165 lines
3.7 KiB
NASM
165 lines
3.7 KiB
NASM
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page ,132
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/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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int2a.asm
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Abstract:
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This module contains the int 2a handler for the NT VDM redir TSR
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Author:
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Richard L Firth (rfirth) 29-Oct-1991
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Environment:
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Dos mode only
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Revision History:
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05-Sep-1991 rfirth
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Created
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--*/
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endif
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.xlist
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.xcref
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include rdrsvc.inc ; SVC
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include debugmac.inc ; debug display macros
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include segorder.inc ; load order of 'redir' segments
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.cref
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.list
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.286 ; all code in this module 286 compatible
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ResidentCodeStart
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assume cs:ResidentCode
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assume ds:nothing
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assume es:nothing
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assume ss:nothing
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public Old2aHandler
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Old2aHandler dd ?
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; *** Int2aHandler
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; *
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; * Handles int 2a requests, in which we pretend to be minses and any
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; * other missing parts of the net stack
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; *
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; * ENTRY function code in ah:
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; * ah = 0, return ah = 1
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; * ah = 1, Cooked NetBIOS call
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; * ah = 4, al = 0, same as ah = 1
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; * al = 1, Raw NetBIOS call
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; * al = 2, unknown function; we don't handle it
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; * See doslan\minses\int2a.inc in LANMAN
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; * project for details
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; * ah = 5, Get Adapter Resources. Returns in CX number of
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; * available NCBs and in DX the number of available
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; * sessions. We don't (as yet) handle this
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; *
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; * es:bx = NCB
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; *
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; * EXIT See above
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; *
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; * USES ax, flags
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; *
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; * ASSUMES nothing
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; *
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; ***
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public Int2aHandler
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Int2aHandler proc near
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or ah,ah ; installation check
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jz increment_ah_and_return
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;
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; not installation. Check for cooked/raw netbios calls
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;
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cmp ah,1
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je cooked
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cmp ah,4
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je cooked_or_raw
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cmp ah,5
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je get_adapter_resources
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;DbgPrintString "Int2aHandler: unrecognized request: "
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;DbgPrintHexWord ax
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;DbgCrLf
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;
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; the call is not for us - chain to the next Int 2A handler
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;
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chain_next_handler:
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DbgUnsupported
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jmp Old2aHandler
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cooked_or_raw:
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or al,al ; ax = 0x0400?
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jz cooked ; yes - cooked
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cmp al,1 ; ax = 0x0401?
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je raw ; yes - raw
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cmp al,2 ; ax = 0x0402?
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jne chain_next_handler ; yes - same as raw; no - chain next
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;
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; raw request: just call NetBios via INT 5C and set ah dependent upon whether
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; an error was returned from NetBios
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;
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raw: int 5ch
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sub ah,ah
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or al,al
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jz @f
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increment_ah_and_return:
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inc ah
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@@: iret
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get_adapter_resources:
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mov ax,1
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mov bx,16
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mov cx,128
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mov dx,64
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iret
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;
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; 'cooked' call: this tries to convert synchronous NetBios calls to asynchronous
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; then spins & beeps until the command has completed. Some commands are retried
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; for a certain time or number of retries
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;
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;
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; there is no justification for doing the 'cooked' processing that MINSES proper
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; performs: The cooked processing is mainly to give the poor DOS user peace of
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; mind when his machine seems dead, by occasionally beeping in a meaningful
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; manner. Since we can terminate DOS sessions with impunity, there seems little
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; point in letting the user know the machine is still alive, or retrying commands
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; for that matter. However, that may change...
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;
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cooked:
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DbgUnsupported
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jmp short raw ; fudge it for now
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Int2aHandler endp
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ResidentCodeEnd
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end
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