pldm: Removing default string length

Removing default string length from BIOS json configuration
files.

String BIOS attributes defined in BIOS configuration json file
contains "default_string_lengt

pldm: Removing default string length

Removing default string length from BIOS json configuration
files.

String BIOS attributes defined in BIOS configuration json file
contains "default_string_length". Providing default string length
manually is error prone. As String length can be calculated and
populated easily in the code, removing json support for
default_string_length.

Tested: Power on/off
Gtests passed.

Change-Id: I7604d8ccedd60a39ba07e1df67ff5712f31e7f6e
Signed-off-by: Archana Kakani <archana.kakani@ibm.com>

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libpldmresponder: Improving Logs (lg2)

This commit corrects the severity level of logs and also formats the
message string, fixing the ill-defined message string of the logs as
mentioned in the anti

libpldmresponder: Improving Logs (lg2)

This commit corrects the severity level of logs and also formats the
message string, fixing the ill-defined message string of the logs as
mentioned in the anti-pattern document [1]. Additionally, based on the
requirement this commit adds more debug information to logs.

[1]: https://github.com/openbmc/docs/blob/master/anti-patterns.md#ill-defined-data-structuring-in-lg2-message-strings

Change-Id: I7dc5c308a8cd76573995e07d01d1a6037bca31ba
Signed-off-by: Riya Dixit <riyadixitagra@gmail.com>

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Remove iostream references

With the adoption of LG2 we do not need iostream
prints to the journal. The library was referred but
never used in these cases.

Signed-off-by: Sagar Srinivas <sagar.srini

Remove iostream references

With the adoption of LG2 we do not need iostream
prints to the journal. The library was referred but
never used in these cases.

Signed-off-by: Sagar Srinivas <sagar.srinivas@ibm.com>
Change-Id: I11d3f00284e4f16b63cddb8da2fed14d59672ba1

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PLDM:Catching exception precisely and printing it

Correcting catch block in PLDM repo to print all
exception precisely so pldm trace can be more
useful to identify defect easily.

Change-Id: If2e86d

PLDM:Catching exception precisely and printing it

Correcting catch block in PLDM repo to print all
exception precisely so pldm trace can be more
useful to identify defect easily.

Change-Id: If2e86dcb031ddc2e927e7836d7f4359f5b44cdec
Signed-off-by: Kamalkumar Patel <kamalkumar.patel@ibm.com>

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clang-format: copy latest and re-format

clang-format-16 has some backwards incompatible changes that require
additional settings for best compatibility and re-running the formatter.
Copy the latest

clang-format: copy latest and re-format

clang-format-16 has some backwards incompatible changes that require
additional settings for best compatibility and re-running the formatter.
Copy the latest .clang-format from the docs repository and reformat the
repository.

Change-Id: I61b093f75011417cc9c7acf9605200f4fa429bac
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>

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PLDM: Implementing Phosphor-Logging/LG2 logging

This commit adds changes in PLDM for implementing
structured LG2 logging, thereby moving away from
std::cout/cerr practice of logging which are
output

PLDM: Implementing Phosphor-Logging/LG2 logging

This commit adds changes in PLDM for implementing
structured LG2 logging, thereby moving away from
std::cout/cerr practice of logging which are
output streams and not logging mechanism.

PLDM now can make use of lg2 features like accurate
CODE LINE Number and CODE_FUNCTION Name and better
detailing in json object values which can be used in
log tracking.

More detailed logging change:
https://gist.github.com/riyadixitagra/c251685c1ba84248181891f7bc282395

Tested:
Ran a power off, on, cycle, and reset-reload.

Change-Id: I0485035f15f278c3fd172f0581b053c1c37f3a5b
Signed-off-by: Riya Dixit <riyadixitagra@gmail.com>

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BIOS: support readonly attributes

Since the P10 system has BMC to manager the BIOS attributes,
and the BMC side does not know the attribute values of the BIOS,
it should allow the OO

BIOS: support readonly attributes

Since the P10 system has BMC to manager the BIOS attributes,
and the BMC side does not know the attribute values of the BIOS,
it should allow the OOB interface(Host) to be able to set BIOS
readOnly attributes, while still preventing the redfish-doPATCH
operation on it.

Tested: if the readOnly attribute of the pvm_system_name is true,
so we can use `pldmtool` to update the BIOS attributes.

pldmtool bios SetBIOSAttributeCurrentValue -a pvm_system_name -d XXX
{
"Response": "SUCCESS"
}

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: Iabcb5c2400eb0a5c208cc76180d4b07e02457f44

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treewide: remove 'using namespace' from headers

Using namespace at global scope in a header file violates the cpp core
guidelines. Quoting the guidelines:

"Doing so takes awa

treewide: remove 'using namespace' from headers

Using namespace at global scope in a header file violates the cpp core
guidelines. Quoting the guidelines:

"Doing so takes away an #includer’s ability to effectively
disambiguate and to use alternatives. It also makes #included headers
order-dependent as they might have different meaning when included in
different orders."

For further reading:
https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rs-using-directive

The guidelines don't call out using using namespace from namespace
scope, but it is only marginally less problematic and still unexpected,
so this patch removes those as well.

The process used to do the update is roughly:

1 - git grep 'using namespace' **.hpp
2 - For each instance, remove the offending 'using namespace' line
3 - build
4 - add 'using namespace' to cpp files or fully resolve types in hpp
files until the project builds again.

Further cleanup is possible - for example cpp files could be scrubbed
for unnecessary namespace qualification - this was not done here to make
review as simple as possible.

Change-Id: I4931f5e78a1b5b74b4a4774c035a549f4d59b91a
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>

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bios: Initialise the bios attributes from bios-settings-manager

The bios-settings-manager is persisting the current value for the PLDM
BIOS attributes. The PLDM daemon will lookup the bi

bios: Initialise the bios attributes from bios-settings-manager

The bios-settings-manager is persisting the current value for the PLDM
BIOS attributes. The PLDM daemon will lookup the bios-settings-manager
for the current value and create the BIOS attribute value table.

Signed-off-by: Tom Joseph <tomjoseph@in.ibm.com>
Change-Id: I6a7a9ff9c3766189e6a64ab88c5c5e438881151f

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BIOS: Fix readOnly BIOS attributes

Previously, the readOnly property is true when without a D-Bus section in BIOS
JSON. Now, the readOnly property should be determined by a new readOnly

BIOS: Fix readOnly BIOS attributes

Previously, the readOnly property is true when without a D-Bus section in BIOS
JSON. Now, the readOnly property should be determined by a new readOnly field,
which should be introduced in the JSON. The checks are updated to ensure that
if there is D-Bus mapping then only D-Bus lookups are done.

Tested: test with json
https://gist.github.com/lxwinspur/2afffff2e445fddf90dfed6eceef4014

busctl get-property xyz.openbmc_project.BIOSConfigManager
/xyz/openbmc_project/bios_config/manager xyz.openbmc_project.BIOSConfig.Manager
BaseBIOSTable

a{s(sbsssvva(sv))} 5
"CodeUpdatePolicy"
"xyz.openbmc_project.BIOSConfig.Manager.AttributeType.Enumeration"
true "" "" "" s "Concurrent" s "Concurrent" 2
"xyz.openbmc_project.BIOSConfig.Manager.BoundType.OneOf" s "Concurrent"
"xyz.openbmc_project.BIOSConfig.Manager.BoundType.OneOf" s "Disruptive"

"Led"
"xyz.openbmc_project.BIOSConfig.Manager.AttributeType.Enumeration"
false "" "" "" s "Off" s "Off" 2
"xyz.openbmc_project.BIOSConfig.Manager.BoundType.OneOf" s "On"
"xyz.openbmc_project.BIOSConfig.Manager.BoundType.OneOf" s "Off"

"Model"
"xyz.openbmc_project.BIOSConfig.Manager.AttributeType.String"
false "" "" "" s "powersupply0" s "FP5280G2" 2
"xyz.openbmc_project.BIOSConfig.Manager.BoundType.MinStringLength" x 1
"xyz.openbmc_project.BIOSConfig.Manager.BoundType.MaxStringLength" x 100

"OUTLET"
"xyz.openbmc_project.BIOSConfig.Manager.AttributeType.Integer"
false "" "" "" x 9149282306036291456 x 0 3
"xyz.openbmc_project.BIOSConfig.Manager.BoundType.LowerBound" x 0
"xyz.openbmc_project.BIOSConfig.Manager.BoundType.UpperBound" x 68002
"xyz.openbmc_project.BIOSConfig.Manager.BoundType.ScalarIncrement" x 1

"str_example3"
"xyz.openbmc_project.BIOSConfig.Manager.AttributeType.String"
true "" "" "" s "ef" s "ef" 2
"xyz.openbmc_project.BIOSConfig.Manager.BoundType.MinStringLength" x 1
"xyz.openbmc_project.BIOSConfig.Manager.BoundType.MaxStringLength" x 100

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I73d2dcb9fc65a1aa8bbd060cfb9d44e708b47aae

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support runtime update of BIOS attributes

Register the BIOSConfig/PendingAttributes signal and when the out of band
redfish user updates the BIOS attributes, the pldm daemon should proce

support runtime update of BIOS attributes

Register the BIOSConfig/PendingAttributes signal and when the out of band
redfish user updates the BIOS attributes, the pldm daemon should process and
check the PendingAttributes porperty, and then update the
BIOSConfig/BaseBIOSTable property and the BIOS table.

Tested: test JSON with
https://gist.github.com/lxwinspur/2afffff2e445fddf90dfed6eceef4014
Type.Enumeration:
~#: busctl set-property xyz.openbmc_project.BIOSConfigManager
/xyz/openbmc_project/bios_config/manager
xyz.openbmc_project.BIOSConfig.Manager PendingAttributes a\{s\(sv\)\} 1
"Led" "xyz.openbmc_project.BIOSConfig.Manager.AttributeType.Enumeration" s
"xyz.openbmc_project.Led.Physical.Action.On"
~#: pldmtool bios getbiostable -t 2
PLDM AttributeValueTable:
... ...
AttributeHandle: 3
AttributeType: BIOSEnumeration
NumberOfCurrentValues: 1
CurrentValueStringHandleIndex[0] = 0, StringHandle = On
... ...

Type.String
~#: busctl set-property xyz.openbmc_project.BIOSConfigManager
/xyz/openbmc_project/bios_config/manager
xyz.openbmc_project.BIOSConfig.Manager PendingAttributes a\{s\(sv\)\} 1
"Model" "xyz.openbmc_project.BIOSConfig.Manager.AttributeType.String" s
"testModel"
~#: pldmtool bios getbiostable -t 2
PLDM AttributeValueTable:
AttributeHandle: 0
AttributeType: BIOSString
CurrentStringLength: 10
CurrentString: testModel
... ...

Type.Integer
~#: busctl set-property xyz.openbmc_project.BIOSConfigManager
/xyz/openbmc_project/bios_config/manager
xyz.openbmc_project.BIOSConfig.Manager PendingAttributes a\{s\(sv\)\} 1
"OUTLET" "xyz.openbmc_project.BIOSConfig.Manager.AttributeType.Integer" x
1000
~#: pldmtool bios getbiostable -t 2
... ...
AttributeHandle: 2
AttributeType: BIOSInteger
CurrentValue: 1000
... ...

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I4d4d2941e6c9bfa7f6fccb664db1580f2ffc9c9f

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common: code re-org

Move common files under a common/ directory.

Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>
Change-Id: I0eaf91d4ee94c1e78228da0c50892f82e91912fa

libpldmresponder: enable DBus change notification

This commit enables libpldmresponder to subscribe to DBus
property change signal for the BIOS properties which are fetched from
DBus

libpldmresponder: enable DBus change notification

This commit enables libpldmresponder to subscribe to DBus
property change signal for the BIOS properties which are fetched from
DBus. The new DBus value is received and the relevant entry in the
attributeValueTable is updated.

test result:

root@rainier:/tmp# pldmtool bios GetBIOSTable -t 0
Parsed Response Msg:
PLDM StringTable:
BIOSStringHandle : BIOSString
0 : Allowed
1 : Disabled
2 : Enabled
3 : IPv4DHCP
4 : IPv4Static
5 : Not Allowed
6 : Perm
7 : Temp
8 : pvm-fw-boot-side
9 : pvm-inband-code-update
10 : pvm-os-boot-side
11 : pvm-pcie-error-inject
12 : pvm-surveillance
13 : pvm-system-name
14 : vmi-hostname
15 : vmi-if-count
16 : vmi-if0-ipv4-ipaddr
17 : vmi-if0-ipv4-method
18 : vmi-if0-ipv4-prefix-length
19 : vmi-if1-ipv4-ipaddr
20 : vmi-if1-ipv4-method
21 : vmi-if1-ipv4-prefix-length
22 : vmi-ipv4-gateway
root@rainier:/tmp#

root@rainier:/tmp# pldmtool bios GetBIOSTable -t 1
Parsed Response Msg:
PLDM AttributeTable:
AttributeHandle: 0, AttributeNameHandle: 13(pvm-system-name)
AttributeType: BIOSStringReadOnly
StringType: 0x01
MinimumStringLength: 1
MaximumStringLength: 100
DefaultStringLength: 15
DefaultString: witherspoon-128
AttributeHandle: 1, AttributeNameHandle: 14(vmi-hostname)
AttributeType: BIOSString
StringType: 0x01
MinimumStringLength: 0
MaximumStringLength: 255
DefaultStringLength: 0
DefaultString:
AttributeHandle: 2, AttributeNameHandle: 22(vmi-ipv4-gateway)
AttributeType: BIOSString
StringType: 0x01
MinimumStringLength: 7
MaximumStringLength: 15
DefaultStringLength: 7
DefaultString: 0.0.0.0
AttributeHandle: 3, AttributeNameHandle: 16(vmi-if0-ipv4-ipaddr)
AttributeType: BIOSString
StringType: 0x01
MinimumStringLength: 7
MaximumStringLength: 15
DefaultStringLength: 7
DefaultString: 0.0.0.0
AttributeHandle: 4, AttributeNameHandle: 19(vmi-if1-ipv4-ipaddr)
AttributeType: BIOSString
StringType: 0x01
MinimumStringLength: 7
MaximumStringLength: 15
DefaultStringLength: 7
DefaultString: 0.0.0.0
AttributeHandle: 5, AttributeNameHandle: 15(vmi-if-count)
AttributeType: BIOSIntegerReadOnly
LowerBound: 0
UpperBound: 2
ScalarIncrement: 1
DefaultValue: 1
AttributeHandle: 6, AttributeNameHandle: 18(vmi-if0-ipv4-prefix-length)
AttributeType: BIOSInteger
LowerBound: 0
UpperBound: 32
ScalarIncrement: 1
DefaultValue: 0
AttributeHandle: 7, AttributeNameHandle: 21(vmi-if1-ipv4-prefix-length)
AttributeType: BIOSInteger
LowerBound: 0
UpperBound: 32
ScalarIncrement: 1
DefaultValue: 0
AttributeHandle: 8, AttributeNameHandle: 8(pvm-fw-boot-side)
AttributeType: BIOSEnumerationReadOnly
NumberOfPossibleValues: 2
PossibleValueStringHandle[0] = 6(Perm)
PossibleValueStringHandle[1] = 7(Temp)
NumberOfDefaultValues: 1
DefaultValueStringHandleIndex[0] = 0, StringHandle = 6(Perm)
AttributeHandle: 9, AttributeNameHandle: 10(pvm-os-boot-side)
AttributeType: BIOSEnumerationReadOnly
NumberOfPossibleValues: 2
PossibleValueStringHandle[0] = 6(Perm)
PossibleValueStringHandle[1] = 7(Temp)
NumberOfDefaultValues: 1
DefaultValueStringHandleIndex[0] = 0, StringHandle = 6(Perm)
AttributeHandle: 10, AttributeNameHandle: 9(pvm-inband-code-update)
AttributeType: BIOSEnumerationReadOnly
NumberOfPossibleValues: 2
PossibleValueStringHandle[0] = 0(Allowed)
PossibleValueStringHandle[1] = 5(Not Allowed)
NumberOfDefaultValues: 1
DefaultValueStringHandleIndex[0] = 0, StringHandle = 0(Allowed)
AttributeHandle: 11, AttributeNameHandle: 12(pvm-surveillance)
AttributeType: BIOSEnumerationReadOnly
NumberOfPossibleValues: 2
PossibleValueStringHandle[0] = 1(Disabled)
PossibleValueStringHandle[1] = 2(Enabled)
NumberOfDefaultValues: 1
DefaultValueStringHandleIndex[0] = 1, StringHandle = 2(Enabled)
AttributeHandle: 12, AttributeNameHandle: 11(pvm-pcie-error-inject)
AttributeType: BIOSEnumerationReadOnly
NumberOfPossibleValues: 2
PossibleValueStringHandle[0] = 1(Disabled)
PossibleValueStringHandle[1] = 2(Enabled)
NumberOfDefaultValues: 1
DefaultValueStringHandleIndex[0] = 1, StringHandle = 2(Enabled)
AttributeHandle: 13, AttributeNameHandle: 17(vmi-if0-ipv4-method)
AttributeType: BIOSEnumeration
NumberOfPossibleValues: 2
PossibleValueStringHandle[0] = 4(IPv4Static)
PossibleValueStringHandle[1] = 3(IPv4DHCP)
NumberOfDefaultValues: 1
DefaultValueStringHandleIndex[0] = 0, StringHandle = 4(IPv4Static)
AttributeHandle: 14, AttributeNameHandle: 20(vmi-if1-ipv4-method)
AttributeType: BIOSEnumeration
NumberOfPossibleValues: 2
PossibleValueStringHandle[0] = 4(IPv4Static)
PossibleValueStringHandle[1] = 3(IPv4DHCP)
NumberOfDefaultValues: 1
DefaultValueStringHandleIndex[0] = 0, StringHandle = 4(IPv4Static)
root@rainier:/tmp#

root@rainier:/tmp# pldmtool bios GetBIOSTable -t 2
Parsed Response Msg:
PLDM AttributeValueTable:
AttributeHandle: 0
AttributeType: BIOSStringReadOnly
CurrentStringLength: 15
CurrentString: witherspoon-128
AttributeHandle: 1
AttributeType: BIOSString
CurrentStringLength: 0
CurrentString:
AttributeHandle: 2
AttributeType: BIOSString
CurrentStringLength: 7
CurrentString: 0.0.0.0
AttributeHandle: 3
AttributeType: BIOSString
CurrentStringLength: 7
CurrentString: 0.0.0.0
AttributeHandle: 4
AttributeType: BIOSString
CurrentStringLength: 7
CurrentString: 0.0.0.0
AttributeHandle: 5
AttributeType: BIOSIntegerReadOnly
CurrentValue: 1
AttributeHandle: 6
AttributeType: BIOSInteger
CurrentValue: 0
AttributeHandle: 7
AttributeType: BIOSInteger
CurrentValue: 0
AttributeHandle: 8
AttributeType: BIOSEnumerationReadOnly
NumberOfCurrentValues: 1
CurrentValueStringHandleIndex[0] = 0, StringHandle = 6(Perm)
AttributeHandle: 9
AttributeType: BIOSEnumerationReadOnly
NumberOfCurrentValues: 1
CurrentValueStringHandleIndex[0] = 0, StringHandle = 6(Perm)
AttributeHandle: 10
AttributeType: BIOSEnumerationReadOnly
NumberOfCurrentValues: 1
CurrentValueStringHandleIndex[0] = 0, StringHandle = 0(Allowed)
AttributeHandle: 11
AttributeType: BIOSEnumerationReadOnly
NumberOfCurrentValues: 1
CurrentValueStringHandleIndex[0] = 1, StringHandle = 2(Enabled)
AttributeHandle: 12
AttributeType: BIOSEnumerationReadOnly
NumberOfCurrentValues: 1
CurrentValueStringHandleIndex[0] = 1, StringHandle = 2(Enabled)
AttributeHandle: 13
AttributeType: BIOSEnumeration
NumberOfCurrentValues: 1
CurrentValueStringHandleIndex[0] = 0, StringHandle = 4(IPv4Static)
AttributeHandle: 14
AttributeType: BIOSEnumeration
NumberOfCurrentValues: 1
CurrentValueStringHandleIndex[0] = 0, StringHandle = 4(IPv4Static)
root@rainier:/tmp#

root@rainier:/tmp# busctl get-property xyz.openbmc_project.Settings
/xyz/openbmc_project/network/vmi/intf1/ipv4/addr0 xyz.openbmc_project.Network.IP
PrefixLength
y 0

root@rainier:/tmp# busctl set-property xyz.openbmc_project.Settings
/xyz/openbmc_project/network/vmi/intf1/ipv4/addr0 xyz.openbmc_project.Network.IP
PrefixLength y 6

root@rainier:/tmp# busctl get-property xyz.openbmc_project.Settings
/xyz/openbmc_project/network/vmi/intf1/ipv4/addr0 xyz.openbmc_project.Network.IP
Origin
s "xyz.openbmc_project.Network.IP.AddressOrigin.Static"

root@rainier:/tmp# busctl set-property xyz.openbmc_project.Settings
/xyz/openbmc_project/network/vmi/intf1/ipv4/addr0 xyz.openbmc_project.Network.IP
Origin s "xyz.openbmc_project.Network.IP.AddressOrigin.DHCP"

root@rainier:/tmp# busctl get-property xyz.openbmc_project.Settings
/xyz/openbmc_project/network/vmi/intf1/ipv4/addr0 xyz.openbmc_project.Network.IP
Address
s "0.0.0.0"

root@rainier:/tmp# busctl set-property xyz.openbmc_project.Settings
/xyz/openbmc_project/network/vmi/intf1/ipv4/addr0 xyz.openbmc_project.Network.IP
Address s "1.2.3.4"

root@rainier:/tmp# pldmtool bios GetBIOSTable -t 2
Parsed Response Msg:
PLDM AttributeValueTable:
AttributeHandle: 0
AttributeType: BIOSStringReadOnly
CurrentStringLength: 15
CurrentString: witherspoon-128
AttributeHandle: 1
AttributeType: BIOSString
CurrentStringLength: 0
CurrentString:
AttributeHandle: 2
AttributeType: BIOSString
CurrentStringLength: 7
CurrentString: 0.0.0.0
AttributeHandle: 3
AttributeType: BIOSString
CurrentStringLength: 7
CurrentString: 0.0.0.0
AttributeHandle: 4
AttributeType: BIOSString
CurrentStringLength: 7
CurrentString: 1.2.3.4
AttributeHandle: 5
AttributeType: BIOSIntegerReadOnly
CurrentValue: 1
AttributeHandle: 6
AttributeType: BIOSInteger
CurrentValue: 0
AttributeHandle: 7
AttributeType: BIOSInteger
CurrentValue: 6
AttributeHandle: 8
AttributeType: BIOSEnumerationReadOnly
NumberOfCurrentValues: 1
CurrentValueStringHandleIndex[0] = 0, StringHandle = 6(Perm)
AttributeHandle: 9
AttributeType: BIOSEnumerationReadOnly
NumberOfCurrentValues: 1
CurrentValueStringHandleIndex[0] = 0, StringHandle = 6(Perm)
AttributeHandle: 10
AttributeType: BIOSEnumerationReadOnly
NumberOfCurrentValues: 1
CurrentValueStringHandleIndex[0] = 0, StringHandle = 0(Allowed)
AttributeHandle: 11
AttributeType: BIOSEnumerationReadOnly
NumberOfCurrentValues: 1
CurrentValueStringHandleIndex[0] = 1, StringHandle = 2(Enabled)
AttributeHandle: 12
AttributeType: BIOSEnumerationReadOnly
NumberOfCurrentValues: 1
CurrentValueStringHandleIndex[0] = 1, StringHandle = 2(Enabled)
AttributeHandle: 13
AttributeType: BIOSEnumeration
NumberOfCurrentValues: 1
CurrentValueStringHandleIndex[0] = 0, StringHandle = 4(IPv4Static)
AttributeHandle: 14
AttributeType: BIOSEnumeration
NumberOfCurrentValues: 1
CurrentValueStringHandleIndex[0] = 1, StringHandle = 3(IPv4DHCP)

Change-Id: I60e8f916a82bda0ef27c8c482fafb755b65210b4
Signed-off-by: Sampa Misra <sampmisr@in.ibm.com>

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bios: Implement BIOSStringAttribute

Implement BIOSStringAttribute, most of the code is copied from
bios/bios_parser.cpp.

Implement SetAttrValueOnDbus and constructEntry for stri

bios: Implement BIOSStringAttribute

Implement BIOSStringAttribute, most of the code is copied from
bios/bios_parser.cpp.

Implement SetAttrValueOnDbus and constructEntry for string attribute

Signed-off-by: John Wang <wangzqbj@inspur.com>
Change-Id: Ic7c6b35d32738d698d7649f97cb7843606b8a2ba

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