msvc6/ntoskrnl/ke_i386_stkswitch.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 2000 David Welch <welch@cwcom.net>
   4  *
   5  *  Moved to MSVC-compatible inline assembler by Mike Nordell, 2003-12-26
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21 /*
  22  * FILE:            ntoskrnl/ke/i386/vm86_sup.S
  23  * PURPOSE:         V86 mode support
  24  * PROGRAMMER:      David Welch (welch@cwcom.net)
  25  * UPDATE HISTORY:
  26  *                  Created 09/10/00
  27  */
  28
  29 /* INCLUDES ******************************************************************/
  30
  31 #pragma hdrstop
  32
  33 #include <ddk/ntddk.h>
  34 #include <ddk/status.h>
  35 #include <internal/i386/segment.h>
  36 #include <internal/i386/fpu.h>
  37 #include <internal/ps.h>
  38 #include <ddk/defines.h>
  39 #include <internal/v86m.h>
  40 #include <ntos/tss.h>
  41 //#include <ntos/service.h>
  42 #include <internal/trap.h>
  43 #include <internal/ps.h>
  44
  45 #include <roscfg.h>
  46 #include <internal/ntoskrnl.h>
  47 #include <internal/i386/segment.h>
  48
  49
  50 void KeReturnFromSystemCall();
  51
  52 /*
  53  * FUNCTION:     KeStackSwitchAndRet
  54  * PURPOSE:      Switch to a new stack and return from the first frame on
  55  *               the new stack which was assumed to a stdcall function with
  56  *               8 bytes of arguments and which saved edi, esi and ebx.
  57  */
  58 __declspec(naked)
  59 VOID STDCALL
  60 KeStackSwitchAndRet(PVOID NewStack)
  61 {
  62         __asm
  63         {
  64                 push    ebp
  65                 mov             ebp, esp
  66
  67                 cli
  68
  69                 mov             esp, NewStack
  70
  71                 sti
  72
  73                 pop             edi
  74                 pop             esi
  75                 pop             ebx
  76
  77                 pop             ebp
  78                 ret             8
  79         }
  80 }
  81
  82 __declspec(naked)
  83 VOID STDCALL
  84 KePushAndStackSwitchAndSysRet(ULONG Push, PVOID NewStack)
  85 {
  86         __asm
  87         {
  88                 push    ebp
  89                 mov             ebp, esp
  90
  91                 push    ebx
  92                 push    esi
  93                 push    edi
  94
  95                 cli
  96
  97                 push    8[ebp]
  98
  99                 mov             ebx, fs:KPCR_CURRENT_THREAD
 100                 mov             KTHREAD_CALLBACK_STACK[ebx], esp
 101                 mov             esp, 12[ebp]
 102
 103                 sti
 104
 105                 push    0
 106                 call    KeLowerIrql
 107
 108                 jmp             KeReturnFromSystemCall
 109         }
 110 }