tpm: add macros to enhance TPM commands readability

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 <[email protected]> Reviewed-by: Simon Glass <[email protected]> Reviewed-by: Tom Rini <[email protected]>
koenkooi · May 26, 2018 · f687281 · f687281
1 parent ff32245
commit f687281
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/lib/tpm-utils.h b/lib/tpm-utils.h
@@ -12,6 +12,12 @@
 /* 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
  *