A Simple operation System using S3C2410: middleware/netware/ethernetbuffer.c Source File

00001 /******************************************************
00002 * Function: etherent buffer handler
00003 *
00004 * File:   etherentbuffer.c
00005 * Author: Book Chen
00006 * Date:   2008.07.18
00007 *******************************************************
00008 */
00009 #include "includes.h"
00010 
00011 ETHBUFFER_CONTROL EthBufferCtrl;
00012 ETHBUFFER EthBuffer[ETHBUFFER_NUMBER];
00013 
00014 void F_EthernetBufferInit(void);
00015 void F_EthernetBufferSvc(void);
00016 void F_EthernetBufferReset(ETHBUFFER *pBuffer);
00017 ETHBUFFER *F_EthernetBufferAllocate(void);
00018 void F_EthernetBufferRelease(ETHBUFFER *pBuffer);
00019 INT8U *F_EthernetBufferPut(ETHBUFFER *pBuffer,INT32U Length);
00020 INT8U *F_EthernetBufferPull(ETHBUFFER *pBuffer,INT32U Length);
00021 INT8U *F_EthernetBufferPush(ETHBUFFER *pBuffer,INT32U Length);
00022 void F_EthernetBufferReserve(ETHBUFFER *pBuffer,INT32U Length);
00023 
00024 void F_EthernetBufferInit(void){
00025     EthBufferCtrl.BufferIndex=0; 
00026     EthBufferCtrl.Status=0;     
00027     EthBufferCtrl.State=0;  
00028 }
00029 void F_EthernetBufferSvc(void){}
00030 void F_EthernetBufferReset(ETHBUFFER *pBuffer){
00031     //memset(pBuffer,0,sizeof(ETHBUFFER));
00032     memset(pBuffer,0,5);
00033     pBuffer->Pad[0]=0x00;
00034     pBuffer->Pad[1]=0x00;
00035     pBuffer->TrueSize=ETHERNET_FRAME_LEN; // 1514
00036     pBuffer->pData=pBuffer->Data; 
00037     pBuffer->Length=0;
00038 }
00039 ETHBUFFER *F_EthernetBufferAllocate(void){
00040     ETHBUFFER *pBuffer;
00041     
00042     pBuffer=&EthBuffer[EthBufferCtrl.BufferIndex];
00043     EthBufferCtrl.BufferIndex++;
00044     if(EthBufferCtrl.BufferIndex>=5) EthBufferCtrl.BufferIndex=0;
00045     F_EthernetBufferReset(pBuffer);
00046     return pBuffer;
00047 }
00048 void F_EthernetBufferRelease(ETHBUFFER *pBuffer){}
00049 INT8U *F_EthernetBufferPut(ETHBUFFER *pBuffer,INT32U Length){
00050     pBuffer->Length+=Length;
00051     return pBuffer->pData; 
00052 }
00053 // pull...means add data to frame...frame data pointer pull forward
00054 // pull...means add data to frame...frame data length--
00055 INT8U *F_EthernetBufferPull(ETHBUFFER *pBuffer,INT32U Length){
00056     pBuffer->pData+=Length;
00057     pBuffer->Length-=Length;
00058     return pBuffer->pData; 
00059 }
00060 // push...means add data to frame...frame data pointer push back
00061 // push...means add data to frame...frame data length++
00062 INT8U *F_EthernetBufferPush(ETHBUFFER *pBuffer,INT32U Length){
00063     pBuffer->pData-=Length;    
00064     pBuffer->Length+=Length;   
00065     return pBuffer->pData; 
00066 }
00067 void F_EthernetBufferReserve(ETHBUFFER *pBuffer,INT32U Length){
00068     pBuffer->pData+=Length;
00069 }
00070 void F_EthernetBufferDump(INT8U *pData,INT32U Length){
00071     INT32U i=0,j=0;
00072     
00073     i=0;
00074     j=0;              
00075     myprintf("\n Length=%4x ",Length);
00076     for(i=0;i<Length;i++){
00077         if(j==0) myprintf("\n %4x0h ",(i/16));
00078         #if(DEBUG_ETHERNET_BUFFER)
00079             myprintf("%2x ",*pData);
00080         #endif    
00081         j++;
00082         pData++;
00083         if(j==16) j=0;
00084         //if(i>=0x60) break;
00085     }        
00086     #if(DEBUG_ETHERNET_BUFFER)
00087         myprintf("\n ");
00088     #endif 
00089 }