High Quality Content by WIKIPEDIA articles! CWSDPMI is a DPMI host written by Charles W Sandmann from 1996 to present, currently at r7. It is loosely based upon prior GO32 code used in DJGPP v1. It can provide DPMI 0.90+ services for programs compiled with latest versions of DJGPP etc. compilers. Since r5, it can also be used for programs requiring a DPMI stub in lieu of PMODE/DJ. It supports 4 GB, virtual memory, and hardware interrupt reflection from real mode to protected mode. Programs compiled with DJGPP 2+ require a DPMI host, which is usually CWSDPMI.EXE or CWSDPR0.EXE. In case of CWSDPMI.EXE, the default paging/virtual memory file is C:CWSDPMI.SWP. It runs in as little as 512 kb of RAM on a 386. CWSDPR0.EXE is an alternate version, implemented at request of id Software when writing Quake, which runs at ring 0 with virtual memory disabled. It may be used if access to ring 0 features are desired. It currently does not switch stacks on hardware interrupts, so some DJGPP features such as SIGINT and SIGFPE are not supported and will generate a double fault or stack fault error.

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