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authorKonstantin Aladyshev <aladyshev22@gmail.com>2021-06-19 21:03:52 +0300
committerKonstantin Aladyshev <aladyshev22@gmail.com>2021-06-19 21:07:18 +0300
commit949552d025a5968b3fd3e8d0ab399c9a85232def (patch)
tree8af798e27d6c609754379967551ccf666915ccd5 /Lesson_03
parent722c0444a133c4b7f0a3ce49d6990ecaf14cdcf4 (diff)
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Rename lesson numbers to XX notation
With XX notation lessons would be placed in a folder from first to last.
Diffstat (limited to 'Lesson_03')
-rw-r--r--Lesson_03/README.md168
-rw-r--r--Lesson_03/UefiLessonsPkg/HelloWorld/HelloWorld.c10
-rw-r--r--Lesson_03/UefiLessonsPkg/HelloWorld/HelloWorld.inf17
-rw-r--r--Lesson_03/UefiLessonsPkg/SimplestApp/SimplestApp.c10
-rw-r--r--Lesson_03/UefiLessonsPkg/SimplestApp/SimplestApp.inf16
-rw-r--r--Lesson_03/UefiLessonsPkg/UefiLessonsPkg.dsc26
6 files changed, 247 insertions, 0 deletions
diff --git a/Lesson_03/README.md b/Lesson_03/README.md
new file mode 100644
index 0000000..f0aef2e
--- /dev/null
+++ b/Lesson_03/README.md
@@ -0,0 +1,168 @@
+Finally we are ready to write our "Hello World" app.
+
+First we create a new edk2 module in our package directory similar to the our `SimplestApp` module:
+```
+$ mkdir UefiLessonsPkg/HelloWorld
+$ vi UefiLessonsPkg/HelloWorld/HelloWorld.inf
+[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
+```
+Don't forget to add our newly created app to the `Components` section of the package DSC file
+```
+[Components]
+ UefiLessonsPkg/SimplestApp/SimplestApp.inf
++ UefiLessonsPkg/HelloWorld/HelloWorld.inf
+```
+Next we need to write the source code file. Let's remember the code for our SimplestApp:
+```
+EFI_STATUS
+EFIAPI
+UefiMain (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ return EFI_SUCCESS;
+}
+```
+To print something to the console ("Hello World" message in our case) we need to use services from the `EFI_SYSTEM_TABLE` that is passed to the entry point of our app.
+
+The description of the `EFI_SYSTEM_TABLE` can be found in the UEFI specification (https://uefi.org/sites/default/files/resources/UEFI_Spec_2_8_final.pdf).
+
+EFI_SYSTEM_TABLE is a struct that was populated by the UEFI firmware and contains pointers to the runtime and boot services tables.
+```
+typedef struct {
+ EFI_TABLE_HEADER Hdr;
+ CHAR16 *FirmwareVendor;
+ UINT32 FirmwareRevision;
+ EFI_HANDLE ConsoleInHandle;
+ EFI_SIMPLE_TEXT_INPUT_PROTOCOL *ConIn;
+ EFI_HANDLE ConsoleOutHandle;
+ EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *ConOut;
+ EFI_HANDLE StandardErrorHandle;
+ EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *StdErr;
+ EFI_RUNTIME_SERVICES *RuntimeServices;
+ EFI_BOOT_SERVICES *BootServices;
+ UINTN NumberOfTableEntries;
+ EFI_CONFIGURATION_TABLE *ConfigurationTable;
+} EFI_SYSTEM_TABLE;
+```
+We are interested in the `ConOut` field. `ConOut` is abbreviaton for "Console Output" and according to the UEFI spec it is a pointer to the `EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL` interface that is associated with `ConsoleOutHandle`.
+
+If we keep digging into UEFI spec we can find description of the `EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL`.
+According to the spec `EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL` defines the minimum requirements for a text-based ConsoleOut device.
+
+As everything in UEFI it has GUID:
+```
+#define EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL_GUID \
+ {0x387477c2,0x69c7,0x11d2,\
+ {0x8e,0x39,0x00,0xa0,0xc9,0x69,0x72,0x3b}}
+```
+
+And the interface description is:
+```
+typedef struct _EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL {
+ EFI_TEXT_RESET Reset;
+ EFI_TEXT_STRING OutputString;
+ EFI_TEXT_TEST_STRING TestString;
+ EFI_TEXT_QUERY_MODE QueryMode;
+ EFI_TEXT_SET_MODE SetMode;
+ EFI_TEXT_SET_ATTRIBUTE SetAttribute;
+ EFI_TEXT_CLEAR_SCREEN ClearScreen;
+ EFI_TEXT_SET_CURSOR_POSITION SetCursorPosition;
+ EFI_TEXT_ENABLE_CURSOR EnableCursor;
+ SIMPLE_TEXT_OUTPUT_MODE *Mode;
+} EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL;
+```
+Right now we are interested in a `OutputString` method:
+```
+OutputString Displays the string on the device at the current cursor location.
+```
+This is what we need. Let's look at the function description:
+```
+EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.OutputString()
+
+Summary
+Writes a string to the output device.
+
+Prototype
+typedef
+EFI_STATUS
+(EFIAPI *EFI_TEXT_STRING) (
+ IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This,
+ IN CHAR16 *String
+ );
+
+Parameters
+This A pointer to the EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL instance.
+String The Null-terminated string to be displayed on the output device(s).
+```
+
+In edk2 `EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL` is defined in the header file:
+https://github.com/tianocore/edk2/blob/master/MdePkg/Include/Protocol/SimpleTextOut.h
+
+
+With all this knowledge we can write our source code file `UefiLessonsPkg/HelloWorld/HelloWorld.c`:
+```
+EFI_STATUS
+EFIAPI
+UefiMain (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ SystemTable->ConOut->OutputString(SystemTable->ConOut, L"Hello World!\n");
+ return EFI_SUCCESS;
+}
+```
+
+The `L""` signifies that the string is composed from CHAR16 symbols, as was required in spec.
+
+Let's compile our edk2 module:
+```
+$ build --platform=UefiLessonsPkg/UefiLessonsPkg.dsc \
+ --module=UefiLessonsPkg/HelloWorld/HelloWorld.inf \
+ --arch=X64 \
+ --buildtarget=RELEASE --tagname=GCC5
+```
+
+Copy the app to our `UEFI_disk` folder and run OVMF:
+```
+$ cp Build/UefiLessonsPkg/RELEASE_GCC5/X64/HelloWorld.efi ~/UEFI_disk/
+$ qemu-system-x86_64 -drive if=pflash,format=raw,file=Build/OvmfX64/RELEASE_GCC5/FV/OVMF.fd \
+ -drive format=raw,file=fat:rw:~/UEFI_disk \
+ -nographic \
+ -net none
+```
+
+```
+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.
+Shell> fs0:
+FS0:\> HelloWorld.efi
+Hello World!
+FS0:\>
+```
diff --git a/Lesson_03/UefiLessonsPkg/HelloWorld/HelloWorld.c b/Lesson_03/UefiLessonsPkg/HelloWorld/HelloWorld.c
new file mode 100644
index 0000000..399b0ac
--- /dev/null
+++ b/Lesson_03/UefiLessonsPkg/HelloWorld/HelloWorld.c
@@ -0,0 +1,10 @@
+EFI_STATUS
+EFIAPI
+UefiMain (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ SystemTable->ConOut->OutputString(SystemTable->ConOut, L"Hello World!\n");
+ return EFI_SUCCESS;
+}
diff --git a/Lesson_03/UefiLessonsPkg/HelloWorld/HelloWorld.inf b/Lesson_03/UefiLessonsPkg/HelloWorld/HelloWorld.inf
new file mode 100644
index 0000000..95924c5
--- /dev/null
+++ b/Lesson_03/UefiLessonsPkg/HelloWorld/HelloWorld.inf
@@ -0,0 +1,17 @@
+[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
+
diff --git a/Lesson_03/UefiLessonsPkg/SimplestApp/SimplestApp.c b/Lesson_03/UefiLessonsPkg/SimplestApp/SimplestApp.c
new file mode 100644
index 0000000..8bdf500
--- /dev/null
+++ b/Lesson_03/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/Lesson_03/UefiLessonsPkg/SimplestApp/SimplestApp.inf b/Lesson_03/UefiLessonsPkg/SimplestApp/SimplestApp.inf
new file mode 100644
index 0000000..7d4bae2
--- /dev/null
+++ b/Lesson_03/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/Lesson_03/UefiLessonsPkg/UefiLessonsPkg.dsc b/Lesson_03/UefiLessonsPkg/UefiLessonsPkg.dsc
new file mode 100644
index 0000000..91a79e6
--- /dev/null
+++ b/Lesson_03/UefiLessonsPkg/UefiLessonsPkg.dsc
@@ -0,0 +1,26 @@
+[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
+ BaseMemoryLib|MdePkg/Library/BaseMemoryLib/BaseMemoryLib.inf
+ RegisterFilterLib|MdePkg/Library/RegisterFilterLibNull/RegisterFilterLibNull.inf
+ PrintLib|MdePkg/Library/BasePrintLib/BasePrintLib.inf
+ DebugPrintErrorLevelLib|MdePkg/Library/BaseDebugPrintErrorLevelLib/BaseDebugPrintErrorLevelLib.inf
+
+[Components]
+ UefiLessonsPkg/SimplestApp/SimplestApp.inf
+ UefiLessonsPkg/HelloWorld/HelloWorld.inf
+
+