tpm: add TPM2_GetCapability command support
Add support for the TPM2_GetCapability 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 ea2da97..298669b 100644
--- a/cmd/tpm-v2.c
+++ b/cmd/tpm-v2.c
@@ -144,6 +144,43 @@
return report_return_code(rc);
}
+static int do_tpm_get_capability(cmd_tbl_t *cmdtp, int flag, int argc,
+ char * const argv[])
+{
+ u32 capability, property, rc;
+ u8 *data;
+ size_t count;
+ int i, j;
+
+ if (argc != 5)
+ return CMD_RET_USAGE;
+
+ capability = simple_strtoul(argv[1], NULL, 0);
+ property = simple_strtoul(argv[2], NULL, 0);
+ data = map_sysmem(simple_strtoul(argv[3], NULL, 0), 0);
+ count = simple_strtoul(argv[4], NULL, 0);
+
+ rc = tpm2_get_capability(capability, property, data, count);
+ if (rc)
+ goto unmap_data;
+
+ printf("Capabilities read from TPM:\n");
+ for (i = 0; i < count; i++) {
+ printf("Property 0x");
+ for (j = 0; j < 4; j++)
+ printf("%02x", data[(i * 8) + j]);
+ printf(": 0x");
+ for (j = 4; j < 8; j++)
+ printf("%02x", data[(i * 8) + j]);
+ printf("\n");
+ }
+
+unmap_data:
+ unmap_sysmem(data);
+
+ return report_return_code(rc);
+}
+
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, "", ""),
@@ -152,6 +189,7 @@
U_BOOT_CMD_MKENT(clear, 0, 1, do_tpm2_clear, "", ""),
U_BOOT_CMD_MKENT(pcr_extend, 0, 1, do_tpm2_pcr_extend, "", ""),
U_BOOT_CMD_MKENT(pcr_read, 0, 1, do_tpm_pcr_read, "", ""),
+ U_BOOT_CMD_MKENT(get_capability, 0, 1, do_tpm_get_capability, "", ""),
};
cmd_tbl_t *get_tpm_commands(unsigned int *size)
@@ -191,4 +229,11 @@
" Read PCR #<pcr> to memory address <digest_addr>.\n"
" <pcr>: index of the PCR\n"
" <digest_addr>: address to store the a 32-byte SHA256 digest\n"
+"get_capability <capability> <property> <addr> <count>\n"
+" Read and display <count> entries indexed by <capability>/<property>.\n"
+" Values are 4 bytes long and are written at <addr>.\n"
+" <capability>: capability\n"
+" <property>: property\n"
+" <addr>: address to store <count> entries of 4 bytes\n"
+" <count>: number of entries to retrieve\n"
);