+ }
+
+ int device_state = HBA_RPxSSTS_IF(port->ssts);
+
+ kprintf("\t Port %d: %s (%x)\n",
+ i,
+ &sata_ifs[device_state],
+ port->regs[HBA_RPxSIG]);
+
+ struct hba_device* dev_info = port->device;
+ if (!device_state || !dev_info) {
+ continue;
+ }
+ kprintf("\t\t capacity: %d KiB\n",
+ (dev_info->max_lba * dev_info->block_size) >> 10);
+ kprintf("\t\t block size: %dB\n", dev_info->block_size);
+ kprintf("\t\t model: %s\n", &dev_info->model);
+ kprintf("\t\t serial: %s\n", &dev_info->serial_num);
+ }
+}
+
+int
+__get_free_slot(struct hba_port* port)
+{
+ hba_reg_t pxsact = port->regs[HBA_RPxSACT];
+ hba_reg_t pxci = port->regs[HBA_RPxCI];
+ hba_reg_t free_bmp = pxsact | pxci;
+ uint32_t i = 0;
+ for (; i <= hba.cmd_slots && (free_bmp & 0x1); i++, free_bmp >>= 1)
+ ;
+ return i | -(i > hba.cmd_slots);
+}
+
+void
+sata_create_fis(struct sata_reg_fis* cmd_fis,
+ uint8_t command,
+ uint64_t lba,
+ uint16_t sector_count)
+{
+ cmd_fis->head.type = SATA_REG_FIS_H2D;
+ cmd_fis->head.options = SATA_REG_FIS_COMMAND;
+ cmd_fis->head.status_cmd = command;
+ cmd_fis->dev = 0;
+
+ cmd_fis->lba0 = SATA_LBA_COMPONENT(lba, 0);
+ cmd_fis->lba8 = SATA_LBA_COMPONENT(lba, 8);
+ cmd_fis->lba16 = SATA_LBA_COMPONENT(lba, 16);
+ cmd_fis->lba24 = SATA_LBA_COMPONENT(lba, 24);
+
+ cmd_fis->lba32 = SATA_LBA_COMPONENT(lba, 32);
+ cmd_fis->lba40 = SATA_LBA_COMPONENT(lba, 40);
+
+ cmd_fis->count = sector_count;
+}
+
+int
+hba_alloc_slot(struct hba_port* port,
+ struct hba_cmdt** cmdt,
+ struct hba_cmdh** cmdh,
+ uint16_t header_options)
+{
+ int slot = __get_free_slot(port);
+ assert_msg(slot >= 0, "HBA: No free slot");
+
+ // 构建命令头（Command Header）和命令表（Command Table）
+ struct hba_cmdh* cmd_header = &port->cmdlst[slot];
+ struct hba_cmdt* cmd_table = valloc_dma(sizeof(struct hba_cmdt));
+
+ memset(cmd_header, 0, sizeof(*cmd_header));
+ memset(cmd_table, 0, sizeof(*cmd_table));
+
+ // 将命令表挂到命令头上
+ cmd_header->cmd_table_base = vmm_v2p(cmd_table);
+ cmd_header->options = HBA_CMDH_FIS_LEN(sizeof(struct sata_reg_fis)) |
+ HBA_CMDH_CLR_BUSY | (header_options & ~0x1f);
+
+ *cmdh = cmd_header;
+ *cmdt = cmd_table;
+
+ return slot;
+}
+
+int
+ahci_init_device(struct hba_port* port)
+{
+ /* 发送ATA命令，参考：SATA AHCI Spec Rev.1.3.1, section 5.5 */
+ struct hba_cmdt* cmd_table;
+ struct hba_cmdh* cmd_header;
+
+ // 确保端口是空闲的
+ wait_until(!(port->regs[HBA_RPxTFD] & (HBA_PxTFD_BSY)));
+
+ int slot = hba_alloc_slot(port, &cmd_table, &cmd_header, 0);
+
+ // 清空任何待响应的中断
+ port->regs[HBA_RPxIS] = 0;
+ port->device = vcalloc(sizeof(struct hba_device));
+
+ // 预备DMA接收缓存，用于存放HBA传回的数据
+ uint16_t* data_in = (uint16_t*)valloc_dma(512);
+
+ cmd_table->entries[0] =
+ (struct hba_prdte){ .data_base = vmm_v2p(data_in),
+ .byte_count = 511 }; // byte_count是从0开始算的
+ cmd_header->prdt_len = 1;
+
+ // 在命令表中构建命令FIS
+ struct sata_reg_fis* cmd_fis = (struct sata_reg_fis*)cmd_table->command_fis;
+
+ // 根据设备类型使用合适的命令
+ if (port->regs[HBA_RPxSIG] == HBA_DEV_SIG_ATA) {
+ // ATA 一般为硬盘
+ sata_create_fis(cmd_fis, ATA_IDENTIFY_DEVICE, 0, 0);
+ } else {
+ // ATAPI 一般为光驱，软驱，或者磁带机
+ port->device->flags |= HBA_DEV_FATAPI;
+ sata_create_fis(cmd_fis, ATA_IDENTIFY_PAKCET_DEVICE, 0, 0);
+ }
+
+ // PxCI寄存器置位，告诉HBA这儿有个数据需要发送到SATA端口
+ port->regs[HBA_RPxCI] = (1 << slot);
+
+ wait_until(!(port->regs[HBA_RPxCI] & (1 << slot)));
+
+ if ((port->regs[HBA_RPxTFD] & HBA_PxTFD_ERR)) {
+ // 有错误
+ sata_read_error(port);
+ goto fail;
+ }
+
+ /*
+ 等待数据到达内存
+ 解析IDENTIFY DEVICE传回来的数据。
+ 参考：
+ * ATA/ATAPI Command Set - 3 (ACS-3), Section 7.12.7
+ */
+ ahci_parse_dev_info(port->device, data_in);
+
+ if (!(port->device->flags & HBA_DEV_FATAPI)) {
+ goto done;
+ }
+
+ /*
+ 注意：ATAPI设备是无法通过IDENTIFY PACKET DEVICE 获取容量信息的。
+ 我们需要使用SCSI命令的READ_CAPACITY(16)进行获取。
+ 步骤如下：
+ 1. 因为ATAPI走的是SCSI，而AHCI对此专门进行了SATA的封装，
+ 也就是通过SATA的PACKET命令对SCSI命令进行封装。所以我们
+ 首先需要构建一个PACKET命令的FIS
+ 2. 接着，在ACMD中构建命令READ_CAPACITY的CDB - 一种SCSI命令的封装
+ 3. 然后把cmd_header->options的A位置位，表示这是一个送往ATAPI的命令。
+ 一点细节：
+ 1. HBA往底层SATA控制器发送PACKET FIS
+ 2. SATA控制器回复PIO Setup FIS
+ 3. HBA读入ACMD中的CDB，打包成Data FIS进行答复
+ 4. SATA控制器解包，拿到CDB，通过SCSI协议转发往ATAPI设备。
+ 5. ATAPI设备回复Return Parameter，SATA通过DMA Setup FIS
+ 发起DMA请求，HBA介入，将Return Parameter写入我们在PRDT
+ 里设置的data_in位置。
+ 4. 最后照常等待HBA把结果写入data_in，然后直接解析就好了。
+ 参考：
+ * ATA/ATAPI Command Set - 3 (ACS-3), Section 7.18
+ * SATA AHCI HBA Spec, Section 5.3.7
+ * SCSI Command Reference Manual, Section 3.26
+ */
+ struct scsi_cdb16* cdb16 = (struct scsi_cdb16*)cmd_table->atapi_cmd;
+
+ sata_create_fis(cmd_fis, ATA_PACKET, 512 << 8, 0);
+ scsi_create_packet16(cdb16, SCSI_READ_CAPACITY_16, 0, 512);
+
+ cdb16->misc1 = 0x10; // service action
+ cmd_header->transferred_size = 0;
+ cmd_header->options |= HBA_CMDH_ATAPI;
+
+ port->regs[HBA_RPxCI] = (1 << slot);
+ wait_until(!(port->regs[HBA_RPxCI] & (1 << slot)));
+
+ if ((port->regs[HBA_RPxTFD] & HBA_PxTFD_ERR)) {
+ // 有错误
+ sata_read_error(port);
+ goto fail;
+ }
+
+ scsi_parse_capacity(port->device, (uint32_t*)data_in);
+
+done:
+ achi_register_ops(port);
+
+ vfree_dma(data_in);
+ vfree_dma(cmd_table);
+
+ return 1;
+
+fail:
+ vfree_dma(data_in);
+ vfree_dma(cmd_table);
+
+ return 0;
+}
+
+int
+ahci_identify_device(struct hba_port* port)
+{
+ // 用于重新识别设备（比如在热插拔的情况下）
+ vfree(port->device);
+ return ahci_init_device(port);
+}
+
+void
+achi_register_ops(struct hba_port* port)
+{
+ port->device->ops.identify = ahci_identify_device;
+ if (!(port->device->flags & HBA_DEV_FATAPI)) {
+ port->device->ops.read_buffer = sata_read_buffer;
+ port->device->ops.write_buffer = sata_write_buffer;
+ } else {
+ port->device->ops.read_buffer = scsi_read_buffer;
+ port->device->ops.write_buffer = scsi_write_buffer;
git://scm.lunaixsky.com / lunaix-os.git / blobdiff