--- zzzz-none-000/linux-5.4.213/arch/arm64/include/asm/assembler.h	2022-09-15 10:04:56.000000000 +0000
+++ alder-5690pro-762/linux-5.4.213/arch/arm64/include/asm/assembler.h	2024-08-14 09:01:29.000000000 +0000
@@ -418,6 +418,45 @@
 	.endm
 
 /*
+ * Macro to perform a data cache maintenance for the interval
+ * [kaddr, kaddr + size)
+ * This macro does not do "data synchronization barrier". Caller should
+ * do "dsb" after transaction.
+ *
+ * 	op:		operation passed to dc instruction
+ * 	kaddr:		starting virtual address of the region
+ * 	size:		size of the region
+ * 	Corrupts:	kaddr, size, tmp1, tmp2
+ */
+	.macro dcache_by_line_op_no_dsb op, kaddr, size, tmp1, tmp2
+	dcache_line_size \tmp1, \tmp2
+	add	\size, \kaddr, \size
+	sub	\tmp2, \tmp1, #1
+	bic	\kaddr, \kaddr, \tmp2
+9998:
+	.ifc	\op, cvau
+	__dcache_op_workaround_clean_cache \op, \kaddr
+	.else
+	.ifc	\op, cvac
+	__dcache_op_workaround_clean_cache \op, \kaddr
+	.else
+	.ifc	\op, cvap
+	sys	3, c7, c12, 1, \kaddr	// dc cvap
+	.else
+	.ifc	\op, cvadp
+	sys	3, c7, c13, 1, \kaddr	// dc cvadp
+	.else
+	dc	\op, \kaddr
+	.endif
+	.endif
+	.endif
+	.endif
+	add	\kaddr, \kaddr, \tmp1
+	cmp	\kaddr, \size
+	b.lo	9998b
+	.endm
+
+/*
  * Macro to perform an instruction cache maintenance for the interval
  * [start, end)
  *