mirror of https://github.com/acidanthera/audk.git
96 lines
3.2 KiB
NASM
96 lines
3.2 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
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;
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; This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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; http://opensource.org/licenses/bsd-license.php.
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;
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; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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;------------------------------------------------------------------------------
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.code
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;------------------------------------------------------------------------------
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; VOID
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; EFIAPI
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; JumpToKernel (
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; VOID *KernelStart, // rcx
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; VOID *KernelBootParams // rdx
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; );
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;------------------------------------------------------------------------------
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JumpToKernel PROC
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; Set up for executing kernel. BP in %esi, entry point on the stack
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; (64-bit when the 'ret' will use it as 32-bit, but we're little-endian)
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mov rsi, rdx
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push rcx
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; Jump into the compatibility mode CS
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push 10h
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lea rax, @F
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push rax
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DB 048h, 0cbh ; retfq
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@@:
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; Now in compatibility mode.
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DB 0b8h, 018h, 000h, 000h, 000h ; movl $0x18, %eax
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DB 08eh, 0d8h ; movl %eax, %ds
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DB 08eh, 0c0h ; movl %eax, %es
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DB 08eh, 0e0h ; movl %eax, %fs
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DB 08eh, 0e8h ; movl %eax, %gs
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DB 08eh, 0d0h ; movl %eax, %ss
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; Disable paging
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DB 00fh, 020h, 0c0h ; movl %cr0, %eax
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DB 00fh, 0bah, 0f8h, 01fh ; btcl $31, %eax
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DB 00fh, 022h, 0c0h ; movl %eax, %cr0
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; Disable long mode in EFER
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DB 0b9h, 080h, 000h, 000h, 0c0h ; movl $0x0c0000080, %ecx
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DB 00fh, 032h ; rdmsr
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DB 00fh, 0bah, 0f8h, 008h ; btcl $8, %eax
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DB 00fh, 030h ; wrmsr
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; Disable PAE
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DB 00fh, 020h, 0e0h ; movl %cr4, %eax
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DB 00fh, 0bah, 0f8h, 005h ; btcl $5, %eax
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DB 00fh, 022h, 0e0h ; movl %eax, %cr4
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DB 031h, 0edh ; xor %ebp, %ebp
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DB 031h, 0ffh ; xor %edi, %edi
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DB 031h, 0dbh ; xor %ebx, %ebx
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DB 0c3h ; ret
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JumpToKernel ENDP
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;------------------------------------------------------------------------------
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; VOID
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; EFIAPI
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; JumpToUefiKernel (
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; EFI_HANDLE ImageHandle, // rcx
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; EFI_SYSTEM_TABLE *SystemTable, // rdx
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; VOID *KernelBootParams // r8
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; VOID *KernelStart, // r9
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; );
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;------------------------------------------------------------------------------
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JumpToUefiKernel PROC
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mov rdi, rcx
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mov rsi, rdx
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mov rdx, r8
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xor rax, rax
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mov eax, [r8 + 264h]
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add r9, rax
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add r9, 200h
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call r9
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ret
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JumpToUefiKernel ENDP
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END
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