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XTF on arm

Hello guys,

During the last Xen community call I was talking about my work to port XTF to 
arm(more specifically arm64).
There was quite a bigh interest in this topic hence I created a pull request 
for Andrew's XTF on github with the first patch series.
It consists of several patches creating a base for further implementations.

Support for arm64 allows to run a hello-world test(tests/example) with 2 
-64le: arm64, little endian, no MMU
-mmu64le: arm64, little endian, MMU
Support for arm32 allows to run only a startup code.

This series was tested using qemu-system-aarch64 and FVP_Base_RevC-2xAEMvA with 
XTF running
as dom0 or domU.

Please review, test, comment and feel free to ask questions(please do that on 

Pull request:

How to download pull request from github:

Instructions on how to prepare base setup for testing XTF on arm64 using QEMU:

1. Build XTF:
make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- CONFIG_LOAD_ADDRESS=0x80000000
-this will result in 2 binaries inside tests/example:
->test-arm-64le-example - no MMU(uses 0x80000000 as a start address)
->test-arm-mmu64le-example - with MMU

2. Build Xen for arm64
-select early printk for PL011, 0x9000000, 115200

3. Generate device tree:
qemu-system-aarch64 -machine virt,gic_version=3 -machine virtualization=true 
-cpu cortex-a57 -machine type=virt -m 4096 -smp 4 -display none -machine 

4. Add chosen node:
chosen {
xen,xen-bootargs = "noreboot dom0_mem=1024M console=dtuart dtuart=serial0 
bootscrub=0 iommu=no";

modules {
#size-cells = <0x1>;
#address-cells = <0x1>;

module@0 {
reg = <0x47000000 0x1000000>;
compatible = "xen,linux-zimage", "multiboot,module";


5. Build u-boot for qemu arm64

6. Run Xen on QEMU with XTF as dom0:
    -machine virt,gic_version=3
    -machine virtualization=true
    -cpu cortex-a57
    -machine type=virt -m 4096 -smp 4
    -bios <u_boot_binary>
    -device loader,file=<xen_binary>,force-raw=on,addr=0x49000000
    -device loader,file=test-arm-mmu64le-example,addr=0x47000000
    -device loader,file=virt-gicv3.dtb,addr=0x44000000
    -nographic -no-reboot
    -mon qemu-monitor,mode=readline




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