Add support for 64-bit ARM, aarch64, target

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

arch/Kconfig

@@ -5,6 +5,9 @@ choice
 config ARM
 	bool "ARM 32-bit"
 
+config ARM64
+	bool "ARM 64-bit"
+
 config PPC
 	bool "PowerPC 32-bit"
 
@@ -16,9 +19,11 @@ endchoice
 config ARCH
 	string
 	default "arm" if ARM
+	default "arm64" if ARM64
 	default "ppc" if PPC
 	default "x86" if X86
 
 source "arch/arm/Kconfig"
+source "arch/arm64/Kconfig"
 source "arch/ppc/Kconfig"
 source "arch/x86/Kconfig"

arch/arm64/Kconfig

@@ -0,0 +1,14 @@
+choice
+	prompt "Select Target Machine"
+	default GENERIC
+     	depends on ARM64
+
+config GENERIC
+	bool "Generic ARM64 target, with Cortex A57 for qemu"
+
+endchoice
+
+config MACH
+	string
+	default "generic" if GENERIC
+     	depends on ARM64

arch/arm64/config.mk

@@ -0,0 +1,13 @@
+.EXPORT_ALL_VARIABLES:
+
+CROSS_COMPILE := aarch64-unknown-linux-gnu-
+KERNEL_IMG    := Image.gz
+QEMU_ARCH     := aarch64
+# vexpress-a15
+QEMU_MACH     := virt
+# lan9118
+QEMU_NIC      := rtl8139
+QEMU_EXTRA    := -cpu cortex-a57
+# freescale/fsl-ls2080a-simu.dtb # freescale/fsl-ls2080a-rdb.dtb
+#QEMU_DTB      := arm/vexpress-v2f-1xv7-ca53x2.dtb
+

arch/arm64/configs/generic_defconfig

@@ -0,0 +1,69 @@
+#
+# TroglOS Virtual Devboard Default Configuration
+#
+CONFIG_DOT_CONFIG=y
+# CONFIG_ARM is not set
+CONFIG_ARM64=y
+CONFIG_GENERIC=y
+# CONFIG_PPC is not set
+# CONFIG_X86 is not set
+CONFIG_ARCH="arm64"
+CONFIG_MACH="generic"
+
+#
+# Boot Loaders and Firmware
+#
+# CONFIG_RPI_BLOBS is not set
+# CONFIG_UBOOT is not set
+
+#
+# Kernel
+#
+CONFIG_LINUX_VERSION="4.15.4"
+# CONFIG_LINUX_TESTING is not set
+CONFIG_LINUX_CMDLINE="root=/dev/ram mem=256M console=hvc0 console=ttyAMA0,115200"
+
+#
+# Libraries
+#
+CONFIG_CONFUSE=y
+CONFIG_LIBITE=y
+CONFIG_LIBUEV=y
+# CONFIG_LIPIFY is not set
+CONFIG_NCURSES=y
+CONFIG_ZLIB=y
+
+#
+# Networking packages
+#
+CONFIG_DROPBEAR=y
+# CONFIG_INADYN is not set
+# CONFIG_LLDPD is not set
+# CONFIG_MERECAT is not set
+# CONFIG_MINI_SNMPD is not set
+# CONFIG_MROUTED is not set
+# CONFIG_NETCALC is not set
+# CONFIG_NTPCLIENT is not set
+# CONFIG_OMPING is not set
+# CONFIG_MCJOIN is not set
+# CONFIG_PIMD is not set
+# CONFIG_REDIR is not set
+# CONFIG_SMCROUTE is not set
+# CONFIG_UFTPD is not set
+# CONFIG_UREDIR is not set
+
+#
+# System packages
+#
+CONFIG_BUSYBOX=y
+CONFIG_FINIT=y
+# CONFIG_FINIT_BOOT_ANIMATION is not set
+# CONFIG_MG is not set
+# CONFIG_STRACE is not set
+# CONFIG_TETRIS is not set
+CONFIG_WATCHDOGD=y
+
+#
+# User Defined Programs
+#
+# CONFIG_USER_HELLO is not set