diff options
Diffstat (limited to 'MdePkg/Library/BaseLib/X64/Thunk16.asm')
| -rw-r--r-- | MdePkg/Library/BaseLib/X64/Thunk16.asm | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/MdePkg/Library/BaseLib/X64/Thunk16.asm b/MdePkg/Library/BaseLib/X64/Thunk16.asm index b120434efb..2c35c72a57 100644 --- a/MdePkg/Library/BaseLib/X64/Thunk16.asm +++ b/MdePkg/Library/BaseLib/X64/Thunk16.asm @@ -61,6 +61,10 @@ SavedGdt LABEL FWORD DW ?
DQ ?
+;------------------------------------------------------------------------------
+; _BackFromUserCode() takes control in real mode after 'retf' has been executed
+; by user code. It will be shadowed to somewhere in memory below 1MB.
+;------------------------------------------------------------------------------
_BackFromUserCode PROC
DB 16h ; push ss
DB 0eh ; push cs
@@ -125,6 +129,10 @@ _16Gdtr LABEL FWORD _16GdtrBase DQ _NullSegDesc
_16Idtr FWORD (1 SHL 10) - 1
+;------------------------------------------------------------------------------
+; _ToUserCode() takes control in real mode before passing control to user code.
+; It will be shadowed to somewhere in memory below 1MB.
+;------------------------------------------------------------------------------
_ToUserCode PROC
mov edi, ss
mov ss, edx ; set new segment selectors
@@ -184,11 +192,14 @@ _16DsDesc LABEL QWORD DB 0
GdtEnd LABEL QWORD
-;
-; @param RegSet Pointer to a IA32_DWORD_REGS structure
-; @param Transition Pointer to the transition code
-; @return The address of the 16-bit stack after returning from user code
-;
+;------------------------------------------------------------------------------
+; IA32_REGISTER_SET *
+; EFIAPI
+; InternalAsmThunk16 (
+; IN IA32_REGISTER_SET *RegisterSet,
+; IN OUT VOID *Transition
+; );
+;------------------------------------------------------------------------------
InternalAsmThunk16 PROC USES rbp rbx rsi rdi
mov r10d, ds
mov r11d, es
|