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.system
        PUSH    SYS_FIXED_AREA + CSysFixedArea.boot_cpu
        PUSH    0
        CALL    &CPUStructInit
        CALL    SET_GS_BASE

//Init System HeapCtrl
        MOV     EDI, U32 SYS_FIXED_AREA + CSysFixedArea.system_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.system
        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_SYSTEM_HEAP_CTRL

        PUSH    MEM_SYSTEM_STACK
        PUSH    U32 SYS_FIXED_AREA + CSysFixedArea.system
        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.  SYS_RAM_REBOOT
        PUSH    U32 CGDT.ds         //stack seg
        PUSH    U32 [SYS_BOOT_STACK]//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
}