asm {
USE64
				BTS 		U32 [SYS_RUN_LEVEL],RLf_64BIT

//Set required bits for SSE instruction execution
				MOV_RAX_CR4
				BTS 		RAX,CR4f_OSFXSR
				MOV_CR4_RAX

				MOV_EAX_CR0
				BTR 		RAX,CR0f_EM
				BTR 		RAX,CR0f_MP
				BTS 		RAX,CR0f_NE
				MOV_CR0_EAX
				FNINIT
				MOV 		RAX,SYS_FIXED_AREA+CSysFixedArea.init_fpu_mmx
				FXSAVE	U64 [RAX]

//Init CPU0 Struct
				PUSH		SYS_FIXED_AREA+CSysFixedArea.zenith
				PUSH		SYS_FIXED_AREA+CSysFixedArea.boot_cpu
				PUSH		0
				CALL		&CPUStructInit
				CALL		SET_GS_BASE

//Init Zenith HeapCtrl
				MOV 		EDI,U32 SYS_FIXED_AREA+CSysFixedArea.zenith_hc
				MOV 		EAX,U32 SYS_FIXED_AREA+CSysFixedArea.sys_code_bp
				MOV 		U64 CHeapCtrl.bp[RDI],RAX
				MOV 		U32 CHeapCtrl.hc_signature[RDI],HEAP_CTRL_SIGNATURE_VAL
 
				LEA 		RAX,U64 CHeapCtrl.next_um-CMemUsed.next[RDI]
				MOV 		U64 CHeapCtrl.next_um[RDI],RAX
				MOV 		U64 CHeapCtrl.last_um[RDI],RAX

				MOV 		EAX,U32 SYS_FIXED_AREA+CSysFixedArea.zenith
				MOV 		U64 CHeapCtrl.mem_task[RDI],RAX
				MOV 		U64 CTask.code_heap[RAX],RDI
				MOV 		U64 CTask.data_heap[RAX],RDI
				MOV 		U32 CTask.task_signature[RAX],TASK_SIGNATURE_VAL
 
				BTS 		U32 [SYS_RUN_LEVEL],RLf_16MEG_ZENITH_HEAP_CTRL

				PUSH		MEM_ZENITH_STACK
				PUSH		U32 SYS_FIXED_AREA+CSysFixedArea.zenith
				CALL		&TaskInit
				CALL		SET_FS_BASE
				MOV 		RSP,U64 CTask.rsp[RAX]

				JMP 		I32 &KMain

//************************************
USE32
SYS_ENTER_LONG_MODE:: //Switch to long 64-bit mode
				MOV_EAX_CR4
				OR			EAX, CR4F_PAE | CR4F_PGE
				MOV_CR4_EAX

				MOV 		EAX,[MEM_PML4]
				MOV_CR3_EAX

				MOV 		ECX,IA32_EFER
				XOR 		EDX,EDX
				MOV 		EAX,IA32F_LME
				WRMSR

				MOV_EAX_CR0
				BTS 		EAX,31	//Enable paging (required for 64-bit mode)
				MOV_CR0_EAX

				DU8 		0xEA; 		 //JMP CGDT.cs64:@@05
				DU32		@@05;
				DU16		CGDT.cs64;
USE64
@@05: 	MOV 		AX,CGDT.ds
				MOV 		DS,AX
				MOV 		ES,AX
				MOV 		SS,AX
				MOV 		FS,AX
				MOV 		GS,AX
				RET

//************************************
SYS_RAM_REBOOT:: //This gets copied high.  $LK,"SYS_RAM_REBOOT",A="FF:::/Zenith/Boot/BootRAM.CC,SYS_RAM_REBOOT:2"$
				PUSH		U32 CGDT.ds 						//stack seg
				PUSH		U32 BOOT_RAM_LIMIT			//stack
				PUSH		U32 0 									//flags
				PUSH		U32 CGDT.cs32
				LEA 		RAX,[@@10]
				PUSH		RAX
				IRET
USE32
@@10: 	WBINVD

//Disable paging
				MOV_EAX_CR0
				BTR 		EAX,31
				MOV_CR0_EAX

				MOV 		ECX,IA32_EFER
				XOR 		EDX,EDX
				XOR 		EAX,EAX
				WRMSR

				MOV 		EBX,BOOT_SRC_RAM
				MOV 		EAX,I32 CORE0_32BIT_INIT
				JMP 		EAX
SYS_RAM_REBOOT_END::
USE64
}