ArmAlgo.c

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#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/ArmTrngLib.h>
 
#include "RngDxeInternals.h"
 
// Maximum number of Rng algorithms.
#define RNG_AVAILABLE_ALGO_MAX  1
 
EFI_STATUS
EFIAPI
GetAvailableAlgorithms (
  VOID
  )
{
  UINT16  MajorRevision;
  UINT16  MinorRevision;
 
  // Rng algorithms 2 times, one for the allocation, one to populate.
  mAvailableAlgoArray = AllocateZeroPool (RNG_AVAILABLE_ALGO_MAX * sizeof (EFI_RNG_ALGORITHM));
  if (mAvailableAlgoArray == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }
 
  // Raw algorithm (Trng)
  if (!EFI_ERROR (GetArmTrngVersion (&MajorRevision, &MinorRevision))) {
    CopyMem (
      &mAvailableAlgoArray[mAvailableAlgoArrayCount],
      &gEfiRngAlgorithmRaw,
      sizeof (EFI_RNG_ALGORITHM)
      );
    mAvailableAlgoArrayCount++;
  }
 
  return EFI_SUCCESS;
}