tpm: add tpm_cmd_get_size() to tpm_util

The function is generally useful and used in the following patches.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/hw/tpm/tpm_util.h b/hw/tpm/tpm_util.h
index 2f7c96146d..aca10c97bf 100644
--- a/hw/tpm/tpm_util.h
+++ b/hw/tpm/tpm_util.h
@@ -22,7 +22,8 @@
 #ifndef TPM_TPM_UTIL_H
 #define TPM_TPM_UTIL_H
 
-#include "sysemu/tpm_backend.h"
+#include "sysemu/tpm.h"
+#include "qemu/bswap.h"
 
 void tpm_util_write_fatal_error_response(uint8_t *out, uint32_t out_len);
 
@@ -30,4 +31,9 @@ bool tpm_util_is_selftest(const uint8_t *in, uint32_t in_len);
 
 int tpm_util_test_tpmdev(int tpm_fd, TPMVersion *tpm_version);
 
+static inline uint32_t tpm_cmd_get_size(const void *b)
+{
+    return be32_to_cpu(*(const uint32_t *)(b + 2));
+}
+
 #endif /* TPM_TPM_UTIL_H */