diff options
Diffstat (limited to 'cmd/tpm-v2.c')
| -rw-r--r-- | cmd/tpm-v2.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/cmd/tpm-v2.c b/cmd/tpm-v2.c index 0a7a5c8074..ea2da97e2a 100644 --- a/cmd/tpm-v2.c +++ b/cmd/tpm-v2.c @@ -106,6 +106,44 @@ static int do_tpm2_pcr_extend(cmd_tbl_t *cmdtp, int flag, int argc, return report_return_code(rc); } +static int do_tpm_pcr_read(cmd_tbl_t *cmdtp, int flag, int argc, + char * const argv[]) +{ + struct udevice *dev; + struct tpm_chip_priv *priv; + u32 index, rc; + unsigned int updates; + void *data; + int ret; + + if (argc != 3) + return CMD_RET_USAGE; + + ret = uclass_first_device_err(UCLASS_TPM, &dev); + if (ret) + return ret; + + priv = dev_get_uclass_priv(dev); + if (!priv) + return -EINVAL; + + index = simple_strtoul(argv[1], NULL, 0); + if (index >= priv->pcr_count) + return -EINVAL; + + data = map_sysmem(simple_strtoul(argv[2], NULL, 0), 0); + + rc = tpm2_pcr_read(index, priv->pcr_select_min, data, &updates); + if (!rc) { + printf("PCR #%u content (%d known updates):\n", index, updates); + print_byte_string(data, TPM2_DIGEST_LEN); + } + + unmap_sysmem(data); + + return report_return_code(rc); +} + static cmd_tbl_t tpm2_commands[] = { U_BOOT_CMD_MKENT(info, 0, 1, do_tpm_info, "", ""), U_BOOT_CMD_MKENT(init, 0, 1, do_tpm_init, "", ""), @@ -113,6 +151,7 @@ static cmd_tbl_t tpm2_commands[] = { U_BOOT_CMD_MKENT(self_test, 0, 1, do_tpm2_self_test, "", ""), U_BOOT_CMD_MKENT(clear, 0, 1, do_tpm2_clear, "", ""), U_BOOT_CMD_MKENT(pcr_extend, 0, 1, do_tpm2_pcr_extend, "", ""), + U_BOOT_CMD_MKENT(pcr_read, 0, 1, do_tpm_pcr_read, "", ""), }; cmd_tbl_t *get_tpm_commands(unsigned int *size) @@ -148,4 +187,8 @@ U_BOOT_CMD(tpm, CONFIG_SYS_MAXARGS, 1, do_tpm, "Issue a TPMv2.x command", " Extend PCR #<pcr> with digest at <digest_addr>.\n" " <pcr>: index of the PCR\n" " <digest_addr>: address of a 32-byte SHA256 digest\n" +"pcr_read <pcr> <digest_addr>\n" +" Read PCR #<pcr> to memory address <digest_addr>.\n" +" <pcr>: index of the PCR\n" +" <digest_addr>: address to store the a 32-byte SHA256 digest\n" ); |