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include vmm.inc mov ebx, SysVM ; system VM handle mov esi, OFFSET32 CommandTail ; points to WIN386 command tail mov eax, Sys_Critical_Init |
The Sys_Critical_Init message notifies the virtual device that Windows is starting. The system sends this message to direct virtual devices to carry out, as quickly as possible, the minimum number of tasks needed to prepare the device for enabled interrupts. While virtual devices process this message, interrupts are disabled.
SysVM
Specifies a handle identifying the system virtual machine.
CommandTail
Points to the command tail retrieved from the program segment prefix (PSP) of WIN386.EXE. The first byte in the command tail specifies the length in bytes of the tail.
The carry flag is clear if the virtual device initialized successfully. Otherwise, the carry flag is set to prevent the system from loading the virtual device.
While processing this message, virtual devices typically initialize any critical functions needed to support interrupts, and claim any V86 pages required to support the device. For example, the virtual display device claims the video memory. If a virtual device provides services, it should initialize any data associated with those services.
The virtual device must not use the Simulate_Int or Exec_Int services.
Flags