arch, devices: move serial creation to arch

Split the serial code  into two parts:

- Configuration and setup: arch/src/serial.rs
- Serial device emulation: devices/src/serial.rs

No change in functionality - this is just preparation for generalizing
the command line parsing/setup code so that it can be used with virtio
console devices as well.

BUG=chromium:1059924
TEST=emerge-nami crosvm
TEST=emerge-kevin crosvm

Change-Id: I0aaf9dd6f8096eac4a17077ab5bf569f57d64ff5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2127319
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Daniel Verkamp <dverkamp@chromium.org>

2 files changed, 4 insertions, 6 deletions

diff --git a/aarch64/src/fdt.rs b/aarch64/src/fdt.rs
index 9dcafa5..f50286e 100644
--- a/aarch64/src/fdt.rs
+++ b/aarch64/src/fdt.rs
@@ -10,7 +10,8 @@ use arch::fdt::{
     begin_node, end_node, finish_fdt, generate_prop32, generate_prop64, property, property_cstring,
     property_null, property_string, property_u32, property_u64, start_fdt, Error, Result,
 };
-use devices::{PciInterruptPin, SERIAL_ADDR};
+use arch::SERIAL_ADDR;
+use devices::PciInterruptPin;
 use sys_util::{GuestAddress, GuestMemory};
 
 // This is the start of DRAM in the physical address space.
diff --git a/aarch64/src/lib.rs b/aarch64/src/lib.rs
index f8a36b9..67e37b4 100644
--- a/aarch64/src/lib.rs
+++ b/aarch64/src/lib.rs
@@ -11,11 +11,8 @@ use std::io;
 use std::os::unix::io::FromRawFd;
 use std::sync::Arc;
 
-use arch::{RunnableLinuxVm, VmComponents, VmImage};
-use devices::{
-    get_serial_tty_string, Bus, BusError, PciConfigMmio, PciDevice, PciInterruptPin,
-    SerialParameters,
-};
+use arch::{get_serial_tty_string, RunnableLinuxVm, SerialParameters, VmComponents, VmImage};
+use devices::{Bus, BusError, PciConfigMmio, PciDevice, PciInterruptPin};
 use io_jail::Minijail;
 use remain::sorted;
 use resources::SystemAllocator;