diff --git a/arch/arm64/tools/gen-sysreg.awk b/arch/arm64/tools/gen-sysreg.awk
index 172d04bb6cc3..5ca81eaac2cb 100755
--- a/arch/arm64/tools/gen-sysreg.awk
+++ b/arch/arm64/tools/gen-sysreg.awk
@@ -44,21 +44,26 @@ function expect_fields(nf) {
 
 # Print a CPP macro definition, padded with spaces so that the macro bodies
 # line up in a column
-function define(name, val) {
-	printf "%-56s%s\n", "#define " name, val
+function define(prefix, name, val) {
+	printf "%-56s%s\n", "#define " prefix name, val
+}
+
+# Same as above, but without a prefix
+function define_reg(name, val) {
+	define(null, name, val)
 }
 
 # Print standard BITMASK/SHIFT/WIDTH CPP definitions for a field
-function define_field(reg, field, msb, lsb) {
-	define(reg "_" field, "GENMASK(" msb ", " lsb ")")
-	define(reg "_" field "_MASK", "GENMASK(" msb ", " lsb ")")
-	define(reg "_" field "_SHIFT", lsb)
-	define(reg "_" field "_WIDTH", msb - lsb + 1)
+function define_field(prefix, reg, field, msb, lsb) {
+	define(prefix, reg "_" field, "GENMASK(" msb ", " lsb ")")
+	define(prefix, reg "_" field "_MASK", "GENMASK(" msb ", " lsb ")")
+	define(prefix, reg "_" field "_SHIFT", lsb)
+	define(prefix, reg "_" field "_WIDTH", msb - lsb + 1)
 }
 
 # Print a field _SIGNED definition for a field
-function define_field_sign(reg, field, sign) {
-	define(reg "_" field "_SIGNED", sign)
+function define_field_sign(prefix, reg, field, sign) {
+	define(prefix, reg "_" field "_SIGNED", sign)
 }
 
 # Parse a "<msb>[:<lsb>]" string into the global variables @msb and @lsb
@@ -128,6 +133,8 @@ $1 == "SysregFields" && block_current() == "Root" {
 
 	next_bit = 63
 
+	delete seen_prefixes
+
 	next
 }
 
@@ -136,9 +143,9 @@ $1 == "EndSysregFields" && block_current() == "SysregFields" {
 	if (next_bit >= 0)
 		fatal("Unspecified bits in " reg)
 
-	define(reg "_RES0", "(" res0 ")")
-	define(reg "_RES1", "(" res1 ")")
-	define(reg "_UNKN", "(" unkn ")")
+	define(prefix, reg "_RES0", "(" res0 ")")
+	define(prefix, reg "_RES1", "(" res1 ")")
+	define(prefix, reg "_UNKN", "(" unkn ")")
 	print ""
 
 	reg = null
@@ -170,19 +177,22 @@ $1 == "Sysreg" && block_current() == "Root" {
 		fatal("Duplicate Sysreg definition for " reg)
 	defined_regs[reg] = 1
 
-	define("REG_" reg, "S" op0 "_" op1 "_C" crn "_C" crm "_" op2)
-	define("SYS_" reg, "sys_reg(" op0 ", " op1 ", " crn ", " crm ", " op2 ")")
+	define_reg("REG_" reg, "S" op0 "_" op1 "_C" crn "_C" crm "_" op2)
+	define_reg("SYS_" reg, "sys_reg(" op0 ", " op1 ", " crn ", " crm ", " op2 ")")
 
-	define("SYS_" reg "_Op0", op0)
-	define("SYS_" reg "_Op1", op1)
-	define("SYS_" reg "_CRn", crn)
-	define("SYS_" reg "_CRm", crm)
-	define("SYS_" reg "_Op2", op2)
+	define_reg("SYS_" reg "_Op0", op0)
+	define_reg("SYS_" reg "_Op1", op1)
+	define_reg("SYS_" reg "_CRn", crn)
+	define_reg("SYS_" reg "_CRm", crm)
+	define_reg("SYS_" reg "_Op2", op2)
 
 	print ""
 
+	prefix = null
 	next_bit = 63
 
+	delete seen_prefixes
+
 	next
 }
 
@@ -192,11 +202,11 @@ $1 == "EndSysreg" && block_current() == "Sysreg" {
 		fatal("Unspecified bits in " reg)
 
 	if (res0 != null)
-		define(reg "_RES0", "(" res0 ")")
+		define(prefix, reg "_RES0", "(" res0 ")")
 	if (res1 != null)
-		define(reg "_RES1", "(" res1 ")")
+		define(prefix, reg "_RES1", "(" res1 ")")
 	if (unkn != null)
-		define(reg "_UNKN", "(" unkn ")")
+		define(prefix, reg "_UNKN", "(" unkn ")")
 	if (res0 != null || res1 != null || unkn != null)
 		print ""
 
@@ -209,6 +219,7 @@ $1 == "EndSysreg" && block_current() == "Sysreg" {
 	res0 = null
 	res1 = null
 	unkn = null
+	prefix = null
 
 	block_pop()
 	next
@@ -233,8 +244,7 @@ $1 == "EndSysreg" && block_current() == "Sysreg" {
 	next
 }
 
-
-$1 == "Res0" && (block_current() == "Sysreg" || block_current() == "SysregFields") {
+$1 == "Res0" && (block_current() == "Sysreg" || block_current() == "SysregFields" || block_current() == "Prefix") {
 	expect_fields(2)
 	parse_bitdef(reg, "RES0", $2)
 	field = "RES0_" msb "_" lsb
@@ -244,7 +254,7 @@ $1 == "Res0" && (block_current() == "Sysreg" || block_current() == "SysregFields
 	next
 }
 
-$1 == "Res1" && (block_current() == "Sysreg" || block_current() == "SysregFields") {
+$1 == "Res1" && (block_current() == "Sysreg" || block_current() == "SysregFields" || block_current() == "Prefix") {
 	expect_fields(2)
 	parse_bitdef(reg, "RES1", $2)
 	field = "RES1_" msb "_" lsb
@@ -254,7 +264,7 @@ $1 == "Res1" && (block_current() == "Sysreg" || block_current() == "SysregFields
 	next
 }
 
-$1 == "Unkn" && (block_current() == "Sysreg" || block_current() == "SysregFields") {
+$1 == "Unkn" && (block_current() == "Sysreg" || block_current() == "SysregFields" || block_current() == "Prefix") {
 	expect_fields(2)
 	parse_bitdef(reg, "UNKN", $2)
 	field = "UNKN_" msb "_" lsb
@@ -264,62 +274,62 @@ $1 == "Unkn" && (block_current() == "Sysreg" || block_current() == "SysregFields
 	next
 }
 
-$1 == "Field" && (block_current() == "Sysreg" || block_current() == "SysregFields") {
+$1 == "Field" && (block_current() == "Sysreg" || block_current() == "SysregFields" || block_current() == "Prefix") {
 	expect_fields(3)
 	field = $3
 	parse_bitdef(reg, field, $2)
 
-	define_field(reg, field, msb, lsb)
+	define_field(prefix, reg, field, msb, lsb)
 	print ""
 
 	next
 }
 
-$1 == "Raz" && (block_current() == "Sysreg" || block_current() == "SysregFields") {
+$1 == "Raz" && (block_current() == "Sysreg" || block_current() == "SysregFields" || block_current() == "Prefix") {
 	expect_fields(2)
 	parse_bitdef(reg, field, $2)
 
 	next
 }
 
-$1 == "SignedEnum" && (block_current() == "Sysreg" || block_current() == "SysregFields") {
+$1 == "SignedEnum" && (block_current() == "Sysreg" || block_current() == "SysregFields" || block_current() == "Prefix") {
 	block_push("Enum")
 
 	expect_fields(3)
 	field = $3
 	parse_bitdef(reg, field, $2)
 
-	define_field(reg, field, msb, lsb)
-	define_field_sign(reg, field, "true")
+	define_field(prefix, reg, field, msb, lsb)
+	define_field_sign(prefix, reg, field, "true")
 
 	delete seen_enum_vals
 
 	next
 }
 
-$1 == "UnsignedEnum" && (block_current() == "Sysreg" || block_current() == "SysregFields") {
+$1 == "UnsignedEnum" && (block_current() == "Sysreg" || block_current() == "SysregFields" || block_current() == "Prefix") {
 	block_push("Enum")
 
 	expect_fields(3)
 	field = $3
 	parse_bitdef(reg, field, $2)
 
-	define_field(reg, field, msb, lsb)
-	define_field_sign(reg, field, "false")
+	define_field(prefix, reg, field, msb, lsb)
+	define_field_sign(prefix, reg, field, "false")
 
 	delete seen_enum_vals
 
 	next
 }
 
-$1 == "Enum" && (block_current() == "Sysreg" || block_current() == "SysregFields") {
+$1 == "Enum" && (block_current() == "Sysreg" || block_current() == "SysregFields" || block_current() == "Prefix") {
 	block_push("Enum")
 
 	expect_fields(3)
 	field = $3
 	parse_bitdef(reg, field, $2)
 
-	define_field(reg, field, msb, lsb)
+	define_field(prefix, reg, field, msb, lsb)
 
 	delete seen_enum_vals
 
@@ -349,7 +359,47 @@ $1 == "EndEnum" && block_current() == "Enum" {
 		fatal("Duplicate Enum value " val " for " name)
 	seen_enum_vals[val] = 1
 
-	define(reg "_" field "_" name, "UL(" val ")")
+	define(prefix, reg "_" field "_" name, "UL(" val ")")
+	next
+}
+
+$1 == "Prefix" && (block_current() == "Sysreg" || block_current() == "SysregFields") {
+	block_push("Prefix")
+
+	expect_fields(2)
+
+	if (next_bit < 63)
+		fatal("Prefixed fields must precede non-prefixed fields (" reg ")")
+
+	prefix = $2 "_"
+
+	if (prefix in seen_prefixes)
+		fatal("Duplicate prefix " prefix " for " reg)
+	seen_prefixes[prefix] = 1
+
+	res0 = "UL(0)"
+	res1 = "UL(0)"
+	unkn = "UL(0)"
+	next_bit = 63
+
+	next
+}
+
+$1 == "EndPrefix" && block_current() == "Prefix" {
+	expect_fields(1)
+	if (next_bit >= 0)
+		fatal("Unspecified bits in prefix " prefix " for " reg)
+
+	define_resx_unkn(prefix, reg, res0, res1, unkn)
+
+	prefix = null
+	res0 = "UL(0)"
+	res1 = "UL(0)"
+	unkn = "UL(0)"
+	next_bit = 63
+
+	block_pop()
+
 	next
 }