From c76fd6df21c3ca6a0740ba55b0901ce8bc8c567d Mon Sep 17 00:00:00 2001
From: Rob Bradford <robert.bradford@intel.com>
Date: Tue, 22 Oct 2019 18:47:58 +0100
Subject: [PATCH] acpi_tables: aml: Implement AML Zero, One, Ones

These are special encodings for representing zero, one or all ones in a
single byte.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
---
 acpi_tables/src/aml.rs | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/acpi_tables/src/aml.rs b/acpi_tables/src/aml.rs
index 86710d065..e44c02cfc 100644
--- a/acpi_tables/src/aml.rs
+++ b/acpi_tables/src/aml.rs
@@ -7,6 +7,33 @@ pub trait Aml {
     fn to_bytes(&self) -> Vec<u8>;
 }
 
+pub const ZERO: Zero = Zero {};
+pub struct Zero {}
+
+impl Aml for Zero {
+    fn to_bytes(&self) -> Vec<u8> {
+        vec![0u8]
+    }
+}
+
+pub const ONE: One = One {};
+pub struct One {}
+
+impl Aml for One {
+    fn to_bytes(&self) -> Vec<u8> {
+        vec![1u8]
+    }
+}
+
+pub const ONES: Ones = Ones {};
+pub struct Ones {}
+
+impl Aml for Ones {
+    fn to_bytes(&self) -> Vec<u8> {
+        vec![0xffu8]
+    }
+}
+
 pub struct Path {
     root: bool,
     name_parts: Vec<[u8; 4]>,