TI Omap37xx 系列MPU调试 SE4500扫描头2D扫软解记录

<pre name="code" class="cpp">	case SE45_IOCTL_ALLOC_BUFFER:
		if ((pBufOut == NULL) || (dwLenOut < (sizeof(SE45_ALLOC_BUF_REQ) +
								(pDev->dwBufferCount - 1) * sizeof(DWORD))) ||
				(pdwActualOut == NULL))
		{
			dwReturn = ERROR_INVALID_PARAMETER;
			goto BadParameter;
		}
		else
		{
			UINT i, nOutputByteCount;
			PSE45_ALLOC_BUF_REQ pAllocReq;
			HANDLE hCaller;
			PBYTE pVirtAddr;
			//wince5.0.2内核限制，所以必须增加该判断
#if (_WINCEOSVER<600)
			BOOL bOldMode = SetKMode(TRUE);
#endif
			nOutputByteCount = sizeof(SE45_ALLOC_BUF_REQ) + (pDev->dwBufferCount - 1) * sizeof(DWORD);
#if (CE_VERSION == 5)
			//hCaller = GetOwnerProcess();
			//为什么要注释掉上面一行代码，改成下面这行？因为调用的同时，他们应该是同一进程地址空间
			hCaller = GetCurrentProcess();
			pAllocReq = (PSE45_ALLOC_BUF_REQ )MapCallerPtr( pBufOut, nOutputByteCount );
#endif
#if ((CE_VERSION == 6) || (CE_VERSION == 7))
//			hCaller = OpenProcess(0, FALSE, GetCallerVMProcessId());
			hCaller = OpenProcess(0, FALSE, GetDirectCallerProcessId());
			// CE 6 automatically marshals the IOCTL parameters mapCallerPtr() is obsolete
			pAllocReq = (PSE45_ALLOC_BUF_REQ)pBufOut;
#endif
			if (NULL == pAllocReq)
			{
				dwReturn = ERROR_INVALID_PARAMETER;
				goto BadParameter;
			}

			// Reset the user buffers in the low level driver
			camera_reset_buffers(pDev);

			pAllocReq->nNumBuffers = pDev->dwBufferCount;
			pAllocReq->nBufferSize = pDev->dwBufferSize;
			// Save the caller handler
			pDev->dstProcess = hCaller;
			/* return a list of buffer start addresses mapped to caller's process space */
			for (i = 0; i < pDev->dwBufferCount; i++)
			{
				if (camera_get_buffer_addr(pDev, i, &pVirtAddr))
				{
#if (CE_VERSION == 5)
					pAllocReq->ppBuffers[i] = (DWORD )MapPtrToProcess(pVirtAddr, hCaller);
#endif
#if ((CE_VERSION == 6) || (CE_VERSION == 7))
					pAllocReq->ppBuffers[i] = (DWORD)VirtualAllocCopyEx(GetCurrentProcess(), hCaller,
						pVirtAddr, pDev->dwBufferSize, PAGE_READWRITE);
#endif
					// Save it in the driver context for freeing this memory later
					pDev->baseAddr[i] = pAllocReq->ppBuffers[i];
				}
				else
				{
					pVirtAddr = NULL;
					pAllocReq->ppBuffers[i] = (DWORD)NULL;
				}
				DEBUGMSG(ZONE_IOCTL, (TEXT("SE4500 : App:0x%x mapped from Kernel:0x%x\r\n"),pAllocReq->ppBuffers[i], pVirtAddr));
			}
			*pdwActualOut = sizeof(DWORD) * (pDev->dwBufferCount - 1) +
							sizeof(SE45_ALLOC_BUF_REQ);
#if (_WINCEOSVER<600)
		SetKMode(bOldMode);
#endif							
		}
		break;

	case SE45_IOCTL_GET_CURRENT_BUFFER:
		if ((pBufOut == NULL) || (dwLenOut < sizeof(UINT)) ||
				(pdwActualOut == NULL))
		{
			dwReturn = ERROR_INVALID_PARAMETER;
			goto BadParameter;
		}
		else
		{
			//wince5.0.2内核限制，所以必须增加该判断 
#if (_WINCEOSVER<600)
			BOOL bOldMode = SetKMode(TRUE);
#endif
			__try
			{
				if (camera_get_buffer(pDev, (PUINT )pBufOut))
				{
					*pdwActualOut = sizeof(UINT);
				}
				else
				{
					dwReturn = ERROR_NOT_READY;
					goto BadParameter;
				}
			}
			__except(exception_filter(GetExceptionCode(), GetExceptionInformation()))
			{
				DEBUGMSG(ZONE_ERROR, (TEXT("Exception in IOCTL_GET_CURRENT_BUFFER\r\n")));
			}
#if (_WINCEOSVER<600)
		SetKMode(bOldMode);
#endif	
		}