[aandrejevic] 67623: [FAST486] Fix LTR.

Author: aandrejevic
Date: Sun May 10 14:34:28 2015
New Revision: 67623

URL: http://svn.reactos.org/svn/reactos?rev=67623&view=rev
Log:
[FAST486]
Fix LTR.

Modified:
    trunk/reactos/lib/fast486/opgroups.c

Modified: trunk/reactos/lib/fast486/opgroups.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/lib/fast486/opgroups.c?rev=...
==============================================================================
--- trunk/reactos/lib/fast486/opgroups.c	[iso-8859-1] (original)
+++ trunk/reactos/lib/fast486/opgroups.c	[iso-8859-1] Sun May 10 14:34:28 2015
@@ -1945,7 +1945,10 @@
                 return;
             }

-            if (GdtEntry.Signature != FAST486_TSS_SIGNATURE)
+            if (GdtEntry.Signature != FAST486_TSS_SIGNATURE
+                && GdtEntry.Signature != FAST486_BUSY_TSS_SIGNATURE
+                && GdtEntry.Signature != FAST486_TSS_16_SIGNATURE
+                && GdtEntry.Signature != FAST486_BUSY_TSS_16_SIGNATURE)
             {
                 /* This is not a TSS descriptor */
                 Fast486ExceptionWithErrorCode(State, FAST486_EXCEPTION_GP, Selector);
@@ -1961,6 +1964,18 @@
             {
                 State->TaskReg.Limit <<= 12;
                 State->TaskReg.Limit |= 0x00000FFF;
+            }
+
+            if (GdtEntry.Signature != FAST486_BUSY_TSS_SIGNATURE
+                && GdtEntry.Signature != FAST486_BUSY_TSS_16_SIGNATURE)
+            {
+                /* Set the busy bit of this TSS descriptor and write it back */
+                GdtEntry.Signature |= 2;
+
+                Fast486WriteLinearMemory(State,
+                                         State->Gdtr.Address + GET_SEGMENT_INDEX(Selector),
+                                         &GdtEntry,
+                                         sizeof(GdtEntry));
             }

break;