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/lib/tpm-v2.c b/lib/tpm-v2.c
index 7d3834c..08e3ba7 100644
--- a/lib/tpm-v2.c
+++ b/lib/tpm-v2.c
@@ -157,3 +157,36 @@
return 0;
}
+
+u32 tpm2_get_capability(u32 capability, u32 property, void *buf,
+ size_t prop_count)
+{
+ u8 command_v2[COMMAND_BUFFER_SIZE] = {
+ tpm_u16(TPM2_ST_NO_SESSIONS), /* TAG */
+ tpm_u32(22), /* Length */
+ tpm_u32(TPM2_CC_GET_CAPABILITY), /* Command code */
+
+ tpm_u32(capability), /* Capability */
+ tpm_u32(property), /* Property */
+ tpm_u32(prop_count), /* Property count */
+ };
+ u8 response[COMMAND_BUFFER_SIZE];
+ size_t response_len = COMMAND_BUFFER_SIZE;
+ unsigned int properties_off;
+ int ret;
+
+ ret = tpm_sendrecv_command(command_v2, response, &response_len);
+ if (ret)
+ return ret;
+
+ /*
+ * In the response buffer, the properties are located after the:
+ * tag (u16), response size (u32), response code (u32),
+ * YES/NO flag (u8), TPM_CAP (u32) and TPMU_CAPABILITIES (u32).
+ */
+ properties_off = sizeof(u16) + sizeof(u32) + sizeof(u32) +
+ sizeof(u8) + sizeof(u32) + sizeof(u32);
+ memcpy(buf, &response[properties_off], response_len - properties_off);
+
+ return 0;
+}