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;------------------------------------------------------------------------------
;
; Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
;
; This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License
; which accompanies this distribution. The full text of the license may be found at
; http://opensource.org/licenses/bsd-license.php.
;
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;
;------------------------------------------------------------------------------
.code
;------------------------------------------------------------------------------
; VOID
; EFIAPI
; JumpToKernel (
; VOID *KernelStart, // rcx
; VOID *KernelBootParams // rdx
; );
;------------------------------------------------------------------------------
JumpToKernel PROC
; Set up for executing kernel. BP in %esi, entry point on the stack
; (64-bit when the 'ret' will use it as 32-bit, but we're little-endian)
mov rsi, rdx
push rcx
; Jump into the compatibility mode CS
push 10h
lea rax, @F
push rax
DB 048h, 0cbh ; retfq
@@:
; Now in compatibility mode.
DB 0b8h, 018h, 000h, 000h, 000h ; movl $0x18, %eax
DB 08eh, 0d8h ; movl %eax, %ds
DB 08eh, 0c0h ; movl %eax, %es
DB 08eh, 0e0h ; movl %eax, %fs
DB 08eh, 0e8h ; movl %eax, %gs
DB 08eh, 0d0h ; movl %eax, %ss
; Disable paging
DB 00fh, 020h, 0c0h ; movl %cr0, %eax
DB 00fh, 0bah, 0f8h, 01fh ; btcl $31, %eax
DB 00fh, 022h, 0c0h ; movl %eax, %cr0
; Disable long mode in EFER
DB 0b9h, 080h, 000h, 000h, 0c0h ; movl $0x0c0000080, %ecx
DB 00fh, 032h ; rdmsr
DB 00fh, 0bah, 0f8h, 008h ; btcl $8, %eax
DB 00fh, 030h ; wrmsr
; Disable PAE
DB 00fh, 020h, 0e0h ; movl %cr4, %eax
DB 00fh, 0bah, 0f8h, 005h ; btcl $5, %eax
DB 00fh, 022h, 0e0h ; movl %eax, %cr4
DB 031h, 0edh ; xor %ebp, %ebp
DB 031h, 0ffh ; xor %edi, %edi
DB 031h, 0dbh ; xor %ebx, %ebx
DB 0c3h ; ret
JumpToKernel ENDP
END
|
