aboutsummaryrefslogtreecommitdiffstats
path: root/Lesson_22
diff options
context:
space:
mode:
authorKonstantin Aladyshev <aladyshev22@gmail.com>2021-07-10 00:04:40 +0300
committerKonstantin Aladyshev <aladyshev22@gmail.com>2021-07-10 00:04:40 +0300
commit6064c1e48b622f53538f4df9bdd402c607a87d51 (patch)
tree93d3c937b9568568307fd2ff7053a30c538ad72a /Lesson_22
parenta9c375c80c3505be794ec2b5d5bb90de27ef0d42 (diff)
downloadUEFI-Lessons-6064c1e48b622f53538f4df9bdd402c607a87d51.tar.gz
UEFI-Lessons-6064c1e48b622f53538f4df9bdd402c607a87d51.tar.bz2
UEFI-Lessons-6064c1e48b622f53538f4df9bdd402c607a87d51.zip
Move lessons to separate folder
Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
Diffstat (limited to 'Lesson_22')
-rw-r--r--Lesson_22/README.md117
1 files changed, 0 insertions, 117 deletions
diff --git a/Lesson_22/README.md b/Lesson_22/README.md
deleted file mode 100644
index 5280e72..0000000
--- a/Lesson_22/README.md
+++ /dev/null
@@ -1,117 +0,0 @@
-Let's explore another PCD type - feature flag PCD.
-
-Add PCD to DEC file UefiLessonsPkg/UefiLessonsPkg.dec:
-```
-[PcdsFeatureFlag]
- gUefiLessonsPkgTokenSpaceGuid.PcdMyFeatureFlagVar|FALSE|BOOLEAN|0x20000001
-```
-
-Populate it to INF UefiLessonsPkg/PCDLesson/PCDLesson.inf:
-```
-[FeaturePcd]
- gUefiLessonsPkgTokenSpaceGuid.PcdMyFeatureFlagVar
-```
-
-To get PCD value in a *.c file either `FeaturePcdGet` or `PcdGetBool` can be used which are practically the same https://github.com/tianocore/edk2/blob/master/MdePkg/Include/Library/PcdLib.h:
-```
-#define FeaturePcdGet(TokenName) _PCD_GET_MODE_BOOL_##TokenName
-#define PcdGetBool(TokenName) _PCD_GET_MODE_BOOL_##TokenName
-```
-Let's add both to our UefiLessonsPkg/PCDLesson/PCDLesson.c
-```
-Print(L"PcdMyFeatureFlagVar=%d\n", FeaturePcdGet(PcdMyFeatureFlagVar));
-Print(L"PcdMyFeatureFlagVar=%d\n", PcdGetBool(PcdMyFeatureFlagVar));
-```
-Ok, we are ready to build. Build your module and check out AutoGen files.
-
-Build/UefiLessonsPkg/RELEASE_GCC5/X64/UefiLessonsPkg/PCDLesson/PCDLesson/DEBUG/AutoGen.h
-```
-#define _PCD_TOKEN_PcdMyFeatureFlagVar 0U
-#define _PCD_SIZE_PcdMyFeatureFlagVar 1
-#define _PCD_GET_MODE_SIZE_PcdMyFeatureFlagVar _PCD_SIZE_PcdMyFeatureFlagVar
-#define _PCD_VALUE_PcdMyFeatureFlagVar ((BOOLEAN)0U)
-extern const BOOLEAN _gPcd_FixedAtBuild_PcdMyFeatureFlagVar;
-#define _PCD_GET_MODE_BOOL_PcdMyFeatureFlagVar _gPcd_FixedAtBuild_PcdMyFeatureFlagVar
-//#define _PCD_SET_MODE_BOOL_PcdMyFeatureFlagVar ASSERT(FALSE) // It is not allowed to set value for a FIXED_AT_BUILD PCD
-```
-
-Build/UefiLessonsPkg/RELEASE_GCC5/X64/UefiLessonsPkg/PCDLesson/PCDLesson/DEBUG/AutoGen.c
-```
-GLOBAL_REMOVE_IF_UNREFERENCED const BOOLEAN _gPcd_FixedAtBuild_PcdMyFeatureFlagVar = _PCD_VALUE_PcdMyFeatureFlagVar;
-```
-
-So both calls for our PCD would translate to:
-```
-FeaturePcdGet/PcdGetBool(PcdMyFeatureFlagVar) --> _PCD_GET_MODE_BOOL_PcdMyFeatureFlagVar --> _gPcd_FixedAtBuild_PcdMyFeatureFlagVar
-```
-And this variable is declared in AutoGen.c file:
-```
-GLOBAL_REMOVE_IF_UNREFERENCED const BOOLEAN _gPcd_FixedAtBuild_PcdMyFeatureFlagVar = ((BOOLEAN)0U);
-```
-
-If you execute it under OVMF these print statements would get you:
-```
-PcdMyFeatureFlagVar=0
-PcdMyFeatureFlagVar=0
-```
-
-________________________
-
-So as you can see a feature PCD is similar to a BOOLEAN PCD defined under `PcdsFixedAtBuild` section
-
-Let's create a fixed bool PCD and compare results:
-
-UefiLessonsPkg/UefiLessonsPkg.dec:
-```
-[PcdsFixedAtBuild]
- ...
- gUefiLessonsPkgTokenSpaceGuid.PcdMyVarBool|FALSE|BOOLEAN|0x00000004
-
-[PcdsFeatureFlag]
- gUefiLessonsPkgTokenSpaceGuid.PcdMyFeatureFlagVar|FALSE|BOOLEAN|0x20000001
-```
-UefiLessonsPkg/PCDLesson/PCDLesson.inf:
-```
-[FixedPcd]
- ...
- gUefiLessonsPkgTokenSpaceGuid.PcdMyVarBool
-
-[FeaturePcd]
- gUefiLessonsPkgTokenSpaceGuid.PcdMyFeatureFlagVar
-```
-UefiLessonsPkg/PCDLesson/PCDLesson.c:
-```
-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));
-```
-
-Ok, now let's build and look at AutoGen files:
-
-AutoGen.c
-```
-GLOBAL_REMOVE_IF_UNREFERENCED const BOOLEAN _gPcd_FixedAtBuild_PcdMyVarBool = _PCD_VALUE_PcdMyVarBool;
-GLOBAL_REMOVE_IF_UNREFERENCED const BOOLEAN _gPcd_FixedAtBuild_PcdMyFeatureFlagVar = _PCD_VALUE_PcdMyFeatureFlagVar;
-```
-AutoGen.h
-```
-#define _PCD_TOKEN_PcdMyVarBool 0U
-#define _PCD_SIZE_PcdMyVarBool 1
-#define _PCD_GET_MODE_SIZE_PcdMyVarBool _PCD_SIZE_PcdMyVarBool
-#define _PCD_VALUE_PcdMyVarBool 0U
-extern const BOOLEAN _gPcd_FixedAtBuild_PcdMyVarBool;
-#define _PCD_GET_MODE_BOOL_PcdMyVarBool _gPcd_FixedAtBuild_PcdMyVarBool
-//#define _PCD_SET_MODE_BOOL_PcdMyVarBool ASSERT(FALSE) // It is not allowed to set value for a FIXED_AT_BUILD PCD
-
-#define _PCD_TOKEN_PcdMyFeatureFlagVar 0U
-#define _PCD_SIZE_PcdMyFeatureFlagVar 1
-#define _PCD_GET_MODE_SIZE_PcdMyFeatureFlagVar _PCD_SIZE_PcdMyFeatureFlagVar
-#define _PCD_VALUE_PcdMyFeatureFlagVar ((BOOLEAN)0U)
-extern const BOOLEAN _gPcd_FixedAtBuild_PcdMyFeatureFlagVar;
-#define _PCD_GET_MODE_BOOL_PcdMyFeatureFlagVar _gPcd_FixedAtBuild_PcdMyFeatureFlagVar
-//#define _PCD_SET_MODE_BOOL_PcdMyFeatureFlagVar ASSERT(FALSE) // It is not allowed to set value for a FIXED_AT_BUILD PCD
-```
-
-As you see the differences are subtle. `FeaturePcd` is simply a syntactic sugar for BOOLEAN `FixedAtBuild` PCD.
-