system76-edk2/MdePkg/Library/DxeIoLibCpuIo2/IoLibMmioBuffer.c

/** @file
  I/O Library MMIO Buffer Functions.

  Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "DxeCpuIo2LibInternal.h"

/**
  Copy data from MMIO region to system memory by using 8-bit access.

  Copy data from MMIO region specified by starting address StartAddress
  to system memory specified by Buffer by using 8-bit access. The total
  number of byte to be copied is specified by Length. Buffer is returned.

  If Length is greater than (MAX_ADDRESS - StartAddress + 1), then ASSERT().
  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().


  @param  StartAddress    The starting address for the MMIO region to be copied from.
  @param  Length          The size in bytes of the copy.
  @param  Buffer          The pointer to a system memory buffer receiving the data read.

  @return Buffer

**/
UINT8 *
EFIAPI
MmioReadBuffer8 (
  IN  UINTN  StartAddress,
  IN  UINTN  Length,
  OUT UINT8  *Buffer
  )
{
  UINT8  *ReturnBuffer;

  ASSERT ((Length - 1) <=  (MAX_ADDRESS - StartAddress));
  ASSERT ((Length - 1) <=  (MAX_ADDRESS - (UINTN)Buffer));

  ReturnBuffer = Buffer;

  while (Length-- > 0) {
    *(Buffer++) = MmioRead8 (StartAddress++);
  }

  return ReturnBuffer;
}

/**
  Copy data from MMIO region to system memory by using 16-bit access.

  Copy data from MMIO region specified by starting address StartAddress
  to system memory specified by Buffer by using 16-bit access. The total
  number of byte to be copied is specified by Length. Buffer is returned.

  If StartAddress is not aligned on a 16-bit boundary, then ASSERT().

  If Length is greater than (MAX_ADDRESS - StartAddress + 1), then ASSERT().
  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().

  If Length is not aligned on a 16-bit boundary, then ASSERT().

  If Buffer is not aligned on a 16-bit boundary, then ASSERT().

  @param  StartAddress    The starting address for the MMIO region to be copied from.
  @param  Length          The size in bytes of the copy.
  @param  Buffer          The pointer to a system memory buffer receiving the data read.

  @return Buffer.

**/
UINT16 *
EFIAPI
MmioReadBuffer16 (
  IN  UINTN   StartAddress,
  IN  UINTN   Length,
  OUT UINT16  *Buffer
  )
{
  UINT16  *ReturnBuffer;

  ASSERT ((StartAddress & (sizeof (UINT16) - 1)) == 0);

  ASSERT ((Length - 1) <=  (MAX_ADDRESS - StartAddress));
  ASSERT ((Length - 1) <=  (MAX_ADDRESS - (UINTN)Buffer));

  ASSERT ((Length & (sizeof (UINT16) - 1)) == 0);
  ASSERT (((UINTN)Buffer & (sizeof (UINT16) - 1)) == 0);

  ReturnBuffer = Buffer;

  while (Length > 0) {
    *(Buffer++)   = MmioRead16 (StartAddress);
    StartAddress += sizeof (UINT16);
    Length       -= sizeof (UINT16);
  }

  return ReturnBuffer;
}

/**
  Copy data from MMIO region to system memory by using 32-bit access.

  Copy data from MMIO region specified by starting address StartAddress
  to system memory specified by Buffer by using 32-bit access. The total
  number of byte to be copied is specified by Length. Buffer is returned.

  If StartAddress is not aligned on a 32-bit boundary, then ASSERT().

  If Length is greater than (MAX_ADDRESS - StartAddress + 1), then ASSERT().
  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().

  If Length is not aligned on a 32-bit boundary, then ASSERT().
  If Buffer is not aligned on a 32-bit boundary, then ASSERT().

  @param  StartAddress    The starting address for the MMIO region to be copied from.
  @param  Length          The size in bytes of the copy.
  @param  Buffer          The pointer to a system memory buffer receiving the data read.

  @return Buffer.

**/
UINT32 *
EFIAPI
MmioReadBuffer32 (
  IN  UINTN   StartAddress,
  IN  UINTN   Length,
  OUT UINT32  *Buffer
  )
{
  UINT32  *ReturnBuffer;

  ASSERT ((StartAddress & (sizeof (UINT32) - 1)) == 0);

  ASSERT ((Length - 1) <=  (MAX_ADDRESS - StartAddress));
  ASSERT ((Length - 1) <=  (MAX_ADDRESS - (UINTN)Buffer));

  ASSERT ((Length & (sizeof (UINT32) - 1)) == 0);
  ASSERT (((UINTN)Buffer & (sizeof (UINT32) - 1)) == 0);

  ReturnBuffer = Buffer;

  while (Length > 0) {
    *(Buffer++)   = MmioRead32 (StartAddress);
    StartAddress += sizeof (UINT32);
    Length       -= sizeof (UINT32);
  }

  return ReturnBuffer;
}

/**
  Copy data from MMIO region to system memory by using 64-bit access.

  Copy data from MMIO region specified by starting address StartAddress
  to system memory specified by Buffer by using 64-bit access. The total
  number of byte to be copied is specified by Length. Buffer is returned.

  If StartAddress is not aligned on a 64-bit boundary, then ASSERT().

  If Length is greater than (MAX_ADDRESS - StartAddress + 1), then ASSERT().
  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().

  If Length is not aligned on a 64-bit boundary, then ASSERT().

  If Buffer is not aligned on a 64-bit boundary, then ASSERT().

  @param  StartAddress    The starting address for the MMIO region to be copied from.
  @param  Length          The size in bytes of the copy.
  @param  Buffer          The pointer to a system memory buffer receiving the data read.

  @return Buffer.

**/
UINT64 *
EFIAPI
MmioReadBuffer64 (
  IN  UINTN   StartAddress,
  IN  UINTN   Length,
  OUT UINT64  *Buffer
  )
{
  UINT64  *ReturnBuffer;

  ASSERT ((StartAddress & (sizeof (UINT64) - 1)) == 0);

  ASSERT ((Length - 1) <=  (MAX_ADDRESS - StartAddress));
  ASSERT ((Length - 1) <=  (MAX_ADDRESS - (UINTN)Buffer));

  ASSERT ((Length & (sizeof (UINT64) - 1)) == 0);
  ASSERT (((UINTN)Buffer & (sizeof (UINT64) - 1)) == 0);

  ReturnBuffer = Buffer;

  while (Length > 0) {
    *(Buffer++)   = MmioRead64 (StartAddress);
    StartAddress += sizeof (UINT64);
    Length       -= sizeof (UINT64);
  }

  return ReturnBuffer;
}

/**
  Copy data from system memory to MMIO region by using 8-bit access.

  Copy data from system memory specified by Buffer to MMIO region specified
  by starting address StartAddress by using 8-bit access. The total number
  of byte to be copied is specified by Length. Buffer is returned.

  If Length is greater than (MAX_ADDRESS - StartAddress + 1), then ASSERT().
  If Length is greater than (MAX_ADDRESS -Buffer + 1), then ASSERT().


  @param  StartAddress    The starting address for the MMIO region to be copied to.
  @param  Length          The size in bytes of the copy.
  @param  Buffer          The pointer to a system memory buffer containing the data to write.

  @return Buffer.

**/
UINT8 *
EFIAPI
MmioWriteBuffer8 (
  IN  UINTN        StartAddress,
  IN  UINTN        Length,
  IN  CONST UINT8  *Buffer
  )
{
  VOID  *ReturnBuffer;

  ASSERT ((Length - 1) <=  (MAX_ADDRESS - StartAddress));
  ASSERT ((Length - 1) <=  (MAX_ADDRESS - (UINTN)Buffer));

  ReturnBuffer = (UINT8 *)Buffer;

  while (Length-- > 0) {
    MmioWrite8 (StartAddress++, *(Buffer++));
  }

  return ReturnBuffer;
}

/**
  Copy data from system memory to MMIO region by using 16-bit access.

  Copy data from system memory specified by Buffer to MMIO region specified
  by starting address StartAddress by using 16-bit access. The total number
  of byte to be copied is specified by Length. Buffer is returned.

  If StartAddress is not aligned on a 16-bit boundary, then ASSERT().

  If Length is greater than (MAX_ADDRESS - StartAddress + 1), then ASSERT().
  If Length is greater than (MAX_ADDRESS -Buffer + 1), then ASSERT().

  If Length is not aligned on a 16-bit boundary, then ASSERT().

  If Buffer is not aligned on a 16-bit boundary, then ASSERT().

  @param  StartAddress    The starting address for the MMIO region to be copied to.
  @param  Length          The size in bytes of the copy.
  @param  Buffer          The pointer to a system memory buffer containing the data to write.

  @return Buffer.

**/
UINT16 *
EFIAPI
MmioWriteBuffer16 (
  IN  UINTN         StartAddress,
  IN  UINTN         Length,
  IN  CONST UINT16  *Buffer
  )
{
  UINT16  *ReturnBuffer;

  ASSERT ((StartAddress & (sizeof (UINT16) - 1)) == 0);

  ASSERT ((Length - 1) <=  (MAX_ADDRESS - StartAddress));
  ASSERT ((Length - 1) <=  (MAX_ADDRESS - (UINTN)Buffer));

  ASSERT ((Length & (sizeof (UINT16) - 1)) == 0);
  ASSERT (((UINTN)Buffer & (sizeof (UINT16) - 1)) == 0);

  ReturnBuffer = (UINT16 *)Buffer;

  while (Length > 0) {
    MmioWrite16 (StartAddress, *(Buffer++));

    StartAddress += sizeof (UINT16);
    Length       -= sizeof (UINT16);
  }

  return ReturnBuffer;
}

/**
  Copy data from system memory to MMIO region by using 32-bit access.

  Copy data from system memory specified by Buffer to MMIO region specified
  by starting address StartAddress by using 32-bit access. The total number
  of byte to be copied is specified by Length. Buffer is returned.

  If StartAddress is not aligned on a 32-bit boundary, then ASSERT().

  If Length is greater than (MAX_ADDRESS - StartAddress + 1), then ASSERT().
  If Length is greater than (MAX_ADDRESS -Buffer + 1), then ASSERT().

  If Length is not aligned on a 32-bit boundary, then ASSERT().

  If Buffer is not aligned on a 32-bit boundary, then ASSERT().

  @param  StartAddress    The starting address for the MMIO region to be copied to.
  @param  Length          The size in bytes of the copy.
  @param  Buffer          The pointer to a system memory buffer containing the data to write.

  @return Buffer.

**/
UINT32 *
EFIAPI
MmioWriteBuffer32 (
  IN  UINTN         StartAddress,
  IN  UINTN         Length,
  IN  CONST UINT32  *Buffer
  )
{
  UINT32  *ReturnBuffer;

  ASSERT ((StartAddress & (sizeof (UINT32) - 1)) == 0);

  ASSERT ((Length - 1) <=  (MAX_ADDRESS - StartAddress));
  ASSERT ((Length - 1) <=  (MAX_ADDRESS - (UINTN)Buffer));

  ASSERT ((Length & (sizeof (UINT32) - 1)) == 0);
  ASSERT (((UINTN)Buffer & (sizeof (UINT32) - 1)) == 0);

  ReturnBuffer = (UINT32 *)Buffer;

  while (Length > 0) {
    MmioWrite32 (StartAddress, *(Buffer++));

    StartAddress += sizeof (UINT32);
    Length       -= sizeof (UINT32);
  }

  return ReturnBuffer;
}

/**
  Copy data from system memory to MMIO region by using 64-bit access.

  Copy data from system memory specified by Buffer to MMIO region specified
  by starting address StartAddress by using 64-bit access. The total number
  of byte to be copied is specified by Length. Buffer is returned.

  If StartAddress is not aligned on a 64-bit boundary, then ASSERT().

  If Length is greater than (MAX_ADDRESS - StartAddress + 1), then ASSERT().
  If Length is greater than (MAX_ADDRESS -Buffer + 1), then ASSERT().

  If Length is not aligned on a 64-bit boundary, then ASSERT().

  If Buffer is not aligned on a 64-bit boundary, then ASSERT().

  @param  StartAddress    The starting address for the MMIO region to be copied to.
  @param  Length          The size in bytes of the copy.
  @param  Buffer          The pointer to a system memory buffer containing the data to write.

  @return Buffer.

**/
UINT64 *
EFIAPI
MmioWriteBuffer64 (
  IN  UINTN         StartAddress,
  IN  UINTN         Length,
  IN  CONST UINT64  *Buffer
  )
{
  UINT64  *ReturnBuffer;

  ASSERT ((StartAddress & (sizeof (UINT64) - 1)) == 0);

  ASSERT ((Length - 1) <=  (MAX_ADDRESS - StartAddress));
  ASSERT ((Length - 1) <=  (MAX_ADDRESS - (UINTN)Buffer));

  ASSERT ((Length & (sizeof (UINT64) - 1)) == 0);
  ASSERT (((UINTN)Buffer & (sizeof (UINT64) - 1)) == 0);

  ReturnBuffer = (UINT64 *)Buffer;

  while (Length > 0) {
    MmioWrite64 (StartAddress, *(Buffer++));

    StartAddress += sizeof (UINT64);
    Length       -= sizeof (UINT64);
  }

  return ReturnBuffer;
}