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[1/2,v5] tpm: Add some headers from the spec

Message ID 20201112222210.876652-1-ilias.apalodimas@linaro.org
State Accepted
Commit 915e3ae5682dc41b32818e918b20c9aea0ba8076
Headers show
Series [1/2,v5] tpm: Add some headers from the spec | expand

Commit Message

Ilias Apalodimas Nov. 12, 2020, 10:22 p.m. UTC 
A following patch introduces EFI_TCG2_PROTOCOL.
Add the required TPMv2 headers to support it.

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

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

---
* changes since v3:
- Add TPM2 prefix on PT_GROUP, PT_FIXED
* changes since v2:
- Added description and pointers to TCG specs
- updated copyright info
 include/tpm-v2.h | 77 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)

-- 
2.29.2
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Patch

diff --git a/include/tpm-v2.h b/include/tpm-v2.h
index f6c045d35480..74c14fe7c51d 100644
--- a/include/tpm-v2.h
+++ b/include/tpm-v2.h
@@ -1,6 +1,13 @@ 
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
+ * Defines APIs and structures that allow software to interact with a
+ * TPM2 device
+ *
+ * Copyright (c) 2020 Linaro
  * Copyright (c) 2018 Bootlin
+ *
+ * https://trustedcomputinggroup.org/resource/tss-overview-common-structures-specification/
+ *
  * Author: Miquel Raynal <miquel.raynal@bootlin.com>
  */
 
@@ -11,6 +18,74 @@ 
 
 #define TPM2_DIGEST_LEN		32
 
+#define TPM2_MAX_PCRS 32
+#define TPM2_PCR_SELECT_MAX ((TPM2_MAX_PCRS + 7) / 8)
+#define TPM2_MAX_CAP_BUFFER 1024
+#define TPM2_MAX_TPM_PROPERTIES ((TPM2_MAX_CAP_BUFFER - sizeof(u32) /* TPM2_CAP */ - \
+				 sizeof(u32)) / sizeof(struct tpms_tagged_property))
+
+/*
+ *  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
+ *  implementations that have enabled a larger than typical number of PCR
+ *  banks. This larger value for TPM2_NUM_PCR_BANKS is expected to be included
+ *  in a future revision of the specification.
+ */
+#define TPM2_NUM_PCR_BANKS 16
+
+/* Definition of (UINT32) TPM2_CAP Constants */
+#define TPM2_CAP_PCRS 0x00000005U
+#define TPM2_CAP_TPM_PROPERTIES 0x00000006U
+
+/* Definition of (UINT32) TPM2_PT Constants */
+#define TPM2_PT_GROUP			(u32)(0x00000100)
+#define TPM2_PT_FIXED			(u32)(TPM2_PT_GROUP * 1)
+#define TPM2_PT_MANUFACTURER		(u32)(TPM2_PT_FIXED + 5)
+#define TPM2_PT_PCR_COUNT		(u32)(TPM2_PT_FIXED + 18)
+#define TPM2_PT_MAX_COMMAND_SIZE	(u32)(TPM2_PT_FIXED + 30)
+#define TPM2_PT_MAX_RESPONSE_SIZE	(u32)(TPM2_PT_FIXED + 31)
+
+/* TPMS_TAGGED_PROPERTY Structure */
+struct tpms_tagged_property {
+	u32 property;
+	u32 value;
+} __packed;
+
+/* TPMS_PCR_SELECTION Structure */
+struct tpms_pcr_selection {
+	u16 hash;
+	u8 size_of_select;
+	u8 pcr_select[TPM2_PCR_SELECT_MAX];
+} __packed;
+
+/* TPML_PCR_SELECTION Structure */
+struct tpml_pcr_selection {
+	u32 count;
+	struct tpms_pcr_selection selection[TPM2_NUM_PCR_BANKS];
+} __packed;
+
+/* TPML_TAGGED_TPM_PROPERTY Structure */
+struct tpml_tagged_tpm_property {
+	u32 count;
+	struct tpms_tagged_property tpm_property[TPM2_MAX_TPM_PROPERTIES];
+} __packed;
+
+/* TPMU_CAPABILITIES Union */
+union tpmu_capabilities {
+	/*
+	 * Non exhaustive. Only added the structs needed for our
+	 * current code
+	 */
+	struct tpml_pcr_selection assigned_pcr;
+	struct tpml_tagged_tpm_property tpm_properties;
+} __packed;
+
+/* TPMS_CAPABILITY_DATA Structure */
+struct tpms_capability_data {
+	u32 capability;
+	union tpmu_capabilities data;
+} __packed;
+
 /**
  * TPM2 Structure Tags for command/response buffers.
  *
@@ -123,11 +198,13 @@  enum tpm2_return_codes {
  * TPM2 algorithms.
  */
 enum tpm2_algorithms {
+	TPM2_ALG_SHA1		= 0x04,
 	TPM2_ALG_XOR		= 0x0A,
 	TPM2_ALG_SHA256		= 0x0B,
 	TPM2_ALG_SHA384		= 0x0C,
 	TPM2_ALG_SHA512		= 0x0D,
 	TPM2_ALG_NULL		= 0x10,
+	TPM2_ALG_SM3_256	= 0x12,
 };
 
 /* NV index attributes */