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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/import/generic/memory/lib/spd/spd_field.H $ */
/* */
/* OpenPOWER HostBoot Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2018 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* IBM_PROLOG_END_TAG */
///
/// @file spd_field.H
/// @brief SPD data fields
///
// *HWP HWP Owner: Andre Marin <aamarin@us.ibm.com>
// *HWP HWP Backup: Stephen Glancy <sglancy@us.ibm.com>
// *HWP Team: Memory
// *HWP Level: 2
// *HWP Consumed by: HB:FSP
#ifndef _MSS_SPD_FIELD_H_
#define _MSS_SPD_FIELD_H_
#include <cstdint>
#include <generic/memory/lib/utils/shared/mss_generic_consts.H>
namespace mss
{
namespace spd
{
///
/// @class field_t
/// @brief data structure for SPD byte fields
/// @note holds byte index, start bit, and bit length of a decoded field
///
class field_t
{
private:
const size_t iv_byte;
const size_t iv_start;
const size_t iv_length;
public:
// default ctor deleted
field_t() = delete;
///
/// @brief ctor
/// @param[in] i_byte_index
/// @param[in] i_start_bit
/// @param[in] i_bit_length
///
constexpr field_t(const size_t i_byte_index,
const size_t i_start_bit,
const size_t i_bit_length)
: iv_byte(i_byte_index),
iv_start(i_start_bit),
iv_length(i_bit_length)
{}
///
/// @brief default dtor
///
~field_t() = default;
///
/// @brief Byte index getter
/// @return the byte index for this SPD field
///
constexpr size_t get_byte() const
{
return iv_byte;
}
///
/// @brief Starting bit getter
/// @return the starting bit position for this SPD field
///
constexpr size_t get_start() const
{
return iv_start;
}
///
/// @brief bit length getter
/// @return the bit length of this SPD field
///
constexpr size_t get_length() const
{
return iv_length;
}
};// field_t
///
/// @class init_fields
/// @brief Initial fields needed to know how to parse the SPD
/// @note These are preliminary fields that need to be independently
/// decoded from any specific DRAM generation SPEC (e.g. SPD factory)
///
class init_fields
{
private:
enum
{
// Byte 1
REVISION_START = 0,
REVISION_LEN = 8,
// Byte 2
DEVICE_TYPE_START = 0,
DEVICE_TYPE_LEN = 8,
// Byte 3
HYBRID_START = 0,
HYBRID_LEN = 1,
HYBRID_MEDIA_START = 1,
HYBRID_MEDIA_LEN = 3,
BASE_MODULE_START = 4,
BASE_MODULE_LEN = 4,
// Byte 130
REF_RAW_CARD_START = 0,
REF_RAW_CARD_LEN = 8,
};
public:
// 1st field: Byte number
// 2nd field: Start bit
// 3rd field: Bit length
static constexpr field_t REVISION{1, REVISION_START, REVISION_LEN};
static constexpr field_t DEVICE_TYPE{2, DEVICE_TYPE_START, DEVICE_TYPE_LEN};
static constexpr field_t BASE_MODULE{3, BASE_MODULE_START, BASE_MODULE_LEN};
static constexpr field_t HYBRID{3, HYBRID_START, HYBRID_LEN};
static constexpr field_t HYBRID_MEDIA{3, HYBRID_MEDIA_START, HYBRID_MEDIA_LEN};
static constexpr field_t REF_RAW_CARD{130, REF_RAW_CARD_START, REF_RAW_CARD_LEN};
};
///
/// @class fields
/// @brief Collection of SPD fields
/// @tparam D DRAM device type (e.g. DDR4)
/// @tparam S SPD parameter (e.g. RDIMM_MODULE, NVDIMM_MODULE)
///
template <device_type D, parameters S>
class fields;
}// spd
}// mss
#endif // _MSS_SPD_FIELD_H_
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