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-rw-r--r--arch/arm/cpu/armv7/Makefile4
-rw-r--r--arch/arm/cpu/armv7/sctlr.S22
2 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/Makefile b/arch/arm/cpu/armv7/Makefile
index 26056647df0..4f4647c90ac 100644
--- a/arch/arm/cpu/armv7/Makefile
+++ b/arch/arm/cpu/armv7/Makefile
@@ -12,6 +12,10 @@ obj-y += syslib.o
obj-$(CONFIG_SYS_ARM_MPU) += mpu_v7r.o
+ifneq ($(CONFIG_SPL_BUILD),y)
+obj-$(CONFIG_EFI_LOADER) += sctlr.o
+endif
+
ifneq ($(CONFIG_SKIP_LOWLEVEL_INIT),y)
obj-y += lowlevel_init.o
endif
diff --git a/arch/arm/cpu/armv7/sctlr.S b/arch/arm/cpu/armv7/sctlr.S
new file mode 100644
index 00000000000..bd56e41afe1
--- /dev/null
+++ b/arch/arm/cpu/armv7/sctlr.S
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Routines to access the system control register
+ *
+ * Copyright (c) 2018 Heinrich Schuchardt
+ */
+
+#include <linux/linkage.h>
+
+/*
+ * void allow_unaligned(void) - allow unaligned access
+ *
+ * This routine clears the aligned flag in the system control register.
+ * After calling this routine unaligned access does no longer lead to a
+ * data abort but is handled by the CPU.
+ */
+ENTRY(allow_unaligned)
+ mrc p15, 0, r0, c1, c0, 0 @ load system control register
+ bic r0, r0, #2 @ clear aligned flag
+ mcr p15, 0, r0, c1, c0, 0 @ write system control register
+ bx lr @ return
+ENDPROC(allow_unaligned)