[U-Boot] [PATCH v4 13/32] tpm: add macros to enhance TPM commands readability

Miquel Raynal
2018-05-15T09:57:09Z

TPM commands are much easier to read/write with these macros that will
transform words or integers into byte strings. This way, there is no
need to call pack_byte_string() while all variable length in a command
are known (and at must 4 bytes, which is a lot of them).

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
lib/tpm-utils.h | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/lib/tpm-utils.h b/lib/tpm-utils.h
index 429da46232..9c875e6fa7 100644
--- a/lib/tpm-utils.h
+++ b/lib/tpm-utils.h
@@ -13,6 +13,12 @@
/* Internal error of TPM command library */
#define TPM_LIB_ERROR ((u32)~0u)

+/* To make strings of commands more easily */
+#define __MSB(x) ((x) >> 8)
+#define __LSB(x) ((x) & 0xFF)
+#define tpm_u16(x) __MSB(x), __LSB(x)
+#define tpm_u32(x) tpm_u16((x) >> 16), tpm_u16((x) & 0xFFFF)
+
/**
* tpm_open() - Request access to locality 0 for the caller
*
--
2.14.1