[aandrejevic] 68028: [NTVDM] - Implement the DOS idle interrupt. - Link to the parent's environment block by default in DosCreatePsp. - Fix INT 21h/36h (Get Free Space) to report 0xFFFF if the numb...

Author: aandrejevic
Date: Fri Jun  5 22:22:04 2015
New Revision: 68028

URL: http://svn.reactos.org/svn/reactos?rev=68028&view=rev
Log:
[NTVDM]
- Implement the DOS idle interrupt.
- Link to the parent's environment block by default in DosCreatePsp.
- Fix INT 21h/36h (Get Free Space) to report 0xFFFF if the number
of clusters is too high to fit in a word.

Modified:
    trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c
    trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/process.c

Modified: trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/dos/d...
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c	[iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c	[iso-8859-1] Fri Jun  5 22:22:04 2015
@@ -825,8 +825,8 @@
             {
                 setAX(LOWORD(SectorsPerCluster));
                 setCX(LOWORD(BytesPerSector));
-                setBX(LOWORD(NumberOfFreeClusters));
-                setDX(LOWORD(TotalNumberOfClusters));
+                setBX(min(NumberOfFreeClusters, 0xFFFF));
+                setDX(min(TotalNumberOfClusters, 0xFFFF));
             }
             else
             {
@@ -1871,6 +1871,15 @@
 VOID WINAPI DosInt27h(LPWORD Stack)
 {
     DosTerminateProcess(getCS(), 0, (getDX() + 0x0F) >> 4);
+}
+
+VOID WINAPI DosIdle(LPWORD Stack)
+{
+    /*
+     * This will set the carry flag on the first call (to repeat the BOP),
+     * and clear it in the next, so that exactly one HLT occurs.
+     */
+    setCF(!getCF());
 }

VOID WINAPI DosFastConOut(LPWORD Stack)
@@ -2070,10 +2079,13 @@
     RegisterDosInt32(0x23, DosBreakInterrupt); // Ctrl-C / Ctrl-Break
 //  RegisterDosInt32(0x24, DosInt24h        ); // Critical Error
     RegisterDosInt32(0x27, DosInt27h        ); // Terminate and Stay Resident
+    RegisterDosInt32(0x28, DosIdle          ); // DOS Idle Interrupt
     RegisterDosInt32(0x29, DosFastConOut    ); // DOS 2+ Fast Console Output
     RegisterDosInt32(0x2F, DosInt2Fh        );

/* Unimplemented DOS interrupts */
+    RegisterDosInt32(0x25, NULL); // Absolute Disk Read
+    RegisterDosInt32(0x26, NULL); // Absolute Disk Write
     RegisterDosInt32(0x2A, NULL); // Network - Installation Check

/* Load the CON driver */

Modified: trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/process.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/dos/d...
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/process.c	[iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/process.c	[iso-8859-1] Fri Jun  5 22:22:04 2015
@@ -212,8 +212,11 @@
     /* Set the parent PSP */
     PspBlock->ParentPsp = Sda->CurrentPsp;

-    /* No environment block yet */
-    PspBlock->EnvBlock = 0;
+    if (Sda->CurrentPsp != SYSTEM_PSP)
+    {
+        /* Link to the parent's environment block */
+        PspBlock->EnvBlock = SEGMENT_TO_PSP(Sda->CurrentPsp)->EnvBlock;
+    }

/* Copy the parent handle table */
     DosCopyHandleTable(PspBlock->HandleTable);