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Index: head/sys/cddl/compat/opensolaris/sys/atomic.h
===================================================================
--- head/sys/cddl/compat/opensolaris/sys/atomic.h
+++ head/sys/cddl/compat/opensolaris/sys/atomic.h
@@ -51,7 +51,7 @@
extern void membar_producer(void);
#if defined(__sparc64__) || defined(__powerpc__) || defined(__arm__) || \
- defined(__mips__)
+ defined(__mips__) || defined(__aarch64__)
extern void atomic_or_8(volatile uint8_t *target, uint8_t value);
#else
static __inline void
Index: head/sys/cddl/contrib/opensolaris/uts/common/sys/isa_defs.h
===================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/sys/isa_defs.h
+++ head/sys/cddl/contrib/opensolaris/uts/common/sys/isa_defs.h
@@ -346,6 +346,48 @@
#define _DONT_USE_1275_GENERIC_NAMES
#define _HAVE_CPUID_INSN
+#elif defined(__aarch64__)
+
+/*
+ * Define the appropriate "processor characteristics"
+ */
+#define _STACK_GROWS_DOWNWARD
+#define _LONG_LONG_LTOH
+#define _BIT_FIELDS_LTOH
+#define _IEEE_754
+#define _CHAR_IS_UNSIGNED
+#define _BOOL_ALIGNMENT 1
+#define _CHAR_ALIGNMENT 1
+#define _SHORT_ALIGNMENT 2
+#define _INT_ALIGNMENT 4
+#define _FLOAT_ALIGNMENT 4
+#define _FLOAT_COMPLEX_ALIGNMENT 4
+#define _LONG_ALIGNMENT 8
+#define _LONG_LONG_ALIGNMENT 8
+#define _DOUBLE_ALIGNMENT 8
+#define _DOUBLE_COMPLEX_ALIGNMENT 8
+#define _LONG_DOUBLE_ALIGNMENT 16
+#define _LONG_DOUBLE_COMPLEX_ALIGNMENT 16
+#define _POINTER_ALIGNMENT 8
+#define _MAX_ALIGNMENT 16
+#define _ALIGNMENT_REQUIRED 1
+
+#define _LONG_LONG_ALIGNMENT_32 _LONG_LONG_ALIGNMENT
+
+/*
+ * Define the appropriate "implementation choices"
+ */
+#if !defined(_LP64)
+#define _LP64
+#endif
+#define _SUNOS_VTOC_16
+#define _DMA_USES_PHYSADDR
+#define _FIRMWARE_NEEDS_FDISK
+#define _PSM_MODULES
+#define _RTC_CONFIG
+#define _DONT_USE_1275_GENERIC_NAMES
+#define _HAVE_CPUID_INSN
+
#elif defined(__arm__)
/*

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