lunaix-os/hal/ahci/atapi.c

   1 #include <hal/ahci/hba.h>
   2 #include <hal/ahci/sata.h>
   3 #include <hal/ahci/scsi.h>
   4 #include <hal/ahci/utils.h>
   5
   6 #include <klibc/string.h>
   7 #include <lunaix/mm/valloc.h>
   8 #include <lunaix/mm/vmm.h>
   9 #include <lunaix/spike.h>
  10 #include <lunaix/syslog.h>
  11
  12 void
  13 scsi_create_packet12(struct scsi_cdb12* cdb,
  14                      uint8_t opcode,
  15                      uint32_t lba,
  16                      uint32_t alloc_size)
  17 {
  18     memset(cdb, 0, sizeof(*cdb));
  19     cdb->opcode = opcode;
  20     cdb->lba_be = SCSI_FLIP(lba);
  21     cdb->length = SCSI_FLIP(alloc_size);
  22 }
  23
  24 void
  25 scsi_create_packet16(struct scsi_cdb16* cdb,
  26                      uint8_t opcode,
  27                      uint64_t lba,
  28                      uint32_t alloc_size)
  29 {
  30     memset(cdb, 0, sizeof(*cdb));
  31     cdb->opcode = opcode;
  32     cdb->lba_be_hi = SCSI_FLIP((uint32_t)(lba >> 32));
  33     cdb->lba_be_lo = SCSI_FLIP((uint32_t)lba);
  34     cdb->length = SCSI_FLIP(alloc_size);
  35 }
  36
  37 void
  38 scsi_parse_capacity(struct hba_device* device, uint32_t* parameter)
  39 {
  40     if (device->cbd_size == SCSI_CDB16) {
  41         device->max_lba =
  42           SCSI_FLIP(*(parameter + 1)) | (SCSI_FLIP(*parameter) << 32);
  43         device->block_size = SCSI_FLIP(*(parameter + 2));
  44     } else {
  45         // for READ_CAPACITY(10)
  46         device->max_lba = SCSI_FLIP(*(parameter));
  47         device->block_size = SCSI_FLIP(*(parameter + 1));
  48     }
  49 }
  50
  51 int
  52 __scsi_buffer_io(struct hba_device* dev,
  53                  uint64_t lba,
  54                  void* buffer,
  55                  uint32_t size,
  56                  int write)
  57 {
  58     assert_msg(((uintptr_t)buffer & 0x3) == 0, "HBA: Bad buffer alignment");
  59
  60     struct hba_port* port = dev->port;
  61     struct hba_cmdh* header;
  62     struct hba_cmdt* table;
  63     int slot = hba_prepare_cmd(port, &table, &header, buffer, size);
  64     int bitmask = 1 << slot;
  65
  66     // 确保端口是空闲的
  67     wait_until(!(port->regs[HBA_RPxTFD] & (HBA_PxTFD_BSY | HBA_PxTFD_DRQ)));
  68
  69     port->regs[HBA_RPxIS] = 0;
  70
  71     header->options |= (HBA_CMDH_WRITE * (write == 1)) | HBA_CMDH_ATAPI;
  72
  73     uint32_t count = ICEIL(size, port->device->block_size);
  74
  75     struct sata_reg_fis* fis = (struct sata_reg_fis*)table->command_fis;
  76     void* cdb = table->atapi_cmd;
  77     sata_create_fis(fis, ATA_PACKET, (size << 8), 0);
  78     fis->feature = 1 | ((!write) << 2);
  79
  80     if (port->device->cbd_size == 16) {
  81         scsi_create_packet16((struct scsi_cdb16*)cdb,
  82                              write ? SCSI_WRITE_BLOCKS_16 : SCSI_READ_BLOCKS_16,
  83                              lba,
  84                              count);
  85     } else {
  86         scsi_create_packet12((struct scsi_cdb12*)cdb,
  87                              write ? SCSI_WRITE_BLOCKS_12 : SCSI_READ_BLOCKS_12,
  88                              lba,
  89                              count);
  90     }
  91
  92     // field: cdb->misc1
  93     *((uint8_t*)cdb + 1) = 3 << 5; // RPROTECT=011b 禁用保护检查
  94
  95     int retries = 0;
  96
  97     while (retries < MAX_RETRY) {
  98         port->regs[HBA_RPxCI] = bitmask;
  99
 100         wait_until_expire(!(port->regs[HBA_RPxCI] & bitmask), 1000000);
 101
 102         if ((port->regs[HBA_RPxTFD] & HBA_PxTFD_ERR)) {
 103             // 有错误
 104             sata_read_error(port);
 105             retries++;
 106         } else {
 107             vfree_dma(table);
 108             return 1;
 109         }
 110     }
 111
 112 fail:
 113     vfree_dma(table);
 114     return 0;
 115 }
 116
 117 int
 118 scsi_read_buffer(struct hba_device* dev,
 119                  uint64_t lba,
 120                  void* buffer,
 121                  uint32_t size)
 122 {
 123     return __scsi_buffer_io(dev, lba, buffer, size, 0);
 124 }
 125
 126 int
 127 scsi_write_buffer(struct hba_device* dev,
 128                   uint64_t lba,
 129                   void* buffer,
 130                   uint32_t size)
 131 {
 132     return __scsi_buffer_io(dev, lba, buffer, size, 1);
 133 }