initial commit uwu

.cargo/config.toml

@@ -0,0 +1,6 @@
+[build]
+target = "config/x86-pc-none.json"
+
+[unstable]
+build-std-features = ["compiler-builtins-mem"]
+build-std = ["core", "compiler_builtins"]

.gitignore

@@ -0,0 +1,6 @@
+/.idea
+/.vscode
+/target
+
+# raw disk files used for development
+/*.img

Cargo.lock

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

Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "bussy"
+version = "0.1.0"
+edition = "2021"
+
+[profile.dev]
+panic = "abort"
+
+[profile.release]
+panic = "abort"

config/stage0.ld

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+OUTPUT_FORMAT(elf32-i386)
+ENTRY(_start)
+
+SECTIONS {
+	. = 0x7c00;
+
+	.text : {
+		*(.text .text.*)
+	}
+
+	.data : {
+		*(.data .data.*)
+	}
+
+	.rodata : {
+		*(.rodata)
+	}
+
+	. = 0x7db8;
+	.header : {
+		KEEP(*(.header))
+	}
+
+	. = 0x7e00;
+	.bss(NOLOAD) : {
+		*(.bss .bss.*)
+	}
+}

config/x86-pc-none.json

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+{
+    "arch": "x86",
+    "cpu": "i386",
+    "data-layout": "e-m:e-i32:32-f80:128-n8:16:32-S128-p:32:32",
+    "dynamic-linking": false,
+    "executables": true,
+    "linker-flavor": "ld.lld",
+    "linker": "rust-lld",
+    "llvm-target": "i386-pc-none",
+    "max-atomic-width": 64,
+    "position-independent-executables": false,
+    "disable-redzone": true,
+    "target-c-int-width": "32",
+    "target-pointer-width": "32",
+    "target-endian": "little",
+    "panic-strategy": "abort",
+    "os": "none",
+    "vendor": "pc",
+    "relocation-model": "static",
+    "features": "-sse,-mmx,+soft-float"
+}

rust-toolchain.toml

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+[toolchain]
+channel = "nightly"
+components = ["rustfmt", "clippy", "rust-src", "llvm-tools-preview"]
+targets = ["x86-pc-none"]

src/main.rs

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+#![no_std]
+#![no_main]
+
+use core::arch::asm;
+use core::panic::PanicInfo;
+
+#[no_mangle]
+pub extern "C" fn main() -> ! {
+    panic!();
+}
+
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    unsafe {
+        asm!(
+            "1: cli",
+            "   hlt",
+            "   jmp 1b", // NMI may resume the CPU or something, idk
+            options(att_syntax)
+        );
+    }
+
+    unreachable!()
+}