diff --git a/include/lib/utils_def.h b/include/lib/utils_def.h
index 098506a..68e464a 100644
--- a/include/lib/utils_def.h
+++ b/include/lib/utils_def.h
@@ -58,12 +58,34 @@
 #define GENMASK				GENMASK_32
 #endif
 
+/*
+ * Similar to GENMASK_64 but uses a named register field to compute the mask.
+ * For a register field REG_FIELD, the macros REG_FIELD_WIDTH and
+ * REG_FIELD_SHIFT must be defined.
+ */
+#define MASK(regfield)							\
+	((~0ULL >> (64ULL - (regfield##_WIDTH))) << (regfield##_SHIFT))
+
 #define HI(addr)			(addr >> 32)
 #define LO(addr)			(addr & 0xffffffff)
 
 #define HI_64(addr)			(addr >> 64)
 #define LO_64(addr)			(addr & 0xffffffffffffffff)
 
+/**
+ * EXTRACT_FIELD - Extracts a specific bit field from a value.
+ *
+ * @reg:      The input value containing the field.
+
+ * @regfield: A bitmask representing the field. For a register field REG_FIELD,
+ *            the macros REG_FIELD_WIDTH and REG_FIELD_SHIFT must be defined.
+
+ * The result of this macro is the contents of the field right shifted to the
+ * least significant bit positions, with the rest being zero.
+ */
+#define EXTRACT(regfield, reg) \
+	(((reg) & MASK(regfield)) >> (regfield##_SHIFT))
+
 /*
  * This variant of div_round_up can be used in macro definition but should not
  * be used in C code as the `div` parameter is evaluated twice.
@@ -221,17 +243,4 @@
  */
 #define KHZ_TICKS_PER_SEC U(1000)
 
-/**
- * EXTRACT_FIELD - Extracts a specific bit field from a value.
- *
- * @val:   The input value containing the field.
- * @mask:  A bitmask representing the maximum value of the field
- * @shift: The starting bit position of the field.
- *
- * This macro shifts the input value (@val) to the right by @shift bits,
- * aligning the target field to the least significant bits (LSB).
- * It then applies @mask to extract only the relevant bits.
- */
-#define EXTRACT_FIELD(val, mask, shift)   (((val) >> (shift)) & (mask))
-
 #endif /* UTILS_DEF_H */
diff --git a/include/services/drtm_svc.h b/include/services/drtm_svc.h
index 86110db..56ae129 100644
--- a/include/services/drtm_svc.h
+++ b/include/services/drtm_svc.h
@@ -246,10 +246,10 @@
 #define DRTM_LAUNCH_FEAT_PCR_USAGE_SCHEMA_SHIFT		U(1)
 #define DRTM_LAUNCH_FEAT_HASHING_TYPE_SHIFT		U(0)
 
-#define DRTM_LAUNCH_FEAT_DLME_IMG_AUTH_MASK      	U(0x1)
-#define DRTM_LAUNCH_FEAT_MEM_PROTECTION_TYPE_MASK 	U(0x7)
-#define DRTM_LAUNCH_FEAT_PCR_USAGE_SCHEMA_MASK   	U(0x3)
-#define DRTM_LAUNCH_FEAT_HASHING_TYPE_MASK       	U(0x1)
+#define DRTM_LAUNCH_FEAT_DLME_IMG_AUTH_WIDTH		U(1)
+#define DRTM_LAUNCH_FEAT_MEM_PROTECTION_TYPE_WIDTH	U(3)
+#define DRTM_LAUNCH_FEAT_PCR_USAGE_SCHEMA_WIDTH		U(2)
+#define DRTM_LAUNCH_FEAT_HASHING_TYPE_WIDTH		U(1)
 
 #define DLME_IMG_AUTH					U(0x1)
 #define REG_MEM_PROTECTION_TYPE				U(0x1)