This DPMI 0.9 Specification is hosted by Tenberry Software, Inc.

8. Descriptor Management Services, Continued

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8.7 Set Segment Base Address

This function changes the 32-bit linear base address of the specified selector.

To Call

     AX = 0007h
     BX = Selector
     CX:DX = 32-bit linear base address for segment


     If function was successful:
     Carry flag is clear.

     If function was not successful:
     Carry flag is set.

Programmer's Notes

Code Sample:

The following function compiles with Watcom C/C++ version 11.0 or later, and Microsoft Visual C/C++ version 4.0 or later:

// Sets 32-bit linear base address in descriptor for selector

int dpmiSetSegmentBaseAddress(dpmiSelector sel,	// selector to set base address of
				unsigned long linaddr)	// new base address
	int result;			// zero if int 31h succeeds
	unsigned short errorCode;	// error code from DPMI host

	__asm {
		mov	bx, sel		// the selector to get base address of

		mov	ecx, linaddr	// put linear address into cx:dx
		mov	dx, dx
		shr	ecx, 16

		mov	eax, 0x007	// call dpmi host to do setting
		int	0x31

		mov	errorCode, ax	// save error code from DPMI, if any

		sbb	eax, eax	// record success/failure flag
		mov	result, eax

	// if the dpmi call failed, return the dpmi error code
	if (result != 0)
		return errorCode;

	// indicate success
	return 0;

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This HTML edition of the DPMI 0.9 Specification is hosted by Tenberry Software, Inc., makers of the DOS/16M and the DOS/4G family of DOS extenders. Page last modified 2003.1.28, <>