basdrvpa.c

用基本13中断获取硬盘参数,获取硬盘参数的纯C语言程序

/* 用基本13中断获取硬盘参数 */

#include <dos.h>
#include <stdio.h>
int int13DriveParameter(unsigned int driveNum,
						unsigned long *maxCylinder,
						unsigned long *maxHead,
						unsigned long *maxSector,
						unsigned long *totalSector)
{
    unsigned long cylinder=0;
    unsigned long head=0;
    unsigned long sector=0;
    unsigned long totalSectorVar=0;
    union REGS regs;
    regs.h.ah=0x08;
    regs.h.dl=driveNum;
    int86(0x13,&regs,&regs); /*调用中断*/
	
	if(regs.h.ah!=0) return regs.h.ah;
	
	if(regs.h.bl==0x01) printf("This is 360KB model.\n");
	if(regs.h.bl==0x02) printf("This is 1.2MB model.\n");
	if(regs.h.bl==0x03) printf("This is 720KB model.\n");
	if(regs.h.bl==0x04) printf("This is 1.44MB model.\n");
	
	/* 需先读取这些值，再赋给后面的变量，否则无效，不知何故 */
	cylinder=((((unsigned int)regs.h.cl)>>6<<8) | regs.h.ch) + 1;
	head=regs.h.dh+1;
	sector=regs.h.cl & 0x3F;
	totalSectorVar=(unsigned long)cylinder * (unsigned long)head * (unsigned long)sector;
	
	printf("Cylinders=%lu Heads=%lu Sectors=%lu\nTotal sectors=%lu (%lu MB)\n\n",
		cylinder,head,sector,totalSectorVar,totalSectorVar/2/1024);
	
	*maxCylinder=cylinder;
	*maxHead=head;
	*maxSector=sector;
	*totalSector=totalSectorVar;
	return 0;
}