『第
2 楼』:
以下代码是从网上找到的，但有几个地方(红色)不是很清楚，请大家指点：
#include <stdlib.h>
#include <dos.h>
#include <stdio.h>
#include <conio.h>
#include <bios.h>
char *GetAscii(unsigned int inData[], int offStart, int offEnd);
int main(void)
{
unsigned int diskData[256]; /* Disk data */
unsigned int offset; /* Disk data offset */
int loop;
int numDrv; /* Number of IDE hard drives */
union REGS registers;
unsigned int biosCyl[2]; /* Cylinders, Heads, Sectors */
unsigned int biosHead[2];
unsigned int biosSec [2];
numDrv = peekb(0x40, 0x75); /*0x40和0x75是从哪得到的？在哪里定义的？有什么标准文件说明吗？*/
for (loop = 0; loop < numDrv; loop++)
{
while (inp(0x01f7) != 0x50); /*0x50是从哪得到的？在哪里定义的？有什么标准文件说明吗？*/
outp(0x01f6, (loop == 0 ? 0xa0 : 0xb0)); /*0xa0和0xb0是从哪得到的？在哪里定义的？有什么标准文件说明吗？*/
outp(0x01f7, 0xec); /* Get drive info data */
while (inp(0x1f7) != 0x58); /*0x58是从哪得到的？在哪里定义的？有什么标准文件说明吗？*/
for (offset = 0; offset != 256; offset++) /* Read "sector" */
diskData[offset] = inpw(0x1f0);
/* Get BIOS drive info */
registers.h.ah = 0x08; /* Get drive info */
registers.h.dl = 0x80 + loop; /* Drive is 80H for Disk 0, 81H for Disk 1 */
int86(0x13, ®isters, ®isters);
if (!registers.x.cflag) /* All OK if carry not set */
{
biosHead[loop] = registers.h.dh + 1; /* Heads are from 0 */
biosSec[loop] = registers.h.cl & 0x3f; /* sec is bits 5 - 0 */
/* +1 because starts from 0 and +1 for FDISK leaving one out */
biosCyl[loop] = ((registers.h.cl & 0xc0) << 2) + registers.h.ch + 2;
} /* end of if */
printf("DRIVE %d:\n", loop);
printf("Model Number______________________: %s\n", GetAscii(diskData, 27, 46));
printf("Serial Number_____________________: %s\n", GetAscii(diskData, 10, 19));
printf("Controller Revision Number________: %s\n\n", GetAscii(diskData, 23, 26));
printf("Able to do Double Word Transfer___: %6s\n", (diskData[48] == 0 ? "No" : "Yes"));
printf("Controller type___________________: %04X\n", diskData[20]);
printf("Controller buffer size (bytes)____: %6u\n", diskData[21] * 512);
printf("Number of ECC bytes transferred___: %6u\n", diskData[22]);
printf("Number of sectors per interrupt___: %6u\n\n", diskData[47]);
printf("Hard Disk Reports\n");
printf("Number of Cylinders (Fixed)_______: %6u\n", diskData[1]);
printf("Number of Heads___________________: %6u\n", diskData[3]);
printf("Number of Sectors per Track_______: %6u\n\n", diskData[6]);
printf("BIOS Reports\n");
printf("Number of Cylinders_______________: %6u\n", biosCyl[loop]);
printf("Number of Heads___________________: %6u\n", biosHead[loop]);
printf("Number of Sectors per Track_______: %6u\n\n", biosSec[loop]);
printf("Press any key to continue...\n\n");
getch();
} /* end of for */
return 0;
} /* main() */
char *GetAscii(unsigned int inData[], int offStart, int offEnd)
{
static char retVal[255];
int loop, loop1;
for (loop = offStart, loop1 = 0; loop <= offEnd; loop++)
{
retVal[loop1++] = (char )(inData[loop] / 256); /* Get High byte */
retVal[loop1++] = (char )(inData[loop] % 256); /* Get Low byte */
} /* end of for */
retVal[loop1] = '\0'; /* Make sure it ends in a NULL character */
return retVal;
} /* GetAscii() */
我运行了以上代码，停在0X50和0X58那两个循环地方，不明白是怎么回事？哪位高手知道的，可否告诉我呢？谢谢！~~~
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