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DOSKRNL

osFree DOS Kernel (DOSKRNL) based on FreeDOS kernel.

The DOSKRNL implements the core MS/PC-DOS (R) compatible functions for Multiple Virtual Machine. It is derived from The FreeDOS kernel which, in turn, is derived from Pat Villani's DOS-C kernel and released under the GPL v2.

Memory model

Unlike FreeDOS kernel DOSKRNL uses RAW file and two group model. Whole image consist of DGROUP and I_GROUP. I_GROUP moved to hight conventional memory on init. HMA_* segments moved HMA if XMS initialization was ok. If not, then HMA resides at low addresses.

Main targets/To Do

  • Integrate to osFree build system
  • Remove CONFIG structure (We don't need it for DOSKRNL, may be LBA only)
  • Rework initialization (use DOSKRNL init structure, XMS VDD initialization
  • Remove XMS handling from CONFIG.SYS) and HMA relocation
  • Use stack, passed in on init, not init_tos stack
  • Remove CONFIG.SYS parsing (DOSKRNL uses settings from properties) as well as device driver loading from settings
  • Implement virtual device driver init via init structure
  • Implement DOS device driver loading via init structure
  • Implement DOS Properties/Settings support
  • Replace FAT FS by calls to OS/2 host (Seems SVC must be used here)
  • Implement MVDM extensions to API (see RBIL for more information)
  • Drop-in replacement of DOSKRNL