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include vmm.inc
 
mov     esi, OFFSET32 EventCallback ; points to callback procedure
mov     edx, OFFSET32 RefData       ; points to reference data
VMMcall Call_Global_Event
 
mov     [Event], esi                ; event handle or zero if not scheduled
 
The Call_Global_Event service either calls the event callback procedure
immediately, or schedules a global event. This service schedules the event
if the virtual device is processing a hardware interrupt that interrupted
the VMM. In all other cases, the service calls the callback procedure
without scheduling an event.
 
This is an asynchronous service.
 
Parameter      Description
────────────────────────────────────────────────────────────────────────────
 
EventCallback  Points to the callback procedure. See the Comments section
               for more information about the procedure.
 
RefData        Points to reference data to be passed to the event callback
               procedure.
 
Return Value
 
The ESI register is zero if the service calls the callback procedure.
Otherwise, the ESI register contains the event handle. The event handle can
be used in subsequent calls to the Cancel_Global_Event service to cancel the
event.
 
Comments
 
If the service schedules a global event, the system calls the event callback
procedure immediately before the returning from the current interrupt. Any
virtual machine can process the event, so the system does not switch tasks
before calling the procedure.
 
The callback procedure can carry out any actions, and use any VMM services.
The system calls the event callback procedure as follows:
 
mov     ebx, VM                 ; current VM handle
mov     edx, OFFSET32 RefData   ; points to reference data
mov     ebp, OFFSET32 crs       ; points to a Client_Reg_Struc
call    [EventCallback]
 
The VM parameter is a handle identifying the current virtual machine,
RefData points to reference data supplied by the virtual machine that
scheduled the event, and crs points to a Client_Reg_Struc structure
containing the contents of the virtual machine's registers.
 
The callback procedure can modify EAX, EBX, ECX, EDX, ESI, and EDI.
 
Uses
 
Flags
 
See Also
 
Cancel_Global_Event, Schedule_Global_Event
 
 
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