sandbox: tpm: Support nvdata in TPM2

Add support for this feature in the TPM2 emulator, to support Chromium OS
vboot.

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

2 files changed, 70 insertions, 0 deletions

diff --git a/drivers/tpm/tpm2_tis_sandbox.c b/drivers/tpm/tpm2_tis_sandbox.c
index c287ca2..1d38a79 100644
--- a/drivers/tpm/tpm2_tis_sandbox.c
+++ b/drivers/tpm/tpm2_tis_sandbox.c
@@ -11,6 +11,7 @@
 #include <asm/unaligned.h>
 #include <linux/bitops.h>
 #include <u-boot/crc.h>
+#include "sandbox_common.h"
 
 /* Hierarchies */
 enum tpm2_hierarchy {
@@ -73,6 +74,7 @@ struct sandbox_tpm2 {
 	u32 properties[TPM2_PROPERTY_NB];
 	u8 pcr[SANDBOX_TPM_PCR_NB][TPM2_DIGEST_LEN];
 	u32 pcr_extensions[SANDBOX_TPM_PCR_NB];
+	struct nvdata_state nvdata[NV_SEQ_COUNT];
 };
 
 static struct sandbox_tpm2 s_state, *g_state;
@@ -109,6 +111,10 @@ static int sandbox_tpm2_check_session(struct udevice *dev, u32 command, u16 tag,
 	case TPM2_CC_DAM_RESET:
 	case TPM2_CC_DAM_PARAMETERS:
 	case TPM2_CC_PCR_EXTEND:
+	case TPM2_CC_NV_READ:
+	case TPM2_CC_NV_WRITE:
+	case TPM2_CC_NV_WRITELOCK:
+	case TPM2_CC_NV_DEFINE_SPACE:
 		if (tag != TPM2_ST_SESSIONS) {
 			printf("Session required for command 0x%x\n", command);
 			return TPM2_RC_AUTH_CONTEXT;
@@ -137,6 +143,10 @@ static int sandbox_tpm2_check_session(struct udevice *dev, u32 command, u16 tag,
 			break;
 		case TPM2_RH_PLATFORM:
 			*hierarchy = TPM2_HIERARCHY_PLATFORM;
+			if (command == TPM2_CC_NV_READ ||
+			    command == TPM2_CC_NV_WRITE ||
+			    command == TPM2_CC_NV_WRITELOCK)
+				*auth += sizeof(u32);
 			break;
 		default:
 			printf("Wrong handle 0x%x\n", handle);
@@ -573,6 +583,64 @@ static int sandbox_tpm2_xfer(struct udevice *dev, const u8 *sendbuf,
 		sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
 		break;
 
+	case TPM2_CC_NV_READ: {
+		int index, seq;
+
+		index = get_unaligned_be32(sendbuf + TPM2_HDR_LEN + 4);
+		length = get_unaligned_be16(sent);
+		/* ignore offset */
+		seq = sb_tpm_index_to_seq(index);
+		if (seq < 0)
+			return log_msg_ret("index", -EINVAL);
+		printf("tpm: nvread index=%#02x, len=%#02x, seq=%#02x\n", index,
+		       length, seq);
+		*recv_len = TPM2_HDR_LEN + 6 + length;
+		memset(recvbuf, '\0', *recv_len);
+		put_unaligned_be32(length, recvbuf + 2);
+		sb_tpm_read_data(tpm->nvdata, seq, recvbuf,
+				 TPM2_HDR_LEN + 4 + 2, length);
+		break;
+	}
+	case TPM2_CC_NV_WRITE: {
+		int index, seq;
+
+		index = get_unaligned_be32(sendbuf + TPM2_HDR_LEN + 4);
+		length = get_unaligned_be16(sent);
+		sent += sizeof(u16);
+
+		/* ignore offset */
+		seq = sb_tpm_index_to_seq(index);
+		if (seq < 0)
+			return log_msg_ret("index", -EINVAL);
+		printf("tpm: nvwrite index=%#02x, len=%#02x, seq=%#02x\n", index,
+		       length, seq);
+		memcpy(&tpm->nvdata[seq].data, sent, length);
+		tpm->nvdata[seq].present = true;
+		*recv_len = TPM2_HDR_LEN + 2;
+		memset(recvbuf, '\0', *recv_len);
+		break;
+	}
+	case TPM2_CC_NV_DEFINE_SPACE: {
+		int policy_size, index, seq;
+
+		policy_size = get_unaligned_be16(sent + 12);
+		index = get_unaligned_be32(sent + 2);
+		sent += 14 + policy_size;
+		length = get_unaligned_be16(sent);
+		seq = sb_tpm_index_to_seq(index);
+		if (seq < 0)
+			return -EINVAL;
+		printf("tpm: define_space index=%x, len=%x, seq=%x, policy_size=%x\n",
+		       index, length, seq, policy_size);
+		sb_tpm_define_data(tpm->nvdata, seq, length);
+		*recv_len = 12;
+		memset(recvbuf, '\0', *recv_len);
+		break;
+	}
+	case TPM2_CC_NV_WRITELOCK:
+		*recv_len = 12;
+		memset(recvbuf, '\0', *recv_len);
+		break;
 	default:
 		printf("TPM2 command %02x unknown in Sandbox\n", command);
 		rc = TPM2_RC_COMMAND_CODE;
diff --git a/include/tpm-v2.h b/include/tpm-v2.h
index 247b386..949a13c 100644
--- a/include/tpm-v2.h
+++ b/include/tpm-v2.h
@@ -32,6 +32,8 @@ struct udevice;
 #define TPM2_MAX_TPM_PROPERTIES ((TPM2_MAX_CAP_BUFFER - sizeof(u32) /* TPM2_CAP */ - \
 				 sizeof(u32)) / sizeof(struct tpms_tagged_property))
 
+#define TPM2_HDR_LEN		10
+
 /*
  *  We deviate from this draft of the specification by increasing the value of
  *  TPM2_NUM_PCR_BANKS from 3 to 16 to ensure compatibility with TPM2