133 lines
3.2 KiB
NASM
133 lines
3.2 KiB
NASM
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title "LPC Move Message Support"
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;++
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;
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; Copyright (c) 1989 Microsoft Corporation
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;
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; Module Name:
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;
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; lpcmove.asm
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;
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; Abstract:
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;
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; This module implements functions to support the efficient movement of
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; LPC Message blocks
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;
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; Author:
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;
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; Steven R. Wood (stevewo) 30-Jun-1989
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;
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; Environment:
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;
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; Kernel mode only.
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;
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; Revision History:
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;
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; 6-Mar-90 bryanwi
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; Ported to the 386.
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;
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;--
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.386p
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include callconv.inc ; calling convention macros
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page ,132
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subttl "Update System Time"
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_PAGE SEGMENT DWORD PUBLIC 'CODE'
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ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
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;++
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;
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; VOID
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; LpcpMoveMessage (
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; OUT PPORT_MESSAGE DstMsg
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; IN PPORT_MESSAGE SrcMsg
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; IN ULONG MsgType OPTIONAL,
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; IN PCLIENT_ID ClientId OPTIONAL
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; )
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;
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; Routine Description:
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;
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; This function moves an LPC message block.
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;
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; Arguments:
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;
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; DstMsg (TOS) - Supplies pointer to where to move the message block to.
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;
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; SrcMsg (TOS+4) - Supplies a pointer to the message to move.
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;
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; MsgType (TOS+8) - If non-zero, then store in Type field of DstMsg
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;
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; ClientId (TOS+12) - If non-NULL, then points to a ClientId to copy to dst
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;
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; Return Value:
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;
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; None
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;
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;--
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DstMsg equ [esp + 12]
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SrcMsg equ [esp + 16]
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SrcMsgData equ [esp + 20]
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MsgType equ [esp + 24]
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ClientId equ [esp + 28]
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cPublicProc _LpcpMoveMessage ,5
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push esi ; Save non-volatile registers
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push edi
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mov edi,DstMsg ; (edi)->Destination
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cld
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mov esi,SrcMsg ; (esi)->Source
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lodsd ; (eax)=length
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stosd
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lea ecx,3[eax]
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and ecx,0FFFCH ; (ecx)=length rounded up to 4
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shr ecx,2 ; (ecx)=length in dwords
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lodsd ; (eax)=DataInfoOffset U Type
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mov edx,MsgType ; (edx)=MsgType
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or edx,edx
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jz lmm10 ; No MsgType, go do straight copy
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mov ax,dx ; (eax low 16)=MsgType
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lmm10: stosd
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mov edx,ClientId ; (edx)=ClientId
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or edx,edx
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jz lmm20 ; No Clientid to set, go do copy
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mov eax,[edx] ; Get new ClientId
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stosd ; and store in DstMsg->ClientId
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mov eax,[edx+4]
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stosd
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add esi,8 ; and skip over SrcMsg->ClientId
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jmp short lmm30
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lmm20: movsd ; Copy ClientId
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movsd
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;
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; At this point, all of the control structures are copied, all we
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; need to copy is the data.
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;
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lmm30:
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movsd ; Copy MessageId
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movsd ; Copy ClientViewSize
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mov esi,SrcMsgData ; Copy data directly from user buffer
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rep movsd ; Copy the data portion of message
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pop edi
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pop esi ; Restore non-volatile registers
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stdRET _LpcpMoveMessage
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stdENDP _LpcpMoveMessage
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_PAGE ends
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end
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