Completed code to build for a custom architecture that is independent of linux etc

.gitignore

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+/target
+**/*.rs.bk

Cargo.lock

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+[[package]]
+name = "os_boot"
+version = "0.1.0"
+

Cargo.toml

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+[package]
+name = "os_boot"
+version = "0.1.0"
+authors = ["ishanjain28 <ishanjain28@gmail.com>"]
+
+[dependencies]

src/main.rs

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+#![feature(panic_implementation)] // required to define panic handler
+#![no_std] // don't include rust std lib
+#![no_main] // disable all rust entry point
+
+use core::panic::PanicInfo;
+
+/// This function is called on panic.
+#[panic_implementation]
+#[no_mangle]
+pub fn panic(_info: &PanicInfo) -> ! {
+    loop {}
+}
+
+#[no_mangle] // don't change the name of function in symbol table
+pub extern "C" fn _start() -> ! {
+    loop {}
+}

x86_64-os.json

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+{
+    "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"
+}