287 lines
8.7 KiB
C
287 lines
8.7 KiB
C
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/*****************************************************************************
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** **
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** COPYRIGHT (C) 2000, 2001 MKNET CORPORATION **
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** DEVELOPED FOR THE MK7100-BASED VFIR PCI CONTROLLER. **
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** **
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*****************************************************************************/
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/**********************************************************************
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Module Name:
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SIR.C
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Routines:
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NdisToSirPacket
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ComputeSirFCS
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ProcRXSir
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Comments:
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**********************************************************************/
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#include "precomp.h"
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#include "protot.h"
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#pragma hdrstop
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// SIR only
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const USHORT fcsTable[256] =
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{
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0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
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0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
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0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
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0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
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0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
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0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
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0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
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0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
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0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
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0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
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0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
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0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
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0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
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0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
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0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
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0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
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0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
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0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
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0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
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0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
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0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
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0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
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0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
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0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
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0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
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0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
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0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
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0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
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0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
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0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
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0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
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0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
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};
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ULONG __inline EscapeSlowIrData(PUCHAR Dest, UCHAR SourceByte)
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{
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switch (SourceByte){
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case SIR_BOF:
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case SIR_EOF:
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case SIR_ESC:
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Dest[0] = SIR_ESC;
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Dest[1] = SourceByte ^ SIR_ESC_COMP;
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return 2;
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default:
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Dest[0] = SourceByte;
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return 1;
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}
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}
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//-----------------------------------------------------------------------------
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// Procedure: [NdisToSirPacket]
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//-----------------------------------------------------------------------------
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BOOLEAN NdisToSirPacket (PMK7_ADAPTER Adapter,
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PNDIS_PACKET Packet,
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UCHAR *irPacketBuf,
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UINT irPacketBufLen,
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UINT *irPacketLen
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)
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{
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PNDIS_BUFFER CurrentBuffer, NextBuffer;
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UINT CurrentLength;
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PVOID VirtualAddress;
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PNDIS_BUFFER ndisBuf;
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UINT i, ndisPacketBytes = 0, I_fieldBytes, totalBytes = 0;
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UINT ndisPacketLen, numExtraBOFs;
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SIR_FCS_TYPE fcs;
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UCHAR nextChar;
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UCHAR *bufData;
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UINT bufLen;
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PNDIS_IRDA_PACKET_INFO packetInfo = GetPacketInfo(Packet);
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// Get the packet's entire length and its first NDIS buffer
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NdisQueryPacket(Packet, NULL, NULL, &ndisBuf, &ndisPacketLen);
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// Make sure that the packet is big enough to be legal.
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// It consists of an A, C, and variable-length I field.
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if (ndisPacketLen < ADDR_SIZE + CONTROL_SIZE){
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// DBGERR(("packet too short in NdisToIrPacket (%d bytes)", ndisPacketLen));
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return (FALSE);
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}
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else {
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I_fieldBytes = ndisPacketLen - ADDR_SIZE - CONTROL_SIZE;
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}
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// Make sure that we won't overwrite our contiguous buffer.
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// Make sure that the passed-in buffer can accomodate this packet's
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// data no matter how much it grows through adding ESC-sequences, etc.
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if (ndisPacketLen > MK7_MAXIMUM_PACKET_SIZE) {
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// The packet is too large
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// Tell the caller to retry with a packet size large
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// enough to get past this stage next time.
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//DBGERR(("Packet too large in NdisToIrPacket (%d=%xh bytes), MAX_IRDA_DATA_SIZE=%d, irPacketBufLen=%d.", ndisPacketLen, ndisPacketLen, MAX_IRDA_DATA_SIZE, irPacketBufLen));
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*irPacketLen = ndisPacketLen;
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return (FALSE);
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}
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if (!ndisBuf) {
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// DBGERR(("No NDIS_BUFFER in NdisToIrPacket"));
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return (FALSE);
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}
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CurrentBuffer = ndisBuf;
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while (CurrentBuffer != NULL) {
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NdisQueryBufferSafe(CurrentBuffer, &VirtualAddress, &CurrentLength, 16);
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if (!VirtualAddress) {
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#if DBG
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DbgPrint("==> Throw Away Failed Packet\n\r");
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#endif
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return (FALSE);
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}
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NdisGetNextBuffer(CurrentBuffer, &NextBuffer);
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CurrentBuffer = NextBuffer;
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}
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// NDIS requirement
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// NdisQueryBuffer(ndisBuf, (PVOID *)&bufData, &bufLen);
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NdisQueryBufferSafe(ndisBuf, (PVOID *)&bufData, &bufLen,16);
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/*
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* Now begin building the IR frame.
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*
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* This is the final format:
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*
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* extra BOFs ...
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* BOF (1)
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* NdisMediumIrda packet (what we get from NDIS):
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* Address (1)
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* Control (1)
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* FCS (2)
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* EOF (1)
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*/
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// Prepend BOFs (extra BOFs + 1 actual BOF)
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// 4.1.0
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if ((Adapter->HwVersion==HW_VER_1) && (Adapter->CurrentSpeed <= MAX_SIR_SPEED))
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numExtraBOFs = HW_VER_1_EBOFS;
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else
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numExtraBOFs = packetInfo->ExtraBOFs;
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if (numExtraBOFs > MAX_EXTRA_SIR_BOFS) {
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numExtraBOFs = MAX_EXTRA_SIR_BOFS;
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}
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for (i = totalBytes = 0; i < numExtraBOFs; i++) {
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*(SIR_BOF_TYPE *)(irPacketBuf+totalBytes) = SIR_EXTRA_BOF;
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totalBytes += SIR_EXTRA_BOF_SIZE;
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}
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*(SIR_BOF_TYPE *)(irPacketBuf+totalBytes) = SIR_BOF;
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totalBytes += SIR_BOF_SIZE;
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fcs = 0xffff;
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// Fill TX buff w/ I data & calculate FCS as we go
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for (i=0; i<ndisPacketLen; i++) {
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ASSERT(bufData);
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nextChar = *bufData++;
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fcs = (fcs >> 8) ^ fcsTable[(fcs ^ nextChar) & 0xff];
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totalBytes += EscapeSlowIrData(&irPacketBuf[totalBytes], nextChar);
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if (--bufLen==0) {
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NdisGetNextBuffer(ndisBuf, &ndisBuf);
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if (ndisBuf) {
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// NDIS requriement
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// NdisQueryBuffer(ndisBuf, (PVOID *)&bufData, &bufLen);
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NdisQueryBufferSafe(ndisBuf, (PVOID *)&bufData, &bufLen,16);
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}
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else {
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bufData = NULL;
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}
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}
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}
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if (bufData != NULL) {
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// Packet was corrupt -- it misreported its size.
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// DBGERR(("Packet corrupt in NdisToIrPacket (buffer lengths don't add up to packet length)."));
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*irPacketLen = 0;
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return (FALSE);
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}
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fcs = ~fcs;
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// Put in the 16-bit FCS
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totalBytes += EscapeSlowIrData(&irPacketBuf[totalBytes], (UCHAR)(fcs&0xff));
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totalBytes += EscapeSlowIrData(&irPacketBuf[totalBytes], (UCHAR)(fcs>>8));
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// EOF
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*(SIR_EOF_TYPE *)&irPacketBuf[totalBytes] = SIR_EOF;
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totalBytes += SIR_EOF_SIZE;
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*irPacketLen = totalBytes;
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// DBGOUT(("... NdisToIrPacket converted %d-byte ndis pkt to %d-byte irda pkt:", ndisPacketLen, *irPacketLen));
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return (TRUE);
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}
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//----------------------------------------------------------------------
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// Procedure: [ComputeSirFCS]
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//
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//----------------------------------------------------------------------
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USHORT ComputeSirFCS(UCHAR *data, UINT dataLen)
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{
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USHORT fcs = 0xffff;
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UINT i;
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// DBGOUT(("ComputeSirFCS() on %d-byte buffer.", dataLen));
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for (i = 0; i < dataLen; i++){
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fcs = (fcs >> 8) ^ fcsTable[(fcs ^ *data++) & 0xff];
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}
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fcs = ~fcs;
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// DBGOUT(("ComputeFCS returning %d=0x%x.", (UINT)fcs, (UINT)fcs));
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return (fcs);
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}
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//-----------------------------------------------------------------------------
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// Procedure: [ProcRXSir]
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//
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//-----------------------------------------------------------------------------
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BOOLEAN ProcRXSir(UCHAR *dBuff, UINT dCnt)
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{
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USHORT fcs;
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// FCS is not computed over the FCS field. Need to look into this.
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// (It seems when the original FCS is included in the calculation,
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// we should get GOOD_FCS for result.)
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fcs = ComputeSirFCS(dBuff, dCnt);
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if (fcs != GOOD_FCS)
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return (FALSE);
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return (TRUE);
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}
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