diff --git a/Cargo.lock b/Cargo.lock
index 11b6e4e4cfe..dd57b61716e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3170,6 +3170,9 @@ dependencies = [
  "oak_sev_snp_attestation_report",
  "oak_stage0_dice",
  "p256",
+ "prost",
+ "prost-build",
+ "prost-types",
  "rand_core",
  "sev_serial",
  "sha2",
diff --git a/stage0/Cargo.toml b/stage0/Cargo.toml
index ab4a1950916..b9484e3f6f1 100644
--- a/stage0/Cargo.toml
+++ b/stage0/Cargo.toml
@@ -5,6 +5,9 @@ authors = ["Andri Saar <andrisaar@google.com>"]
 edition = "2021"
 license = "Apache-2.0"
 
+[build-dependencies]
+prost-build = { version = "*" }
+
 [dependencies]
 bitflags = "*"
 coset = { version = "*", default-features = false }
@@ -23,6 +26,8 @@ p256 = { version = "*", default-features = false, features = ["ecdsa"] }
 rand_core = { version = "*", default-features = false, features = [
   "getrandom",
 ] }
+prost = {version = "*", default-features = false, features = ["prost-derive"]}
+prost-types = {version = "*", default-features = false}
 sev_serial = { path = "../sev_serial" }
 sha2 = { version = "*", default-features = false, features = ["force-soft"] }
 spinning_top = "*"
diff --git a/stage0/build.rs b/stage0/build.rs
new file mode 100644
index 00000000000..4b28760cc21
--- /dev/null
+++ b/stage0/build.rs
@@ -0,0 +1,8 @@
+extern crate prost_build;
+
+fn main() {
+    let mut config = prost_build::Config::new();
+    config.btree_map(&["."]);
+    prost_build::compile_protos(&["src/eventlog.proto"],
+                                &["src/"]).unwrap();
+}
\ No newline at end of file
diff --git a/stage0/src/eventlog.proto b/stage0/src/eventlog.proto
new file mode 100644
index 00000000000..0d21d04cc88
--- /dev/null
+++ b/stage0/src/eventlog.proto
@@ -0,0 +1,39 @@
+syntax = "proto2";
+
+package eventlog;
+
+import "google/protobuf/any.proto";
+
+// All the related measurements for Stage 0.
+message Stage0Measurements {
+  // Kernel setup data digest.
+  optional bytes setup_data_digest = 1;
+  // Kernel digest.
+  optional bytes kernel_measurement = 2;
+  // Initial RAM disk digest.
+  optional bytes ram_disk_digest = 3;
+  // E820 table digest
+  optional bytes memory_map_digest = 4;
+  // ACPI table generation digest
+  optional bytes acpi_digest = 5;
+  // Kernel Command line.
+  optional string kernel_cmdline = 6;
+}
+
+// Represents an event intended for inclusion in attestation.
+// For example, in an attested measured boot, each event is a reference to the
+// code identity of the boot layer being launched next.
+// An Event message must have a canonical serialization and contain what's
+// necessary for an attestation verifier to verify the Event against a Reference
+// Value.
+message Event {
+  // Represents what is contains in the event. For example, the tag for
+  // TaskConfig for the Layer 2 is "layer2".
+  optional string tag = 1;
+  optional google.protobuf.Any event = 2;
+}
+
+// A sequence of Events intended for inclusion in attestation evidence.
+message EventLog {
+  repeated Event events = 1;
+}
diff --git a/stage0/src/lib.rs b/stage0/src/lib.rs
index 01b4a3da56b..b1b20bc0ad2 100644
--- a/stage0/src/lib.rs
+++ b/stage0/src/lib.rs
@@ -21,7 +21,7 @@
 
 extern crate alloc;
 
-use alloc::{boxed::Box, format};
+use alloc::{boxed::Box, format, string::String};
 use core::{arch::asm, ffi::c_void, mem::MaybeUninit, panic::PanicInfo};
 
 use linked_list_allocator::LockedHeap;
@@ -29,6 +29,8 @@ use oak_core::sync::OnceCell;
 use oak_dice::evidence::{TeePlatform, DICE_DATA_CMDLINE_PARAM};
 use oak_linux_boot_params::{BootE820Entry, E820EntryType};
 use oak_sev_guest::{io::PortFactoryWrapper, msr::SevStatus};
+use prost::{Message, Name};
+use prost_types::Any;
 use sha2::{Digest, Sha256};
 use x86_64::{
     instructions::{hlt, interrupts::int3},
@@ -61,6 +63,10 @@ mod sev;
 mod smp;
 mod zero_page;
 
+pub mod eventlog {
+    include!(concat!(env!("OUT_DIR"), "/eventlog.rs"));
+}
+
 type Measurement = [u8; 32];
 
 // Reserve 128K for boot data structures that will outlive Stage 0.
@@ -339,6 +345,7 @@ pub fn rust64_start(encrypted: u64) -> ! {
         ),
         &crate::BOOT_ALLOC,
     ));
+
     // Reserve the memory containing the DICE data.
     zero_page.insert_e820_entry(BootE820Entry::new(
         dice_data.as_bytes().as_ptr() as usize,
@@ -346,6 +353,26 @@ pub fn rust64_start(encrypted: u64) -> ! {
         E820EntryType::RESERVED,
     ));
 
+    // Generate Stage0 Event Log data.
+    let mut stage0event = eventlog::Stage0Measurements::default();
+    stage0event.kernel_measurement = Some(kernel_info.measurement.as_bytes().to_vec());
+    stage0event.acpi_digest = Some(acpi_sha2_256_digest.as_bytes().to_vec());
+    stage0event.memory_map_digest = Some(memory_map_sha2_256_digest.as_bytes().to_vec());
+    stage0event.ram_disk_digest = Some(ram_disk_sha2_256_digest.as_bytes().to_vec());
+    stage0event.setup_data_digest = Some(setup_data_sha2_256_digest.as_bytes().to_vec());
+    stage0event.kernel_cmdline = Some(cmdline.clone());
+    let event_log = Box::leak(Box::new_in(
+        generate_event_log(stage0event),
+        &crate::BOOT_ALLOC,
+    ));
+    log::info!("event tag = {:?}", event_log);
+    // Reserve memory containing Eventlog Data.
+    zero_page.insert_e820_entry(BootE820Entry::new(
+        event_log.encode_to_vec().as_bytes().as_ptr() as usize,
+        event_log.encode_to_vec().as_bytes().len(),
+        E820EntryType::RESERVED,
+    ));
+
     // Append the DICE data address to the kernel command-line.
     let extra = format!("--{DICE_DATA_CMDLINE_PARAM}={dice_data:p}");
     let cmdline = if kernel_info.kernel_type == KernelType::Elf {
@@ -414,3 +441,33 @@ fn io_port_factory() -> PortFactoryWrapper {
         PortFactoryWrapper::new_raw()
     }
 }
+
+const PACKAGE: &str = "google.protobuf";
+
+/// Compute the type URL for the given `google.protobuf` type, using
+/// `type.googleapis.com` as the authority for the URL.
+fn type_url_for<T: Name>() -> String {
+    format!("type.googleapis.com/{}.{}", T::PACKAGE, T::NAME)
+}
+
+impl Name for eventlog::Stage0Measurements {
+    const PACKAGE: &'static str = PACKAGE;
+    const NAME: &'static str = "Stage0";
+
+    fn type_url() -> String {
+        type_url_for::<Self>()
+    }
+}
+
+fn generate_event_log(measurements: eventlog::Stage0Measurements) -> eventlog::EventLog {
+    let mut event = eventlog::Event::default();
+    let mut str = String::new();
+    let any = Any::from_msg(&measurements);
+    str.push_str("Stage0");
+    let m = Some(str);
+    event.tag = m;
+    event.event = Some(any.unwrap());
+    let mut eventlog = eventlog::EventLog::default();
+    eventlog.events.push(event);
+    eventlog
+}
diff --git a/stage0_bin/Cargo.lock b/stage0_bin/Cargo.lock
index d562052d637..7ee9b87787a 100644
--- a/stage0_bin/Cargo.lock
+++ b/stage0_bin/Cargo.lock
@@ -37,6 +37,21 @@ dependencies = [
  "subtle",
 ]
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "anyhow"
+version = "1.0.82"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f538837af36e6f6a9be0faa67f9a314f8119e4e4b5867c6ab40ed60360142519"
+
 [[package]]
 name = "autocfg"
 version = "1.1.0"
@@ -82,6 +97,12 @@ version = "1.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
 
+[[package]]
+name = "bytes"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "514de17de45fdb8dc022b1a7975556c53c86f9f0aa5f534b98977b171857c2c9"
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -222,6 +243,12 @@ dependencies = [
  "signature",
 ]
 
+[[package]]
+name = "either"
+version = "1.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a47c1c47d2f5964e29c61246e81db715514cd532db6b5116a25ea3c03d6780a2"
+
 [[package]]
 name = "elf"
 version = "0.7.2"
@@ -246,6 +273,31 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "equivalent"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
+
+[[package]]
+name = "errno"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a258e46cdc063eb8519c00b9fc845fc47bcfca4130e2f08e88665ceda8474245"
+dependencies = [
+ "libc",
+ "windows-sys 0.52.0",
+]
+
+[[package]]
+name = "fastrand"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e51093e27b0797c359783294ca4f0a911c270184cb10f85783b118614a1501be"
+dependencies = [
+ "instant",
+]
+
 [[package]]
 name = "ff"
 version = "0.13.0"
@@ -256,6 +308,12 @@ dependencies = [
  "subtle",
 ]
 
+[[package]]
+name = "fixedbitset"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
+
 [[package]]
 name = "generic-array"
 version = "0.14.7"
@@ -305,12 +363,24 @@ version = "1.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eabb4a44450da02c90444cf74558da904edde8fb4e9035a9a6a4e15445af0bd7"
 
+[[package]]
+name = "hashbrown"
+version = "0.14.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5274423e17b7c9fc20b6e7e208532f9b19825d82dfd615708b70edd83df41f1"
+
 [[package]]
 name = "heck"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2540771e65fc8cb83cd6e8a237f70c319bd5c29f78ed1084ba5d50eeac86f7f9"
 
+[[package]]
+name = "hermit-abi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d231dfb89cfffdbc30e7fc41579ed6066ad03abda9e567ccafae602b97ec5024"
+
 [[package]]
 name = "hex"
 version = "0.4.3"
@@ -335,6 +405,16 @@ dependencies = [
  "digest",
 ]
 
+[[package]]
+name = "indexmap"
+version = "2.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "168fb715dda47215e360912c096649d23d58bf392ac62f73919e831745e40f26"
+dependencies = [
+ "equivalent",
+ "hashbrown",
+]
+
 [[package]]
 name = "inout"
 version = "0.1.3"
@@ -344,6 +424,35 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "instant"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a5bbe824c507c5da5956355e86a746d82e0e1464f65d862cc5e71da70e94b2c"
+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "io-lifetimes"
+version = "1.0.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eae7b9aee968036d54dce06cebaefd919e4472e753296daccd6d344e3e2df0c2"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "windows-sys 0.48.0",
+]
+
+[[package]]
+name = "itertools"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba291022dbbd398a455acf126c1e341954079855bc60dfdda641363bd6922569"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.144"
@@ -359,6 +468,12 @@ dependencies = [
  "spinning_top",
 ]
 
+[[package]]
+name = "linux-raw-sys"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ef53942eb7bf7ff43a617b3e2c1c4a5ecf5944a7c1bc12d7ee39bbb15e5c1519"
+
 [[package]]
 name = "lock_api"
 version = "0.4.9"
@@ -378,6 +493,18 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "memchr"
+version = "2.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c8640c5d730cb13ebd907d8d04b52f55ac9a2eec55b440c8892f40d56c76c1d"
+
+[[package]]
+name = "multimap"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "defc4c55412d89136f966bbb339008b474350e5e6e78d2714439c386b3137a03"
+
 [[package]]
 name = "oak_core"
 version = "0.1.0"
@@ -434,7 +561,7 @@ dependencies = [
 name = "oak_sev_snp_attestation_report"
 version = "0.0.0"
 dependencies = [
- "bitflags 1.3.2",
+ "bitflags 2.4.0",
  "static_assertions",
  "strum",
  "zerocopy",
@@ -458,6 +585,9 @@ dependencies = [
  "oak_sev_snp_attestation_report",
  "oak_stage0_dice",
  "p256",
+ "prost",
+ "prost-build",
+ "prost-types",
  "rand_core",
  "sev_serial",
  "sha2",
@@ -491,6 +621,12 @@ dependencies = [
  "zerocopy",
 ]
 
+[[package]]
+name = "once_cell"
+version = "1.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
+
 [[package]]
 name = "opaque-debug"
 version = "0.3.0"
@@ -509,6 +645,16 @@ dependencies = [
  "sha2",
 ]
 
+[[package]]
+name = "petgraph"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e1d3afd2628e69da2be385eb6f2fd57c8ac7977ceeff6dc166ff1657b0e386a9"
+dependencies = [
+ "fixedbitset",
+ "indexmap",
+]
+
 [[package]]
 name = "polyval"
 version = "0.6.1"
@@ -521,6 +667,16 @@ dependencies = [
  "universal-hash",
 ]
 
+[[package]]
+name = "prettyplease"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae005bd773ab59b4725093fd7df83fd7892f7d8eafb48dbd7de6e024e4215f9d"
+dependencies = [
+ "proc-macro2",
+ "syn 2.0.38",
+]
+
 [[package]]
 name = "primeorder"
 version = "0.13.2"
@@ -539,6 +695,59 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "prost"
+version = "0.12.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d0f5d036824e4761737860779c906171497f6d55681139d8312388f8fe398922"
+dependencies = [
+ "bytes",
+ "prost-derive",
+]
+
+[[package]]
+name = "prost-build"
+version = "0.12.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "80b776a1b2dc779f5ee0641f8ade0125bc1298dd41a9a0c16d8bd57b42d222b1"
+dependencies = [
+ "bytes",
+ "heck",
+ "itertools",
+ "log",
+ "multimap",
+ "once_cell",
+ "petgraph",
+ "prettyplease",
+ "prost",
+ "prost-types",
+ "regex",
+ "syn 2.0.38",
+ "tempfile",
+]
+
+[[package]]
+name = "prost-derive"
+version = "0.12.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "19de2de2a00075bf566bee3bd4db014b11587e84184d3f7a791bc17f1a8e9e48"
+dependencies = [
+ "anyhow",
+ "itertools",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.38",
+]
+
+[[package]]
+name = "prost-types"
+version = "0.12.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3235c33eb02c1f1e212abdbe34c78b264b038fb58ca612664343271e36e55ffe"
+dependencies = [
+ "prost",
+]
+
 [[package]]
 name = "quote"
 version = "1.0.33"
@@ -557,6 +766,44 @@ dependencies = [
  "getrandom",
 ]
 
+[[package]]
+name = "redox_syscall"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "567664f262709473930a4bf9e51bf2ebf3348f2e748ccc50dea20646858f8f29"
+dependencies = [
+ "bitflags 1.3.2",
+]
+
+[[package]]
+name = "regex"
+version = "1.10.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c117dbdfde9c8308975b6a18d71f3f385c89461f7b3fb054288ecf2a2058ba4c"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "86b83b8b9847f9bf95ef68afb0b8e6cdb80f498442f5179a29fad448fcc1eaea"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "adad44e29e4c806119491a7f06f03de4d1af22c3a680dd47f1e6e179439d1f56"
+
 [[package]]
 name = "rfc6979"
 version = "0.4.0"
@@ -567,6 +814,20 @@ dependencies = [
  "subtle",
 ]
 
+[[package]]
+name = "rustix"
+version = "0.37.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fea8ca367a3a01fe35e6943c400addf443c0f57670e6ec51196f71a4b8762dd2"
+dependencies = [
+ "bitflags 1.3.2",
+ "errno",
+ "io-lifetimes",
+ "libc",
+ "linux-raw-sys",
+ "windows-sys 0.48.0",
+]
+
 [[package]]
 name = "rustversion"
 version = "1.0.9"
@@ -728,6 +989,20 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "tempfile"
+version = "3.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "31c0432476357e58790aaa47a8efb0c5138f137343f3b5f23bd36a27e3b0a6d6"
+dependencies = [
+ "autocfg",
+ "cfg-if",
+ "fastrand",
+ "redox_syscall",
+ "rustix",
+ "windows-sys 0.48.0",
+]
+
 [[package]]
 name = "typenum"
 version = "1.16.0"
@@ -768,6 +1043,145 @@ version = "0.11.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
 
+[[package]]
+name = "windows-sys"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
+dependencies = [
+ "windows-targets 0.48.5",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
+dependencies = [
+ "windows-targets 0.52.5",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a2fa6e2155d7247be68c096456083145c183cbbbc2764150dda45a87197940c"
+dependencies = [
+ "windows_aarch64_gnullvm 0.48.5",
+ "windows_aarch64_msvc 0.48.5",
+ "windows_i686_gnu 0.48.5",
+ "windows_i686_msvc 0.48.5",
+ "windows_x86_64_gnu 0.48.5",
+ "windows_x86_64_gnullvm 0.48.5",
+ "windows_x86_64_msvc 0.48.5",
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diff --git a/stage0_bin/build.rs b/stage0_bin/build.rs
index e526062d6ab..cd7d6dcf08e 100644
--- a/stage0_bin/build.rs
+++ b/stage0_bin/build.rs
@@ -23,7 +23,7 @@ fn main() {
 
     #[allow(clippy::if_same_then_else)]
     if env::var("PROFILE").unwrap() == "release" {
-        println!("cargo:rustc-link-arg=--defsym=BIOS_SIZE=2M");
+        println!("cargo:rustc-link-arg=--defsym=BIOS_SIZE=256K");
     } else {
         println!("cargo:rustc-link-arg=--defsym=BIOS_SIZE=2M");
     }