[edk2-staging/RiscV64QemuVirt PATCH V6 17/23] OvmfPkg: Add PrePiHobListPointerLib library

["Sunil V L" <sunilvl@ventanamicro.com>]

This library is required to use the PEI less design for
RISC-V qemu virt support.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Daniel Schaefer <git@danielschaefer.me>
Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
---
 OvmfPkg/Library/PrePiHobListPointerLib/PrePiHobListPointerLib.inf    | 23 +++++++
 OvmfPkg/Library/PrePiHobListPointerLib/RiscV64/PrePiHobListPointer.c | 65 ++++++++++++++++++++
 2 files changed, 88 insertions(+)

diff --git a/OvmfPkg/Library/PrePiHobListPointerLib/PrePiHobListPointerLib.inf b/OvmfPkg/Library/PrePiHobListPointerLib/PrePiHobListPointerLib.inf
new file mode 100644
index 000000000000..4105e60f59e1
--- /dev/null
+++ b/OvmfPkg/Library/PrePiHobListPointerLib/PrePiHobListPointerLib.inf
@@ -0,0 +1,23 @@
+#/** @file
+#
+#  Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#**/
+
+[Defines]
+  INF_VERSION                    = 0x0001001B
+  BASE_NAME                      = PrePiHobListPointerLib
+  FILE_GUID                      = E3FAFC60-758C-471B-A333-FE704A4C11B4
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = PrePiHobListPointerLib
+
+[Sources.RISCV64]
+  RiscV64/PrePiHobListPointer.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  OvmfPkg/OvmfPkg.dec
+  EmbeddedPkg/EmbeddedPkg.dec
+  UefiCpuPkg/UefiCpuPkg.dec
diff --git a/OvmfPkg/Library/PrePiHobListPointerLib/RiscV64/PrePiHobListPointer.c b/OvmfPkg/Library/PrePiHobListPointerLib/RiscV64/PrePiHobListPointer.c
new file mode 100644
index 000000000000..a58b7aae6bee
--- /dev/null
+++ b/OvmfPkg/Library/PrePiHobListPointerLib/RiscV64/PrePiHobListPointer.c
@@ -0,0 +1,65 @@
+/** @file
+*
+*  Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
+*  SPDX-License-Identifier: BSD-2-Clause-Patent
+*
+**/
+
+#include <PiPei.h>
+#include <Library/PrePiHobListPointerLib.h>
+#include <Library/DebugLib.h>
+#include <Library/HobLib.h>
+#include <Library/BaseRiscVSbiLib.h>
+
+/**
+  Returns the pointer to the HOB list.
+
+  This function returns the pointer to first HOB in the list.
+
+  @return The pointer to the HOB list.
+
+**/
+VOID *
+EFIAPI
+PrePeiGetHobList (
+  VOID
+  )
+{
+  EFI_RISCV_FIRMWARE_CONTEXT  *FirmwareContext;
+
+  FirmwareContext = NULL;
+  GetFirmwareContextPointer (&FirmwareContext);
+
+  if (FirmwareContext == NULL) {
+    DEBUG ((DEBUG_ERROR, "%a: Firmware Context is NULL\n", __FUNCTION__));
+    return NULL;
+  }
+
+  return (VOID *)FirmwareContext->PrePiHobList;
+}
+
+/**
+  Updates the pointer to the HOB list.
+
+  @param  HobList       Hob list pointer to store
+
+**/
+EFI_STATUS
+EFIAPI
+PrePeiSetHobList (
+  IN  VOID  *HobList
+  )
+{
+  EFI_RISCV_FIRMWARE_CONTEXT  *FirmwareContext;
+
+  FirmwareContext = NULL;
+  GetFirmwareContextPointer (&FirmwareContext);
+
+  if (FirmwareContext == NULL) {
+    DEBUG ((DEBUG_ERROR, "%a: Firmware Context is NULL\n", __FUNCTION__));
+    return EFI_NOT_READY;
+  }
+
+  FirmwareContext->PrePiHobList = HobList;
+  return EFI_SUCCESS;
+}
-- 
2.38.0