en:docs:dpmi

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

DPMI is a shared interface for DOS applications to access Intel 80286+ CPUs services. DOS DMPI host provides core services for protected mode applications. Multitasking OS with DOS support also provides DMPI in most cases. Windows standard and extended mode kernel is a DPMI client app. Standard and extended mode kernel differs minimally and shares common codebase. Standard Windows kernel works under DOSX extender. DOSX is a specialized version of 16-bit DPMI Extender (but it is standard DPMI host). Standard mode is just DPMI client, exnhanced mode is DPMI client running under Virtual Machime Manager (really, multitasker which allow to run many DOS sessions). 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 (up to Windows ME) provides Version 0.9 DPMI support.

DPMI host often merged with DPMI extender. Usually DPMI extender provide DPMI host standard services and DOS translation or True DPMI services.

2021/08/05 12:15 · prokushev

Note: This API implemented by DPMI extenders under DOS and by DOSX.EXE under Windows. Under OS/2 MVDM this API implemented by VDPMI

Interrupt AX Description Version
2f 1680 Release Current Virtual Machine's Time Slice 1.0
2f 1686 Get CPU Mode 0.9
2f 1687 Obtain Real-to-Protected Mode Switch Entry Point 0.9
2f 168A Get Vendor-Specific API Entry Point 1.0
31 0000 Allocate LDT Descriptors 0.9
31 0001 Free LDT Descriptor 0.9
31 0002 Segment to Descriptor 0.9
31 0003 Get Selector Increment Value 0.9
31 0006 Get Segment Base Address 0.9
31 0007 Set Segment Base Address 0.9
31 0008 Set Segment Limit 0.9
31 0009 Set Descriptor Access Rights 0.9
31 000A Create Alias Descriptor 0.9
31 000B Get Descriptor 0.9
31 000C Set Descriptor 0.9
31 000D Allocate Specific LDT Descriptor 0.9
31 000E Get Multiple Descriptors 1.0
31 000F Set Multiple Descriptors 1.0
31 0100 Allocate DOS Memory Block 0.9
31 0101 Free DOS Memory Block 0.9
31 0102 Resize DOS Memory Block 0.9
31 0200 Get Real Mode Interrupt Vector 0.9
31 0201 Set Real Mode Interrupt Vector 0.9
31 0202 Get Processor Exception Handler Vector 0.9
31 0203 Set Processor Exception Handler Vector 0.9
31 0204 Get Protected Mode Interrupt Vector 0.9
31 0205 Set Protected Mode Interrupt Vector 0.9
31 0210 Get Extended Processor Exception Handler Vector (Protected Mode) 1.0
31 0211 Get Extended Processor Exception Handler Vector (Real Mode) 1.0
31 0212 Set Extended Processor Exception Handler Vector (Protected Mode) 1.0
31 0213 Set Extended Processor Exception Handler Vector (Real Mode) 1.0
31 0300 Simulate Real Mode Interrupt 0.9
31 0301 Call Real Mode Procedure With Far Return Frame 0.9
31 0302 Call Real Mode Procedure With IRET Frame 0.9
31 0303 Allocate Real Mode Callback Address 0.9
31 0304 Free Real Mode Callback Address 0.9
31 0305 Get State Save/Restore Addresses 0.9
31 0306 Get Raw Mode Switch Addresses 0.9
31 0400 Get Version 0.9
31 0401 Get DPMI Capabilities 1.0
31 0500 Get Free Memory Information 0.9
31 0501 Allocate Memory Block 0.9
31 0502 Free Memory Block 0.9
31 0503 Resize Memory Block 0.9
31 0504 Allocate Linear Memory Block 1.0
31 0505 Resize Linear Memory Block 1.0
31 0506 Get Page Attributes 1.0
31 0507 Set Page Attributes 1.0
31 0508 Map Device in Memory Block 1.0
31 0509 Map Conventional Memory in Memory Block 1.0
31 050A Get Memory Block Size and Base 1.0
31 050B Get Memory Information 1.0
31 0600 Lock Linear Region 0.9
31 0601 Unlock Linear Region 0.9
31 0602 Mark Real Mode Region as Pageable 0.9
31 0603 Relock Real Mode Region 0.9
31 0604 Get Page Size 0.9
31 0702 Mark Page as Demand Paging Candidate 0.9
31 0703 Discard Page Contents 0.9
31 0800 Physical Address Mapping 0.9
31 0801 Free Physical Address Mapping 1.0
31 0900 Get and Disable Virtual Interrupt State 0.9
31 0901 Get and Enable Virtual Interrupt State 0.9
31 0902 Get Virtual Interrupt State 0.9
31 0A00 Get Vendor-Specific API Entry Point 0.9
31 0B00 Set Debug Watchpoint 0.9
31 0B01 Clear Debug Watchpoint 0.9
31 0B02 Get State of Debug Watchpoint 0.9
31 0B03 Reset Debug Watchpoint 0.9
31 0C00 Install Resident Service Provider Callback 1.0
31 0C01 Terminate and Stay Resident 1.0
31 0D00 Allocate Shared Memory 1.0
31 0D01 Free Shared Memory 1.0
31 0D02 Serialize on Shared Memory 1.0
31 0D03 Free Serialization on Shared Memory 1.0
31 0E00 Get Coprocessor Status 1.0
31 0E01 Set Coprocessor Emulation 1.0

en/docs/dpmi.txt · Last modified: 2021/08/27 03:30 by prokushev