[tfaber] 71967: [NTOS:KE] - Load LDT on context switch if required. CORE-11511 #resolve

Author: tfaber
Date: Tue Jul 19 12:51:49 2016
New Revision: 71967

URL: http://svn.reactos.org/svn/reactos?rev=71967&view=rev
Log:
[NTOS:KE]
- Load LDT on context switch if required.
CORE-11511 #resolve

Modified:
    trunk/reactos/ntoskrnl/ke/i386/context.c
    trunk/reactos/ntoskrnl/ke/i386/ldt.c
    trunk/reactos/ntoskrnl/ke/i386/thrdini.c

Modified: trunk/reactos/ntoskrnl/ke/i386/context.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ke/i386/context.c?...
==============================================================================
--- trunk/reactos/ntoskrnl/ke/i386/context.c	[iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/ke/i386/context.c	[iso-8859-1] Tue Jul 19 12:51:49 2016
@@ -34,9 +34,17 @@
     /* Check for new LDT */
     if (NewProcess->LdtDescriptor.LimitLow != OldProcess->LdtDescriptor.LimitLow)
     {
-        /* Not handled yet */
-        UNIMPLEMENTED_DBGBREAK();
-        return;
+        if (NewProcess->LdtDescriptor.LimitLow)
+        {
+            KeSetGdtSelector(KGDT_LDT,
+                             ((PULONG)&NewProcess->LdtDescriptor)[0],
+                             ((PULONG)&NewProcess->LdtDescriptor)[1]);
+            Ke386SetLocalDescriptorTable(KGDT_LDT);
+        }
+        else
+        {
+            Ke386SetLocalDescriptorTable(0);
+        }
     }

/* Update CR3 */

Modified: trunk/reactos/ntoskrnl/ke/i386/ldt.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ke/i386/ldt.c?rev=...
==============================================================================
--- trunk/reactos/ntoskrnl/ke/i386/ldt.c	[iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/ke/i386/ldt.c	[iso-8859-1] Tue Jul 19 12:51:49 2016
@@ -167,7 +167,7 @@
   if ((Base + SegLimit > (ULONG_PTR) MmHighestUserAddress) ||
       (Base > Base+SegLimit))
   {
-    DPRINT1("WARNING: Windows would mark this descriptor invalid!");
+    DPRINT1("WARNING: Windows would mark this descriptor invalid!\n");
   }

/*

Modified: trunk/reactos/ntoskrnl/ke/i386/thrdini.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ke/i386/thrdini.c?...
==============================================================================
--- trunk/reactos/ntoskrnl/ke/i386/thrdini.c	[iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/ke/i386/thrdini.c	[iso-8859-1] Tue Jul 19 12:51:49 2016
@@ -345,8 +345,17 @@
         /* Check if there is a different LDT */
         if (*(PULONGLONG)&OldProcess->LdtDescriptor != *(PULONGLONG)&NewProcess->LdtDescriptor)
         {
-            DPRINT1("LDT switch not implemented\n");
-            ASSERT(FALSE);
+            if (NewProcess->LdtDescriptor.LimitLow)
+            {
+                KeSetGdtSelector(KGDT_LDT,
+                                 ((PULONG)&NewProcess->LdtDescriptor)[0],
+                                 ((PULONG)&NewProcess->LdtDescriptor)[1]);
+                Ke386SetLocalDescriptorTable(KGDT_LDT);
+            }
+            else
+            {
+                Ke386SetLocalDescriptorTable(0);
+            }
         }

/* Switch address space and flush TLB */