QEMU中的引导加载器靴子，即使启动签名错误

发布于 2025-02-04 20:06:32 字数 854 浏览 4 评论 0原文

我在QEMU中使用自己的bootloader播放X32位系统，并尝试从ISO文件中启动，而没有设置0xaa55作为该扇区的最后两个字节，而0x2233而不是而不是< br> 但是Qemu仍然启动并显示出与之前相同的结果没有正确的签名，QEMU不应该将我的磁盘视为可引导设备吗？它仍在启动如何？
这是我的bootloader.asm：

org     0x7c00              ; We are loaded by BIOS at 0x7C00
 
bits    16                  ; We are still in 16 bit Real Mode
 
Start:
 
    cli                 ; Clear all Interrupts
    hlt                 ; halt the system
    
times 510 - ($-$$) db 0             ; We have to be 512 bytes. Clear the rest of the bytes with 0
 
dw 0x2233                   ; Boot Signiture

我关注 iso要启动的文件，甚至尝试更改问题的ASM代码的签名，然后Qemu再次将其识别为可引导媒体，并打印为“这是我很酷的新OS！”在屏幕上

原文

I was playing around with my own bootloader in QEMU for x32 bit systems and tried booting from iso file with not setting 0xAA55 as the last two bytes of the sector and 0x2233 instead
But QEMU still booted and showed the same results as it did before
Without the correct signature shouldnt QEMU fail to recognize my disk as bootable device?
How is it still booting?
Heres my bootloader.asm :

org     0x7c00              ; We are loaded by BIOS at 0x7C00
 
bits    16                  ; We are still in 16 bit Real Mode
 
Start:
 
    cli                 ; Clear all Interrupts
    hlt                 ; halt the system
    
times 510 - ($-$) db 0             ; We have to be 512 bytes. Clear the rest of the bytes with 0
 
dw 0x2233                   ; Boot Signiture

I followed this question to make the iso file to boot from and even tried with changing the signature of asm code of the question, and QEMU again recognized it as a bootable media and printed "This is my cool new OS!" on screen

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