diff options
Diffstat (limited to 'MdePkg/Library/BaseLib/X64/Thunk16.nasm')
| -rw-r--r-- | MdePkg/Library/BaseLib/X64/Thunk16.nasm | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/MdePkg/Library/BaseLib/X64/Thunk16.nasm b/MdePkg/Library/BaseLib/X64/Thunk16.nasm index cfa55d44cb..4678dcc540 100644 --- a/MdePkg/Library/BaseLib/X64/Thunk16.nasm +++ b/MdePkg/Library/BaseLib/X64/Thunk16.nasm @@ -3,7 +3,7 @@ ;------------------------------------------------------------------------------
;
-; Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2006 - 2018, 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
@@ -240,14 +240,14 @@ BITS 64 push rbx
push rsi
push rdi
-
+
mov ebx, ds
push rbx ; Save ds segment register on the stack
mov ebx, es
push rbx ; Save es segment register on the stack
mov ebx, ss
push rbx ; Save ss segment register on the stack
-
+
push fs
push gs
mov rsi, rcx
@@ -266,15 +266,15 @@ BITS 64 shl eax, 12 ; segment address in high order 16 bits
lea ax, [rdx + (_BackFromUserCode - ASM_PFX(m16Start))] ; offset address
stosd ; [edi] <- return address of user code
-
+
sgdt [rsp + 60h] ; save GDT stack in argument space
- movzx r10, word [rsp + 60h] ; r10 <- GDT limit
+ movzx r10, word [rsp + 60h] ; r10 <- GDT limit
lea r11, [rcx + (ASM_PFX(InternalAsmThunk16) - _BackFromUserCode.SavedCr4End) + 0xf]
and r11, ~0xf ; r11 <- 16-byte aligned shadowed GDT table in real mode buffer
-
+
mov [rcx + (SavedGdt - _BackFromUserCode.SavedCr4End)], r10w ; save the limit of shadowed GDT table
mov [rcx + (SavedGdt - _BackFromUserCode.SavedCr4End) + 2], r11 ; save the base address of shadowed GDT table
-
+
mov rsi, [rsp + 62h] ; rsi <- the original GDT base address
xchg rcx, r10 ; save rcx to r10 and initialize rcx to be the limit of GDT table
inc rcx ; rcx <- the size of memory to copy
@@ -282,7 +282,7 @@ BITS 64 rep movsb ; perform memory copy to shadow GDT table
mov rcx, r10 ; restore the orignal rcx before memory copy
mov rdi, r11 ; restore the original rdi before memory copy
-
+
sidt [rsp + 50h] ; save IDT stack in argument space
mov rax, cr0
mov [rcx + (_BackFromUserCode.SavedCr0End - 4 - _BackFromUserCode.SavedCr4End)], eax
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