/** @file

  Copyright (c) 2014 - 2015, Intel Corporation. All rights reserved.<BR>
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php.

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include <PiPei.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/PcdLib.h>
#include <FspGlobalData.h>
#include <FspApi.h>

#pragma pack(1)

//
//   Cont Func Parameter 2        +0x3C
//   Cont Func Parameter 1        +0x38
//
//   API Parameter                +0x34
//   API return address           +0x30
//
//   push    offset exit          +0x2C
//   pushfd                       +0x28
//   cli
//   pushad                       +0x24
//   sub     esp, 8               +0x00
//   sidt    fword ptr [esp]
//
typedef struct {
  UINT16    IdtrLimit;
  UINT32    IdtrBase;
  UINT16    Reserved;
  UINT32    Edi;
  UINT32    Esi;
  UINT32    Ebp;
  UINT32    Esp;
  UINT32    Ebx;
  UINT32    Edx;
  UINT32    Ecx;
  UINT32    Eax;
  UINT16    Flags[2];
  UINT32    ExitOff;
  UINT32    ApiRet;
  UINT32    ApiParam;
} CONTEXT_STACK;

#define CONTEXT_STACK_OFFSET(x)  (UINT32)&((CONTEXT_STACK *)(UINTN)0)->x

#pragma pack()

/**
  This function sets the FSP global data pointer.

  @param[in] FspData       Fsp global data pointer.

**/
VOID
EFIAPI
SetFspGlobalDataPointer (
  IN FSP_GLOBAL_DATA   *FspData
  )
{
  ASSERT (FspData != NULL);
  *((volatile UINT32 *)(UINTN)PcdGet32(PcdGlobalDataPointerAddress)) = (UINT32)(UINTN)FspData;
}

/**
  This function gets the FSP global data pointer.

**/
FSP_GLOBAL_DATA *
EFIAPI
GetFspGlobalDataPointer (
  VOID
  )
{
  FSP_GLOBAL_DATA   *FspData;

  FspData = *(FSP_GLOBAL_DATA  **)(UINTN)PcdGet32(PcdGlobalDataPointerAddress);
  return FspData;
}

/**
  This function gets back the FSP API paramter passed by the bootlaoder.

  @retval ApiParameter FSP API paramter passed by the bootlaoder.
**/
UINT32
EFIAPI
GetFspApiParameter (
  VOID
  )
{
  FSP_GLOBAL_DATA  *FspData;

  FspData  = GetFspGlobalDataPointer ();
  return *(UINT32 *)(UINTN)(FspData->CoreStack + CONTEXT_STACK_OFFSET(ApiParam));
}

/**
  This function sets the FSP API paramter in the stack.

   @param[in] Value       New parameter value.

**/
VOID
EFIAPI
SetFspApiParameter (
  IN UINT32      Value
  )
{
  FSP_GLOBAL_DATA  *FspData;

  FspData  = GetFspGlobalDataPointer ();
  *(UINT32 *)(UINTN)(FspData->CoreStack + CONTEXT_STACK_OFFSET(ApiParam)) = Value;
}

/**
  This function sets the FSP continuation function parameters in the stack.

  @param[in] Value             New parameter value to set.
  @param[in] Index             Parameter index.
**/
VOID
EFIAPI
SetFspContinuationFuncParameter (
  IN UINT32      Value,
  IN UINT32      Index
  )
{
  FSP_GLOBAL_DATA  *FspData;

  FspData  = GetFspGlobalDataPointer ();
  *(UINT32 *)(UINTN)(FspData->CoreStack + CONTEXT_STACK_OFFSET(ApiParam) + (Index + 1) * sizeof(UINT32)) = Value;
}


/**
  This function changes the BootLoader return address in stack.

  @param[in] ReturnAddress       Address to return.

**/
VOID
EFIAPI
SetFspApiReturnAddress (
  IN UINT32  ReturnAddress
  )
{
  FSP_GLOBAL_DATA  *FspData;

  FspData  = GetFspGlobalDataPointer ();
  *(UINT32 *)(UINTN)(FspData->CoreStack + CONTEXT_STACK_OFFSET(ApiRet)) = ReturnAddress;
}

/**
  This function set the API status code returned to the BootLoader.

  @param[in] ReturnStatus       Status code to return.

**/
VOID
EFIAPI
SetFspApiReturnStatus (
  IN UINT32  ReturnStatus
  )
{
  FSP_GLOBAL_DATA  *FspData;

  FspData  = GetFspGlobalDataPointer ();
  *(UINT32 *)(UINTN)(FspData->CoreStack + CONTEXT_STACK_OFFSET(Eax)) = ReturnStatus;
}

/**
  This function sets the context switching stack to a new stack frame.

  @param[in] NewStackTop       New core stack to be set.

**/
VOID
EFIAPI
SetFspCoreStackPointer (
  IN VOID   *NewStackTop
  )
{
  FSP_GLOBAL_DATA  *FspData;
  UINT32           *OldStack;
  UINT32           *NewStack;
  UINT32           StackContextLen;

  FspData  = GetFspGlobalDataPointer ();
  StackContextLen = sizeof(CONTEXT_STACK) / sizeof(UINT32);

  //
  // Reserve space for the ContinuationFunc two parameters
  //
  OldStack = (UINT32 *)FspData->CoreStack;
  NewStack = (UINT32 *)NewStackTop - StackContextLen - 2;
  FspData->CoreStack = (UINT32)NewStack;
  while (StackContextLen-- != 0) {
    *NewStack++ = *OldStack++;
  }
}

/**
  This function sets the platform specific data pointer.

  @param[in] PlatformData       Fsp platform specific data pointer.

**/
VOID
EFIAPI
SetFspPlatformDataPointer (
  IN VOID   *PlatformData
  )
{
  FSP_GLOBAL_DATA  *FspData;

  FspData  = GetFspGlobalDataPointer ();
  FspData->PlatformData.DataPtr = PlatformData;
}


/**
  This function gets the platform specific data pointer.

   @param[in] PlatformData       Fsp platform specific data pointer.

**/
VOID *
EFIAPI
GetFspPlatformDataPointer (
  VOID
  )
{
  FSP_GLOBAL_DATA  *FspData;

  FspData  = GetFspGlobalDataPointer ();
  return FspData->PlatformData.DataPtr;
}


/**
  This function sets the UPD data pointer.

  @param[in] UpdDataRgnPtr   UPD data pointer.
**/
VOID
EFIAPI
SetFspUpdDataPointer (
  IN VOID    *UpdDataRgnPtr
  )
{
  FSP_GLOBAL_DATA  *FspData;

  //
  // Get the Fsp Global Data Pointer
  //
  FspData  = GetFspGlobalDataPointer ();

  //
  // Set the UPD pointer.
  //
  FspData->UpdDataRgnPtr = UpdDataRgnPtr;
}

/**
  This function gets the UPD data pointer.

  @return UpdDataRgnPtr   UPD data pointer.
**/
VOID *
EFIAPI
GetFspUpdDataPointer (
  VOID
  )
{
  FSP_GLOBAL_DATA  *FspData;

  FspData  = GetFspGlobalDataPointer ();
  return FspData->UpdDataRgnPtr;
}

/**
  Set FSP measurement point timestamp.

  @param[in] Id       Measurement point ID.

  @return performance timestamp.
**/
UINT64
EFIAPI
SetFspMeasurePoint (
  IN UINT8  Id
  )
{
  FSP_GLOBAL_DATA  *FspData;

  //
  // Bit [55: 0]  will be the timestamp
  // Bit [63:56]  will be the ID
  //
  FspData  = GetFspGlobalDataPointer ();
  if (FspData->PerfIdx < sizeof(FspData->PerfData) / sizeof(FspData->PerfData[0])) {
    FspData->PerfData[FspData->PerfIdx] = AsmReadTsc ();
    ((UINT8 *)(&FspData->PerfData[FspData->PerfIdx]))[7] = Id;
  }

  return FspData->PerfData[(FspData->PerfIdx)++];
}

/**
  This function gets the FSP info header pointer.

  @retval FspInfoHeader   FSP info header pointer
**/
FSP_INFO_HEADER *
EFIAPI
GetFspInfoHeader (
  VOID
  )
{
  return  GetFspGlobalDataPointer()->FspInfoHeader;
}

/**
  This function gets the VPD data pointer.

  @return VpdDataRgnPtr   VPD data pointer.
**/
VOID *
EFIAPI
GetFspVpdDataPointer (
  VOID
  )
{
  FSP_INFO_HEADER   *FspInfoHeader;

  FspInfoHeader = GetFspInfoHeader ();
  return (VOID *)(FspInfoHeader->ImageBase + FspInfoHeader->CfgRegionOffset);
}

/**
  This function gets FSP API calling mode.

  @retval API calling mode
**/
UINT8
EFIAPI
GetFspApiCallingMode (
  VOID
  )
{
  return  GetFspGlobalDataPointer()->ApiMode;
}

/**
  This function sets FSP API calling mode.

  @param[in] Mode     API calling mode
**/
VOID
EFIAPI
SetFspApiCallingMode (
  UINT8  Mode
  )
{
  FSP_GLOBAL_DATA  *FspData;

  FspData  = GetFspGlobalDataPointer ();
  FspData->ApiMode = Mode;
}