rwdisk.c

来自「用于汇编领域的,运用于OS的MAIN函数.基于硬件基础的源代码」· C语言 代码 · 共 57 行

// read, write for disk
#include "fs.h"
int comp_sect_num(int n){
// what is the starting sect num for block n?
   return n*SECT_PER_BLOCK;
}
void dump_sector(int s, char *buf){
// dump sector s whose contents are in buf
   int i,j,k; unsigned long * temp=(unsigned long *)buf;

   printk("dumping sector %d\n",s);
   k=0;
   for(i=0;i<8;i++){
      printk("%d-th portion\n",i);
      for(j=0;j<32;j++) printk("%x ",temp[k++]);
      printk("\n");
      wait_for_anykey();
   }
}
void test_disk(){
// scan all sectors
   int i;char buf[512];
   printk("dumping first 32 bytes of all sectors\n");
   for(i=0;;i++){
      ReadRelativeSector(i, buf, buf);
	  dump_sector(i, buf);
   }
}
      
void ReadDiskBlock(int n, char * buf){
// read blk no n from disk into buf. blk size is 4kB
// 4kB is 8 sectors

   int s = comp_sect_num(n);
   int i; char *temp = buf;
   //test_disk();
   for(i=0;i<SECT_PER_BLOCK;i++){
      ReadRelativeSector(s, temp,temp);
	  //dump_sector(s,temp);
	  s=s++;
	  temp = temp + 512;
   }
}

void WriteDiskBlock(int n, char * buf){
// write the contents of buf into block n
   int s = comp_sect_num(n);
   int i; char *temp = buf;
   for(i=0;i<SECT_PER_BLOCK;i++){
      WriteRelativeSector(s, temp, temp);
	  s++;
	  temp = temp + 512;
   }
}