tpm: Retrieve the PCR Bank configuration

Implement tpm20_get_capability and retrieve the PCR Bank configuration
from the TPM using this function.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/src/std/tcg.h b/src/std/tcg.h
index c59f6715..d60ee09a 100644
--- a/src/std/tcg.h
+++ b/src/std/tcg.h
@@ -394,12 +394,16 @@ struct tpm_res_sha1complete {
 #define TPM2_CC_SelfTest            0x143
 #define TPM2_CC_Startup             0x144
 #define TPM2_CC_StirRandom          0x146
+#define TPM2_CC_GetCapability       0x17a
 #define TPM2_CC_GetRandom           0x17b
 #define TPM2_CC_PCR_Extend          0x182
 
 /* TPM 2 error codes */
 #define TPM2_RC_INITIALIZE          0x100
 
+/* TPM 2 Capabilities */
+#define TPM2_CAP_PCRS               0x00000005
+
 /* TPM 2 data structures */
 
 struct tpm2b_stir {
@@ -475,6 +479,31 @@ struct tpm2_req_hierarchycontrol {
     u8 state;
 } PACKED;
 
+struct tpm2_req_getcapability {
+    struct tpm_req_header hdr;
+    u32 capability;
+    u32 property;
+    u32 propertycount;
+} PACKED;
+
+struct tpm2_res_getcapability {
+    struct tpm_rsp_header hdr;
+    u8 moreData;
+    u32 capability;
+    u8 data[0]; /* capability dependent data */
+} PACKED;
+
+struct tpms_pcr_selection {
+    u16 hashAlg;
+    u8 sizeOfSelect;
+    u8 pcrSelect[0];
+} PACKED;
+
+struct tpml_pcr_selection {
+    u32 count;
+    struct tpms_pcr_selection selections[0];
+} PACKED;
+
 /* TPM 2 log entry */
 
 struct tpml_digest_values_sha1 {