1999 Mar 28 - Build 2005
-------- ror4 (ror4@usa.net)
* Removed the need for `ipl.sys'. (!) The kernel makefile now
  statically relocates `kernel.exe' to 0x60:0 and outputs the
  resulting binary to `kernel.sys', and the boot sector has also been
  modified to load `kernel.sys' at 0x60:0 instead of `ipl.sys' at
  0x2000:0. (I chose 0x60:0 because it's the first 512-byte boundary
  occurring after the BIOS data area, 0x40:0.) Finally, `sys.com' has
  also been updated.

* Also changed the boot sector code in some other ways. In
  particular, because `kernel.sys' is rather large, I had to add some
  code to move the boot sector away from 0:0x7c00 to somewhere
  higher. (For 640K systems the boot sector will be shifted to
  0x6000:0x7c00. However, there may be problems on systems with very
  little conventional memory -- I'll probably look into this later.)

* Made some minor changes to the assembler source files so that they
  can compile on `masm'. (JP: The code still compiles fine with tasm
  too).

* Also changed several incorrect label references in the assembler
  sources. (JP: These changes fixed the "Fixup" errors we been
  talking about in the list)

* Eliminated redundant re-makes of files in the various makefiles.
  For one thing, `*.cfg' files are no longer generated from the
  makefiles, but are independent from them. (I didn't like the idea
  of having to compile an entire branch each time I edit a
  makefile...) Also, intermediate files are now retained instead of
  deleted.

* Also made some changes to `build.bat' (you'll know them when you
  see them).

* Added a file `lib/libm.mak'

* Added a file `kernel/krnstart

* The code required to initialize the kernel (or rather most of it)
  is no longer retained in memory after the initialization process is
  done. I accomplished this by moving most of the initialization code
  from `_TEXT' to a new segment named `INIT_TEXT'. Of course, I also
  had to introduce lots of other changes in order for everything to
  compile and run properly:
  - Added code to `kernel/src/kernel/kernel.asm' to move the contents
    of `INIT_TEXT' to the top of conventional memory and continue
    from there.  Control is only transferred back to `_TEXT' when the
    kernel calls `p_0'.
  - Many functions are called from both `_TEXT' and `INIT_TEXT'. To
    fix this, I created far wrappers for these functions which can
    then be called from `INIT_TEXT'. (E.g. for `execrh' there's a
    corresponding far function named `init_call_execrh' which simply
    calls `execrh' with its own parameters.) One exception to this is
    `printf' -- instead of creating a far wrapper for a near
    `printf', I created a near wrapper for a far `printf' (now called
    `init_call_printf'), because it was easier that way. :)
  - Most functions which are required only during initialization time
    were shifted into `INIT_TEXT'. (There are still some functions
    which should rightfully go into `INIT_TEXT', but are retained in
    `_TEXT' as far functions, because I found it too difficult to
    move them out. :( ) Because Turbo C only allows at most one code
    segment to be defined for each module, I had to shift some
    functions around within the source tree -- the file
    `kernel/src/kernel/proto.h' says it all.
  - A cosmetic change mentioned here for completeness: all functions
    defined in `INIT_TEXT' are now marked with the word `INIT' (in
    fact a null macro) so that the reader can easily distinguish them
    from functions defined in `_TEXT'.

* Replaced `exit' calls with `for (;;);'.

* Changed `strcpy' into a macro which calls `scopy'.

* Also redefined `setvec' to be a macro (I didn't want to waste time
  writing a far wrapper for it).

* Removed the `break_key' function in `kernel/src/kernel/kernel.asm'.

* `low_int25_handler' and `low_int26_handler' are now of type
  `void interrupt far()' instead of `void near()'. (I hope I updated
  `entry.asm' correctly -- I never tested `int 0x25' and `int 0x26'...)

* Changed the class of `_BSSEND' from "STACK" to "BSS" -- "STACK" is
  now used for a separate stack segment (`_STACK').

* Assembler modules now include `segs.inc' instead of having their
  own long list of segment definitions. (Some day I'll update the
  makefile dependencies to reflect this.)

* Also made a few minor changes to the assembler modules so that
  `masm' won't complain.

* Changed the `-X' switch in `kernel.cfg' to `-X-', so that I don't
  have to worry about C module dependencies.

* Removed the definition of `CFLAGS' from the makefile -- everything
  is now in `kernel.cfg'.

* Created a file `kernel/src/kernel/init-mod.h' which is included by
  modules whose code is supposed to go into `INIT_TEXT' instead of
  `TEXT'.

* This diff solves the problem of the MCB of a process not having a
  correct value in its name field (bug report #6).
  (The definition of the `toupper' macro is because I shifted the
  `toupper' function into `INIT_TEXT' a while ago, and therefore
  can't be called from `_TEXT' now...)


-------- John Price (linux-guru@gcfl.net)
* Made changes so you can create a directory with the same name as a
  volume label, but you still can't rename or delete it!

* Fix findfirst and findnext functions so that act as they should.
  (i.e. If the attrib has only the volume label set, then it returns
  the volume label entry in the root directory, else it returns the
  files/directories that are specified with the attrib, ignoring the
  read-only and archive bits (these are always returned).

* reorginize the source tree.  Removed IPL directory, and command.
  Moved all the file system C files into the kernel directory.
  Modifed build.bat, clean.bat, and all the make files to reflect the
  new tree.

* changed so that kernel will look for a "fdconfig.sys" file, and use
  it INSTEAD of config.sys.  If it does not find it, it will look
  for, and read config.sys, if it exists.

* Fixed so that if you call an INT 21 function with AH containing a
  unsupported function, the carry flag is set.
