陷入困境并进入实模式(低级汇编语言编程) [英] Grub and getting into Real Mode (low-level assembly language programming)

问题描述

我一直在研究玩具OS，并一直使用grub作为引导加载程序.最近，当尝试使用VGA时，我发现我无法使用硬件中断.我发现这是因为我被grub误入了保护模式.

I've been working on a toy OS and have been using grub as my boot loader. Recently when trying to use VGA I found that I couldn't use hardware interrupts. This I found was because I had been slung into protected mode by grub.

有人知道如何在不摆脱grub的情况下回到实模式吗?

Does anybody know how to get back into real mode without having to get rid of grub?

推荐答案

您的意思是writeport(value，$ 3c9)?

you mean writeport(value,$3c9)?

>mov 03c9,AH
>out value,AL

或类似intel asm(NASM)

or similar in INTEL asm(NASM)

3c9 3c8 IIRC是VGA寄存器.

3c9 3c8 IIRC are VGA registers.

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