[U-Boot] [PATCH v4 16/32] tpm: add TPM2_Startup command support

Miquel Raynal
2018-05-15T09:57:12Z

Add support for the TPM2_Startup command.

Change the command file and the help accordingly.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
cmd/tpm-v2.c | 26 ++++++++++++++++++++++++++
include/tpm-v2.h | 9 +++++++++
lib/tpm-v2.c | 21 +++++++++++++++++++++
3 files changed, 56 insertions(+)

diff --git a/cmd/tpm-v2.c b/cmd/tpm-v2.c
index 606aa92409..d11820404e 100644
--- a/cmd/tpm-v2.c
+++ b/cmd/tpm-v2.c
@@ -11,9 +11,30 @@
#include <tpm-v2.h>
#include "tpm-user-utils.h"

+static int do_tpm2_startup(cmd_tbl_t *cmdtp, int flag, int argc,
+ char * const argv[])
+{
+ enum tpm2_startup_types mode;
+
+ if (argc != 2)
+ return CMD_RET_USAGE;
+
+ if (!strcasecmp("TPM2_SU_CLEAR", argv[1])) {
+ mode = TPM2_SU_CLEAR;
+ } else if (!strcasecmp("TPM2_SU_STATE", argv[1])) {
+ mode = TPM2_SU_STATE;
+ } else {
+ printf("Couldn't recognize mode string: %s\n", argv[1]);
+ return CMD_RET_FAILURE;
+ }
+
+ return report_return_code(tpm2_startup(mode));
+}
+
static cmd_tbl_t tpm2_commands[] = {
U_BOOT_CMD_MKENT(info, 0, 1, do_tpm_info, "", ""),
U_BOOT_CMD_MKENT(init, 0, 1, do_tpm_init, "", ""),
+ U_BOOT_CMD_MKENT(startup, 0, 1, do_tpm2_startup, "", ""),
};

cmd_tbl_t *get_tpm_commands(unsigned int *size)
@@ -30,4 +51,9 @@ U_BOOT_CMD(tpm, CONFIG_SYS_MAXARGS, 1, do_tpm, "Issue a TPMv2.x command",
" Show information about the TPM.\n"
"init\n"
" Initialize the software stack. Always the first command to issue.\n"
+"startup <mode>\n"
+" Issue a TPM2_Startup command.\n"
+" <mode> is one of:\n"
+" * TPM2_SU_CLEAR (reset state)\n"
+" * TPM2_SU_STATE (preserved state)\n"
);
diff --git a/include/tpm-v2.h b/include/tpm-v2.h
index 09a7a8b183..b9d6488b4c 100644
--- a/include/tpm-v2.h
+++ b/include/tpm-v2.h
@@ -125,4 +125,13 @@ enum tpm2_algorithms {
TPM2_ALG_NULL = 0x10,
};

+/**
+ * Issue a TPM2_Startup command.
+ *
+ * @mode TPM startup mode
+ *
+ * @return code of the operation
+ */
+u32 tpm2_startup(enum tpm2_startup_types mode);
+
#endif /* __TPM_V2_H */
diff --git a/lib/tpm-v2.c b/lib/tpm-v2.c
index ef4ebcd8ac..0d5ecebd32 100644
--- a/lib/tpm-v2.c
+++ b/lib/tpm-v2.c
@@ -9,3 +9,24 @@
#include <tpm-common.h>
#include <tpm-v2.h>
#include "tpm-utils.h"
+
+u32 tpm2_startup(enum tpm2_startup_types mode)
+{
+ const u8 command_v2[12] = {
+ tpm_u16(TPM2_ST_NO_SESSIONS),
+ tpm_u32(12),
+ tpm_u32(TPM2_CC_STARTUP),
+ tpm_u16(mode),
+ };
+ int ret;
+
+ /*
+ * Note TPM2_Startup command will return RC_SUCCESS the first time,
+ * but will return RC_INITIALIZE otherwise.
+ */
+ ret = tpm_sendrecv_command(command_v2, NULL, NULL);
+ if (ret && ret != TPM2_RC_INITIALIZE)
+ return ret;
+
+ return 0;
+}
--
2.14.1