/*++

Copyright (c) 2006, Intel Corporation                                                         
All rights reserved. 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.             

Module Name:

  Performance.c

Abstract:

  This file include the file which can help to get the system
  performance, all the function will only include if the performance
  switch is set.

--*/

#include "Performance.h"

VOID
ClearDebugRegisters (
  VOID
  )
{
  //
  // BugBug: We should not need to do this. We need to root cause this bug!!!!
  //
  AsmWriteDr0 (0);
  AsmWriteDr1 (0);
}

STATIC
VOID
GetShortPdbFileName (
  CHAR8  *PdbFileName,
  CHAR8  *GaugeString
  )
/*++

Routine Description:
  
Arguments:

Returns:

--*/
{
  UINTN Index;
  UINTN Index1;
  UINTN StartIndex;
  UINTN EndIndex;

  if (PdbFileName == NULL) {
    AsciiStrCpy (GaugeString, " ");
  } else {
    StartIndex = 0;
    for (EndIndex = 0; PdbFileName[EndIndex] != 0; EndIndex++)
      ;

    for (Index = 0; PdbFileName[Index] != 0; Index++) {
      if (PdbFileName[Index] == '\\') {
        StartIndex = Index + 1;
      }

      if (PdbFileName[Index] == '.') {
        EndIndex = Index;
      }
    }

    Index1 = 0;
    for (Index = StartIndex; Index < EndIndex; Index++) {
      GaugeString[Index1] = PdbFileName[Index];
      Index1++;
      if (Index1 == PERF_TOKEN_LENGTH - 1) {
        break;
      }
    }

    GaugeString[Index1] = 0;
  }

  return ;
}



STATIC
CHAR8 *
GetPdbPath (
  VOID *ImageBase
  )
/*++

Routine Description:

  Located PDB path name in PE image

Arguments:

  ImageBase - base of PE to search

Returns:

  Pointer into image at offset of PDB file name if PDB file name is found,
  Otherwise a pointer to an empty string.

--*/
{
  PE_COFF_LOADER_IMAGE_CONTEXT          ImageContext;

  ZeroMem (&ImageContext, sizeof (ImageContext));
  ImageContext.Handle    = ImageBase;
  ImageContext.ImageRead = PeCoffLoaderImageReadFromMemory;

  PeCoffLoaderGetImageInfo (&ImageContext);

  return ImageContext.PdbPointer;
}


STATIC
VOID
GetNameFromHandle (
  IN  EFI_HANDLE     Handle,
  OUT CHAR8          *GaugeString
  )
{
  EFI_STATUS                  Status;
  EFI_LOADED_IMAGE_PROTOCOL   *Image;
  CHAR8                       *PdbFileName;
  EFI_DRIVER_BINDING_PROTOCOL *DriverBinding;

  AsciiStrCpy (GaugeString, " ");

  //
  // Get handle name from image protocol
  //
  Status = gBS->HandleProtocol (
                  Handle,
                  &gEfiLoadedImageProtocolGuid,
                  (VOID **)&Image
                  );

  if (EFI_ERROR (Status)) {
    Status = gBS->OpenProtocol (
                    Handle,
                    &gEfiDriverBindingProtocolGuid,
                    (VOID **) &DriverBinding,
                    NULL,
                    NULL,
                    EFI_OPEN_PROTOCOL_GET_PROTOCOL
                    );
    if (EFI_ERROR (Status)) {
      return ;
    }
    //
    // Get handle name from image protocol
    //
    Status = gBS->HandleProtocol (
                    DriverBinding->ImageHandle,
                    &gEfiLoadedImageProtocolGuid,
                    (VOID **)&Image
                    );
  }

  PdbFileName = GetPdbPath (Image->ImageBase);

  if (PdbFileName != NULL) {
    GetShortPdbFileName (PdbFileName, GaugeString);
  }

  return ;
}



VOID
WriteBootToOsPerformanceData (
  VOID
  )
/*++

Routine Description:
  
  Allocates a block of memory and writes performance data of booting to OS into it.

Arguments:
  
  None
  
Returns:

  None

--*/
{
  EFI_STATUS                Status;
  EFI_CPU_ARCH_PROTOCOL     *Cpu;
  EFI_PHYSICAL_ADDRESS      mAcpiLowMemoryBase;
  UINT32                    mAcpiLowMemoryLength;
  UINT32                    LimitCount;
  PERF_HEADER               mPerfHeader;
  PERF_DATA                 mPerfData;
  EFI_HANDLE                *Handles;
  UINTN                     NoHandles;
  CHAR8                     GaugeString[PERF_TOKEN_LENGTH];
  UINT8                     *Ptr;
  UINT32                    mIndex;
  UINT64                    Ticker;
  UINT64                    Freq;
  UINT32                    Duration;
  UINT64                    CurrentTicker;
  UINT64                    TimerPeriod;
  UINTN                     LogEntryKey;
  CONST VOID                *Handle;
  CONST CHAR8               *Token;
  CONST CHAR8               *Module;
  UINT64                    StartTicker;
  UINT64                    EndTicker;

  //
  // Retrive time stamp count as early as possilbe
  //
  Ticker = AsmReadTsc ();

  //
  // Allocate a block of memory that contain performance data to OS
  //
  mAcpiLowMemoryBase = 0xFFFFFFFF;
  Status = gBS->AllocatePages (
                  AllocateMaxAddress,
                  EfiReservedMemoryType,
                  4,
                  &mAcpiLowMemoryBase
                  );
  if (EFI_ERROR (Status)) {
    return ;
  }

  mAcpiLowMemoryLength  = EFI_PAGES_TO_SIZE(4);

  Ptr                   = (UINT8 *) ((UINT32) mAcpiLowMemoryBase + sizeof (PERF_HEADER));
  LimitCount            = (mAcpiLowMemoryLength - sizeof (PERF_HEADER)) / sizeof (PERF_DATA);

  //
  // Initialize performance data structure
  //
  ZeroMem (&mPerfHeader, sizeof (PERF_HEADER));

  //
  // Get CPU frequency
  //
  Status = gBS->LocateProtocol (
                  &gEfiCpuArchProtocolGuid,
                  NULL,
                  (VOID **)&Cpu
                  );
  if (EFI_ERROR (Status)) {
    gBS->FreePages (mAcpiLowMemoryBase, 4);
    return ;
  }
  //
  // Get Cpu Frequency
  //
  Status = Cpu->GetTimerValue (Cpu, 0, &(CurrentTicker), &TimerPeriod);
  if (EFI_ERROR (Status)) {
    gBS->FreePages (mAcpiLowMemoryBase, 4);
    return ;
  }

  Freq                = DivU64x32 (1000000000000ULL, (UINTN) TimerPeriod);

  mPerfHeader.CpuFreq = Freq;

  //
  // Record BDS raw performance data
  //
  mPerfHeader.BDSRaw = Ticker;

  //
  // Put Detailed performance data into memory
  //
  Handles = NULL;
  Status = gBS->LocateHandleBuffer (
                  AllHandles,
                  NULL,
                  NULL,
                  &NoHandles,
                  &Handles
                  );
  if (EFI_ERROR (Status)) {
    gBS->FreePages (mAcpiLowMemoryBase, 4);
    return ;
  }
  //
  // Get DXE drivers performance
  //
  for (mIndex = 0; mIndex < NoHandles; mIndex++) {
    Ticker = 0;
    LogEntryKey = 0;
    while ((LogEntryKey = GetPerformanceMeasurement (
                            LogEntryKey,
                            &Handle,
                            &Token,
                            &Module,
                            &StartTicker,
                            &EndTicker)) != 0) {
      if ((Handle == Handles[mIndex]) && (StartTicker < EndTicker)) {
        Ticker += (EndTicker - StartTicker);
      }
    }

    Duration = (UINT32) DivU64x32 (
                          Ticker,
                          (UINT32) Freq
                          );

    if (Duration > 0) {
      ZeroMem (&mPerfData, sizeof (PERF_DATA));

      GetNameFromHandle (Handles[mIndex], GaugeString);

      AsciiStrCpy (mPerfData.Token, GaugeString);
      mPerfData.Duration = Duration;

      CopyMem (Ptr, &mPerfData, sizeof (PERF_DATA));
      Ptr += sizeof (PERF_DATA);

      mPerfHeader.Count++;
      if (mPerfHeader.Count == LimitCount) {
        goto Done;
      }
    }
  }

  gBS->FreePool (Handles);

  //
  // Get inserted performance data
  //
  LogEntryKey = 0;
  while ((LogEntryKey = GetPerformanceMeasurement (
                          LogEntryKey,
                          &Handle,
                          &Token,
                          &Module,
                          &StartTicker,
                          &EndTicker)) != 0) {
    if ((Handle == NULL) && (StartTicker <= EndTicker)) {

      ZeroMem (&mPerfData, sizeof (PERF_DATA));

      AsciiStrnCpy (mPerfData.Token, Token, DXE_PERFORMANCE_STRING_SIZE);
      mPerfData.Duration = (UINT32) DivU64x32 (
                                      EndTicker - StartTicker,
                                      (UINT32) Freq
                                      );

      CopyMem (Ptr, &mPerfData, sizeof (PERF_DATA));
      Ptr += sizeof (PERF_DATA);

      mPerfHeader.Count++;
      if (mPerfHeader.Count == LimitCount) {
        goto Done;
      }
    }
  }

Done:

  ClearDebugRegisters ();

  mPerfHeader.Signiture = 0x66726550;

  //
  // Put performance data to memory
  //
  CopyMem (
    (UINT32 *) (UINT32) mAcpiLowMemoryBase,
    &mPerfHeader,
    sizeof (PERF_HEADER)
    );

  gRT->SetVariable (
        L"PerfDataMemAddr",
        &gEfiGlobalVariableGuid,
        EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
        sizeof (UINT32),
        (VOID *) &mAcpiLowMemoryBase
        );

  return ;
}