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ieee1275/tcg2: Refactor grub_ieee1275_tpm_init()

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Move tpm_get_tpm_version() into grub_ieee1275_tpm_init() and invalidate
grub_ieee1275_tpm_ihandle in case no TPM 2 could be detected. Try the
initialization only once so that grub_tpm_present() will always return
the same result. Use the grub_ieee1275_tpm_ihandle as indicator for an
available TPM instead of grub_ieee1275_tpm_version, which can now be
removed.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Stefan Berger authored and Daniel Kiper committed 2024-11-28 22:37:50 +01:00
1 parent 8c0b5f2003
commit 72092a8641
3 files changed
+18 -25
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grub-core/commands/ieee1275/ibmvtpm.c
+1 -1
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@@ -100,7 +100,7 @@ grub_tpm_measure (unsigned char *buf, grub_size_t size, grub_uint8_t pcr,
grub_dprintf ("tpm", "log_event, pcr = %d, size = 0x%" PRIxGRUB_SIZE ", %s\n",
pcr, size, description);
if (grub_ieee1275_tpm_version == 2)
if (grub_ieee1275_tpm_ihandle != GRUB_IEEE1275_IHANDLE_INVALID)
return tpm2_log_event (buf, size, pcr, description);
return GRUB_ERR_NONE;