osfree-project / win16

osFree Windows Kernel for osFree Win16 Personality

osFree Windows Kernel

This is attempt to reimplement 16-bit Windows kernel for usage in VDM. It is heavely reuses TWIN, WINE and HX-DOS. As well as Mett Pietrek "Windows Internals" and Andrew Schulman "Undocumented Windows" book heavy used to reconstruct Kernel internal structure.

Design

Because original OS/2 uses mostly unchanged Windows so you can consider this is reimplementation of vanilla Windows 3.x. This means most of code is written to start without any underline system, like Win32 or XFree or something like this. KRNL286/386 must start from pure DOS and start working.

Most of initialization code and module manager are from HX-DOS. HX-DOS is a staring base for implementation.

Most other API functions taken from Wine and TWIN, depending on how hard to port to pure 16-bit environment. Many functions ported back to pure DOS 16-bit environment.

Status

Very-very alpha development stage. GDI and USER not handled at all. Most of higher level dll also not implemented.

First goal is to correctly start simple program like WinVer or something like this. This means KERNEL must correctly load and initialise drivers (system, mouse, keyboard) and GDI.EXE with USER.EXE.

Dirs

resources	Icons, bitmaps, cursors from TWIN, fonts from Wine
dlls		Standard Windows DLLs
doc			Some documentation. Mostly outdated and for reference only.
dosx		286 DOS Extender
drivers		Standard Windows drivers
include		Include files. For reference only.
kernel		KERNEL.EXE/KRNL286.EXE/KRNL386.EXE - new kernel
mmsystem
multimedia
pal			Platform Abstration Layer - drivers for X11 (not used, for reference only)
programs	Standard Windows programs. Mix of TWIN, Wine sources, as well as MS File Manager
samples		Various Sample programs
tests		WIN16 unit tests
tools		various tools
user    USER.EXE
utilities
win			WIN.COM - Windows loader
winkrnl		TWIN Windows kernel, gdi, user. For reference only. Current kernel in kernel directory.

win16's Issues

WIN.COM pass garbage in command line to DOSX/WIN386

On second execution WIN.COM pass garbage in command line to DOSX.EXE or WIN386.EXE. DOSX.EXE freeze, WIN386.EXE passes control to KERNL386.EXE which reports "Can't execute "sdg363g4T@##" program".

expand.exe: does not verify the file size as given by the header after expanding the file

Add support of RLE to logo.lgo

To be possible to add bitmap to win.com it is required to add RLE decompressor.

KRNL286.exe doesn't work under hdpmi16

Change DOSX to support KRNL386

If 386 CPU used, then DOSX.EXE must load KRNL386.EXE, KRNL286.EXE otherwise.

replace usage of fLoadMod flag by copy creation of modulename

Because it possible to ba a problems with multitasking.

Add bitmap size check to logo.lgo

For now no any checks. Just assumes image is for VGA mode 13.

Fix HDPMI16 port

Need to replace attempt to backport to 16-bit cpu by original version (something wrong with backport, but don't want waste time for debugging).

Implement WinExec

Implement WinExec using Wine sources...

Taskmgr doesn't appear after any command

Task list window shown second time only if close window. After any command window doesn't appear

Add command line parser to win.com

For now win.com doesn't allow to select Windows mode. Only autodetection.

Add to DOSX support of command line pass to Windows kernel

According sources, command line passed to kernel except first parameter. Need to change it to pass cmdline to kernel in same way as in original. Need to investigate this.

Add execution of WSWAP.EXE/DSWAP.EXE

Add execution of task swapper to win.com to allow execute DOS programs. Needed for 3.1 and higher. For 3.0 not needed. Seems WSWAP executed by win.com, and wswap executes dosx.exe.

expand.exe: does not validate that the file is actually compressed by reading the signature