[PATCH v15 04/28] tpm: Move TPM common base definitions to new public common header

Ross Philipson
2025-12-15T23:40:35Z

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

Signed-off-by: Daniel P. Smith <dpsmith@apertussolutions.com>
Signed-off-by: Ross Philipson <ross.philipson@oracle.com>
---
drivers/char/tpm/tpm.h | 6 ----
include/linux/tpm.h | 44 -------------------------
include/linux/tpm2.h | 5 ---
include/linux/tpm_common.h | 67 ++++++++++++++++++++++++++++++++++++++
4 files changed, 67 insertions(+), 55 deletions(-)

diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index faac3c7065bf..7d608b166bbf 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -50,12 +50,6 @@ enum tpm_addr {
TPM_ADDR = 0x4E,
};

-/* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
- * bytes, but 128 is still a relatively large number of random bytes and
- * anything much bigger causes users of struct tpm_cmd_t to start getting
- * compiler warnings about stack frame size. */
-#define TPM_MAX_RNG_DATA 128
-
#include "tpm1_structs.h"
#include "tpm2_structs.h"

diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index e77e3e2c1d9e..8a778bcc2dd5 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -29,47 +29,12 @@
#include "tpm1.h"
#include "tpm2.h"

-#define TPM_DIGEST_SIZE 20 /* Max TPM v1.2 PCR size */
-#define TPM_HEADER_SIZE 10
-#define TPM_BUFSIZE 4096
-
-#define TPM2_PLATFORM_PCR 24
-#define TPM2_PCR_SELECT_MIN 3
-#define TPM2_MAX_DIGEST_SIZE SHA512_DIGEST_SIZE
-#define TPM2_MAX_BANKS 4
-
struct tpm_chip;
struct trusted_key_payload;
struct trusted_key_options;
/* opaque structure, holds auth session parameters like the session key */
struct tpm2_auth;

-/* 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,
-};
-
-/*
- * 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;
-
struct tpm_bank_info {
u16 alg_id;
u16 digest_size;
@@ -243,15 +208,6 @@ enum tpm_chip_flags {

#define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)

-struct tpm_header {
- __be16 tag;
- __be32 length;
- union {
- __be32 ordinal;
- __be32 return_code;
- };
-} __packed;
-
enum tpm_buf_flags {
/* TPM2B format: */
TPM_BUF_TPM2B = BIT(0),
diff --git a/include/linux/tpm2.h b/include/linux/tpm2.h
index f87489aea780..c2ece73a54c5 100644
--- a/include/linux/tpm2.h
+++ b/include/linux/tpm2.h
@@ -164,11 +164,6 @@ enum tpm2_session_attributes {
TPM2_SA_AUDIT = BIT(7),
};

-enum tpm2_pcr_select {
- TPM2_PLATFORM_PCR = 24,
- TPM2_PCR_SELECT_MIN = ((TPM2_PLATFORM_PCR + 7) / 8),
-};
-
enum tpm2_handle_types {
TPM2_HT_HMAC_SESSION = 0x02000000,
TPM2_HT_POLICY_SESSION = 0x03000000,
diff --git a/include/linux/tpm_common.h b/include/linux/tpm_common.h
index b8be669913dd..b5c6b2c1e517 100644
--- a/include/linux/tpm_common.h
+++ b/include/linux/tpm_common.h
@@ -19,4 +19,71 @@

#define TPM_MAX_ORDINAL 243

+#define TPM_DIGEST_SIZE 20 /* Max TPM v1.2 PCR size */
+#define TPM_HEADER_SIZE 10
+#define TPM_BUFSIZE 4096
+
+#define TPM2_PLATFORM_PCR 24
+#define TPM2_PCR_SELECT_MIN 3
+#define TPM2_MAX_DIGEST_SIZE SHA512_DIGEST_SIZE
+#define TPM2_MAX_BANKS 4
+
+/* 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
+};
+
+/*
+ * 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
+ * bytes, but 128 is still a relatively large number of random bytes and
+ * anything much bigger causes users of struct tpm_cmd_t to start getting
+ * compiler warnings about stack frame size.
+ */
+#define TPM_MAX_RNG_DATA 128
+
+/*
+ * 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
--
2.43.7