minimal rust kernel compiling but not working yet

asm/README.md

@@ -0,0 +1,4 @@
+Assembly Bootloader
+=====
+
+Following [3zanders](http://3zanders.co.uk/2017/10/16/writing-a-bootloader2/)

sar_ros/.cargo/config.toml

@@ -0,0 +1,9 @@
+[build]
+target = "x86_64-sar_ros.json"
+
+[target.'cfg(target_os = "none")']
+runner = "bootimage runner"
+
+[unstable]
+build-std-features = ["compiler-builtins-mem"]
+build-std = ["core", "compiler_builtins"]

sar_ros/Cargo.lock

@@ -0,0 +1,16 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "bootloader"
+version = "0.9.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6e02311b16c9819e7c72866d379cdd3026c3b7b25c1edf161f548f8e887e7ff"
+
+[[package]]
+name = "sar_os"
+version = "0.1.0"
+dependencies = [
+ "bootloader",
+]

sar_ros/Cargo.toml

@@ -0,0 +1,25 @@
+[package]
+name = "sar_os"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bootloader = "0.9.23"
+
+#[profile.dev]
+#panic = "abort"
+#
+#[profile.release]
+#panic = "abort"
+#
+#[package.metadata.bootimage]
+## The cargo subcommand that will be used for building the kernel.
+##
+## For building using the `cargo-xbuild` crate, set this to `xbuild`.
+#build-command = ["build"]
+## The command invoked with the created bootimage (the "{}" will be replaced
+## with the path to the bootable disk image)
+## Applies to `bootimage run` and `bootimage runner`
+#run-command = ["qemu-system-x86_64", "-drive", "format=raw,file={}"]

sar_ros/README.md

@@ -0,0 +1,4 @@
+Minimal Rust Kernel
+=======
+
+Following [Phil Opp's](https://os.phil-opp.com/minimal-rust-kernel/) minimal rust kernel tutorial

sar_ros/src/main.rs

@@ -0,0 +1,26 @@
+#![no_std]
+#![no_main]
+
+use core::panic::PanicInfo;
+
+/// This function is called on panic.
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    loop {}
+}
+
+static HELLO: &[u8] = b"Hello World!";
+
+#[no_mangle]
+pub extern "C" fn _start() -> ! {
+    let vga_buffer = 0xb8000 as *mut u8;
+
+    for (i, &byte) in HELLO.iter().enumerate() {
+        unsafe {
+            *vga_buffer.offset(i as isize * 2) = byte;
+            *vga_buffer.offset(i as isize * 2 + 1) = 0xb;
+        }
+    }
+
+    loop {}
+}

sar_ros/x86_64-sar_ros.json

@@ -0,0 +1,15 @@
+{
+  "llvm-target": "x86_64-unknown-none",
+  "data-layout": "e-m:e-i64:64-f80:128-n8:16:32:64-S128",
+  "arch": "x86_64",
+  "target-endian": "little",
+  "target-pointer-width": "64",
+  "target-c-int-width": "32",
+  "os": "none",
+  "executables": true,
+  "linker-flavor": "ld.lld",
+  "linker": "rust-lld",
+  "panic-strategy": "abort",
+  "disable-redzone": true,
+  "features": "-mmx,-sse,+soft-float"
+}