992a898076
This format has several advantages: * The CONFIG block need not be moved. * The entire compressed image (depacker and payload) need not be moved another time before the UPX depacker's own operation. * The CONFIG block always lives at 00602h, and the kernel need not be aware whether it was compressed for detecting which CONFIG block to use. * Support for compressed images beyond 64 KiB for free. (The assembly define TEST_FILL_INIT_TEXT can be passed in NASMENV to test this support with 32 KiB of LFSR output.) * A subsequent commit will shorten the stub to 64 bytes, compared to the prior 32 + 45 = 77 bytes, with no loss of features. (The packed payload is a bit shorter too.) * The new stub also sets ds and es to the segment value that would point to the DOS/EXE process's PSP. This is apparently not used by the UPX depacker but could be in a future or past version, or if another packer is used.
fd kernel
FreeDOS kernel - current 0xFD version is 2.43 (2043)
The FreeDOS kernel implements the core MS/PC-DOS (R) compatible functions. It is derived from Pat Villani's DOS-C kernel and released under the GPL v2. Please see http://www.freedos.org/ for more details about the FreeDOS (TM) Project. This was originally a branch based on 2042 SVN 0xFD kernel; the full svn history has since been added to git (see other branches) and current development of release kernels are available here. Please fork and submit a Pull Request!
Compiled kernels ready to use (just copy kernel.sys over an existing install) are available at http://www.fdos.org/kernel/testing/git/ - also available are the source archive and fdpkg compatible packages. *** TODO update links/upload archives
This version of the kernel is intended only for 8086+ or 80386+ IBM compatible computers in continuation of the goals of the FreeDOS Project. Please see http://www.fdos.org/kernel for my 0xDC kernel that is work on merging back in some of the original portability aspects and other supported features at the cost of some compatibility with older hardware/software.
Please feel free to email me - PerditionC@gmail.com
Now with automatic builds and soon tests 