/** @file
  API for SMBIOS table.

  Copyright (c) 2005 - 2018, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "UefiShellDebug1CommandsLib.h"
#include <Guid/SmBios.h>
#include "LibSmbiosView.h"
#include "SmbiosView.h"

STATIC UINT8                         mInit              = 0;
STATIC UINT8                         m64Init            = 0;
STATIC SMBIOS_TABLE_ENTRY_POINT      *mSmbiosTable      = NULL;
STATIC SMBIOS_TABLE_3_0_ENTRY_POINT  *mSmbios64BitTable = NULL;
STATIC SMBIOS_STRUCTURE_POINTER      m_SmbiosStruct;
STATIC SMBIOS_STRUCTURE_POINTER      *mSmbiosStruct = &m_SmbiosStruct;
STATIC SMBIOS_STRUCTURE_POINTER      m_Smbios64BitStruct;
STATIC SMBIOS_STRUCTURE_POINTER      *mSmbios64BitStruct = &m_Smbios64BitStruct;

/**
  Init the SMBIOS VIEW API's environment.

  @retval EFI_SUCCESS  Successful to init the SMBIOS VIEW Lib.
**/
EFI_STATUS
LibSmbiosInit (
  VOID
  )
{
  EFI_STATUS  Status;

  //
  // Init only once
  //
  if (mInit == 1) {
    return EFI_SUCCESS;
  }

  //
  // Get SMBIOS table from System Configure table
  //
  Status = GetSystemConfigurationTable (&gEfiSmbiosTableGuid, (VOID **)&mSmbiosTable);

  if (mSmbiosTable == NULL) {
    return EFI_NOT_FOUND;
  }

  if (EFI_ERROR (Status)) {
    ShellPrintHiiDefaultEx (STRING_TOKEN (STR_SMBIOSVIEW_LIBSMBIOSVIEW_GET_TABLE_ERROR), gShellDebug1HiiHandle, Status);
    return Status;
  }

  //
  // Init SMBIOS structure table address
  //
  mSmbiosStruct->Raw = (UINT8 *)(UINTN)(mSmbiosTable->TableAddress);

  mInit = 1;
  return EFI_SUCCESS;
}

/**
  Init the SMBIOS VIEW API's environment.

  @retval EFI_SUCCESS  Successful to init the SMBIOS VIEW Lib.
**/
EFI_STATUS
LibSmbios64BitInit (
  VOID
  )
{
  EFI_STATUS  Status;

  //
  // Init only once
  //
  if (m64Init == 1) {
    return EFI_SUCCESS;
  }

  //
  // Get SMBIOS table from System Configure table
  //
  Status = GetSystemConfigurationTable (&gEfiSmbios3TableGuid, (VOID **)&mSmbios64BitTable);

  if (mSmbios64BitTable == NULL) {
    return EFI_NOT_FOUND;
  }

  if (EFI_ERROR (Status)) {
    ShellPrintHiiDefaultEx (STRING_TOKEN (STR_SMBIOSVIEW_LIBSMBIOSVIEW_GET_TABLE_ERROR), gShellDebug1HiiHandle, Status);
    return Status;
  }

  //
  // Init SMBIOS structure table address
  //
  mSmbios64BitStruct->Raw = (UINT8 *)(UINTN)(mSmbios64BitTable->TableAddress);

  m64Init = 1;
  return EFI_SUCCESS;
}

/**
  Cleanup the Smbios information.
**/
VOID
LibSmbiosCleanup (
  VOID
  )
{
  //
  // Release resources
  //
  if (mSmbiosTable != NULL) {
    mSmbiosTable = NULL;
  }

  mInit = 0;
}

/**
  Cleanup the Smbios information.
**/
VOID
LibSmbios64BitCleanup (
  VOID
  )
{
  //
  // Release resources
  //
  if (mSmbios64BitTable != NULL) {
    mSmbios64BitTable = NULL;
  }

  m64Init = 0;
}

/**
  Get the entry point structure for the table.

  @param[out] EntryPointStructure  The pointer to populate.
**/
VOID
LibSmbiosGetEPS (
  OUT SMBIOS_TABLE_ENTRY_POINT  **EntryPointStructure
  )
{
  //
  // return SMBIOS Table address
  //
  *EntryPointStructure = mSmbiosTable;
}

/**
  Get the entry point structure for the table.

  @param[out] EntryPointStructure  The pointer to populate.
**/
VOID
LibSmbios64BitGetEPS (
  OUT SMBIOS_TABLE_3_0_ENTRY_POINT  **EntryPointStructure
  )
{
  //
  // return SMBIOS Table address
  //
  *EntryPointStructure = mSmbios64BitTable;
}

/**
  Return SMBIOS string for the given string number.

  @param[in] Smbios         Pointer to SMBIOS structure.
  @param[in] StringNumber   String number to return. -1 is used to skip all strings and
                            point to the next SMBIOS structure.

  @return Pointer to string, or pointer to next SMBIOS strcuture if StringNumber == -1
**/
CHAR8 *
LibGetSmbiosString (
  IN  SMBIOS_STRUCTURE_POINTER  *Smbios,
  IN  UINT16                    StringNumber
  )
{
  UINT16  Index;
  CHAR8   *String;

  ASSERT (Smbios != NULL);

  //
  // Skip over formatted section
  //
  String = (CHAR8 *)(Smbios->Raw + Smbios->Hdr->Length);

  //
  // Look through unformated section
  //
  for (Index = 1; Index <= StringNumber; Index++) {
    if (StringNumber == Index) {
      return String;
    }

    //
    // Skip string
    //
    for ( ; *String != 0; String++) {
    }

    String++;

    if (*String == 0) {
      //
      // If double NULL then we are done.
      //  Return pointer to next structure in Smbios.
      //  if you pass in a -1 you will always get here
      //
      Smbios->Raw = (UINT8 *)++String;
      return NULL;
    }
  }

  return NULL;
}

/**
    Get SMBIOS structure for the given Handle,
    Handle is changed to the next handle or 0xFFFF when the end is
    reached or the handle is not found.

    @param[in, out] Handle     0xFFFF: get the first structure
                               Others: get a structure according to this value.
    @param[out] Buffer         The pointer to the pointer to the structure.
    @param[out] Length         Length of the structure.

    @retval DMI_SUCCESS   Handle is updated with next structure handle or
                          0xFFFF(end-of-list).

    @retval DMI_INVALID_HANDLE  Handle is updated with first structure handle or
                                0xFFFF(end-of-list).
**/
EFI_STATUS
LibGetSmbiosStructure (
  IN  OUT UINT16  *Handle,
  OUT UINT8       **Buffer,
  OUT UINT16      *Length
  )
{
  SMBIOS_STRUCTURE_POINTER  Smbios;
  SMBIOS_STRUCTURE_POINTER  SmbiosEnd;
  UINT8                     *Raw;

  if (*Handle == INVALID_HANDLE) {
    *Handle = mSmbiosStruct->Hdr->Handle;
    return DMI_INVALID_HANDLE;
  }

  if ((Buffer == NULL) || (Length == NULL)) {
    ShellPrintHiiDefaultEx (STRING_TOKEN (STR_SMBIOSVIEW_LIBSMBIOSVIEW_NO_BUFF_LEN_SPEC), gShellDebug1HiiHandle);
    return DMI_INVALID_HANDLE;
  }

  *Length       = 0;
  Smbios.Hdr    = mSmbiosStruct->Hdr;
  SmbiosEnd.Raw = Smbios.Raw + mSmbiosTable->TableLength;
  while (Smbios.Raw < SmbiosEnd.Raw) {
    if (Smbios.Hdr->Handle == *Handle) {
      Raw = Smbios.Raw;
      //
      // Walk to next structure
      //
      LibGetSmbiosString (&Smbios, (UINT16)(-1));
      //
      // Length = Next structure head - this structure head
      //
      *Length = (UINT16)(Smbios.Raw - Raw);
      *Buffer = Raw;
      //
      // update with the next structure handle.
      //
      if (Smbios.Raw < SmbiosEnd.Raw) {
        *Handle = Smbios.Hdr->Handle;
      } else {
        *Handle = INVALID_HANDLE;
      }

      return DMI_SUCCESS;
    }

    //
    // Walk to next structure
    //
    LibGetSmbiosString (&Smbios, (UINT16)(-1));
  }

  *Handle = INVALID_HANDLE;
  return DMI_INVALID_HANDLE;
}

/**
    Get SMBIOS structure for the given Handle,
    Handle is changed to the next handle or 0xFFFF when the end is
    reached or the handle is not found.

    @param[in, out] Handle     0xFFFF: get the first structure
                               Others: get a structure according to this value.
    @param[out] Buffer         The pointer to the pointer to the structure.
    @param[out] Length         Length of the structure.

    @retval DMI_SUCCESS   Handle is updated with next structure handle or
                          0xFFFF(end-of-list).

    @retval DMI_INVALID_HANDLE  Handle is updated with first structure handle or
                                0xFFFF(end-of-list).
**/
EFI_STATUS
LibGetSmbios64BitStructure (
  IN  OUT UINT16  *Handle,
  OUT UINT8       **Buffer,
  OUT UINT16      *Length
  )
{
  SMBIOS_STRUCTURE_POINTER  Smbios;
  SMBIOS_STRUCTURE_POINTER  SmbiosEnd;
  UINT8                     *Raw;

  if (*Handle == INVALID_HANDLE) {
    *Handle = mSmbios64BitStruct->Hdr->Handle;
    return DMI_INVALID_HANDLE;
  }

  if ((Buffer == NULL) || (Length == NULL)) {
    ShellPrintHiiDefaultEx (STRING_TOKEN (STR_SMBIOSVIEW_LIBSMBIOSVIEW_NO_BUFF_LEN_SPEC), gShellDebug1HiiHandle);
    return DMI_INVALID_HANDLE;
  }

  *Length    = 0;
  Smbios.Hdr = mSmbios64BitStruct->Hdr;

  SmbiosEnd.Raw = Smbios.Raw + mSmbios64BitTableLength;
  while (Smbios.Raw < SmbiosEnd.Raw) {
    if (Smbios.Hdr->Handle == *Handle) {
      Raw = Smbios.Raw;
      //
      // Walk to next structure
      //
      LibGetSmbiosString (&Smbios, (UINT16)(-1));
      //
      // Length = Next structure head - this structure head
      //
      *Length = (UINT16)(Smbios.Raw - Raw);
      *Buffer = Raw;
      //
      // update with the next structure handle.
      //
      if (Smbios.Raw < SmbiosEnd.Raw) {
        *Handle = Smbios.Hdr->Handle;
      } else {
        *Handle = INVALID_HANDLE;
      }

      return DMI_SUCCESS;
    }

    //
    // Walk to next structure
    //
    LibGetSmbiosString (&Smbios, (UINT16)(-1));
  }

  *Handle = INVALID_HANDLE;
  return DMI_INVALID_HANDLE;
}