[mirror_edk2.git] / MdePkg / Library / BaseLib / X64 / DisablePaging64.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
;   DisablePaging64.Asm\r
;\r
; Abstract:\r
;\r
;   AsmDisablePaging64 function\r
;\r
; Notes:\r
;\r
;------------------------------------------------------------------------------\r
\r
    .code\r
\r
;------------------------------------------------------------------------------\r
; VOID\r
; EFIAPI\r
; InternalX86DisablePaging64 (\r
;   IN      UINT16                    Cs,\r
;   IN      UINT32                    EntryPoint,\r
;   IN      UINT32                    Context1,  OPTIONAL\r
;   IN      UINT32                    Context2,  OPTIONAL\r
;   IN      UINT32                    NewStack\r
;   );\r
;------------------------------------------------------------------------------\r
InternalX86DisablePaging64    PROC\r
    cli\r
    shl     rcx, 32\r
    lea     eax, @F\r
    mov     ecx, eax\r
    push    rcx\r
    mov     ebx, edx\r
    mov     esi, r8d\r
    mov     edi, r9d\r
    mov     eax, [rsp + 28h]\r
    retf\r
@@:\r
    mov     esp, eax                    ; set up new stack\r
    mov     rax, cr0\r
    btr     eax, 31\r
    mov     cr0, rax                    ; disable paging\r
    mov     ecx, 0c0000080h\r
    rdmsr\r
    and     ah, NOT 1                   ; clear LME\r
    wrmsr\r
    mov     rax, cr4\r
    and     al, NOT (1 SHL 5)           ; clear PAE\r
    mov     cr4, rax\r
    push    rdi\r
    push    rsi\r
    call    rbx\r
    jmp     $\r
InternalX86DisablePaging64    ENDP\r
\r
    END\r
Commit	Line	Data
878ddf1f	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	; DisablePaging64.Asm\r
	15	;\r
	16	; Abstract:\r
	17	;\r
	18	; AsmDisablePaging64 function\r
	19	;\r
	20	; Notes:\r
	21	;\r
	22	;------------------------------------------------------------------------------\r
	23	\r
	24	.code\r
	25	\r
3f566587	26	;------------------------------------------------------------------------------\r
	27	; VOID\r
	28	; EFIAPI\r
	29	; InternalX86DisablePaging64 (\r
	30	; IN UINT16 Cs,\r
	31	; IN UINT32 EntryPoint,\r
	32	; IN UINT32 Context1, OPTIONAL\r
	33	; IN UINT32 Context2, OPTIONAL\r
	34	; IN UINT32 NewStack\r
	35	; );\r
	36	;------------------------------------------------------------------------------\r
878ddf1f	37	InternalX86DisablePaging64 PROC\r
	38	cli\r
	39	shl rcx, 32\r
d9da5f59	40	lea eax, @F\r
d9da5f59	41	mov ecx, eax\r
878ddf1f	42	push rcx\r
	43	mov ebx, edx\r
	44	mov esi, r8d\r
	45	mov edi, r9d\r
	46	mov eax, [rsp + 28h]\r
	47	retf\r
	48	@@:\r
	49	mov esp, eax ; set up new stack\r
	50	mov rax, cr0\r
	51	btr eax, 31\r
	52	mov cr0, rax ; disable paging\r
	53	mov ecx, 0c0000080h\r
	54	rdmsr\r
	55	and ah, NOT 1 ; clear LME\r
	56	wrmsr\r
	57	mov rax, cr4\r
	58	and al, NOT (1 SHL 5) ; clear PAE\r
	59	mov cr4, rax\r
	60	push rdi\r
	61	push rsi\r
	62	call rbx\r
	63	jmp $\r
	64	InternalX86DisablePaging64 ENDP\r
	65	\r
	66	END\r