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[NTOS]: Switch to a slightly (perhaps, hopefully?) safer version of V86 entry/exit to see if this fixes the buildbot boot (suffice it to say, the original code works fine on my test machine, but since half the developers seem to be using GCC 4.4 and the others GCC 4.1, I wouldn't be surprised if there's compiler subtleties involved).

Browse source 
svn path=/trunk/; revision=45046
This commit is contained in:
Sir Richard 2010-01-11 18:26:46 +00:00
parent f81a3c4918
commit 0feb759f62
4 changed files with 26 additions and 10 deletions
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7
reactos/ntoskrnl/include/internal/i386/ke.h
View file

@ -411,6 +411,12 @@ KiEoiHelper(
VOID
FASTCALL
Ki386BiosCallReturnAddress(
IN PKTRAP_FRAME TrapFrame
);
ULONG_PTR
FASTCALL
KiExitV86Mode(
IN PKTRAP_FRAME TrapFrame
);
@ -442,7 +448,6 @@ extern VOID NTAPI ExpInterlockedPopEntrySListFault(VOID);
extern VOID __cdecl CopyParams(VOID);
extern VOID __cdecl ReadBatch(VOID);
extern VOID __cdecl FrRestore(VOID);
extern VOID Ki386BiosCallReturnAddress(VOID);
PFX_SAVE_AREA
FORCEINLINE

15
reactos/ntoskrnl/ke/i386/ctxswitch.S
View file

@ -871,6 +871,19 @@ _Ki386SetupAndExitToV86Mode@4:
/* Enter V8086 mode */
pushad
call @KiEnterV86Mode@0
sub esp, (12 + KTRAP_FRAME_LENGTH + NPX_FRAME_LENGTH)
mov ecx, esp
call @KiEnterV86Mode@4
jmp $
.endfunc
.globl @Ki386BiosCallReturnAddress@4
@Ki386BiosCallReturnAddress@4:
/* Exit V8086 mode */
call @KiExitV86Mode@4
mov esp, eax
add esp, (12 + KTRAP_FRAME_LENGTH + NPX_FRAME_LENGTH)
popad
ret

4
reactos/ntoskrnl/ke/i386/traphdlr.c
View file

@ -1255,11 +1255,11 @@ KiTrap13Handler(IN PKTRAP_FRAME TrapFrame)
* Why? Because part of the trap frame actually corresponds to the IRET
* stack during the trap exit!
*/
if ((TrapFrame->HardwareEsp == (ULONG)KiExitV86Mode) &&
if ((TrapFrame->HardwareEsp == (ULONG)Ki386BiosCallReturnAddress) &&
(TrapFrame->HardwareSegSs == (KGDT_R0_CODE | RPL_MASK)))
{
/* Exit the V86 trap! */
KiExitV86Mode(TrapFrame);
Ki386BiosCallReturnAddress(TrapFrame);
}
else
{

10
reactos/ntoskrnl/ke/i386/v86vdm.c
View file

@ -429,7 +429,7 @@ Ki386HandleOpcodeV86(IN PKTRAP_FRAME TrapFrame)
return KiVdmHandleOpcode(TrapFrame, 1);
}
VOID
ULONG_PTR
FASTCALL
KiExitV86Mode(IN PKTRAP_FRAME TrapFrame)
{
@ -468,17 +468,15 @@ KiExitV86Mode(IN PKTRAP_FRAME TrapFrame)
/* Enable interrupts and get back to protected mode */
_enable();
KiV86TrapReturn(TrapFrame->Edi);
return TrapFrame->Edi;
}
VOID
FASTCALL
KiEnterV86Mode(VOID)
KiEnterV86Mode(IN PKV8086_STACK_FRAME StackFrame)
{
PKTHREAD Thread;
PKGDTENTRY GdtEntry;
KV8086_STACK_FRAME StackFrameBuffer;
PKV8086_STACK_FRAME StackFrame = &StackFrameBuffer;
PKTRAP_FRAME TrapFrame = &StackFrame->TrapFrame;
PKV86_FRAME V86Frame = &StackFrame->V86Frame;
PFX_SAVE_AREA NpxFrame = &StackFrame->NpxArea;
@ -497,7 +495,7 @@ KiEnterV86Mode(VOID)
V86Frame->PcrTeb = KeGetPcr()->Tib.Self;
/* Save return EIP */
TrapFrame->Eip = (ULONG_PTR)KiExitV86Mode;
TrapFrame->Eip = (ULONG_PTR)Ki386BiosCallReturnAddress;
/* Save our stack (after the frames) */
TrapFrame->Esi = (ULONG_PTR)V86Frame;