initial

.gitignore

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+/target
+/build

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.25)
+
+project(EOS0 CXX)
+
+include(FetchContent)
+FetchContent_Declare(
+    Corrosion
+    GIT_REPOSITORY https://github.com/corrosion-rs/corrosion.git
+    GIT_TAG v0.4 # Optionally specify a commit hash, version tag or branch here
+)
+FetchContent_MakeAvailable(Corrosion)
+
+corrosion_import_crate(MANIFEST_PATH kernel/Cargo.toml)

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "kernel"
+version = "0.1.0"

Cargo.toml

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+workspace.members = ["kernel"]
+workspace.resolver = "2"

README.md

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+References:
+
+- https://lowenware.com/blog/aarch64-bare-metal-program-in-rust/

aarch64-qemu.ld

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+ENTRY(_start)
+SECTIONS
+{
+    . = 0x40080000;
+    .text.boot : { *(.text.boot) }
+    .text : { *(.text) }
+    .data : { *(.data) }
+    .rodata : { *(.rodata) }
+    .bss : { *(.bss) }
+
+    . = ALIGN(8);
+    . = . + 0x4000;
+    LD_STACK_PTR = .;
+}

aarch64-unknown-none.json

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+{
+  "arch": "aarch64",
+  "crt-objects-fallback": "false",
+  "data-layout": "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128",
+  "disable-redzone": true,
+  "features": "+v8a,+strict-align,+neon,+fp-armv8",
+  "linker": "rust-lld",
+  "linker-flavor": "gnu-lld",
+  "llvm-target": "aarch64-unknown-none",
+  "max-atomic-width": 128,
+  "panic-strategy": "abort",
+  "pre-link-args": {
+    "gnu": [
+      "--fix-cortex-a53-843419"
+    ],
+    "gnu-lld": [
+      "--fix-cortex-a53-843419",
+      "-Taarch64-qemu.ld"
+    ],
+    "ld.lld": [
+      "-Taarch64-qemu.ld"
+    ]
+  },
+  "relocation-model": "static",
+  "stack-probes": {
+    "kind": "inline"
+  },
+  "supported-sanitizers": [
+    "kcfi",
+    "kernel-address"
+  ],
+  "target-pointer-width": "64"
+}

kernel/Cargo.toml

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+[package]
+name = "kernel"
+version = "0.1.0"
+edition = "2021"
+
+profile.dev.panic = "abort"
+profile.release.panic = "abort"
+
+# [lib]
+# crate-type = ["staticlib"]
+
+[dependencies]

kernel/src/main.rs

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+#![no_std]
+#![no_main]
+
+use core::{arch::global_asm, ptr};
+
+mod panic;
+
+global_asm!(include_str!("start.s"));
+
+#[no_mangle]
+pub extern "C" fn not_main() {
+    const UART0: *mut u8 = 0x0900_0000 as *mut u8;
+    let out_str = b"AArch64 Bare Metal";
+    for byte in out_str {
+        unsafe {
+            ptr::write_volatile(UART0, *byte);
+        }
+    }
+}

kernel/src/panic.rs

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+use core::panic::PanicInfo;
+
+#[panic_handler]
+fn on_panic(_info: &PanicInfo) -> ! {
+    loop {}
+}

kernel/src/start.s

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+.globl _start
+.extern LD_STACK_PTR
+
+.section ".text.boot"
+
+_start:
+    ldr     x30, =LD_STACK_PTR
+    mov     sp, x30
+    bl      not_main
+
+.equ PSCI_SYSTEM_OFF, 0x84000008
+.globl system_off
+system_off:
+    ldr     x0, =PSCI_SYSTEM_OFF
+    hvc     #0

run.sh

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+exec qemu-system-aarch64 -machine virt \
+  -m 1024M \
+  -cpu cortex-a53 \
+  -nographic \
+  -kernel target/aarch64-unknown-none/debug/kernel

rust-toolchain

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+nightly