Move lessons to separate folder

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

30 files changed, 1642 insertions, 0 deletions

diff --git a/Lessons/Lesson_29/Conf/target.txt b/Lessons/Lesson_29/Conf/target.txt
new file mode 100644
index 0000000..c109dcf
--- /dev/null
+++ b/Lessons/Lesson_29/Conf/target.txt
@@ -0,0 +1,7 @@
+ACTIVE_PLATFORM       = UefiLessonsPkg/UefiLessonsPkg.dsc

+TARGET                = RELEASE

+TARGET_ARCH           = X64

+TOOL_CHAIN_CONF       = Conf/tools_def.txt

+TOOL_CHAIN_TAG        = GCC5

+BUILD_RULE_CONF = Conf/build_rule.txt

+

diff --git a/Lessons/Lesson_29/README.md b/Lessons/Lesson_29/README.md
new file mode 100644
index 0000000..1b613e7
--- /dev/null
+++ b/Lessons/Lesson_29/README.md
@@ -0,0 +1,427 @@
+In the last lesson we've discovered that our system has BGRT ACPI table.
+
+According to the ACPI specification:
+```
+The Boot Graphics Resource Table (BGRT) is an optional table that provides a mechanism to indicate that
+an image was drawn on the screen during boot, and some information about the image.
+The table is written when the image is drawn on the screen. This should be done after it is expected that
+any firmware components that may write to the screen are done doing so and it is known that the image
+is the only thing on the screen. If the boot path is interrupted (e.g., by a key press), the valid bit within the
+status field should be changed to 0 to indicate to the OS that the current image is invalidated
+```
+This table actually have a pointer to image data, check structure definition under https://github.com/tianocore/edk2/blob/master/MdePkg/Include/IndustryStandard/Acpi63.h:
+```
+///
+/// Boot Graphics Resource Table definition.
+///
+typedef struct {
+  EFI_ACPI_DESCRIPTION_HEADER Header;
+  ///
+  /// 2-bytes (16 bit) version ID. This value must be 1.
+  ///
+  UINT16                      Version;
+  ///
+  /// 1-byte status field indicating current status about the table.
+  ///     Bits[7:1] = Reserved (must be zero)
+  ///     Bit [0] = Valid. A one indicates the boot image graphic is valid.
+  ///
+  UINT8                       Status;
+  ///
+  /// 1-byte enumerated type field indicating format of the image.
+  ///     0 = Bitmap
+  ///     1 - 255  Reserved (for future use)
+  ///
+  UINT8                       ImageType;
+  ///
+  /// 8-byte (64 bit) physical address pointing to the firmware's in-memory copy
+  /// of the image bitmap.
+  ///
+  UINT64                      ImageAddress;
+  ///
+  /// A 4-byte (32-bit) unsigned long describing the display X-offset of the boot image.
+  /// (X, Y) display offset of the top left corner of the boot image.
+  /// The top left corner of the display is at offset (0, 0).
+  ///
+  UINT32                      ImageOffsetX;
+  ///
+  /// A 4-byte (32-bit) unsigned long describing the display Y-offset of the boot image.
+  /// (X, Y) display offset of the top left corner of the boot image.
+  /// The top left corner of the display is at offset (0, 0).
+  ///
+  UINT32                      ImageOffsetY;
+} EFI_ACPI_6_3_BOOT_GRAPHICS_RESOURCE_TABLE;
+```
+
+
+Let's create an app that would save an image from BGRT.
+
+This time to get BGRT table we would utilize `EFI_ACPI_SDT_PROTOCOL` protocol.
+
+To get ACPI table data we would use `GetAcpiTable()` function from this protocol:
+```
+EFI_ACPI_SDT_PROTOCOL.GetAcpiTable()
+
+Summary:
+Returns a requested ACPI table.
+
+Prototype:
+typedef
+EFI_STATUS
+(EFIAPI *EFI_ACPI_GET_ACPI_TABLE) (
+ IN UINTN Index,
+ OUT EFI_ACPI_SDT_HEADER **Table,
+ OUT EFI_ACPI_TABLE_VERSION *Version,
+ OUT UINTN *TableKey
+ );
+
+Parameters:
+Index		The zero-based index of the table to retrieve.
+Table		Pointer for returning the table buffer.
+Version		On return, updated with the ACPI versions to which this table belongs.
+TableKey	On return, points to the table key for the specified ACPI system definition table.
+
+Description:
+The GetAcpiTable() function returns a pointer to a buffer containing the ACPI table associated with the Index that was input. The following structures are not considered elements in the list of ACPI tables:
+- Root System Description Pointer (RSD_PTR)
+- Root System Description Table (RSDT)
+- Extended System Description Table (XSDT)
+```
+In edk2 it is defined here: https://github.com/tianocore/edk2/blob/master/MdePkg/Include/Protocol/AcpiSystemDescriptionTable.h
+
+To get all tables we need to call `GetAcpiTable` with incrementing values for `Index` starting with 0, while function returns `EFI_SUCCESS`.
+
+On every success call we would get a pointer to a common header for a ACPI table:
+```
+typedef struct {
+ UINT32 Signature;
+ UINT32 Length;
+ UINT8 Revision;
+ UINT8 Checksum;
+ CHAR8 OemId[6];
+ CHAR8 OemTableId[8];
+ UINT32 OemRevision;
+ UINT32 CreatorId;
+ UINT32 CreatorRevision;
+} EFI_ACPI_SDT_HEADER;
+```
+
+To use `EFI_ACPI_SDT_PROTOCOL` we need to add include to our file:
+```
+#include <Protocol/AcpiSystemDescriptionTable.h>
+```
+And add protocol to the *.inf file:
+```
+[Protocols]
+  gEfiAcpiSdtProtocolGuid
+```
+
+Here is a code finding BGRT ACPI table:
+```
+EFI_ACPI_SDT_PROTOCOL* AcpiSdtProtocol;
+EFI_STATUS Status = gBS->LocateProtocol (
+                &gEfiAcpiSdtProtocolGuid,
+                NULL,
+                (VOID**)&AcpiSdtProtocol
+                );
+if (EFI_ERROR (Status)) {
+  return Status;
+}
+
+BOOLEAN BGRT_found = FALSE;
+UINTN Index = 0;
+EFI_ACPI_SDT_HEADER* Table;
+EFI_ACPI_TABLE_VERSION Version;
+UINTN TableKey;
+while (TRUE) {
+  Status = AcpiSdtProtocol->GetAcpiTable(Index,
+    &Table,
+    &Version,
+    &TableKey
+  );
+  if (EFI_ERROR(Status)) {
+    break;
+  }
+  if (((CHAR8)((Table->Signature >>  0) & 0xFF) == 'B') &&
+      ((CHAR8)((Table->Signature >>  8) & 0xFF) == 'G') &&
+      ((CHAR8)((Table->Signature >> 16) & 0xFF) == 'R') &&
+      ((CHAR8)((Table->Signature >> 24) & 0xFF) == 'T')) {
+    BGRT_found = TRUE;
+    break;
+  }
+  Index++;
+}
+if (!BGRT_found) {
+  Print(L"BGRT table is not present in the system\n");
+  return EFI_UNSUPPORTED;
+}
+```
+
+Now we need to save an image from BGRT table.
+
+Currently ACPI specification support only BMP image type https://uefi.org/specs/ACPI/6.4/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#image-type
+
+So first we check if the type is actually BMP:
+```
+EFI_ACPI_6_3_BOOT_GRAPHICS_RESOURCE_TABLE* BGRT = (EFI_ACPI_6_3_BOOT_GRAPHICS_RESOURCE_TABLE*)Table;
+if (BGRT->ImageType == 0) {
+  ...
+}
+```
+
+Now we need to actually save a BMP image. BGRT doesn't contain any size for an image, only offset to data: `ImageAddress`.
+
+To get image size we need to look at BMP header. 
+
+In edk2 it is defined under https://github.com/tianocore/edk2/blob/master/MdePkg/Include/IndustryStandard/Bmp.h:
+```
+typedef struct {
+  CHAR8         CharB;
+  CHAR8         CharM;
+  UINT32        Size;
+  UINT16        Reserved[2];
+  UINT32        ImageOffset;
+  UINT32        HeaderSize;
+  UINT32        PixelWidth;
+  UINT32        PixelHeight;
+  UINT16        Planes;          ///< Must be 1
+  UINT16        BitPerPixel;     ///< 1, 4, 8, or 24
+  UINT32        CompressionType;
+  UINT32        ImageSize;       ///< Compressed image size in bytes
+  UINT32        XPixelsPerMeter;
+  UINT32        YPixelsPerMeter;
+  UINT32        NumberOfColors;
+  UINT32        ImportantColors;
+} BMP_IMAGE_HEADER;
+```
+
+Don't forget to include this file in our program:
+```
+#include <IndustryStandard/Bmp.h>
+```
+
+When we know that the image is BMP, we can check its signature (`BM`), parse its size and actually write its data to a file. Here we use `EFI_STATUS WriteFile(CHAR16* FileName, VOID* Data, UINTN* Size)` function to write data to a file, we will define it in a minute:
+```
+BMP_IMAGE_HEADER* BMP = (BMP_IMAGE_HEADER*)(BGRT->ImageAddress);
+
+if ((BMP->CharB != 'B') || (BMP->CharM != 'M')) {
+  Print(L"BMP image has wrong signature!\n");
+  return EFI_UNSUPPORTED;
+}
+Print(L"BGRT conatins BMP image with %dx%d resolution\n", BMP->PixelWidth, BMP->PixelHeight);
+UINTN Size = BMP->Size;
+Status = WriteFile(L"BGRT.bmp", BMP, &Size);
+if (EFI_ERROR(Status)) {
+  Print(L"Error! Can't write BGRT.bmp file\n");
+}
+```
+
+Last time we've used `EFI_SHELL_PROTOCOL` to create a file and write data to it. This time we will try to utilize ShelLib:
+
+https://github.com/tianocore/edk2/blob/master/ShellPkg/Include/Library/ShellLib.h
+
+https://github.com/tianocore/edk2/blob/master/ShellPkg/Library/UefiShellLib/UefiShellLib.c
+
+Again we will need 3 functions: for file open, write and close:
+```
+/**
+  This function will open a file or directory referenced by filename.
+  If return is EFI_SUCCESS, the Filehandle is the opened file's handle;
+  otherwise, the Filehandle is NULL. Attributes is valid only for
+  EFI_FILE_MODE_CREATE.
+  @param[in] FileName           The pointer to file name.
+  @param[out] FileHandle        The pointer to the file handle.
+  @param[in] OpenMode           The mode to open the file with.
+  @param[in] Attributes         The file's file attributes.
+  ...
+**/
+
+EFI_STATUS
+EFIAPI
+ShellOpenFileByName(
+  IN CONST CHAR16               *FileName,
+  OUT SHELL_FILE_HANDLE         *FileHandle,
+  IN UINT64                     OpenMode,
+  IN UINT64                     Attributes
+  );
+```
+```
+/**
+  Write data to a file.
+  This function writes the specified number of bytes to the file at the current
+  file position. The current file position is advanced the actual number of bytes
+  written, which is returned in BufferSize. Partial writes only occur when there
+  has been a data error during the write attempt (such as "volume space full").
+  The file is automatically grown to hold the data if required. Direct writes to
+  opened directories are not supported.
+  @param[in] FileHandle          The opened file for writing.
+  @param[in, out] BufferSize     On input the number of bytes in Buffer.  On output
+                                 the number of bytes written.
+  @param[in] Buffer              The buffer containing data to write is stored.
+  ...
+**/
+
+EFI_STATUS
+EFIAPI
+ShellWriteFile(
+  IN SHELL_FILE_HANDLE          FileHandle,
+  IN OUT UINTN                  *BufferSize,
+  IN VOID                       *Buffer
+  );
+```
+```
+/**
+  Close an open file handle.
+  This function closes a specified file handle. All "dirty" cached file data is
+  flushed to the device, and the file is closed. In all cases the handle is
+  closed.
+  @param[in] FileHandle           The file handle to close.
+**/
+
+EFI_STATUS
+EFIAPI
+ShellCloseFile (
+  IN SHELL_FILE_HANDLE          *FileHandle
+  );
+```
+
+Advantage of using `ShellLib` is that now we don't need to find `EFI_SHELL_PROTOCOL` and work with it manually.
+
+
+Our `WriteFile` function would look like this:
+```
+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 it to %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;
+}
+```
+
+To use ShellLib we need to include a header in our program:
+```
+#include <Library/ShellLib.h>
+```
+
+Also we need to add `ShellPkg.dec` to our packages and add `ShellLib` to our library classes:
+```
+[Packages]
+  MdePkg/MdePkg.dec
++  ShellPkg/ShellPkg.dec
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
++  ShellLib
+```
+Besides that our package `*.dsc` file needs to include a `ShellLib` library class:
+```
+[LibraryClasses]
+  ...
+  ShellLib|ShellPkg/Library/UefiShellLib/UefiShellLib.inf
+```
+
+Unfortunately this is not enough, our current build would fail with a message, because `ShellLib` by itself needs another library:
+```
+build.py...
+/home/kostr/tiano/edk2/UefiLessonsPkg/UefiLessonsPkg.dsc(...): error 4000: Instance of library class [FileHandleLib] is not found
+```
+
+To find it use our standard tactic:
+```
+$ grep FileHandleLib -r ./ --include=*.inf | grep LIBRARY_CLASS
+```
+
+In the end we had to add several more LibraryClasses to make our build succeed:
+```
+[LibraryClasses]
+  ...
+  FileHandleLib|MdePkg/Library/UefiFileHandleLib/UefiFileHandleLib.inf
+  HiiLib|MdeModulePkg/Library/UefiHiiLib/UefiHiiLib.inf
+  SortLib|MdeModulePkg/Library/UefiSortLib/UefiSortLib.inf
+  UefiHiiServicesLib|MdeModulePkg/Library/UefiHiiServicesLib/UefiHiiServicesLib.inf
+```
+
+Build our app and execute it under OVMF:
+```
+FS0:\> SaveBGRT.efi
+BGRT conatins BMP image with 193x58 resolution
+Save it to BGRT.bmp7
+FS0:\>
+```
+
+If you look at the BGRT.bmp picture that are app have produced, it would have the same content as https://raw.githubusercontent.com/tianocore/edk2/master/MdeModulePkg/Logo/Logo.bmp
+
+The file itself wouldn't be the same since BGRT driver don't use an image from flash, but actually grabs a boot screen and transforms it to a BMP image. For the proof checkout how https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Universal/Acpi/BootGraphicsResourceTableDxe/BootGraphicsResourceTableDxe.c uses `TranslateGopBltToBmp` function from the https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Library/BaseBmpSupportLib/BmpSupportLib.c library.
+If you find it strange that BGRT grabs a screen instead of using an image from flash, remember how BGRT is defined in ACPI specification:
+```
+The Boot Graphics Resource Table (BGRT) is an optional table that provides a mechanism to indicate that an image was drawn on the screen during boot
+```
+
+The file GUID for binary boot logo image is defined in the file https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Logo/Logo.inf
+```
+FILE_GUID                      = 7BB28B99-61BB-11D5-9A5D-0090273FC14D
+```
+It is a GUID that is usually used for the Logo image in BIOS. It is even hardcoded to https://github.com/tianocore/edk2/blob/master/BaseTools/Source/Python/Eot/Report.py
+```
+## GenerateFfs() method
+#
+#  Generate FFS information
+#
+#  @param self: The object pointer
+#  @param FfsObj: FFS object after FV image is parsed
+#
+def GenerateFfs(self, FfsObj):
+    self.FfsIndex = self.FfsIndex + 1
+    if FfsObj is not None and FfsObj.Type in [0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0xA]:
+        FfsGuid = FfsObj.Guid
+        FfsOffset = FfsObj._OFF_
+        FfsName = 'Unknown-Module'
+        FfsPath = FfsGuid
+        FfsType = FfsObj._TypeName[FfsObj.Type]
+
+        # Hard code for Binary INF
+        if FfsGuid.upper() == '7BB28B99-61BB-11D5-9A5D-0090273FC14D':
+            FfsName = 'Logo'
+
+        if FfsGuid.upper() == '7E374E25-8E01-4FEE-87F2-390C23C606CD':
+            FfsName = 'AcpiTables'
+
+        if FfsGuid.upper() == '961578FE-B6B7-44C3-AF35-6BC705CD2B1F':
+            FfsName = 'Fat'
+        ...
+```
+
+If you want to know how Logo and BGRT are work in edk2, checkout these drivers:
+- https://github.com/tianocore/edk2/tree/master/MdeModulePkg/Library/BootLogoLib/
+- https://github.com/tianocore/edk2/tree/master/MdeModulePkg/Logo/
+- https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Universal/Acpi/BootGraphicsResourceTableDxe/
+- https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Library/BaseBmpSupportLib/
+
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/AcpiInfo/AcpiInfo.c b/Lessons/Lesson_29/UefiLessonsPkg/AcpiInfo/AcpiInfo.c
new file mode 100644
index 0000000..0511f59
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/AcpiInfo/AcpiInfo.c
@@ -0,0 +1,106 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+#include <Library/BaseMemoryLib.h>
+#include <Protocol/Shell.h>
+
+EFI_STATUS
+EFIAPI
+UefiMain (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_SHELL_PROTOCOL* ShellProtocol;
+  EFI_STATUS Status = gBS->LocateProtocol(
+    &gEfiShellProtocolGuid,
+    NULL,
+    (VOID **)&ShellProtocol
+  );
+
+  if (EFI_ERROR(Status)) {
+    Print(L"Can't open EFI_SHELL_PROTOCOL: %r\n", Status);
+    return EFI_SUCCESS;
+  }
+
+  EFI_ACPI_6_3_ROOT_SYSTEM_DESCRIPTION_POINTER* RSDP = NULL;
+
+  for (UINTN i=0; i<SystemTable->NumberOfTableEntries; i++) {
+    if (CompareGuid(&(SystemTable->ConfigurationTable[i].VendorGuid), &gEfiAcpi20TableGuid)) {
+      Print(L"RSDP table is placed at %p\n\n", SystemTable->ConfigurationTable[i].VendorTable);
+      RSDP = SystemTable->ConfigurationTable[i].VendorTable;
+    }
+  }
+
+  if (!RSDP) {
+    Print(L"No ACPI2.0 table was found in the system\n");
+    return EFI_SUCCESS;
+  }
+
+  if (((CHAR8)((RSDP->Signature >>  0) & 0xFF) != 'R') ||
+      ((CHAR8)((RSDP->Signature >>  8) & 0xFF) != 'S') ||
+      ((CHAR8)((RSDP->Signature >> 16) & 0xFF) != 'D') ||
+      ((CHAR8)((RSDP->Signature >> 24) & 0xFF) != ' ') ||
+      ((CHAR8)((RSDP->Signature >> 32) & 0xFF) != 'P') ||
+      ((CHAR8)((RSDP->Signature >> 40) & 0xFF) != 'T') ||
+      ((CHAR8)((RSDP->Signature >> 48) & 0xFF) != 'R') ||
+      ((CHAR8)((RSDP->Signature >> 56) & 0xFF) != ' ')) {
+    Print(L"Error! RSDP signature is not valid!\n");
+    return EFI_SUCCESS;
+  }
+
+  Print(L"System description tables:\n");
+  Print(L"\tRSDT table is placed at address %p\n", RSDP->RsdtAddress);
+  Print(L"\tXSDT table is placed at address %p\n", RSDP->XsdtAddress);
+  Print(L"\n");
+
+  EFI_ACPI_DESCRIPTION_HEADER* XSDT = (EFI_ACPI_DESCRIPTION_HEADER*)RSDP->XsdtAddress;
+  if (((CHAR8)((XSDT->Signature >>  0) & 0xFF) != 'X') ||
+      ((CHAR8)((XSDT->Signature >>  8) & 0xFF) != 'S') ||
+      ((CHAR8)((XSDT->Signature >> 16) & 0xFF) != 'D') ||
+      ((CHAR8)((XSDT->Signature >> 24) & 0xFF) != 'T')) {
+    Print(L"Error! XSDT signature is not valid!\n");
+    return EFI_SUCCESS;
+  }
+
+  Print(L"Main ACPI tables:\n");
+  UINT64 offset = sizeof(EFI_ACPI_DESCRIPTION_HEADER);
+  while (offset < XSDT->Length) {
+    UINT64* table_address = (UINT64*)((UINT8*)XSDT + offset);
+    EFI_ACPI_6_3_COMMON_HEADER* table = (EFI_ACPI_6_3_COMMON_HEADER*)(*table_address);
+    CHAR16 TableName[5];
+    TableName[0] = (CHAR16)((table->Signature>> 0)&0xFF);
+    TableName[1] = (CHAR16)((table->Signature>> 8)&0xFF);
+    TableName[2] = (CHAR16)((table->Signature>>16)&0xFF);
+    TableName[3] = (CHAR16)((table->Signature>>24)&0xFF);
+    TableName[4] = 0;
+
+    Print(L"\t%s table is placed at address %p with length 0x%x\n",
+                                             TableName,
+                                             table,
+                                             table->Length);
+    CHAR16 FileName[9] = {0};
+    StrCpyS(FileName, 9, TableName);
+    StrCatS(FileName, 9, L".aml");
+    SHELL_FILE_HANDLE FileHandle;
+    Status = ShellProtocol->OpenFileByName(FileName,
+                                           &FileHandle,
+                                           EFI_FILE_MODE_CREATE | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_READ);
+    if (!EFI_ERROR(Status)) {
+      UINTN size = table->Length;
+      Status = ShellProtocol->WriteFile(FileHandle, &size, (VOID*)table);
+      if (EFI_ERROR(Status)) {
+        Print(L"Error in WriteFile: %r\n", Status);
+      }
+      Status = ShellProtocol->CloseFile(FileHandle);
+      if (EFI_ERROR(Status)) {
+        Print(L"Error in CloseFile: %r\n", Status);
+      }
+    } else {
+      Print(L"Error in OpenFileByName: %r\n", Status);
+    }
+    offset += sizeof(UINT64);
+  }
+
+  return EFI_SUCCESS;
+}
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/AcpiInfo/AcpiInfo.inf b/Lessons/Lesson_29/UefiLessonsPkg/AcpiInfo/AcpiInfo.inf
new file mode 100644
index 0000000..53d0356
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/AcpiInfo/AcpiInfo.inf
@@ -0,0 +1,24 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = AcpiInfo
+  FILE_GUID                      = 18998798-69a2-4ab5-9ffc-a8ee2494b029
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = UefiMain
+
+[Sources]
+  AcpiInfo.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
+
+[Guids]
+  gEfiAcpi20TableGuid
+
+[Protocols]
+  gEfiShellProtocolGuid
+
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/HelloWorld/HelloWorld.c b/Lessons/Lesson_29/UefiLessonsPkg/HelloWorld/HelloWorld.c
new file mode 100644
index 0000000..29a4812
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/HelloWorld/HelloWorld.c
@@ -0,0 +1,19 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+EFI_STATUS
+EFIAPI
+UefiMain (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  SystemTable->ConOut->OutputString(SystemTable->ConOut, L"Hello World!\n");
+  gST->ConOut->OutputString(gST->ConOut, L"Hello again!\n");
+  Print(L"Bye!\n");
+
+  UINTN Index;
+  gBS->WaitForEvent(1, &(gST->ConIn->WaitForKey), &Index);
+  gST->ConIn->Reset(gST->ConIn, FALSE);
+  return EFI_SUCCESS;
+}
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/HelloWorld/HelloWorld.inf b/Lessons/Lesson_29/UefiLessonsPkg/HelloWorld/HelloWorld.inf
new file mode 100644
index 0000000..d65ca2e
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/HelloWorld/HelloWorld.inf
@@ -0,0 +1,18 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = HelloWorld
+  FILE_GUID                      = 2e55fa38-f148-42d3-af90-1be247323e30
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = UefiMain
+
+[Sources]
+  HelloWorld.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
+
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/ImageHandle/ImageHandle.c b/Lessons/Lesson_29/UefiLessonsPkg/ImageHandle/ImageHandle.c
new file mode 100644
index 0000000..32e9c43
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/ImageHandle/ImageHandle.c
@@ -0,0 +1,105 @@
+#include <Library/MemoryAllocationLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+typedef struct {
+  UINTN               Signature;
+  /// All handles list of IHANDLE
+  LIST_ENTRY          AllHandles;
+  /// List of PROTOCOL_INTERFACE's for this handle
+  LIST_ENTRY          Protocols;
+  UINTN               LocateRequest;
+  /// The Handle Database Key value when this handle was last created or modified
+  UINT64              Key;
+} IHANDLE;
+
+typedef struct {
+  UINTN               Signature;
+  /// Link Entry inserted to mProtocolDatabase
+  LIST_ENTRY          AllEntries;
+  /// ID of the protocol
+  EFI_GUID            ProtocolID;
+  /// All protocol interfaces
+  LIST_ENTRY          Protocols;
+  /// Registerd notification handlers
+  LIST_ENTRY          Notify;
+} PROTOCOL_ENTRY;
+
+typedef struct {
+  UINTN                       Signature;
+  /// Link on IHANDLE.Protocols
+  LIST_ENTRY                  Link;
+  /// Back pointer
+  IHANDLE                     *Handle;
+  /// Link on PROTOCOL_ENTRY.Protocols
+  LIST_ENTRY                  ByProtocol;
+  /// The protocol ID
+  PROTOCOL_ENTRY              *Protocol;
+  /// The interface value
+  VOID                        *Interface;
+  /// OPEN_PROTOCOL_DATA list
+  LIST_ENTRY                  OpenList;
+  UINTN                       OpenListCount;
+
+} PROTOCOL_INTERFACE;
+
+
+#define offsetof(a,b) ((INTN)(&(((a*)(0))->b)))
+
+#define container_of(ptr, type, member) ({                      \
+        const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
+        (type *)( (char *)__mptr - offsetof(type,member) );})
+
+EFI_STATUS
+EFIAPI
+UefiMain (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  IHANDLE* MyHandle = ImageHandle;
+  Print(L"Signature: %c %c %c %c\n", (MyHandle->Signature >>  0) & 0xff,
+                                     (MyHandle->Signature >>  8) & 0xff,
+                                     (MyHandle->Signature >> 16) & 0xff,
+                                     (MyHandle->Signature >> 24) & 0xff);
+
+  Print(L"Back Protocol Interface Link: %p\n", MyHandle->Protocols.BackLink);
+  Print(L"Forward Protocol Interface Link: %p\n", MyHandle->Protocols.ForwardLink);
+
+  LIST_ENTRY *FirstLink = MyHandle->Protocols.ForwardLink;
+  LIST_ENTRY *CurrentLink = FirstLink;
+  do {
+  	PROTOCOL_INTERFACE* MyProtocolInterface = container_of(CurrentLink, PROTOCOL_INTERFACE, Link);
+
+        Print(L"\n");
+        Print(L"Current Link: %p\n", CurrentLink);
+  	Print(L"Signature: %x %x %x %x\n", (MyProtocolInterface->Signature >>  0) & 0xff,
+        	                           (MyProtocolInterface->Signature >>  8) & 0xff,
+                	                   (MyProtocolInterface->Signature >> 16) & 0xff,
+                        	           (MyProtocolInterface->Signature >> 24) & 0xff);
+
+  	Print(L"Back Link: %p\n", MyProtocolInterface->Link.BackLink);
+	Print(L"Forward Link: %p\n", MyProtocolInterface->Link.ForwardLink);
+	Print(L"GUID=%g\n", MyProtocolInterface->Protocol->ProtocolID);
+        CurrentLink = MyProtocolInterface->Link.ForwardLink;
+  } while (CurrentLink != FirstLink);
+
+  Print(L"________\n");
+  EFI_GUID **ProtocolGuidArray;
+  UINTN ArrayCount;
+  //EFI_STATUS Status = gBS->ProtocolsPerHandle(NULL,		// Use this to test %r Print formatting option
+  EFI_STATUS Status = gBS->ProtocolsPerHandle(ImageHandle,
+					      &ProtocolGuidArray,
+					      &ArrayCount);
+
+  if (!EFI_ERROR(Status)) {
+    for (int i=0; i<ArrayCount; i++) {
+      Print(L"%g\n", ProtocolGuidArray[i]);
+    }
+    FreePool(ProtocolGuidArray);
+  } else {
+    Print(L"ProtocolsPerHandle error: %r\n", Status);
+  }
+
+  return EFI_SUCCESS;
+}
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/ImageHandle/ImageHandle.inf b/Lessons/Lesson_29/UefiLessonsPkg/ImageHandle/ImageHandle.inf
new file mode 100644
index 0000000..34256ee
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/ImageHandle/ImageHandle.inf
@@ -0,0 +1,18 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = ImageHandle
+  FILE_GUID                      = b68d3472-70c7-4928-841b-6566032e0a23
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = UefiMain
+
+[Sources]
+  ImageHandle.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
+
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/ImageInfo/ImageInfo.c b/Lessons/Lesson_29/UefiLessonsPkg/ImageInfo/ImageInfo.c
new file mode 100644
index 0000000..c45570e
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/ImageInfo/ImageInfo.c
@@ -0,0 +1,44 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+#include <Protocol/LoadedImage.h>
+#include <Library/DevicePathLib.h>
+
+EFI_STATUS
+EFIAPI
+UefiMain (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS Status;
+  EFI_LOADED_IMAGE_PROTOCOL* LoadedImage;
+
+  Status = gBS->HandleProtocol(
+    ImageHandle,
+    &gEfiLoadedImageProtocolGuid,
+    (VOID **) &LoadedImage
+  );
+
+  if (Status == EFI_SUCCESS) {
+    EFI_DEVICE_PATH_PROTOCOL* DevicePath;
+
+    Status = gBS->HandleProtocol(
+      ImageHandle,
+      &gEfiLoadedImageDevicePathProtocolGuid,
+      (VOID**) &DevicePath
+    );
+
+    if (Status == EFI_SUCCESS) {
+      Print(L"Image device: %s\n", ConvertDevicePathToText(DevicePath, FALSE, TRUE));
+      Print(L"Image file: %s\n",  ConvertDevicePathToText(LoadedImage->FilePath, FALSE, TRUE));	// EFI_DEVICE_PATH_PROTOCOL *FilePath
+      Print(L"Image Base: %X\n", LoadedImage->ImageBase);
+      Print(L"Image Size: %X\n", LoadedImage->ImageSize);
+    } else {
+      Print(L"Can't get EFI_LOADED_IMAGE_PROTOCOL, Status=%r\n", Status);
+    }
+  } else {
+    Print(L"Can't get EFI_DEVICE_PATH_PROTOCOL, Status=%r\n", Status);
+  }
+  return EFI_SUCCESS;
+}
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/ImageInfo/ImageInfo.inf b/Lessons/Lesson_29/UefiLessonsPkg/ImageInfo/ImageInfo.inf
new file mode 100644
index 0000000..0ce54a6
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/ImageInfo/ImageInfo.inf
@@ -0,0 +1,22 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = ImageInfo
+  FILE_GUID                      = b68d3472-70c7-4928-841b-6566032e0a23
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = UefiMain
+
+[Sources]
+  ImageInfo.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
+
+[Protocols]
+  gEfiLoadedImageProtocolGuid
+  gEfiLoadedImageDevicePathProtocolGuid
+
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/InteractiveApp/InteractiveApp.c b/Lessons/Lesson_29/UefiLessonsPkg/InteractiveApp/InteractiveApp.c
new file mode 100644
index 0000000..59c89a9
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/InteractiveApp/InteractiveApp.c
@@ -0,0 +1,34 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+EFI_STATUS
+EFIAPI
+UefiMain (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  UINTN Index;
+  EFI_INPUT_KEY Key;
+
+  Print(L"Try to guess the secret symbol!\n");
+  Print(L"To quit press 'q'\n");
+
+  while(TRUE) {
+    gBS->WaitForEvent(1, &(gST->ConIn->WaitForKey), &Index);
+    gST->ConIn->ReadKeyStroke(gST->ConIn, &Key);
+    Print(L"ScanCode = %04x, UnicodeChar = %04x (%c)\n", Key.ScanCode, Key.UnicodeChar, Key.UnicodeChar);
+
+    if (Key.UnicodeChar == 'k') {
+      Print(L"Correct!\n");
+      break;
+    } else if (Key.UnicodeChar == 'q') {
+      Print(L"Bye!\n");
+      break;
+    } else {
+      Print(L"Wrong!\n");
+    }
+  }
+  gST->ConIn->Reset(gST->ConIn, FALSE);
+  return EFI_SUCCESS;
+}
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/InteractiveApp/InteractiveApp.inf b/Lessons/Lesson_29/UefiLessonsPkg/InteractiveApp/InteractiveApp.inf
new file mode 100644
index 0000000..700b779
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/InteractiveApp/InteractiveApp.inf
@@ -0,0 +1,18 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = InteractiveApp
+  FILE_GUID                      = 1539451b-f300-41fa-a565-dde69c1bed66
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = UefiMain
+
+[Sources]
+  InteractiveApp.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
+
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/ListVariables/ListVariables.c b/Lessons/Lesson_29/UefiLessonsPkg/ListVariables/ListVariables.c
new file mode 100644
index 0000000..1f3ef4a
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/ListVariables/ListVariables.c
@@ -0,0 +1,46 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+
+#include <Library/MemoryAllocationLib.h>
+#include <Library/UefiRuntimeServicesTableLib.h>
+
+INTN EFIAPI ShellAppMain(IN UINTN Argc, IN CHAR16 **Argv)
+{
+  EFI_GUID VendorGuid;
+  UINTN VariableNameSize = sizeof (CHAR16);
+  CHAR16* VariableName = AllocateZeroPool(sizeof(CHAR16));
+  if (VariableName == NULL) {
+    Print(L"Error on AllocateZeroPool call\n");
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  while (TRUE)
+  {
+    UINTN VariableNameSizeOld = VariableNameSize;
+    EFI_STATUS Status = gRT->GetNextVariableName(&VariableNameSize, VariableName, &VendorGuid);
+    if (Status == EFI_SUCCESS) {
+      Print(L"%g: %s\n", VendorGuid, VariableName);
+    } else if (Status == EFI_BUFFER_TOO_SMALL) {
+      VariableName = ReallocatePool(VariableNameSizeOld, VariableNameSize, VariableName);
+      if (VariableName == NULL) {
+        Print(L"Error on ReallocatePool call\n");
+        return EFI_OUT_OF_RESOURCES;
+      }
+      Status = gRT->GetNextVariableName(&VariableNameSize, VariableName, &VendorGuid);
+      if (Status == EFI_SUCCESS) {
+        Print(L"%g: %s\n", VendorGuid, VariableName);
+      } else {
+        Print(L"Error on 'gRT->GetNextVariableName' call: %s\n", Status);
+        return Status;
+      }
+    } else if (Status == EFI_NOT_FOUND) {
+      FreePool(VariableName);
+      return EFI_SUCCESS;
+    } else {
+      Print(L"Error on 'gRT->GetNextVariableName' call: %s\n", Status);
+      return Status;
+    }
+  }
+  return EFI_SUCCESS;
+}
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/ListVariables/ListVariables.inf b/Lessons/Lesson_29/UefiLessonsPkg/ListVariables/ListVariables.inf
new file mode 100644
index 0000000..14e9fa2
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/ListVariables/ListVariables.inf
@@ -0,0 +1,19 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = ListVariables
+  FILE_GUID                      = d66f68b2-3591-45af-bf5d-519152b9d877
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = ShellCEntryLib
+
+[Sources]
+  ListVariables.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
+  ShellCEntryLib
+
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/MemoryInfo/MemoryInfo.c b/Lessons/Lesson_29/UefiLessonsPkg/MemoryInfo/MemoryInfo.c
new file mode 100644
index 0000000..8c3bcf2
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/MemoryInfo/MemoryInfo.c
@@ -0,0 +1,215 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+// for SetMem
+#include <Library/BaseMemoryLib.h>
+
+#include <Protocol/ShellParameters.h> 
+
+const CHAR16 *memory_types[] = { 
+    L"EfiReservedMemoryType", 
+    L"EfiLoaderCode", 
+    L"EfiLoaderData", 
+    L"EfiBootServicesCode", 
+    L"EfiBootServicesData", 
+    L"EfiRuntimeServicesCode", 
+    L"EfiRuntimeServicesData", 
+    L"EfiConventionalMemory", 
+    L"EfiUnusableMemory", 
+    L"EfiACPIReclaimMemory", 
+    L"EfiACPIMemoryNVS", 
+    L"EfiMemoryMappedIO", 
+    L"EfiMemoryMappedIOPortSpace", 
+    L"EfiPalCode",
+    L"EfiPersistentMemory",
+    L"EfiMaxMemoryType"
+};
+
+
+const CHAR16 *memory_types_OS_view[] = { 
+    L"reserved", // L"EfiReservedMemoryType", 
+    L"usable",   // L"EfiLoaderCode", 
+    L"usable",   // L"EfiLoaderData", 
+    L"usable",   // L"EfiBootServicesCode", 
+    L"usable",   // L"EfiBootServicesData", 
+    L"reserved", // L"EfiRuntimeServicesCode", 
+    L"reserved", // L"EfiRuntimeServicesData", 
+    L"usable",   // L"EfiConventionalMemory", 
+    L"reserved", // L"EfiUnusableMemory", 
+    L"ACPI data",// L"EfiACPIReclaimMemory", 
+    L"ACPI NVS", // L"EfiACPIMemoryNVS", 
+    L"reserved", // L"EfiMemoryMappedIO", 
+    L"reserved", // L"EfiMemoryMappedIOPortSpace", 
+    L"reserved", // L"EfiPalCode",
+    L"usable",   // L"EfiPersistentMemory",
+    L"usable",   // L"EfiMaxMemoryType"
+};
+
+
+const CHAR16 * 
+memory_type_to_str(UINT32 type) 
+{ 
+    if (type > sizeof(memory_types)/sizeof(CHAR16 *)) 
+        return L"Unknown"; 
+
+    return memory_types[type]; 
+}
+
+const CHAR16 *
+memory_type_to_str_OS_view(UINT32 type)
+{
+    if (type > sizeof(memory_types_OS_view)/sizeof(CHAR16 *)) 
+        return L"Unknown"; 
+
+    return memory_types_OS_view[type]; 
+}
+
+#define ATTRIBUTE_STR_SIZE 50
+
+#define CHECK_EFI_MEMORY_ATTRIBUTE(attr) if (attrs & EFI_MEMORY_##attr) { \
+                                           StrCpyS(&str[i], ATTRIBUTE_STR_SIZE, L" "#attr); \
+                                           i+=StrLen(L" "#attr); \
+                                         }
+
+const CHAR16 *
+memory_attrs_to_str(CHAR16* str, UINT64 attrs)
+{
+  int i=0;
+  SetMem((VOID *)str, sizeof(str), 0);
+
+  CHECK_EFI_MEMORY_ATTRIBUTE(UC)
+  CHECK_EFI_MEMORY_ATTRIBUTE(WC)
+  CHECK_EFI_MEMORY_ATTRIBUTE(WT)
+  CHECK_EFI_MEMORY_ATTRIBUTE(WB)
+  CHECK_EFI_MEMORY_ATTRIBUTE(UCE)
+  CHECK_EFI_MEMORY_ATTRIBUTE(WP)
+  CHECK_EFI_MEMORY_ATTRIBUTE(RP)
+  CHECK_EFI_MEMORY_ATTRIBUTE(XP)
+  CHECK_EFI_MEMORY_ATTRIBUTE(NV)
+  CHECK_EFI_MEMORY_ATTRIBUTE(MORE_RELIABLE)
+  CHECK_EFI_MEMORY_ATTRIBUTE(RO)
+  CHECK_EFI_MEMORY_ATTRIBUTE(SP)
+  CHECK_EFI_MEMORY_ATTRIBUTE(CPU_CRYPTO)
+  CHECK_EFI_MEMORY_ATTRIBUTE(RUNTIME)
+
+  return str;
+}
+
+EFI_STATUS
+EFIAPI
+UefiMain (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  UINTN MemoryMapSize = 0;
+  EFI_MEMORY_DESCRIPTOR* MemoryMap = NULL;
+  UINTN MapKey;
+  UINTN DescriptorSize;
+  UINT32 DescriptorVersion;
+
+  EFI_STATUS Status;
+
+
+  EFI_SHELL_PARAMETERS_PROTOCOL* ShellParameters;
+
+  Status = gBS->HandleProtocol(
+    ImageHandle,
+    &gEfiShellParametersProtocolGuid,
+    (VOID **) &ShellParameters
+  );
+
+  BOOLEAN full=FALSE;
+  if (Status == EFI_SUCCESS) {
+    if (ShellParameters->Argc == 2) {
+      if (!StrCmp(ShellParameters->Argv[1], L"full")) {
+        full=TRUE;
+      }
+    }
+  }
+
+
+  Status = gBS->GetMemoryMap(
+        &MemoryMapSize,
+        MemoryMap,
+        &MapKey,
+        &DescriptorSize,
+        &DescriptorVersion
+  );
+
+  if (Status == EFI_BUFFER_TOO_SMALL) {
+    Status = gBS->AllocatePool(
+          EfiBootServicesData,
+          MemoryMapSize,
+          (void**)&MemoryMap
+    );
+
+    if (EFI_ERROR(Status)) {
+      Print(L"AllocatePool error: %r\n", Status);
+      return Status;
+    }
+
+    Status = gBS->GetMemoryMap(
+          &MemoryMapSize,
+          MemoryMap,
+          &MapKey,
+          &DescriptorSize,
+          &DescriptorVersion
+    );
+
+    if (!EFI_ERROR(Status))
+    {
+      EFI_MEMORY_DESCRIPTOR* desc = MemoryMap;
+      EFI_MEMORY_DESCRIPTOR* next_desc;
+      int i = 0;
+      while ((UINT8 *)desc < (UINT8 *)MemoryMap + MemoryMapSize) {
+        UINTN PAGE_SIZE = 4096;
+        UINTN mapping_size =(UINTN) desc->NumberOfPages * PAGE_SIZE;
+
+        UINT64 Start = desc->PhysicalStart;
+
+        next_desc = (EFI_MEMORY_DESCRIPTOR *)((UINT8 *)desc + DescriptorSize);
+        if (!full) {
+	  while ((UINT8 *)next_desc < (UINT8 *)MemoryMap + MemoryMapSize) {
+	    mapping_size =(UINTN) desc->NumberOfPages * PAGE_SIZE;
+	    if ((desc->PhysicalStart + mapping_size) == (next_desc->PhysicalStart)) {
+
+              if (desc->Type != next_desc->Type) {
+                if (StrCmp(memory_type_to_str_OS_view(desc->Type), 
+                           memory_type_to_str_OS_view(next_desc->Type)))
+                  break;
+                }
+
+                desc=next_desc;
+	        next_desc = (EFI_MEMORY_DESCRIPTOR *)((UINT8 *)next_desc + DescriptorSize);
+	    } else {
+	        break;
+	    }
+	  }
+        }
+
+        if (full) {
+          CHAR16 str[ATTRIBUTE_STR_SIZE];
+          Print(L"[#%02d] Type: %s  Attr: %s\n", i++, 
+            memory_type_to_str(desc->Type), memory_attrs_to_str(str, desc->Attribute));
+          Print(L"      Phys: %016llx-%016llx\n", Start, Start + mapping_size - 1);
+        }
+        else {
+          Print(L" [mem: %016llx-%016llx] %s\n", Start, desc->PhysicalStart + mapping_size - 1,
+            memory_type_to_str_OS_view(desc->Type) );
+        }
+
+        desc = next_desc;
+      }
+
+      gBS->FreePool(MemoryMap);
+    } else {
+      Print(L"GetMemoryMap with buffer error: %r\n", Status);
+    }
+  } else {
+    Print(L"GetMemoryMap without buffer error: %r\n", Status);
+  }
+
+  return Status;
+}
+
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/MemoryInfo/MemoryInfo.inf b/Lessons/Lesson_29/UefiLessonsPkg/MemoryInfo/MemoryInfo.inf
new file mode 100644
index 0000000..777010d
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/MemoryInfo/MemoryInfo.inf
@@ -0,0 +1,21 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = MemoryInfo
+  FILE_GUID                      = d2ce1d65-603e-4b48-b3e1-fe65d5d0bca8
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = UefiMain
+
+[Sources]
+  MemoryInfo.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
+
+[Protocols]
+  gEfiShellParametersProtocolGuid
+
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/PCDLesson/PCDLesson.c b/Lessons/Lesson_29/UefiLessonsPkg/PCDLesson/PCDLesson.c
new file mode 100644
index 0000000..9e0aae0
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/PCDLesson/PCDLesson.c
@@ -0,0 +1,43 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+#include <Library/PcdLib.h>
+
+EFI_STATUS
+EFIAPI
+UefiMain (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  Print(L"PcdMyVar32=%d\n", FixedPcdGet32(PcdMyVar32));
+  Print(L"PcdMyVar32_1=%d\n", FixedPcdGet32(PcdMyVar32_1));
+  Print(L"PcdMyVar32_2=%d\n", FixedPcdGet32(PcdMyVar32_2));
+
+  Print(L"PcdMyVar32=%d\n", PcdGet32(PcdMyVar32));
+
+  Print(L"PcdMyPatchableVar32=0x%x\n", PcdGet32(PcdMyPatchableVar32));
+  RETURN_STATUS PcdStatus = PcdSet32S(PcdMyPatchableVar32, 44);
+  Print(L"PcdStatus=%r\n", PcdStatus);
+  Print(L"PcdMyPatchableVar32=%d\n", PcdGet32(PcdMyPatchableVar32));
+  PatchPcdSet32(PcdMyPatchableVar32, 45);
+  Print(L"PcdMyPatchableVar32=%d\n", PatchPcdGet32(PcdMyPatchableVar32));
+
+
+  Print(L"PcdMyFeatureFlagVar=%d\n", FeaturePcdGet(PcdMyFeatureFlagVar));
+  Print(L"PcdMyFeatureFlagVar=%d\n", PcdGetBool(PcdMyFeatureFlagVar));
+  Print(L"PcdMyVarBool=%d\n", FixedPcdGetBool(PcdMyVarBool));
+  Print(L"PcdMyVarBool=%d\n", PcdGetBool(PcdMyVarBool));
+  
+
+
+
+  Print(L"PcdMyDynamicExVar32=%x\n", PcdGet32(PcdMyDynamicExVar32));
+  PcdSet32S(PcdMyDynamicExVar32, 52);
+  Print(L"PcdMyDynamicExVar32=%x\n", PcdGet32(PcdMyDynamicExVar32));
+
+  Print(L"PcdMyDynamicVar32=%x\n", PcdGet32(PcdMyDynamicVar32));
+  PcdSet32S(PcdMyDynamicVar32, 52);
+  Print(L"PcdMyDynamicVar32=%x\n", PcdGet32(PcdMyDynamicVar32));
+  return EFI_SUCCESS;
+}
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/PCDLesson/PCDLesson.inf b/Lessons/Lesson_29/UefiLessonsPkg/PCDLesson/PCDLesson.inf
new file mode 100644
index 0000000..cfd39d2
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/PCDLesson/PCDLesson.inf
@@ -0,0 +1,39 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = PCDLesson
+  FILE_GUID                      = 8c1a6b71-0c4b-4497-aaad-07404edf142c
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = UefiMain
+
+[Sources]
+  PCDLesson.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  UefiLessonsPkg/UefiLessonsPkg.dec  
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
+
+[FixedPcd]
+  gUefiLessonsPkgTokenSpaceGuid.PcdMyVar32 
+  gUefiLessonsPkgTokenSpaceGuid.PcdMyVar32_1|43 
+  gUefiLessonsPkgTokenSpaceGuid.PcdMyVar32_2|43 
+  gUefiLessonsPkgTokenSpaceGuid.PcdMyVarBool 
+
+[PatchPcd]
+  gUefiLessonsPkgTokenSpaceGuid.PcdMyPatchableVar32 
+
+[FeaturePcd]
+  gUefiLessonsPkgTokenSpaceGuid.PcdMyFeatureFlagVar
+
+[Pcd]
+  gUefiLessonsPkgTokenSpaceGuid.PcdMyDynamicVar32
+  gUefiLessonsPkgTokenSpaceGuid.PcdMyDynamicVar32_1
+
+[PcdEx]
+  gUefiLessonsPkgTokenSpaceGuid.PcdMyDynamicExVar32
+
+
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/SaveBGRT/SaveBGRT.c b/Lessons/Lesson_29/UefiLessonsPkg/SaveBGRT/SaveBGRT.c
new file mode 100644
index 0000000..2fda8d8
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/SaveBGRT/SaveBGRT.c
@@ -0,0 +1,104 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+#include <Protocol/AcpiSystemDescriptionTable.h>
+#include <Library/ShellLib.h>
+#include <IndustryStandard/Bmp.h>
+
+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 it to %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;
+}
+
+EFI_STATUS
+EFIAPI
+UefiMain (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_ACPI_SDT_PROTOCOL* AcpiSdtProtocol;
+  EFI_STATUS Status = gBS->LocateProtocol (
+                  &gEfiAcpiSdtProtocolGuid,
+                  NULL,
+                  (VOID**)&AcpiSdtProtocol
+                  );
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  BOOLEAN BGRT_found = FALSE;
+  UINTN Index = 0;
+  EFI_ACPI_SDT_HEADER* Table;
+  EFI_ACPI_TABLE_VERSION Version;
+  UINTN TableKey;
+  while (TRUE) {
+    Status = AcpiSdtProtocol->GetAcpiTable(Index,
+      &Table,
+      &Version,
+      &TableKey
+    );
+    if (EFI_ERROR(Status)) {
+      break;
+    }
+    if (((CHAR8)((Table->Signature >>  0) & 0xFF) == 'B') &&
+        ((CHAR8)((Table->Signature >>  8) & 0xFF) == 'G') &&
+        ((CHAR8)((Table->Signature >> 16) & 0xFF) == 'R') &&
+        ((CHAR8)((Table->Signature >> 24) & 0xFF) == 'T')) {
+      BGRT_found = TRUE;
+      break;
+    }
+    Index++;
+  }
+  if (!BGRT_found) {
+    Print(L"BGRT table is not present in the system\n");
+    return EFI_UNSUPPORTED;
+  }
+
+  EFI_ACPI_6_3_BOOT_GRAPHICS_RESOURCE_TABLE* BGRT = (EFI_ACPI_6_3_BOOT_GRAPHICS_RESOURCE_TABLE*)Table;
+  if (BGRT->ImageType == 0) {
+    BMP_IMAGE_HEADER* BMP = (BMP_IMAGE_HEADER*)(BGRT->ImageAddress);
+
+    if ((BMP->CharB != 'B') || (BMP->CharM != 'M')) {
+      Print(L"BMP image has wrong signature!\n");
+      return EFI_UNSUPPORTED;
+    }
+    Print(L"BGRT conatins BMP image with %dx%d resolution\n", BMP->PixelWidth, BMP->PixelHeight);
+    UINTN Size = BMP->Size;
+    Status = WriteFile(L"BGRT.bmp", BMP, &Size);
+    if (EFI_ERROR(Status)) {
+      Print(L"Error! Can't write BGRT.bmp file\n");
+    }
+  }
+  return Status;
+}
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/SaveBGRT/SaveBGRT.inf b/Lessons/Lesson_29/UefiLessonsPkg/SaveBGRT/SaveBGRT.inf
new file mode 100644
index 0000000..93ab1b9
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/SaveBGRT/SaveBGRT.inf
@@ -0,0 +1,23 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = SaveBGRT
+  FILE_GUID                      = efe33e23-b17c-42b2-9551-87546f215935
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = UefiMain
+
+[Sources]
+  SaveBGRT.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  ShellPkg/ShellPkg.dec
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
+  ShellLib
+
+[Protocols]
+  gEfiAcpiSdtProtocolGuid
+
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/ShowBootVariables/ShowBootVariables.c b/Lessons/Lesson_29/UefiLessonsPkg/ShowBootVariables/ShowBootVariables.c
new file mode 100644
index 0000000..7f6b58c
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/ShowBootVariables/ShowBootVariables.c
@@ -0,0 +1,93 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+#include <Library/MemoryAllocationLib.h>
+#include <Library/UefiRuntimeServicesTableLib.h>
+
+#include <Library/DevicePathLib.h>
+#include <Library/PrintLib.h>
+
+
+EFI_STATUS
+GetNvramVariable( CHAR16   *VariableName,
+                  EFI_GUID *VariableOwnerGuid, 
+                  VOID     **Buffer,
+                  UINTN    *BufferSize)
+{
+    UINTN Size = 0;
+    *BufferSize = 0;
+
+    EFI_STATUS Status = gRT->GetVariable(VariableName, VariableOwnerGuid, NULL, &Size, NULL);
+    if (Status != EFI_BUFFER_TOO_SMALL) {
+        Print(L"Error! 'gRT->GetVariable' call returned %r\n", Status);
+        return Status;
+    }
+
+    *Buffer = AllocateZeroPool(Size);
+    if (!Buffer) {
+        Print(L"Error! 'AllocateZeroPool' call returned %r\n", Status);
+        return EFI_OUT_OF_RESOURCES;
+    }
+
+    Status = gRT->GetVariable(VariableName, VariableOwnerGuid, NULL, &Size, *Buffer);
+    if (Status == EFI_SUCCESS) {
+        *BufferSize = Size;
+    } else {
+        FreePool( *Buffer );
+        *Buffer = NULL;
+    }
+
+    return Status;
+}
+
+
+VOID PrintBootOption(CHAR16* BootOptionName)
+{
+  UINTN OptionSize;
+  UINT8* Buffer;
+ 
+  EFI_STATUS Status = GetNvramVariable(BootOptionName, &gEfiGlobalVariableGuid, (VOID**)&Buffer, &OptionSize);
+  if (Status == EFI_SUCCESS) {
+      EFI_LOAD_OPTION* LoadOption = (EFI_LOAD_OPTION*) Buffer;
+      CHAR16* Description = (CHAR16*)(Buffer + sizeof (EFI_LOAD_OPTION));
+      UINTN DescriptionSize = StrSize(Description);
+
+      Print(L"%s\n", Description);
+      if (LoadOption->FilePathListLength != 0) {
+        VOID* FilePathList = (UINT8 *)Description + DescriptionSize;
+        CHAR16* DevPathString = ConvertDevicePathToText(FilePathList, TRUE, FALSE);
+        Print(L"%s\n", DevPathString);
+      }
+  } else {
+    Print(L"Can't get %s variable\n", BootOptionName);
+  }
+}
+
+
+INTN EFIAPI ShellAppMain(IN UINTN Argc, IN CHAR16 **Argv)
+{
+  UINTN OptionSize;
+  EFI_STATUS Status;
+
+  UINT16* BootCurrent;
+  Status = GetNvramVariable(L"BootCurrent", &gEfiGlobalVariableGuid, (VOID**)&BootCurrent, &OptionSize);
+  if (Status != EFI_SUCCESS) {
+    Print(L"Can't get BootCurrent variable\n");
+  }
+
+  UINT16* BootOrderArray;
+  Status = GetNvramVariable(L"BootOrder", &gEfiGlobalVariableGuid, (VOID**)&BootOrderArray, &OptionSize);
+  if (Status == EFI_SUCCESS) {
+    for (UINTN i=0; i<(OptionSize/sizeof(UINT16)); i++) {
+      CHAR16 BootOptionStr[sizeof("Boot####")+1];
+      UnicodeSPrint(BootOptionStr, (sizeof("Boot####")+1)*sizeof(CHAR16), L"Boot%04x", BootOrderArray[i]);
+      Print(L"%s%s\n", BootOptionStr, (BootOrderArray[i] == *BootCurrent)? L"*" : L"" );
+      PrintBootOption(BootOptionStr);
+      Print(L"\n");
+    }
+  } else {
+    Print(L"Can't get BootOrder variable\n");
+  }
+
+  return EFI_SUCCESS;
+}
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/ShowBootVariables/ShowBootVariables.inf b/Lessons/Lesson_29/UefiLessonsPkg/ShowBootVariables/ShowBootVariables.inf
new file mode 100644
index 0000000..d2cfba9
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/ShowBootVariables/ShowBootVariables.inf
@@ -0,0 +1,19 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = ShowBootVariables
+  FILE_GUID                      = 31266d12-9c60-478e-905e-05d117a3a9df
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = ShellCEntryLib
+
+[Sources]
+  ShowBootVariables.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
+  ShellCEntryLib
+
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/ShowTables/ShowTables.c b/Lessons/Lesson_29/UefiLessonsPkg/ShowTables/ShowTables.c
new file mode 100644
index 0000000..aa32f41
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/ShowTables/ShowTables.c
@@ -0,0 +1,16 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+EFI_STATUS
+EFIAPI
+UefiMain (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  for (UINTN i=0; i<SystemTable->NumberOfTableEntries; i++) {
+    Print(L"%g, %p\n", SystemTable->ConfigurationTable[i].VendorGuid,
+                       SystemTable->ConfigurationTable[i].VendorTable);
+  }
+  return EFI_SUCCESS;
+}
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/ShowTables/ShowTables.inf b/Lessons/Lesson_29/UefiLessonsPkg/ShowTables/ShowTables.inf
new file mode 100644
index 0000000..056b823
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/ShowTables/ShowTables.inf
@@ -0,0 +1,18 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = ShowTables
+  FILE_GUID                      = e249532c-d41a-4bd9-a4a8-7fc143e703f2
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = UefiMain
+
+[Sources]
+  ShowTables.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
+
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/SimpleShellApp/SimpleShellApp.c b/Lessons/Lesson_29/UefiLessonsPkg/SimpleShellApp/SimpleShellApp.c
new file mode 100644
index 0000000..b13aa6c
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/SimpleShellApp/SimpleShellApp.c
@@ -0,0 +1,14 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+INTN EFIAPI ShellAppMain(IN UINTN Argc, IN CHAR16 **Argv)
+{
+//  SystemTable->ConOut->OutputString(SystemTable->ConOut, L"Hello World!\n");
+  gST->ConOut->OutputString(gST->ConOut, L"Hello again!\n");
+  Print(L"Bye!\n");
+
+  for (UINTN i=Argc; i>0; i--) {
+    Print(L"Arg[%d]=%s\n", Argc-i, Argv[Argc-i]);
+  }
+  return 0;
+}
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/SimpleShellApp/SimpleShellApp.inf b/Lessons/Lesson_29/UefiLessonsPkg/SimpleShellApp/SimpleShellApp.inf
new file mode 100644
index 0000000..013bf4e
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/SimpleShellApp/SimpleShellApp.inf
@@ -0,0 +1,19 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = SimpleShellApp
+  FILE_GUID                      = 2afd1202-545e-4f8d-b8fb-bc179e84ddc8
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = ShellCEntryLib
+
+[Sources]
+  SimpleShellApp.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
+  ShellCEntryLib
+
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/SimplestApp/SimplestApp.c b/Lessons/Lesson_29/UefiLessonsPkg/SimplestApp/SimplestApp.c
new file mode 100644
index 0000000..8bdf500
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/SimplestApp/SimplestApp.c
@@ -0,0 +1,10 @@
+EFI_STATUS
+EFIAPI
+UefiMain (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  return EFI_SUCCESS;
+}
+
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/SimplestApp/SimplestApp.inf b/Lessons/Lesson_29/UefiLessonsPkg/SimplestApp/SimplestApp.inf
new file mode 100644
index 0000000..7d4bae2
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/SimplestApp/SimplestApp.inf
@@ -0,0 +1,16 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = SimplestApp
+  FILE_GUID                      = 4a298956-fbe0-47fb-ae3a-2d5a0a959a26
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = UefiMain
+
+[Sources]
+  SimplestApp.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
diff --git a/Lessons/Lesson_29/UefiLessonsPkg/UefiLessonsPkg.dec b/Lessons/Lesson_29/UefiLessonsPkg/UefiLessonsPkg.dec
new file mode 100644
index 0000000..38048bc
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/UefiLessonsPkg.dec
@@ -0,0 +1,35 @@
+[Defines]

+  DEC_SPECIFICATION              = 0x00010005

+  PACKAGE_NAME                   = UefiLessonsPkg

+  PACKAGE_GUID                   = 7e7edbba-ca2c-4177-a3f0-d3371358773a

+  PACKAGE_VERSION                = 1.01

+

+[Includes]

+

+[LibraryClasses]

+

+[Guids]

+  # FILE_GUID as defined in UefiLessonsPkg/HelloWorld/HelloWorld.inf

+  gHelloWorldFileGuid            = {0x2e55fa38, 0xf148, 0x42d3, {0xaf, 0x90, 0x1b, 0xe2, 0x47, 0x32, 0x3e, 0x30}}

+  gUefiLessonsPkgTokenSpaceGuid = {0x150cab53, 0xad47, 0x4385, {0xb5, 0xdd, 0xbc, 0xfc, 0x76, 0xba, 0xca, 0xf0}}

+

+[Protocols]

+

+[PcdsFixedAtBuild]

+  gUefiLessonsPkgTokenSpaceGuid.PcdMyVar32|42|UINT32|0x00000001

+  gUefiLessonsPkgTokenSpaceGuid.PcdMyVar32_1|42|UINT32|0x00000002

+  gUefiLessonsPkgTokenSpaceGuid.PcdMyVar32_2|42|UINT32|0x00000003

+  gUefiLessonsPkgTokenSpaceGuid.PcdMyVarBool|FALSE|BOOLEAN|0x00000004

+

+[PcdsPatchableInModule]

+  gUefiLessonsPkgTokenSpaceGuid.PcdMyPatchableVar32|0x31313131|UINT32|0x10000001

+

+[PcdsFeatureFlag]

+  gUefiLessonsPkgTokenSpaceGuid.PcdMyFeatureFlagVar|FALSE|BOOLEAN|0x20000001

+

+[PcdsDynamic]

+  gUefiLessonsPkgTokenSpaceGuid.PcdMyDynamicVar32|0x38323232|UINT32|0x30000001

+  gUefiLessonsPkgTokenSpaceGuid.PcdMyDynamicVar32_1|42|UINT32|0x30000002

+

+[PcdsDynamicEx]

+  gUefiLessonsPkgTokenSpaceGuid.PcdMyDynamicExVar32|0x38333333|UINT32|0x40000001

diff --git a/Lessons/Lesson_29/UefiLessonsPkg/UefiLessonsPkg.dsc b/Lessons/Lesson_29/UefiLessonsPkg/UefiLessonsPkg.dsc
new file mode 100644
index 0000000..5939fcc
--- /dev/null
+++ b/Lessons/Lesson_29/UefiLessonsPkg/UefiLessonsPkg.dsc
@@ -0,0 +1,50 @@
+[Defines]
+  DSC_SPECIFICATION              = 0x0001001C
+  PLATFORM_GUID                  = 3db7270f-ffac-4139-90a4-0ae68f3f8167
+  PLATFORM_VERSION               = 0.01
+  PLATFORM_NAME                  = UefiLessonsPkg
+  SKUID_IDENTIFIER               = DEFAULT
+  SUPPORTED_ARCHITECTURES        = X64
+  BUILD_TARGETS                  = RELEASE
+
+
+[LibraryClasses]
+  UefiApplicationEntryPoint|MdePkg/Library/UefiApplicationEntryPoint/UefiApplicationEntryPoint.inf
+  UefiBootServicesTableLib|MdePkg/Library/UefiBootServicesTableLib/UefiBootServicesTableLib.inf
+  DebugLib|MdePkg/Library/UefiDebugLibConOut/UefiDebugLibConOut.inf
+  BaseLib|MdePkg/Library/BaseLib/BaseLib.inf
+  #PcdLib|MdePkg/Library/BasePcdLibNull/BasePcdLibNull.inf
+  PcdLib|MdePkg/Library/DxePcdLib/DxePcdLib.inf
+  BaseMemoryLib|MdePkg/Library/BaseMemoryLib/BaseMemoryLib.inf
+  RegisterFilterLib|MdePkg/Library/RegisterFilterLibNull/RegisterFilterLibNull.inf
+  PrintLib|MdePkg/Library/BasePrintLib/BasePrintLib.inf
+  DebugPrintErrorLevelLib|MdePkg/Library/BaseDebugPrintErrorLevelLib/BaseDebugPrintErrorLevelLib.inf
+  UefiLib|MdePkg/Library/UefiLib/UefiLib.inf
+  MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
+  DevicePathLib|MdePkg/Library/UefiDevicePathLib/UefiDevicePathLib.inf
+  UefiRuntimeServicesTableLib|MdePkg/Library/UefiRuntimeServicesTableLib/UefiRuntimeServicesTableLib.inf
+  ShellCEntryLib|ShellPkg/Library/UefiShellCEntryLib/UefiShellCEntryLib.inf
+  ShellLib|ShellPkg/Library/UefiShellLib/UefiShellLib.inf
+  FileHandleLib|MdePkg/Library/UefiFileHandleLib/UefiFileHandleLib.inf  
+  HiiLib|MdeModulePkg/Library/UefiHiiLib/UefiHiiLib.inf
+  SortLib|MdeModulePkg/Library/UefiSortLib/UefiSortLib.inf
+  UefiHiiServicesLib|MdeModulePkg/Library/UefiHiiServicesLib/UefiHiiServicesLib.inf
+
+[Components]
+  UefiLessonsPkg/SimplestApp/SimplestApp.inf
+  UefiLessonsPkg/HelloWorld/HelloWorld.inf
+  UefiLessonsPkg/ImageHandle/ImageHandle.inf
+  UefiLessonsPkg/ImageInfo/ImageInfo.inf
+  UefiLessonsPkg/MemoryInfo/MemoryInfo.inf
+  UefiLessonsPkg/SimpleShellApp/SimpleShellApp.inf
+  UefiLessonsPkg/ListVariables/ListVariables.inf
+  UefiLessonsPkg/ShowBootVariables/ShowBootVariables.inf
+  UefiLessonsPkg/InteractiveApp/InteractiveApp.inf
+  UefiLessonsPkg/PCDLesson/PCDLesson.inf
+  UefiLessonsPkg/ShowTables/ShowTables.inf
+  UefiLessonsPkg/AcpiInfo/AcpiInfo.inf
+  UefiLessonsPkg/SaveBGRT/SaveBGRT.inf
+
+[PcdsFixedAtBuild]
+  gUefiLessonsPkgTokenSpaceGuid.PcdMyVar32_2|44
+