[hbelusca] 68638: [NTVDM]: Addendum to r68609 (explicitely mention that the CS segment is the one of the caller). Add a debug print.

Author: hbelusca
Date: Sat Aug  8 17:27:23 2015
New Revision: 68638

URL: http://svn.reactos.org/svn/reactos?rev=68638&view=rev
Log:
[NTVDM]: Addendum to r68609 (explicitely mention that the CS segment is the one of the
caller). Add a debug print.

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

Modified: trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/dos/…
==============================================================================
--- 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] Sat Aug  8
17:27:23 2015
@@ -182,7 +182,10 @@
 
 VOID WINAPI DosInt20h(LPWORD Stack)
 {
-    /* This is the exit interrupt */
+    /*
+     * This is the exit interrupt (alias to INT 21h, AH=00h).
+     * CS must be the PSP segment.
+     */
     DosTerminateProcess(Stack[STACK_CS], 0, 0);
 }
 
@@ -204,6 +207,7 @@
         /* Terminate Program */
         case 0x00:
         {
+            /* CS must be the PSP segment */
             DosTerminateProcess(Stack[STACK_CS], 0, 0);
             break;
         }
@@ -563,6 +567,7 @@
         /* Create New PSP */
         case 0x26:
         {
+            /* DOS 2+ assumes that the caller's CS is the segment of the PSP to copy
*/
             DosClonePsp(getDX(), Stack[STACK_CS]);
             break;
         }
@@ -2096,7 +2101,11 @@
 
 VOID WINAPI DosInt27h(LPWORD Stack)
 {
-    DosTerminateProcess(Stack[STACK_CS], 0, (getDX() + 0x0F) >> 4);
+    WORD KeepResident = (getDX() + 0x0F) >> 4;
+
+    /* Terminate and Stay Resident. CS must be the PSP segment. */
+    DPRINT1("Process going resident: %u paragraphs kept\n", KeepResident);
+    DosTerminateProcess(Stack[STACK_CS], 0, KeepResident);
 }
 
 VOID WINAPI DosIdle(LPWORD Stack)