diff options
Diffstat (limited to 'private/ntos/nbt/vxd/vxdfile.asm')
| -rw-r--r-- | private/ntos/nbt/vxd/vxdfile.asm | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/private/ntos/nbt/vxd/vxdfile.asm b/private/ntos/nbt/vxd/vxdfile.asm new file mode 100644 index 000000000..05c7e855d --- /dev/null +++ b/private/ntos/nbt/vxd/vxdfile.asm @@ -0,0 +1,314 @@ +;/**********************************************************************/ +;/** Microsoft Windows/NT **/ +;/** Copyright(c) Microsoft Corp., 1993 **/ +;/**********************************************************************/ + +;/* +; vxdFile.asm +; +; Contains simple VXD File I/O routines for lmhosts support +; +; FILE HISTORY: +; Johnl 06-Oct-1993 Created +; +;*/ + + .386p + include vmm.inc + include v86mmgr.inc + include dosmgr.inc + include opttest.inc + include netvxd.inc + include debug.inc + +; +; Must match manifest in vxd\fileio.c +; +LMHOSTS_READ_BUFF_SIZE equ 256 + +EXTRN _pMappedFilePath:DWORD +EXTRN _pMappedFileBuff:DWORD +EXTRN _pFileBuff:DWORD +EXTRN _pFilePath:DWORD +EXTRN _fInInit:DWORD + +EXTRN _GetInDosFlag:NEAR + +;**************************************************************************** +;** CheckInDos Macro +; +; Breaks if the Indos flag is set +; +; Uses EAX +; +CheckInDos MACRO +IFDEF DEBUG + push eax + cmp _fInInit, 0 ; Can't call while initializing + jnz @f + call _GetInDosFlag + cmp ax, 0 + je @f + Debug_Out "In dos flag set and about to make dos call!" +@@: + pop eax +ENDIF +ENDM + +;**************************************************************************** +;** PushState Macro +; +; Saves the client state and begins nested exec block. ebx will contain +; the current VM's client handle +; +; Uses ECX!! +; EBX will be set to the client area +; +PushState MACRO + + CheckInDos + + push ebx + VMMcall Get_Cur_VM_Handle ; Puts current handle into EBX + mov ebx, [ebx.CB_Client_Pointer] + + mov ecx, 0 + VMMCall Begin_Critical_Section + + Push_Client_State ; This pushes lots of crap + VMMcall Begin_Nest_V86_Exec +ENDM + +;**************************************************************************** +;** PopState Macro +; +; Restores client state and ends the nested exec block +; +; +PopState MACRO + + VMMcall End_Nest_Exec + Pop_Client_State + + VMMCall End_Critical_Section + + pop ebx + +ENDM + + +VxD_ICODE_SEG + +;**************************************************************************** +;** _VxdInitLmHostsSupport +; +; Allocates and maps memory for lmhosts support +; +; This is an Init time only routine +; +; Entry: [ESP+4] - Pointer to full path of file, +; [ESP+8] - strlen of path +; +; Exit: TRUE if successful, FALSE otherwise +; +BeginProc _VxdInitLmHostsSupport + push esi + push edi + + mov ecx, [esp+16] + add ecx, LMHOSTS_READ_BUFF_SIZE + + push ecx ; save ecx for the map call + VMMCall _Allocate_Global_V86_Data_Area, <ecx, GVDAZeroInit> + pop ecx + or eax,eax ; zero if error + jz ILMH_50 + + push eax + mov _pFileBuff, eax ; Save the linear address so we can access + add eax, LMHOSTS_READ_BUFF_SIZE ; from the vxd + mov _pFilePath, eax + pop eax + + shl eax, 12 ; Convert linear to V86 address + shr ax, 12 + + mov _pMappedFileBuff, eax + add eax, LMHOSTS_READ_BUFF_SIZE + mov _pMappedFilePath, eax + + jmp ILMH_70 + +ILMH_40: + ; Free allocated V86 global memory (how?) + + +ILMH_50: + ; error occurred, eax already contains zero + + +ILMH_70: + pop edi + pop esi + ret + +EndProc _VxdInitLmHostsSupport + + +;**************************************************************************** +;** _VxdWindowsPath +; +; Gets a pointer to (null-terminated) path to the windows directory +; +; This is an Init time only routine +; +; Entry: nothing +; +; Exit: pointer to path to windows directory +; +BeginProc _VxdWindowsPath + PushState ; Pushes lots of crap + + VmmCall Get_Config_Directory + + mov eax, edx ; path is returned in edx + + PopState ; now pop all that crap + + ret + +EndProc _VxdWindowsPath + +VxD_ICODE_ENDS + +VxD_CODE_SEG + +;**************************************************************************** +;** _VxdFileOpen +; +; Opens a file +; +; Entry: [ESP+4] - Pointer to full path of file, path must be mapped +; to v86 memory before calling this +; +; Exit: EAX will contain a handle to the openned file +; +BeginProc _VxdFileOpen + + push edi + push esi + + mov dx, word ptr [esp+12] ; Just the offset + mov di, word ptr [esp+14] ; Just the segment + + PushState ; This pushes lots of crap + + mov [ebx.Client_ax], 3d00h ; Open file, read only, share + mov [ebx.Client_dx], dx + mov [ebx.Client_ds], di + + mov eax, 21h + VmmCall Exec_Int + test [ebx.Client_Flags], CF_Mask ; Carry set if error + jz VFO_6 ; Carry set if error + + mov eax, 0 ; Failed to open the file + jmp VFO_10 + +VFO_6: + movzx eax, [ebx.Client_ax] ; Handle of file + +VFO_10: + PopState + + pop esi + pop edi + ret +EndProc _VxdFileOpen + + +;**************************************************************************** +;** _VxdFileRead +; +; Reads x bytes from a previously openned file +; +; Entry: [ESP+4] - Handle from _VxdFileOpen +; [ESP+8] - Count of bytes to read +; [ESP+12]- Mapped memory of destination buffer +; +; Exit: EAX will contain the number of bytes read, 0 if EOF or +; an error occurred. +; +BeginProc _VxdFileRead + + push edi + push esi + + mov ax, [esp+12] ; File Handle + mov si, [esp+16] ; Bytes to read + mov dx, [esp+20] ; Just the offset + mov di, [esp+22] ; Just the segment + + PushState ; Pushes lots of crap (uses cx) + + mov [ebx.Client_ax], 3f00h ; File Read + mov [ebx.Client_bx], ax ; File Handle + mov [ebx.Client_cx], si ; Bytes to read + mov [ebx.Client_dx], dx ; Mapped destination buffer + mov [ebx.Client_ds], di + + mov eax, 21h + VmmCall Exec_Int + test [ebx.Client_Flags], CF_Mask ; Carry set if error + jz VFR_6 ; Carry set if error + + mov eax, 0 ; Failed to open the file + jmp VFR_7 + +VFR_6: + movzx eax, [ebx.Client_ax] ; Bytes read + +VFR_7: + +VFR_10: + PopState + + pop esi + pop edi + ret +EndProc _VxdFileRead + + +;**************************************************************************** +;** _VxdFileClose +; +; Closes a file openned with VxdOpenFile +; +; Entry: [ESP+4] - Handle from _VxdFileOpen +; +BeginProc _VxdFileClose + + mov ax, [esp+4] ; File Handle + + PushState ; Pushes lots of crap + + mov [ebx.Client_ax], 3e00h ; File Close + mov [ebx.Client_bx], ax ; File Handle + + mov eax, 21h + VmmCall Exec_Int + test [ebx.Client_Flags], CF_Mask ; Carry set if error + jz VFCL_10 ; Carry set if error + + Debug_Out "VxdFileClose - Close failed" + mov eax, 0 ; Failed to close the file + +VFCL_10: + PopState + + ret +EndProc _VxdFileClose + + +VxD_CODE_ENDS +END |