Add 'UefiLessonsPkg' folder to the repo

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

34 files changed, 1608 insertions, 0 deletions

diff --git a/UefiLessonsPkg/AcpiInfo/AcpiInfo.c b/UefiLessonsPkg/AcpiInfo/AcpiInfo.c
new file mode 100644
index 0000000..88c78b6
--- /dev/null
+++ b/UefiLessonsPkg/AcpiInfo/AcpiInfo.c
@@ -0,0 +1,69 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+#include <Library/BaseMemoryLib.h>
+
+EFI_STATUS
+EFIAPI
+UefiMain (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  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);
+    Print(L"\t%c%c%c%c table is placed at address %p with length 0x%x\n", 
+                                             (CHAR8)((table->Signature>> 0)&0xFF),
+                                             (CHAR8)((table->Signature>> 8)&0xFF),
+                                             (CHAR8)((table->Signature>>16)&0xFF),
+                                             (CHAR8)((table->Signature>>24)&0xFF),
+                                             table,
+                                             table->Length);
+    offset += sizeof(UINT64);
+  }
+
+  return EFI_SUCCESS;
+}
diff --git a/UefiLessonsPkg/AcpiInfo/AcpiInfo.inf b/UefiLessonsPkg/AcpiInfo/AcpiInfo.inf
new file mode 100644
index 0000000..3884e76
--- /dev/null
+++ b/UefiLessonsPkg/AcpiInfo/AcpiInfo.inf
@@ -0,0 +1,21 @@
+[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
+
diff --git a/UefiLessonsPkg/HelloWorld/HelloWorld.c b/UefiLessonsPkg/HelloWorld/HelloWorld.c
new file mode 100644
index 0000000..29a4812
--- /dev/null
+++ b/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/UefiLessonsPkg/HelloWorld/HelloWorld.inf b/UefiLessonsPkg/HelloWorld/HelloWorld.inf
new file mode 100644
index 0000000..d65ca2e
--- /dev/null
+++ b/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/UefiLessonsPkg/ImageHandle/ImageHandle.c b/UefiLessonsPkg/ImageHandle/ImageHandle.c
new file mode 100644
index 0000000..32e9c43
--- /dev/null
+++ b/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/UefiLessonsPkg/ImageHandle/ImageHandle.inf b/UefiLessonsPkg/ImageHandle/ImageHandle.inf
new file mode 100644
index 0000000..34256ee
--- /dev/null
+++ b/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/UefiLessonsPkg/ImageInfo/ImageInfo.c b/UefiLessonsPkg/ImageInfo/ImageInfo.c
new file mode 100644
index 0000000..c45570e
--- /dev/null
+++ b/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/UefiLessonsPkg/ImageInfo/ImageInfo.inf b/UefiLessonsPkg/ImageInfo/ImageInfo.inf
new file mode 100644
index 0000000..0ce54a6
--- /dev/null
+++ b/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/UefiLessonsPkg/InteractiveApp/InteractiveApp.c b/UefiLessonsPkg/InteractiveApp/InteractiveApp.c
new file mode 100644
index 0000000..59c89a9
--- /dev/null
+++ b/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/UefiLessonsPkg/InteractiveApp/InteractiveApp.inf b/UefiLessonsPkg/InteractiveApp/InteractiveApp.inf
new file mode 100644
index 0000000..700b779
--- /dev/null
+++ b/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/UefiLessonsPkg/ListPCI/ListPCI.c b/UefiLessonsPkg/ListPCI/ListPCI.c
new file mode 100644
index 0000000..6eb2eef
--- /dev/null
+++ b/UefiLessonsPkg/ListPCI/ListPCI.c
@@ -0,0 +1,267 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+#include <Protocol/PciRootBridgeIo.h>
+#include <Library/MemoryAllocationLib.h>
+#include <IndustryStandard/Pci.h>
+#include <Library/ShellLib.h>
+#include <Library/PrintLib.h>
+
+
+#define DESCRIPTOR_STR_MAX_SIZE 200
+#define BLOCK_READ_SIZE (1024*4)
+
+VOID ToLowerASCII(CHAR8* Str, UINTN Size)
+{
+  for (UINT8 i=0; i<Size; i++) {
+    if ((Str[i]>='A')&&(Str[i]<='Z')) {
+      Str[i]+=32;
+    }
+  }
+}
+
+EFI_STATUS FindPCIDevDescription(UINT16 VendorId,
+                                 UINT16 DeviceId,
+                                 CHAR16* VendorDesc,
+                                 CHAR16* DeviceDesc,
+                                 UINTN DescBufferSize)
+{
+  EFI_STATUS Status = ShellFileExists(L"pci.ids");
+  if (EFI_ERROR(Status))
+  {
+    Print(L"No file pci.ids: %r\n", Status);
+    return Status;
+  }
+  
+  SHELL_FILE_HANDLE FileHandle;
+  Status = ShellOpenFileByName(L"pci.ids",
+                               &FileHandle,
+                               EFI_FILE_MODE_READ,
+                               0);
+  if (EFI_ERROR(Status))
+  {
+    Print(L"Can't open file pci.ids: %r\n", Status);
+    return Status;
+  }
+
+  UINT64 FileSize;
+  Status = ShellGetFileSize(FileHandle, &FileSize);
+  if (EFI_ERROR(Status))
+  {
+    Print(L"Can't get file size for file pci.ids: %r\n", Status);
+    goto end;
+  }
+
+  CHAR8 VendorStr[5];
+  CHAR8 DeviceStr[5];
+  AsciiValueToStringS(VendorStr,
+                      5,
+                      RADIX_HEX | PREFIX_ZERO,
+                      VendorId,
+                      4);
+  AsciiValueToStringS(DeviceStr,
+                      5,
+                      RADIX_HEX | PREFIX_ZERO,
+                      DeviceId,
+                      4);
+  ToLowerASCII(VendorStr, 4);
+  ToLowerASCII(DeviceStr, 4);
+
+  CHAR8 Buffer[BLOCK_READ_SIZE];
+  UINTN Size;
+  UINT64 FilePos = 0;
+  BOOLEAN Vendor_found = FALSE;
+  BOOLEAN Device_found = FALSE;
+  while (TRUE)
+  {
+    Size = BLOCK_READ_SIZE;
+    Status = ShellReadFile(FileHandle, &Size, Buffer);
+    if (EFI_ERROR(Status))
+    {
+      Print(L"Can't read file pci.ids: %r\n", Status);
+      goto end;
+    }
+    UINTN StrStart = 0;
+    UINTN StrEnd = 0;
+    for (UINTN i=0; i<Size; i++) {
+      if (Buffer[i]=='\n') {
+        StrEnd=i;
+        if (!Vendor_found){
+          // 0123456         7
+          //\nXXXX  |<desc>|\n
+          if ((StrEnd - StrStart) > 7) {
+            if ((Buffer[StrStart+1]==VendorStr[0]) &&
+                (Buffer[StrStart+2]==VendorStr[1]) &&
+                (Buffer[StrStart+3]==VendorStr[2]) &&
+                (Buffer[StrStart+4]==VendorStr[3])) {
+              Buffer[StrEnd] = 0;
+              UnicodeSPrintAsciiFormat(VendorDesc, DescBufferSize, "%a", &Buffer[StrStart+1+4+2]);
+              Vendor_found = TRUE;
+            }
+          }
+        } else {
+          // 0 1234567         8
+          //\n\tXXXX  |<desc>|\n
+          if ((StrEnd - StrStart) > 8) {
+            if ((Buffer[StrStart+1]=='\t') &&
+                (Buffer[StrStart+2]==DeviceStr[0]) &&
+                (Buffer[StrStart+3]==DeviceStr[1]) &&
+                (Buffer[StrStart+4]==DeviceStr[2]) &&
+                (Buffer[StrStart+5]==DeviceStr[3])) {
+              Buffer[StrEnd] = 0;
+              UnicodeSPrintAsciiFormat(DeviceDesc, DescBufferSize, "%a", &Buffer[StrStart+1+1+4+2]);
+              Device_found = TRUE;
+              break;
+            }
+          }
+        }
+        StrStart = StrEnd;
+      }
+    }
+
+    if (FilePos+Size >= FileSize) {
+      break;
+    }
+    FilePos += StrEnd;
+    Status = ShellSetFilePosition(FileHandle, FilePos);
+    if (EFI_ERROR(Status))
+    {
+      Print(L"Can't set file position pci.ids: %r\n", Status);
+      goto end;
+    }
+  }
+
+end:
+  if (!Vendor_found) {
+    UnicodeSPrint(VendorDesc, DescBufferSize, L"Undefined");
+  }
+  if (!Device_found) {
+    UnicodeSPrint(DeviceDesc, DescBufferSize, L"Undefined");
+  }
+  ShellCloseFile(&FileHandle);
+
+  return Status;
+}
+
+
+UINT64 PciConfigurationAddress(UINT8 Bus,
+                               UINT8 Device,
+                               UINT8 Function,
+                               UINT32 Register)
+{
+  UINT64 Address = (((UINT64)Bus) << 24) + (((UINT64)Device) << 16) + (((UINT64)Function) << 8);
+  if (Register & 0xFFFFFF00) {
+    Address += (((UINT64)Register) << 32);
+  } else {
+    Address += (((UINT64)Register) << 0);
+  }
+  return Address;
+}
+
+
+EFI_STATUS PrintRootBridge(EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL* PciRootBridgeIo)
+{
+  EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR* AddressDescriptor;
+  EFI_STATUS Status = PciRootBridgeIo->Configuration(
+                                         PciRootBridgeIo,
+                                         (VOID**)&AddressDescriptor
+                                       );
+  if (EFI_ERROR(Status)) {
+    Print(L"\tError! Can't get EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR: %r\n", Status);
+    return Status;
+  }
+  while (AddressDescriptor->Desc != ACPI_END_TAG_DESCRIPTOR) {
+    if (AddressDescriptor->ResType == ACPI_ADDRESS_SPACE_TYPE_BUS) {
+      for (UINT8 Bus = AddressDescriptor->AddrRangeMin; Bus <= AddressDescriptor->AddrRangeMax; Bus++) {
+        for (UINT8 Device = 0; Device <= PCI_MAX_DEVICE; Device++) {
+          for (UINT8 Func = 0; Func <= PCI_MAX_FUNC; Func++) {
+            UINT64 Address = PciConfigurationAddress(Bus, Device, Func, 0);
+            PCI_DEVICE_INDEPENDENT_REGION PCIConfHdr;
+            Status = PciRootBridgeIo->Pci.Read(
+              PciRootBridgeIo,
+              EfiPciWidthUint8,
+              Address,
+              sizeof(PCI_DEVICE_INDEPENDENT_REGION),
+              &PCIConfHdr
+            );
+            if (!EFI_ERROR(Status)) {
+              if (PCIConfHdr.VendorId != 0xffff) {
+                Print(L"\t%02x:%02x.%02x - Vendor:%04x, Device:%04x",
+                                                                        Bus,
+                                                                        Device,
+                                                                        Func,
+                                                                        PCIConfHdr.VendorId, 
+                                                                        PCIConfHdr.DeviceId);
+
+                CHAR16 VendorDesc[DESCRIPTOR_STR_MAX_SIZE];
+                CHAR16 DeviceDesc[DESCRIPTOR_STR_MAX_SIZE];
+                Status = FindPCIDevDescription(PCIConfHdr.VendorId,
+                                               PCIConfHdr.DeviceId,
+                                               VendorDesc,
+                                               DeviceDesc,
+                                               DESCRIPTOR_STR_MAX_SIZE);
+                if (!EFI_ERROR(Status)) {
+                  Print(L":    %s, %s\n", VendorDesc, DeviceDesc);
+                } else {
+                  Print(L"\n");
+                }
+              }
+            } else {
+              Print(L"\tError in PCI read: %r\n", Status);
+            }
+          }
+        }
+      }
+    }
+    AddressDescriptor++;
+  }
+  return Status;
+}
+
+EFI_STATUS
+EFIAPI
+UefiMain (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS             Status;
+  UINTN                  HandleCount;
+  EFI_HANDLE             *HandleBuffer;
+  Status = gBS->LocateHandleBuffer(
+                  ByProtocol,
+                  &gEfiPciRootBridgeIoProtocolGuid,
+                  NULL,
+                  &HandleCount,
+                  &HandleBuffer
+                );
+  if (EFI_ERROR (Status)) {
+    Print(L"Can't locate EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL: %r\n", Status);
+    return Status;
+  }
+
+  Print(L"Number of PCI root bridges in the system: %d\n", HandleCount);
+  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL* PciRootBridgeIo;
+  for (UINTN Index = 0; Index < HandleCount; Index++) {
+    Status = gBS->OpenProtocol (
+                    HandleBuffer[Index],
+                    &gEfiPciRootBridgeIoProtocolGuid,
+                    (VOID **)&PciRootBridgeIo,
+                    ImageHandle,
+                    NULL,
+                    EFI_OPEN_PROTOCOL_GET_PROTOCOL
+                  );
+    if (EFI_ERROR(Status)) {
+      Print(L"Can't open protocol: %r\n", Status);
+      return Status;
+    }
+    Print(L"\nPCI Root Bridge %d\n", Index);
+    Status = PrintRootBridge(PciRootBridgeIo);
+    if (EFI_ERROR(Status)) {
+      Print(L"Error in PCI Root Bridge printing\n");
+    }
+  }
+  FreePool(HandleBuffer);
+
+  return EFI_SUCCESS;
+}
diff --git a/UefiLessonsPkg/ListPCI/ListPCI.c:Zone.Identifier b/UefiLessonsPkg/ListPCI/ListPCI.c:Zone.Identifier
new file mode 100644
index 0000000..be537eb
--- /dev/null
+++ b/UefiLessonsPkg/ListPCI/ListPCI.c:Zone.Identifier
diff --git a/UefiLessonsPkg/ListPCI/ListPCI.inf b/UefiLessonsPkg/ListPCI/ListPCI.inf
new file mode 100644
index 0000000..0080d75
--- /dev/null
+++ b/UefiLessonsPkg/ListPCI/ListPCI.inf
@@ -0,0 +1,22 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = ListPCI
+  FILE_GUID                      = 07aceb78-97df-4e49-84a8-28997896e42a
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = UefiMain
+
+[Sources]
+  ListPCI.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  ShellPkg/ShellPkg.dec
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
+  ShellLib
+
+[Protocols]
+  gEfiPciRootBridgeIoProtocolGuid
diff --git a/UefiLessonsPkg/ListPCI/ListPCI.inf:Zone.Identifier b/UefiLessonsPkg/ListPCI/ListPCI.inf:Zone.Identifier
new file mode 100644
index 0000000..be537eb
--- /dev/null
+++ b/UefiLessonsPkg/ListPCI/ListPCI.inf:Zone.Identifier
diff --git a/UefiLessonsPkg/ListVariables/ListVariables.c b/UefiLessonsPkg/ListVariables/ListVariables.c
new file mode 100644
index 0000000..1f3ef4a
--- /dev/null
+++ b/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/UefiLessonsPkg/ListVariables/ListVariables.inf b/UefiLessonsPkg/ListVariables/ListVariables.inf
new file mode 100644
index 0000000..14e9fa2
--- /dev/null
+++ b/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/UefiLessonsPkg/MemoryInfo/MemoryInfo.c b/UefiLessonsPkg/MemoryInfo/MemoryInfo.c
new file mode 100644
index 0000000..8c3bcf2
--- /dev/null
+++ b/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/UefiLessonsPkg/MemoryInfo/MemoryInfo.inf b/UefiLessonsPkg/MemoryInfo/MemoryInfo.inf
new file mode 100644
index 0000000..777010d
--- /dev/null
+++ b/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/UefiLessonsPkg/PCDLesson/PCDLesson.c b/UefiLessonsPkg/PCDLesson/PCDLesson.c
new file mode 100644
index 0000000..03be437
--- /dev/null
+++ b/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=%d\n", PcdGet32(PcdMyPatchableVar32));
+  EFI_STATUS Status = PcdSet32S(PcdMyPatchableVar32, 44);
+  Print(L"Status=%r\n", Status);
+  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/UefiLessonsPkg/PCDLesson/PCDLesson.inf b/UefiLessonsPkg/PCDLesson/PCDLesson.inf
new file mode 100644
index 0000000..cfd39d2
--- /dev/null
+++ b/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/UefiLessonsPkg/ShowBootVariables/ShowBootVariables.c b/UefiLessonsPkg/ShowBootVariables/ShowBootVariables.c
new file mode 100644
index 0000000..7f6b58c
--- /dev/null
+++ b/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/UefiLessonsPkg/ShowBootVariables/ShowBootVariables.inf b/UefiLessonsPkg/ShowBootVariables/ShowBootVariables.inf
new file mode 100644
index 0000000..d2cfba9
--- /dev/null
+++ b/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/UefiLessonsPkg/ShowHii/ShowHii.c b/UefiLessonsPkg/ShowHii/ShowHii.c
new file mode 100644
index 0000000..27f23c3
--- /dev/null
+++ b/UefiLessonsPkg/ShowHii/ShowHii.c
@@ -0,0 +1,120 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+#include <Protocol/HiiDatabase.h>
+#include <Library/MemoryAllocationLib.h>
+
+
+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;
+    Print(L"PackageList[%d]: GUID=%g\n", i++, HiiPackageListHeader->PackageListGuid);
+
+    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)) {
+      Print(L"\tPackage[%d]: type=%s\n", j++, PackageType(HiiPackageHeader->Type));
+      // 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);
+  }
+}
+
+EFI_STATUS
+EFIAPI
+UefiMain (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS Status;
+  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/ShowHii/ShowHii.inf b/UefiLessonsPkg/ShowHii/ShowHii.inf
new file mode 100644
index 0000000..ec8ba46
--- /dev/null
+++ b/UefiLessonsPkg/ShowHii/ShowHii.inf
@@ -0,0 +1,22 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = ShowHii
+  FILE_GUID                      = 75a15862-aa04-47c2-a0ac-14a0a8bf5756
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = UefiMain
+
+[Sources]
+  ShowHii.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
+
+[Protocols]
+  gEfiHiiDatabaseProtocolGuid
+
+
diff --git a/UefiLessonsPkg/SimpleDriver/SimpleDriver.c b/UefiLessonsPkg/SimpleDriver/SimpleDriver.c
new file mode 100644
index 0000000..fd96d17
--- /dev/null
+++ b/UefiLessonsPkg/SimpleDriver/SimpleDriver.c
@@ -0,0 +1,26 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+
+EFI_STATUS
+EFIAPI
+SimpleDriverUnload (
+  EFI_HANDLE ImageHandle
+  )
+{
+  Print(L"Bye-bye from driver!\n");
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+SimpleDriverEntryPoint (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  Print(L"Hello from driver!\n");
+
+  return EFI_SUCCESS;
+}
diff --git a/UefiLessonsPkg/SimpleDriver/SimpleDriver.inf b/UefiLessonsPkg/SimpleDriver/SimpleDriver.inf
new file mode 100644
index 0000000..a6008c2
--- /dev/null
+++ b/UefiLessonsPkg/SimpleDriver/SimpleDriver.inf
@@ -0,0 +1,19 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = SimpleDriver
+  FILE_GUID                      = 384aeb18-105d-4af1-bf17-5e349e8f4d4c
+  MODULE_TYPE                    = UEFI_DRIVER
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = SimpleDriverEntryPoint
+  UNLOAD_IMAGE                   = SimpleDriverUnload
+
+[Sources]
+  SimpleDriver.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  UefiDriverEntryPoint
+  UefiLib
+
diff --git a/UefiLessonsPkg/SimpleShellApp/SimpleShellApp.c b/UefiLessonsPkg/SimpleShellApp/SimpleShellApp.c
new file mode 100644
index 0000000..b13aa6c
--- /dev/null
+++ b/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/UefiLessonsPkg/SimpleShellApp/SimpleShellApp.inf b/UefiLessonsPkg/SimpleShellApp/SimpleShellApp.inf
new file mode 100644
index 0000000..013bf4e
--- /dev/null
+++ b/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/UefiLessonsPkg/SimplestApp/SimplestApp.c b/UefiLessonsPkg/SimplestApp/SimplestApp.c
new file mode 100644
index 0000000..8bdf500
--- /dev/null
+++ b/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/UefiLessonsPkg/SimplestApp/SimplestApp.inf b/UefiLessonsPkg/SimplestApp/SimplestApp.inf
new file mode 100644
index 0000000..7d4bae2
--- /dev/null
+++ b/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/UefiLessonsPkg/SmbiosInfo/SmbiosInfo.c b/UefiLessonsPkg/SmbiosInfo/SmbiosInfo.c
new file mode 100644
index 0000000..b75026d
--- /dev/null
+++ b/UefiLessonsPkg/SmbiosInfo/SmbiosInfo.c
@@ -0,0 +1,88 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+#include <Library/BaseMemoryLib.h>
+#include <Protocol/Smbios.h>
+
+CHAR8* GetRecordString(EFI_SMBIOS_TABLE_HEADER* Record, UINTN number)
+{
+  if (!number)
+    return "";
+
+  CHAR8* String = (CHAR8*)Record + Record->Length;
+  UINTN i=1;
+  while (i < number) {
+    String = String + AsciiStrSize(String);
+    i++;
+  }
+  return String;
+}
+
+EFI_STATUS
+EFIAPI
+UefiMain (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  for (UINTN i=0; i<SystemTable->NumberOfTableEntries; i++) {
+    if (CompareGuid(&(SystemTable->ConfigurationTable[i].VendorGuid), &gEfiSmbiosTableGuid)) {
+      Print(L"SMBIOS table is placed at %p\n\n", SystemTable->ConfigurationTable[i].VendorTable);
+    }
+  } 
+
+  EFI_SMBIOS_PROTOCOL* SmbiosProtocol;
+  EFI_STATUS Status = gBS->LocateProtocol (
+                  &gEfiSmbiosProtocolGuid,
+                  NULL,
+                  (VOID**)&SmbiosProtocol
+                  );
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  EFI_SMBIOS_HANDLE SmbiosHandle = SMBIOS_HANDLE_PI_RESERVED;
+  EFI_SMBIOS_TABLE_HEADER* Record;
+  Status = SmbiosProtocol->GetNext(SmbiosProtocol,
+                                   &SmbiosHandle,
+                                   NULL,
+                                   &Record,
+                                   NULL);
+  while (!EFI_ERROR(Status)) {
+    Print (L"SMBIOS Type %d \n", Record->Type);
+    switch (Record->Type) {
+      case EFI_SMBIOS_TYPE_BIOS_INFORMATION: {
+        SMBIOS_TABLE_TYPE0* Type0Record = (SMBIOS_TABLE_TYPE0*) Record;
+        Print(L"\tVendor=%a\n", GetRecordString(Record, Type0Record->Vendor));
+        Print(L"\tBiosVersion=%a\n", GetRecordString(Record, Type0Record->BiosVersion));
+        Print(L"\tBiosReleaseDate=%a\n", GetRecordString(Record, Type0Record->BiosReleaseDate));
+        Print(L"\tBiosSegment=0x%x\n", Type0Record->BiosSegment);
+        Print(L"\tSystemBiosMajorRelease=0x%x\n", Type0Record->SystemBiosMajorRelease);
+        Print(L"\tSystemBiosMinorRelease=0x%x\n", Type0Record->SystemBiosMinorRelease);
+        break;
+      }
+      case EFI_SMBIOS_TYPE_SYSTEM_INFORMATION: {
+        SMBIOS_TABLE_TYPE1* Type1Record = (SMBIOS_TABLE_TYPE1*) Record;
+        Print(L"\tManufacturer=%a\n", GetRecordString(Record, Type1Record->Manufacturer));
+        Print(L"\tProductName=%a\n", GetRecordString(Record, Type1Record->ProductName));
+        Print(L"\tVersion=%a\n", GetRecordString(Record, Type1Record->Version));
+        Print(L"\tSerialNumber=%a\n", GetRecordString(Record, Type1Record->SerialNumber));
+        Print(L"\tUUID=%g\n", Type1Record->Uuid);
+        Print(L"\tWakeUpType=%d\n", Type1Record->WakeUpType);
+        Print(L"\tSKUNumber=%a\n", GetRecordString(Record, Type1Record->SKUNumber));
+        Print(L"\tFamily=%a\n", GetRecordString(Record, Type1Record->Family));
+        break;
+      }
+      default:
+        Print(L"\tTODO: Parsing for this table is not ready yet\n");
+        break;
+    }
+    Status = SmbiosProtocol->GetNext(SmbiosProtocol,
+                                     &SmbiosHandle,
+                                     NULL,
+                                     &Record,
+                                     NULL);
+  }
+  
+  return EFI_SUCCESS;
+}
diff --git a/UefiLessonsPkg/SmbiosInfo/SmbiosInfo.inf b/UefiLessonsPkg/SmbiosInfo/SmbiosInfo.inf
new file mode 100644
index 0000000..ab6013a
--- /dev/null
+++ b/UefiLessonsPkg/SmbiosInfo/SmbiosInfo.inf
@@ -0,0 +1,24 @@
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = SmbiosInfo
+  FILE_GUID                      = 4a8836db-9e1d-4b7d-a785-f552340fba59
+  MODULE_TYPE                    = UEFI_APPLICATION
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = UefiMain
+
+[Sources]
+  SmbiosInfo.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
+
+[Guids]
+  gEfiSmbiosTableGuid
+
+[Protocols]
+  gEfiSmbiosProtocolGuid
+
diff --git a/UefiLessonsPkg/UefiLessonsPkg.dec b/UefiLessonsPkg/UefiLessonsPkg.dec
new file mode 100644
index 0000000..8d14eec
--- /dev/null
+++ b/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]

+  Include

+

+[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]

+  gSimpleClassProtocolGuid = { 0xb5510eea, 0x6f11, 0x4e4b, { 0xad, 0x0f, 0x35, 0xce, 0x17, 0xbd, 0x7a, 0x67 }}

+

+[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/UefiLessonsPkg/UefiLessonsPkg.dsc b/UefiLessonsPkg/UefiLessonsPkg.dsc
new file mode 100644
index 0000000..0bb1762
--- /dev/null
+++ b/UefiLessonsPkg/UefiLessonsPkg.dsc
@@ -0,0 +1,63 @@
+[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
+  UefiDriverEntryPoint|MdePkg/Library/UefiDriverEntryPoint/UefiDriverEntryPoint.inf
+  #SimpleLibrary|UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.inf
+  #SimpleLibrary|UefiLessonsPkg/Library/SimpleLibraryWithConstructor/SimpleLibraryWithConstructor.inf
+  SimpleLibrary|UefiLessonsPkg/Library/SimpleLibraryWithConstructorAndDestructor/SimpleLibraryWithConstructorAndDestructor.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/SmbiosInfo/SmbiosInfo.inf
+  UefiLessonsPkg/ShowTables/ShowTables.inf
+  UefiLessonsPkg/AcpiInfo/AcpiInfo.inf
+  UefiLessonsPkg/SaveBGRT/SaveBGRT.inf
+  UefiLessonsPkg/ListPCI/ListPCI.inf
+  UefiLessonsPkg/SimpleDriver/SimpleDriver.inf
+  UefiLessonsPkg/PCIRomInfo/PCIRomInfo.inf
+  UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.inf
+  UefiLessonsPkg/Library/SimpleLibraryWithConstructor/SimpleLibraryWithConstructor.inf
+  UefiLessonsPkg/SimpleLibraryUser/SimpleLibraryUser.inf
+  UefiLessonsPkg/SimpleClassProtocol/SimpleClassProtocol.inf
+  UefiLessonsPkg/SimpleClassUser/SimpleClassUser.inf
+
+[PcdsFixedAtBuild]
+  gUefiLessonsPkgTokenSpaceGuid.PcdMyVar32_2|44
+