add experimental aarch64 support

Ported over from GNU C Library and runtime tested in Qemu.

3 files changed, 43 insertions, 2 deletions

diff --git a/extra/Configs/Config.aarch64 b/extra/Configs/Config.aarch64
new file mode 100644
index 000000000..cf1ce3b79
--- /dev/null
+++ b/extra/Configs/Config.aarch64
@@ -0,0 +1,32 @@
+#
+# For a description of the syntax of this configuration file,
+# see extra/config/Kconfig-language.txt
+#
+
+config TARGET_ARCH
+	string
+	default "aarch64"
+
+config FORCE_OPTIONS_FOR_ARCH
+	bool
+	default y
+	select ARCH_ANY_ENDIAN
+	select ARCH_HAS_MMU
+	select UCLIBC_HAS_FPU
+
+choice
+	prompt "MMU Page Size"
+	default CONFIG_AARCH64_PAGE_SIZE_4K
+
+config CONFIG_AARCH64_PAGE_SIZE_4K
+	bool "4KB"
+	help
+	  Choose between 4k(default), 16k or 64k
+
+config CONFIG_AARCH64_PAGE_SIZE_16K
+	bool "16KB"
+
+config CONFIG_AARCH64_PAGE_SIZE_64K
+	bool "64KB"
+
+endchoice
diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in
index b2cf977b7..850bd7d13 100644
--- a/extra/Configs/Config.in
+++ b/extra/Configs/Config.in
@@ -15,6 +15,7 @@ config VERSION
 
 choice
 	prompt "Target Architecture"
+	default TARGET_aarch64 if DESIRED_TARGET_ARCH = "aarch64"
 	default TARGET_alpha if DESIRED_TARGET_ARCH = "alpha"
 	default TARGET_arc if DESIRED_TARGET_ARCH = "arc"
 	default TARGET_arm if DESIRED_TARGET_ARCH = "arm"
@@ -42,6 +43,9 @@ choice
 	help
 	  The architecture of your target.
 
+config TARGET_aarch64
+	bool "aarch64"
+
 config TARGET_alpha
 	bool "alpha"
 
@@ -124,6 +128,10 @@ endchoice
 
 menu "Target Architecture Features and Options"
 
+if TARGET_aarch64
+source "extra/Configs/Config.aarch64"
+endif
+
 if TARGET_alpha
 source "extra/Configs/Config.alpha"
 endif
@@ -500,7 +508,8 @@ config UCLIBC_HAS_LINUXTHREADS
 	bool "Linuxthreads"
 	# linuxthreads need nanosleep()
 	select UCLIBC_HAS_REALTIME
-	depends on !TARGET_metag
+	depends on !TARGET_aarch64 && \
+		   !TARGET_metag
 	help
 	  If you want to compile uClibc with Linuxthreads support, then answer Y.
 
diff --git a/extra/Configs/Config.in.arch b/extra/Configs/Config.in.arch
index 37dd8bd74..a1a2a5f99 100644
--- a/extra/Configs/Config.in.arch
+++ b/extra/Configs/Config.in.arch
@@ -191,7 +191,7 @@ config UCLIBC_HAS_FENV
 config UCLIBC_HAS_LONG_DOUBLE_MATH
 	bool "Enable long double support"
 	depends on DO_C99_MATH
-	depends on TARGET_aarch64 || TARGET_alpha || TARGET_i386 || TARGET_ia64 || TARGET_m68k || TARGET_powerpc || TARGET_s390 || TARGET_sparc || TARGET_tile || TARGET_x86_64
+	depends on TARGET_alpha || TARGET_i386 || TARGET_ia64 || TARGET_m68k || TARGET_powerpc || TARGET_s390 || TARGET_sparc || TARGET_tile || TARGET_x86_64
 	default y
 	help
 	  If you want the uClibc math library to contain the full set of C99