[fireball] 44947: - Implement SystemException and SystemContextSwitch information cases in NtQuerySystemInformation by Samuel Serapion, modified by me (comments, coding style). See issue #5054 for more details.

Author: fireball
Date: Tue Jan  5 17:28:47 2010
New Revision: 44947

URL: http://svn.reactos.org/svn/reactos?rev=44947&view=rev
Log:
- Implement SystemException and SystemContextSwitch information cases in
NtQuerySystemInformation by Samuel Serapion, modified by me (comments, coding style).
See issue #5054 for more details.

Modified:
    trunk/reactos/ntoskrnl/ex/sysinfo.c

Modified: trunk/reactos/ntoskrnl/ex/sysinfo.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ex/sysinfo.c?rev=…
==============================================================================
--- trunk/reactos/ntoskrnl/ex/sysinfo.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/ex/sysinfo.c [iso-8859-1] Tue Jan  5 17:28:47 2010
@@ -1467,9 +1467,35 @@
 /* Class 33 - Exception Information */
 QSI_DEF(SystemExceptionInformation)
 {
-    /* FIXME */
-    DPRINT1("NtQuerySystemInformation - SystemExceptionInformation not
implemented\n");
-    return STATUS_NOT_IMPLEMENTED;
+    PSYSTEM_EXCEPTION_INFORMATION ExceptionInformation =
+        (PSYSTEM_EXCEPTION_INFORMATION)Buffer;
+    PKPRCB Prcb;
+    ULONG i, AlignmentFixupCount = 0, ExceptionDispatchCount = 0;
+    ULONG FloatingEmulationCount = 0, ByteWordEmulationCount = 0;
+
+    /* Check size of a buffer, it must match our expectations */
+    if (sizeof(SYSTEM_EXCEPTION_INFORMATION) != Size)
+        return STATUS_INFO_LENGTH_MISMATCH;
+
+    /* Sum up exception count information from all processors */
+    for (i = 0; i < KeNumberProcessors; i++)
+    {
+        Prcb = KiProcessorBlock[i];
+        if (Prcb)
+        {
+            AlignmentFixupCount += Prcb->KeAlignmentFixupCount;
+            ExceptionDispatchCount += Prcb->KeExceptionDispatchCount;
+            FloatingEmulationCount += Prcb->KeFloatingEmulationCount;
+        }
+    }
+
+    /* Save information in user's buffer */
+    ExceptionInformation->AlignmentFixupCount = AlignmentFixupCount;
+    ExceptionInformation->ExceptionDispatchCount = ExceptionDispatchCount;
+    ExceptionInformation->FloatingEmulationCount = FloatingEmulationCount;
+    ExceptionInformation->ByteWordEmulationCount = ByteWordEmulationCount;
+
+    return STATUS_SUCCESS;
 }
 
 /* Class 34 - Crash Dump State Information */
@@ -1500,9 +1526,42 @@
 /* Class 36 - Context Switch Information */
 QSI_DEF(SystemContextSwitchInformation)
 {
-    /* FIXME */
-    DPRINT1("NtQuerySystemInformation - SystemContextSwitchInformation not
implemented\n");
-    return STATUS_NOT_IMPLEMENTED;
+    PSYSTEM_CONTEXT_SWITCH_INFORMATION ContextSwitchInformation =
+        (PSYSTEM_CONTEXT_SWITCH_INFORMATION)Buffer;
+    ULONG ContextSwitches, i;
+    PKPRCB Prcb;
+
+    /* Check size of a buffer, it must match our expectations */
+    if (sizeof(SYSTEM_CONTEXT_SWITCH_INFORMATION) != Size)
+        return STATUS_INFO_LENGTH_MISMATCH;
+
+    /* Calculate total value of context switches across all processors */
+    ContextSwitches = 0;
+    for (i = 0; i < KeNumberProcessors; i ++)
+    {
+        Prcb = KiProcessorBlock[i];
+        if (Prcb)
+        {
+            ContextSwitches += KeGetContextSwitches(Prcb);
+        }
+    }
+
+    ContextSwitchInformation->ContextSwitches = ContextSwitches;
+
+    /* FIXME */
+    ContextSwitchInformation->FindAny = 0;
+    ContextSwitchInformation->FindLast = 0;
+    ContextSwitchInformation->FindIdeal = 0;
+    ContextSwitchInformation->IdleAny = 0;
+    ContextSwitchInformation->IdleCurrent = 0;
+    ContextSwitchInformation->IdleLast = 0;
+    ContextSwitchInformation->IdleIdeal = 0;
+    ContextSwitchInformation->PreemptAny = 0;
+    ContextSwitchInformation->PreemptCurrent = 0;
+    ContextSwitchInformation->PreemptLast = 0;
+    ContextSwitchInformation->SwitchToIdle = 0;
+
+    return STATUS_SUCCESS;
 }
 
 /* Class 37 - Registry Quota Information */