atapiextpassthru.c

来自「EFI BIOS是Intel提出的下一代的BIOS标准。这里上传的Edk源代码是」· C语言代码 · 共 2,448 行 · 第 1/5 页
2,448 行
  UINT64  Delay;
  UINT8   AltStatusRegister;
  UINT8   ErrRegister;
  UINTN   Remainder;

  if (TimeoutInMicroSeconds == 0) {
    Delay = 2;
  } else {
    Delay = DivU64x32 (TimeoutInMicroSeconds, (UINT32) 30, &Remainder) + 1;
  }

  do {

    AltStatusRegister = ReadPortB (
                          AtapiScsiPrivate->PciIo,
                          AtapiScsiPrivate->IoPort->Alt.AltStatus
                          );

    //
    // wait for BSY == 0 and DRQ == 0
    //
    if ((AltStatusRegister & (DRQ | BSY)) == 0) {
      break;
    }

    if ((AltStatusRegister & (BSY | ERR)) == ERR) {

      ErrRegister = ReadPortB (
                      AtapiScsiPrivate->PciIo,
                      AtapiScsiPrivate->IoPort->Reg1.Error
                      );
      if ((ErrRegister & ABRT_ERR) == ABRT_ERR) {

        return EFI_ABORTED;
      }
    }
    //
    //  Stall for 30 us
    //
    gBS->Stall (30);

    //
    // Loop infinitely if not meeting expected condition
    //
    if (TimeoutInMicroSeconds == 0) {
      Delay = 2;
    }

    Delay--;
  } while (Delay);

  if (Delay == 0) {
    return EFI_TIMEOUT;
  }

  return EFI_SUCCESS;
}

STATIC  
EFI_STATUS
StatusDRQReady (
  ATAPI_EXT_SCSI_PASS_THRU_DEV        *AtapiScsiPrivate,
  UINT64                              TimeoutInMicroSeconds
  )
/*++

Routine Description:

  Check whether DRQ is ready in the Status Register. (BSY must also be cleared)
  If TimeoutInMicroSeconds is zero, this routine should wait infinitely for
  DRQ ready. Otherwise, it will return EFI_TIMEOUT when specified time is 
  elapsed.

Arguments:

  AtapiScsiPrivate            - The pointer of ATAPI_SCSI_PASS_THRU_DEV
  TimeoutInMicroSeconds       - The time to wait for
   
Returns:

  EFI_STATUS

--*/
{
  UINT64  Delay;
  UINT8   StatusRegister;
  UINT8   ErrRegister;
  UINTN   Remainder;

  if (TimeoutInMicroSeconds == 0) {
    Delay = 2;
  } else {
    Delay = DivU64x32 (TimeoutInMicroSeconds, (UINT32) 30, &Remainder) + 1;
  }

  do {
    //
    //  read Status Register will clear interrupt
    //
    StatusRegister = ReadPortB (
                      AtapiScsiPrivate->PciIo,
                      AtapiScsiPrivate->IoPort->Reg.Status
                      );

    //
    //  BSY==0,DRQ==1
    //
    if ((StatusRegister & (BSY | DRQ)) == DRQ) {
      break;
    }

    if ((StatusRegister & (BSY | ERR)) == ERR) {

      ErrRegister = ReadPortB (
                      AtapiScsiPrivate->PciIo,
                      AtapiScsiPrivate->IoPort->Reg1.Error
                      );
      if ((ErrRegister & ABRT_ERR) == ABRT_ERR) {
        return EFI_ABORTED;
      }
    }

    //
    // Stall for 30 us
    //
    gBS->Stall (30);

    //
    // Loop infinitely if not meeting expected condition
    //
    if (TimeoutInMicroSeconds == 0) {
      Delay = 2;
    }

    Delay--;
  } while (Delay);

  if (Delay == 0) {
    return EFI_TIMEOUT;
  }

  return EFI_SUCCESS;
}

STATIC  
EFI_STATUS
AltStatusDRQReady (
  ATAPI_EXT_SCSI_PASS_THRU_DEV        *AtapiScsiPrivate,
  UINT64                              TimeoutInMicroSeconds
  )
/*++

Routine Description:

  Check whether DRQ is ready in the Alternate Status Register. 
  (BSY must also be cleared)
  If TimeoutInMicroSeconds is zero, this routine should wait infinitely for
  DRQ ready. Otherwise, it will return EFI_TIMEOUT when specified time is 
  elapsed.

Arguments:

  AtapiScsiPrivate            - The pointer of ATAPI_SCSI_PASS_THRU_DEV
  TimeoutInMicroSeconds       - The time to wait for
   
Returns:

  EFI_STATUS

--*/
{
  UINT64  Delay;
  UINT8   AltStatusRegister;
  UINT8   ErrRegister;
  UINTN   Remainder;

  if (TimeoutInMicroSeconds == 0) {
    Delay = 2;
  } else {
    Delay = DivU64x32 (TimeoutInMicroSeconds, (UINT32) 30, &Remainder) + 1;
  }

  do {
    //
    //  read Status Register will clear interrupt
    //
    AltStatusRegister = ReadPortB (
                          AtapiScsiPrivate->PciIo,
                          AtapiScsiPrivate->IoPort->Alt.AltStatus
                          );
    //
    //  BSY==0,DRQ==1
    //
    if ((AltStatusRegister & (BSY | DRQ)) == DRQ) {
      break;
    }

    if ((AltStatusRegister & (BSY | ERR)) == ERR) {

      ErrRegister = ReadPortB (
                      AtapiScsiPrivate->PciIo,
                      AtapiScsiPrivate->IoPort->Reg1.Error
                      );
      if ((ErrRegister & ABRT_ERR) == ABRT_ERR) {
        return EFI_ABORTED;
      }
    }

    //
    // Stall for 30 us
    //
    gBS->Stall (30);

    //
    // Loop infinitely if not meeting expected condition
    //
    if (TimeoutInMicroSeconds == 0) {
      Delay = 2;
    }

    Delay--;
  } while (Delay);

  if (Delay == 0) {
    return EFI_TIMEOUT;
  }

  return EFI_SUCCESS;
}

STATIC  
EFI_STATUS
StatusWaitForBSYClear (
  ATAPI_EXT_SCSI_PASS_THRU_DEV    *AtapiScsiPrivate,
  UINT64                          TimeoutInMicroSeconds
  )
/*++

Routine Description:

  Check whether BSY is clear in the Status Register.
  If TimeoutInMicroSeconds is zero, this routine should wait infinitely for
  BSY clear. Otherwise, it will return EFI_TIMEOUT when specified time is 
  elapsed.

Arguments:

  AtapiScsiPrivate            - The pointer of ATAPI_SCSI_PASS_THRU_DEV
  TimeoutInMicroSeconds       - The time to wait for
   
Returns:

  EFI_STATUS

--*/
{
  UINT64  Delay;
  UINT8   StatusRegister;
  UINTN   Remainder;

  if (TimeoutInMicroSeconds == 0) {
    Delay = 2;
  } else {
    Delay = DivU64x32 (TimeoutInMicroSeconds, (UINT32) 30, &Remainder) + 1;
  }

  do {

    StatusRegister = ReadPortB (
                      AtapiScsiPrivate->PciIo,
                      AtapiScsiPrivate->IoPort->Reg.Status
                      );
    if ((StatusRegister & BSY) == 0x00) {
      break;
    }

    //
    // Stall for 30 us
    //
    gBS->Stall (30);

    //
    // Loop infinitely if not meeting expected condition
    //
    if (TimeoutInMicroSeconds == 0) {
      Delay = 2;
    }

    Delay--;
  } while (Delay);

  if (Delay == 0) {
    return EFI_TIMEOUT;
  }

  return EFI_SUCCESS;
}

STATIC  
EFI_STATUS
AltStatusWaitForBSYClear (
  ATAPI_EXT_SCSI_PASS_THRU_DEV    *AtapiScsiPrivate,
  UINT64                          TimeoutInMicroSeconds
  )
/*++

Routine Description:

  Check whether BSY is clear in the Alternate Status Register.
  If TimeoutInMicroSeconds is zero, this routine should wait infinitely for
  BSY clear. Otherwise, it will return EFI_TIMEOUT when specified time is 
  elapsed.

Arguments:

  AtapiScsiPrivate            - The pointer of ATAPI_SCSI_PASS_THRU_DEV
  TimeoutInMicroSeconds       - The time to wait for
   
Returns:

  EFI_STATUS

--*/
{
  UINT64  Delay;
  UINT8   AltStatusRegister;
  UINTN   Remainder;

  if (TimeoutInMicroSeconds == 0) {
    Delay = 2;
  } else {
    Delay = DivU64x32 (TimeoutInMicroSeconds, (UINT32) 30, &Remainder) + 1;
  }

  do {

    AltStatusRegister = ReadPortB (
                          AtapiScsiPrivate->PciIo,
                          AtapiScsiPrivate->IoPort->Alt.AltStatus
                          );
    if ((AltStatusRegister & BSY) == 0x00) {
      break;
    }

    //
    // Stall for 30 us
    //
    gBS->Stall (30);
    //
    // Loop infinitely if not meeting expected condition
    //
    if (TimeoutInMicroSeconds == 0) {
      Delay = 2;
    }

    Delay--;
  } while (Delay);

  if (Delay == 0) {
    return EFI_TIMEOUT;
  }

  return EFI_SUCCESS;
}

STATIC  
EFI_STATUS
StatusDRDYReady (
  ATAPI_EXT_SCSI_PASS_THRU_DEV     *AtapiScsiPrivate,
  UINT64                           TimeoutInMicroSeconds
  )
/*++

Routine Description:

  Check whether DRDY is ready in the Status Register. 
  (BSY must also be cleared)
  If TimeoutInMicroSeconds is zero, this routine should wait infinitely for
  DRDY ready. Otherwise, it will return EFI_TIMEOUT when specified time is 
  elapsed.

Arguments:

  AtapiScsiPrivate            - The pointer of ATAPI_SCSI_PASS_THRU_DEV
  TimeoutInMicroSeconds       - The time to wait for
   
Returns:

  EFI_STATUS

--*/
{
  UINT64  Delay;
  UINT8   StatusRegister;
  UINT8   ErrRegister;
  UINTN   Remainder;

  if (TimeoutInMicroSeconds == 0) {
    Delay = 2;
  } else {
    Delay = DivU64x32 (TimeoutInMicroSeconds, (UINT32) 30, &Remainder) + 1;
  }

  do {
    StatusRegister = ReadPortB (
                      AtapiScsiPrivate->PciIo,
                      AtapiScsiPrivate->IoPort->Reg.Status
                      );
    //
    //  BSY == 0 , DRDY == 1
    //
    if ((StatusRegister & (DRDY | BSY)) == DRDY) {
      break;
    }

    if ((StatusRegister & (BSY | ERR)) == ERR) {

      ErrRegister = ReadPortB (
                      AtapiScsiPrivate->PciIo,
                      AtapiScsiPrivate->IoPort->Reg1.Error
                      );
      if ((ErrRegister & ABRT_ERR) == ABRT_ERR) {
        return EFI_ABORTED;
      }
    }
    
    //
    // Stall for 30 us
    //
    gBS->Stall (30);
    //
    // Loop infinitely if not meeting expected condition
    //
    if (TimeoutInMicroSeconds == 0) {
      Delay = 2;
    }

    Delay--;
  } while (Delay);

  if (Delay == 0) {
    return EFI_TIMEOUT;
  }

  return EFI_SUCCESS;
}


STATIC  
EFI_STATUS
AltStatusDRDYReady (
  ATAPI_EXT_SCSI_PASS_THRU_DEV     *AtapiScsiPrivate,
  UINT64                           TimeoutInMicroSeconds
  )
/*++

Routine Description:

  Check whether DRDY is ready in the Alternate Status Register. 
  (BSY must also be cleared)
  If TimeoutInMicroSeconds is zero, this routine should wait infinitely for
  DRDY ready. Otherwise, it will return EFI_TIMEOUT when specified time is 
  elapsed.

Arguments:

  AtapiScsiPrivate            - The pointer of ATAPI_SCSI_PASS_THRU_DEV
  TimeoutInMicroSeconds       - The time to wait for
   
Returns:

  EFI_STATUS

--*/
{
  UINT64  Delay;
  UINT8   AltStatusRegister;
  UINT8   ErrRegister;
  UINTN   Remainder;

  if (TimeoutInMicroSeconds == 0) {
    Delay = 2;
  } else {
    Delay = DivU64x32 (TimeoutInMicroSeconds, (UINT32) 30, &Remainder) + 1;
  }

  do {
    AltStatusRegister = ReadPor
atapiextpassthru.c - 源码说明

本页面展示了「EFI BIOS是Intel提出的下一代的BIOS标准。这里上传的Edk源代码是EFI BIOS源代码中的与平台无关部分的代码」中的 atapiextpassthru.c 源码文件，采用 C语言编程语言编写，共 2,448 行代码。您可以在线阅读完整代码内容，也可以返回资源详情页下载完整源码包进行本地学习和开发。
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