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From: "Rod Pemberton" <dont_use_email AT xnohavenotit DOT cnm>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: resident PMODEDJ?
Date: Mon, 17 Feb 2014 16:59:38 -0500
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On Sat, 15 Feb 2014 04:57:39 -0500, Rod Pemberton  
<dont_use_email AT xnohavenotit DOT cnm> wrote:

> [...]
>
> PMODEDJ's documentation says it will only stay resident
> one time.  Is there a switch, parameter, hidden switch,
> tweak, patch, etc that can be used to make PMODEDJ
> (pmodetsr.exe) stay resident longer?  I.e., permanently.

The patch below allow you to build a resident version of
PMODEDJ.  PMODEDJ is a.k.a. PMODETSR.EXE.

This version is experimental.  Use at your own discretion.

Be warned that I could've introduced any number of unknown
issues, or more likely failed to fix many potential problems
that the program was never coded to handle.

However, preliminary tests seem to indicate that the few
trivial changes below make PMODEDJ resident.

The diff's are against pmode13s.zip available here:
http://www.delorie.com/pub/djgpp/current/v2misc/

I also had an issue with the MAKEFILE failing when TLINK
was executed.  The error complained about 16-bit DPMI ...
So, I made a batch file to build it.  That's below also.

Please don't ask me for additional fixes.


diff -Naur PMODE/pmode.asm PMODE_NEW/pmode.asm
--- PMODE/pmode.asm	2000-10-13 22:09:00.000000000 -0500
+++ PMODE_NEW/pmode.asm	2014-02-17 15:37:58.000000000 -0500
@@ -933,11 +933,11 @@
  ;°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°
  ; [fold]  [
  pm_init:
-	push ax
-	call pm_info
-	pop ax
-	jnc short @@initf0		; error?
-	ret				; yup, abort
+;	push ax
+;	call pm_info
+;	pop ax
+;	jnc short @@initf0		; error?
+;	ret				; yup, abort

  @@initf0:				; no error, init protected mode
  	test ax,2
@@ -2902,10 +2902,10 @@
  	add bx,bx
  	call [exitrouttbl+bx]		; deinit

-	mov es,[privatedataseg]
-	mov ah,49h
-	int 21h				; free private data
-	call [pm_exit]			; user defined cleanup routine
+;	mov es,[privatedataseg]
+;	mov ah,49h
+;	int 21h				; free private data
+;	call [pm_exit]			; user defined cleanup routine
  	pop ax
  	int 21h				; quit

diff -Naur PMODE/pmodetsr.asm PMODE_NEW/pmodetsr.asm
--- PMODE/pmodetsr.asm	1997-02-22 22:18:24.000000000 -0500
+++ PMODE_NEW/pmodetsr.asm	2014-02-17 13:52:50.000000000 -0500
@@ -43,8 +43,8 @@
  ; restore old int 2f vector since pmode is not reentrable and looks at  
int 2f
  	xor	ax,ax
  	mov	ds,ax
-	mov	eax, dword ptr cs:oldint2f
-	mov	ds:[2fh*4], eax		; atomic, cli not needed
+;	mov	eax, dword ptr cs:oldint2f
+;	mov	ds:[2fh*4], eax		; atomic, cli not needed

  	push	DGROUP
  	pop	ds


----------BUILD.BAT

del *.obj
del *.map
del *.exe

gcc -O2 -s padsec.c -o padsec.exe
gcc -O2 -s ehdrfix.c -o ehdrfix.exe

tasm -ml -zi -zn pmode.asm
tasm -ml -zi -zn pmodstub.asm
tasm -ml -zi -zn pmodetsr.asm

tlink -n -c -m -s pmodstub.obj pmode.obj
padsec pmodstub.exe

tlink -n -c -m -s pmodetsr.obj pmode.obj
ehdrfix pmodetsr.exe

----------

HTH,


Rod Pemberton