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/*++
Copyright (c) 2006, 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"
EFI_STATUS
pxe_nvdata_read (
IN SNP_DRIVER *snp,
IN UINTN RegOffset,
IN UINTN NumBytes,
IN OUT VOID *BufferPtr
)
/*++
Routine Description:
This routine calls Undi to read the desired number of eeprom bytes.
Arguments:
snp - pointer to the snp driver structure
RegOffset - eeprom register value relative to the base address
NumBytes - number of bytes to read
BufferPtr - pointer where to read into
Returns:
--*/
{
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;
}
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
)
/*++
Routine Description:
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
Arguments:
this - context pointer
ReadOrWrite - true for reading and false for writing
RegOffset - eeprom register relative to the base
NumBytes - how many bytes to read
BufferPtr - address of memory to read into
Returns:
--*/
{
SNP_DRIVER *snp;
//
// Get pointer to SNP driver instance for *this.
//
if (this == NULL) {
return EFI_INVALID_PARAMETER;
}
snp = EFI_SIMPLE_NETWORK_DEV_FROM_THIS (this);
if (snp == NULL) {
return EFI_DEVICE_ERROR;
}
//
// Return error if the SNP is not initialized.
//
switch (snp->mode.State) {
case EfiSimpleNetworkInitialized:
break;
case EfiSimpleNetworkStopped:
return EFI_NOT_STARTED;
case EfiSimpleNetworkStarted:
return EFI_DEVICE_ERROR;
default:
return EFI_DEVICE_ERROR;
}
//
// Return error if non-volatile memory variables are not valid.
//
if (snp->mode.NvRamSize == 0 || snp->mode.NvRamAccessSize == 0) {
return EFI_UNSUPPORTED;
}
//
// 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)
) {
return EFI_INVALID_PARAMETER;
}
//
// check the implementation flags of undi if we can write the nvdata!
//
if (!ReadOrWrite) {
return EFI_UNSUPPORTED;
} else {
return pxe_nvdata_read (snp, RegOffset, NumBytes, BufferPtr);
}
}
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