feat(tdx): add UEFI HOB definitions for TDX virtual machines

Signed-off-by: Changyuan Lyu <changyuanl@google.com>

Author: Lencerf

alioth/src/firmware/firmware.rs

@@ -19,6 +19,8 @@ pub mod acpi;
 pub mod dt;
 #[path = "ovmf/ovmf.rs"]
 pub mod ovmf;
+#[path = "uefi/uefi.rs"]
+pub mod uefi;
 
 use snafu::Snafu;
 

alioth/src/firmware/uefi/uefi.rs

@@ -0,0 +1,77 @@
+// Copyright 2026 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use zerocopy::{FromBytes, Immutable, IntoBytes, KnownLayout};
+
+use crate::{bitflags, consts};
+
+consts! {
+    #[derive(Default, KnownLayout, Immutable, FromBytes, IntoBytes)]
+    pub struct HobType(u16) {
+        HANDOFF = 0x0001;
+        RESOURCE_DESCRIPTOR = 0x0003;
+        END_OF_HOB_LIST = 0xffff;
+    }
+}
+
+#[repr(C)]
+#[derive(Debug, Clone, Default, KnownLayout, Immutable, FromBytes, IntoBytes)]
+pub struct HobGenericHeader {
+    pub r#type: HobType,
+    pub length: u16,
+    pub reserved: u32,
+}
+
+pub const HOB_HANDOFF_TABLE_VERSION: u32 = 0x9;
+
+#[repr(C)]
+#[derive(Debug, Clone, Default, KnownLayout, Immutable, FromBytes, IntoBytes)]
+pub struct HobHandoffInfoTable {
+    pub hdr: HobGenericHeader,
+    pub version: u32,
+    pub boot_mode: u32,
+    pub memory_top: u64,
+    pub memory_bottom: u64,
+    pub free_memory_top: u64,
+    pub free_memory_bottom: u64,
+    pub end_of_hob_list: u64,
+}
+
+consts! {
+    #[derive(Default, KnownLayout, Immutable, FromBytes, IntoBytes)]
+    pub struct HobResourceType(u32) {
+        SYSTEM_MEMORY = 0x00000000;
+        MEMORY_UNACCEPTED = 0x00000007;
+    }
+}
+
+bitflags! {
+    #[derive(Default, KnownLayout, Immutable, FromBytes, IntoBytes)]
+    pub struct ResourceAttr(u32) {
+        PRESENT =  1 << 0;
+        INIT =  1 << 1;
+        TESTED = 1 << 2;
+    }
+}
+
+#[repr(C)]
+#[derive(Debug, Clone, Default, KnownLayout, Immutable, FromBytes, IntoBytes)]
+pub struct HobResourceDesc {
+    pub hdr: HobGenericHeader,
+    pub owner: [u8; 16],
+    pub r#type: HobResourceType,
+    pub attr: ResourceAttr,
+    pub address: u64,
+    pub len: u64,
+}