[SeaBIOS] [PATCH] Ignore certain error when asserting physical presence

[Stefan Berger]

Some hardware TPMs do not support the assertion of physical presence
via the command. Ignore the specific error code TPM_BAD_PARAMETER if
we come across such a device.

Signed-off-by: Stefan Berger 
---
 src/tcgbios.c | 3 ++-
 src/tcgbios.h | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/tcgbios.c b/src/tcgbios.c
index 4cda800..04904e3 100644
--- a/src/tcgbios.c
+++ b/src/tcgbios.c
@@ -517,7 +517,8 @@ tpm_leave_bios(void)
                             PhysicalPresence_CMD_ENABLE,
                             sizeof(PhysicalPresence_CMD_ENABLE),
                             NULL, 10, &returnCode, TPM_DURATION_TYPE_SHORT);
-    if (rc || returnCode)
+    /* some TPMs do not support phys. presence enablement */
+    if (rc || (returnCode && returnCode != TPM_BAD_PARAMETER))
         goto err_exit;

rc = build_and_send_cmd(0, TPM_ORD_PhysicalPresence,
diff --git a/src/tcgbios.h b/src/tcgbios.h
index 332d785..72fd771 100644
--- a/src/tcgbios.h
+++ b/src/tcgbios.h
@@ -88,6 +88,7 @@

/* TPM command error codes */
+#define TPM_BAD_PARAMETER                0x3
 #define TPM_INVALID_POSTINIT             0x26
 #define TPM_BAD_LOCALITY                 0x3d