[comp.windows.ms] himem.sys 2.60 and three bugs

mdlawler@bsu-cs.bsu.edu (Michael D. Lawler) (07/09/90)

Checksum: 1627469037 (verify with brik -cv)

I have found three bugs in himem.sys 2.60 that I will outline in this
article.  They are (1) himem.sys 2.60 doesn't correctly support the
resize function which will cause it to incorrectly assign handles, (2)
it doesn't correctly preserve the 32-bit AX register which can cause problems
on 386 machines, and (3) the interrupt 15 handler incorrectly assumes
the state of interrupts which can cause conflicts between himem.sys
and the keyboard controller chip.  I think that himem.sys does an
iret instead of a far ret.  It either incorrectly assumes the 
interrupts are always off or on.  I think that it assumes that they
are off.

The information below is about the handles bug and the xmstest.exe program.
Note that the first handle is numbered 2848 with himem.sys 2.60 and that
since the handles take 6 bytes of memory that the handle numbers increase
by 6 I.E. 2848, 2854, 2860, ....  Use xmstest.exe menu selection 1 to 
allocate all of your xms memory.  For this example lets say that you have
3456 K of xms like I do.  Then use menu selection 5 to resize handle 2848
down to 3436 K.  Then use menu selection 1 to allocate the 20 K that you 
freeed up by resizing the 3456 K block down to 3436 K.  Repeat this procedure
and note that the handle numbers start incrementing by 12 instead of 6 after
the second or third resize.  Note that himem.sys will goahead and use the
handles it skips after it has run out of handles if it doesn't have to do
a resize to use them.  Note that the first handle number is only 2848 on
my machine it might very on others.  Please run xmstest and email your
results to me.  Maybe if enough people are made aware of these bugs
then Microsoft will fix them.

section 1 of uuencode 4.02 of file xmstest.exe    by R.E.M.

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end
sum -r/size 16096/11991 section (from "begin" to "end")
sum -r/size 5889/8544 entire input file
-- 
Mike Lawler         UUCP:  <backbones>!{iuvax,pur-ee}!bsu-cs!mdlawler
                    ARPA:  mdlawler@bsu-cs.bsu.edu

davidr@hplsla.HP.COM (David M. Reed) (07/20/90)

I have a different problem with HIMEM.SYS that came with MSWindows3.
I have MSWindows3 installed in a 25 MHz 80386 system with MS-DOS 4.01.
If I use HIMEM then I am unable to open a "DOS Prompt" window.  If I
do not use HIMEM, or use an older version (such as from MSWindows/386)
then I can open a COMMAND.COM window.  But with the new HIMEM (needed
for full implementation of MSWindows3 Enhanced mode), if I try to start
up COMMAND.COM (via selecting it with a mouse, or selecting "DOS Prompt"
in the Program Manager, or even after defining a PIF), the screen clears,
and then is immediately repainted with MSWindows, and MSWindows pops up
an "Insufficient memory" message.

Just going to the DOS directory in File Manager and selecting various
executables, there are some that run just fine, others generate a message
of improper usage (expecting parameters), or report "Insufficient memory"
in the cleared screen before MSWindows is repainted.  It is only with
COMMAND.COM that MSWindows reports insufficient memory.  Programs like
MAPMEM report over 525 KBytes of free memory when they run from MSWindows.

I have re-installed MS-DOS and MSWindows several times.  Generally, 
everything seems to behave properly (other MSWindows and non-Windows
programs) within MSWindows3.  ONLY COMMAND.COM has a problem.  Even when
booting with a very minimal CONFIG.SYS and AUTOEXEC.BAT.  (That is how
it was determined that the problem is related to HIMEM.SYS.)  

Suggestions?