sandbox: tpm: Support the define-space command

Add support for this command, moving away from the previous approach of
hard-coding the initial data in the driver, now that the kernel-space data
has to be set up by the higher-level vboot code.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/tpm/sandbox_common.c

@@ -64,3 +64,14 @@ void sb_tpm_write_data(struct nvdata_state nvdata[NV_SEQ_COUNT],
 	else
 		memcpy(&nvdata[seq].data, buf + data_ofs, length);
 }
+
+void sb_tpm_define_data(struct nvdata_state nvdata[NV_SEQ_COUNT],
+			enum sandbox_nv_space seq, int length)
+{
+	struct nvdata_state *nvd = &nvdata[seq];
+
+	if (length > NV_DATA_SIZE)
+		log_err("Invalid length %x (max %x)\n", length, NV_DATA_SIZE);
+	nvd->length = length;
+	nvd->present = true;
+}

drivers/tpm/sandbox_common.h

@@ -93,4 +93,16 @@ void sb_tpm_write_data(struct nvdata_state nvdata[NV_SEQ_COUNT],
 		       enum sandbox_nv_space seq, const u8 *buf, int data_ofs,
 		       int length);
 
+/**
+ * sb_tpm_define_data() - Set up non-volatile data
+ *
+ * If @length is too large, an error is logged and nothing is written.
+ *
+ * @nvdata: Current nvdata state
+ * @seq: Sequence number to set up
+ * @length: Length of space in bytes
+ */
+void sb_tpm_define_data(struct nvdata_state nvdata[NV_SEQ_COUNT],
+			enum sandbox_nv_space seq, int length);
+
 #endif

drivers/tpm/tpm_tis_sandbox.c

@@ -210,6 +210,17 @@ static int sandbox_tpm_xfer(struct udevice *dev, const uint8_t *sendbuf,
 		memset(recvbuf, '\0', *recv_len);
 		break;
 	case TPM_CMD_NV_DEFINE_SPACE:
+		index = get_unaligned_be32(sendbuf + 12);
+		length = get_unaligned_be32(sendbuf + 77);
+		seq = sb_tpm_index_to_seq(index);
+		if (seq < 0)
+			return -EINVAL;
+		printf("tpm: define_space index=%#02x, len=%#02x, seq=%#02x\n",
+		       index, length, seq);
+		sb_tpm_define_data(tpm->nvdata, seq, length);
+		*recv_len = 12;
+		memset(recvbuf, '\0', *recv_len);
+		break;
 	case 0x15: /* pcr read */
 	case 0x5d: /* force clear */
 	case 0x6f: /* physical enable */