From ad8ae98d2fa2f9e2bb1ecd7941fb1b7ccda9fa6f Mon Sep 17 00:00:00 2001 From: Jordan Justen Date: Fri, 31 Oct 2014 20:54:31 +0000 Subject: OvmfPkg LoadLinuxLib: Convert X64/JumpToKernel.asm to NASM The BaseTools/Scripts/ConvertMasmToNasm.py script was used to convert X64/JumpToKernel.asm to X64/JumpToKernel.nasm Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jordan Justen Reviewed-by: Laszlo Ersek git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16288 6f19259b-4bc3-4df7-8a09-765794883524 --- OvmfPkg/Library/LoadLinuxLib/X64/JumpToKernel.nasm | 93 ++++++++++++++++++++++ 1 file changed, 93 insertions(+) create mode 100644 OvmfPkg/Library/LoadLinuxLib/X64/JumpToKernel.nasm (limited to 'OvmfPkg/Library/LoadLinuxLib/X64/JumpToKernel.nasm') diff --git a/OvmfPkg/Library/LoadLinuxLib/X64/JumpToKernel.nasm b/OvmfPkg/Library/LoadLinuxLib/X64/JumpToKernel.nasm new file mode 100644 index 0000000000..128dcef0f6 --- /dev/null +++ b/OvmfPkg/Library/LoadLinuxLib/X64/JumpToKernel.nasm @@ -0,0 +1,93 @@ +;------------------------------------------------------------------------------ +; +; Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.
+; +; 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. +; +;------------------------------------------------------------------------------ + + 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 + -- cgit v1.2.3