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tpm: Add TPM2 support for write_lock

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Implement this API function for TPM2.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Simon Glass 2021-02-06 14:23:41 -07:00 committed by Tom Rini
parent 6719cbe31a
commit 7785bc1d5f
3 changed files with 36 additions and 1 deletions
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12
include/tpm-v2.h
View file

@ -243,6 +243,7 @@ enum tpm2_command_codes {
TPM2_CC_NV_DEFINE_SPACE = 0x012a,
TPM2_CC_PCR_SETAUTHPOL = 0x012C,
TPM2_CC_NV_WRITE = 0x0137,
TPM2_CC_NV_WRITELOCK = 0x0138,
TPM2_CC_DAM_RESET = 0x0139,
TPM2_CC_DAM_PARAMETERS = 0x013A,
TPM2_CC_NV_READ = 0x014E,
@ -572,4 +573,15 @@ u32 tpm2_pcr_setauthvalue(struct udevice *dev, const char *pw,
*/
u32 tpm2_get_random(struct udevice *dev, void *data, u32 count);
/**
* Lock data in the TPM
*
* Once locked the data cannot be written until after a reboot
*
* @dev TPM device
* @index Index of data to lock
* @return code of the operation
*/
u32 tpm2_write_lock(struct udevice *dev, u32 index);
#endif /* __TPM_V2_H */

23
lib/tpm-v2.c
View file

@ -601,3 +601,26 @@ u32 tpm2_get_random(struct udevice *dev, void *data, u32 count)
return 0;
}
u32 tpm2_write_lock(struct udevice *dev, u32 index)
{
u8 command_v2[COMMAND_BUFFER_SIZE] = {
/* header 10 bytes */
tpm_u16(TPM2_ST_SESSIONS), /* TAG */
tpm_u32(10 + 8 + 13), /* Length */
tpm_u32(TPM2_CC_NV_WRITELOCK), /* Command code */
/* handles 8 bytes */
tpm_u32(TPM2_RH_PLATFORM), /* Primary platform seed */
tpm_u32(HR_NV_INDEX + index), /* Password authorisation */
/* session header 9 bytes */
tpm_u32(9), /* Header size */
tpm_u32(TPM2_RS_PW), /* Password authorisation */
tpm_u16(0), /* nonce_size */
0, /* session_attrs */
tpm_u16(0), /* auth_size */
};
return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}

2
lib/tpm_api.c
View file

@ -144,7 +144,7 @@ u32 tpm_write_lock(struct udevice *dev, u32 index)
if (is_tpm1(dev))
return -ENOSYS;
else if (is_tpm2(dev))
return -ENOSYS;
return tpm2_write_lock(dev, index);
else
return -ENOSYS;
}