en:docs:dpmi:api:int31:09:02

Note: This API calls are shared between DOS and Win16 personality.

DOSX is a specialized version of DPMI. Windows standard and extended mode kernel is a DPMI client app. Standard and extended mode kernel differs minimally and shares common codebase. Standard mode is just DPMI client, exnhanced mode is DPMI client running under Virtual Machime Manager. Both modes shares DPMI interface for kernel communication. The OS/2 virtual DOS Protected Mode Interface (VDPMI) device driver provides Version 0.9 DPMI support for virtual DOS machines. Win16 provides Version 1.0 DPMI support, but reported as 0.9.

2021/08/05 12:15 · prokushev

Int 31H, AH=09H, AL=02H

Version

0.9

Brief

Get Virtual Interrupt State

Input

AX = 0902H
  

Return

Carry flag = clear (this function always succeeds)
AL = 0 if virtual interrupts are disabled
AL = 1 if virtual interrupts are enabled

Notes

This function should be used in preference to the PUSHF instruction to examine the interrupt flag, because the PUSHF instruction returns the physical interrupt flag rather than the virtualized (per-client) interrupt flag. On some DPMI hosts, the physical interrupt flag will always be enabled, even when hardware interrupts are not being passed through to the client.

See also

Note

DPMI
Process manager INT 2FH 1680H, 1687H
Signals
Memory manager
Misc INT 2FH 1686H, 168AH
Devices
2021/08/13 16:23 · prokushev

en/docs/dpmi/api/int31/09/02.txt · Last modified: 2021/08/27 08:21 by prokushev