feat(drtm): add DRTM parameters structure version check

Added DRTM parameters structure version check that as per
the current released DRTM specification [1].

Mainly to cater below mentioned in the specification [1]
section 3.12 -
For a given DRTM major version number this structure will
always be extended in a backwards compatible manner.

[1]: https://developer.arm.com/documentation/den0113/a

Change-Id: I9f312c7f9f20152c5d7e40a22b462c7fe8db70bc
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>

services/std_svc/drtm/drtm_main.c

@@ -366,9 +366,10 @@ static enum drtm_retc drtm_dl_check_args(uint64_t x1,
 	}
 	a = &args_buf;
 
-	if (a->version != 1) {
-		ERROR("DRTM: parameters structure incompatible with major version %d\n",
-		      ARM_DRTM_VERSION_MAJOR);
+	if (!((a->version >= ARM_DRTM_PARAMS_MIN_VERSION) &&
+	    (a->version <= ARM_DRTM_PARAMS_MAX_VERSION))) {
+		ERROR("DRTM: parameters structure version %u is unsupported\n",
+		      a->version);
 		return NOT_SUPPORTED;
 	}
 

services/std_svc/drtm/drtm_main.h

@@ -36,6 +36,12 @@
 #define DL_ARGS_GET_DLME_ENTRY_POINT(a)	\
 		(((a)->dlme_paddr + (a)->dlme_img_off + (a)->dlme_img_ep_off))
 
+/*
+ * Range(Min/Max) of DRTM parameter structure versions supported
+ */
+#define ARM_DRTM_PARAMS_MIN_VERSION	U(1)
+#define ARM_DRTM_PARAMS_MAX_VERSION	U(1)
+
 enum drtm_dlme_el {
 	DLME_AT_EL1 = MODE_EL1,
 	DLME_AT_EL2 = MODE_EL2