v2.23

Author: Baron-von-Riedesel

HXsrc.txt

@@ -95,6 +95,7 @@
 
   4. History
 
+  13.10.2025, V2.23: -
   23.03.2025, V2.22: -
   08.02.2024, V2.21: -
   28.01.2023, V2.20: -

Src/HDPMI/HDPMI.TXT

@@ -1,6 +1,6 @@
 //////////////////////////////////////////////////////////////////////////////
 /                                                                            /
-/               HDPMI - DPMI Server (Version 3.22)                           /
+/               HDPMI - DPMI Server (Version 3.23)                           /
 /                                                                            /
 //////////////////////////////////////////////////////////////////////////////
 

Src/HDPMI/HDPMIHIS.TXT

@@ -1,7 +1,7 @@
 
  History HDPMI 
 
-  __.__.2025, version 3.23
+  13.10.2025, version 3.23
 
   � fixed int 25h/26h, cx != -1: don't copy (non-existing) diskio struct to
     TLB!
@@ -16,9 +16,9 @@
   � setting HDPMI=8192 now runs an INT3 instead of setting the trace flag.
   � fixed regression in v3.22: interrupts are no longer masked during exc
     display, since this may have caused the system to freeze.
-  � fixed: clear IF in current flags for int 31h, ax=302h, alike ax=300h.
-  � fixed: ensure that the real-mode part of int 31h, ax=301h is fully
-    reentrant.
+  � fixed int 31h, ax=302h: clear IF in current flags, similar to ax=300h.
+  � fixed int 31h, ax=301h: real-mode CS:IP was stored in a global variable
+    and may have been overwritten if IF=1.
 
   24.03.2025, version 3.22
 

Src/HDPMI/I31SWT.ASM

@@ -21,7 +21,7 @@
 ?CLEARDIR	= 0	;std=0, 1=clear direction flag on RMCBs
 ?NOREENTRY	= 1	;std=1, 1=dont enter pm if exception handler runs
 
-?SAFERMCALL	equ 1	;v3.23: protect rm call address for function 301h
+?SAFE301	equ 1	;v3.23: protect rm call address for function 301h
 
 ?RMCBMAX	equ 10h	;std=10h, max number of real mode callbacks
 
@@ -524,7 +524,7 @@ endif
 	movzx ebx, bl
 	mov esi, es:[ebx*4]
 havecsip:
-if ?SAFERMCALL
+if ?SAFE301
 	sub eax,5*2
 	mov es:[edx+eax],esi
 	mov es:[edx+eax+4],cx			;flags (will be popped by an IRET)
@@ -580,7 +580,7 @@ error1x:
 
 _TEXT16 segment
 callrmproc_rm:
-if ?SAFERMCALL
+if ?SAFE301
 	iret
 callrmproc_rm2:
 else

Src/HDPMI/Regression/Readme.txt

@@ -38,6 +38,8 @@ I3102103: causes page fault in host, and tries to handle it in exc handler
 I3103001: test int 31h, ax=0300h, simple
 I3103002: test int 31h, ax=0300h, more complex
 I3103011: test int 31h, ax=0301h (call real-mode far proc), 2 words on stack
+I3103016: test int 31h, ax=0301h reentrancy (fixed in v3.23)
+I3103022: test int 31h, ax=0302h IF on real-mode entry (fixed in v3.23)
 I3105032: test int 31h, ax=0503h (resize mem block)
 I310508 : test int 31h, ax=0508h (map phys. device/memory)
 I310508a: test int 31h, ax=0508h (change from mapped to committed)

Src/HDPMI/Regression/Regression.zip

@@ -1,5 +1,5 @@
 
-  __.__.____: version 3.11
+  13.10.2025: version 3.11
 
   � fixed: unaligned access in exception handler caused a stack error if
     alignment exception (0x11) occured.