Integrate systime module to build

xtoskrnl/CMakeLists.txt

@@ -53,6 +53,7 @@ list(APPEND XTOSKRNL_SOURCE
     ${XTOSKRNL_SOURCE_DIR}/ke/shdata.cc
     ${XTOSKRNL_SOURCE_DIR}/ke/spinlock.cc
     ${XTOSKRNL_SOURCE_DIR}/ke/sysres.cc
+    ${XTOSKRNL_SOURCE_DIR}/ke/systime.cc
     ${XTOSKRNL_SOURCE_DIR}/ke/timer.cc
     ${XTOSKRNL_SOURCE_DIR}/mm/${ARCH}/mmgr.cc
     ${XTOSKRNL_SOURCE_DIR}/mm/${ARCH}/pagemap.cc

xtoskrnl/ke/data.cc

@@ -74,3 +74,6 @@ LIST_ENTRY KE::SystemResources::ResourcesListHead;
 
 /* Kernel boot resources lock */
 KSPIN_LOCK KE::SystemResources::ResourcesLock;
+
+/* Kernel boot time */
+LARGE_INTEGER KE::SystemTime::BootTime;