移动文本模式光标不工作 [英] Moving text mode cursor not working

问题描述

我一直在操作系统中我目前正在开发移动文本模式光标。我无法得到它显示在所有。下面是我用更新光标code：

I have been working on moving the text mode cursor in the operating system I am currently developing. I am having trouble getting it to show up at all. Here is the code that I use to update the cursor:

   void update_cursor()
    {
        unsigned char cursor_loc = (y_pos*Cols)+x_pos;
         // cursor LOW port to vga INDEX register
        outb(0x3D4, 0x0F);
        outb(0x3D5, (unsigned char)(cursor_loc));
        // cursor HIGH port to vga INDEX register
        outb(0x3D4, 0x0E);
        outb(0x3D5, (unsigned char)((cursor_loc>>8)));


    }
   static inline void outb(unsigned short port, unsigned char value)
   {
      asm volatile ( "outb %0, %1" : : "a"(value), "Nd"(port) );

    }
    static inline unsigned char inb(unsigned short port)
    {
       unsigned char ret;
       asm volatile ( "inb %1, %0" : "=a"(ret) : "Nd"(port) );

       return ret;
    }

我用gcc版本4.8.3（GCC）编译我的主要文件。我完全失去了。任何人有任何建议，什么可能是这个问题吗？
如果你想看到完整的源代码就位于这里： https：//开头github.com/AnonymousUser1337/Anmu/blob/master/Kernel/ke​​rnel.cpp

修改：我使用虚拟框运行

先谢谢了。

推荐答案

您选择错了VGA寄存器。你必须使用为0x0F为低，为0x0E高（你必须0x0A的两个）。

You select wrong VGA registers. You have to use 0x0F for low and 0x0E for high (you have 0x0A for both).

编辑：如果你的光标被禁用，这是如何实现的：

In case your cursor is disabled, this is how to enable it:

void enable_cursor() {
    outb(0x3D4, 0x0A);
    char curstart = inb(0x3D5) & 0x1F; // get cursor scanline start

    outb(0x3D4, 0x0A);
    outb(0x3D5, curstart | 0x20); // set enable bit
}

另外，请查阅此链接用于寄存器数量和用途名单。

Also check this link for list of register numbers and usages.

EDIT2：您的光标所在位置的变量是不够宽，存储光标位置。 unsigned char型cursor_loc 应无符号短cursor_loc 。

Your cursor location variable is not wide enough to store the cursor location. unsigned char cursor_loc should be unsigned short cursor_loc.

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