smbios-mdr: Add TPM Device Information
Type 43 of SMBIOS records defines the data structure to expose
TPM Device information. Add patch which displays the TPM Device
information on dbus.
Introduced `TPM_DBUS` meson option which will be disabled by default
When enabled, the TPM information is populated on DBUS.
Tested:
TPM information is available under dbus tree of smbios-mdr
```
:~# busctl tree xyz.openbmc_project.Smbios.MDR_V2
`- /xyz
`- /xyz/openbmc_project
|- /xyz/openbmc_project/Smbios
| `- /xyz/openbmc_project/Smbios/MDR_V2
|- /xyz/openbmc_project/inventory
| `- /xyz/openbmc_project/inventory/system
| `- /xyz/openbmc_project/inventory/system/chassis
| |- /xyz/openbmc_project/inventory/system/chassis/motherboard/bios
| `- /xyz/openbmc_project/inventory/system/chassis/motherboard/tpm
```
Change-Id: Icd42f4f043bf5a970f4829e5d318568360fe4b59
Signed-off-by: Prithvi Pai <ppai@nvidia.com>
diff --git a/src/tpm.cpp b/src/tpm.cpp
new file mode 100644
index 0000000..74279d0
--- /dev/null
+++ b/src/tpm.cpp
@@ -0,0 +1,102 @@
+#include "tpm.hpp"
+
+#include "mdrv2.hpp"
+
+#include <fstream>
+#include <iomanip>
+#include <iostream>
+#include <sstream>
+
+namespace phosphor
+{
+namespace smbios
+{
+
+void Tpm::tpmInfoUpdate(uint8_t* smbiosTableStorage,
+ const std::string& motherboard)
+{
+ storage = smbiosTableStorage;
+ motherboardPath = motherboard;
+
+ uint8_t* dataIn = storage;
+ dataIn = getSMBIOSTypePtr(dataIn, tpmDeviceType);
+ if (dataIn == nullptr)
+ {
+ return;
+ }
+ for (uint8_t index = 0; index < tpmId; index++)
+ {
+ dataIn = smbiosNextPtr(dataIn);
+ if (dataIn == nullptr)
+ {
+ return;
+ }
+ dataIn = getSMBIOSTypePtr(dataIn, tpmDeviceType);
+ if (dataIn == nullptr)
+ {
+ return;
+ }
+ }
+ auto tpmInfo = reinterpret_cast<struct TPMInfo*>(dataIn);
+
+ present(true);
+ purpose(softwareversion::VersionPurpose::Other);
+ tpmVendor(tpmInfo);
+ tpmFirmwareVersion(tpmInfo);
+ tpmDescription(tpmInfo->description, tpmInfo->length, dataIn);
+ if (!motherboardPath.empty())
+ {
+ std::vector<std::tuple<std::string, std::string, std::string>> assocs;
+ assocs.emplace_back("chassis", "trusted_components", motherboardPath);
+ association::associations(assocs);
+ }
+}
+
+void Tpm::tpmVendor(const struct TPMInfo* tpmInfo)
+{
+ constexpr int vendorIdLength = 4;
+ // Specified as four ASCII characters, as defined by TCG Vendor ID
+ char vendorId[vendorIdLength + 1];
+ int i;
+ for (i = 0; i < vendorIdLength && tpmInfo->vendor[i] != '\0'; i++)
+ {
+ if (std::isprint(tpmInfo->vendor[i]))
+ {
+ vendorId[i] = tpmInfo->vendor[i];
+ }
+ else
+ {
+ vendorId[i] = '.';
+ }
+ }
+ vendorId[i] = '\0';
+ manufacturer(vendorId);
+}
+
+void Tpm::tpmFirmwareVersion(const struct TPMInfo* tpmInfo)
+{
+ std::stringstream stream;
+
+ if (tpmInfo->specMajor == tpmMajorVerion1)
+ {
+ auto ver = reinterpret_cast<const struct TPMVersionSpec1*>(
+ &tpmInfo->firmwareVersion1);
+ stream << ver->revMajor << "." << ver->revMinor;
+ }
+ else if (tpmInfo->specMajor == tpmMajorVerion2)
+ {
+ auto ver = reinterpret_cast<const struct TPMVersionSpec2*>(
+ &tpmInfo->firmwareVersion1);
+ stream << ver->revMajor << "." << ver->revMinor;
+ }
+ version(stream.str());
+}
+
+void Tpm::tpmDescription(const uint8_t positionNum, const uint8_t structLen,
+ uint8_t* dataIn)
+{
+ std::string result = positionToString(positionNum, structLen, dataIn);
+ prettyName(result);
+}
+} // namespace smbios
+} // namespace phosphor