--- zzzz-none-000/linux-4.4.271/arch/arm/include/asm/proc-fns.h	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/arch/arm/include/asm/proc-fns.h	2023-04-19 10:22:27.000000000 +0000
@@ -172,7 +172,29 @@
 		pg &= ~(PTRS_PER_PGD*sizeof(pgd_t)-1);	\
 		(pgd_t *)phys_to_virt(pg);		\
 	})
+#define cpu_set_ttbr0(val)					\
+	do {							\
+		u64 ttbr = val;					\
+		__asm__("mcrr	p15, 0, %0, %1, c2"		\
+			: : "r" (ttbr), "r" (ttbr >> 32));	\
+	} while (0)
+
 #else
+#define cpu_get_ttbr(nr)					\
+	({							\
+		unsigned long ttbr;				\
+		__asm__("mrc	p15, 0, %0, c2, c0, 0"		\
+			: "=r" (ttbr));				\
+		ttbr;						\
+	})
+
+#define cpu_set_ttbr0(val)					\
+	do {							\
+		u64 ttbr = val;					\
+		__asm__("mcr	p15, 0, %0, c2, c0, 0"		\
+			: : "r" (ttbr));			\
+	} while (0)
+
 #define cpu_get_pgd()	\
 	({						\
 		unsigned long pg;			\