VerifyMemOpt.c

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#include <Uefi.h>
#include <Library/BaseMemoryLib.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/OcMiscLib.h>
#include <Library/UefiLib.h>
#include <Library/UefiBootServicesTableLib.h>
 
STATIC UINT8  mSource[64];
STATIC UINT8  mDestination[64];
 
EFI_STATUS
EFIAPI
UefiMain (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  UINT8          *Src;
  UINT8          *Dst;
  UINT32         Size;
  IA32_CR0       Cr0;
  IA32_CR4       Cr4;
  IA32_EFLAGS32  Flags;
 
  Src  = ALIGN_POINTER (mSource, 16);
  Dst  = ALIGN_POINTER (mDestination, 16);
  Size = 32;
 
  gST->ConOut->OutputString (gST->ConOut, L"VerifyMemOpt\r\n");
  gBS->Stall (SECONDS_TO_MICROSECONDS (1));
 
  Cr0.UintN   = AsmReadCr0 ();
  Cr4.UintN   = AsmReadCr4 ();
  Flags.UintN = AsmReadEflags ();
 
  //
  // CR0.MP         bit (BIT1)   must be set.
  // CR0.EM         bit (BIT2)   must be cleared.
  // CR4.OSFXSR     bit (BIT9)   must be set.
  // CR4.OSXMMEXCPT bit (BIT10)  must be set.
  //
  DEBUG ((DEBUG_WARN, "VMOPT: CR0 %08X CR4 %08X EFLAGS %08X\n", Cr0, Cr4, Flags));
 
  if (Cr0.Bits.MP == 0) {
    DEBUG ((DEBUG_WARN, "VMOPT: WARN CR0 MP is NOT set\n"));
  }
 
  if (Cr0.Bits.EM != 0) {
    DEBUG ((DEBUG_WARN, "VMOPT: WARN CR0 EM is set\n"));
  }
 
  if (Cr4.Bits.OSFXSR == 0) {
    DEBUG ((DEBUG_WARN, "VMOPT: WARN CR4 OSFXSR is NOT set\n"));
  }
 
  if (Cr4.Bits.OSXMMEXCPT == 0) {
    DEBUG ((DEBUG_WARN, "VMOPT: WARN CR4 OSXMMEXCPT is NOT set\n"));
  }
 
  if (Flags.Bits.DF != 0) {
    DEBUG ((DEBUG_WARN, "VMOPT: WARN EFLAGS DF is set\n"));
  }
 
  DEBUG ((DEBUG_WARN, "VMOPT: CopyMem aligned src %p/aligned dst %p/size %u\n", Src, Dst, Size));
  gBS->Stall (SECONDS_TO_MICROSECONDS (1));
  CopyMem (Dst, Src, Size);
 
  Src += 6;
  DEBUG ((DEBUG_WARN, "VMOPT: CopyMem unaligned src %p/aligned dst %p/size %u\n", Src, Dst, Size));
  gBS->Stall (SECONDS_TO_MICROSECONDS (1));
  CopyMem (Dst, Src, Size);
 
  Size -= 12;
  DEBUG ((DEBUG_WARN, "VMOPT: CopyMem unaligned src %p/aligned dst %p/size %u\n", Src, Dst, Size));
  gBS->Stall (SECONDS_TO_MICROSECONDS (1));
  CopyMem (Dst, Src, Size);
 
  Dst += 6;
  DEBUG ((DEBUG_WARN, "VMOPT: CopyMem unaligned src %p/unaligned dst %p/size %u\n", Src, Dst, Size));
  gBS->Stall (SECONDS_TO_MICROSECONDS (1));
  CopyMem (Dst, Src, Size);
 
  DEBUG ((DEBUG_WARN, "VMOPT: Done testing\n"));
  gBS->Stall (SECONDS_TO_MICROSECONDS (1));
 
  return EFI_SUCCESS;
}