do_timer.c

阿基米德操作系统的源代码

//////////////////////////////////////////////////////////////////////////
#include "general.h"
#include "inb_outb.h"

#include "hd_info_struct.h"
#include "dir_entry.h"
#include "msdos_dir_entry.h"
#include "d_inode.h"
#include "m_inode.h"
#include "buffer_head.h"
#include "fat_cache.h"
#include "file.h"
#include "hd_request_struct.h"
#include "super_block.h"

#include "common_head.h"
//////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////
void inc_datetime(void)
{
	current_datetime_sec++;
	if (current_datetime_sec < 60)
		return;
	current_datetime_sec = 0;
	current_datetime_min++;
	if (current_datetime_min < 60)
		return;
	current_datetime_min = 0;
	current_datetime_hour++;
	if (current_datetime_hour < 24)
		return;
	current_datetime_hour = 0;
	current_datetime_mday++;
	if (current_datetime_mday < current_monthdays)
		return;
	current_datetime_mday = 0;
	current_datetime_mon++;
	if (current_datetime_mon == 12)
		current_datetime_mon = 0;
	current_monthdays = month_days[current_datetime_mon];
	if (current_datetime_mon == 1)
		current_monthdays = current_monthdays + leapyear_flag;
	if (current_datetime_mon)
		return;
	current_datetime_year++;
	if (current_datetime_year == 100)
	{
		current_datetime_year = 0;
		current_datetime_100Y++;
	}
	leapyear_flag	= 1;
	if ((current_datetime_year & 0x03) || ((current_datetime_100Y == 21) && (current_datetime_year == 00)))
		leapyear_flag = 0;

	return;
}

void do_timer(void)
{
	sys_datetime_ms++;
	if (sys_datetime_ms == 100)
	{
		sys_datetime_ms = 0;
		sys_datetime_s	= sys_datetime_s ^ 0x01;
		sys_datetime++;

		inc_datetime();
		if (!sys_datetime_s)
			file_datetime	=	((current_datetime_100Y * 100 + current_datetime_year - 1980) << 25)|
								((current_datetime_mon + 1) << 21)									| 
								((current_datetime_mday + 1) << 16)									|
								(current_datetime_hour << 11)										| 
								(current_datetime_min << 5)											| 
								(current_datetime_sec >> 1);
	}

	if (floppy_timerval)
	{
		floppy_timerval--;
		if (!floppy_timerval)
		{
			if (floppy_state == 3)
			{
				floppy_state	= 5;
				floppy_timerval = FD_DRIVER_DOWN;
				output_byte(FD_RECALIBRATE);
				output_byte(0x00);
			}
			else
			{
				floppy_state		= 2;
				floppy_errors		= 0;
				floppy_rwerrors		= 0;
				floppy_finishedflag = 0;
				outb_p(0x0c,FD_DOR);
			}

			return;
		}
	}
	
	return;
}
///////////////////////////////////////////////////////////