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;*************************************************************************
;*************************************************************************
;** **
;** (C)Copyright 1985-2012, American Megatrends, Inc. **
;** **
;** All Rights Reserved. **
;** **
;** 5555 Oakbrook Parkway, Suite 200, Norcross, GA 30093 **
;** **
;** Phone: (770)-246-8600 **
;** **
;*************************************************************************
;*************************************************************************
;*************************************************************************
; $Header: /Alaska/SOURCE/Core/Modules/IA32Core/IA32AsmLib/EnableLongMode.asm 2 8/06/12 2:43p Markw $
;
; $Revision: 2 $
;
; $Date: 8/06/12 2:43p $Log:$
;
;
;*************************************************************************
;<AMI_FHDR_START>
;
; Name:
;
; Description:
;
;<AMI_FHDR_END>
;*************************************************************************
.686p
.xmm
.model flat
.code
;*************************************************************************
;<AMI_PHDR_START>
;
; Name: EnableLongMode
;
; Description:
; VOID EnableLongMode(IN VOID *PageTable, IN VOID *Function,
; IN VOID *Parameter1, IN VOID *Parameter2) enables long mode then calls the
; provided function with the provided parameters.
;
; Input:
; IN VOID *PageTable
; Pointer to level 4 page map.
;
; IN VOID *Function
; Pointer to function to call.
;
; IN VOID *Parameter1
; Parameter 1 for above function call.
;
; IN VOID *Parameter2
; Parameter 2 for above function call.
;
; Output:
; VOID.
;
; Modified:
;
; Referrals:
;
; Notes:
;
;<AMI_PHDR_END>
;*************************************************************************
EnableLongMode proc C public PageTable:DWORD, Function:DWORD, Parameter1:DWORD, Parameter2:DWORD
mov eax, PageTable
mov cr3, eax ;Set CR3 to first page directory pointer table
mov eax, cr4
or ax, 620h ;Enable PAE and XMM in case it was turned off.
mov cr4, eax
;Enable long mode in msr register. Doesn't actually enter long mode yet.
mov ecx, 0c0000080h
rdmsr
bts eax, 8
wrmsr
;Enable paging
mov eax, cr0
bts eax, 31
mov cr0, eax ;Now in long mode compatiblity.
jmp @f
@@:
;jmp far segment:offset
db 67h, 0eah
dd offset long_mode_64
dw 38h ;SYS_CODE64_SEL
long_mode_64:
;in 64-bit long mode
db 48h
xor eax, eax ;xor rax, rax
db 48h
xor ebx, ebx ;xor rbx, rbx
db 48h
xor ecx, ecx ;xor rcx, rcx
db 48h
xor edx, edx ;xor rdx, rdx
mov ecx, Parameter1
mov edx, Parameter2
mov ebx, Function
mov ax, 30h ;SYS_DATA64_SEL
mov ds, ax
mov es, ax
mov ss, ax
push 37fh
fldcw word ptr [esp] ;Uses rsp. Set FP control word according UEFI
db 48h
add esp, 8 ;add rsp, 8
mov eax, 0fffffff0h
db 48h
and esp, eax ;rsp must be on a 16 byte boundary. C compiler expects that.
call ebx ;call rbx
ret
EnableLongMode endp
END
;*************************************************************************
;*************************************************************************
;** **
;** (C)Copyright 1985-2012, American Megatrends, Inc. **
;** **
;** All Rights Reserved. **
;** **
;** 5555 Oakbrook Parkway, Suite 200, Norcross, GA 30093 **
;** **
;** Phone: (770)-246-8600 **
;** **
;*************************************************************************
;*************************************************************************
|
