Add a few new functions which will be used by the test command in a future
patch.
Signed-off-by: Simon Glass <s...@chromium.org>
---
Changes in v2:
- Add new patch with functions to access flags and permissions
include/tpm.h | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
lib/tpm.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 99 insertions(+), 1 deletion(-)
diff --git a/include/tpm.h b/include/tpm.h
index 445952b..086b672 100644
--- a/include/tpm.h
+++ b/include/tpm.h
@@ -49,6 +49,15 @@ enum tpm_nv_index {
TPM_NV_INDEX_DIR = 0x10000001,
};
+#define TPM_NV_PER_GLOBALLOCK (1U << 15)
+#define TPM_NV_PER_PPWRITE (1U << 0)
+#define TPM_NV_PER_READ_STCLEAR (1U << 31)
+#define TPM_NV_PER_WRITE_STCLEAR (1U << 14)
+
+enum {
+ TPM_PUBEK_SIZE = 256,
+};
+
/**
* TPM return codes as defined in the TCG Main specification
* (TPM Main Part 2 Structures; Specification version 1.2)
@@ -163,6 +172,30 @@ enum tpm_return_code {
TPM_DEFEND_LOCK_RUNNING = TPM_BASE + TPM_NON_FATAL + 3,
};
+struct tpm_permanent_flags {
+ __be16 tag;
+ u8 disable;
+ u8 ownership;
+ u8 deactivated;
+ u8 read_pubek;
+ u8 disable_owner_clear;
+ u8 allow_maintenance;
+ u8 physical_presence_lifetime_lock;
+ u8 physical_presence_hw_enable;
+ u8 physical_presence_cmd_enable;
+ u8 cekp_used;
+ u8 tpm_post;
+ u8 tpm_post_lock;
+ u8 fips;
+ u8 operator;
+ u8 enable_revoke_ek;
+ u8 nv_locked;
+ u8 read_srk_pub;
+ u8 tpm_established;
+ u8 maintenance_done;
+ u8 disable_full_da_logic_info;
+} __packed;
+
#ifdef CONFIG_DM_TPM
/* Max buffer size supported by our tpm */
@@ -551,4 +584,20 @@ uint32_t tpm_load_key2_oiap(uint32_t parent_handle,
uint32_t tpm_get_pub_key_oiap(uint32_t key_handle, const void *usage_auth,
void *pubkey, size_t *pubkey_len);
+/**
+ * Get the TPM permanent flags value
+ *
+ * @param pflags Place to put permanent flags
+ * @return return code of the operation
+ */
+uint32_t tpm_get_permanent_flags(struct tpm_permanent_flags *pflags);
+
+/**
+ * Get the TPM permissions
+ *
+ * @param perm Returns permissions value
+ * @return return code of the operation
+ */
+uint32_t tpm_get_permissions(uint32_t index, uint32_t *perm);
+
#endif /* __TPM_H */
diff --git a/lib/tpm.c b/lib/tpm.c
index 19bf0b5..5d5f707 100644
--- a/lib/tpm.c
+++ b/lib/tpm.c
@@ -18,7 +18,6 @@
/* Useful constants */
enum {
COMMAND_BUFFER_SIZE = 256,
- TPM_PUBEK_SIZE = 256,
TPM_REQUEST_HEADER_LENGTH = 10,
TPM_RESPONSE_HEADER_LENGTH = 10,
PCR_DIGEST_LENGTH = 20,
@@ -610,6 +609,56 @@ uint32_t tpm_get_capability(uint32_t cap_area, uint32_t
sub_cap,
return 0;
}
+uint32_t tpm_get_permanent_flags(struct tpm_permanent_flags *pflags)
+{
+ const uint8_t command[22] = {
+ 0x0, 0xc1, /* TPM_TAG */
+ 0x0, 0x0, 0x0, 0x16, /* parameter size */
+ 0x0, 0x0, 0x0, 0x65, /* TPM_COMMAND_CODE */
+ 0x0, 0x0, 0x0, 0x4, /* TPM_CAP_FLAG_PERM */
+ 0x0, 0x0, 0x0, 0x4, /* subcap size */
+ 0x0, 0x0, 0x1, 0x8, /* subcap value */
+ };
+ uint8_t response[COMMAND_BUFFER_SIZE];
+ size_t response_length = sizeof(response);
+ uint32_t err;
+
+ err = tpm_sendrecv_command(command, response, &response_length);
+ if (err)
+ return err;
+ memcpy(pflags, response + TPM_HEADER_SIZE, sizeof(*pflags));
+
+ return 0;
+}
+
+uint32_t tpm_get_permissions(uint32_t index, uint32_t *perm)
+{
+ const uint8_t command[22] = {
+ 0x0, 0xc1, /* TPM_TAG */
+ 0x0, 0x0, 0x0, 0x16, /* parameter size */
+ 0x0, 0x0, 0x0, 0x65, /* TPM_COMMAND_CODE */
+ 0x0, 0x0, 0x0, 0x11,
+ 0x0, 0x0, 0x0, 0x4,
+ };
+ const size_t index_offset = 18;
+ const size_t perm_offset = 60;
+ uint8_t buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE];
+ size_t response_length = sizeof(response);
+ uint32_t err;
+
+ if (pack_byte_string(buf, sizeof(buf), "d", 0, command, sizeof(command),
+ index_offset, index))
+ return TPM_LIB_ERROR;
+ err = tpm_sendrecv_command(buf, response, &response_length);
+ if (err)
+ return err;
+ if (unpack_byte_string(response, response_length, "d",
+ perm_offset, perm))
+ return TPM_LIB_ERROR;
+
+ return 0;
+}
+
#ifdef CONFIG_TPM_AUTH_SESSIONS
/**
