操作系统-在c内核保护模式下无法获得键盘输入

Question

我正在制作C和32位汇编操作系统，遵循James Molloy的教程，直到IRQs和PIT步骤，我试图获得键盘输入，我尝试将此代码添加到教程代码中，但我无法得到正确的东西。

Keyboard.c:

#include "keyboard.h"
#include "common.h"
#include "monitor.h"
#include "isr.h"
//Keyboard Layout USA
unsigned char kblayout[128] =
{
    0,  27, '1', '2', '3', '4', '5', '6', '7', '8', /* 9 */
   '9', '0', '-', '=', 'b',    /* Backspace */
    't',           /* Tab */
     'q', 'w', 'e', 'r',    /* 19 */
     't', 'y', 'u', 'i', 'o', 'p', '[', ']', 'n',  /* Enter key */
    0,          /* 29   - Control */
  'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', /* 39 */
 ''', '`',   0,        /* Left shift */
 '\', 'z', 'x', 'c', 'v', 'b', 'n',            /* 49 */
  'm', ',', '.', '/',   0,              /* Right shift */
  '*',
    0,  /* Alt */
  ' ',  /* Space bar */
    0,  /* Caps lock */
    0,  /* 59 - F1 key ... > */
    0,   0,   0,   0,   0,   0,   0,   0,
    0,  /* < ... F10 */
    0,  /* 69 - Num lock*/
    0,  /* Scroll Lock */
    0,  /* Home key */
    0,  /* Up Arrow */
    0,  /* Page Up */
   '-',
    0,  /* Left Arrow */
    0,
    0,  /* Right Arrow */
   '+',
    0,  /* 79 - End key*/
    0,  /* Down Arrow */
    0,  /* Page Down */
    0,  /* Insert Key */
    0,  /* Delete Key */
    0,   0,   0,
    0,  /* F11 Key */
    0,  /* F12 Key */
    0,  /* All other keys are undefined */
};      

unsigned int restart_keyboard()
{    
   int data = inb(0x61);     
   outb(0x61,data | 0x80);//Disables the keyboard  
   outb(0x61,data & 0x7F);//Enables the keyboard  
   return 0;
}

unsigned char get_scancode()
{
    unsigned char inputdata;
    inputdata = inb(0x60);
    return inputdata;
}
static void keyboard_handler(registers_t regs)
{ 
     unsigned char scancode; 
     unsigned int shift_key = 0;
     scancode = get_scancode();
     if(scancode == 0x2A)     
     {  
          shift_key = 1;//Shift key is pressed
     }      
     else if(scancode & 0xAA)   
     {  
          int shift_key= 0;//Shift Key is not pressed
     }      
     else    
     {          
         if (scancode & 0x80)   
         {  
              int shiftaltctrl = 1;//Put anything to see what special keys were pressed  
         }
         else
         {   
              monitor_put(kblayout[scancode]); //Prints the character which was     pressed         
         }     
     }
}
void keyboard_install()
{
register_interrupt_handler(33, keyboard_handler);
}

main.c:内核

#include "monitor.h"
#include "descriptor_tables.h"
#include "timer.h"
#include "keyboard.h"
int main(struct multiboot *mboot_ptr)
{
    // Initialise all the ISRs and segmentation
    init_descriptor_tables();
    // Initialise the screen (by clearing it)
    monitor_clear();
    // Write out a sample string
    monitor_write("Hello, world!n");
    keyboard_install();
    return 0;
}

所有其他文件都是相同的。它运行正常，但它不打印输出，我不知道为什么:(我正在用qemu运行这个。

它打印hello world但不打印击键

Answer 1

问题是我在内核启动代码中禁用中断后没有恢复中断，我使用asm voltile("sti")