tpm: Move TPM common base definitions to the command header

These are top level definitions shared by both TPM 1 and 2
family chips. This includes core definitions like TPM localities,
common crypto algorithm IDs, and the base TPM command header.

Co-developed-by: Daniel P. Smith <dpsmith@apertussolutions.com>
Signed-off-by: Daniel P. Smith <dpsmith@apertussolutions.com>
Co-developed-by: Alec Brown <alec.r.brown@oracle.com>
Signed-off-by: Alec Brown <alec.r.brown@oracle.com>
Signed-off-by: Ross Philipson <ross.philipson@gmail.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>

1 files changed, 91 insertions, 0 deletions

diff --git a/include/linux/tpm_command.h b/include/linux/tpm_command.h
index 9dd903dd6b5c..fc446a1282e2 100644
--- a/include/linux/tpm_command.h
+++ b/include/linux/tpm_command.h
@@ -2,6 +2,8 @@
 #ifndef __LINUX_TPM_COMMAND_H__
 #define __LINUX_TPM_COMMAND_H__
 
+#include <crypto/sha2.h>
+
 /*
  * == TPM 1 Family Chips ==
  *
@@ -427,4 +429,93 @@ struct tpm2_context {
 	__be16 blob_size;
 } __packed;
 
+/*
+ * == TPM Common Defs ==
+ */
+
+#define TPM_DIGEST_SIZE		20	/* Max TPM v1.2 PCR size */
+#define TPM_BUFSIZE		4096
+
+/*
+ * SHA-512 is, as of today, the largest digest in the TCG algorithm repository.
+ */
+#define TPM2_MAX_DIGEST_SIZE	SHA512_DIGEST_SIZE
+
+/*
+ * A TPM name digest i.e., TPMT_HA, is a concatenation of TPM_ALG_ID of the
+ * name algorithm and hash of TPMT_PUBLIC.
+ */
+#define TPM2_MAX_NAME_SIZE	(TPM2_MAX_DIGEST_SIZE + 2)
+
+/*
+ * Fixed define for the size of a name.  This is actually HASHALG size
+ * plus 2, so 32 for SHA256
+ */
+#define TPM2_NULL_NAME_SIZE	34
+
+/*
+ * The maximum number of PCR banks.
+ */
+#define TPM2_MAX_PCR_BANKS	8
+
+/* If you add a new hash to this, increment TPM_MAX_HASHES below */
+enum tpm_algorithms {
+	TPM_ALG_ERROR		= 0x0000,
+	TPM_ALG_SHA1		= 0x0004,
+	TPM_ALG_AES		= 0x0006,
+	TPM_ALG_KEYEDHASH	= 0x0008,
+	TPM_ALG_SHA256		= 0x000B,
+	TPM_ALG_SHA384		= 0x000C,
+	TPM_ALG_SHA512		= 0x000D,
+	TPM_ALG_NULL		= 0x0010,
+	TPM_ALG_SM3_256		= 0x0012,
+	TPM_ALG_ECC		= 0x0023,
+	TPM_ALG_CFB		= 0x0043,
+};
+
+/*
+ * The locality (0 - 4) for a TPM, as defined in section 3.2 of the
+ * Client Platform Profile Specification.
+ */
+enum tpm_localities {
+	TPM_LOCALITY_0		= 0, /* Static RTM */
+	TPM_LOCALITY_1		= 1, /* Dynamic OS */
+	TPM_LOCALITY_2		= 2, /* DRTM Environment */
+	TPM_LOCALITY_3		= 3, /* Aux Components */
+	TPM_LOCALITY_4		= 4, /* CPU DRTM Establishment */
+	TPM_MAX_LOCALITY	= TPM_LOCALITY_4
+};
+
+/*
+ * Structure to represent active PCR algorithm banks usable by the
+ * TPM chip.
+ */
+struct tpm_bank_info {
+	u16 alg_id;
+	u16 digest_size;
+	u16 crypto_id;
+};
+
+/*
+ * Maximum number of hashing algorithms a TPM can have.  This is
+ * basically a count of every hash in tpm_algorithms above
+ */
+#define TPM_MAX_HASHES		5
+
+struct tpm_digest {
+	u16 alg_id;
+	u8 digest[TPM2_MAX_DIGEST_SIZE];
+} __packed;
+
+#define TPM_HEADER_SIZE		10
+
+struct tpm_header {
+	__be16 tag;
+	__be32 length;
+	union {
+		__be32 ordinal;
+		__be32 return_code;
+	};
+} __packed;
+
 #endif