kernel_init.c

来自「操作系统试验！通过这个试验」· C语言 代码 · 共 64 行

#include <multiboot.h>    	/* for boot_info */
#include <lmm.public.h>		/* for lmm_remove_free() */
#include <stdio.h>		/* for lprintf_kern() */

#include <x86/seg.h>		/* for install_user_segs() */
#include <x86/pic.h>      	/* for pic_init() */
#include <x86/base_irq.h> 	/* for base_irq_master/slave */
#include <x86/pio.h>
#include <interrupts.h>
#include <timer_defines.h>
#include <kernel_init.h>
#include <keyhelp.h>

extern lmm_t malloc_lmm;		/* state for kernel memory allocation. */
extern struct multiboot_info boot_info;	/* Info about system gathered by the boot loader */

void kernel_init()
{
	/*
	* Tell the kernel memory allocator which memory it can't use.
	* It already knows not to touch kernel image.
	*/
	lmm_remove_free( &malloc_lmm, (void*)USER_MEM_START, USER_MEM_SIZE );
	lmm_remove_free( &malloc_lmm, (void*)0, 0x100000 );
	
	/*
	 * init the PIC so that IRQs and exception handlers
	 * don't overlap in the IDT.
	 */
	pic_init( BASE_IRQ_MASTER_BASE, BASE_IRQ_SLAVE_BASE );
	
	/*
	 * Install interrupt handler
	 */
	/* ... */

	/* 
	 * Programmable Interval Timer here.
	 * 
	 */
	/* ... */
}

unsigned int keyboard_handler(struct trap_state *ts)
{
	/*Your keyboard handler*/
	/* ... */

	return 0;
}

unsigned int timer_handler(struct trap_state *ts)
{
	/* Your timer handler here*/
	/* ... */

	return 0;
}

char readchar()
{
	return 0;
}