81 lines
1.7 KiB
PHP
81 lines
1.7 KiB
PHP
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;++
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;Copyright (c) 1991 Microsoft Corporation
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;
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;Module Name:
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;
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; localmac.inc
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;
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;Abstract:
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;
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; Contains various macros to get around various things:
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;
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; DosCallBack
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;
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;
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;Author:
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;
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; Richard L Firth (rfirth) 27-Sep-1991
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;
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;Environment:
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;
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; DOS application mode only
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;
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;Revision History:
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;
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; 24-Sep-1991 rfirth
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; Created
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;
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;--
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;*** DosCallBack
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;*
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;* Call back into DOS via the int 2f/ah=12 back door. If CALL_DOS defined,
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;* use a call, else s/w interrupt. Using a call means no other TSRs etc.
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;* which load AFTER the redir can hook it, but we DON'T HAVE TO MAKE A
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;* PRIVILEGE TRANSITION ON x86 which speeds things up. This should be safe,
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;* because no other s/w should really be hooking INT 2F/AH=12
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;*
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;* ENTRY FunctionNumber - dispatch code goes in al
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;* DosAddr - if present, variable containing address of
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;* DOS int 2f entry point
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;* OldMultHandler - this variable contains the address of DOSs
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;* int 2f back door. Specific to redir code
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;*
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;* EXIT nothing
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;*
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;* USES ax, OldMultHandler
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;*
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;* ASSUMES nothing
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;*
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;***
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DosCallBack macro FunctionNumber, DosAddr
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mov ax,(MultDOS shl 8) + FunctionNumber
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ifdef CALL_DOS
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pushf
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ifb <DosAddr>
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if (((.type OldMultHandler) and 32) eq 0) ;; OldMultHandler not defined
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extrn OldMultHandler:dword
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endif
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call OldMultHandler
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else
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call DosAddr
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endif
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else
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int 2fh
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endif
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endm
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;
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; defines for DosCallBack FunctionNumbers
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;
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SF_FROM_SFN = 22
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GET_USER_STACK = 24
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PJFN_FROM_HANDLE= 32
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