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[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.

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svn path=/trunk/; revision=67549
This commit is contained in:
Hermès Bélusca-Maïto 2015-05-05 00:11:43 +00:00
parent 26aa5486a1
commit 0048c572a0
1 changed files with 24 additions and 5 deletions
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29
reactos/subsystems/mvdm/ntvdm/bios/bios32/bios32.c
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@ -619,6 +619,30 @@ Bios32Post(VOID)
/* 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 @@ static VOID WINAPI Bios32ResetBop(LPWORD Stack)
/* 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();