add stage1 skeleton

Cargo.lock

@@ -4,4 +4,8 @@ version = 3
 
 [[package]]
 name = "bussy"
-version = "0.1.0"
+version = "0.1.0"
+
+[[package]]
+name = "bussy-stage1"
+version = "0.1.0"

Cargo.toml

@@ -1,10 +1,30 @@
 [package]
 name = "bussy"
-version = "0.1.0"
 edition = "2021"
+version.workspace = true
+repository.workspace = true
+
+[workspace]
+members = [
+    "stage1"
+]
+
+[workspace.package]
+version = "0.1.0"
+repository = "https://git.bsd.gay/fef/bussy"
 
 [profile.dev]
 panic = "abort"
+opt-level = "s"
+lto = true
+codegen-units = 1
+debug = true
+overflow-checks = true
 
 [profile.release]
 panic = "abort"
+opt-level = "s"
+lto = true
+codegen-units = 1
+debug = true
+overflow-checks = false

stage1/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "stage1"
+version = "0.1.0"

stage1/Cargo.toml

@@ -0,0 +1,5 @@
+[package]
+name = "bussy-stage1"
+edition = "2021"
+version.workspace = true
+repository.workspace = true

stage1/build.rs

@@ -0,0 +1,8 @@
+use std::path::Path;
+
+fn main() {
+    let manifest_dir = Path::new(env!("CARGO_MANIFEST_DIR"));
+
+    let ld_script_path = manifest_dir.join("stage1.ld");
+    println!("cargo:rustc-link-arg=--script={}", ld_script_path.display());
+}

stage1/src/main.rs

@@ -0,0 +1,19 @@
+#![no_std]
+#![no_main]
+
+use core::arch::asm;
+use core::panic::PanicInfo;
+
+#[no_mangle]
+pub extern "C" fn main() -> ! {
+    loop {}
+}
+
+#[panic_handler]
+pub fn rust_panic(_info: &PanicInfo) -> ! {
+    loop {
+        unsafe {
+            asm!("cli", "hlt");
+        }
+    }
+}

stage1/stage1.ld

@@ -0,0 +1,32 @@
+OUTPUT_FORMAT(elf32-i386)
+ENTRY(_start)
+
+SECTIONS {
+	. = 0x0500;
+
+	_stage1_start = .;
+
+	.header : {
+		KEEP(*(.header))
+	}
+
+	.text : ALIGN(8) {
+		*(.text .text.*)
+	}
+
+	.data : ALIGN(8) {
+		*(.data .data.*)
+	}
+
+	.rodata : ALIGN(8) {
+		*(.rodata .rodata.*)
+	}
+
+	_stage1_end = .;
+
+	.bss(NOLOAD) : ALIGN(8) {
+		_bss_start = .;
+		*(.bss .bss.*)
+		_bss_end = .;
+	}
+}