kdb允许用户控制内核代码的执行(包括内核扩展和设备驱动器)，并观察和修改变量和寄存器。

KDB allows the user to control execution of kernel code (including kernel extensions and device drivers), and to observe and modify the variables and register.

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通过对SCSI控制器相关寄存器的设置和SCSI协议扩展消息的交互，实现了主机存储通道的数据传输速度达到160MB/s。

The speed of data transfer between SCSI devices is upto 160MB/s implemented by the setting of registers in the SCSI controller and the intercourse of expended SCSI protocol messages.

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使用物理地址扩展位(PAE)，位于控制寄存器CR4的第五位。

Using the physical address extension (PAE) flag, located in bit 5 of control register CR4.

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