This patch adds a function to the TPM library, which allows U-Boot to
flush resources, e.g. keys, from the TPM.
Signed-off-by: Mario Six <mario....@gdsys.cc>
---
board/gdsys/p1022/controlcenterd-id.c | 9 -------
include/tpm.h | 45 +++++++++++++++++++++++++++++++++++
lib/tpm.c | 28 ++++++++++++++++++++++
3 files changed, 73 insertions(+), 9 deletions(-)
diff --git a/board/gdsys/p1022/controlcenterd-id.c
b/board/gdsys/p1022/controlcenterd-id.c
index 2c6c698..1648f13 100644
--- a/board/gdsys/p1022/controlcenterd-id.c
+++ b/board/gdsys/p1022/controlcenterd-id.c
@@ -43,15 +43,6 @@
#define CCDM_AUTO_FIRST_STAGE
#endif
-/* enums from TCG specs */
-enum {
- /* capability areas */
- TPM_CAP_NV_INDEX = 0x00000011,
- TPM_CAP_HANDLE = 0x00000014,
- /* resource types */
- TPM_RT_KEY = 0x00000001,
-};
-
/* CCDM specific contants */
enum {
/* NV indices */
diff --git a/include/tpm.h b/include/tpm.h
index 9a6585d..800f29c 100644
--- a/include/tpm.h
+++ b/include/tpm.h
@@ -47,6 +47,42 @@ enum tpm_nv_index {
TPM_NV_INDEX_DIR = 0x10000001,
};
+enum tpm_resource_type {
+ TPM_RT_KEY = 0x00000001,
+ TPM_RT_AUTH = 0x00000002,
+ TPM_RT_HASH = 0x00000003,
+ TPM_RT_TRANS = 0x00000004,
+ TPM_RT_CONTEXT = 0x00000005,
+ TPM_RT_COUNTER = 0x00000006,
+ TPM_RT_DELEGATE = 0x00000007,
+ TPM_RT_DAA_TPM = 0x00000008,
+ TPM_RT_DAA_V0 = 0x00000009,
+ TPM_RT_DAA_V1 = 0x0000000A,
+};
+
+enum tpm_capability_areas {
+ TPM_CAP_ORD = 0x00000001,
+ TPM_CAP_ALG = 0x00000002,
+ TPM_CAP_PID = 0x00000003,
+ TPM_CAP_FLAG = 0x00000004,
+ TPM_CAP_PROPERTY = 0x00000005,
+ TPM_CAP_VERSION = 0x00000006,
+ TPM_CAP_KEY_HANDLE = 0x00000007,
+ TPM_CAP_CHECK_LOADED = 0x00000008,
+ TPM_CAP_SYM_MODE = 0x00000009,
+ TPM_CAP_KEY_STATUS = 0x0000000C,
+ TPM_CAP_NV_LIST = 0x0000000D,
+ TPM_CAP_MFR = 0x00000010,
+ TPM_CAP_NV_INDEX = 0x00000011,
+ TPM_CAP_TRANS_ALG = 0x00000012,
+ TPM_CAP_HANDLE = 0x00000014,
+ TPM_CAP_TRANS_ES = 0x00000015,
+ TPM_CAP_AUTH_ENCRYPT = 0x00000017,
+ TPM_CAP_SELECT_SIZE = 0x00000018,
+ TPM_CAP_DA_LOGIC = 0x00000019,
+ TPM_CAP_VERSION_VAL = 0x0000001A,
+};
+
#define TPM_NV_PER_GLOBALLOCK (1U << 15)
#define TPM_NV_PER_PPWRITE (1U << 0)
#define TPM_NV_PER_READ_STCLEAR (1U << 31)
@@ -594,4 +630,13 @@ uint32_t tpm_get_permanent_flags(struct
tpm_permanent_flags *pflags);
*/
uint32_t tpm_get_permissions(uint32_t index, uint32_t *perm);
+/**
+ * Flush a resource with a given handle and type from the TPM
+ *
+ * @param key_handle handle of the resource
+ * @param resource_type type of the resource
+ * @return return code of the operation
+ */
+uint32_t tpm_flush_specific(uint32_t key_handle, uint32_t resource_type);
+
#endif /* __TPM_H */
diff --git a/lib/tpm.c b/lib/tpm.c
index 88f2406..98c20a0 100644
--- a/lib/tpm.c
+++ b/lib/tpm.c
@@ -645,6 +645,34 @@ uint32_t tpm_get_permissions(uint32_t index, uint32_t
*perm)
return 0;
}
+uint32_t tpm_flush_specific(uint32_t key_handle, uint32_t resource_type)
+{
+ const uint8_t command[18] = {
+ 0x00, 0xc1, /* TPM_TAG */
+ 0x00, 0x00, 0x00, 0x12, /* parameter size */
+ 0x00, 0x00, 0x00, 0xba, /* TPM_COMMAND_CODE */
+ 0x00, 0x00, 0x00, 0x00, /* key handle */
+ 0x00, 0x00, 0x00, 0x00, /* resource type */
+ };
+ const size_t key_handle_offset = 10;
+ const size_t resource_type_offset = 14;
+
+ 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), "sdd",
+ 0, command, sizeof(command),
+ key_handle_offset, key_handle,
+ resource_type_offset, resource_type))
+ return TPM_LIB_ERROR;
+
+ err = tpm_sendrecv_command(buf, response, &response_length);
+ if (err)
+ return err;
+ return 0;
+}
+
#ifdef CONFIG_TPM_AUTH_SESSIONS
/**
--
2.9.0
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