+++ /dev/null
-/*
- * ReactOS kernel
- * Copyright (C) 2000 David Welch <welch@cwcom.net>
- *
- * Moved to MSVC-compatible inline assembler by Mike Nordell, 2003-12-25
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-/*
- * FILE: ntoskrnl/ke/i386/vm86_sup.S
- * PURPOSE: V86 mode support
- * PROGRAMMER: David Welch (welch@cwcom.net)
- * UPDATE HISTORY:
- * Created 09/10/00
- */
-
-/* INCLUDES ******************************************************************/
-
-#pragma hdrstop
-
-#include <ddk/ntddk.h>
-#include <ddk/status.h>
-#include <internal/i386/segment.h>
-#include <internal/i386/fpu.h>
-#include <internal/ps.h>
-#include <ddk/defines.h>
-#include <internal/v86m.h>
-#include <ntos/tss.h>
-#include <internal/trap.h>
-#include <internal/ps.h>
-
-#include <roscfg.h>
-#include <internal/ntoskrnl.h>
-#include <internal/i386/segment.h>
-#include <internal/ps.h>
-
-
-// Taken from ntoskrnl/include/internal/v86m.h, since that one must be fixed
-// a bit before it could be used from here.
-#define KV86M_REGISTERS_EBP (0x0)
-#define KV86M_REGISTERS_EDI (0x4)
-#define KV86M_REGISTERS_ESI (0x8)
-#define KV86M_REGISTERS_EDX (0xC)
-#define KV86M_REGISTERS_ECX (0x10)
-#define KV86M_REGISTERS_EBX (0x14)
-#define KV86M_REGISTERS_EAX (0x18)
-#define KV86M_REGISTERS_DS (0x1C)
-#define KV86M_REGISTERS_ES (0x20)
-#define KV86M_REGISTERS_FS (0x24)
-#define KV86M_REGISTERS_GS (0x28)
-#define KV86M_REGISTERS_EIP (0x2C)
-#define KV86M_REGISTERS_CS (0x30)
-#define KV86M_REGISTERS_EFLAGS (0x34)
-#define KV86M_REGISTERS_ESP (0x38)
-#define KV86M_REGISTERS_SS (0x3C)
-
-
-void KiV86Complete();
-
-
- /*
- * Starts in v86 mode with the registers set to the
- * specified values.
- */
-
-__declspec(naked)
-VOID Ki386RetToV86Mode(KV86M_REGISTERS* InRegs,
- KV86M_REGISTERS* OutRegs)
-{
- __asm
- {
- /*
- * Setup a stack frame
- */
- push ebp
- mov ebp, esp
-
- pushad /* Save registers */
-
- mov ebx, InRegs
-
- /*
- * Save ebp
- */
- push ebp
-
- /*
- * Save a pointer to IN_REGS which the v86m exception handler will
- * use to handle exceptions
- */
- push ebx
-
- /*
- * Since we are going to fiddle with the stack pointer this must be
- * a critical section for this processor
- */
-
- /*
- * Save the old initial stack
- */
- mov esi, fs:KPCR_CURRENT_THREAD
- mov edi, KTHREAD_INITIAL_STACK[esi]
- push edi
-
- /*
- * We also need to set the stack in the kthread structure
- */
- mov KTHREAD_INITIAL_STACK[esi], esp
-
- /*
- * The stack used for handling exceptions from v86 mode in this thread
- * will be the current stack adjusted so we don't overwrite the
- * existing stack frames
- */
- mov esi, fs:KPCR_TSS
- mov KTSS_ESP0[esi], esp
-
- /*
- * Create the stack frame for an iret to v86 mode
- */
- push KV86M_REGISTERS_GS[ebx]
- push KV86M_REGISTERS_FS[ebx]
- push KV86M_REGISTERS_DS[ebx]
- push KV86M_REGISTERS_ES[ebx]
- push KV86M_REGISTERS_SS[ebx]
- push KV86M_REGISTERS_ESP[ebx]
- push KV86M_REGISTERS_EFLAGS[ebx]
- push KV86M_REGISTERS_CS[ebx]
- push KV86M_REGISTERS_EIP[ebx]
-
- /*
- * Setup the CPU registers
- */
- mov eax, KV86M_REGISTERS_EAX[ebx]
- mov ecx, KV86M_REGISTERS_ECX[ebx]
- mov edx, KV86M_REGISTERS_EDX[ebx]
- mov esi, KV86M_REGISTERS_ESI[ebx]
- mov edi, KV86M_REGISTERS_EDI[ebx]
- mov ebp, KV86M_REGISTERS_EBP[ebx]
- mov ebx, KV86M_REGISTERS_EBX[ebx]
-
- /*
- * Go to v86 mode
- */
- iretd
-
- /*
- * Handle the completion of a vm86 routine. We are called from
- * an exception handler with the registers at the point of the
- * exception on the stack.
- */
-
- jmp KiV86Complete // TMN: Function-splitting
- }
-}
-
-__declspec(naked)
-void KiV86Complete()
-{
- __asm
- {
- /* Restore the original ebp */
- mov ebp, TF_ORIG_EBP[esp]
-
- /* Get a pointer to the OUT_REGS structure */
- mov ebx, 12[ebp] // OutRegs
-
- /* Skip debug information and unsaved registers */
- add esp, 0x30
-
- /* Ignore 32-bit segment registers */
- add esp, 12
-
- /* Save the vm86 registers into the OUT_REGS structure */
- pop dword ptr KV86M_REGISTERS_EDX[ebx]
- pop dword ptr KV86M_REGISTERS_ECX[ebx]
- pop dword ptr KV86M_REGISTERS_EAX[ebx]
-
- /* Restore the old previous mode */
- pop eax
- mov ss:KTHREAD_PREVIOUS_MODE[esi], al
-
- /* Restore the old exception handler list */
- pop eax
- mov fs:KPCR_EXCEPTION_LIST, eax
-
- /* Ignore the 32-bit fs register */
- add esp, 4
-
- pop dword ptr KV86M_REGISTERS_EDI[ebx]
- pop dword ptr KV86M_REGISTERS_ESI[ebx]
- pop dword ptr KV86M_REGISTERS_EBX[ebx]
- pop dword ptr KV86M_REGISTERS_EBP[ebx]
-
- /* Ignore error code */
- add esp, 4
-
- pop dword ptr KV86M_REGISTERS_EIP[ebx]
- pop dword ptr KV86M_REGISTERS_CS[ebx]
- pop dword ptr KV86M_REGISTERS_EFLAGS[ebx]
- pop dword ptr KV86M_REGISTERS_ESP[ebx]
- pop dword ptr KV86M_REGISTERS_SS[ebx]
- pop dword ptr KV86M_REGISTERS_ES[ebx]
- pop dword ptr KV86M_REGISTERS_DS[ebx]
- pop dword ptr KV86M_REGISTERS_FS[ebx]
- pop dword ptr KV86M_REGISTERS_GS[ebx]
-
- /*
- * We are going to fiddle with the stack so this must be a critical
- * section for this process
- */
- cli
-
- /*
- * Restore the initial stack
- */
- pop eax
- mov esi, fs:KPCR_TSS
- mov KTSS_ESP0[esi], eax
-
- /*
- * We also need to set the stack in the kthread structure
- */
- mov esi, fs:KPCR_CURRENT_THREAD
- mov edi, KTHREAD_INITIAL_STACK[esi]
- mov KTHREAD_INITIAL_STACK[esi], eax
-
- /* Exit the critical section */
- sti
-
- /* Ignore IN_REGS pointer */
- add esp, 4
-
- /* Ignore ebp restored above */
- add esp, 4
-
- /* Return to caller */
- popad
- mov esp, ebp
- pop ebp
- ret
-
- } // end of __asm block
-}
\ No newline at end of file
projects / reactos.git / blobdiff