diff options
Diffstat (limited to 'Core/CPU/IA32/IA32AsmLib/EnableLongMode.asm')
| -rw-r--r-- | Core/CPU/IA32/IA32AsmLib/EnableLongMode.asm | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/Core/CPU/IA32/IA32AsmLib/EnableLongMode.asm b/Core/CPU/IA32/IA32AsmLib/EnableLongMode.asm new file mode 100644 index 0000000..14af3dd --- /dev/null +++ b/Core/CPU/IA32/IA32AsmLib/EnableLongMode.asm @@ -0,0 +1,143 @@ +;************************************************************************* +;************************************************************************* +;** ** +;** (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 ** +;** ** +;************************************************************************* +;************************************************************************* |