Move bios boot sector build to top level build script

Author: phil-opp

bios/build.rs

@@ -4,16 +4,22 @@ use std::{
 };
 
 const BOOTLOADER_X86_64_UEFI_VERSION: &str = "0.1.0-alpha.0";
+const BOOTLOADER_X86_64_BIOS_BOOT_SECTOR_VERSION: &str = "0.1.0-alpha.0";
 
 fn main() {
     let out_dir = PathBuf::from(std::env::var("OUT_DIR").unwrap());
 
     let uefi_path = build_uefi_bootloader(&out_dir);
-
     println!(
         "cargo:rustc-env=UEFI_BOOTLOADER_PATH={}",
         uefi_path.display()
     );
+
+    let bios_boot_sector_path = build_bios_boot_sector(&out_dir);
+    println!(
+        "cargo:rustc-env=BIOS_BOOT_SECTOR_PATH={}",
+        bios_boot_sector_path.display()
+    );
 }
 
 fn build_uefi_bootloader(out_dir: &Path) -> PathBuf {
@@ -46,3 +52,40 @@ fn build_uefi_bootloader(out_dir: &Path) -> PathBuf {
         panic!("failed to build uefi bootloader");
     }
 }
+
+fn build_bios_boot_sector(out_dir: &Path) -> PathBuf {
+    let cargo = std::env::var("CARGO").unwrap_or_else(|_| "cargo".into());
+    let mut cmd = Command::new(cargo);
+    cmd.arg("install").arg("bootloader-x86_64-bios-boot-sector");
+    let local_path = Path::new(env!("CARGO_MANIFEST_DIR"))
+        .join("bios")
+        .join("boot_sector");
+    if local_path.exists() {
+        // local build
+        cmd.arg("--path").arg(&local_path);
+    } else {
+        cmd.arg("--version")
+            .arg(BOOTLOADER_X86_64_BIOS_BOOT_SECTOR_VERSION);
+    }
+    cmd.arg("--locked");
+    cmd.arg("--target").arg("x86-16bit.json");
+    cmd.arg("--profile").arg("first-stage");
+    cmd.arg("-Zbuild-std=core")
+        .arg("-Zbuild-std-features=compiler-builtins-mem");
+    cmd.arg("--root").arg(out_dir);
+    let status = cmd
+        .status()
+        .expect("failed to run cargo install for bios boot sector");
+    if status.success() {
+        let path = out_dir
+            .join("bin")
+            .join("bootloader-x86_64-bios-boot-sector");
+        assert!(
+            path.exists(),
+            "bios boot sector executable does not exist after building"
+        );
+        path
+    } else {
+        panic!("failed to build bios boot sector");
+    }
+}