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-rw-r--r--Lessons/Lesson_35/README.md416
-rw-r--r--Lessons/Lesson_35/UefiLessonsPkg/Include/Library/SimpleLibrary.h2
-rw-r--r--Lessons/Lesson_35/UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.c5
-rw-r--r--Lessons/Lesson_35/UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.inf15
-rw-r--r--Lessons/Lesson_35/UefiLessonsPkg/SimpleLibraryUser/SimpleLibraryUser.c16
-rw-r--r--Lessons/Lesson_35/UefiLessonsPkg/SimpleLibraryUser/SimpleLibraryUser.inf20
-rw-r--r--Lessons/Lesson_35/UefiLessonsPkg/UefiLessonsPkg.dec34
-rw-r--r--Lessons/Lesson_35/UefiLessonsPkg/UefiLessonsPkg.dsc59
8 files changed, 246 insertions, 321 deletions
diff --git a/Lessons/Lesson_35/README.md b/Lessons/Lesson_35/README.md
index def1314..f6d64ad 100644
--- a/Lessons/Lesson_35/README.md
+++ b/Lessons/Lesson_35/README.md
@@ -1,383 +1,157 @@
-If you'll search through ShellPkg library (https://github.com/tianocore/edk2/tree/master/ShellPkg/Library) you can notice that there is a folder `UefiShellAcpiViewCommandLib` (https://github.com/tianocore/edk2/tree/master/ShellPkg/Library/UefiShellAcpiViewCommandLib).
-This folder provides a library for the support of in-shell `acpiview` command. If you check the INF file, you'll see
-https://github.com/tianocore/edk2/blob/master/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.inf:
-```
-# Provides Shell 'acpiview' command functions
-```
-But if you try to execute `acpiview` in our current OVMF build, you'll notice that this command is not recognized:
-```
-FS0:\> acpiview
-'acpiview' is not recognized as an internal or external command, operable program, or script file.
-```
-We have 3 ways to use this 'acpiview' command functionality:
-- compile `acpiview` as a separate app and run it as an ordinary UEFI shell application
-- compile shell with 'acpiview' command in itself and run it under OVMF
-- update OVMF image with a shell that actually includes 'acpiview' command in itself
-
-# Compile `acpiview` as a separate app
+In this lesson we will try to create the most simple library.
-I guess it is the most easy way.
-
-It is possible to perform such thing with a help of https://github.com/tianocore/edk2/tree/master/ShellPkg/Application/AcpiViewApp
-
-If you look at the source file, you'll see that it is pretty simple, the main function just makes a library call to `ShellCommandRunAcpiView` function:
+Usually libraries are present in these directories:
```
-EFI_STATUS
-EFIAPI
-AcpiViewAppMain (
- IN EFI_HANDLE ImageHandle,
- IN EFI_SYSTEM_TABLE *SystemTable
- )
-{
- return ShellCommandRunAcpiView (gImageHandle, SystemTable);
-}
+<Pkg Name>/Library/<Library Name>/ <---- inf and source files for the library (=library implementation)
+<Pkg Name>/Include/Library/ <---- library headers (=library interface)
```
-To build this application issue:
+Create folders for our `SimpleLibrary`:
```
-build --platform=ShellPkg/ShellPkg.dsc --module=ShellPkg/Application/AcpiViewApp/AcpiViewApp.inf --arch=X64 --buildtarget=RELEASE --tagname=GCC5
+$ mkdir -p UefiLessonsPkg/Library/SimpleLibrary/
+$ mkdir -p UefiLessonsPkg/Include/Library/
```
-Copy image to the QEMU shared folder:
+First let's implement the header file, the interface for our library. Our `SimpleLibrary` would contain the only function `Plus2` that would receive a `number` and return a `number+2`.
+Therefore the content in the header file (`UefiLessonsPkg/Include/Library/SimpleLibrary.h`) would look like this:
```
-cp Build/Shell/RELEASE_GCC5/X64/AcpiViewApp.efi ~/UEFI_disk/
+UINTN Plus2(UINTN number);
```
-You can see application help with a:
+No harder the library implementation file `UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.c`:
```
-FS0:\> AcpiViewApp.efi -?
-Display ACPI Table information.
-
-ACPIVIEWAPP.EFI [[-?] | [[[[-l] | [-s AcpiTable [-d]]] [-q] [-h]] [-r Spec]]]
-
-
- -l - Display list of installed ACPI Tables.
- -s - Display only the specified AcpiTable type and only support single
- invocation option.
- AcpiTable : The required ACPI Table type.
- -d - Generate a binary file dump of the specified AcpiTable.
- -q - Quiet. Suppress errors and warnings. Disables consistency checks.
- -h - Enable colour highlighting.
- -r - Validate that all required ACPI tables are installed
- Spec : Specification to validate against.
- For Arm, the possible values are:
- 0 - Server Base Boot Requirements v1.0
- 1 - Server Base Boot Requirements v1.1
- 2 - Server Base Boot Requirements v1.2
- -? - Show help.
-
+#include <Library/SimpleLibrary.h>
- This program is provided to allow examination of ACPI table values from the
- UEFI Shell. This can help with investigations, especially at that stage
- where the tables are not enabling an OS to boot.
- The program is not exhaustive, and only encapsulates detailed knowledge of a
- limited number of table types.
-
- Default behaviour is to display the content of all tables installed.
- 'Known' table types (listed in NOTES below) will be parsed and displayed
- with descriptions and field values. Where appropriate a degree of
- consistency checking is done and errors may be reported in the output.
- Other table types will be displayed as an array of Hexadecimal bytes.
-
- To facilitate debugging, the -s and -d options can be used to generate a
- binary file image of a table that can be copied elsewhere for investigation
- using tools such as those provided by acpica.org. This is especially
- relevant for AML type tables like DSDT and SSDT.
-
-NOTES:
- 1. The AcpiTable parameter can match any installed table type.
- Tables without specific handling will be displayed as a raw hex dump (or
- dumped to a file if -d is used).
- 2. -s option supports to display the specified AcpiTable type that is present
- in the system. For normal type AcpiTable, it would display the data of the
- AcpiTable and AcpiTable header. The following type may contain header type
- other than AcpiTable header. The actual header can refer to the ACPI spec
- 6.3
- Extra A. Particular types:
- APIC - Multiple APIC Description Table (MADT)
- BGRT - Boot Graphics Resource Table
- DBG2 - Debug Port Table 2
- DSDT - Differentiated System Description Table
- FACP - Fixed ACPI Description Table (FADT)
- GTDT - Generic Timer Description Table
- IORT - IO Remapping Table
- MCFG - Memory Mapped Config Space Base Address Description Table
- PPTT - Processor Properties Topology Table
- RSDP - Root System Description Pointer
- SLIT - System Locality Information Table
- SPCR - Serial Port Console Redirection Table
- SRAT - System Resource Affinity Table
- SSDT - Secondary SystemDescription Table
- XSDT - Extended System Description Table
-
-
-
-EXAMPLES:
- * To display a list of the installed table types:
- fs0:\> acpiviewapp.efi -l
+UINTN Plus2(UINTN number) {
+ return number+2;
+}
+```
- * To parse and display a specific table type:
- fs0:\> acpiviewapp.efi -s GTDT
+This is really a simple library, it stands to its name!
- * To save a binary dump of the contents of a table to a file
- in the current working directory:
- fs0:\> acpiviewapp.efi -s DSDT -d
+Now we need to create an INF file for the library `UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.inf`:
+```
+[Defines]
+ INF_VERSION = 1.25
+ BASE_NAME = SimpleLibrary
+ FILE_GUID = 826c8951-5bd2-4d72-a9d9-f7ab48684117
+ MODULE_TYPE = UEFI_APPLICATION
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = SimpleLibrary | UEFI_APPLICATION
- * To display contents of all ACPI tables:
- fs0:\> acpiviewapp.efi
+[Sources]
+ SimpleLibrary.c
- * To check if all Server Base Boot Requirements (SBBR) v1.2 mandatory
- ACPI tables are installed (Arm only):
- fs0:\> acpiviewapp.efi -r 2
+[Packages]
+ MdePkg/MdePkg.dec
```
-With this program you can list ACPI tables in system:
+The interesting string here is the:
```
-FS0:\> AcpiViewApp.efi -l
-
-Installed Table(s):
- 1. RSDP
- 2. XSDT
- 3. FACP
- 4. FACS
- 5. DSDT
- 6. APIC
- 7. HPET
- 8. BGRT
+LIBRARY_CLASS = SimpleLibrary | UEFI_APPLICATION
```
-
-Show the content of any table:
+It says that this library can only be used in modules with a type `UEFI_APPLICATION`. If you would say here `DXE_DRIVER` and try to link it to some of you UEFI applications, build process would fail. The error message would look like this:
+```
+build.py...
+/home/kostr/tiano/edk2/UefiLessonsPkg/UefiLessonsPkg.dsc(...): error 1001: Module type [UEFI_APPLICATION] is not supported by library instance [/home/kostr/tiano/edk2/UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.inf]
+ consumed by [/home/kostr/tiano/edk2/UefiLessonsPkg/<path to your app inf file>]
```
-FS0:\> AcpiViewApp.efi -s BGRT
-
-
- --------------- BGRT Table ---------------
-
-Address : 0x7B77000
-Length : 56
-
-00000000 : 42 47 52 54 38 00 00 00 - 01 C5 49 4E 54 45 4C 20 BGRT8.....INTEL
-00000010 : 45 44 4B 32 20 20 20 20 - 02 00 00 00 20 20 20 20 EDK2 ....
-00000020 : 13 00 00 01 01 00 01 00 - 18 30 8B 06 00 00 00 00 .........0......
-00000030 : 2F 01 00 00 0F 01 00 00 /.......
-
-Table Checksum : OK
-
-BGRT :
- Signature : BGRT
- Length : 56
- Revision : 1
- Checksum : 0xC5
- Oem ID : INTEL
- Oem Table ID : EDK2
- Oem Revision : 0x2
- Creator ID :
- Creator Revision : 0x1000013
- Version : 0x1
- Status : 0x1
- Image Type : 0x0
- Image Address : 0x68B3018
- Image Offset X : 303
- Image Offset Y : 271
-Table Statistics:
- 0 Error(s)
- 0 Warning(s)
+Now we need to include our library to our package DSC file `UefiLessonsPkg/UefiLessonsPkg.dsc`, so it would get build on a package build:
+```
+[Components]
+ ...
+ UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.inf
```
-Or dump any ACPI table:
+But if you try to build our package now build would fail with a message:
```
-FS0:\> acpiview -s APIC -d
-Dumping ACPI table to : .\APIC0000.bin ... DONE.
+/home/kostr/tiano/edk2/UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.c:1:10: fatal error: Library/SimpleLibrary.h: No such file or directory
+ 1 | #include <Library/SimpleLibrary.h>
+ | ^~~~~~~~~~~~~~~~~~~~~~~~~
+compilation terminated.
```
-You can disassemble this image with `iasl -d <file>` like we did earlier.
+The reason of that is a fact that our `UefiLessonsPkg/Include/Library/` folder is not recognized by a build system as a place where headers might be.
+To fix it we need to add to our `UefiLessonsPkg/UefiLessonsPkg.dec` file `[Includes]` section:
+```
+[Includes]
+ Include
+```
-# Compile shell with 'acpiview' command in itself and run it under OVMF
+And include this `UefiLessonsPkg/UefiLessonsPkg.dec` file to the library module INF file section `[Packages]`:
+```
+[Packages]
+ MdePkg/MdePkg.dec
+ UefiLessonsPkg/UefiLessonsPkg.dec
+```
-This case is a little bit crazy, we would be running a shell applicaion inside the shell application.
+Now we are good, build would succeed.
-I guess this is not the usual case, but it will help you to know how to compile the shell image that you can actually use in your projects.
+# SimpleLibraryUser
-If you'll look at the https://github.com/tianocore/edk2/blob/master/ShellPkg/ShellPkg.dsc you'll see that if you build `ShellPkg`, you'll actually build two versions of the `Shell.inf`:
-- one would have general commands
-- another one would have all the commands
-```
-ShellPkg/Application/Shell/Shell.inf {
- <PcdsFixedAtBuild>
- gEfiShellPkgTokenSpaceGuid.PcdShellLibAutoInitialize|FALSE
- <LibraryClasses>
- NULL|ShellPkg/Library/UefiShellLevel2CommandsLib/UefiShellLevel2CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellLevel1CommandsLib/UefiShellLevel1CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellLevel3CommandsLib/UefiShellLevel3CommandsLib.inf
-fndef $(NO_SHELL_PROFILES)
- NULL|ShellPkg/Library/UefiShellDriver1CommandsLib/UefiShellDriver1CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellInstall1CommandsLib/UefiShellInstall1CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellDebug1CommandsLib/UefiShellDebug1CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellNetwork1CommandsLib/UefiShellNetwork1CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellNetwork2CommandsLib/UefiShellNetwork2CommandsLib.inf
-ndif #$(NO_SHELL_PROFILES)
-}
+Now let's create an application that would use our library.
-#
-# Build a second version of the shell with all commands integrated
-#
-ShellPkg/Application/Shell/Shell.inf {
- <Defines>
- FILE_GUID = EA4BB293-2D7F-4456-A681-1F22F42CD0BC
- <PcdsFixedAtBuild>
- gEfiShellPkgTokenSpaceGuid.PcdShellLibAutoInitialize|FALSE
- <LibraryClasses>
- NULL|ShellPkg/Library/UefiShellLevel2CommandsLib/UefiShellLevel2CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellLevel1CommandsLib/UefiShellLevel1CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellLevel3CommandsLib/UefiShellLevel3CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellDriver1CommandsLib/UefiShellDriver1CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellInstall1CommandsLib/UefiShellInstall1CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellDebug1CommandsLib/UefiShellDebug1CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellNetwork1CommandsLib/UefiShellNetwork1CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellNetwork2CommandsLib/UefiShellNetwork2CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.inf <------- acpiview is present in this Shell version
-}
+UefiLessonsPkg/SimpleLibraryUser/SimpleLibraryUser.c:
```
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
-In case you wonder how `UefiShellAcpiViewCommandLib.inf` registers new command take a look at its sources:
-
-https://github.com/tianocore/edk2/blob/master/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.inf
-```
-[Defines]
- INF_VERSION = 0x00010019
- BASE_NAME = UefiShellAcpiViewCommandLib
- FILE_GUID = FB5B305E-84F5-461F-940D-82D345757AFA
- MODULE_TYPE = UEFI_APPLICATION
- VERSION_STRING = 1.0
- LIBRARY_CLASS = AcpiViewCommandLib|UEFI_APPLICATION UEFI_DRIVER
- CONSTRUCTOR = UefiShellAcpiViewCommandLibConstructor
- DESTRUCTOR = UefiShellAcpiViewCommandLibDestructor
+#include <Library/SimpleLibrary.h>
- ...
-```
-https://github.com/tianocore/edk2/blob/master/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.c
-```
EFI_STATUS
EFIAPI
-UefiShellAcpiViewCommandLibConstructor (
+UefiMain (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
- ...
- // Install our Shell command handler
- ShellCommandRegisterCommandName (
- L"acpiview",
- ShellCommandRunAcpiView,
- ShellCommandGetManFileNameAcpiView,
- 0,
- L"acpiview",
- TRUE,
- gShellAcpiViewHiiHandle,
- STRING_TOKEN (STR_GET_HELP_ACPIVIEW)
- );
+ Print(L"%d\n", Plus2(3));
return EFI_SUCCESS;
}
```
-It doesn't look too scary, so you can even try to add your command to the shell. Maybe will try that in later lessons.
-Now execute this command to build the Shell application:
-```
-build --platform=ShellPkg/ShellPkg.dsc --module=ShellPkg/Application/Shell/Shell.inf --arch=X64 --buildtarget=RELEASE --tagname=GCC5
+UefiLessonsPkg/SimpleLibraryUser/SimpleLibraryUser.inf
```
+[Defines]
+ INF_VERSION = 1.25
+ BASE_NAME = SimpleLibraryUser
+ FILE_GUID = 22a1f57c-21ca-4011-9133-e3df0d01dace
+ MODULE_TYPE = UEFI_APPLICATION
+ VERSION_STRING = 1.0
+ ENTRY_POINT = UefiMain
-After the build there would be two files in the build folder:
-```
-$ ls Build/Shell/RELEASE_GCC5/X64/Shell*.efi
-Build/Shell/RELEASE_GCC5/X64/Shell_7C04A583-9E3E-4f1c-AD65-E05268D0B4D1.efi
-Build/Shell/RELEASE_GCC5/X64/Shell_EA4BB293-2D7F-4456-A681-1F22F42CD0BC.efi
-```
+[Sources]
+ SimpleLibraryUser.c
-If you look closely to the code from the `ShellPkg/ShellPkg.dsc` that I've pasted earlier, you can notice that the image that we need is an image with a `EA4BB293-2D7F-4456-A681-1F22F42CD0BC` guid.
+[Packages]
+ MdePkg/MdePkg.dec
+ UefiLessonsPkg/UefiLessonsPkg.dec <--- we need to include this for the same reason as in library INF file (for the header search)
-Copy it to the QEMU shared folder:
+[LibraryClasses]
+ UefiApplicationEntryPoint
+ UefiLib
+ SimpleLibrary <--- library is included as usual
```
-$ cp Build/Shell/RELEASE_GCC5/X64/Shell_EA4BB293-2D7F-4456-A681-1F22F42CD0BC.efi ~/UEFI_disk/
-```
-In your default shell there wouldn't be any `acpiview` command, but when as you'll move to the `Shell_EA4BB293-2D7F-4456-A681-1F22F42CD0BC.efi` this `acpiview` command would became present in the shell.
-```
-FS0:\> acpiview -l
-'acpiview' is not recognized as an internal or external command, operable program, or script file.
-FS0:\> Shell_EA4BB293-2D7F-4456-A681-1F22F42CD0BC.efi
-UEFI Interactive Shell v2.2
-EDK II
-UEFI v2.70 (EDK II, 0x00010000)
-Mapping table
- FS0: Alias(s):HD0a1:;BLK1:
- PciRoot(0x0)/Pci(0x1,0x1)/Ata(0x0)/HD(1,MBR,0xBE1AFDFA,0x3F,0xFBFC1)
- BLK0: Alias(s):
- PciRoot(0x0)/Pci(0x1,0x1)/Ata(0x0)
- BLK2: Alias(s):
- PciRoot(0x0)/Pci(0x1,0x1)/Ata(0x0)
-Press ESC in 4 seconds to skip startup.nsh or any other key to continue.
-FS0:\> acpiview -l
-Installed Table(s):
- 1. RSDP
- 2. XSDT
- 3. FACP
- 4. FACS
- 5. DSDT
- 6. APIC
- 7. HPET
- 8. BGRT
+Now add modifications to the `UefiLessonsPkg/UefiLessonsPkg.dsc`:
```
+[LibraryClasses]
+ ...
+ SimpleLibrary|UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.inf
-# Update OVMF image with a shell that actually includes 'acpiview' command in itself
-
-Correct `OvmfPkg/OvmfPkgX64.dsc`. You'll need to add `UefiShellAcpiViewCommandLib.inf` to the `Shell.inf` library classes:
-```
[Components]
...
- ShellPkg/Application/Shell/Shell.inf {
- <LibraryClasses>
- ShellCommandLib|ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.inf
- NULL|ShellPkg/Library/UefiShellLevel2CommandsLib/UefiShellLevel2CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellLevel1CommandsLib/UefiShellLevel1CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellLevel3CommandsLib/UefiShellLevel3CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellDriver1CommandsLib/UefiShellDriver1CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellDebug1CommandsLib/UefiShellDebug1CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellInstall1CommandsLib/UefiShellInstall1CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellNetwork1CommandsLib/UefiShellNetwork1CommandsLib.inf
- NULL|ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.inf <-----------
-!if $(NETWORK_IP6_ENABLE) == TRUE
- NULL|ShellPkg/Library/UefiShellNetwork2CommandsLib/UefiShellNetwork2CommandsLib.inf
-!endif
- HandleParsingLib|ShellPkg/Library/UefiHandleParsingLib/UefiHandleParsingLib.inf
- PrintLib|MdePkg/Library/BasePrintLib/BasePrintLib.inf
- BcfgCommandLib|ShellPkg/Library/UefiShellBcfgCommandLib/UefiShellBcfgCommandLib.inf
-
- <PcdsFixedAtBuild>
- gEfiMdePkgTokenSpaceGuid.PcdDebugPropertyMask|0xFF
- gEfiShellPkgTokenSpaceGuid.PcdShellLibAutoInitialize|FALSE
- gEfiMdePkgTokenSpaceGuid.PcdUefiLibMaxPrintBufferSize|8000
- }
+ UefiLessonsPkg/SimpleLibraryUser/SimpleLibraryUser.inf
```
+Here we've added implementation for our library class and added our new module to the package components.
-Rebuild OVMF:
-```
-build --platform=OvmfPkg/OvmfPkgX64.dsc --arch=X64 --buildtarget=RELEASE --tagname=GCC5
+If you build everything now and execute it under OVMF, you would get:
```
-
-You can test that this OVMF image has a shell that includes `acpiview` command in itself:
+FS0:\> SimpleLibraryUser.efi
+5
```
-FS0:\> acpiview -l
-Installed Table(s):
- 1. RSDP
- 2. XSDT
- 3. FACP
- 4. FACS
- 5. DSDT
- 6. APIC
- 7. HPET
- 8. BGRT
-```
+`3+2` is indeed `5`, so our library works correctly!
diff --git a/Lessons/Lesson_35/UefiLessonsPkg/Include/Library/SimpleLibrary.h b/Lessons/Lesson_35/UefiLessonsPkg/Include/Library/SimpleLibrary.h
new file mode 100644
index 0000000..105bc87
--- /dev/null
+++ b/Lessons/Lesson_35/UefiLessonsPkg/Include/Library/SimpleLibrary.h
@@ -0,0 +1,2 @@
+UINTN Plus2(UINTN number);
+
diff --git a/Lessons/Lesson_35/UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.c b/Lessons/Lesson_35/UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.c
new file mode 100644
index 0000000..acffba4
--- /dev/null
+++ b/Lessons/Lesson_35/UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.c
@@ -0,0 +1,5 @@
+#include <Library/SimpleLibrary.h>
+
+UINTN Plus2(UINTN number) {
+ return number+2;
+}
diff --git a/Lessons/Lesson_35/UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.inf b/Lessons/Lesson_35/UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.inf
new file mode 100644
index 0000000..92027a4
--- /dev/null
+++ b/Lessons/Lesson_35/UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.inf
@@ -0,0 +1,15 @@
+[Defines]
+ INF_VERSION = 1.25
+ BASE_NAME = SimpleLibrary
+ FILE_GUID = 826c8951-5bd2-4d72-a9d9-f7ab48684117
+ MODULE_TYPE = UEFI_APPLICATION
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = SimpleLibrary | UEFI_APPLICATION
+
+[Sources]
+ SimpleLibrary.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ UefiLessonsPkg/UefiLessonsPkg.dec
+
diff --git a/Lessons/Lesson_35/UefiLessonsPkg/SimpleLibraryUser/SimpleLibraryUser.c b/Lessons/Lesson_35/UefiLessonsPkg/SimpleLibraryUser/SimpleLibraryUser.c
new file mode 100644
index 0000000..9747b97
--- /dev/null
+++ b/Lessons/Lesson_35/UefiLessonsPkg/SimpleLibraryUser/SimpleLibraryUser.c
@@ -0,0 +1,16 @@
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+#include <Library/SimpleLibrary.h>
+
+EFI_STATUS
+EFIAPI
+UefiMain (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ Print(L"%d\n", Plus2(3));
+
+ return EFI_SUCCESS;
+}
diff --git a/Lessons/Lesson_35/UefiLessonsPkg/SimpleLibraryUser/SimpleLibraryUser.inf b/Lessons/Lesson_35/UefiLessonsPkg/SimpleLibraryUser/SimpleLibraryUser.inf
new file mode 100644
index 0000000..d7e5be8
--- /dev/null
+++ b/Lessons/Lesson_35/UefiLessonsPkg/SimpleLibraryUser/SimpleLibraryUser.inf
@@ -0,0 +1,20 @@
+[Defines]
+ INF_VERSION = 1.25
+ BASE_NAME = SimpleLibraryUser
+ FILE_GUID = 22a1f57c-21ca-4011-9133-e3df0d01dace
+ MODULE_TYPE = UEFI_APPLICATION
+ VERSION_STRING = 1.0
+ ENTRY_POINT = UefiMain
+
+[Sources]
+ SimpleLibraryUser.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ UefiLessonsPkg/UefiLessonsPkg.dec
+
+[LibraryClasses]
+ UefiApplicationEntryPoint
+ UefiLib
+ SimpleLibrary
+
diff --git a/Lessons/Lesson_35/UefiLessonsPkg/UefiLessonsPkg.dec b/Lessons/Lesson_35/UefiLessonsPkg/UefiLessonsPkg.dec
new file mode 100644
index 0000000..cc355aa
--- /dev/null
+++ b/Lessons/Lesson_35/UefiLessonsPkg/UefiLessonsPkg.dec
@@ -0,0 +1,34 @@
+[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]
+
+[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_35/UefiLessonsPkg/UefiLessonsPkg.dsc b/Lessons/Lesson_35/UefiLessonsPkg/UefiLessonsPkg.dsc
new file mode 100644
index 0000000..c42b57d
--- /dev/null
+++ b/Lessons/Lesson_35/UefiLessonsPkg/UefiLessonsPkg.dsc
@@ -0,0 +1,59 @@
+[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
+ SimpleLibrary|UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.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/GOPInfo/GOPInfo.inf
+ #UefiLessonsPkg/HiiMenu/HiiMenu.inf
+ #UefiLessonsPkg/TestGlyphs/TestGlyphs.inf
+ #UefiLessonsPkg/ShowHii/ShowHii.inf
+ UefiLessonsPkg/PCDLesson/PCDLesson.inf
+ UefiLessonsPkg/ShowTables/ShowTables.inf
+ UefiLessonsPkg/AcpiInfo/AcpiInfo.inf
+ UefiLessonsPkg/SaveBGRT/SaveBGRT.inf
+ UefiLessonsPkg/ListPCI/ListPCI.inf
+ UefiLessonsPkg/PCIRomInfo/PCIRomInfo.inf
+ UefiLessonsPkg/Library/SimpleLibrary/SimpleLibrary.inf
+ UefiLessonsPkg/SimpleLibraryUser/SimpleLibraryUser.inf
+
+[PcdsFixedAtBuild]
+ gUefiLessonsPkgTokenSpaceGuid.PcdMyVar32_2|44
+