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/** @file
Implementation of reading and writing operations on the NVRAM device
attached to a network interface.
Copyright (c) 2004 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "Snp.h"
/**
This routine calls Undi to read the desired number of eeprom bytes.
@param Snp pointer to the snp driver structure
@param Offset eeprom register value relative to the base address
@param BufferSize number of bytes to read
@param Buffer pointer where to read into
@retval EFI_SUCCESS The NVRAM access was performed.
@retval EFI_INVALID_PARAMETER Invalid UNDI command.
@retval EFI_UNSUPPORTED Command is not supported by UNDI.
@retval EFI_DEVICE_ERROR Fail to execute UNDI command.
**/
EFI_STATUS
PxeNvDataRead (
IN SNP_DRIVER *Snp,
IN UINTN Offset,
IN UINTN BufferSize,
IN OUT VOID *Buffer
)
{
PXE_DB_NVDATA *Db;
Db = Snp->Db;
Snp->Cdb.OpCode = PXE_OPCODE_NVDATA;
Snp->Cdb.OpFlags = PXE_OPFLAGS_NVDATA_READ;
Snp->Cdb.CPBsize = PXE_CPBSIZE_NOT_USED;
Snp->Cdb.CPBaddr = PXE_CPBADDR_NOT_USED;
Snp->Cdb.DBsize = (UINT16) sizeof (PXE_DB_NVDATA);
Snp->Cdb.DBaddr = (UINT64)(UINTN) Db;
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;
//
// Issue UNDI command and check result.
//
DEBUG ((EFI_D_NET, "\nsnp->undi.nvdata () "));
(*Snp->IssueUndi32Command) ((UINT64)(UINTN) &Snp->Cdb);
switch (Snp->Cdb.StatCode) {
case PXE_STATCODE_SUCCESS:
break;
case PXE_STATCODE_UNSUPPORTED:
DEBUG (
(EFI_D_NET,
"\nsnp->undi.nvdata() %xh:%xh\n",
Snp->Cdb.StatFlags,
Snp->Cdb.StatCode)
);
return EFI_UNSUPPORTED;
default:
DEBUG (
(EFI_D_NET,
"\nsnp->undi.nvdata() %xh:%xh\n",
Snp->Cdb.StatFlags,
Snp->Cdb.StatCode)
);
return EFI_DEVICE_ERROR;
}
ASSERT (Offset < sizeof (Db->Data));
CopyMem (Buffer, &Db->Data.Byte[Offset], BufferSize);
return EFI_SUCCESS;
}
/**
Performs read and write operations on the NVRAM device attached to a network
interface.
This function performs read and write operations on the NVRAM device attached
to a network interface. If ReadWrite is TRUE, a read operation is performed.
If ReadWrite is FALSE, a write operation is performed. Offset specifies the
byte offset at which to start either operation. Offset must be a multiple of
NvRamAccessSize , and it must have a value between zero and NvRamSize.
BufferSize specifies the length of the read or write operation. BufferSize must
also be a multiple of NvRamAccessSize, and Offset + BufferSize must not exceed
NvRamSize.
If any of the above conditions is not met, then EFI_INVALID_PARAMETER will be
returned.
If all the conditions are met and the operation is "read," the NVRAM device
attached to the network interface will be read into Buffer and EFI_SUCCESS
will be returned. If this is a write operation, the contents of Buffer will be
used to update the contents of the NVRAM device attached to the network
interface and EFI_SUCCESS will be returned.
It does the basic checking on the input parameters and retrieves snp structure
and then calls the read_nvdata() call which does the actual reading
@param This A pointer to the EFI_SIMPLE_NETWORK_PROTOCOL instance.
@param ReadWrite TRUE for read operations, FALSE for write operations.
@param Offset Byte offset in the NVRAM device at which to start the read or
write operation. This must be a multiple of NvRamAccessSize
and less than NvRamSize. (See EFI_SIMPLE_NETWORK_MODE)
@param BufferSize The number of bytes to read or write from the NVRAM device.
This must also be a multiple of NvramAccessSize.
@param Buffer A pointer to the data buffer.
@retval EFI_SUCCESS The NVRAM access was performed.
@retval EFI_NOT_STARTED The network interface has not been started.
@retval EFI_INVALID_PARAMETER One or more of the following conditions is TRUE:
* The This parameter is NULL
* The This parameter does not point to a valid
EFI_SIMPLE_NETWORK_PROTOCOL structure
* The Offset parameter is not a multiple of
EFI_SIMPLE_NETWORK_MODE.NvRamAccessSize
* The Offset parameter is not less than
EFI_SIMPLE_NETWORK_MODE.NvRamSize
* The BufferSize parameter is not a multiple of
EFI_SIMPLE_NETWORK_MODE.NvRamAccessSize
* The Buffer parameter is NULL
@retval EFI_DEVICE_ERROR The command could not be sent to the network
interface.
@retval EFI_UNSUPPORTED This function is not supported by the network
interface.
**/
EFI_STATUS
EFIAPI
SnpUndi32NvData (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
IN BOOLEAN ReadWrite,
IN UINTN Offset,
IN UINTN BufferSize,
IN OUT VOID *Buffer
)
{
SNP_DRIVER *Snp;
EFI_TPL OldTpl;
EFI_STATUS Status;
//
// Get pointer to SNP driver instance for *this.
//
if (This == NULL) {
return EFI_INVALID_PARAMETER;
}
Snp = EFI_SIMPLE_NETWORK_DEV_FROM_THIS (This);
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
//
// Return error if the SNP is not initialized.
//
switch (Snp->Mode.State) {
case EfiSimpleNetworkInitialized:
break;
case EfiSimpleNetworkStopped:
Status = EFI_NOT_STARTED;
goto ON_EXIT;
default:
Status = EFI_DEVICE_ERROR;
goto ON_EXIT;
}
//
// Return error if non-volatile memory variables are not valid.
//
if (Snp->Mode.NvRamSize == 0 || Snp->Mode.NvRamAccessSize == 0) {
Status = EFI_UNSUPPORTED;
goto ON_EXIT;
}
//
// Check for invalid parameter combinations.
//
if ((BufferSize == 0) ||
(Buffer == NULL) ||
(Offset >= Snp->Mode.NvRamSize) ||
(Offset + BufferSize > Snp->Mode.NvRamSize) ||
(BufferSize % Snp->Mode.NvRamAccessSize != 0) ||
(Offset % Snp->Mode.NvRamAccessSize != 0)
) {
Status = EFI_INVALID_PARAMETER;
goto ON_EXIT;
}
//
// check the implementation flags of undi if we can write the nvdata!
//
if (!ReadWrite) {
Status = EFI_UNSUPPORTED;
} else {
Status = PxeNvDataRead (Snp, Offset, BufferSize, Buffer);
}
ON_EXIT:
gBS->RestoreTPL (OldTpl);
return Status;
}
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