12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485 |
- ; @file
- ; Copyright (c) 2006 - 2019 Intel Corporation. All rights reserved. <BR>
- ;
- ; SPDX-License-Identifier: BSD-2-Clause-Patent
- ;
- DEFAULT REL
- SECTION .text
- ;------------------------------------------------------------------------------
- ; VOID
- ; EFIAPI
- ; JumpToKernel (
- ; VOID *KernelStart, // rcx
- ; VOID *KernelBootParams // rdx
- ; );
- ;------------------------------------------------------------------------------
- global ASM_PFX(JumpToKernel)
- ASM_PFX(JumpToKernel):
- ; 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 0x10
- lea rax, [.0]
- push rax
- DB 0x48, 0xcb ; retfq
- .0:
- ; Now in compatibility mode.
- DB 0xb8, 0x18, 0x0, 0x0, 0x0 ; movl $0x18, %eax
- DB 0x8e, 0xd8 ; movl %eax, %ds
- DB 0x8e, 0xc0 ; movl %eax, %es
- DB 0x8e, 0xe0 ; movl %eax, %fs
- DB 0x8e, 0xe8 ; movl %eax, %gs
- DB 0x8e, 0xd0 ; movl %eax, %ss
- ; Disable paging
- DB 0xf, 0x20, 0xc0 ; movl %cr0, %eax
- DB 0xf, 0xba, 0xf8, 0x1f ; btcl $31, %eax
- DB 0xf, 0x22, 0xc0 ; movl %eax, %cr0
- ; Disable long mode in EFER
- DB 0xb9, 0x80, 0x0, 0x0, 0xc0 ; movl $0x0c0000080, %ecx
- DB 0xf, 0x32 ; rdmsr
- DB 0xf, 0xba, 0xf8, 0x8 ; btcl $8, %eax
- DB 0xf, 0x30 ; wrmsr
- ; Disable PAE
- DB 0xf, 0x20, 0xe0 ; movl %cr4, %eax
- DB 0xf, 0xba, 0xf8, 0x5 ; btcl $5, %eax
- DB 0xf, 0x22, 0xe0 ; movl %eax, %cr4
- DB 0x31, 0xed ; xor %ebp, %ebp
- DB 0x31, 0xff ; xor %edi, %edi
- DB 0x31, 0xdb ; xor %ebx, %ebx
- DB 0xc3 ; ret
- ;------------------------------------------------------------------------------
- ; VOID
- ; EFIAPI
- ; JumpToUefiKernel (
- ; EFI_HANDLE ImageHandle, // rcx
- ; EFI_SYSTEM_TABLE *SystemTable, // rdx
- ; VOID *KernelBootParams // r8
- ; VOID *KernelStart, // r9
- ; );
- ;------------------------------------------------------------------------------
- global ASM_PFX(JumpToUefiKernel)
- ASM_PFX(JumpToUefiKernel):
- mov rdi, rcx
- mov rsi, rdx
- mov rdx, r8
- xor rax, rax
- mov eax, [r8 + 0x264]
- add r9, rax
- add r9, 0x200
- call r9
- ret
|