Chapter 21. Protected-Mode Execution

Term Definition
locked protected mode stack After switching a virtual machine to protected mode, a virtual device must lock into physical memory the protected mode stack used by the virtual machine so the stack won't be removed by demand paging.
protected mode application control block Storage that is allocated when a virtual machine enters protected mode. When a virtual machine switches to protected mode, all virtual machines are notified, and one of the pieces of information included in the notification is a pointer to the protected mode application control block.

There are the following protected-mode execution services:

Allocate_PM_App_CB_Area Get_Cur_PM_App_CB
Begin_Use_Locked_PM_Stack Set_PM_Exec_Mode
End_Use_Locked_PM_Stack Set_V86_Exec_Mode
Exec_PM_Int