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CloverBootloader/NetworkPkg/SnpDxe/Snp.c

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/** @file
Implementation of driver entry point and driver binding protocol.
Copyright (c) 2004 - 2019, Intel Corporation. All rights reserved.<BR>
Copyright (c) Microsoft Corporation.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "Snp.h"
/**
One notified function to stop UNDI device when gBS->ExitBootServices() called.
@param Event Pointer to this event
@param Context Event handler private data
**/
VOID
EFIAPI
SnpNotifyExitBootServices (
EFI_EVENT Event,
VOID *Context
)
{
SNP_DRIVER *Snp;
Snp = (SNP_DRIVER *)Context;
//
// Shutdown and stop UNDI driver
//
PxeShutdown (Snp);
PxeStop (Snp);
}
/**
Send command to UNDI. It does nothing currently.
@param Cdb command to be sent to UNDI.
@retval EFI_INVALID_PARAMETER The command is 0.
@retval EFI_UNSUPPORTED Default return status because it's not
supported currently.
**/
EFI_STATUS
EFIAPI
IssueHwUndiCommand (
UINT64 Cdb
)
{
DEBUG ((DEBUG_ERROR, "\nIssueHwUndiCommand() - This should not be called!"));
if (Cdb == 0) {
return EFI_INVALID_PARAMETER;
}
//
// %%TBD - For now, nothing is done.
//
return EFI_UNSUPPORTED;
}
/**
Compute 8-bit checksum of a buffer.
@param Buffer Pointer to buffer.
@param Length Length of buffer in bytes.
@return 8-bit checksum of all bytes in buffer, or zero if ptr is NULL or len
is zero.
**/
UINT8
Calc8BitCksum (
VOID *Buffer,
UINTN Length
)
{
UINT8 *Ptr;
UINT8 Cksum;
Ptr = Buffer;
Cksum = 0;
if ((Ptr == NULL) || (Length == 0)) {
return 0;
}
while (Length-- != 0) {
Cksum = (UINT8)(Cksum + *Ptr++);
}
return Cksum;
}
/**
Test to see if this driver supports ControllerHandle. This service
is called by the EFI boot service ConnectController(). In
order to make drivers as small as possible, there are a few calling
restrictions for this service. ConnectController() must
follow these calling restrictions. If any other agent wishes to call
Supported() it must also follow these calling restrictions.
@param This Protocol instance pointer.
@param ControllerHandle Handle of device to test.
@param RemainingDevicePath Optional parameter use to pick a specific child
device to start.
@retval EFI_SUCCESS This driver supports this device.
@retval EFI_ALREADY_STARTED This driver is already running on this device.
@retval other This driver does not support this device.
**/
EFI_STATUS
EFIAPI
SimpleNetworkDriverSupported (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE Controller,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
)
{
EFI_STATUS Status;
EFI_NETWORK_INTERFACE_IDENTIFIER_PROTOCOL *NiiProtocol;
PXE_UNDI *Pxe;
Status = gBS->OpenProtocol (
Controller,
&gEfiDevicePathProtocolGuid,
NULL,
This->DriverBindingHandle,
Controller,
EFI_OPEN_PROTOCOL_TEST_PROTOCOL
);
if (EFI_ERROR (Status)) {
return Status;
}
Status = gBS->OpenProtocol (
Controller,
&gEfiNetworkInterfaceIdentifierProtocolGuid_31,
(VOID **)&NiiProtocol,
This->DriverBindingHandle,
Controller,
EFI_OPEN_PROTOCOL_BY_DRIVER
);
if (EFI_ERROR (Status)) {
if (Status == EFI_ALREADY_STARTED) {
DEBUG ((DEBUG_INFO, "Support(): Already Started. on handle %p\n", Controller));
}
return Status;
}
DEBUG ((DEBUG_INFO, "Support(): UNDI3.1 found on handle %p\n", Controller));
//
// check the version, we don't want to connect to the undi16
//
if (NiiProtocol->Type != EfiNetworkInterfaceUndi) {
Status = EFI_UNSUPPORTED;
goto Done;
}
//
// Check to see if !PXE structure is valid. Paragraph alignment of !PXE structure is required.
//
if ((NiiProtocol->Id & 0x0F) != 0) {
DEBUG ((DEBUG_NET, "\n!PXE structure is not paragraph aligned.\n"));
Status = EFI_UNSUPPORTED;
goto Done;
}
Pxe = (PXE_UNDI *)(UINTN)(NiiProtocol->Id);
//
// Verify !PXE revisions.
//
if (Pxe->hw.Signature != PXE_ROMID_SIGNATURE) {
DEBUG ((DEBUG_NET, "\n!PXE signature is not valid.\n"));
Status = EFI_UNSUPPORTED;
goto Done;
}
if (Pxe->hw.Rev < PXE_ROMID_REV) {
DEBUG ((DEBUG_NET, "\n!PXE.Rev is not supported.\n"));
Status = EFI_UNSUPPORTED;
goto Done;
}
if (Pxe->hw.MajorVer < PXE_ROMID_MAJORVER) {
DEBUG ((DEBUG_NET, "\n!PXE.MajorVer is not supported.\n"));
Status = EFI_UNSUPPORTED;
goto Done;
} else if ((Pxe->hw.MajorVer == PXE_ROMID_MAJORVER) && (Pxe->hw.MinorVer < PXE_ROMID_MINORVER)) {
DEBUG ((DEBUG_NET, "\n!PXE.MinorVer is not supported."));
Status = EFI_UNSUPPORTED;
goto Done;
}
//
// Do S/W UNDI specific checks.
//
if ((Pxe->hw.Implementation & PXE_ROMID_IMP_HW_UNDI) == 0) {
if (Pxe->sw.EntryPoint < Pxe->sw.Len) {
DEBUG ((DEBUG_NET, "\n!PXE S/W entry point is not valid."));
Status = EFI_UNSUPPORTED;
goto Done;
}
if (Pxe->sw.BusCnt == 0) {
DEBUG ((DEBUG_NET, "\n!PXE.BusCnt is zero."));
Status = EFI_UNSUPPORTED;
goto Done;
}
}
Status = EFI_SUCCESS;
DEBUG ((DEBUG_INFO, "Support(): supported on %p\n", Controller));
Done:
gBS->CloseProtocol (
Controller,
&gEfiNetworkInterfaceIdentifierProtocolGuid_31,
This->DriverBindingHandle,
Controller
);
return Status;
}
/**
Start this driver on ControllerHandle. This service is called by the
EFI boot service ConnectController(). In order to make
drivers as small as possible, there are a few calling restrictions for
this service. ConnectController() must follow these
calling restrictions. If any other agent wishes to call Start() it
must also follow these calling restrictions.
@param This Protocol instance pointer.
@param ControllerHandle Handle of device to bind driver to.
@param RemainingDevicePath Optional parameter use to pick a specific child
device to start.
@retval EFI_SUCCESS This driver is added to ControllerHandle
@retval EFI_DEVICE_ERROR This driver could not be started due to a device error
@retval other This driver does not support this device
**/
EFI_STATUS
EFIAPI
SimpleNetworkDriverStart (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE Controller,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
)
{
EFI_NETWORK_INTERFACE_IDENTIFIER_PROTOCOL *Nii;
EFI_DEVICE_PATH_PROTOCOL *NiiDevicePath;
EFI_STATUS Status;
PXE_UNDI *Pxe;
SNP_DRIVER *Snp;
VOID *Address;
EFI_HANDLE Handle;
UINT8 BarIndex;
PXE_STATFLAGS InitStatFlags;
EFI_PCI_IO_PROTOCOL *PciIo;
EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *BarDesc;
BOOLEAN FoundIoBar;
BOOLEAN FoundMemoryBar;
DEBUG ((DEBUG_NET, "\nSnpNotifyNetworkInterfaceIdentifier() "));
Status = gBS->OpenProtocol (
Controller,
&gEfiDevicePathProtocolGuid,
(VOID **)&NiiDevicePath,
This->DriverBindingHandle,
Controller,
EFI_OPEN_PROTOCOL_BY_DRIVER
);
if (EFI_ERROR (Status)) {
return Status;
}
Status = gBS->LocateDevicePath (
&gEfiPciIoProtocolGuid,
&NiiDevicePath,
&Handle
);
if (EFI_ERROR (Status)) {
return Status;
}
Status = gBS->OpenProtocol (
Handle,
&gEfiPciIoProtocolGuid,
(VOID **)&PciIo,
This->DriverBindingHandle,
Controller,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Get the NII interface.
//
Status = gBS->OpenProtocol (
Controller,
&gEfiNetworkInterfaceIdentifierProtocolGuid_31,
(VOID **)&Nii,
This->DriverBindingHandle,
Controller,
EFI_OPEN_PROTOCOL_BY_DRIVER
);
if (EFI_ERROR (Status)) {
gBS->CloseProtocol (
Controller,
&gEfiDevicePathProtocolGuid,
This->DriverBindingHandle,
Controller
);
return Status;
}
DEBUG ((DEBUG_INFO, "Start(): UNDI3.1 found\n"));
Pxe = (PXE_UNDI *)(UINTN)(Nii->Id);
if (Calc8BitCksum (Pxe, Pxe->hw.Len) != 0) {
DEBUG ((DEBUG_NET, "\n!PXE checksum is not correct.\n"));
goto NiiError;
}
if ((Pxe->hw.Implementation & PXE_ROMID_IMP_PROMISCUOUS_RX_SUPPORTED) != 0) {
//
// We can get any packets.
//
} else if ((Pxe->hw.Implementation & PXE_ROMID_IMP_BROADCAST_RX_SUPPORTED) != 0) {
//
// We need to be able to get broadcast packets for DHCP.
// If we do not have promiscuous support, we must at least have
// broadcast support or we cannot do DHCP!
//
} else {
DEBUG ((DEBUG_NET, "\nUNDI does not have promiscuous or broadcast support."));
goto NiiError;
}
//
// OK, we like this UNDI, and we know snp is not already there on this handle
// Allocate and initialize a new simple network protocol structure.
//
Status = PciIo->AllocateBuffer (
PciIo,
AllocateAnyPages,
EfiBootServicesData,
SNP_MEM_PAGES (sizeof (SNP_DRIVER)),
&Address,
0
);
if (Status != EFI_SUCCESS) {
DEBUG ((DEBUG_NET, "\nCould not allocate SNP_DRIVER structure.\n"));
goto NiiError;
}
Snp = (SNP_DRIVER *)(UINTN)Address;
ZeroMem (Snp, sizeof (SNP_DRIVER));
Snp->PciIo = PciIo;
Snp->Signature = SNP_DRIVER_SIGNATURE;
EfiInitializeLock (&Snp->Lock, TPL_NOTIFY);
Snp->Snp.Revision = EFI_SIMPLE_NETWORK_PROTOCOL_REVISION;
Snp->Snp.Start = SnpUndi32Start;
Snp->Snp.Stop = SnpUndi32Stop;
Snp->Snp.Initialize = SnpUndi32Initialize;
Snp->Snp.Reset = SnpUndi32Reset;
Snp->Snp.Shutdown = SnpUndi32Shutdown;
Snp->Snp.ReceiveFilters = SnpUndi32ReceiveFilters;
Snp->Snp.StationAddress = SnpUndi32StationAddress;
Snp->Snp.Statistics = SnpUndi32Statistics;
Snp->Snp.MCastIpToMac = SnpUndi32McastIpToMac;
Snp->Snp.NvData = SnpUndi32NvData;
Snp->Snp.GetStatus = SnpUndi32GetStatus;
Snp->Snp.Transmit = SnpUndi32Transmit;
Snp->Snp.Receive = SnpUndi32Receive;
Snp->Snp.WaitForPacket = NULL;
Snp->Snp.Mode = &Snp->Mode;
Snp->TxRxBufferSize = 0;
Snp->TxRxBuffer = NULL;
Snp->RecycledTxBuf = AllocatePool (sizeof (UINT64) * SNP_TX_BUFFER_INCREASEMENT);
if (Snp->RecycledTxBuf == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto Error_DeleteSNP;
}
Snp->MaxRecycledTxBuf = SNP_TX_BUFFER_INCREASEMENT;
Snp->RecycledTxBufCount = 0;
if (Nii->Revision >= EFI_NETWORK_INTERFACE_IDENTIFIER_PROTOCOL_REVISION) {
Snp->IfNum = Nii->IfNum;
} else {
Snp->IfNum = (UINT8)(Nii->IfNum & 0xFF);
}
if ((Pxe->hw.Implementation & PXE_ROMID_IMP_HW_UNDI) != 0) {
Snp->IsSwUndi = FALSE;
Snp->IssueUndi32Command = &IssueHwUndiCommand;
} else {
Snp->IsSwUndi = TRUE;
if ((Pxe->sw.Implementation & PXE_ROMID_IMP_SW_VIRT_ADDR) != 0) {
Snp->IssueUndi32Command = (ISSUE_UNDI32_COMMAND)(UINTN)Pxe->sw.EntryPoint;
} else {
Snp->IssueUndi32Command = (ISSUE_UNDI32_COMMAND)(UINTN)((UINT8)(UINTN)Pxe + Pxe->sw.EntryPoint);
}
}
//
// Allocate a global CPB and DB buffer for this UNDI interface.
// we do this because:
//
// -UNDI 3.0 wants all the addresses passed to it (even the cpb and db) to be
// within 2GB limit, create them here and map them so that when undi calls
// v2p callback to check if the physical address is < 2gb, we will pass.
//
// -This is not a requirement for 3.1 or later UNDIs but the code looks
// simpler if we use the same cpb, db variables for both old and new undi
// interfaces from all the SNP interface calls (we don't map the buffers
// for the newer undi interfaces though)
// .
// -it is OK to allocate one global set of CPB, DB pair for each UNDI
// interface as EFI does not multi-task and so SNP will not be re-entered!
//
Status = PciIo->AllocateBuffer (
PciIo,
AllocateAnyPages,
EfiBootServicesData,
SNP_MEM_PAGES (4096),
&Address,
0
);
if (Status != EFI_SUCCESS) {
DEBUG ((DEBUG_NET, "\nCould not allocate CPB and DB structures.\n"));
goto Error_DeleteSNP;
}
Snp->Cpb = (VOID *)(UINTN)Address;
Snp->Db = (VOID *)((UINTN)Address + 2048);
//
// Find the correct BAR to do IO.
//
// Enumerate through the PCI BARs for the device to determine which one is
// the IO BAR. Save the index of the BAR into the adapter info structure.
// for regular 32bit BARs, 0 is memory mapped, 1 is io mapped
//
Snp->MemoryBarIndex = PCI_MAX_BAR;
Snp->IoBarIndex = PCI_MAX_BAR;
FoundMemoryBar = FALSE;
FoundIoBar = FALSE;
for (BarIndex = 0; BarIndex < PCI_MAX_BAR; BarIndex++) {
Status = PciIo->GetBarAttributes (
PciIo,
BarIndex,
NULL,
(VOID **)&BarDesc
);
if (Status == EFI_UNSUPPORTED) {
continue;
} else if (EFI_ERROR (Status)) {
goto Error_DeleteSNP;
}
if ((!FoundMemoryBar) && (BarDesc->ResType == ACPI_ADDRESS_SPACE_TYPE_MEM)) {
Snp->MemoryBarIndex = BarIndex;
FoundMemoryBar = TRUE;
} else if ((!FoundIoBar) && (BarDesc->ResType == ACPI_ADDRESS_SPACE_TYPE_IO)) {
Snp->IoBarIndex = BarIndex;
FoundIoBar = TRUE;
}
FreePool (BarDesc);
if (FoundMemoryBar && FoundIoBar) {
break;
}
}
Status = PxeStart (Snp);
if (Status != EFI_SUCCESS) {
goto Error_DeleteSNP;
}
Snp->Cdb.OpCode = PXE_OPCODE_GET_INIT_INFO;
Snp->Cdb.OpFlags = PXE_OPFLAGS_NOT_USED;
Snp->Cdb.CPBsize = PXE_CPBSIZE_NOT_USED;
Snp->Cdb.CPBaddr = PXE_DBADDR_NOT_USED;
Snp->Cdb.DBsize = (UINT16)sizeof (Snp->InitInfo);
Snp->Cdb.DBaddr = (UINT64)(UINTN)(&Snp->InitInfo);
Snp->Cdb.StatCode = PXE_STATCODE_INITIALIZE;
Snp->Cdb.StatFlags = PXE_STATFLAGS_INITIALIZE;
Snp->Cdb.IFnum = Snp->IfNum;
Snp->Cdb.Control = PXE_CONTROL_LAST_CDB_IN_LIST;
DEBUG ((DEBUG_NET, "\nSnp->undi.get_init_info() "));
(*Snp->IssueUndi32Command)((UINT64)(UINTN)&Snp->Cdb);
//
// Save the INIT Stat Code...
//
InitStatFlags = Snp->Cdb.StatFlags;
if (Snp->Cdb.StatCode != PXE_STATCODE_SUCCESS) {
DEBUG ((DEBUG_NET, "\nSnp->undi.init_info() %xh:%xh\n", Snp->Cdb.StatFlags, Snp->Cdb.StatCode));
PxeStop (Snp);
goto Error_DeleteSNP;
}
//
// Initialize simple network protocol mode structure
//
Snp->Mode.State = EfiSimpleNetworkStopped;
Snp->Mode.HwAddressSize = Snp->InitInfo.HWaddrLen;
Snp->Mode.MediaHeaderSize = Snp->InitInfo.MediaHeaderLen;
Snp->Mode.MaxPacketSize = Snp->InitInfo.FrameDataLen;
Snp->Mode.NvRamAccessSize = Snp->InitInfo.NvWidth;
Snp->Mode.NvRamSize = Snp->InitInfo.NvCount * Snp->Mode.NvRamAccessSize;
Snp->Mode.IfType = Snp->InitInfo.IFtype;
Snp->Mode.MaxMCastFilterCount = Snp->InitInfo.MCastFilterCnt;
Snp->Mode.MCastFilterCount = 0;
switch (InitStatFlags & PXE_STATFLAGS_CABLE_DETECT_MASK) {
case PXE_STATFLAGS_CABLE_DETECT_SUPPORTED:
Snp->CableDetectSupported = TRUE;
break;
case PXE_STATFLAGS_CABLE_DETECT_NOT_SUPPORTED:
default:
Snp->CableDetectSupported = FALSE;
}
switch (InitStatFlags & PXE_STATFLAGS_GET_STATUS_NO_MEDIA_MASK) {
case PXE_STATFLAGS_GET_STATUS_NO_MEDIA_SUPPORTED:
Snp->MediaStatusSupported = TRUE;
break;
case PXE_STATFLAGS_GET_STATUS_NO_MEDIA_NOT_SUPPORTED:
default:
Snp->MediaStatusSupported = FALSE;
}
if (Snp->CableDetectSupported || Snp->MediaStatusSupported) {
Snp->Mode.MediaPresentSupported = TRUE;
}
if ((Pxe->hw.Implementation & PXE_ROMID_IMP_STATION_ADDR_SETTABLE) != 0) {
Snp->Mode.MacAddressChangeable = TRUE;
} else {
Snp->Mode.MacAddressChangeable = FALSE;
}
if ((Pxe->hw.Implementation & PXE_ROMID_IMP_MULTI_FRAME_SUPPORTED) != 0) {
Snp->Mode.MultipleTxSupported = TRUE;
} else {
Snp->Mode.MultipleTxSupported = FALSE;
}
Snp->Mode.ReceiveFilterMask = EFI_SIMPLE_NETWORK_RECEIVE_UNICAST;
if ((Pxe->hw.Implementation & PXE_ROMID_IMP_PROMISCUOUS_MULTICAST_RX_SUPPORTED) != 0) {
Snp->Mode.ReceiveFilterMask |= EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS_MULTICAST;
}
if ((Pxe->hw.Implementation & PXE_ROMID_IMP_PROMISCUOUS_RX_SUPPORTED) != 0) {
Snp->Mode.ReceiveFilterMask |= EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS;
}
if ((Pxe->hw.Implementation & PXE_ROMID_IMP_BROADCAST_RX_SUPPORTED) != 0) {
Snp->Mode.ReceiveFilterMask |= EFI_SIMPLE_NETWORK_RECEIVE_BROADCAST;
}
if ((Pxe->hw.Implementation & PXE_ROMID_IMP_FILTERED_MULTICAST_RX_SUPPORTED) != 0) {
Snp->Mode.ReceiveFilterMask |= EFI_SIMPLE_NETWORK_RECEIVE_MULTICAST;
}
if ((Pxe->hw.Implementation & PXE_ROMID_IMP_PROMISCUOUS_MULTICAST_RX_SUPPORTED) != 0) {
Snp->Mode.ReceiveFilterMask |= EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS_MULTICAST;
}
Snp->Mode.ReceiveFilterSetting = 0;
//
// need to get the station address to save in the mode structure. we need to
// initialize the UNDI first for this.
//
Snp->TxRxBufferSize = Snp->InitInfo.MemoryRequired;
Status = PxeInit (Snp, PXE_OPFLAGS_INITIALIZE_DO_NOT_DETECT_CABLE);
if (EFI_ERROR (Status)) {
PxeStop (Snp);
goto Error_DeleteSNP;
}
Status = PxeGetStnAddr (Snp);
if (Status != EFI_SUCCESS) {
DEBUG ((DEBUG_ERROR, "\nSnp->undi.get_station_addr() failed.\n"));
PxeShutdown (Snp);
PxeStop (Snp);
goto Error_DeleteSNP;
}
Snp->Mode.MediaPresent = FALSE;
//
// We should not leave UNDI started and initialized here. this DriverStart()
// routine must only find and attach the SNP interface to UNDI layer that it
// finds on the given handle!
// The UNDI layer will be started when upper layers call Snp->start.
// How ever, this DriverStart() must fill up the snp mode structure which
// contains the MAC address of the NIC. For this reason we started and
// initialized UNDI here, now we are done, do a shutdown and stop of the
// UNDI interface!
//
PxeShutdown (Snp);
PxeStop (Snp);
if (PcdGetBool (PcdSnpCreateExitBootServicesEvent)) {
//
// Create EXIT_BOOT_SERIVES Event
//
Status = gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
TPL_CALLBACK,
SnpNotifyExitBootServices,
Snp,
&gEfiEventExitBootServicesGuid,
&Snp->ExitBootServicesEvent
);
if (EFI_ERROR (Status)) {
goto Error_DeleteSNP;
}
}
//
// add SNP to the undi handle
//
Status = gBS->InstallProtocolInterface (
&Controller,
&gEfiSimpleNetworkProtocolGuid,
EFI_NATIVE_INTERFACE,
&(Snp->Snp)
);
if (!EFI_ERROR (Status)) {
return Status;
}
PciIo->FreeBuffer (
PciIo,
SNP_MEM_PAGES (4096),
Snp->Cpb
);
Error_DeleteSNP:
if (Snp->RecycledTxBuf != NULL) {
FreePool (Snp->RecycledTxBuf);
}
PciIo->FreeBuffer (
PciIo,
SNP_MEM_PAGES (sizeof (SNP_DRIVER)),
Snp
);
NiiError:
gBS->CloseProtocol (
Controller,
&gEfiNetworkInterfaceIdentifierProtocolGuid_31,
This->DriverBindingHandle,
Controller
);
gBS->CloseProtocol (
Controller,
&gEfiDevicePathProtocolGuid,
This->DriverBindingHandle,
Controller
);
//
// If we got here that means we are in error state.
//
if (!EFI_ERROR (Status)) {
Status = EFI_DEVICE_ERROR;
}
return Status;
}
/**
Stop this driver on ControllerHandle. This service is called by the
EFI boot service DisconnectController(). In order to
make drivers as small as possible, there are a few calling
restrictions for this service. DisconnectController()
must follow these calling restrictions. If any other agent wishes
to call Stop() it must also follow these calling restrictions.
@param This Protocol instance pointer.
@param ControllerHandle Handle of device to stop driver on
@param NumberOfChildren Number of Handles in ChildHandleBuffer. If number of
children is zero stop the entire bus driver.
@param ChildHandleBuffer List of Child Handles to Stop.
@retval EFI_SUCCESS This driver is removed ControllerHandle
@retval other This driver was not removed from this device
**/
EFI_STATUS
EFIAPI
SimpleNetworkDriverStop (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE Controller,
IN UINTN NumberOfChildren,
IN EFI_HANDLE *ChildHandleBuffer
)
{
EFI_STATUS Status;
EFI_SIMPLE_NETWORK_PROTOCOL *SnpProtocol;
SNP_DRIVER *Snp;
EFI_PCI_IO_PROTOCOL *PciIo;
//
// Get our context back.
//
Status = gBS->OpenProtocol (
Controller,
&gEfiSimpleNetworkProtocolGuid,
(VOID **)&SnpProtocol,
This->DriverBindingHandle,
Controller,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if (EFI_ERROR (Status)) {
return EFI_UNSUPPORTED;
}
Snp = EFI_SIMPLE_NETWORK_DEV_FROM_THIS (SnpProtocol);
Status = gBS->UninstallProtocolInterface (
Controller,
&gEfiSimpleNetworkProtocolGuid,
&Snp->Snp
);
if (EFI_ERROR (Status)) {
return Status;
}
if (PcdGetBool (PcdSnpCreateExitBootServicesEvent)) {
//
// Close EXIT_BOOT_SERVICES Event
//
gBS->CloseEvent (Snp->ExitBootServicesEvent);
}
Status = gBS->CloseProtocol (
Controller,
&gEfiNetworkInterfaceIdentifierProtocolGuid_31,
This->DriverBindingHandle,
Controller
);
Status = gBS->CloseProtocol (
Controller,
&gEfiDevicePathProtocolGuid,
This->DriverBindingHandle,
Controller
);
PxeShutdown (Snp);
PxeStop (Snp);
FreePool (Snp->RecycledTxBuf);
PciIo = Snp->PciIo;
PciIo->FreeBuffer (
PciIo,
SNP_MEM_PAGES (4096),
Snp->Cpb
);
PciIo->FreeBuffer (
PciIo,
SNP_MEM_PAGES (sizeof (SNP_DRIVER)),
Snp
);
return Status;
}
//
// Simple Network Protocol Driver Global Variables
//
EFI_DRIVER_BINDING_PROTOCOL gSimpleNetworkDriverBinding = {
SimpleNetworkDriverSupported,
SimpleNetworkDriverStart,
SimpleNetworkDriverStop,
0xa,
NULL,
NULL
};
/**
The SNP driver entry point.
@param ImageHandle The driver image handle.
@param SystemTable The system table.
@retval EFI_SUCCESS Initialization routine has found UNDI hardware,
loaded it's ROM, and installed a notify event for
the Network Identifier Interface Protocol
successfully.
@retval Other Return value from HandleProtocol for
DeviceIoProtocol or LoadedImageProtocol
**/
EFI_STATUS
EFIAPI
InitializeSnpNiiDriver (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
return EfiLibInstallDriverBindingComponentName2 (
ImageHandle,
SystemTable,
&gSimpleNetworkDriverBinding,
ImageHandle,
&gSimpleNetworkComponentName,
&gSimpleNetworkComponentName2
);
}
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