VMinor;
unsigned int Paragraphs;
unsigned int far *PMEntry;
OutMsgRaw( "_________________________________________\r\n" );
OutMsgRaw( "\nSwitching to Protected Mode...\r\n" );
OutMsgRaw( "_________________________________________\r\n\n" );
// get DPMI entry point data
_asm
{
mov ax, 1687h
int 2Fh
mov result, ax
}
if ( !result )
{
// set the dpmi EPS data
_asm
{
mov Proc_Type, cl
mov VMajor, dh
mov VMinor, dl
mov Paragraphs, si
mov PMEntry_Segment, es
mov PMEntry_Offset, di
}
result = 1;
PMEntry = _MK_FP( PMEntry_Segment, PMEntry_Offset );
_asm
{
;check if needed and allocate necessary DPMI host data area
Check_Host_Mem:
test si, si
jz Start_PM
mov bx, si
mov ah, 48h
int 21h
jc PMEntry_Fail
mov es, ax ;data area segment
Start_PM:
xor ax, ax ;clear to indicate 16-bit app
call dword ptr PMEntry ;do the switch!
jc PMEntry_Fail
mov result, 0
PMEntry_Fail:
}
}
if ( verbose)
{
if ( !result )
{
OutMsgFP( " DPMI Entry Point:\t\t", _MK_FP( PMEntry_Segment, PMEntry_Offset ) );
OutMsgSD( " Processor Type:\t\t80", (USHORT) Proc_Type * 100 + 86 );
OutMsgVD( " DPMI Version:\t\t\t", VMajor, VMinor );
OutMsgSD( " Paragraphs needed:\t\t", (USHORT) Paragraphs );
}
else
{
OutMsgRaw( " Protected Mode Switch Failed!!!\r\n" );
}
}
return result;
}
// switch back to Real Mode and terminate with error code
void End_PM( BYTE error )
{
_asm
{
mov al, error
mov ah, 4Ch
int 21h
}
}
USHORT MakeSelector( ULONG lin_addr, USHORT limit )
{
USHORT new_sel;
BOOL result;
new_sel = 0;
// Allocate a descriptor then set the address and limit
_asm
{
mov ax, 0000h ;Allocate LDT descriptor function
mov cx, 0001h ;just one, smbios data outta be < 64k
int 31h
jc were_hosed
mov new_sel, ax
;Set selector base address
mov ax, 0007h ;Set Segment base address function
mov bx, new_sel ;use our new selector value
mov cx, word ptr lin_addr + 2 ;get the high word of the linear address
mov dx, word ptr lin_addr ;get the low word of the linear address
int 31h
jc were_hosed
;Set selector limit
mov ax, 0008h ;Set Segment limit function
mov bx, new_sel ;use our new selector value
xor cx, cx ;our limit can't be > 64k, null the high word
mov dx, limit ;use table length as limit
int 31h
jc were_hosed
mov result, 0
jmp alloc_done
were_hosed:
mov result, 1
alloc_done:
}
if ( result && new_sel )
{
FreeSelector( new_sel );
new_sel = 0;
}
return new_sel;
}
BOOL FreeSelector( USHORT selector )
{
BOOL result = FALSE;
if ( selector )
{
_asm
{
Free_Selector:
mov ax, 0001h ;Free LDT Descriptor function
mov bx, selector ;use our allocated selector
int 31h
jnc Free_Fail
mov result, 1
Free_Fail:
}
}
return result;
}
//==============================================================================
// Data allocation functions
#if 0
BOOL DOS_DataAlloc( MEMSTRUCT *ms )
{
BOOL result;
USHORT temp_seg, pghs;
pghs = (USHORT) ( ms->Size >> 4 );
pghs += (USHORT) ( ( ms->Size % 16 ) ? 1 : 0 );
_asm
{
dda_start:
mov bx, pghs
mov ah, 48h
int 21h
jc dda_fail
mov temp_seg, ax ;data area segment
mov result, 1
jmp dda_done
dda_fail:
mov result, 0
dda_done:
}
if ( result )
{
ms->Segment = temp_seg;
ms->BaseAddress = (ULONG) ms->Segment << 4;
}
else
{
ms->Segment = 0;
ms->BaseAddress = 0;
}
ms->Handle = 0;
return result;
}
BOOL PM_DataAlloc( MEMSTRUCT *ms )
{
BOOL result;
unsigned long bsize, temp_addr, temp_handle;
bsize = ms->Size;
_asm
{
la_start:
mov ax, 0501h
mov bx, word ptr bsize + 2
mov cx, word ptr bsize
int 31h
jc la_error
mov word ptr temp_addr + 2, bx
mov word ptr temp_addr, cx
mov word ptr temp_handle + 2, si
mov word ptr temp_handle, di
mov result, 1
jmp la_done
la_error:
mov result, 0
la_done:
}
if ( result )
{
ms->BaseAddress = temp_addr;
ms->Handle = temp_handle;
ms->Segment = MakeSelector( ms->BaseAddress, (USHORT) ms->Size );
// if we can't make the selector then free the memory
if ( !ms->Segment )
{
PM_DataFree( ms );
result = FALSE;
}
}
if ( !result )
{
ms->BaseAddress = 0;
ms->Handle = 0;
ms->Segment = 0;
}
return result;
}
BOOL PM_DataFree( MEMSTRUCT *ms )
{
if ( ms->Handle )
{
ULONG handle;
handle = ms->Handle;
_asm
{
mov ax, 0502h
mov si, word ptr handle + 2
mov di, word ptr handle
int 31h
}
return TRUE;
}
else
{
return FALSE;
}
}
#endif
void far *CVSEG( void far *realptr )
{
_asm
{
mov ax, 0002h
mov bx, word ptr realptr + 2
int 31h
mov word ptr realptr + 2, ax
}
return realptr;
}
// Hex dump of a data block to stdio
void RawDump( BYTE far *data, USHORT length )
{
USHORT i;
BYTE far *dval;
dval = (BYTE far *) data;
for ( i = 0; i < length; i++, dval++ )
{
if ( !( i % 16 ) )
{
OutMsgRaw( "\r\n" );
}
OutMsgBX( " ", *dval );
}
OutMsgRaw( "\r\n" );
}
// hokey function to get system dir strings from envp
USHORT GetDataPathname( char *pathname, char far *envdata )
{
USHORT limit, h, i, j = 0;
BOOL skip;
char matcher, matchee;
char *datfilepath;
char far *penv;
BYTE dosv_major, dosv_minor;
// get "true" DOS version
_asm
{
mov ax, 3306h
int 21h
mov dosv_major, bl
mov dosv_minor, bh
}
switch ( dosv_major << 8 | dosv_minor )
{
case 0x0700: // Win95
case 0x070a: // Win95 SP1, Win95 OSR2, Win98
case 0x0800: // Millennium
case 0x0532: // Win NT
{
datfilepath = "\\SYSTEM";
}
break;
//case 0x0532: // Win NT
//{
// datfilepath = "\\SYSTEM32\\DRIVERS\\SMBIOS.DAT";
//}
//break;
default: // some other DOS
{
datfilepath = "";
}
break;
}
penv = envdata;
while ( *penv )
{
for ( h = 0; h < 2; h++ )
{
limit = (USHORT) ( ( h == 0 ) ? 7 : 11 );
skip = FALSE;
for ( i = 0; !skip && i < limit; i++ )
{
if ( h == 0 ) // look for Win9X windir first
{
switch ( i )
{
case 0: matcher = 'W'; break;
case 1: matcher = 'I'; break;
case 2: matcher = 'N'; break;
case 3: matcher = 'D'; break;
case 4: matcher = 'I'; break;
case 5: matcher = 'R'; break;
case 6: matcher = '='; break;
}
}
else
{
switch ( i ) // look for windir in NTVDM
{
case 0: matcher = 'S'; break;
case 1: matcher = 'Y'; break;
case 2: matcher = 'S'; break;
case 3: matcher = 'T'; break;
case 4: matcher = 'E'; break;
case 5: matcher = 'M'; break;
case 6: matcher = 'R'; break;
case 7: matcher = 'O'; break;
case 8: matcher = 'O'; break;
case 9: matcher = 'T'; break;
case 10: matcher = '='; break;
}
}
matchee = penv[i];
if ( matchee >= 'a' && matchee <= 'z' )
{
matchee -= ( 'a' - 'A' );
}
if ( matchee != matcher )
{
skip = TRUE;
}
}
if ( !skip && i == limit )
{
break;
}
}
if ( !skip && i == limit )
{
break;
}
else
{
while ( *penv++ );
}
}
if ( penv )
{
while ( penv[i + j] )
{
*pathname++ = penv[i + j++];
}
for ( i = 0; datfilepath[i] != '\0'; i++, j++ )
{
*pathname++ = datfilepath[i];
}
*pathname = '\0';
}
return j;
}
//==============================================================================
// File I/O routines
USHORT WriteFileData( char far *filepath, BYTE far *datablock, USHORT datasize )
{
USHORT bytes;
_asm
{
Create_File:
push ds ;save current ds
mov dx, word ptr filepath + 2 ;set segment of filepath
mov ds, dx
mov dx, word ptr filepath ;set offset of filepath
xor cx, cx
mov ah, 3ch
int 21h
jc File_Failure
mov bx, ax ;copy file handle
Write_File:
mov dx, word ptr datablock + 2 ;set segment of datablock
mov ds, dx
mov dx, word ptr datablock ;set offset of datablock
mov cx, word ptr datasize ;set the file data block length
mov ah, 40h
int 21h
pop ds ;restore old ds
Close_File:
mov ah, 3eh
int 21h
File_Failure:
}
return bytes;
}
USHORT OpenFile( char far *filepath )
{
USHORT handle;
// need a far fwrite, so we'll do it the hard way
_asm
{
Create_File:
push ds ;save current ds
mov dx, word ptr filepath + 2 ;set segment of filepath
mov ds, dx
mov dx, word ptr filepath ;set offset of filepath
xor cx, cx
mov ah, 3ch
int 21h
jnc Create_Done
mov ax, 0ffffh ;set invalid file handle
Create_Done:
mov handle, ax ;copy file handle
pop ds ;restore old ds
}
return handle;
}
USHORT WriteFile( USHORT handle, BYTE far *datablock, USHORT datasize )
{
USHORT bytes;
_asm
{
Write_Block:
mov bx, handle
push ds ;save current ds
mov dx, word ptr datablock + 2 ;set segment of datablock
mov ds, dx
mov dx, word ptr datablock ;set offset of datablock
mov cx, word ptr datasize ;set the file data block length
mov ah, 40h
int 21h
mov bytes, ax
pop ds ;restore old ds
}
return bytes;
}
void CloseFile( USHORT handle )
{
_asm
{
Close_File:
mov bx, handle
mov ah, 3eh
int 21h
}
}
USHORT GetStructureLength( SHF far *pshf )
{
BYTE far *pend;
USHORT len;
len = 0;
// move past formatted area
pend = (BYTE far *) pshf + pshf->Length;
// look for the double NULL
while ( pend[0] || pend[1] )
{
pend++;
len++;
}
return pshf->Length + len + 2;
}
USHORT RunChecksum( BYTE far *bptr, USHORT length )
{
// run the checksum on the EPS to validate it
USHORT bytesum = 0;
while ( length-- )
{
bytesum += (USHORT) *bptr++;
}
return bytesum & 0x00ff;
}
BOOL MakeFilePath( char far *FilePath, char far *DirPath, char far *FileName )
{
BOOL result = FALSE;
while ( *DirPath )
{
*FilePath++ = *DirPath++;
}
*FilePath++ = '\\';
while ( *FileName )
{
*FilePath++ = *FileName++;
}
return result;
}
//==============================================================================
// STDOUT functions here
void OutMsgRaw( char far *msg )
{
USHORT count;
for ( count = 0; msg[count] && count < 80; count++ );
_asm
{
push ds
mov dx, word ptr msg + 2
mov ds, dx
mov dx, word ptr msg
mov cx, count
mov bx, 1
mov ah, 40h
int 21h
pop ds ;restore old ds
}
}
USHORT HexToAsc( BYTE byteval )
{
USHORT asc;
asc = (USHORT) ( byteval & 0xf0 ) << 4;
asc |= (USHORT) ( byteval & 0x0f );
asc += (USHORT) ( ( ( asc & 0xff00 ) < 0x0a00 ) ? 0x3000 : 0x5700 );
asc += (USHORT) ( ( ( asc & 0x00ff ) < 0x000a ) ? 0x0030 : 0x0057 );
return asc;
}
void OutMsgSD( char far *msg, USHORT dval )
{
char dstrg[9];
USHORT count, i;
count = 0;
do
{
for ( i = count; i > 0; i-- )
{
dstrg[i] = dstrg[i-1];
}
dstrg[0] = (char) ( ( dval % 10 ) + '0' );
dval /= 10;
count++;
}
while ( dval );
dstrg[count++] = '\r';
dstrg[count++] = '\n';
dstrg[count] = '\0';
OutMsgRaw( msg );
OutMsgRaw( dstrg );
}
void OutMsgVD( char far *msg, USHORT ver1, USHORT ver2 )
{
char dstrg[9];
USHORT count, i;
OutMsgRaw( msg );
count = 0;
do
{
for ( i = count; i > 0; i-- )
{
dstrg[i] = dstrg[i-1];
}
dstrg[0] = (char) ( ( ver1 % 10 ) + '0' );
ver1 /= 10;
count++;
}
while ( ver1 );
dstrg[count++] = '.';
dstrg[count] = '\0';
OutMsgRaw( dstrg );
count = 0;
do
{
for ( i = count; i > 0; i-- )
{
dstrg[i] = dstrg[i-1];
}
dstrg[0] = (char) ( ( ver2 % 10 ) + '0' );
ver2 /= 10;
count++;
}
while ( ver2 );
dstrg[count++] = '\r';
dstrg[count++] = '\n';
dstrg[count] = '\0';
OutMsgRaw( dstrg );
}
void OutMsgBX( char far *msg, BYTE bval )
{
char bstrg[5];
USHORT asc;
asc = HexToAsc( bval );
bstrg[0] = (char) ( asc >> 8 );
bstrg[1] = (char) ( asc & 0x00ff );
bstrg[2] = '\r';
bstrg[3] = '\n';
bstrg[4] = '\0';
OutMsgRaw( msg );
OutMsgRaw( bstrg );
}
void OutMsgSX( char far *msg, USHORT val )
{
char sstrg[7];
USHORT asc;
asc = HexToAsc( (BYTE) ( val >> 8 ) );
sstrg[0] = (char) ( asc >> 8 );
sstrg[1] = (char) ( asc & 0x00ff );
asc = HexToAsc( (BYTE) ( val & 0x00ff ) );
sstrg[2] = (char) ( asc >> 8 );
sstrg[3] = (char) ( asc & 0x00ff );
sstrg[4] = '\r';
sstrg[5] = '\n';
sstrg[6] = '\0';
OutMsgRaw( msg );
OutMsgRaw( sstrg );
}
void OutMsgLX( char far *msg, ULONG lval )
{
USHORT asc, val;
char lstrg[11];
val = (USHORT) ( lval >> 16 );
asc = HexToAsc( (BYTE) ( val >> 8 ) );
lstrg[0] = (char) ( asc >> 8 );
lstrg[1] = (char) ( asc & 0x00ff );
asc = HexToAsc( (BYTE) ( val & 0x00ff ) );
lstrg[2] = (char) ( asc >> 8 );
lstrg[3] = (char) ( asc & 0x00ff );
val = (USHORT) ( lval & 0xffff );
asc = HexToAsc( (BYTE) ( val >> 8 ) );
lstrg[4] = (char) ( asc >> 8 );
lstrg[5] = (char) ( asc & 0x00ff );
asc = HexToAsc( (BYTE) ( val & 0x00ff ) );
lstrg[6] = (char) ( asc >> 8 );
lstrg[7] = (char) ( asc & 0x00ff );
lstrg[8] = '\r';
lstrg[9] = '\n';
lstrg[10] = '\0';
OutMsgRaw( msg );
OutMsgRaw( lstrg );
}
void OutMsgFP( char far *msg, void far *vptr )
{
char lstrg[12];
USHORT asc, seg_fp, off_fp;
seg_fp = (USHORT) _FP_SEG( vptr );
off_fp = (USHORT) _FP_OFF( vptr );
asc = HexToAsc( (BYTE) ( seg_fp >> 8 ) );
lstrg[0] = (char) ( asc >> 8 );
lstrg[1] = (char) ( asc & 0x00ff );
asc = HexToAsc( (BYTE) ( seg_fp & 0x00ff ) );
lstrg[2] = (char) ( asc >> 8 );
lstrg[3] = (char) ( asc & 0x00ff );
lstrg[4] = ':';
asc = HexToAsc( (BYTE) ( off_fp >> 8 ) );
lstrg[5] = (char) ( asc >> 8 );
lstrg[6] = (char) ( asc & 0x00ff );
asc = HexToAsc( (BYTE) ( off_fp & 0x00ff ) );
lstrg[7] = (char) ( asc >> 8 );
lstrg[8] = (char) ( asc & 0x00ff );
lstrg[9] = '\r';
lstrg[10] = '\n';
lstrg[11] = '\0';
OutMsgRaw( msg );
OutMsgRaw( lstrg );
}
void OutMsgSS( char far *msg, char far *strg )
{
OutMsgRaw( msg );
OutMsgRaw( strg );
OutMsgRaw( "\r\n" );
}
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