[aandrejevic] 60696: [SOFT386] Implement the hardware interrupt system. Modify Soft386Interrupt to assume hardware interrupts, because software interrupts from outside the emulator may cause race c...

Author: aandrejevic
Date: Fri Oct 18 22:50:00 2013
New Revision: 60696

URL: http://svn.reactos.org/svn/reactos?rev=60696&view=rev
Log:
[SOFT386]
Implement the hardware interrupt system.
Modify Soft386Interrupt to assume hardware interrupts, because
software interrupts from outside the emulator may cause race conditions.

Modified:
    branches/ntvdm/include/reactos/libs/soft386/soft386.h
    branches/ntvdm/lib/soft386/soft386.c
    branches/ntvdm/subsystems/ntvdm/emulator.c

Modified: branches/ntvdm/include/reactos/libs/soft386/soft386.h
URL: http://svn.reactos.org/svn/reactos/branches/ntvdm/include/reactos/libs/soft3...
==============================================================================
--- branches/ntvdm/include/reactos/libs/soft386/soft386.h	[iso-8859-1] (original)
+++ branches/ntvdm/include/reactos/libs/soft386/soft386.h	[iso-8859-1] Fri Oct 18 22:50:00 2013
@@ -342,6 +342,7 @@
     ULONG PrefixFlags;
     SOFT386_SEG_REGS SegmentOverride;
     BOOLEAN HardwareInt;
+    UCHAR PendingIntNum;
 };

/* FUNCTIONS ******************************************************************/
@@ -372,7 +373,7 @@

VOID
 NTAPI
-Soft386Interrupt(PSOFT386_STATE State, UCHAR Number, BOOLEAN Hardware);
+Soft386Interrupt(PSOFT386_STATE State, UCHAR Number);

VOID
 NTAPI

Modified: branches/ntvdm/lib/soft386/soft386.c
URL: http://svn.reactos.org/svn/reactos/branches/ntvdm/lib/soft386/soft386.c?rev=...
==============================================================================
--- branches/ntvdm/lib/soft386/soft386.c	[iso-8859-1] (original)
+++ branches/ntvdm/lib/soft386/soft386.c	[iso-8859-1] Fri Oct 18 22:50:00 2013
@@ -56,8 +56,30 @@
     /* Main execution loop */
     do
     {
-        /* If this is a new instruction, save the IP */
-        if (State->PrefixFlags == 0) State->SavedInstPtr = State->InstPtr;
+        /* Check if this is a new instruction */
+        if (State->PrefixFlags == 0)
+        {
+            State->SavedInstPtr = State->InstPtr;
+
+            /* Check if interrupts are enabled and there is an interrupt pending */
+            if (State->Flags.If && State->HardwareInt)
+            {
+                SOFT386_IDT_ENTRY IdtEntry;
+
+                /* Get the interrupt vector */
+                if (Soft386GetIntVector(State, State->PendingIntNum, &IdtEntry))
+                {
+                    /* Perform the interrupt */
+                    Soft386InterruptInternal(State,
+                                             IdtEntry.Selector,
+                                             MAKELONG(IdtEntry.Offset, IdtEntry.OffsetHigh),
+                                             IdtEntry.Type);
+                }
+
+                /* Clear the interrupt pending flag */
+                State->HardwareInt = FALSE;
+            }
+        }

/* Perform an instruction fetch */
         if (!Soft386FetchByte(State, &Opcode)) continue;
@@ -273,27 +295,11 @@

VOID
 NTAPI
-Soft386Interrupt(PSOFT386_STATE State, UCHAR Number, BOOLEAN Hardware)
-{
-    SOFT386_IDT_ENTRY IdtEntry;
-
-    if (Hardware)
-    {
-        /* Set the hardware interrupt flag */
-        State->HardwareInt = TRUE;
-    }
-
-    if (!Soft386GetIntVector(State, Number, &IdtEntry))
-    {
-        /* An exception occurred, let the handler execute */
-        return;
-    }
-
-    /* Perform the interrupt */
-    Soft386InterruptInternal(State,
-                             IdtEntry.Selector,
-                             MAKELONG(IdtEntry.Offset, IdtEntry.OffsetHigh),
-                             IdtEntry.Type);
+Soft386Interrupt(PSOFT386_STATE State, UCHAR Number)
+{
+    /* Set the hardware interrupt flag */
+    State->HardwareInt = TRUE;
+    State->PendingIntNum = Number;
 }

VOID

Modified: branches/ntvdm/subsystems/ntvdm/emulator.c
URL: http://svn.reactos.org/svn/reactos/branches/ntvdm/subsystems/ntvdm/emulator....
==============================================================================
--- branches/ntvdm/subsystems/ntvdm/emulator.c	[iso-8859-1] (original)
+++ branches/ntvdm/subsystems/ntvdm/emulator.c	[iso-8859-1] Fri Oct 18 22:50:00 2013
@@ -473,7 +473,7 @@
     softx86_make_simple_interrupt_call(&EmulatorContext, &Segment, &Offset);
 #else
     /* Call the Soft386 API */
-    Soft386Interrupt(&EmulatorContext, Number, FALSE);
+    Soft386Interrupt(&EmulatorContext, Number);
 #endif
 }

@@ -484,7 +484,7 @@
     softx86_ext_hw_signal(&EmulatorContext, Number);
 #else
     /* Call the Soft386 API */
-    Soft386Interrupt(&EmulatorContext, Number, TRUE);
+    Soft386Interrupt(&EmulatorContext, Number);
 #endif
 }