Support to multi-threading and pthread interface (POSIX.1-2008) (#23)

[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..0f1ebf33810fcd1ce9fcadb9a667b497c3458a14 100644 (file)
--- a/lunaix-os/hal/ahci/ahci.c
+++ b/lunaix-os/hal/ahci/ahci.c
@@ -9,9 +9,17 @@
  *
  */
 #include <hal/ahci/ahci.h>
  *
  */
 #include <hal/ahci/ahci.h>

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

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

+
+#include <sys/pci_hba.h>
+#include <sys/port_io.h>
+

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

+#include <lunaix/block.h>
+#include <lunaix/isrm.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>


@@ -22,218 +30,287 @@
 #define HBA_FIS_SIZE 256
 #define HBA_CLB_SIZE 1024
 
 #define HBA_FIS_SIZE 256
 #define HBA_CLB_SIZE 1024
 

+#define HBA_MY_IE (HBA_PxINTR_DHR | HBA_PxINTR_TFE | HBA_PxINTR_OF)
+#define AHCI_DEVCLASS DEVCLASS(DEVIF_PCI, DEVFN_STORAGE, DEV_SATA)
+
+// #define DO_HBA_FULL_RESET
+

 LOG_MODULE("AHCI")
 
 LOG_MODULE("AHCI")
 

-static struct ahci_hba hba;
+DEFINE_LLIST(ahcis);

 
 

-void
-__ahci_hba_isr(isr_param param);
+static char sata_ifs[][20] = { "Not detected",
+                               "SATA I (1.5Gbps)",
+                               "SATA II (3.0Gbps)",
+                               "SATA III (6.0Gbps)" };

 
 

-void
-ahci_init()
-{
-    struct pci_device* ahci_dev = pci_get_device_by_class(AHCI_HBA_CLASS);
-    assert_msg(ahci_dev, "AHCI: Not found.");
+static struct devclass ahci_class = AHCI_DEVCLASS;
+
+extern void
+ahci_fsexport(struct block_dev* bdev, void* fs_node);
+
+extern void
+__ahci_blkio_handler(struct blkio_req* req);

 
 

-    uintptr_t bar6, size;
-    size = pci_bar_sizing(ahci_dev, &bar6, 6);
-    assert_msg(bar6 && PCI_BAR_MMIO(bar6), "AHCI: BAR#6 is not MMIO.");
+int
+ahci_init_device(struct hba_port* port);
+
+void
+achi_register_ops(struct hba_port* port);

 
 

-    pci_reg_t cmd = pci_read_cspace(ahci_dev->cspace_base, PCI_REG_STATUS_CMD);
+void
+ahci_register_device(struct hba_device* hbadev);

 
 

-    // 禁用传统中断（因为我们使用MSI），启用MMIO访问，允许PCI设备间访问
-    cmd |= (PCI_RCMD_MM_ACCESS | PCI_RCMD_DISABLE_INTR | PCI_RCMD_BUS_MASTER);
+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;
+    port_delay(100000); // 等待至少一毫秒，差不多就行了
+    port_reg[HBA_RPxSCTL] &= ~0xf;
+}

 
 

-    pci_write_cspace(ahci_dev->cspace_base, PCI_REG_STATUS_CMD, cmd);
+struct ahci_driver*
+ahci_driver_init(struct ahci_driver_param* param)
+{
+    struct ahci_driver* ahci_drv = vzalloc(sizeof(*ahci_drv));
+    struct ahci_hba* hba = &ahci_drv->hba;
+    ahci_drv->id = param->ahci_iv;

 
 

-    pci_setup_msi(ahci_dev, AHCI_HBA_IV);
-    intr_subscribe(AHCI_HBA_IV, __ahci_hba_isr);
+    isrm_set_payload(param->ahci_iv, (ptr_t)&ahcis);

 
 

-    memset(&hba, 0, sizeof(hba));
+    llist_append(&ahcis, &ahci_drv->ahci_drvs);

 
 

-    hba.base = (hba_reg_t*)ioremap(PCI_BAR_ADDR_MM(bar6), size);
+    hba->base = (hba_reg_t*)ioremap(param->mmio_base, param->mmio_size);

 
 

+#ifdef DO_HBA_FULL_RESET

     // 重置HBA
     // 重置HBA

-    hba.base[HBA_RGHC] |= HBA_RGHC_RESET;
-    wait_until(!(hba.base[HBA_RGHC] & HBA_RGHC_RESET));
+    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
 
     // 启用AHCI工作模式，启用中断

-    hba.base[HBA_RGHC] |= HBA_RGHC_ACHI_ENABLE;
-    hba.base[HBA_RGHC] |= HBA_RGHC_INTR_ENABLE;
+    hba->base[HBA_RGHC] |= HBA_RGHC_ACHI_ENABLE;
+    hba->base[HBA_RGHC] |= HBA_RGHC_INTR_ENABLE;

 
     // As per section 3.1.1, this is 0 based value.
 
     // As per section 3.1.1, this is 0 based value.

-    hba_reg_t cap = hba.base[HBA_RCAP];
-    hba.ports_num = (cap & 0x1f) + 1;  // CAP.PI
-    hba.cmd_slots = (cap >> 8) & 0x1f; // CAP.NCS
-    hba.version = hba.base[HBA_RVER];
+    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_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;
+    ptr_t clb_pg_addr = 0, fis_pg_addr = 0;
+    ptr_t clb_pa = 0, fis_pa = 0;
+

     for (size_t i = 0, fisp = 0, clbp = 0; i < 32;
          i++, pmap >>= 1, fisp = (fisp + 1) % 16, clbp = (clbp + 1) % 4) {
         if (!(pmap & 0x1)) {
             continue;
         }
 
     for (size_t i = 0, fisp = 0, clbp = 0; i < 32;
          i++, pmap >>= 1, fisp = (fisp + 1) % 16, clbp = (clbp + 1) % 4) {
         if (!(pmap & 0x1)) {
             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* port_regs =

-          (hba_reg_t*)(&hba.base[HBA_RPBASE + i * HBA_RPSIZE]);
+          (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
 
         if (!clbp) {
             // 每页最多4个命令队列

-            clb_pa = pmm_alloc_page(KERNEL_PID, PP_FGLOCKED);
-            clb_pg_addr = ioremap(clb_pa, 0x1000);
-            memset(clb_pg_addr, 0, 0x1000);
+            clb_pa = pmm_alloc_page(PP_FGLOCKED);
+            clb_pg_addr = (ptr_t)ioremap(clb_pa, 0x1000);
+            memset((void*)clb_pg_addr, 0, 0x1000);

         }
         if (!fisp) {
             // 每页最多16个FIS
         }
         if (!fisp) {
             // 每页最多16个FIS

-            fis_pa = pmm_alloc_page(KERNEL_PID, PP_FGLOCKED);
-            fis_pg_addr = ioremap(fis_pa, 0x1000);
-            memset(fis_pg_addr, 0, 0x1000);
+            fis_pa = pmm_alloc_page(PP_FGLOCKED);
+            fis_pg_addr = (ptr_t)ioremap(fis_pa, 0x1000);
+            memset((void*)fis_pg_addr, 0, 0x1000);

         }
 
         /* 重定向CLB与FIS */
         port_regs[HBA_RPxCLB] = clb_pa + clbp * HBA_CLB_SIZE;
         port_regs[HBA_RPxFB] = fis_pa + fisp * HBA_FIS_SIZE;
 
         }
 
         /* 重定向CLB与FIS */
         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 = (struct hba_cmdh*)(clb_pg_addr + clbp * HBA_CLB_SIZE),
+            .fis = (void*)(fis_pg_addr + fisp * HBA_FIS_SIZE),
+            .hba = hba
+        };

 
         /* 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;
 

-        // 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;
+        hba_clear_reg(port_regs[HBA_RPxSERR]);

 
 

-        port_regs[HBA_RPxIE] |= (HBA_PxINTR_DMA);
-        port_regs[HBA_RPxIE] |= (HBA_PxINTR_D2HR);
+        hba->ports[i] = port;
+
+        if (!HBA_RPxSSTS_IF(port->ssts)) {
+            continue;
+        }

 
 

-        hba.ports[i] = port;
+        wait_until(!(port_regs[HBA_RPxCMD] & HBA_PxCMD_CR));
+        port_regs[HBA_RPxCMD] |= HBA_PxCMD_FRE;
+        port_regs[HBA_RPxCMD] |= HBA_PxCMD_ST;

 
 

-        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 (!ahci_init_device(port)) {
+            ERROR("init fail: 0x%x@p%d", port->regs[HBA_RPxSIG], i);
+            continue;

         }
         }

-    }
-}

 
 

-char sata_ifs[][20] = { "Not detected",
-                        "SATA I (1.5Gbps)",
-                        "SATA II (3.0Gbps)",
-                        "SATA III (6.0Gbps)" };
+        struct hba_device* hbadev = port->device;
+        kprintf(KINFO "sata%d: %s, blk_size=%d, blk=0..%d",
+                i,
+                hbadev->model,
+                hbadev->block_size,
+                (u32_t)hbadev->max_lba);

 
 

-void
-__ahci_hba_isr(isr_param param)
-{
-    // TODO: hba interrupt
-    kprintf(KDEBUG "HBA INTR\n");
+        ahci_register_device(hbadev);
+    }
+
+    return ahci_drv;

 }
 
 void
 }
 
 void

-ahci_list_device()
+ahci_register_device(struct hba_device* hbadev)

 {
 {

-    kprintf(KINFO "Version: %x; Ports: %d; Slot: %d\n",
-            hba.version,
-            hba.ports_num,
-            hba.cmd_slots);
-    struct ahci_port* port;
-    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
-        //  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) {
-            continue;
-        }
-
-        int device_state = HBA_RPxSSTS_IF(port->ssts);
+    struct block_dev* bdev =
+      block_alloc_dev(hbadev->model, hbadev, __ahci_blkio_handler);

 
 

-        kprintf("\t Port %d: %s (%x)\n",
-                i,
-                &sata_ifs[device_state],
-                port->regs[HBA_RPxSIG]);
+    bdev->end_lba = hbadev->max_lba;
+    bdev->blk_size = hbadev->block_size;
+    bdev->class = &ahci_class;

 
 

-        struct ahci_device_info* dev_info = port->device_info;
-        if (!device_state || !dev_info) {
-            continue;
-        }
-
-        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);
-        kprintf("\t\t model: %s\n", &dev_info->model);
-        kprintf("\t\t serial: %s\n", &dev_info->serial_num);
-    }
+    block_mount(bdev, ahci_fsexport);

 }
 
 int
 }
 
 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 free_bmp = pxsact | pxci;
 {
     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)
+    u32_t i = 0;
+    for (; i <= port->hba->cmd_slots && (free_bmp & 0x1); i++, free_bmp >>= 1)

         ;
         ;

-    return i | -(i > hba.cmd_slots);
+    return i | -(i > port->hba->cmd_slots);

 }
 
 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,
+                u8_t command,
+                lba_t lba,
+                u16_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_bind_sbuf(struct hba_cmdh* cmdh, struct hba_cmdt* cmdt, struct membuf mbuf)

 {
 {

-    int slot = achi_alloc_slot(port);
-    assert_msg(slot >= 0, "No free slot");
+    assert_msg(mbuf.size <= 0x400000U, "HBA: Buffer too big");
+    cmdh->prdt_len = 1;
+    cmdt->entries[0] =
+      (struct hba_prdte){ .data_base = vmm_v2p((ptr_t)mbuf.buffer),
+                          .byte_count = mbuf.size - 1 };

 
 

-    // 清空任何待响应的中断
-    port->regs[HBA_RPxIS] = 0;
+    return 0;
+}

 
 

-    /* 发送ATA命令，参考：SATA AHCI Spec Rev.1.3.1, section 5.5 */
+int
+hba_bind_vbuf(struct hba_cmdh* cmdh, struct hba_cmdt* cmdt, struct vecbuf* vbuf)
+{
+    size_t i = 0;
+    struct vecbuf* pos = vbuf;
+
+    do {
+        assert_msg(i < HBA_MAX_PRDTE, "HBA: Too many PRDTEs");
+        assert_msg(pos->buf.size <= 0x400000U, "HBA: Buffer too big");
+
+        cmdt->entries[i++] =
+          (struct hba_prdte){ .data_base = vmm_v2p((ptr_t)pos->buf.buffer),
+                              .byte_count = pos->buf.size - 1 };
+        pos = list_entry(pos->components.next, struct vecbuf, components);
+    } while (pos != vbuf);
+
+    cmdh->prdt_len = i + 1;
+
+    return 0;
+}
+
+int
+hba_prepare_cmd(struct hba_port* port,
+                struct hba_cmdt** cmdt,
+                struct hba_cmdh** cmdh)
+{
+    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）
 
     // 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));
+    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));
 
     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((ptr_t)cmd_table);
+    cmd_header->options =
+      HBA_CMDH_FIS_LEN(sizeof(struct sata_reg_fis)) | HBA_CMDH_CLR_BUSY;
+
+    *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;
+
+    // mask DHR interrupt
+    port->regs[HBA_RPxIE] &= ~HBA_MY_IE;

 
     // 预备DMA接收缓存，用于存放HBA传回的数据
 
     // 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);
+    u16_t* data_in = (u16_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);
+    hba_bind_sbuf(
+      cmd_header, cmd_table, (struct membuf){ .buffer = data_in, .size = 512 });
+
+    port->device = vzalloc(sizeof(struct hba_device));
+    port->device->port = port;
+    port->device->hba = port->hba;

 
     // 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 +318,108 @@ 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)));
+    if (!ahci_try_send(port, slot)) {
+        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);
+
+    if (!(port->device->flags & HBA_DEV_FATAPI)) {
+        goto done;
+    }

 
 

-        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。
+    /*
+        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);
+
+    sata_create_fis(cmd_fis, ATA_PACKET, 512 << 8, 0);
+
+    // for dev use 12 bytes cdb, READ_CAPACITY must use the 10 bytes variation.
+    if (port->device->cbd_size == SCSI_CDB12) {
+        struct scsi_cdb12* cdb12 = (struct scsi_cdb12*)cmd_table->atapi_cmd;
+        // ugly tricks to construct 10 byte cdb from 12 byte cdb
+        scsi_create_packet12(cdb12, SCSI_READ_CAPACITY_10, 0, 512 << 8);
+    } else {
+        struct scsi_cdb16* cdb16 = (struct scsi_cdb16*)cmd_table->atapi_cmd;
+        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;
+
+    if (!ahci_try_send(port, slot)) {
+        goto fail;
+    }
+
+    scsi_parse_capacity(port->device, (u32_t*)data_in);
+
+done:
+    // reset interrupt status and unmask D2HR interrupt
+    port->regs[HBA_RPxIE] |= HBA_MY_IE;
+    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_RPxIE] |= HBA_MY_IE;
+    vfree_dma(data_in);
+    vfree_dma(cmd_table);
+
+    return 0;
+}
+
+int
+ahci_identify_device(struct hba_device* device)
+{
+    // 用于重新识别设备（比如在热插拔的情况下）
+    vfree(device);
+    return ahci_init_device(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.submit = sata_submit;
+    } else {
+        port->device->ops.submit = scsi_submit;
+    }
+}