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include vmm.inc VMMcall Begin_Nest_V86_Exec |
The Begin_Nest_V86_Exec service sets the current virtual machine to V86 mode and prepares the virtual machine for nested execution. This service is used in conjunction with the End_Nest_Exec service to create a nested execution block in which a virtual device may call the Exec_Int and Resume_Exec services. Virtual devices use these services to call software in the virtual machine.
This service has no parameters.
The Client_CS and Client_IP registers contain a break point used by nested execution services.
When in a nested execution block, a virtual device may call the Exec_Int and Resume_Exec services any number of times.
This service should only be used by virtual devices that convert protected-mode calls into V86 calls. For example, the virtual MS-DOS manager uses this service to map calls to MS-DOS functions (Interrupt 21h) issued by protected-mode programs into calls to MS-DOS functions in V86 mode.
This service saves the current execution mode of the virtual machine, and End_Nest_Exec restores the mode.
Client_CS, Client_IP, Flags