[ros-arm-bringup] 44862: NMI Support Patch 7 Straggler: [HAL]: Piggyback on V8086 handler (don't restore kernel GPF handler) during an NMI, so that we don't enter another fault context during a recursive NMI after display reset. If another NMI does happen, the V8086 GPF handler will just spin.

Author: ros-arm-bringup
Date: Fri Jan  1 22:05:41 2010
New Revision: 44862

URL: http://svn.reactos.org/svn/reactos?rev=44862&view=rev
Log:
NMI Support Patch 7 Straggler:
    [HAL]: Piggyback on V8086 handler (don't restore kernel GPF handler) during an
NMI, so that we don't enter another fault context during a recursive NMI after display
reset. If another NMI does happen, the V8086 GPF handler will just spin.


Modified:
    trunk/reactos/hal/halx86/generic/bios.c

Modified: trunk/reactos/hal/halx86/generic/bios.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/hal/halx86/generic/bios.c?…
==============================================================================
--- trunk/reactos/hal/halx86/generic/bios.c [iso-8859-1] (original)
+++ trunk/reactos/hal/halx86/generic/bios.c [iso-8859-1] Fri Jan  1 22:05:41 2010
@@ -313,9 +313,19 @@
 HalpRestoreTrapHandlers(VOID)
 {
     //
-    // We're back, restore the handlers we over-wrote
-    //
-    KeRegisterInterruptHandler(13, HalpGpfHandler);
+    // Keep dummy GPF handler in case we get an NMI during V8086
+    //
+    if (!HalpNMIInProgress)
+    {
+        //
+        // Not an NMI -- put back the original handler
+        //
+        KeRegisterInterruptHandler(13, HalpGpfHandler);
+    }
+
+    //
+    // Restore invalid opcode handler
+    //
     KeRegisterInterruptHandler(6, HalpBopHandler);
 }