- We do not speak about the v86 hack.

- This should fix the V86 GPF error.

svn path=/trunk/; revision=23700

reactos/ntoskrnl/include/internal/i386/ke.h

@@ -44,6 +44,8 @@
 
 #define FRAME_EDITED        0xFFF8
 
+#define WE_DO_NOT_SPEAK_ABOUT_THE_V86_HACK 1
+
 #ifndef __ASM__
 
 extern ULONG Ke386CacheAlignment;

reactos/ntoskrnl/ke/i386/ctxswitch.S

@@ -299,6 +299,11 @@ 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
@@ -393,6 +398,11 @@ 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]
 

reactos/ntoskrnl/ke/i386/thread.c

@@ -14,6 +14,9 @@
 
 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;
@@ -233,6 +236,11 @@ 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);