Free Memory Block

Frees a memory block that was previously allocated with either the Allocate Memory Block function (Int 31H Function 0501H) or the Allocate Linear Memory Block function (Int 31H Function 0504H).

Call With

AX = 0502H
SI:DI = memory block handle

Returns

if function successful
Carry flag = clear

if function unsuccessful
Carry flag = set
AX = error code

8023H invalid handle

Notes

This call will correctly free all of the possible page types that can occur in a memory block: committed pages, uncommitted pages, and mapped pages (see Appendix A: Glossary).
No descriptors are freed by this call. It is the client's responsibility to free any descriptors that it previously allocated to map the memory block. Descriptors should be freed before linear memory blocks.