--- xnu/xnu-4570.41.2/iokit/Kernel/IOStartIOKit.cpp
+++ xnu/xnu-2050.9.2/iokit/Kernel/IOStartIOKit.cpp
@@ -42,24 +42,16 @@
 #include <IOKit/pwr_mgt/IOPMinformeeList.h>
 #include <IOKit/IOStatisticsPrivate.h>
 #include <IOKit/IOKitKeysPrivate.h>
-#include <IOKit/IOInterruptAccountingPrivate.h>
+
 #include <IOKit/assert.h>
-#include <sys/conf.h>
 
 #include "IOKitKernelInternal.h"
 
-const OSSymbol * gIOProgressBackbufferKey;
-OSSet *          gIORemoveOnReadProperties;
-
 extern "C" {
-
-void StartIOKit( void * p1, void * p2, void * p3, void * p4 );
-void IORegistrySetOSBuildVersion(char * build_version);
-void IORecordProgressBackbuffer(void * buffer, size_t size, uint32_t theme);
 
 extern void OSlibkernInit (void);
 
-void iokit_post_constructor_init(void);
+void iokit_post_constructor_init(void) __attribute__((section("__TEXT, initcode")));
 
 #include <kern/clock.h>
 #include <sys/time.h>
@@ -77,7 +69,21 @@
 		IOService::resourceMatching("IONVRAM"), &t );
 #endif
 
-	clock_initialize_calendar();
+    clock_initialize_calendar();
+}
+
+void IOKitResetTime( void )
+{
+    clock_sec_t		secs;
+	clock_usec_t	microsecs;
+
+    clock_initialize_calendar();
+
+    clock_get_calendar_microtime(&secs, &microsecs);
+    gIOLastWakeTime.tv_sec  = secs;
+    gIOLastWakeTime.tv_usec = microsecs;
+
+    IOService::updateConsoleUsers(NULL, kIOMessageSystemHasPoweredOn);
 }
 
 void iokit_post_constructor_init(void)
@@ -85,7 +91,6 @@
     IORegistryEntry *		root;
     OSObject *			obj;
 
-    IOCPUInitialize();
     root = IORegistryEntry::initialize();
     assert( root );
     IOService::initialize();
@@ -112,6 +117,9 @@
     }
 }
 
+// From <osfmk/kern/debug.c>
+extern int debug_mode;
+
 /*****
  * Pointer into bootstrap KLD segment for functions never used past startup.
  */
@@ -123,19 +131,18 @@
     int				debugFlags;
 
     if( PE_parse_boot_argn( "io", &debugFlags, sizeof (debugFlags) ))
-	gIOKitDebug = debugFlags;
-#if DEVELOPMENT || DEBUG
-    else gIOKitDebug |= kIOWaitQuietPanics;
-#endif /* DEVELOPMENT || DEBUG */
+		gIOKitDebug = debugFlags;
 	
     if( PE_parse_boot_argn( "iotrace", &debugFlags, sizeof (debugFlags) ))
-	gIOKitTrace = debugFlags;
+		gIOKitTrace = debugFlags;
 	
-    // Compat for boot-args
-    gIOKitTrace |= (gIOKitDebug & kIOTraceCompatBootArgs);
+	// Compat for boot-args
+	gIOKitTrace |= (gIOKitDebug & kIOTraceCompatBootArgs);
 	
-    if( PE_parse_boot_argn( "pmtimeout", &debugFlags, sizeof (debugFlags) ))
-        gCanSleepTimeout = debugFlags;
+    // Check for the log synchronous bit set in io
+    if (gIOKitDebug & kIOLogSynchronous)
+        debug_mode = true;
+
     //
     // Have to start IOKit environment before we attempt to start
     // the C++ runtime environment.  At some stage we have to clean up
@@ -145,12 +152,6 @@
     //
     IOLibInit(); 
     OSlibkernInit();
-    devsw_init();
-
-    gIOProgressBackbufferKey  = OSSymbol::withCStringNoCopy(kIOProgressBackbufferKey);
-    gIORemoveOnReadProperties = OSSet::withObjects((const OSObject **) &gIOProgressBackbufferKey, 1);
-
-    interruptAccountingInit();
 
     rootNub = new IOPlatformExpertDevice;
 
@@ -193,17 +194,4 @@
     return;
 }
 
-void
-IORecordProgressBackbuffer(void * buffer, size_t size, uint32_t theme)
-{
-    IORegistryEntry * chosen;
-    if ((chosen = IORegistryEntry::fromPath(kIODeviceTreePlane ":/chosen")))
-    {
-        chosen->setProperty(kIOProgressBackbufferKey, buffer, size);
-	chosen->setProperty(kIOProgressColorThemeKey, theme, 32);
-
-        chosen->release();
-    }
-}
-
 }; /* extern "C" */