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.
Int 31H, AH=00H, AL=0EH
Get Multiple Descriptors
AX = 000EH CX = number of descriptors to copy ES:(E)DI = selector:offset of a buffer in the following format:
|00H||2||Selector #1 (set by client)|
|02H||8||Descriptor #1 (returned by host)|
|0AH||2||Selector #2 (set by client)|
|0CH||8||Descriptor #2 (returned byhost)|
if function successful Carry flag = clear and buffer contains copies of the descriptors for the specified selectors if function unsuccessful Carry flag = set AX = error code 8022H invalid selector CX = number of descriptors successfully copied
Copies one or more local descriptor table (LDT) entries into a client buffer.
If an error occurs because of an invalid selector or descriptor, the function returns the number of descriptors which were successfully copied in CX. All of the descriptors which were copied prior to the one that failed are valid.
32-bit programs must use ES:EDI to point to the buffer. 16-bit programs should use ES:DI.
Refer to the rules for descriptor usage in Appendix D.
Text based on http://www.delorie.com/djgpp/doc/dpmi/