You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
418 lines
11 KiB
418 lines
11 KiB
page ,132
|
|
|
|
if 0
|
|
/*++
|
|
|
|
Copyright (c) 1991 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
int5c.asm
|
|
|
|
Abstract:
|
|
|
|
This module contains the int 5c handler for the NT VDM redir TSR
|
|
|
|
Author:
|
|
|
|
Colin Watson (colinw) 5-Dec-1991
|
|
|
|
Environment:
|
|
|
|
Dos mode only
|
|
|
|
Revision History:
|
|
|
|
05-Dec-1991 colinw
|
|
Created
|
|
|
|
--*/
|
|
endif
|
|
|
|
|
|
|
|
.xlist
|
|
.xcref
|
|
include debugmac.inc ; debug display macros
|
|
include segorder.inc ; load order of 'redir' segments
|
|
include rdrsvc.inc ; BOP and SVC macros/dispatch codes
|
|
include int5c.inc ; Int to be used for pseudo network adapter
|
|
include asmmacro.inc ; jumps which may be short or near
|
|
include vrdlctab.inc ; VDM_REDIR_DOS_WINDOW
|
|
.cref
|
|
.list
|
|
|
|
.286 ; all code in this module 286 compatible
|
|
|
|
;
|
|
; Misc. local manifests
|
|
;
|
|
|
|
NETBIOS_STACK_SIZE equ 256
|
|
|
|
ResidentDataStart
|
|
NetbiosStack db NETBIOS_STACK_SIZE dup( 0 )
|
|
NetbiosStackTop label word
|
|
ResidentDataEnd
|
|
|
|
pic1 equ 20h
|
|
pic2 equ 0a0h
|
|
|
|
;
|
|
; The CCB1 definition
|
|
;
|
|
|
|
CCB struc
|
|
|
|
CCB_ADAPTER db ?
|
|
CCB_COMMAND db ?
|
|
CCB_RETCODE db ?
|
|
CCB_WORK db ?
|
|
CCB_POINTER dd ?
|
|
CCB_CMD_CMPL dd ?
|
|
CCB_PARM_TAB dd ?
|
|
|
|
CCB ends
|
|
|
|
ResidentCodeStart
|
|
assume cs:ResidentCode
|
|
assume ds:nothing
|
|
assume es:nothing
|
|
assume ss:nothing
|
|
|
|
public Old5cHandler
|
|
Old5cHandler dd ?
|
|
public OldNetworkHandler
|
|
OldNetworkHandler dd ?
|
|
|
|
|
|
; *** VDM REDIR INFO WINDOW
|
|
; *
|
|
; * ABSTRACT:
|
|
; * Used to share data structures between VDM device driver
|
|
; * in 32-bit mode and DOS-VDM. This data structure must be
|
|
; * excactly same as VDM_REDIR_DOS_WINDOW struct in vdmredir.h.
|
|
; *
|
|
; ***
|
|
public dwPostRoutineAddress
|
|
dwPostRoutineAddress: ; async post routine address
|
|
VDM_REDIR_DOS_WINDOW <>
|
|
|
|
; *** Int5cHandler
|
|
; *
|
|
; * Handles int 5c requests, in which we redirect work to netapi.dll
|
|
; *
|
|
; * ENTRY es:bx = Address of NCB or DLC CCB, if the
|
|
; * first byte less than 10H.
|
|
; *
|
|
; * EXIT al = NCB_RETCODE for NCB's
|
|
; *
|
|
; * RETURNS nothing
|
|
; *
|
|
; * USES nothing
|
|
; *
|
|
; * ASSUMES nothing
|
|
; *
|
|
; ***
|
|
|
|
public Int5cHandler
|
|
Int5cHandler proc near
|
|
|
|
;
|
|
; Perform a BOP into 32 bit mode to process the request.
|
|
; It's DLC if the first byte in ES:BX is less than 10h.
|
|
;
|
|
|
|
sti ; enable hw interrupts
|
|
cmp byte ptr es:[bx], 10H
|
|
jb call_dlc_5c
|
|
|
|
;
|
|
; deferred loading: if this call is from (presumably) DOSX checking to see if
|
|
; the 5C support is loaded, return the expected error without calling Netbios
|
|
; for real: this allows us to continue installation without having to load
|
|
; VDMREDIR.DLL until it is really required
|
|
;
|
|
|
|
cmp byte ptr es:[bx],7fh ; NETBIOS presence check
|
|
je @f
|
|
cmp byte ptr es:[bx],0ffh ; async NETBIOS presence check
|
|
je @f
|
|
SVC SVC_NETBIOS5C
|
|
iret
|
|
@@: mov al,3 ; INVALID COMMAND error
|
|
mov es:[bx].ncb_retcode,al ; returned in NCB_RETCODE && al
|
|
mov es:[bx].ncb_cmd_cplt,al ; and NCB_CMD_CPLT
|
|
iret
|
|
|
|
;
|
|
; call is for DLC. DLC does not return anything in registers. Command completion
|
|
; is either via an 'appendage' (call-back to you and me) or by the app polling
|
|
; the CCB_RETCODE field of the CCB in ES:BX for a change from 0xFF
|
|
;
|
|
|
|
call_dlc_5c:
|
|
|
|
;
|
|
; BOP into 32-bit DOS DLC emulator. This will return in AL the status of the
|
|
; CCB request: 0xFF if the command will complete asynchronously, else a
|
|
; synchrnous completion code
|
|
;
|
|
|
|
SVC SVC_DLC_5C
|
|
|
|
;
|
|
; if the CCB completed (synchronously) and there is an 'appendage' (who do IBM
|
|
; have writing this stuff?) then we must call it. We check the return code in
|
|
; AL since the return in the CCB may be the final code (ie already changed by
|
|
; the asynchronous completion thread in 32-bit DOS DLC emulator)
|
|
;
|
|
|
|
cmp al,0ffh ; is the command active?
|
|
je @f ; yes - return to the app
|
|
|
|
;
|
|
; the 32-bit DOS DLC emulator returned a synchronous completion code. We
|
|
; complete the CCB by calling the 'appendage'. The appendage is pointed at
|
|
; by the CCB_CMD_CMPL field in the CCB. If this field is 0:0 then the app
|
|
; has not provided an 'appendage' and will periodically look at the CCB_RETCODE
|
|
; field until the 32-bit emulator's asynchronous completion thread writes
|
|
; something there other than 0xFF
|
|
;
|
|
|
|
pusha ; save caller's registers
|
|
mov cx,word ptr es:[bx].CCB_CMD_CMPL
|
|
or cx,word ptr es:[bx].CCB_CMD_CMPL[2]
|
|
jz no_go
|
|
|
|
;
|
|
; we have an appendage. The manual says: cx=adapter #, es:bx=CCB, ss:sp=stack (!)
|
|
; cs=appendage cs (!!). Simulate an interrupt (ints off - that's what it says)
|
|
;
|
|
|
|
mov cl,byte ptr es:[bx].CCB_ADAPTER
|
|
xor ch,ch
|
|
xor ah,ah
|
|
pushf ; simulate INT
|
|
cli ; all ints are off
|
|
call dword ptr es:[bx].CCB_CMD_CMPL
|
|
|
|
;
|
|
; appendage irets here, we restore the caller's registers and wend our merry
|
|
; walker
|
|
;
|
|
|
|
no_go: popa ; restore caller's context
|
|
@@: iret
|
|
|
|
Int5cHandler endp
|
|
|
|
; *** IntNetworkHandler
|
|
; *
|
|
; * Handles int Network requests, in which we redirect work to netapi.dll
|
|
; *
|
|
; * NOTE: !!! This routine is NOT re-entrant: it sets up a new stack !!!
|
|
; *
|
|
; * ENTRY nothing
|
|
; *
|
|
; * EXIT nothing
|
|
; *
|
|
; * RETURNS nothing
|
|
; *
|
|
; * USES nothing
|
|
; *
|
|
; * ASSUMES nothing
|
|
; *
|
|
; ***
|
|
|
|
even
|
|
|
|
InterruptedStack dd ?
|
|
|
|
if DEBUG
|
|
ReEntered db 0
|
|
endif
|
|
|
|
public IntNetworkHandler
|
|
IntNetworkHandler proc near
|
|
|
|
assume cs:ResidentCode
|
|
assume ds:nothing
|
|
assume es:nothing
|
|
assume ss:nothing
|
|
|
|
if DEBUG
|
|
cmp ReEntered,0
|
|
jne __re_entry
|
|
inc ReEntered
|
|
jmps @f
|
|
|
|
__re_entry:
|
|
DbgPrintString <"ERROR: IntNetworkHandler re-entered",13,10>
|
|
push ds
|
|
push es
|
|
push ax
|
|
sub ax,ax
|
|
dec ax
|
|
mov ds,ax ; ds = es = -1 signals re-entrancy
|
|
mov es,ax
|
|
DbgUnsupported
|
|
DbgBreakPoint
|
|
pop ax
|
|
pop es
|
|
pop ds
|
|
@@:
|
|
endif
|
|
|
|
;
|
|
; Switch stacks and call the post routine
|
|
;
|
|
|
|
push ax ; interrupted ax on interrupted stack
|
|
; push dx ; dx
|
|
mov word ptr InterruptedStack,sp
|
|
mov word ptr InterruptedStack[2],ss
|
|
mov ax,seg NetbiosStack
|
|
mov ss,ax
|
|
mov sp,offset NetbiosStackTop
|
|
|
|
;
|
|
; perform a BOP into 32 bit mode to process the request.
|
|
;
|
|
; 32 bit code returns:
|
|
;
|
|
; ZF = 0, CF = 0 nothing to do (2 jumps)
|
|
; ZF = 0, CF = 1 async named pipe post processing (1 jump)
|
|
; ZF = 1, CF = 0 DLC post processing (1 jump)
|
|
; ZF = 1, CF = 1 NCB post processing (0 jumps)
|
|
;
|
|
; CAVEAT: if we extend this interface to have >3 options + do nothing, then
|
|
; we need to change to setting a value in a (unused) register (bp?)
|
|
;
|
|
|
|
pusha ; rest of interrupted registers on our stack
|
|
push ds
|
|
push es
|
|
SVC SVC_NETBIOS5CINTERRUPT
|
|
jmpne nothing_or_nmpipe
|
|
jmpnc dlc_processing
|
|
|
|
;
|
|
; Call post routine, it returns with IRET => push flags to stack.
|
|
; We must not change any registers between BOP and post routine!
|
|
; Note: NCB post processing is currently on fastest path. May need
|
|
; to change to DLC. Check it out in performance phase
|
|
;
|
|
|
|
pushf ; fake interrupt call
|
|
call es:[bx].ncb_post
|
|
jmps exit_IntNetworkHandler
|
|
|
|
nothing_or_nmpipe:
|
|
jmpnc exit_IntNetworkHandler
|
|
|
|
;
|
|
; default is async named-pipe processing. The BOP handler returns us the
|
|
; following:
|
|
; AL = 0 => ordinary (not AsyncNmPipe2) call
|
|
; AL != 0 => call is DosReadAsyncNmPipe2 or DosWriteAsyncNmPipe2
|
|
; CX:BX = address of ANR
|
|
; DS:SI = address of data buffer
|
|
; ES:DI = 'semaphore' handle for AsyncNmPipe2 call
|
|
;
|
|
; if the async name pipe function call didn't specify a semaphore, then don't
|
|
; push anything to stack since the ANR itself knows how many parameters will
|
|
; be on the stack. We expect it to ret n
|
|
;
|
|
|
|
DbgPrintString <"AsyncNmPipe callback!", 13, 10>
|
|
or al,al
|
|
jz @f
|
|
push es ; semaphore handle for type2 calls
|
|
push di
|
|
@@: push ds ; buffer address
|
|
push si
|
|
|
|
;
|
|
; the ANR is a pascal function which will clean the stack before returning. We
|
|
; push the ANR address and fake a far call. The ANR will return to
|
|
; exit_IntNetworkHandler. We futz the stack anyway, so we may as well avoid
|
|
; an extra jump
|
|
;
|
|
|
|
push cs ; store far return addr on the stack
|
|
push offset exit_IntNetworkHandler
|
|
push cx ; fake far call to ANR
|
|
push bx
|
|
retf
|
|
|
|
;
|
|
; DLC post processing: 32-bit code has set relevant registers and put post
|
|
; routine address in dwPostRoutineAddress. Must make sure that post address
|
|
; (ie 'appendage' address) is not 0:0
|
|
;
|
|
|
|
dlc_processing:
|
|
cmp word ptr dwPostRoutineAddress,0
|
|
jne @f
|
|
cmp word ptr dwPostRoutineAddress[2],0
|
|
je exit_IntNetworkHandler ; huh?
|
|
|
|
;
|
|
; there is a non-zero post routine address set in the BOP. Simulate an
|
|
; interrupt into the post routine (appendage)
|
|
;
|
|
|
|
@@: pushf ; fake interrupt call
|
|
; cli ; manual says ints off
|
|
call dword ptr dwPostRoutineAddress
|
|
|
|
;
|
|
; restore the interrupted registers and stack
|
|
;
|
|
|
|
exit_IntNetworkHandler:
|
|
pop es
|
|
pop ds
|
|
popa
|
|
mov ss,word ptr InterruptedStack[2]
|
|
mov sp,word ptr InterruptedStack
|
|
; pop dx ; interrupted dx
|
|
|
|
;;
|
|
;; re-enable the 8259s
|
|
;;
|
|
;
|
|
; mov al,20h
|
|
;
|
|
;;
|
|
;; Edge triggered assuming interrupt on slave pic as per the AT
|
|
;;
|
|
;
|
|
; out pic2,al ; EOI pic 2
|
|
; out pic1,al ; EOI pic 1
|
|
;
|
|
;;
|
|
;; Level triggered assuming interrupt on slave pic
|
|
;;
|
|
;; out pic1,al ; EOI pic 1
|
|
;; out pic2,al ; EOI pic 2
|
|
;
|
|
;;
|
|
;; assuming interrupt on master pic
|
|
;; out pic1,al ; EOI pic 1
|
|
;;
|
|
|
|
pop ax ; interrupted ax
|
|
|
|
if DEBUG
|
|
dec ReEntered
|
|
endif
|
|
|
|
SVC SVC_RDRINTACK2
|
|
iret ; back to interrupted code
|
|
; jmp dword ptr OldNetworkHandler
|
|
IntNetworkHandler endp
|
|
|
|
ResidentCodeEnd
|
|
end
|