* @copyright Copyright (c) 2022
*
*/
-#include <hal/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/pci.h>
#include <klibc/string.h>
-#include <lunaix/mm/kalloc.h>
#include <lunaix/mm/mmio.h>
#include <lunaix/mm/pmm.h>
+#include <lunaix/mm/valloc.h>
+#include <lunaix/mm/vmm.h>
#include <lunaix/spike.h>
#include <lunaix/syslog.h>
static struct ahci_hba hba;
+void
+__ahci_hba_isr(isr_param param);
+
+int
+ahci_init_device(struct hba_port* port);
+
void
ahci_init()
{
pci_write_cspace(ahci_dev->cspace_base, PCI_REG_STATUS_CMD, cmd);
+ pci_setup_msi(ahci_dev, AHCI_HBA_IV);
+ intr_subscribe(AHCI_HBA_IV, __ahci_hba_isr);
+
+ memset(&hba, 0, sizeof(hba));
+
hba.base = (hba_reg_t*)ioremap(PCI_BAR_ADDR_MM(bar6), size);
// 重置HBA
wait_until(!(hba.base[HBA_RGHC] & HBA_RGHC_RESET));
// 启用AHCI工作模式，启用中断
- hba.base[HBA_RGHC] |= (HBA_RGHC_ACHI_ENABLE | 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.
hba_reg_t cap = hba.base[HBA_RCAP];
continue;
}
- struct ahci_port* port =
- (struct ahci_port*)lxmalloc(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]);
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],
- .cmdlstv = clb_pg_addr + clbp * HBA_CLB_SIZE,
- .fisv = 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;
- port_regs[HBA_RPxIE] |= (HBA_PxINTR_DMA | HBA_PxINTR_D2HR);
- port_regs[HBA_RPxCMD] |= (HBA_PxCMD_FRE | HBA_PxCMD_ST);
+
+ // 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;
+
+ 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_init_device(port)) {
+ kprintf(KERROR "fail to init device");
+ }
+ }
}
}
"SATA II (3.0Gbps)",
"SATA III (6.0Gbps)" };
+void
+__ahci_hba_isr(isr_param param)
+{
+ // TODO: hba interrupt
+ kprintf(KDEBUG "HBA INTR\n");
+}
+
void
ahci_list_device()
{
- kprintf(KINFO "Version: %x; Ports: %d\n", hba.version, hba.ports_num);
+ kprintf(KINFO "Version: %x; Ports: %d; Slot: %d\n",
+ hba.version,
+ hba.ports_num,
+ hba.cmd_slots);
+ struct hba_port* port;
for (size_t i = 0; i < 32; i++) {
- struct ahci_port* port = hba.ports[i];
- if (!port)
+ port = hba.ports[i];
+
+ // 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) {
continue;
- kprintf("\t Port %d: %s\n", i, &sata_ifs[HBA_RPxSSTS_IF(port->ssts)]);
+ }
+
+ 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 sector 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,
+ uint32_t lba_lo,
+ uint32_t lba_hi,
+ 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_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->lba32 = SATA_LBA_COMPONENT(lba_hi, 0);
+ cmd_fis->lba40 = SATA_LBA_COMPONENT(lba_hi, 8);
+
+ 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->prdt_len = 1;
+ 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;
+
+ 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 = valloc(sizeof(struct hba_device));
+ port->device->signature = port->regs[HBA_RPxSIG];
+
+ // 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->device->signature == HBA_DEV_SIG_ATA) {
+ // ATA 一般为硬盘
+ sata_create_fis(cmd_fis, ATA_IDENTIFY_DEVICE, 0, 0, 0);
+ } else {
+ // ATAPI 一般为光驱，软驱，或者磁带机
+ sata_create_fis(cmd_fis, ATA_IDENTIFY_PAKCET_DEVICE, 0, 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)));
+
+ /*
+ 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->signature == HBA_DEV_SIG_ATA) {
+ goto done;
}
-}
\ No newline at end of file
+
+ /*
+ 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
+ */
+ sata_create_fis(cmd_fis, ATA_PACKET, 512 << 8, 0, 0);
+ struct scsi_cdb16* cdb16 = (struct scsi_cdb16*)cmd_table->atapi_cmd;
+ scsi_create_packet16(cdb16, SCSI_READ_CAPACITY_16, 0, 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)));
+
+ scsi_parse_capacity(port->device, (uint32_t*)data_in);
+
+done:
+ vfree_dma(data_in);
+ vfree_dma(cmd_table);
+
+ return 1;
+}
+
+// TODO: Support ATAPI Device.
\ No newline at end of file
git://scm.lunaixsky.com / lunaix-os.git / blobdiff