mirror of https://github.com/acidanthera/audk.git
IntelFsp2WrapperPkg BaseFspWrapperApiLib: Convert X64/Thunk64To32.asm to NASM
Manually convert X64/Thunk64To32.asm to X64/Thunk64To32.nasm Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Liming Gao <liming.gao@intel.com>
This commit is contained in:
Liming Gao
parent
b295fbba8d
commit
24498828f7
|
|
@ -47,6 +47,7 @@
|
||||||
X64/DispatchExecute.c
|
X64/DispatchExecute.c
|
||||||
X64/Thunk64To32.asm
|
X64/Thunk64To32.asm
|
||||||
X64/Thunk64To32.S
|
X64/Thunk64To32.S
|
||||||
|
X64/Thunk64To32.nasm
|
||||||
|
|
||||||
################################################################################
|
################################################################################
|
||||||
#
|
#
|
||||||
|
|
|
||||||
|
|
@ -0,0 +1,230 @@
|
||||||
|
;
|
||||||
|
; Copyright (c) 2016, 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.
|
||||||
|
;
|
||||||
|
;
|
||||||
|
; Module Name:
|
||||||
|
;
|
||||||
|
; Thunk64To32.nasm
|
||||||
|
;
|
||||||
|
; Abstract:
|
||||||
|
;
|
||||||
|
; This is the assembly code to transition from long mode to compatibility mode to execute 32-bit code and then
|
||||||
|
; transit back to long mode.
|
||||||
|
;
|
||||||
|
;-------------------------------------------------------------------------------
|
||||||
|
DEFAULT REL
|
||||||
|
SECTION .text
|
||||||
|
;----------------------------------------------------------------------------
|
||||||
|
; Procedure: AsmExecute32BitCode
|
||||||
|
;
|
||||||
|
; Input: None
|
||||||
|
;
|
||||||
|
; Output: None
|
||||||
|
;
|
||||||
|
; Prototype: UINT32
|
||||||
|
; AsmExecute32BitCode (
|
||||||
|
; IN UINT64 Function,
|
||||||
|
; IN UINT64 Param1,
|
||||||
|
; IN UINT64 Param2,
|
||||||
|
; IN IA32_DESCRIPTOR *InternalGdtr
|
||||||
|
; );
|
||||||
|
;
|
||||||
|
;
|
||||||
|
; Description: A thunk function to execute 32-bit code in long mode.
|
||||||
|
;
|
||||||
|
;----------------------------------------------------------------------------
|
||||||
|
global ASM_PFX(AsmExecute32BitCode)
|
||||||
|
ASM_PFX(AsmExecute32BitCode):
|
||||||
|
;
|
||||||
|
; save IFLAG and disable it
|
||||||
|
;
|
||||||
|
pushfq
|
||||||
|
cli
|
||||||
|
|
||||||
|
;
|
||||||
|
; save orignal GDTR and CS
|
||||||
|
;
|
||||||
|
mov rax, ds
|
||||||
|
push rax
|
||||||
|
mov rax, cs
|
||||||
|
push rax
|
||||||
|
sub rsp, 0x10
|
||||||
|
sgdt [rsp]
|
||||||
|
;
|
||||||
|
; load internal GDT
|
||||||
|
;
|
||||||
|
lgdt [r9]
|
||||||
|
;
|
||||||
|
; Save general purpose register and rflag register
|
||||||
|
;
|
||||||
|
pushfq
|
||||||
|
push rdi
|
||||||
|
push rsi
|
||||||
|
push rbp
|
||||||
|
push rbx
|
||||||
|
|
||||||
|
;
|
||||||
|
; save CR3
|
||||||
|
;
|
||||||
|
mov rax, cr3
|
||||||
|
mov rbp, rax
|
||||||
|
|
||||||
|
;
|
||||||
|
; Prepare the CS and return address for the transition from 32-bit to 64-bit mode
|
||||||
|
;
|
||||||
|
mov rax, dword 0x10 ; load long mode selector
|
||||||
|
shl rax, 32
|
||||||
|
mov r9, ReloadCS ;Assume the ReloadCS is under 4G
|
||||||
|
or rax, r9
|
||||||
|
push rax
|
||||||
|
;
|
||||||
|
; Save parameters for 32-bit function call
|
||||||
|
;
|
||||||
|
mov rax, r8
|
||||||
|
shl rax, 32
|
||||||
|
or rax, rdx
|
||||||
|
push rax
|
||||||
|
;
|
||||||
|
; save the 32-bit function entry and the return address into stack which will be
|
||||||
|
; retrieve in compatibility mode.
|
||||||
|
;
|
||||||
|
mov rax, ReturnBack ;Assume the ReloadCS is under 4G
|
||||||
|
shl rax, 32
|
||||||
|
or rax, rcx
|
||||||
|
push rax
|
||||||
|
|
||||||
|
;
|
||||||
|
; let rax save DS
|
||||||
|
;
|
||||||
|
mov rax, dword 0x18
|
||||||
|
|
||||||
|
;
|
||||||
|
; Change to Compatible Segment
|
||||||
|
;
|
||||||
|
mov rcx, dword 0x8 ; load compatible mode selector
|
||||||
|
shl rcx, 32
|
||||||
|
mov rdx, Compatible ; assume address < 4G
|
||||||
|
or rcx, rdx
|
||||||
|
push rcx
|
||||||
|
retf
|
||||||
|
|
||||||
|
Compatible:
|
||||||
|
; reload DS/ES/SS to make sure they are correct referred to current GDT
|
||||||
|
mov ds, ax
|
||||||
|
mov es, ax
|
||||||
|
mov ss, ax
|
||||||
|
|
||||||
|
;
|
||||||
|
; Disable paging
|
||||||
|
;
|
||||||
|
mov rcx, cr0
|
||||||
|
btc ecx, 31
|
||||||
|
mov cr0, rcx
|
||||||
|
;
|
||||||
|
; Clear EFER.LME
|
||||||
|
;
|
||||||
|
mov ecx, 0xC0000080
|
||||||
|
rdmsr
|
||||||
|
btc eax, 8
|
||||||
|
wrmsr
|
||||||
|
|
||||||
|
; Now we are in protected mode
|
||||||
|
;
|
||||||
|
; Call 32-bit function. Assume the function entry address and parameter value is less than 4G
|
||||||
|
;
|
||||||
|
pop rax ; Here is the function entry
|
||||||
|
;
|
||||||
|
; Now the parameter is at the bottom of the stack, then call in to IA32 function.
|
||||||
|
;
|
||||||
|
jmp rax
|
||||||
|
ReturnBack:
|
||||||
|
mov ebx, eax ; save return status
|
||||||
|
pop rcx ; drop param1
|
||||||
|
pop rcx ; drop param2
|
||||||
|
|
||||||
|
;
|
||||||
|
; restore CR4
|
||||||
|
;
|
||||||
|
mov rax, cr4
|
||||||
|
bts eax, 5
|
||||||
|
mov cr4, rax
|
||||||
|
|
||||||
|
;
|
||||||
|
; restore CR3
|
||||||
|
;
|
||||||
|
mov eax, ebp
|
||||||
|
mov cr3, rax
|
||||||
|
|
||||||
|
;
|
||||||
|
; Set EFER.LME to re-enable ia32-e
|
||||||
|
;
|
||||||
|
mov ecx, 0xC0000080
|
||||||
|
rdmsr
|
||||||
|
bts eax, 8
|
||||||
|
wrmsr
|
||||||
|
;
|
||||||
|
; Enable paging
|
||||||
|
;
|
||||||
|
mov rax, cr0
|
||||||
|
bts eax, 31
|
||||||
|
mov cr0, rax
|
||||||
|
; Now we are in compatible mode
|
||||||
|
|
||||||
|
;
|
||||||
|
; Reload cs register
|
||||||
|
;
|
||||||
|
retf
|
||||||
|
ReloadCS:
|
||||||
|
;
|
||||||
|
; Now we're in Long Mode
|
||||||
|
;
|
||||||
|
;
|
||||||
|
; Restore C register and eax hold the return status from 32-bit function.
|
||||||
|
; Note: Do not touch rax from now which hold the return value from IA32 function
|
||||||
|
;
|
||||||
|
mov eax, ebx ; put return status to EAX
|
||||||
|
pop rbx
|
||||||
|
pop rbp
|
||||||
|
pop rsi
|
||||||
|
pop rdi
|
||||||
|
popfq
|
||||||
|
;
|
||||||
|
; Switch to orignal GDT and CS. here rsp is pointer to the orignal GDT descriptor.
|
||||||
|
;
|
||||||
|
lgdt [rsp]
|
||||||
|
;
|
||||||
|
; drop GDT descriptor in stack
|
||||||
|
;
|
||||||
|
add rsp, 0x10
|
||||||
|
;
|
||||||
|
; switch to orignal CS and GDTR
|
||||||
|
;
|
||||||
|
pop r9 ; get CS
|
||||||
|
shl r9, 32 ; rcx[32..47] <- Cs
|
||||||
|
mov rcx, .0
|
||||||
|
or rcx, r9
|
||||||
|
push rcx
|
||||||
|
retf
|
||||||
|
.0:
|
||||||
|
;
|
||||||
|
; Reload original DS/ES/SS
|
||||||
|
;
|
||||||
|
pop rcx
|
||||||
|
mov ds, rcx
|
||||||
|
mov es, rcx
|
||||||
|
mov ss, rcx
|
||||||
|
|
||||||
|
;
|
||||||
|
; Restore IFLAG
|
||||||
|
;
|
||||||
|
popfq
|
||||||
|
|
||||||
|
ret
|
||||||
|
|
||||||
Loading…
Reference in New Issue