Set Segment Base Address

Sets the 32-bit linear base address field in the LDT descriptor for the specified segment.

Call With

AX = 0007H
BX = selector
CX:DX = 32-bit linear base address of segment

Returns

if function successful
Carry flag = clear

if function unsuccessful
Carry flag = set
AX = error code

8022H invalid selector

8025H invalid linear address (changing the base would cause the descriptor to reference a linear address range outside that allowed for DPMI clients)

Notes

A DPMI 1.0 host will automatically reload any segment register which contains the selector specified in register BX. It is suggested that DPMI 0.9 hosts also implement this.
Refer to the rules for descriptor usage in Appendix D.

8022H	invalid selector
8025H	invalid linear address (changing the base would cause the descriptor to reference a linear address range outside that allowed for DPMI clients)