[mirror_edk2.git] / MdePkg / Library / BaseLib / X64 / EnablePaging64.asm

;------------------------------------------------------------------------------\r
;\r
; Copyright (c) 2006, Intel Corporation\r
; All rights reserved. This program and the accompanying materials\r
; are licensed and made available under the terms and conditions of the BSD License\r
; which accompanies this distribution.  The full text of the license may be found at\r
; http://opensource.org/licenses/bsd-license.php\r
;\r
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
;\r
; Module Name:\r
;\r
;   EnablePaging64.Asm\r
;\r
; Abstract:\r
;\r
;   AsmEnablePaging64 function\r
;\r
; Notes:\r
;\r
;------------------------------------------------------------------------------\r
\r
    .code\r
\r
;------------------------------------------------------------------------------\r
; VOID\r
; EFIAPI\r
; InternalX86EnablePaging64 (\r
;   IN      UINT16                    Cs,\r
;   IN      UINT64                    EntryPoint,\r
;   IN      UINT64                    Context1,  OPTIONAL\r
;   IN      UINT64                    Context2,  OPTIONAL\r
;   IN      UINT64                    NewStack\r
;   );\r
;------------------------------------------------------------------------------\r
InternalX86EnablePaging64 PROC\r
    cli\r
    pop     rax                         ; skip the return address\r
    call    @Base\r
@Base:\r
    add     dword ptr [rsp], @F - @Base ; offset for far retf, seg is the 1st arg\r
    mov     rax, cr4                    ; mov eax, cr4\r
    or      al, (1 SHL 5)\r
    mov     cr4, rax                    ; enable PAE\r
    mov     ecx, 0c0000080h\r
    rdmsr\r
    or      ah, 1                       ; set LME\r
    wrmsr\r
    mov     rax, cr0                    ; mov eax, cr0\r
    bts     eax, 31\r
    mov     cr0, rax                    ; enable paging\r
    retf\r
@@:                                     ; long mode starts here\r
    mov     rbx, [esp]\r
    mov     rcx, [esp + 8]\r
    mov     rdx, [esp + 10h]\r
    mov     rsp, [esp + 18h]\r
    add     rsp, -20h\r
    call    rbx\r
    hlt                                 ; halt processor if EntryPoint() returned\r
InternalX86EnablePaging64 ENDP\r
\r
    END\r
Commit	Line	Data
ebca8169	1	;------------------------------------------------------------------------------\r
	2	;\r
	3	; Copyright (c) 2006, Intel Corporation\r
	4	; All rights reserved. This program and the accompanying materials\r
	5	; are licensed and made available under the terms and conditions of the BSD License\r
	6	; which accompanies this distribution. The full text of the license may be found at\r
	7	; http://opensource.org/licenses/bsd-license.php\r
	8	;\r
	9	; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	10	; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	11	;\r
	12	; Module Name:\r
	13	;\r
	14	; EnablePaging64.Asm\r
	15	;\r
	16	; Abstract:\r
	17	;\r
	18	; AsmEnablePaging64 function\r
	19	;\r
	20	; Notes:\r
	21	;\r
	22	;------------------------------------------------------------------------------\r
	23	\r
	24	.code\r
	25	\r
	26	;------------------------------------------------------------------------------\r
	27	; VOID\r
	28	; EFIAPI\r
	29	; InternalX86EnablePaging64 (\r
	30	; IN UINT16 Cs,\r
	31	; IN UINT64 EntryPoint,\r
	32	; IN UINT64 Context1, OPTIONAL\r
	33	; IN UINT64 Context2, OPTIONAL\r
	34	; IN UINT64 NewStack\r
	35	; );\r
	36	;------------------------------------------------------------------------------\r
	37	InternalX86EnablePaging64 PROC\r
	38	cli\r
a9a812a0	39	pop rax ; skip the return address\r
4a78c00a	40	call @Base\r
	41	@Base:\r
	42	add dword ptr [rsp], @F - @Base ; offset for far retf, seg is the 1st arg\r
ebca8169	43	mov rax, cr4 ; mov eax, cr4\r
	44	or al, (1 SHL 5)\r
	45	mov cr4, rax ; enable PAE\r
	46	mov ecx, 0c0000080h\r
	47	rdmsr\r
	48	or ah, 1 ; set LME\r
	49	wrmsr\r
	50	mov rax, cr0 ; mov eax, cr0\r
	51	bts eax, 31\r
	52	mov cr0, rax ; enable paging\r
	53	retf\r
	54	@@: ; long mode starts here\r
	55	mov rbx, [esp]\r
	56	mov rcx, [esp + 8]\r
	57	mov rdx, [esp + 10h]\r
	58	mov rsp, [esp + 18h]\r
	59	add rsp, -20h\r
	60	call rbx\r
a9a812a0	61	hlt ; halt processor if EntryPoint() returned\r
ebca8169	62	InternalX86EnablePaging64 ENDP\r
	63	\r
	64	END\r