[edk2-platforms][PATCH v4 21/31] AmpereAltraPkg: Add Random Number Generator Support

["Nhi Pham" <nhi@os.amperecomputing.com>]

This change is to produce RNG protocol which is required by several
modules.

Cc: Thang Nguyen <thang@os.amperecomputing.com>
Cc: Chuong Tran <chuong@os.amperecomputing.com>
Cc: Phong Vo <phong@os.amperecomputing.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>

Signed-off-by: Nhi Pham <nhi@os.amperecomputing.com>
Reviewed-by: Leif Lindholm <leif@nuviainc.com>
---
 Silicon/Ampere/AmpereAltraPkg/AmpereAltraPkg.dsc.inc         |   5 +
 Platform/Ampere/JadePkg/Jade.fdf                             |   5 +
 Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxe.inf      |  43 +++++
 Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxe.c        | 164 ++++++++++++++++++++
 Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxe.uni      |  10 ++
 Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxeExtra.uni |   9 ++
 6 files changed, 236 insertions(+)

diff --git a/Silicon/Ampere/AmpereAltraPkg/AmpereAltraPkg.dsc.inc b/Silicon/Ampere/AmpereAltraPkg/AmpereAltraPkg.dsc.inc
index 9b33f295b2df..d25e34ffc6e7 100644
--- a/Silicon/Ampere/AmpereAltraPkg/AmpereAltraPkg.dsc.inc
+++ b/Silicon/Ampere/AmpereAltraPkg/AmpereAltraPkg.dsc.inc
@@ -688,6 +688,11 @@ [Components.common]
   MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf
   MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridgeDxe.inf
 
+  #
+  # Random Number Generator Support
+  #
+  Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxe.inf
+
   #
   # Bds
   #
diff --git a/Platform/Ampere/JadePkg/Jade.fdf b/Platform/Ampere/JadePkg/Jade.fdf
index ddfe1c945b16..d0e1967c19b2 100644
--- a/Platform/Ampere/JadePkg/Jade.fdf
+++ b/Platform/Ampere/JadePkg/Jade.fdf
@@ -306,6 +306,11 @@ [FV.FvMain]
   #
   INF Drivers/ASpeed/ASpeedGopBinPkg/ASpeedAst2500GopDxe.inf
 
+  #
+  # Random Number Generator Support
+  #
+  INF Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxe.inf
+
   #
   # UEFI application (Shell Embedded Boot Loader)
   #
diff --git a/Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxe.inf b/Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxe.inf
new file mode 100644
index 000000000000..c5f249e31090
--- /dev/null
+++ b/Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxe.inf
@@ -0,0 +1,43 @@
+## @file
+#
+# Copyright (c) 2021, Ampere Computing LLC. All rights reserved.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x0001001B
+  BASE_NAME                      = RngDxe
+  FILE_GUID                      = 4FCC006E-C740-4027-BC97-787907C8D286
+  MODULE_TYPE                    = DXE_RUNTIME_DRIVER
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = RngDriverEntry
+  MODULE_UNI_FILE                = RngDxe.uni
+
+[Sources.common]
+  RngDxe.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  Silicon/Ampere/AmpereAltraPkg/AmpereAltraPkg.dec
+
+[LibraryClasses]
+  BaseLib
+  DebugLib
+  TrngLib
+  UefiBootServicesTableLib
+  UefiDriverEntryPoint
+  UefiLib
+
+[Guids]
+  gEfiRngAlgorithmRaw                 ## SOMETIMES_PRODUCES    ## GUID        # Unique ID of the algorithm for RNG
+
+[Protocols]
+  gEfiRngProtocolGuid                ## PRODUCES
+
+[UserExtensions.TianoCore."ExtraFiles"]
+  RngDxeExtra.uni
+
+[Depex]
+  TRUE
diff --git a/Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxe.c b/Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxe.c
new file mode 100644
index 000000000000..bb8140cfeb2f
--- /dev/null
+++ b/Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxe.c
@@ -0,0 +1,164 @@
+/** @file
+
+  Copyright (c) 2021, Ampere Computing LLC. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Uefi.h>
+
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/TrngLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Protocol/Rng.h>
+
+/**
+  Returns information about the random number generation implementation.
+
+  @param[in]     This                 A pointer to the EFI_RNG_PROTOCOL instance.
+  @param[in,out] RNGAlgorithmListSize On input, the size in bytes of RNGAlgorithmList.
+                                      On output with a return code of EFI_SUCCESS, the size
+                                      in bytes of the data returned in RNGAlgorithmList. On output
+                                      with a return code of EFI_BUFFER_TOO_SMALL,
+                                      the size of RNGAlgorithmList required to obtain the list.
+  @param[out] RNGAlgorithmList        A caller-allocated memory buffer filled by the driver
+                                      with one EFI_RNG_ALGORITHM element for each supported
+                                      RNG algorithm. The list must not change across multiple
+                                      calls to the same driver. The first algorithm in the list
+                                      is the default algorithm for the driver.
+
+  @retval EFI_SUCCESS                 The RNG algorithm list was returned successfully.
+  @retval EFI_INVALID_PARAMETER       One or more of the parameters are incorrect.
+  @retval EFI_BUFFER_TOO_SMALL        The buffer RNGAlgorithmList is too small to hold the result.
+
+**/
+EFI_STATUS
+EFIAPI
+RngGetInfo (
+  IN     EFI_RNG_PROTOCOL  *This,
+  IN OUT UINTN             *RNGAlgorithmListSize,
+  OUT    EFI_RNG_ALGORITHM *RNGAlgorithmList
+  )
+{
+  if (This == NULL || RNGAlgorithmListSize == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (*RNGAlgorithmListSize < sizeof (EFI_RNG_ALGORITHM)) {
+    *RNGAlgorithmListSize = sizeof (EFI_RNG_ALGORITHM);
+    return EFI_BUFFER_TOO_SMALL;
+  }
+
+  if (RNGAlgorithmList == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  *RNGAlgorithmListSize = sizeof (EFI_RNG_ALGORITHM);
+  CopyGuid (RNGAlgorithmList, &gEfiRngAlgorithmRaw);
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Produces and returns an RNG value using either the default or specified RNG algorithm.
+
+  @param[in]  This                    A pointer to the EFI_RNG_PROTOCOL instance.
+  @param[in]  RNGAlgorithm            A pointer to the EFI_RNG_ALGORITHM that identifies the RNG
+                                      algorithm to use. May be NULL in which case the function will
+                                      use its default RNG algorithm.
+  @param[in]  RNGValueLength          The length in bytes of the memory buffer pointed to by
+                                      RNGValue. The driver shall return exactly this numbers of bytes.
+  @param[out] RNGValue                A caller-allocated memory buffer filled by the driver with the
+                                      resulting RNG value.
+
+  @retval EFI_SUCCESS                 The RNG value was returned successfully.
+  @retval EFI_UNSUPPORTED             The algorithm specified by RNGAlgorithm is not supported by
+                                      this driver.
+  @retval EFI_DEVICE_ERROR            An RNG value could not be retrieved due to a hardware or
+                                      firmware error.
+  @retval EFI_INVALID_PARAMETER       RNGValue is NULL or RNGValueLength is zero.
+
+**/
+EFI_STATUS
+EFIAPI
+RngGetRNG (
+  IN  EFI_RNG_PROTOCOL  *This,
+  IN  EFI_RNG_ALGORITHM *RNGAlgorithm, OPTIONAL
+  IN  UINTN             RNGValueLength,
+  OUT UINT8             *RNGValue
+  )
+{
+  EFI_STATUS Status;
+
+  if (This == NULL || RNGValueLength == 0 || RNGValue == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  //
+  // We only support the raw algorithm, so reject requests for anything else
+  //
+  if (RNGAlgorithm != NULL &&
+      !CompareGuid (RNGAlgorithm, &gEfiRngAlgorithmRaw))
+  {
+    return EFI_UNSUPPORTED;
+  }
+
+  Status = GenerateRandomNumbers (RNGValue, RNGValueLength);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((
+      DEBUG_ERROR,
+      "%a:%d Failed to generate a random number. \n",
+      __FUNCTION__,
+      __LINE__
+      ));
+    return Status;
+  }
+
+  return EFI_SUCCESS;
+}
+
+/*
+ * The Random Number Generator (RNG) protocol
+ */
+EFI_RNG_PROTOCOL mRng = {
+  RngGetInfo,
+  RngGetRNG
+};
+
+/**
+  The user Entry Point for the Random Number Generator (RNG) driver.
+
+  @param[in] ImageHandle    The firmware allocated handle for the EFI image.
+  @param[in] SystemTable    A pointer to the EFI System Table.
+
+  @retval EFI_SUCCESS       The entry point is executed successfully.
+  @retval EFI_NOT_SUPPORTED Platform does not support RNG.
+  @retval Other             Some error occurs when executing this entry point.
+
+**/
+EFI_STATUS
+EFIAPI
+RngDriverEntry (
+  IN EFI_HANDLE       ImageHandle,
+  IN EFI_SYSTEM_TABLE *SystemTable
+  )
+{
+  EFI_STATUS Status;
+  EFI_HANDLE Handle;
+
+  //
+  // Install UEFI RNG (Random Number Generator) Protocol
+  //
+  Handle = NULL;
+  Status = gBS->InstallMultipleProtocolInterfaces (
+                  &Handle,
+                  &gEfiRngProtocolGuid,
+                  &mRng,
+                  NULL
+                  );
+
+  return Status;
+}
diff --git a/Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxe.uni b/Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxe.uni
new file mode 100644
index 000000000000..cd9dde97a236
--- /dev/null
+++ b/Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxe.uni
@@ -0,0 +1,10 @@
+//
+// Copyright (c) 2021, Ampere Computing LLC. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+
+
+#string STR_MODULE_ABSTRACT             #language en-US "Produces UEFI Random Number Generator protocol"
+
+#string STR_MODULE_DESCRIPTION          #language en-US "This module will produce UEFI Random Number Generator protocol."
diff --git a/Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxeExtra.uni b/Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxeExtra.uni
new file mode 100644
index 000000000000..9a3696b25442
--- /dev/null
+++ b/Silicon/Ampere/AmpereAltraPkg/Drivers/RngDxe/RngDxeExtra.uni
@@ -0,0 +1,9 @@
+//
+// Copyright (c) 2021, Ampere Computing LLC. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+
+#string STR_PROPERTIES_MODULE_NAME
+#language en-US
+"Ampere UEFI Random Number Generator DXE"
-- 
2.17.1