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/** @file
Copyright (c) 2004 - 2007, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
Module name:
nvdata.c
Abstract:
Revision history:
2000-Feb-03 M(f)J Genesis.
**/
#include "Snp.h"
/**
This routine calls Undi to read the desired number of eeprom bytes.
@param snp pointer to the snp driver structure
@param RegOffset eeprom register value relative to the base address
@param NumBytes number of bytes to read
@param BufferPtr pointer where to read into
**/
EFI_STATUS
pxe_nvdata_read (
IN SNP_DRIVER *snp,
IN UINTN RegOffset,
IN UINTN NumBytes,
IN OUT VOID *BufferPtr
)
{
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 = 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->if_num;
snp->cdb.Control = PXE_CONTROL_LAST_CDB_IN_LIST;
//
// Issue UNDI command and check result.
//
DEBUG ((EFI_D_NET, "\nsnp->undi.nvdata () "));
(*snp->issue_undi32_command) ((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;
}
CopyMem (BufferPtr, db->Data.Byte + RegOffset, NumBytes);
return EFI_SUCCESS;
}
/**
This is an interface call provided by SNP.
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 context pointer
@param ReadOrWrite true for reading and false for writing
@param RegOffset eeprom register relative to the base
@param NumBytes how many bytes to read
@param BufferPtr address of memory to read into
**/
EFI_STATUS
EFIAPI
snp_undi32_nvdata (
IN EFI_SIMPLE_NETWORK_PROTOCOL *this,
IN BOOLEAN ReadOrWrite,
IN UINTN RegOffset,
IN UINTN NumBytes,
IN OUT VOID *BufferPtr
)
{
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 ((NumBytes == 0) ||
(BufferPtr == NULL) ||
(RegOffset >= snp->mode.NvRamSize) ||
(RegOffset + NumBytes > snp->mode.NvRamSize) ||
(NumBytes % snp->mode.NvRamAccessSize != 0) ||
(RegOffset % snp->mode.NvRamAccessSize != 0)
) {
Status = EFI_INVALID_PARAMETER;
goto ON_EXIT;
}
//
// check the implementation flags of undi if we can write the nvdata!
//
if (!ReadOrWrite) {
Status = EFI_UNSUPPORTED;
} else {
Status = pxe_nvdata_read (snp, RegOffset, NumBytes, BufferPtr);
}
ON_EXIT:
gBS->RestoreTPL (OldTpl);
return Status;
}
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