Int 2F/AX=1685h

MS Windows - SWITCH VMs AND CALLBACK

AX = 1685h
BX = VM ID of virtual machine to switch to
CX = flags (see #02717)
DX:SI = priority boost (refer to VMM.INC)
ES:DI -> FAR procedure to callback

Return:
CF set on error
AX = error code
01h invalid VM ID
02h invalid priority boost
03h invalid flags
CF clear if successful
event will be or has been called

Notes: Some DOS devices, such as networks, need to call functions in a specific VM. This call forces the appropriate VM to be installed.. The callback procedure must preserve all registers and return with IRET

See Also: AX=1683h - INT 15/AX=1117h - AX=DB06h"WINGO"


Bitfields for VM switching flags:

Bit(s)  Description     (Table 02717)
0      wait until interrupts enabled
1      wait until critical section unowned
2-15   reserved (zero)

Category: Windows - Int 2Fh - M

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