From 3d10f77c92ab399a462bd6f74cd6211f31f7251e Mon Sep 17 00:00:00 2001
From: Alex Ionescu <aionescu@gmail.com>
Date: Wed, 30 Aug 2006 19:29:16 +0000
Subject: [PATCH] - It should now be safe to remove the V86 ESP0 hack, since
 V86 mode works fine (tested on VMWare/QEmu).

svn path=/trunk/; revision=23809
---
 reactos/ntoskrnl/include/internal/ke.h |  8 ++++++++
 reactos/ntoskrnl/ke/bug.c              | 13 ++-----------
 reactos/ntoskrnl/ke/i386/ctxswitch.S   | 10 ----------
 reactos/ntoskrnl/ke/i386/thread.c      |  8 --------
 4 files changed, 10 insertions(+), 29 deletions(-)

diff --git a/reactos/ntoskrnl/include/internal/ke.h b/reactos/ntoskrnl/include/internal/ke.h
index 3fdbe2066ee..13ebe848318 100644
--- a/reactos/ntoskrnl/include/internal/ke.h
+++ b/reactos/ntoskrnl/include/internal/ke.h
@@ -49,6 +49,13 @@ typedef struct _DISPATCH_INFO
     PKINTERRUPT_ROUTINE *FlatDispatch;
 } DISPATCH_INFO, *PDISPATCH_INFO;
 
+typedef PCHAR
+(NTAPI *PKE_BUGCHECK_UNICODE_TO_ANSI)(
+    IN PUNICODE_STRING Unicode,
+    IN PCHAR Ansi,
+    IN ULONG Length
+);
+
 struct _KIRQ_TRAPFRAME;
 struct _KPCR;
 struct _KPRCB;
@@ -76,6 +83,7 @@ extern ULONG KeI386EFlagsAndMaskV86;
 extern ULONG KeI386EFlagsOrMaskV86;
 extern BOOLEAN KeI386VirtualIntExtensions;
 extern KIDTENTRY KiIdt[];
+extern FAST_MUTEX KernelAddressSpaceLock;
 
 /* MACROS *************************************************************************/
 
diff --git a/reactos/ntoskrnl/ke/bug.c b/reactos/ntoskrnl/ke/bug.c
index 31ef95d2a07..10ddb3eb2fe 100644
--- a/reactos/ntoskrnl/ke/bug.c
+++ b/reactos/ntoskrnl/ke/bug.c
@@ -24,12 +24,10 @@ HalReleaseDisplayOwnership(
     VOID
 );
 
-extern FAST_MUTEX KernelAddressSpaceLock;
-
 /* GLOBALS *******************************************************************/
 
-LIST_ENTRY BugcheckCallbackListHead = {NULL,NULL};
-LIST_ENTRY BugcheckReasonCallbackListHead = {NULL,NULL};
+LIST_ENTRY BugcheckCallbackListHead;
+LIST_ENTRY BugcheckReasonCallbackListHead;
 ULONG KeBugCheckActive, KeBugCheckOwner;
 LONG KeBugCheckOwnerRecursionCount;
 PRTL_MESSAGE_RESOURCE_DATA KiBugCodeMessages;
@@ -38,13 +36,6 @@ ULONG KiHardwareTrigger;
 PUNICODE_STRING KiBugCheckDriver;
 ULONG_PTR KiBugCheckData[5];
 
-typedef PCHAR
-(NTAPI *PKE_BUGCHECK_UNICODE_TO_ANSI)(
-    IN PUNICODE_STRING Unicode,
-    IN PCHAR Ansi,
-    IN ULONG Length
-);
-
 /* PRIVATE FUNCTIONS *********************************************************/
 
 BOOLEAN
diff --git a/reactos/ntoskrnl/ke/i386/ctxswitch.S b/reactos/ntoskrnl/ke/i386/ctxswitch.S
index 1dc070b4eb0..b2fa214a489 100644
--- a/reactos/ntoskrnl/ke/i386/ctxswitch.S
+++ b/reactos/ntoskrnl/ke/i386/ctxswitch.S
@@ -299,11 +299,6 @@ BadThread:
     /* Save the Exception list */
     push [ebx+KPCR_EXCEPTION_LIST]
 
-#if WE_DO_NOT_SPEAK_ABOUT_THE_V86_HACK // V86 HACK
-    mov ecx, [ebx+KPCR_TSS]
-    push [ecx+KTSS_ESP0]
-#endif
-
     /* DPC shouldn't be active */
     cmp byte ptr [ebx+KPCR_PRCB_DPC_ROUTINE_ACTIVE], 0
     jnz BugCheckDpc
@@ -398,11 +393,6 @@ SameProcess:
     inc dword ptr [esi+KTHREAD_CONTEXT_SWITCHES]
     //inc dword ptr [esi+KPRC_PRCB_CONTEXT_SWITCHES]
 
-#if WE_DO_NOT_SPEAK_ABOUT_THE_V86_HACK
-    mov ebp, [ebx+KPCR_TSS]
-    pop [ebp+KTSS_ESP0]
-#endif
-
     /* Restore exception list */
     pop [ebx+KPCR_EXCEPTION_LIST]
 
diff --git a/reactos/ntoskrnl/ke/i386/thread.c b/reactos/ntoskrnl/ke/i386/thread.c
index 01898a57c86..b7469485525 100644
--- a/reactos/ntoskrnl/ke/i386/thread.c
+++ b/reactos/ntoskrnl/ke/i386/thread.c
@@ -14,9 +14,6 @@
 
 typedef struct _KSHARED_CTXSWITCH_FRAME
 {
-#if WE_DO_NOT_SPEAK_ABOUT_THE_V86_HACK // V86 HACK
-    ULONG_PTR Esp0;
-#endif
     PVOID ExceptionList;
     KIRQL WaitIrql;
     PVOID RetEip;
@@ -236,11 +233,6 @@ Ke386InitThreadWithContext(PKTHREAD Thread,
     CtxSwitchFrame->RetEip = KiThreadStartup;
     CtxSwitchFrame->WaitIrql = APC_LEVEL;
     CtxSwitchFrame->ExceptionList = (PVOID)0xFFFFFFFF;
-#if WE_DO_NOT_SPEAK_ABOUT_THE_V86_HACK // V86 HACK
-    CtxSwitchFrame->Esp0 = (ULONG_PTR)Thread->InitialStack -
-                                      sizeof(FX_SAVE_AREA) -
-                                      0x10;
-#endif
 
     /* Save back the new value of the kernel stack. */
     DPRINT("Final Kernel Stack: %x \n", CtxSwitchFrame);