32、块驱动与网络接口卡驱动技术解析

块驱动与网络接口卡驱动技术解析

块驱动相关内容

块驱动在存储系统中起着关键作用，下面将详细介绍块驱动的相关操作、高级特性、调试方法以及关键数据结构和编程接口。

基本写扇区操作

以下是一个基本的写扇区操作代码示例：

/* Issue Write Sector Command */
outb(WRITE_SECTOR_CMD, COMMAND_REGISTER);
/* Traverse all requested sectors, byte by byte */
for (i = 0; i < 512*req->nr_sectors; i++) {
  /* Wait until the disk is ready. Busy duration should be 
     in the order of microseconds. Sitting in a tight loop 
     for simplicity; more intelligence required in the real 
     world */
  while ((status = inb(STATUS_REGISTER)) & BUSY_STATUS);
  /* Write data to disk from the buffer associated with the
     request */
  outb(req->buffer[i], DATA_REGISTER);
}
good = 1;
break;
}
}
end_request(req, good);