tpm: add TPM2_Startup command support

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>
Reviewed-by: Tom Rini <trini@konsulko.com>

diff --git a/cmd/tpm-v2.c b/cmd/tpm-v2.c
index 8564aba..8589dae 100644 (file)
--- 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 fac0808..a9c604d 100644 (file)
--- 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 35dee03..1a81177 100644 (file)
--- 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;
+}