source: vbox/trunk/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseIoLibIntrinsic/IoLibFifo.c@ 107675

/** @file
  IoFifo read/write routines.

  Copyright (c) 2021 - 2023, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "BaseIoLibIntrinsicInternal.h"
#include <Uefi/UefiBaseType.h>

/**
  Reads an 8-bit I/O port fifo into a block of memory.

  Reads the 8-bit I/O fifo port specified by Port.
  The port is read Count times, and the read data is
  stored in the provided Buffer.

  This function must guarantee that all I/O read and write operations are
  serialized.

  If 8-bit I/O port operations are not supported, then ASSERT().

  In TDX a serial of TdIoRead8 is invoked to read the I/O port fifo.

  @param  Port    The I/O port to read.
  @param  Count   The number of times to read I/O port.
  @param  Buffer  The buffer to store the read data into.

**/
VOID
EFIAPI
IoReadFifo8 (
  IN      UINTN  Port,
  IN      UINTN  Count,
  OUT     VOID   *Buffer
  )
{
  UINT8  *Buffer8;

  Buffer8 = (UINT8 *)Buffer;
  while (Count-- > 0) {
    *Buffer8++ = IoRead8 (Port);
  }
}

/**
  Writes a block of memory into an 8-bit I/O port fifo.

  Writes the 8-bit I/O fifo port specified by Port.
  The port is written Count times, and the write data is
  retrieved from the provided Buffer.

  This function must guarantee that all I/O write and write operations are
  serialized.

  If 8-bit I/O port operations are not supported, then ASSERT().

  In TDX a serial of TdIoWrite8 is invoked to write data to the I/O port.

  @param  Port    The I/O port to write.
  @param  Count   The number of times to write I/O port.
  @param  Buffer  The buffer to retrieve the write data from.

**/
VOID
EFIAPI
IoWriteFifo8 (
  IN      UINTN  Port,
  IN      UINTN  Count,
  IN      VOID   *Buffer
  )
{
  UINT8  *Buffer8;

  Buffer8 = (UINT8 *)Buffer;
  while (Count-- > 0) {
    IoWrite8 (Port, *Buffer8++);
  }
}

/**
  Reads a 16-bit I/O port fifo into a block of memory.

  Reads the 16-bit I/O fifo port specified by Port.
  The port is read Count times, and the read data is
  stored in the provided Buffer.

  This function must guarantee that all I/O read and write operations are
  serialized.

  If 16-bit I/O port operations are not supported, then ASSERT().

  In TDX a serial of TdIoRead16 is invoked to read data from the I/O port.

  @param  Port    The I/O port to read.
  @param  Count   The number of times to read I/O port.
  @param  Buffer  The buffer to store the read data into.

**/
VOID
EFIAPI
IoReadFifo16 (
  IN      UINTN  Port,
  IN      UINTN  Count,
  OUT     VOID   *Buffer
  )
{
  UINT16  *Buffer16;

  Buffer16 = (UINT16 *)Buffer;
  while (Count-- > 0) {
    *Buffer16++ = IoRead16 (Port);
  }
}

/**
  Writes a block of memory into a 16-bit I/O port fifo.

  Writes the 16-bit I/O fifo port specified by Port.
  The port is written Count times, and the write data is
  retrieved from the provided Buffer.

  This function must guarantee that all I/O write and write operations are
  serialized.

  If 16-bit I/O port operations are not supported, then ASSERT().

  In TDX a serial of TdIoWrite16 is invoked to write data to the I/O port.

  @param  Port    The I/O port to write.
  @param  Count   The number of times to write I/O port.
  @param  Buffer  The buffer to retrieve the write data from.

**/
VOID
EFIAPI
IoWriteFifo16 (
  IN      UINTN  Port,
  IN      UINTN  Count,
  IN      VOID   *Buffer
  )
{
  UINT16  *Buffer16;

  Buffer16 = (UINT16 *)Buffer;
  while (Count-- > 0) {
    IoWrite16 (Port, *Buffer16++);
  }
}

/**
  Reads a 32-bit I/O port fifo into a block of memory.

  Reads the 32-bit I/O fifo port specified by Port.
  The port is read Count times, and the read data is
  stored in the provided Buffer.

  This function must guarantee that all I/O read and write operations are
  serialized.

  If 32-bit I/O port operations are not supported, then ASSERT().

  In TDX a serial of TdIoRead32 is invoked to read data from the I/O port.

  @param  Port    The I/O port to read.
  @param  Count   The number of times to read I/O port.
  @param  Buffer  The buffer to store the read data into.

**/
VOID
EFIAPI
IoReadFifo32 (
  IN      UINTN  Port,
  IN      UINTN  Count,
  OUT     VOID   *Buffer
  )
{
  UINT32  *Buffer32;

  Buffer32 = (UINT32 *)Buffer;
  while (Count-- > 0) {
    *Buffer32++ = IoRead32 (Port);
  }
}

/**
  Writes a block of memory into a 32-bit I/O port fifo.

  Writes the 32-bit I/O fifo port specified by Port.
  The port is written Count times, and the write data is
  retrieved from the provided Buffer.

  This function must guarantee that all I/O write and write operations are
  serialized.

  If 32-bit I/O port operations are not supported, then ASSERT().

  In TDX a serial of TdIoWrite32 is invoked to write data to the I/O port.

  @param  Port    The I/O port to write.
  @param  Count   The number of times to write I/O port.
  @param  Buffer  The buffer to retrieve the write data from.

**/
VOID
EFIAPI
IoWriteFifo32 (
  IN      UINTN  Port,
  IN      UINTN  Count,
  IN      VOID   *Buffer
  )
{
  UINT32  *Buffer32;

  Buffer32 = (UINT32 *)Buffer;
  while (Count-- > 0) {
    IoWrite32 (Port, *Buffer32++);
  }
}