Merge branch 'master' into vfs-dev

[lunaix-os.git] / lunaix-os / hal / ahci / ahci.c

diff --git a/lunaix-os/hal/ahci/ahci.c b/lunaix-os/hal/ahci/ahci.c
index 57bedb6b1f93616589841684a3957e76f04a031c..0551ee547fe9283bf4c063895bc61db89806d4fd 100644 (file)
--- a/lunaix-os/hal/ahci/ahci.c
+++ b/lunaix-os/hal/ahci/ahci.c
@@ -9,9 +9,14 @@
  *
  */
 #include <hal/ahci/ahci.h>
  *
  */
 #include <hal/ahci/ahci.h>

+#include <hal/ahci/hba.h>
+#include <hal/ahci/sata.h>
+#include <hal/ahci/scsi.h>

 #include <hal/ahci/utils.h>
 #include <hal/ahci/utils.h>

+

 #include <hal/pci.h>
 #include <klibc/string.h>
 #include <hal/pci.h>
 #include <klibc/string.h>

+#include <lunaix/block.h>

 #include <lunaix/mm/mmio.h>
 #include <lunaix/mm/pmm.h>
 #include <lunaix/mm/valloc.h>
 #include <lunaix/mm/mmio.h>
 #include <lunaix/mm/pmm.h>
 #include <lunaix/mm/valloc.h>


@@ -22,6 +27,8 @@
 #define HBA_FIS_SIZE 256
 #define HBA_CLB_SIZE 1024
 
 #define HBA_FIS_SIZE 256
 #define HBA_CLB_SIZE 1024
 

+// #define DO_HBA_FULL_RESET
+

 LOG_MODULE("AHCI")
 
 static struct ahci_hba hba;
 LOG_MODULE("AHCI")
 
 static struct ahci_hba hba;


@@ -29,6 +36,43 @@ static struct ahci_hba hba;
 void
 __ahci_hba_isr(isr_param param);
 
 void
 __ahci_hba_isr(isr_param param);
 

+int
+ahci_init_device(struct hba_port* port);
+
+void
+achi_register_ops(struct hba_port* port);
+
+unsigned int
+ahci_get_port_usage()
+{
+    return hba.ports_bmp;
+}
+
+struct hba_port*
+ahci_get_port(unsigned int index)
+{
+    if (index >= 32) {
+        return 0;
+    }
+    return hba.ports[index];
+}
+
+void
+__hba_reset_port(hba_reg_t* port_reg)
+{
+    // 根据：SATA-AHCI spec section 10.4.2 描述的端口重置流程
+    port_reg[HBA_RPxCMD] &= ~HBA_PxCMD_ST;
+    port_reg[HBA_RPxCMD] &= ~HBA_PxCMD_FRE;
+    int cnt = wait_until_expire(!(port_reg[HBA_RPxCMD] & HBA_PxCMD_CR), 500000);
+    if (cnt) {
+        return;
+    }
+    // 如果port未响应，则继续执行重置
+    port_reg[HBA_RPxSCTL] = (port_reg[HBA_RPxSCTL] & ~0xf) | 1;
+    io_delay(100000); //等待至少一毫秒，差不多就行了
+    port_reg[HBA_RPxSCTL] &= ~0xf;
+}
+

 void
 ahci_init()
 {
 void
 ahci_init()
 {


@@ -53,9 +97,11 @@ ahci_init()
 
     hba.base = (hba_reg_t*)ioremap(PCI_BAR_ADDR_MM(bar6), size);
 
 
     hba.base = (hba_reg_t*)ioremap(PCI_BAR_ADDR_MM(bar6), size);
 

+#ifdef DO_HBA_FULL_RESET

     // 重置HBA
     hba.base[HBA_RGHC] |= HBA_RGHC_RESET;
     wait_until(!(hba.base[HBA_RGHC] & HBA_RGHC_RESET));
     // 重置HBA
     hba.base[HBA_RGHC] |= HBA_RGHC_RESET;
     wait_until(!(hba.base[HBA_RGHC] & HBA_RGHC_RESET));

+#endif

 
     // 启用AHCI工作模式，启用中断
     hba.base[HBA_RGHC] |= HBA_RGHC_ACHI_ENABLE;
 
     // 启用AHCI工作模式，启用中断
     hba.base[HBA_RGHC] |= HBA_RGHC_ACHI_ENABLE;


@@ -63,12 +109,14 @@ ahci_init()
 
     // As per section 3.1.1, this is 0 based value.
     hba_reg_t cap = hba.base[HBA_RCAP];
 
     // As per section 3.1.1, this is 0 based value.
     hba_reg_t cap = hba.base[HBA_RCAP];

+    hba_reg_t pmap = hba.base[HBA_RPI];
+

     hba.ports_num = (cap & 0x1f) + 1;  // CAP.PI
     hba.cmd_slots = (cap >> 8) & 0x1f; // CAP.NCS
     hba.version = hba.base[HBA_RVER];
     hba.ports_num = (cap & 0x1f) + 1;  // CAP.PI
     hba.cmd_slots = (cap >> 8) & 0x1f; // CAP.NCS
     hba.version = hba.base[HBA_RVER];

+    hba.ports_bmp = pmap;

 
     /* ------ HBA端口配置 ------ */
 
     /* ------ HBA端口配置 ------ */

-    hba_reg_t pmap = hba.base[HBA_RPI];

     uintptr_t clb_pg_addr, fis_pg_addr, clb_pa, fis_pa;
     for (size_t i = 0, fisp = 0, clbp = 0; i < 32;
          i++, pmap >>= 1, fisp = (fisp + 1) % 16, clbp = (clbp + 1) % 4) {
     uintptr_t clb_pg_addr, fis_pg_addr, clb_pa, fis_pa;
     for (size_t i = 0, fisp = 0, clbp = 0; i < 32;
          i++, pmap >>= 1, fisp = (fisp + 1) % 16, clbp = (clbp + 1) % 4) {


@@ -76,11 +124,15 @@ ahci_init()
             continue;
         }
 
             continue;
         }
 

-        struct ahci_port* port =
-          (struct ahci_port*)valloc(sizeof(struct ahci_port));
+        struct hba_port* port =
+          (struct hba_port*)valloc(sizeof(struct hba_port));

         hba_reg_t* port_regs =
           (hba_reg_t*)(&hba.base[HBA_RPBASE + i * HBA_RPSIZE]);
 
         hba_reg_t* port_regs =
           (hba_reg_t*)(&hba.base[HBA_RPBASE + i * HBA_RPSIZE]);
 

+#ifndef DO_HBA_FULL_RESET
+        __hba_reset_port(port_regs);
+#endif
+

         if (!clbp) {
             // 每页最多4个命令队列
             clb_pa = pmm_alloc_page(KERNEL_PID, PP_FGLOCKED);
         if (!clbp) {
             // 每页最多4个命令队列
             clb_pa = pmm_alloc_page(KERNEL_PID, PP_FGLOCKED);


@@ -98,10 +150,10 @@ ahci_init()
         port_regs[HBA_RPxCLB] = clb_pa + clbp * HBA_CLB_SIZE;
         port_regs[HBA_RPxFB] = fis_pa + fisp * HBA_FIS_SIZE;
 
         port_regs[HBA_RPxCLB] = clb_pa + clbp * HBA_CLB_SIZE;
         port_regs[HBA_RPxFB] = fis_pa + fisp * HBA_FIS_SIZE;
 

-        *port = (struct ahci_port){ .regs = port_regs,
-                                    .ssts = port_regs[HBA_RPxSSTS],
-                                    .cmdlst = clb_pg_addr + clbp * HBA_CLB_SIZE,
-                                    .fis = fis_pg_addr + fisp * HBA_FIS_SIZE };
+        *port = (struct hba_port){ .regs = port_regs,
+                                   .ssts = port_regs[HBA_RPxSSTS],
+                                   .cmdlst = clb_pg_addr + clbp * HBA_CLB_SIZE,
+                                   .fis = fis_pg_addr + fisp * HBA_FIS_SIZE };

 
         /* 初始化端口，并置于就绪状态 */
         port_regs[HBA_RPxCI] = 0;
 
         /* 初始化端口，并置于就绪状态 */
         port_regs[HBA_RPxCI] = 0;


@@ -109,19 +161,21 @@ ahci_init()
         // 需要通过全部置位去清空这些寄存器（相当的奇怪……）
         port_regs[HBA_RPxSERR] = -1;
 
         // 需要通过全部置位去清空这些寄存器（相当的奇怪……）
         port_regs[HBA_RPxSERR] = -1;
 

-        port_regs[HBA_RPxIE] |= (HBA_PxINTR_DMA);
-        port_regs[HBA_RPxIE] |= (HBA_PxINTR_D2HR);
-

         hba.ports[i] = port;
 
         hba.ports[i] = port;
 

-        if (HBA_RPxSSTS_IF(port->ssts)) {
-            wait_until(!(port_regs[HBA_RPxCMD] & HBA_PxCMD_CR));
-            port_regs[HBA_RPxCMD] |= HBA_PxCMD_FRE;
-            port_regs[HBA_RPxCMD] |= HBA_PxCMD_ST;
-            if (!ahci_identify_device(port)) {
-                kprintf(KERROR "fail to probe device info");
-            }
+        if (!HBA_RPxSSTS_IF(port->ssts)) {
+            continue;
+        }
+
+        wait_until(!(port_regs[HBA_RPxCMD] & HBA_PxCMD_CR));
+        port_regs[HBA_RPxCMD] |= HBA_PxCMD_FRE;
+        port_regs[HBA_RPxCMD] |= HBA_PxCMD_ST;
+
+        if (!ahci_init_device(port)) {
+            kprintf(KERROR "fail to init device");

         }
         }

+
+        block_mount_disk(port->device);

     }
 }
 
     }
 }
 


@@ -133,7 +187,8 @@ char sata_ifs[][20] = { "Not detected",
 void
 __ahci_hba_isr(isr_param param)
 {
 void
 __ahci_hba_isr(isr_param param)
 {

-    // TODO: hba interrupt
+    // TODO: clear the interrupt status
+    // TODO: I/O-operation scheduler should be here

     kprintf(KDEBUG "HBA INTR\n");
 }
 
     kprintf(KDEBUG "HBA INTR\n");
 }
 


@@ -144,11 +199,11 @@ ahci_list_device()
             hba.version,
             hba.ports_num,
             hba.cmd_slots);
             hba.version,
             hba.ports_num,
             hba.cmd_slots);

-    struct ahci_port* port;
+    struct hba_port* port;

     for (size_t i = 0; i < 32; i++) {
         port = hba.ports[i];
 
     for (size_t i = 0; i < 32; i++) {
         port = hba.ports[i];
 

-        // 愚蠢的gcc似乎认为 struct ahci_port* 不可能为空
+        // 愚蠢的gcc似乎认为 struct hba_port* 不可能为空

         //  所以将这个非常关键的if给优化掉了。
         //  这里将指针强制转换为整数，欺骗gcc :)
         if ((uintptr_t)port == 0) {
         //  所以将这个非常关键的if给优化掉了。
         //  这里将指针强制转换为整数，欺骗gcc :)
         if ((uintptr_t)port == 0) {


@@ -160,23 +215,25 @@ ahci_list_device()
         kprintf("\t Port %d: %s (%x)\n",
                 i,
                 &sata_ifs[device_state],
         kprintf("\t Port %d: %s (%x)\n",
                 i,
                 &sata_ifs[device_state],

-                port->regs[HBA_RPxSIG]);
+                port->device->flags);

 
 

-        struct ahci_device_info* dev_info = port->device_info;
+        struct hba_device* dev_info = port->device;

         if (!device_state || !dev_info) {
             continue;
         }
         if (!device_state || !dev_info) {
             continue;
         }

-

         kprintf("\t\t capacity: %d KiB\n",
         kprintf("\t\t capacity: %d KiB\n",

-                (dev_info->max_lba * dev_info->sector_size) >> 10);
-        kprintf("\t\t sector size: %dB\n", dev_info->sector_size);
+                (dev_info->max_lba * dev_info->block_size) >> 10);
+        kprintf("\t\t block size: %dB\n", dev_info->block_size);
+        kprintf("\t\t block/sector: %d\n", dev_info->block_per_sec);
+        kprintf("\t\t alignment: %dB\n", dev_info->alignment_offset);
+        kprintf("\t\t capabilities: %x\n", dev_info->capabilities);

         kprintf("\t\t model: %s\n", &dev_info->model);
         kprintf("\t\t serial: %s\n", &dev_info->serial_num);
     }
 }
 
 int
         kprintf("\t\t model: %s\n", &dev_info->model);
         kprintf("\t\t serial: %s\n", &dev_info->serial_num);
     }
 }
 
 int

-achi_alloc_slot(struct ahci_port* port)
+__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 pxsact = port->regs[HBA_RPxSACT];
     hba_reg_t pxci = port->regs[HBA_RPxCI];


@@ -188,52 +245,84 @@ achi_alloc_slot(struct ahci_port* port)
 }
 
 void
 }
 
 void

-__ahci_create_fis(struct sata_reg_fis* cmd_fis,
-                  uint8_t command,
-                  uint32_t lba_lo,
-                  uint32_t lba_hi,
-                  uint16_t sector_count)
+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->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_lo, 0);
-    cmd_fis->lba8 = SATA_LBA_COMPONENT(lba_lo, 8);
-    cmd_fis->lba16 = SATA_LBA_COMPONENT(lba_lo, 16);
-    cmd_fis->lba24 = SATA_LBA_COMPONENT(lba_lo, 24);
+    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_hi, 0);
-    cmd_fis->lba40 = SATA_LBA_COMPONENT(lba_hi, 8);
+    cmd_fis->lba32 = SATA_LBA_COMPONENT(lba, 32);
+    cmd_fis->lba40 = SATA_LBA_COMPONENT(lba, 40);

 
     cmd_fis->count = sector_count;
 }
 
 int
 
     cmd_fis->count = sector_count;
 }
 
 int

-ahci_identify_device(struct ahci_port* port)
+hba_prepare_cmd(struct hba_port* port,
+                struct hba_cmdt** cmdt,
+                struct hba_cmdh** cmdh,
+                void* buffer,
+                unsigned int size)

 {
 {

-    int slot = achi_alloc_slot(port);
-    assert_msg(slot >= 0, "No free slot");
+    int slot = __get_free_slot(port);
+    assert_msg(slot >= 0, "HBA: No free slot");
+    assert_msg(size <= 0x400000, "HBA: buffer too big");

 
 

-    // 清空任何待响应的中断
-    port->regs[HBA_RPxIS] = 0;
+    // 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 = vzalloc_dma(sizeof(struct hba_cmdt));
+
+    memset(cmd_header, 0, sizeof(*cmd_header));
+
+    // 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;
+
+    if (buffer) {
+        cmd_header->prdt_len = 1;
+        cmd_table->entries[0] =
+          (struct hba_prdte){ .data_base = vmm_v2p(buffer),
+                              .byte_count = size - 1 };
+    }
+
+    *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 */
     /* 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;

 
 

-    // 构建命令头（Command Header）和命令表（Command Table）
-    struct ahci_hba_cmdh* cmd_header = &port->cmdlst[slot];
-    struct ahci_hba_cmdt* cmd_table = valloc_dma(sizeof(struct ahci_hba_cmdt));
+    // mask DHR interrupt
+    port->regs[HBA_RPxIE] &= ~HBA_PxINTR_DHR;

 
 

-    memset(cmd_header, 0, sizeof(*cmd_header));
-    memset(cmd_table, 0, sizeof(*cmd_table));
+    // 确保端口是空闲的
+    wait_until(!(port->regs[HBA_RPxTFD] & (HBA_PxTFD_BSY)));

 
     // 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);
 
 
     // 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 ahci_hba_prdte){ .data_base = vmm_v2p(data_in),
-                               .byte_count = 511 }; // byte_count是从0开始算的
+    int slot = hba_prepare_cmd(port, &cmd_table, &cmd_header, data_in, 512);
+
+    // 清空任何待响应的中断
+    port->regs[HBA_RPxIS] = 0;
+    port->device = vzalloc(sizeof(struct hba_device));
+    port->device->port = port;

 
     // 在命令表中构建命令FIS
     struct sata_reg_fis* cmd_fis = (struct sata_reg_fis*)cmd_table->command_fis;
 
     // 在命令表中构建命令FIS
     struct sata_reg_fis* cmd_fis = (struct sata_reg_fis*)cmd_table->command_fis;


@@ -241,44 +330,116 @@ ahci_identify_device(struct ahci_port* port)
     // 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
     // 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

-        __ahci_create_fis(cmd_fis, ATA_IDENTIFY_DEVICE, 0, 0, 0);
+        sata_create_fis(cmd_fis, ATA_IDENTIFY_DEVICE, 0, 0);

     } else {
         // ATAPI 一般为光驱，软驱，或者磁带机
     } else {
         // ATAPI 一般为光驱，软驱，或者磁带机

-        __ahci_create_fis(cmd_fis, ATA_IDENTIFY_PAKCET_DEVICE, 0, 0, 0);
+        port->device->flags |= HBA_DEV_FATAPI;
+        sata_create_fis(cmd_fis, ATA_IDENTIFY_PAKCET_DEVICE, 0, 0);

     }
 
     }
 

-    // 将命令表挂到命令头上
-    cmd_header->cmd_table_base = vmm_v2p(cmd_table);
-    cmd_header->prdt_len = 1;
-    cmd_header->options |=
-      HBA_CMDH_FIS_LEN(sizeof(*cmd_fis)) | HBA_CMDH_CLR_BUSY;
-

     // 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)));
 
     // 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
     /*
         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);

 
 

-        注意：ATAPI无法通过IDENTIFY PACKET DEVICE 获取容量信息。
-        这需要另外使用特殊的SCSI命令中的READ CAPACITY(16)
-        来获取，这种命令需要使用ATA的PACKET命令发出。
+    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
     */
           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
     */

-    port->device_info = valloc(sizeof(struct ahci_device_info));
-    ahci_parse_dev_info(port->device_info, data_in);
+    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:
+    // reset interrupt status and unmask D2HR interrupt
+    port->regs[HBA_RPxIS] = -1;
+    port->regs[HBA_RPxIE] |= HBA_PxINTR_DHR;
+    achi_register_ops(port);

 
     vfree_dma(data_in);
     vfree_dma(cmd_table);
 
     return 1;
 
     vfree_dma(data_in);
     vfree_dma(cmd_table);
 
     return 1;

+
+fail:
+    port->regs[HBA_RPxIS] = -1;
+    port->regs[HBA_RPxIE] |= HBA_PxINTR_DHR;
+    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);

 }
 
 }
 

-// TODO: Support ATAPI Device.
\ No newline at end of file
+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;
+    }
+}
\ No newline at end of file