Establish the full stack of conversions in retrieving the platform
configuration:
MultiConfigAltResp -- form engine / HII communication
^
|
[BlockToConfig]
|
MAIN_FORM_STATE -- binary representation of form/widget state
^
|
[PlatformConfigToFormState]
|
PLATFORM_CONFIG -- accessible to DXE and UEFI drivers
^
|
[PlatformConfigLoad]
|
UEFI non-volatile variable -- accessible to external utilities
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <ler...@redhat.com>
---
Notes:
- check presence of PLATFORM_CONFIG_F_GRAPHICS_RESOLUTION in
PlatformConfigToFormState()
OvmfPkg/PlatformDxe/Platform.c | 90 ++++++++++++++++++++++++++++++++++++++++--
1 file changed, 86 insertions(+), 4 deletions(-)
diff --git a/OvmfPkg/PlatformDxe/Platform.c b/OvmfPkg/PlatformDxe/Platform.c
index 765c6de..8fd1827 100644
--- a/OvmfPkg/PlatformDxe/Platform.c
+++ b/OvmfPkg/PlatformDxe/Platform.c
@@ -15,6 +15,7 @@
**/
#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/DevicePathLib.h>
#include <Library/HiiLib.h>
@@ -126,6 +127,79 @@ STATIC GOP_MODE *mGopModes;
/**
+ Load the persistent platform configuration and translate it to binary form
+ state.
+
+ If the platform configuration is missing, then the function fills in a
+ default state.
+
+ @param[out] MainFormState Binary form/widget state after translation.
+
+ @retval EFI_SUCCESS Form/widget state ready.
+ @return Error codes from underlying functions.
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+PlatformConfigToFormState (
+ OUT MAIN_FORM_STATE *MainFormState
+ )
+{
+ EFI_STATUS Status;
+ PLATFORM_CONFIG PlatformConfig;
+ UINT64 OptionalElements;
+ UINTN ModeNumber;
+
+ ZeroMem (MainFormState, sizeof *MainFormState);
+
+ Status = PlatformConfigLoad (&PlatformConfig, &OptionalElements);
+ switch (Status) {
+ case EFI_SUCCESS:
+ if (OptionalElements & PLATFORM_CONFIG_F_GRAPHICS_RESOLUTION) {
+ //
+ // Format the preferred resolution as text.
+ //
+ UnicodeSPrintAsciiFormat (
+ (CHAR16 *) MainFormState->CurrentPreferredResolution,
+ sizeof MainFormState->CurrentPreferredResolution,
+ "%Ldx%Ld",
+ (INT64) PlatformConfig.HorizontalResolution,
+ (INT64) PlatformConfig.VerticalResolution);
+
+ //
+ // Try to locate it in the drop-down list too. This may not succeed, but
+ // that's fine.
+ //
+ for (ModeNumber = 0; ModeNumber < mNumGopModes; ++ModeNumber) {
+ if (mGopModes[ModeNumber].X == PlatformConfig.HorizontalResolution &&
+ mGopModes[ModeNumber].Y == PlatformConfig.VerticalResolution) {
+ MainFormState->NextPreferredResolution = (UINT32) ModeNumber;
+ break;
+ }
+ }
+
+ break;
+ }
+ //
+ // fall through otherwise
+ //
+
+ case EFI_NOT_FOUND:
+ UnicodeSPrintAsciiFormat (
+ (CHAR16 *) MainFormState->CurrentPreferredResolution,
+ sizeof MainFormState->CurrentPreferredResolution,
+ "Unset");
+ break;
+
+ default:
+ return Status;
+ }
+
+ return EFI_SUCCESS;
+}
+
+
+/**
This function is called by the HII machinery when it fetches the form state.
See the precise documentation in the UEFI spec.
@@ -142,7 +216,9 @@ STATIC GOP_MODE *mGopModes;
all values filled in for the names in the Request
string.
- @return Status codes from gHiiConfigRouting->BlockToConfig().
+ @retval EFI_SUCCESS Extraction of form state in <MultiConfigAltResp>
+ encoding successful.
+ @return Status codes from underlying functions.
**/
STATIC
@@ -160,9 +236,15 @@ ExtractConfig (
DEBUG ((EFI_D_VERBOSE, "%a: Request=\"%s\"\n", __FUNCTION__, Request));
- StrnCpy ((CHAR16 *) MainFormState.CurrentPreferredResolution,
- L"Unset", MAXSIZE_RES_CUR);
- MainFormState.NextPreferredResolution = 0;
+ Status = PlatformConfigToFormState (&MainFormState);
+ if (EFI_ERROR (Status)) {
+ *Progress = Request;
+ return Status;
+ }
+
+ //
+ // Answer the textual request keying off the binary form state.
+ //
Status = gHiiConfigRouting->BlockToConfig (gHiiConfigRouting, Request,
(VOID *) &MainFormState, sizeof MainFormState,
Results, Progress);
--
1.8.3.1
------------------------------------------------------------------------------
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