Update 'is TPM Required' checking to include the use of a new sensor

This commit adds the support to read the new "is TPM Required" sensor
and updates the decision tree of whether or not the system requires a
TPM to be present.

Change-Id: I61871935d59272351ea1aa769641579efeee2f7e
RTC:167580
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/39592
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Stephen M. Cprek <smcprek@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Reviewed-by: Nicholas E. Bofferding <bofferdn@us.ibm.com>
Reviewed-by: Timothy R. Block <block@us.ibm.com>
Reviewed-by: Christopher J. Engel <cjengel@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/src/usr/secureboot/trusted/trustedboot.H b/src/usr/secureboot/trusted/trustedboot.H
index 64a3bd727..660bf92de 100644
--- a/src/usr/secureboot/trusted/trustedboot.H
+++ b/src/usr/secureboot/trusted/trustedboot.H
@@ -202,6 +202,21 @@ void getTpmWithRoleOf(
     TARGETING::TPM_ROLE i_tpmRole,
     TARGETING::Target*& o_pTpm);
 
+/**
+ *  @brief Returns value of TPM Sensor if it is available
+ *         All error handing is contained in the function and the output value
+ *         is only valid if the function returns TRUE
+ *
+ *  @param[out] o_isTpmRequired Value returned from TPM Required sensor:
+ *              TRUE if TPM is required; FALSE if TPM is NOT required
+ *              NOTE: this parameter is only valid if this function returns TRUE
+ *
+ *  @return bool  Returns TRUE if sensor was available and found without error;
+ *                otherwise returns FALSE
+ */
+bool getTpmRequiredSensorValue(
+    bool& o_isTpmRequired);
+
 
 } // end TRUSTEDBOOT namespace
 #endif