cloud-hypervisor: Add the architecture crates

Both crates are based on Firecracker commit 9cdb5b2.
They are ported to the new memory model and tests have been fixed
accordingly.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

arch/src/aarch64/layout.rs

@@ -0,0 +1,7 @@
+// Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+/// Kernel command line start address.
+pub const CMDLINE_START: usize = 0x0;
+/// Kernel command line start address maximum size.
+pub const CMDLINE_MAX_SIZE: usize = 0x0;

arch/src/aarch64/mod.rs

@@ -0,0 +1,26 @@
+// Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+pub mod layout;
+
+use memory_model::{GuestAddress, GuestMemory};
+
+/// Stub function that needs to be implemented when aarch64 functionality is added.
+pub fn arch_memory_regions(size: usize) -> Vec<(GuestAddress, usize)> {
+    vec![(GuestAddress(0), size)]
+}
+
+/// Stub function that needs to be implemented when aarch64 functionality is added.
+pub fn configure_system(
+    _guest_mem: &GuestMemory,
+    _cmdline_addr: GuestAddress,
+    _cmdline_size: usize,
+    _num_cpus: u8,
+) -> super::Result<()> {
+    Ok(())
+}
+
+/// Stub function that needs to be implemented when aarch64 functionality is added.
+pub fn get_reserved_mem_addr() -> usize {
+    0
+}