119 lines
2.6 KiB
C
119 lines
2.6 KiB
C
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/**
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*** Copyright (C) 1996-97 Intel Corporation. All rights reserved.
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***
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*** The information and source code contained herein is the exclusive
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*** property of Intel Corporation and may not be disclosed, examined
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*** or reproduced in whole or in part without explicit written authorization
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*** from the company.
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**/
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/*++
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Copyright (c) 1995 Intel Corporation
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Module Name:
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lpcmove.c
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Abstract:
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This module implements functions to support the efficient movement
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of LPC message blocks.
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There is a corresponding .s version that is hand optimized.
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Need to evaluate and install one or the other.
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Author:
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Roy D'Souza (rdsouza) 5-May-96
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Revision History:
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--*/
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#include "lpcp.h"
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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 PUCHAR SrcMsgData,
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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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This function moves an LPC message block and optionally sets the message
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type and client id to the specified values.
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Arguments:
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DstMsg - Supplies a pointer to the destination message.
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SrcMsg - Supplies a pointer to the source message.
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SrcMsgData - Supplies a pointer to the source message data to
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copy to destination.
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MsgType - If non-zero, then store in type field of the
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destination message.
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ClientId - If non-NULL, then points to a ClientId to copy to
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the destination message.
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Return Value:
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None
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--*/
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{
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ULONG NumberDwords;
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//
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// Extract the data length and copy over the first dword
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//
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*((PULONG)DstMsg)++ = NumberDwords = *((PULONG)SrcMsg)++;
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NumberDwords = ((0x0000FFFF & NumberDwords) + 3) >> 2;
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//
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// Set the message type properly and update the second dword
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//
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*((PULONG)DstMsg)++ = MsgType == 0 ? *((PULONG)SrcMsg)++ :
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*((PULONG)SrcMsg)++ & 0xFFFF0000 | MsgType & 0xFFFF;
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//
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// Set the ClientId appropriately and update the third dword
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//
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*((PULONG_PTR)DstMsg)++ = ClientId == NULL ? *((PULONG_PTR)SrcMsg) :
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*((PULONG_PTR)ClientId)++;
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((PULONG_PTR)SrcMsg)++;
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*((PULONG_PTR)DstMsg)++ = ClientId == NULL ? *((PULONG_PTR)SrcMsg) :
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*((PULONG_PTR)ClientId);
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((PULONG_PTR)SrcMsg)++;
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//
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// Update the final two longwords in the header
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//
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*((PULONG_PTR)DstMsg)++ = *((PULONG_PTR)SrcMsg)++;
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*((PULONG_PTR)DstMsg)++ = *((PULONG_PTR)SrcMsg)++;
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//
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// Copy the data
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//
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if (NumberDwords > 0) {
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RtlCopyMemory(DstMsg, SrcMsgData, NumberDwords*sizeof(ULONG));
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}
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}
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