config/arch.aarch64: initial support

config/arch.aarch64

@@ -0,0 +1,43 @@
+# determines TARGET_CPU, if not forced by user
+  if [ -z "$TARGET_CPU" ]; then
+    TARGET_CPU=cortex-a53
+  fi
+
+# TARGET_CPU:
+# arm2 arm250 arm3 arm6 arm60 arm600 arm610 arm620 arm7 arm7m arm7d
+# arm7dm arm7di arm7dmi arm70 arm700 arm700i arm710 arm710c arm7100
+# arm720 arm7500 arm7500fe arm7tdmi arm7tdmi-s arm710t arm720t
+# arm740t strongarm strongarm110 strongarm1100 strongarm1110 arm8
+# arm810 arm9 arm9e arm920 arm920t arm922t arm946e-s arm966e-s
+# arm968e-s arm926ej-s arm940t arm9tdmi arm10tdmi arm1020t
+# arm1026ej-s arm10e arm1020e arm1022e arm1136j-s arm1136jf-s
+# mpcore mpcorenovfp arm1156t2-s arm1156t2f-s arm1176jz-s
+# arm1176jzf-s generic-armv7-a cortex-a5 cortex-a7 cortex-a8
+# cortex-a9 cortex-a12 cortex-a15 cortex-a17 cortex-a53
+# cortex-a57 cortex-a72 cortex-r4 cortex-r4f cortex-r5 cortex-r7
+# cortex-m7 cortex-m4 cortex-m3 cortex-m1 cortex-m0 cortex-m0plus
+# cortex-m1.small-multiply cortex-m0.small-multiply
+# cortex-m0plus.small-multiply exynos-m1 qdf24xx marvell-pj4
+# xscale iwmmxt iwmmxt2 ep9312 fa526 fa626 fa606te fa626te fmp626
+# fa726te xgene1 cortex-a15.cortex-a7 cortex-a17.cortex-a7
+# cortex-a57.cortex-a53 cortex-a72.cortex-a53
+
+# determine architecture's family
+  case $TARGET_CPU in
+    cortex-a53)
+      TARGET_SUBARCH=aarch64
+      TARGET_VARIANT=armv8-a
+      TARGET_ABI=eabi
+      TARGET_CPU_FLAGS="+crc+crypto"
+      TARGET_EXTRA_FLAGS="-mcpu=${TARGET_CPU}${TARGET_CPU_FLAGS}"
+      SIMD_SUPPORT="yes"
+      ;;
+  esac
+
+  TARGET_GCC_ARCH=$(echo $TARGET_SUBARCH | sed -e "s,-,,")
+  TARGET_KERNEL_ARCH=arm64
+
+# setup ARCH specific *FLAGS
+  TARGET_CFLAGS="-march=${TARGET_VARIANT}${TARGET_CPU_FLAGS} -mabi=lp64 -Wno-psabi $TARGET_EXTRA_FLAGS"
+  TARGET_LDFLAGS="-march=${TARGET_VARIANT}${TARGET_CPU_FLAGS} -mtune=$TARGET_CPU"
+  GCC_OPTS="--with-abi=lp64 --with-arch=$TARGET_VARIANT"