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Function RTGetExtMem

This function can retrieve the amount of extended memory reported by the BIOS at boot time:

DWORD RTGetExtMem(void);

The return value is the amount of installed RAM above address 1M or zero if the BIOS does not support BIOS function int 15h, ah=E820h or ah=E801h.

Extending the heap at run-time is best done with function RTCMOSExtendHeap. Function RTCMOSExtendHeap calls RTGetExtMem internally.

Function RTUnlockHeap

Function RTExtendHeap