Real-Mode Initialization Parameters

The VMM passes the following parameters to the real-mode initialization procedure.

Parameter	Description
AX	Specifies the version number of the virtual machine manager. The AH register contains the major version number, and the AL register contains the minor version number.
BX	Specifies the loading flags. This register contains one of the following values:

Duplicate_Device_ID	Device with same device identifier already loaded.
Duplicate_From_INT2F	Duplicate device identifier already loaded from Interrupt 2Fh device list.
Loading_From_INT2F	This device was specified in the Interrupt 2Fh device list.

ECX	Specifies the 32-bit address (segment:offset) of the entry point for real-mode initialization services. Virtual devices can call these services to retrieve settings from the registry and the SYSTEM.INI file.
EDX	Specifies a pointer to reference data provided in the Interrupt 2Fh. This register contains zero if there is no reference data.
SI	Specifies the segment address of the environment passed from MS-DOS.
SS:SP	Specifies the 32-bit address (segment:offset) of the stack.