tpm: Add TPM2 support for read/write values
Implement this API function for TPM2.
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/include/tpm-common.h b/include/tpm-common.h
index c1309a2..998b4fb 100644
--- a/include/tpm-common.h
+++ b/include/tpm-common.h
@@ -55,6 +55,8 @@
* @buf: Buffer used during the exchanges with the chip
* @pcr_count: Number of PCR per bank
* @pcr_select_min: Minimum size in bytes of the pcrSelect array
+ * @plat_hier_disabled: Platform hierarchy has been disabled (TPM is locked
+ * down until next reboot)
*/
struct tpm_chip_priv {
enum tpm_version version;
@@ -66,6 +68,7 @@
/* TPM v2 specific data */
uint pcr_count;
uint pcr_select_min;
+ bool plat_hier_disabled;
};
/**
diff --git a/include/tpm-v2.h b/include/tpm-v2.h
index aa8b651..b73a2d2 100644
--- a/include/tpm-v2.h
+++ b/include/tpm-v2.h
@@ -242,6 +242,7 @@
TPM2_CC_HIERCHANGEAUTH = 0x0129,
TPM2_CC_NV_DEFINE_SPACE = 0x012a,
TPM2_CC_PCR_SETAUTHPOL = 0x012C,
+ TPM2_CC_NV_WRITE = 0x0137,
TPM2_CC_DAM_RESET = 0x0139,
TPM2_CC_DAM_PARAMETERS = 0x013A,
TPM2_CC_NV_READ = 0x014E,
@@ -356,6 +357,20 @@
TPM_MAX_BUF_SIZE = 1260,
};
+enum {
+ /* Secure storage for firmware settings */
+ TPM_HT_PCR = 0,
+ TPM_HT_NV_INDEX,
+ TPM_HT_HMAC_SESSION,
+ TPM_HT_POLICY_SESSION,
+
+ HR_SHIFT = 24,
+ HR_PCR = TPM_HT_PCR << HR_SHIFT,
+ HR_HMAC_SESSION = TPM_HT_HMAC_SESSION << HR_SHIFT,
+ HR_POLICY_SESSION = TPM_HT_POLICY_SESSION << HR_SHIFT,
+ HR_NV_INDEX = TPM_HT_NV_INDEX << HR_SHIFT,
+};
+
/**
* Issue a TPM2_Startup command.
*
@@ -421,6 +436,29 @@
const u8 *digest, u32 digest_len);
/**
+ * Read data from the secure storage
+ *
+ * @dev TPM device
+ * @index Index of data to read
+ * @data Place to put data
+ * @count Number of bytes of data
+ * @return code of the operation
+ */
+u32 tpm2_nv_read_value(struct udevice *dev, u32 index, void *data, u32 count);
+
+/**
+ * Write data to the secure storage
+ *
+ * @dev TPM device
+ * @index Index of data to write
+ * @data Data to write
+ * @count Number of bytes of data
+ * @return code of the operation
+ */
+u32 tpm2_nv_write_value(struct udevice *dev, u32 index, const void *data,
+ u32 count);
+
+/**
* Issue a TPM2_PCR_Read command.
*
* @dev TPM device