Author: hbelusca
Date: Tue May 5 00:11:43 2015
New Revision: 67549
URL: http://svn.reactos.org/svn/reactos?rev=67549&view=rev
Log:
[NTVDM]: Add a debug feature to detect which apps erroneously call by themselves the BIOS initialization routine (POST). For whatever reason it is what MSD version 2 and above does.
Modified:
trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/bios32.c
Modified: trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/bios32.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/bios…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/bios32.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/bios32.c [iso-8859-1] Tue May 5 00:11:43 2015
@@ -619,6 +619,30 @@
/* Set data segment */
setDS(BDA_SEGMENT);
+ /*
+ * Check the word at 0040h:0072h (Bda->SoftReset) and do one of the
+ * following actions:
+ * - if the word is 0000h, perform a cold reboot (aka. Reset). Everything gets initialized.
+ * - if the word is 1234h, perform a warm reboot (aka. Ctrl-Alt-Del). Some stuff is skipped.
+ * In case we do a warm reboot, we need to check for the CMOS shutdown flag
+ * and take a suitable action.
+ */
+
+ // FIXME: This is a debug temporary check:
+ // Since NTVDM memory is by default initialized with 0xCC, it is also
+ // the case for the BDA. So at first boot we get SoftReset == 0xCCCC.
+ // After we zero out the BDA and put valid values in it.
+ // If for some reason an app calls the BIOS initialization code,
+ // SoftReset is normally zero (unless the app puts a non-null value in SoftReset)
+ // and we can detect that. With the current state of NTVDM, apps calling
+ // by hand the BIOS init code is a sign of a bug, e.g. see MSD.EXE version 2+.
+ if (Bda->SoftReset != 0xCCCC)
+ {
+ DisplayMessage(L"NTVDM is performing a COLD reboot! The program you are currently testing seems to not behave correctly! The VDM is stopping...");
+ EmulatorTerminate();
+ return;
+ }
+
/* Initialize the BDA and the BIOS ROM Information */
InitializeBiosData();
InitializeBiosInfo();
@@ -677,11 +701,6 @@
/* Disable interrupts */
setIF(0);
- // FIXME: Check the word at 0040h:0072h (Bda->SoftReset) and do one of the
- // following actions:
- // - if the word is 1234h, perform a warm reboot (aka. Ctrl-Alt-Del);
- // - if the word is 0000h, perform a cold reboot (aka. Reset).
-
/* Do the POST */
Bios32Post();