Get Segment Base Address

Call With

AX = 0006H
BX = selector

Returns

if function successful
Carry flag = clear
CX:DX = 32-bit linear base address of segment

if function unsuccessful
Carry flag = set
AX = error code

8022H

invalid selector

Notes

• Client programs must use the LSL instruction to query the limit for a descriptor. Note that on 80386 machines, the client must use the 32-bit form of LSL if the segment size is greater than 64 KB.

• Refer to the rules for descriptor usage in Appendix D.