如何"CreateChild()".UEFI

Question

我想知道，我如何访问TCP4Protocol在我的DXE驱动程序中使用。我已经问过类似的问题：myFirstQestion

现在我找不到解决这个错误的方法。

因为在尝试加载驱动程序时，我得到了调试字符串"Can't create child“。选择下面的代码。

也许有人知道如何通过dxe驱动程序从链接中完成我的任务。

谢谢。

#include "Uefi.h"
#include <Protocol/Tcp4.h>
#include <Library/UefiDriverEntryPoint.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Protocol/ServiceBinding.h>
#include <Protocol/SimpleNetwork.h>
#include <Library/DebugLib.h>


EFI_STATUS
EFIAPI
Net1DriverDxeEntry(IN EFI_HANDLE ImageHandle, IN EFI_SYSTEM_TABLE *SystemTable)
{
    EFI_TCP4_PROTOCOL               *TCP4protocol = NULL;
    EFI_SERVICE_BINDING_PROTOCOL    *TCP4ServiceBinding = NULL;
    EFI_SIMPLE_NETWORK_PROTOCOL     *SimpleNetworkProtocol = NULL;
    EFI_HANDLE                      *HandleBuffer = NULL;
    EFI_HANDLE                      *TCP4Handle = NULL;
    UINTN                            HandleCount;
    UINTN                            i;
    CHAR16                          *Deb1 = L"Simple network protocol not found\r\n";
    CHAR16                          *Deb2 = L"TCP4 protocol not found\r\n";
    CHAR16                          *Deb3 = L"Can't create child\r\n";
    CHAR16                          *Deb4 = L"Can't handle protocol\n\r\n";





    EFI_STATUS Status = gBS->LocateProtocol(&gEfiSimpleNetworkProtocolGuid,NULL, (VOID**) &SimpleNetworkProtocol);

    if (EFI_ERROR (Status)) 
    {
        DEBUG((-1, "ShowStatus: Simple network protocol not found\n"));
        gST->ConOut->OutputString(gST->ConOut, Deb1);
        return EFI_UNSUPPORTED;
    }

    Status = gBS->LocateHandleBuffer(ByProtocol,&gEfiTcp4ProtocolGuid, NULL, &HandleCount,&HandleBuffer);
    if (EFI_ERROR (Status)) 
    {
        gST->ConOut->OutputString(gST->ConOut, Deb2);
        DEBUG((-2, "ShowStatus: TCP4 protocol not found\n"));
        return EFI_UNSUPPORTED;
    }

    for (i = 0; i < HandleCount; i ++) 
    {
        Status = gBS->HandleProtocol(HandleBuffer[i], &gEfiTcp4ServiceBindingProtocolGuid,(VOID **) &TCP4ServiceBinding);
        if(EFI_ERROR (Status))
        {
        DEBUG((-3, "\n"));
        gST->ConOut->OutputString(gST->ConOut, Deb3);
        return EFI_UNSUPPORTED;
        }

        TCP4ServiceBinding->CreateChild(TCP4ServiceBinding, TCP4Handle);


        Status = gBS->HandleProtocol(TCP4Handle,&gEfiTcp4ProtocolGuid,(VOID **) &TCP4protocol);
        if(EFI_ERROR (Status))
        {
        gST->ConOut->OutputString(gST->ConOut, Deb4);
        DEBUG((-4, "ShowStatus: Can't handle protocol\n"));
        return EFI_UNSUPPORTED;
        }
    }

return EFI_SUCCESS;
}

Answer 1

TCP4Handle的类型应为EFI_HANDLE，而不是EFI_HANDLE*。

EFI_HANDLE                      TCP4Handle = NULL;
//....
TCP4ServiceBinding->CreateChild(TCP4ServiceBinding, &TCP4Handle);

而且您必须查找gEfiTcp4ServiceBindingProtocolGuid，而不是gEfiTcp4ProtocolGuid。

Status = gBS->LocateHandleBuffer(ByProtocol,&gEfiTcp4ServiceBindingProtocolGuid, NULL, &HandleCount,&HandleBuffer);