1 ATA寄存器 1.1 PCI IDE Primary IDE controller: 1F0h to 1F7h and 3F6h to 3F7h Secondary IDE controller: 170h to 177h and 376h to 377h BAR0: Base address of primary channel (I/O space), if it is 0x0 or 0x1, the port is 0x1F0. BAR1: Base address of primary channel control port (I/O space), if it is 0x0 or 0x1, the port is 0x3F6. BAR2: Base address of secondary channel (I/O space), if it is 0x0 or 0x1, the port is 0x170. BAR3: Base address of secondary channel control port, if it is 0x0 or 0x1, the port is 0x376. BAR4: Bus Master IDE; refers to the base of I/O range consisting of 16 ports. Each 8 ports controls DMA on the primary and secondary channel respectively. BAR5：SATA AHCI Base Address SATA AHCI模式使用的BAR5和IDE模式使用的BAR0-BAR4是互斥的，只能二选一。 Figure 1-1 PCI Header
1.2 寄存器描述 1F0 (Read and Write): Data Register 1F1 (Read): Error Register 1F1 (Write): Features Register 1F2 (Read and Write): Sector Count Register 1F3 (Read and Write): LBA Low Register 1F4 (Read and Write): LBA Mid Register 1F5 (Read and Write): LBA High Register 1F6 (Read and Write): Drive/Head Register 1F7 (Read): Status Register 1F7 (Write): Command Register 3F6 (Read): Alternate Status Register 3F6 (Write): Device Control Register 1.3 ATA模式识别 读取4个寄存器的值（"Sector Count" and "LBA Low,Mid,High" registers） ATA：0x01, 0x01, 0x00, 0x00 ATAPI：0x01, 0x01, 0x14, 0xEB 2 ATAPI SFF-8070i 1）选择master或者slave磁盘（一个PCI IDE控制器最多支持4个port，一个PCI SATA控制器最多支持32个port），写入寄存器Drive/Head（1F6） 2）写PIO或者DMA模式到feature寄存器（1F1） 3）写扇区尺寸到LBA Mid和High寄存器（1F4和1F5） 4）IDE偏移07的命令寄存器（1F7）写入0xA0（ATA_CMD_PACKET） 5）写12字节的SCSI包到数据寄存器（1F0），等待IDE中断 6）从LBA Mid和High读取本次传输的字节 7）从数据寄存器（1F0）读，或者往数据寄存器（1F0）写数据，等待中断 3 USB To ATA/ATAPI Bridge SFF-8070i/ATAPI BOT：0x08/0x05/0x50 4 机械硬盘主控 4.1 AVAGO TTTNS44310 4.2 LSI B5502D0 4.3 马达芯片 STM SMOOTH L7232 5 URLs AT89C51SND1C https://m.book118.com/html/2018/0523/168173987.shtm?from=mip ATAPI https://wiki.osdev.org/ATAPI PCI IDE Controller https://wiki.osdev.org/PCI_IDE_Controller 6 Abbreviations MMC-2：SCSI Multimedia Commands-2 SFF-8020i：Small Form Factor Committee，小型化委员会
