Move split_irqchip_common to devices/.

Previously, code in devices/ couldn't use split_irqchip_common, since
x86_64/ already has a dependency on devices/.

TEST=Built.
BUG=chromium:908689

Change-Id: I481514ae6bbd68e47feecc6f364ca8f4fd798e67
Reviewed-on: https://chromium-review.googlesource.com/1526762
Commit-Ready: Miriam Zimmerman <mutexlox@chromium.org>
Tested-by: Miriam Zimmerman <mutexlox@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: David Tolnay <dtolnay@chromium.org>

1 files changed, 76 insertions, 0 deletions

diff --git a/devices/src/split_irqchip_common.rs b/devices/src/split_irqchip_common.rs
new file mode 100644
index 0000000..6a722e2
--- /dev/null
+++ b/devices/src/split_irqchip_common.rs
@@ -0,0 +1,76 @@
+// Copyright 2019 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Common constants and types used for Split IRQ chip devices (e.g. PIC, PIT, IOAPIC).
+
+use bit_field::*;
+
+#[bitfield]
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum DestinationMode {
+    Physical = 0,
+    Logical = 1,
+}
+
+#[bitfield]
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum TriggerMode {
+    Edge = 0,
+    Level = 1,
+}
+
+#[derive(Clone, Copy, PartialEq)]
+pub enum DeliveryMode {
+    DeliveryModeFixed = 0b000,
+    DeliveryModeLowest = 0b001,
+    DeliveryModeSMI = 0b010,        // System management interrupt
+    DeliveryModeRemoteRead = 0b011, // This is no longer supported by intel.
+    DeliveryModeNMI = 0b100,        // Non maskable interrupt
+    DeliveryModeInit = 0b101,
+    DeliveryModeStartup = 0b110,
+    DeliveryModeExternal = 0b111,
+}
+
+#[bitfield]
+#[derive(Clone, Copy, PartialEq)]
+pub struct MsiAddressMessageNonRemappable {
+    reserved: BitField2,
+    #[bits = 1]
+    destination_mode: DestinationMode,
+    redirection_hint: BitField1,
+    reserved_2: BitField8,
+    destination_id: BitField8,
+    // According to Intel's implementation of MSI, these bits must always be 0xfee.
+    always_0xfee: BitField12,
+}
+
+#[bitfield]
+#[derive(Clone, Copy, PartialEq)]
+pub struct MsiAddressMessageRemappable {
+    reserved: BitField2,
+    handle_hi: BitField1, // Bit 15 of handle
+    shv: BitField1,
+    interrupt_format: BitField1,
+    handle_low: BitField15, // Bits 0-14 of handle.
+    // According to Intel's implementation of MSI, these bits must always be 0xfee.
+    always_0xfee: BitField12,
+}
+
+#[derive(Clone, Copy, PartialEq)]
+pub enum MsiAddressMessage {
+    NonRemappable(MsiAddressMessageNonRemappable),
+    Remappable(MsiAddressMessageRemappable),
+}
+
+#[bitfield]
+#[derive(Clone, Copy, PartialEq)]
+struct MsiDataMessage {
+    vector: BitField8,
+    delivery_mode: BitField3,
+    reserved: BitField3,
+    level: BitField1,
+    #[bits = 1]
+    trigger: TriggerMode,
+    reserved2: BitField16,
+}