Add applications for hidden BIOS settings lesson

Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>

11 files changed, 707 insertions, 0 deletions

diff --git a/UefiLessonsPkg/HiddenSettings/Data.h b/UefiLessonsPkg/HiddenSettings/Data.h
new file mode 100644
index 0000000..171e406
--- /dev/null
+++ b/UefiLessonsPkg/HiddenSettings/Data.h
@@ -0,0 +1,17 @@
+#ifndef _DATA_H_
+#define _DATA_H_
+
+#define FORMSET_GUID  {0x98259761, 0x6b0b, 0x4531, {0xa7, 0x4b, 0x67, 0xaf, 0x5d, 0x8a, 0x81, 0x53}}
+#define DATAPATH_GUID {0x3f3d5b97, 0x48e8, 0x4f4a, {0x85, 0x1e, 0x82, 0xe6, 0x50, 0x93, 0x0a, 0xeb}}
+#define STORAGE_GUID  {0x3f5996a7, 0x8b56, 0x472c, {0x95, 0x38, 0x47, 0x5f, 0x77, 0x15, 0x7c, 0x84}}
+#define STORAGE_EFI_GUID  {0x01539e15, 0x2a73, 0x4aaf, {0x9d, 0x3e, 0x43, 0x7b, 0xfa, 0xbb, 0x46, 0x66}}
+
+#pragma pack(1)
+typedef struct {
+  UINT8 CheckboxValue;
+  UINT16 NumericValue;
+  UINT8 OneOfValue;
+} VARIABLE_STRUCTURE;
+#pragma pack()
+
+#endif
diff --git a/UefiLessonsPkg/HiddenSettings/Form.vfr b/UefiLessonsPkg/HiddenSettings/Form.vfr
new file mode 100644
index 0000000..1aafddc
--- /dev/null
+++ b/UefiLessonsPkg/HiddenSettings/Form.vfr
@@ -0,0 +1,93 @@
+#include <Uefi/UefiMultiPhase.h>
+#include "Data.h"
+
+formset
+  guid     = FORMSET_GUID,
+  title    = STRING_TOKEN(FORMSET_TITLE),
+  help     = STRING_TOKEN(FORMSET_HELP),
+
+  varstore VARIABLE_STRUCTURE,
+    name  = FormData,
+    guid  = STORAGE_GUID;
+
+  efivarstore VARIABLE_STRUCTURE,
+    attribute = EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_NON_VOLATILE,
+    name  = FormEfiData,
+    guid  = STORAGE_EFI_GUID;
+
+  defaultstore StandardDefault,
+    prompt      = STRING_TOKEN(STANDARD_DEFAULT_PROMPT),
+    attribute   = 0x0000;
+
+  form
+    formid = 1,
+    title = STRING_TOKEN(FORMID1_TITLE);
+
+suppressif TRUE;
+    checkbox
+      varid = FormData.CheckboxValue,
+      prompt = STRING_TOKEN(CHECKBOX_PROMPT),
+      help = STRING_TOKEN(CHECKBOX_HELP),
+      default = FALSE, defaultstore = StandardDefault,
+    endcheckbox;
+endif;
+
+suppressif ideqval FormData.CheckboxValue == 0;
+    numeric
+      name = NumericQuestion,
+      varid = FormData.NumericValue,
+      prompt = STRING_TOKEN(NUMERIC_PROMPT),
+      help = STRING_TOKEN(NUMERIC_HELP),
+      flags = NUMERIC_SIZE_2 | DISPLAY_UINT_HEX,
+      minimum = 0,
+      maximum = 10,
+      step = 1,
+      default = 5, defaultstore = StandardDefault,
+    endnumeric;
+
+    oneof
+      name = OneOfQuestion,
+      varid = FormData.OneOfValue,
+      prompt = STRING_TOKEN(ONEOF_PROMPT),
+      help = STRING_TOKEN(ONEOF_HELP),
+      option text = STRING_TOKEN(ONEOF_OPTION1), value = 0x00, flags = 0;
+      option text = STRING_TOKEN(ONEOF_OPTION2), value = 0x33, flags = DEFAULT;
+      option text = STRING_TOKEN(ONEOF_OPTION3), value = 0x55, flags = 0;
+    endoneof;
+endif;
+
+grayoutif TRUE;
+    checkbox
+      varid = FormEfiData.CheckboxValue,
+      prompt = STRING_TOKEN(CHECKBOX_EFI_PROMPT),
+      help = STRING_TOKEN(CHECKBOX_EFI_HELP),
+      default = FALSE, defaultstore = StandardDefault,
+    endcheckbox;
+endif;
+
+grayoutif ideqval FormEfiData.CheckboxValue == 0;
+    numeric
+      name = NumericEfiQuestion,
+      varid = FormEfiData.NumericValue,
+      prompt = STRING_TOKEN(NUMERIC_EFI_PROMPT),
+      help = STRING_TOKEN(NUMERIC_EFI_HELP),
+      flags = NUMERIC_SIZE_2 | DISPLAY_UINT_HEX,
+      minimum = 0,
+      maximum = 10,
+      step = 1,
+      default = 6, defaultstore = StandardDefault,
+    endnumeric;
+
+    oneof
+      name = OneOfEfiQuestion,
+      varid = FormEfiData.OneOfValue,
+      prompt = STRING_TOKEN(ONEOF_EFI_PROMPT),
+      help = STRING_TOKEN(ONEOF_EFI_HELP),
+      option text = STRING_TOKEN(ONEOF_OPTION1), value = 0x00, flags = 0;
+      option text = STRING_TOKEN(ONEOF_OPTION2), value = 0x33, flags = 0;
+      option text = STRING_TOKEN(ONEOF_OPTION3), value = 0x55, flags = DEFAULT;
+    endoneof;
+endif;
+
+  endform;
+endformset;
diff --git a/UefiLessonsPkg/HiddenSettings/HiddenSettings.c b/UefiLessonsPkg/HiddenSettings/HiddenSettings.c
new file mode 100644
index 0000000..58a23d4
--- /dev/null
+++ b/UefiLessonsPkg/HiddenSettings/HiddenSettings.c
@@ -0,0 +1,267 @@
+/*
+ * Copyright (c) 2024, Konstantin Aladyshev <aladyshev22@gmail.com>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <Library/BaseMemoryLib.h>
+#include <Library/DevicePathLib.h>
+#include <Library/HiiLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/PrintLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiHiiServicesLib.h>
+#include <Library/UefiLib.h>
+#include <Library/UefiRuntimeServicesTableLib.h>
+#include <Protocol/HiiConfigAccess.h>
+#include "Data.h"
+
+extern UINT8 FormBin[];
+
+#pragma pack(1)
+typedef struct {
+  VENDOR_DEVICE_PATH             VendorDevicePath;
+  EFI_DEVICE_PATH_PROTOCOL       End;
+} HII_VENDOR_DEVICE_PATH;
+#pragma pack()
+
+HII_VENDOR_DEVICE_PATH  mHiiVendorDevicePath = {
+  {
+    {
+      HARDWARE_DEVICE_PATH,
+      HW_VENDOR_DP,
+      {
+        (UINT8) (sizeof (VENDOR_DEVICE_PATH)),
+        (UINT8) ((sizeof (VENDOR_DEVICE_PATH)) >> 8)
+      }
+    },
+    DATAPATH_GUID
+  },
+  {
+    END_DEVICE_PATH_TYPE,
+    END_ENTIRE_DEVICE_PATH_SUBTYPE,
+    {
+      (UINT8) (END_DEVICE_PATH_LENGTH),
+      (UINT8) ((END_DEVICE_PATH_LENGTH) >> 8)
+    }
+  }
+};
+
+EFI_HII_HANDLE  mHiiHandle = NULL;
+EFI_HANDLE      mDriverHandle = NULL;
+EFI_HII_CONFIG_ACCESS_PROTOCOL mConfigAccess;
+EFI_GUID StorageGuid = STORAGE_GUID;
+EFI_STRING StorageName = L"FormData";
+
+VARIABLE_STRUCTURE FormStorage;
+
+STATIC
+EFI_STATUS
+EFIAPI
+ExtractConfig (
+  IN CONST  EFI_HII_CONFIG_ACCESS_PROTOCOL  *This,
+  IN CONST  EFI_STRING                      Request,
+  OUT       EFI_STRING                      *Progress,
+  OUT       EFI_STRING                      *Results
+)
+{
+  BOOLEAN AllocatedRequest = FALSE;
+
+  if (Progress == NULL || Results == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if ((Request != NULL) && !HiiIsConfigHdrMatch(Request, &StorageGuid, StorageName)) {
+    return EFI_NOT_FOUND;
+  }
+
+  EFI_STRING ConfigRequest = Request;
+  if ((Request == NULL) || (StrStr (Request, L"OFFSET") == NULL)) {
+    EFI_STRING ConfigRequestHdr = HiiConstructConfigHdr(&StorageGuid, StorageName, mDriverHandle);
+    UINTN Size = (StrLen(ConfigRequestHdr) + StrLen(L"&OFFSET=0&WIDTH=") + sizeof(UINTN)*2 + 1) * sizeof(CHAR16);
+    ConfigRequest = AllocateZeroPool(Size);
+    AllocatedRequest = TRUE;
+    UnicodeSPrint(ConfigRequest, Size, L"%s&OFFSET=0&WIDTH=%016LX", ConfigRequestHdr, sizeof(VARIABLE_STRUCTURE));
+    FreePool(ConfigRequestHdr);
+  }
+  EFI_STATUS Status = gHiiConfigRouting->BlockToConfig(gHiiConfigRouting,
+                                                       ConfigRequest,
+                                                       (UINT8*)&FormStorage,
+                                                       sizeof(VARIABLE_STRUCTURE),
+                                                       Results,
+                                                       Progress);
+
+  if (AllocatedRequest) {
+    FreePool(ConfigRequest);
+    if (Request == NULL) {
+      *Progress = NULL;
+    } else if (StrStr(Request, L"OFFSET") == NULL) {
+      *Progress = Request + StrLen(Request);
+    }
+  }
+
+  return Status;
+}
+
+STATIC
+EFI_STATUS
+EFIAPI
+RouteConfig (
+  IN CONST  EFI_HII_CONFIG_ACCESS_PROTOCOL  *This,
+  IN CONST  EFI_STRING                      Configuration,
+  OUT       EFI_STRING                      *Progress
+)
+{
+  if (Configuration == NULL || Progress == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  UINTN BlockSize = sizeof(VARIABLE_STRUCTURE);
+  EFI_STATUS Status = gHiiConfigRouting->ConfigToBlock(gHiiConfigRouting,
+                                                       Configuration,
+                                                       (UINT8*)&FormStorage,
+                                                       &BlockSize,
+                                                       Progress);
+
+  return Status;
+}
+
+STATIC
+EFI_STATUS
+EFIAPI
+Callback (
+  IN     CONST EFI_HII_CONFIG_ACCESS_PROTOCOL   *This,
+  IN     EFI_BROWSER_ACTION                     Action,
+  IN     EFI_QUESTION_ID                        QuestionId,
+  IN     UINT8                                  Type,
+  IN OUT EFI_IFR_TYPE_VALUE                     *Value,
+  OUT    EFI_BROWSER_ACTION_REQUEST             *ActionRequest
+  )
+{
+  return EFI_UNSUPPORTED;
+}
+
+EFI_STATUS
+EFIAPI
+HiddenSettingsUnload (
+  EFI_HANDLE ImageHandle
+  )
+{
+  if (mHiiHandle != NULL)
+    HiiRemovePackages(mHiiHandle);
+
+
+  EFI_STATUS Status = gBS->UninstallMultipleProtocolInterfaces(
+                             mDriverHandle,
+                             &gEfiDevicePathProtocolGuid,
+                             &mHiiVendorDevicePath,
+                             &gEfiHiiConfigAccessProtocolGuid,
+                             &mConfigAccess,
+                             NULL);
+
+  UINTN BufferSize;
+  VARIABLE_STRUCTURE EfiVarstore;
+  BufferSize = sizeof(VARIABLE_STRUCTURE);
+  EFI_GUID EfiVarGuid = STORAGE_EFI_GUID;
+  Status = gRT->GetVariable(
+                L"FormEfiData",
+                &EfiVarGuid,
+                NULL,
+                &BufferSize,
+                &EfiVarstore);
+  if (!EFI_ERROR(Status)) {
+    Status = gRT->SetVariable(
+                  L"FormEfiData",
+                  &EfiVarGuid,
+                  0,
+                  0,
+                  NULL);
+    if (EFI_ERROR(Status)) {
+      Print(L"Error! Can't delete variable! %r\n", Status);
+    }
+  }
+
+  return Status;
+}
+
+EFI_STATUS
+EFIAPI
+HiddenSettingsEntryPoint (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  mConfigAccess.ExtractConfig = &ExtractConfig;
+  mConfigAccess.RouteConfig   = &RouteConfig;
+  mConfigAccess.Callback      = &Callback;
+
+  EFI_STATUS Status;
+  Status = gBS->InstallMultipleProtocolInterfaces(
+                  &mDriverHandle,
+                  &gEfiDevicePathProtocolGuid,
+                  &mHiiVendorDevicePath,
+                  &gEfiHiiConfigAccessProtocolGuid,
+                  &mConfigAccess,
+                  NULL
+                  );
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  mHiiHandle = HiiAddPackages(
+                 &gEfiCallerIdGuid,
+                 mDriverHandle,
+                 HiddenSettingsStrings,
+                 FormBin,
+                 NULL
+                 );
+  if (mHiiHandle == NULL) {
+    gBS->UninstallMultipleProtocolInterfaces(
+           mDriverHandle,
+           &gEfiDevicePathProtocolGuid,
+           &mHiiVendorDevicePath,
+           &gEfiHiiConfigAccessProtocolGuid,
+           &mConfigAccess,
+           NULL);
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  EFI_STRING ConfigStr;
+  UINT16 DefaultId = 0;
+
+  UINTN BufferSize;
+  VARIABLE_STRUCTURE EfiVarstore;
+  BufferSize = sizeof(VARIABLE_STRUCTURE);
+  EFI_GUID EfiVarGuid = STORAGE_EFI_GUID;
+  Status = gRT->GetVariable (
+                L"FormEfiData",
+                &EfiVarGuid,
+                NULL,
+                &BufferSize,
+                &EfiVarstore);
+  if (EFI_ERROR(Status)) {
+    ZeroMem(&EfiVarstore, sizeof(EfiVarstore));
+    Status = gRT->SetVariable(
+                  L"FormEfiData",
+                  &EfiVarGuid,
+                  EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS,
+                  sizeof(EfiVarstore),
+                  &EfiVarstore);
+    if (EFI_ERROR(Status)) {
+      Print(L"Error! Can't create variable! %r\n", Status);
+    }
+
+    ConfigStr = HiiConstructConfigHdr(&EfiVarGuid, L"FormEfiData", mDriverHandle);
+    UINT16 DefaultId = 0;
+    if (!HiiSetToDefaults(ConfigStr, DefaultId)) {
+      Print(L"Error! Can't set default configuration #%d\n", DefaultId);
+    }
+  }
+
+  ConfigStr = HiiConstructConfigHdr(&StorageGuid, L"FormData", mDriverHandle);
+  if (!HiiSetToDefaults(ConfigStr, DefaultId)) {
+    Print(L"Error! Can't set default configuration #%d\n", DefaultId);
+  }
+
+  return EFI_SUCCESS;
+}
diff --git a/UefiLessonsPkg/HiddenSettings/HiddenSettings.inf b/UefiLessonsPkg/HiddenSettings/HiddenSettings.inf
new file mode 100644
index 0000000..731f245
--- /dev/null
+++ b/UefiLessonsPkg/HiddenSettings/HiddenSettings.inf
@@ -0,0 +1,32 @@
+##
+# Copyright (c) 2024, Konstantin Aladyshev <aladyshev22@gmail.com>
+#
+# SPDX-License-Identifier: MIT
+##
+
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = HiddenSettings
+  FILE_GUID                      = 269d7962-badc-44da-815a-4af4f293f3e0
+  MODULE_TYPE                    = UEFI_DRIVER
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = HiddenSettingsEntryPoint
+  UNLOAD_IMAGE                   = HiddenSettingsUnload
+
+[Sources]
+  HiddenSettings.c
+  Strings.uni
+  Form.vfr
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+
+[LibraryClasses]
+  UefiDriverEntryPoint
+  UefiLib
+  UefiHiiServicesLib
+  HiiLib
+
+[Protocols]
+  gEfiHiiConfigAccessProtocolGuid
diff --git a/UefiLessonsPkg/HiddenSettings/Strings.uni b/UefiLessonsPkg/HiddenSettings/Strings.uni
new file mode 100644
index 0000000..acca471
--- /dev/null
+++ b/UefiLessonsPkg/HiddenSettings/Strings.uni
@@ -0,0 +1,28 @@
+//
+// Copyright (c) 2024, Konstantin Aladyshev <aladyshev22@gmail.com>
+//
+// SPDX-License-Identifier: MIT
+//
+
+#langdef en-US "English"
+
+#string FORMSET_TITLE            #language en-US  "Formset with hidden settings"
+#string FORMSET_HELP             #language en-US  "Formset with hidden settings"
+#string FORMID1_TITLE            #language en-US  "Form with hidden settings"
+#string CHECKBOX_PROMPT          #language en-US  "Show varstore settings"
+#string CHECKBOX_HELP            #language en-US  "Show varstore settings"
+#string NUMERIC_PROMPT           #language en-US  "Numeric prompt"
+#string NUMERIC_HELP             #language en-US  "Numeric help"
+#string ONEOF_PROMPT             #language en-US  "OneOf list prompt"
+#string ONEOF_HELP               #language en-US  "OneOf list help"
+#string ONEOF_OPTION1            #language en-US  "OneOf list option 1"
+#string ONEOF_OPTION2            #language en-US  "OneOf list option 2"
+#string ONEOF_OPTION3            #language en-US  "OneOf list option 3"
+#string STRING_DEFAULT           #language en-US  "String default"
+#string CHECKBOX_EFI_PROMPT      #language en-US  "Enable efivarstorage settings"
+#string CHECKBOX_EFI_HELP        #language en-US  "Enable efivarstorage settings"
+#string NUMERIC_EFI_PROMPT       #language en-US  "Numeric EFI prompt"
+#string NUMERIC_EFI_HELP         #language en-US  "Numeric EFI help"
+#string ONEOF_EFI_PROMPT         #language en-US  "OneOf list EFI prompt"
+#string ONEOF_EFI_HELP           #language en-US  "OneOf list EFI help"
+#string STANDARD_DEFAULT_PROMPT  #language en-US  "Standard default"
diff --git a/UefiLessonsPkg/ShowHIIext/ShowHIIext.c b/UefiLessonsPkg/ShowHIIext/ShowHIIext.c
new file mode 100644
index 0000000..5bbb9a8
--- /dev/null
+++ b/UefiLessonsPkg/ShowHIIext/ShowHIIext.c
@@ -0,0 +1,216 @@
+/*
+ * Copyright (c) 2024, Konstantin Aladyshev <aladyshev22@gmail.com>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+#include <Protocol/HiiDatabase.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/ShellLib.h>
+#include <Library/PrintLib.h>
+#include <Library/HiiLib.h>
+
+GLOBAL_REMOVE_IF_UNREFERENCED EFI_STRING_ID mStringHelpTokenId = STRING_TOKEN(STR_HELP);
+
+BOOLEAN savePackageLists = FALSE;
+UINTN savePackageIndex = 0xffffffff; // ALL
+
+EFI_STATUS WriteFile(CHAR16* FileName, VOID* Data, UINTN* Size)
+{
+  SHELL_FILE_HANDLE FileHandle;
+  EFI_STATUS Status = ShellOpenFileByName(
+    FileName,
+    &FileHandle,
+    EFI_FILE_MODE_CREATE | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_READ,
+    0
+  );
+  if (!EFI_ERROR(Status)) {
+    Print(L"Save file as %s\n", FileName);
+    UINTN ToWrite = *Size;
+    Status = ShellWriteFile(
+      FileHandle,
+      Size,
+      Data
+    );
+    if (EFI_ERROR(Status)) {
+      Print(L"Can't write file: %r\n", Status);
+    }
+    if (*Size != ToWrite) {
+      Print(L"Error! Not all data was written\n");
+    }
+    Status = ShellCloseFile(
+      &FileHandle
+    );
+    if (EFI_ERROR(Status)) {
+      Print(L"Can't close file: %r\n", Status);
+    }
+  } else {
+    Print(L"Can't open file: %r\n", Status);
+  }
+  return Status;
+}
+
+CHAR16* PackageType(UINTN Type)
+{
+  switch(Type) {
+    case EFI_HII_PACKAGE_TYPE_ALL:
+      return L"ALL";
+    case EFI_HII_PACKAGE_TYPE_GUID:
+      return L"GUID";
+    case EFI_HII_PACKAGE_FORMS:
+      return L"FORMS";
+    case EFI_HII_PACKAGE_STRINGS:
+      return L"STRINGS";
+    case EFI_HII_PACKAGE_FONTS:
+      return L"FONTS";
+    case EFI_HII_PACKAGE_IMAGES:
+      return L"IMAGES";
+    case EFI_HII_PACKAGE_SIMPLE_FONTS:
+      return L"SIMPLE_FONTS";
+    case EFI_HII_PACKAGE_DEVICE_PATH:
+      return L"DEVICE_PATH";
+    case EFI_HII_PACKAGE_KEYBOARD_LAYOUT:
+      return L"KEYBOARD_LAYOUT";
+    case EFI_HII_PACKAGE_ANIMATIONS:
+      return L"ANIMATIONS";
+    case EFI_HII_PACKAGE_END:
+      return L"END";
+    case EFI_HII_PACKAGE_TYPE_SYSTEM_BEGIN:
+      return L"SYSTEM_BEGIN";
+    case EFI_HII_PACKAGE_TYPE_SYSTEM_END:
+      return L"SYSTEM_END";
+  }
+  return L"UNKNOWN";
+}
+
+VOID ParseHiiPackageLists(EFI_HII_PACKAGE_LIST_HEADER* HiiDatabase, UINTN HiiDatabaseSize)
+{
+  EFI_HII_PACKAGE_LIST_HEADER* HiiPackageListHeader;
+  HiiPackageListHeader = (EFI_HII_PACKAGE_LIST_HEADER*) HiiDatabase;
+
+  UINTN i=0;
+  while ((UINTN) HiiPackageListHeader < ((UINTN) HiiDatabase + HiiDatabaseSize)) {
+    UINTN HiiPackageListSize = HiiPackageListHeader->PackageLength;
+    if (HiiPackageListSize == 0)
+      break;
+    if (savePackageLists) {
+      if ((savePackageIndex == 0xFFFFFFFF) || (savePackageIndex == i)) {
+        CHAR16 FileName[100];
+        UnicodeSPrint(FileName, 100, L"%04d_%g", i, HiiPackageListHeader->PackageListGuid);
+        UINTN ToWrite = HiiPackageListSize;
+        EFI_STATUS Status = WriteFile(FileName, HiiPackageListHeader, &ToWrite);
+        if (EFI_ERROR(Status)) {
+          Print(L"Error! Failed to write PackageList %d\n", i);
+        }
+      }
+    }
+    if (!savePackageLists)
+      Print(L"PackageList[%d]: GUID=%g; size=0x%X\n", i, HiiPackageListHeader->PackageListGuid, HiiPackageListHeader->PackageLength);
+    i++;
+
+    EFI_HII_PACKAGE_HEADER* HiiPackageHeader = (EFI_HII_PACKAGE_HEADER*)((UINTN) HiiPackageListHeader + sizeof(EFI_HII_PACKAGE_LIST_HEADER));
+    UINTN j=0;
+    while ((UINTN) HiiPackageHeader < ((UINTN) HiiPackageListHeader + HiiPackageListSize)) {
+      if (!savePackageLists)
+        Print(L"\tPackage[%d]: type=%s; size=0x%X\n", j++, PackageType(HiiPackageHeader->Type), HiiPackageHeader->Length);
+
+      // Go to next Package
+      HiiPackageHeader = (EFI_HII_PACKAGE_HEADER*)((UINTN) HiiPackageHeader + HiiPackageHeader->Length);
+    }
+
+    // Go to next PackageList
+    HiiPackageListHeader = (EFI_HII_PACKAGE_LIST_HEADER*)((UINTN) HiiPackageListHeader + HiiPackageListSize);
+  }
+}
+
+VOID Usage()
+{
+  CHAR16 HelpStr[100];
+  UnicodeSPrint(HelpStr, 100, L"%a", gEfiCallerBaseName);
+  ShellPrintHelp(HelpStr, NULL, FALSE);
+}
+
+INTN EFIAPI ShellAppMain(IN UINTN Argc, IN CHAR16 **Argv)
+{
+  EFI_STATUS Status;
+
+  UINTN bOptionIndex = Argc;
+  UINTN hOptionIndex = Argc;
+  for (UINTN i = 1; i < Argc; i++) {
+    if (!StrCmp(Argv[i], L"-b")) {
+      ShellSetPageBreakMode(TRUE);
+      bOptionIndex = i;
+    } else if (!StrCmp(Argv[i], L"-?")) {
+      hOptionIndex = i;
+    }
+  }
+
+  for (UINTN i = 1; i < Argc; i++) {
+    if ((i == bOptionIndex) || (i == hOptionIndex))
+      continue;
+    if (!StrCmp(Argv[i], L"save")) {
+      savePackageLists = TRUE;
+      if (((i + 1) < Argc) && ((i + 1) != bOptionIndex) && ((i + 1) != hOptionIndex)) {
+        CHAR16* EndPointer;
+        Status = StrDecimalToUintnS(Argv[i + 1], &EndPointer, &savePackageIndex);
+        if (EFI_ERROR(Status) || (EndPointer == Argv[i + 1])) {
+          Usage();
+          return EFI_INVALID_PARAMETER;
+        }
+        i += 1;
+      }
+    } else {
+      Usage();
+      return EFI_INVALID_PARAMETER;
+    }
+  }
+
+  EFI_HII_DATABASE_PROTOCOL* HiiDbProtocol;
+  Status = gBS->LocateProtocol(&gEfiHiiDatabaseProtocolGuid,
+                               NULL,
+                               (VOID**)&HiiDbProtocol);
+  if (EFI_ERROR(Status)) {
+    Print(L"ERROR: Could not find HII Database protocol: %r\n", Status);
+    return Status;
+  }
+
+  UINTN PackageListSize = 0;
+  EFI_HII_PACKAGE_LIST_HEADER* PackageList = NULL;
+
+  Status = HiiDbProtocol->ExportPackageLists(HiiDbProtocol,
+                                             NULL,		// All package lists
+                                             &PackageListSize,
+                                             PackageList);
+  if (Status != EFI_BUFFER_TOO_SMALL) {
+    Print(L"ERROR: Could not obtain package list size\n");
+    return Status;
+  }
+
+  Status = gBS->AllocatePool(EfiBootServicesData,
+                             PackageListSize,
+                             (VOID**)&PackageList);
+  if (EFI_ERROR(Status)) {
+    Print(L"ERROR: Could not allocate sufficient memory for package list: %r\n", Status);
+    return Status;
+  }
+
+
+  Status = HiiDbProtocol->ExportPackageLists(HiiDbProtocol,
+                                             NULL,
+                                             &PackageListSize,
+                                             PackageList);
+  if (EFI_ERROR(Status)) {
+    Print(L"ERROR: Could not retrieve the package list: %r\n", Status);
+    FreePool(PackageList);
+    return Status;
+  }
+
+  ParseHiiPackageLists(PackageList, PackageListSize);
+
+  FreePool(PackageList);
+
+  return EFI_SUCCESS;
+}
diff --git a/UefiLessonsPkg/ShowHIIext/ShowHIIext.inf b/UefiLessonsPkg/ShowHIIext/ShowHIIext.inf
new file mode 100644
index 0000000..fffbecf
--- /dev/null
+++ b/UefiLessonsPkg/ShowHIIext/ShowHIIext.inf
@@ -0,0 +1,32 @@
+##
+# Copyright (c) 2024, Konstantin Aladyshev <aladyshev22@gmail.com>
+#
+# SPDX-License-Identifier: MIT
+##
+
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = ShowHIIext
+  FILE_GUID                      = 9d7386b0-6c1b-4815-94c5-24c385e3d123
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = ShellCEntryLib
+  UEFI_HII_RESOURCE_SECTION      = TRUE
+
+[Sources]
+  ShowHIIext.c
+  Strings.uni
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  ShellPkg/ShellPkg.dec
+
+[LibraryClasses]
+  ShellCEntryLib
+  UefiLib
+  ShellLib
+  HiiLib
+
+[Protocols]
+  gEfiHiiDatabaseProtocolGuid
diff --git a/UefiLessonsPkg/ShowHIIext/Strings.uni b/UefiLessonsPkg/ShowHIIext/Strings.uni
new file mode 100644
index 0000000..8c04771
--- /dev/null
+++ b/UefiLessonsPkg/ShowHIIext/Strings.uni
@@ -0,0 +1,20 @@
+//
+// Copyright (c) 2024, Konstantin Aladyshev <aladyshev22@gmail.com>
+//
+// SPDX-License-Identifier: MIT
+//
+
+#langdef en-US "English"
+
+#string STR_HELP        #language en-US ""
+".TH ShowHIIext 0 "Show HII database packages"\r\n"
+".SH NAME\r\n"
+"Shows packages installed into the HII database.\r\n"
+".SH SYNOPSIS\r\n"
+"\r\n"
+"SHOWHIIEXT [-b] [save [<index>]]\r\n"
+".SH OPTIONS\r\n"
+"\r\n"
+"  -b            - Display one screen at a time\r\n"
+"  save          - Save all package lists as files\r\n"
+"  save <index>  - Save package list with index <index> as a file\r\n"
diff --git a/UefiLessonsPkg/UefiLessonsPkg.dsc b/UefiLessonsPkg/UefiLessonsPkg.dsc
index 14bd3c2..d51eb2c 100644
--- a/UefiLessonsPkg/UefiLessonsPkg.dsc
+++ b/UefiLessonsPkg/UefiLessonsPkg.dsc
@@ -89,6 +89,8 @@
   UefiLessonsPkg/HIIFormDataElementsVarstore/HIIFormDataElementsVarstore.inf
   UefiLessonsPkg/FfsFile/FfsFile.inf
   UefiLessonsPkg/SetSku/SetSku.inf
+  UefiLessonsPkg/HiddenSettings/HiddenSettings.inf
+  UefiLessonsPkg/ShowHIIext/ShowHIIext.inf
 
 #[PcdsFixedAtBuild]
 #  gUefiLessonsPkgTokenSpaceGuid.PcdInt8|0x88|UINT8|0x3B81CDF1
diff --git a/bin/HiddenSettings.efi b/bin/HiddenSettings.efi
new file mode 100644
index 0000000..f1a8e73
--- /dev/null
+++ b/bin/HiddenSettings.efi
diff --git a/bin/ShowHIIext.efi b/bin/ShowHIIext.efi
new file mode 100644
index 0000000..38074f0
--- /dev/null
+++ b/bin/ShowHIIext.efi