1 files changed, 120 insertions, 0 deletions
diff --git a/SamsungPlatformPkg/ExynosPkg/Exynos5250/Drivers/RngDxe/RngDxe.c b/SamsungPlatformPkg/ExynosPkg/Exynos5250/Drivers/RngDxe/RngDxe.c
new file mode 100644
index 000000000..7254bd1fa
--- /dev/null
+++ b/SamsungPlatformPkg/ExynosPkg/Exynos5250/Drivers/RngDxe/RngDxe.c
@@ -0,0 +1,120 @@
+/** @file
+  Implement EFI Random Number Generator runtime services via Rng Lib.
+  
+  Copyright (c) 2008 - 2009, Apple Inc. 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 <Uefi.h>
+
+#include <Library/IoLib.h>
+#include <Library/PcdLib.h>
+#include <Library/DebugLib.h>
+#include <Library/ArmGicLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+
+#include <Protocol/ExynosRng.h>
+
+#include "RngDxe.h"
+
+#define CLKDIV		512
+#define RNGSEL		5
+
+/**
+ * Generates a pseudorandom byte stream of the specified size.
+ *
+ * If Output is NULL, then return FALSE.
+ *
+ * @param[out]  Output		Pointer to buffer to receive random value
+ * @param[in]	Size		Size of random bytes to generate
+ *
+ * @retval  TRUE	Pseudorandom byte stream generated successfully.
+ * @retval  FALSE	Pseudorandom number generator fails to generate due to lack of entropy.
+ *
+ **/
+EFI_STATUS
+EFIAPI
+RngDxeRandomBytes (
+  IN CONST EFI_RNG_PROTOCOL	*This,
+  OUT UINT8			*Output,
+  IN UINTN			Size
+  )
+{
+  EFI_STATUS Status = EFI_SUCCESS;
+  UINT32	TRNGBase;
+  UINT32	value, count, fifo_addr;
+
+  TRNGBase = PcdGet32(PcdCryptoBase);
+
+  /* Set Clock Divider */
+  MmioWrite32(TRNGBase + TRNG_CLKDIV, CLKDIV);
+
+  /* Select RNG Engine */
+  value = TRNG_ENABLE | TRNG_MANUAL_ENABLE | RNGSEL;
+  MmioWrite32(TRNGBase + TRNG_CTRL, value);
+
+  /* Select and Enable Post Processor */
+  value = TRNG_POST_ENABLE | TRNG_POST_SEL_LFSR;
+  MmioWrite32(TRNGBase + TRNG_POST_CTRL, value);
+
+  /* Disable Online Tester */
+  MmioWrite32(TRNGBase + TRNG_ONLINE_CTRL, 0);
+
+  /* Set FIFO pointer as number of random bits */
+  MmioWrite32(TRNGBase + TRNG_FIFO_CTRL, Size << 3);
+
+  /* Poll FIFO pointer until TRNG_FIFO_CTRL.FIFOPTR == 0 */
+  while (MmioRead32(TRNGBase + TRNG_FIFO_CTRL));
+
+  /* Read TRNG FIFO */
+  for (count = 0; count < (Size >> 2); count++) {
+	  fifo_addr = TRNG_FIFO_0 + (count << 2);
+	  value = MmioRead32(TRNGBase + fifo_addr);
+	  CopyMem((UINT8 *)((UINT32)Output + (count << 2)), &value, sizeof(value));
+  }
+
+  return Status;
+}
+
+EFI_RNG_PROTOCOL gRng = {
+	RngDxeRandomBytes
+};
+
+/**
+  Initialize the state information for the RngDxe
+
+  @param  ImageHandle   of the loaded driver
+  @param  SystemTable   Pointer to the System Table
+
+  @retval EFI_SUCCESS           Protocol registered
+  @retval EFI_OUT_OF_RESOURCES  Cannot allocate protocol data structure
+  @retval EFI_DEVICE_ERROR      Hardware problems
+
+**/
+EFI_STATUS
+EFIAPI
+RngDxeInitialize (
+  IN EFI_HANDLE         ImageHandle,
+  IN EFI_SYSTEM_TABLE   *SystemTable
+  )
+{
+	EFI_STATUS Status = EFI_SUCCESS;
+
+	Status = gBS->InstallMultipleProtocolInterfaces(
+			&ImageHandle,
+			&gSamsungPlatformRngProtocolGuid,
+			&gRng,
+			NULL
+			);
+
+	return Status;
+}