如何使用程序集(NASM)引导装载器编译Rust内核

sudo apt-get install nasm

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
source $HOME/.cargo/env

; boot.asm
BITS 16
ORG 0x7C00

start:
    ; 设置段寄存器
    xor ax, ax
    mov ds, ax
    mov es, ax
    mov ss, ax
    mov sp, 0x7C00

    ; 加载第二阶段引导装载器或内核
    mov si, msg
    call print_string

    ; 无限循环
hang:
    jmp hang

print_string:
    mov ah, 0x0E
.next_char:
    lodsb
    cmp al, 0
    je .done
    int 0x10
    jmp .next_char
.done:
    ret

msg db 'Hello, World!', 0

times 510-($-$$) db 0
dw 0xAA55

nasm -f bin boot.asm -o boot.bin

cargo new --bin kernel
cd kernel

[package]
name = "kernel"
version = "0.1.0"
authors = ["Your Name <you@example.com>"]
edition = "2018"

[dependencies]

[profile.dev]
panic = "abort"

[profile.release]
panic = "abort"

#![no_std]
#![no_main]

use core::panic::PanicInfo;

#[no_mangle]
pub extern "C" fn _start() -> ! {
    loop {}
}

#[panic_handler]
fn panic(_info: &PanicInfo) -> ! {
    loop {}
}

[target.x86_64-unknown-none]
runner = "bootimage runner"
rustflags = [
  "-C", "link-arg=-Tlinker.ld",
]

[build]
target = "x86_64-unknown-none"

ENTRY(_start);

SECTIONS
{
    . = 0x100000;

    .text :
    {
        *(.text._start)
        *(.text*)
    }

    .rodata :
    {
        *(.rodata*)
    }

    .data :
    {
        *(.data*)
    }

    .bss :
    {
        *(.bss*)
    }
}

cargo build --release

dd if=/dev/zero of=boot.img bs=512 count=93750
dd if=boot.bin of=boot.img conv=notrunc
dd if=target/x86_64-unknown-none/release/kernel of=boot.img bs=512 seek=1 conv=notrunc

qemu-system-x86_64 -drive format=raw,file=boot.img