The GraphicsConsoleDxe driver (in MdeModulePkg/Universal/Console)
determines the preferred video resolution from the dynamic PCDs
- gEfiMdeModulePkgTokenSpaceGuid.PcdVideoHorizontalResolution
- gEfiMdeModulePkgTokenSpaceGuid.PcdVideoVerticalResolution
Setting the graphics resolution during boot is useful when the guest OS
(for lack of a dedicated display driver) continues to work with the
original GOP resolution and framebuffer.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <ler...@redhat.com>
---
Notes:
- set the resolution PCDs in PlatformDxe rather than PlatformBdsLib
OvmfPkg/PlatformDxe/Platform.inf | 4 ++++
OvmfPkg/PlatformDxe/Platform.c | 41 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 45 insertions(+)
diff --git a/OvmfPkg/PlatformDxe/Platform.inf b/OvmfPkg/PlatformDxe/Platform.inf
index 47ed25b..315f559 100644
--- a/OvmfPkg/PlatformDxe/Platform.inf
+++ b/OvmfPkg/PlatformDxe/Platform.inf
@@ -42,6 +42,10 @@
UefiRuntimeServicesTableLib
UefiDriverEntryPoint
+[Pcd]
+ gEfiMdeModulePkgTokenSpaceGuid.PcdVideoHorizontalResolution
+ gEfiMdeModulePkgTokenSpaceGuid.PcdVideoVerticalResolution
+
[Guids]
gOvmfPlatformConfigGuid
diff --git a/OvmfPkg/PlatformDxe/Platform.c b/OvmfPkg/PlatformDxe/Platform.c
index 7e23530..a6172a8 100644
--- a/OvmfPkg/PlatformDxe/Platform.c
+++ b/OvmfPkg/PlatformDxe/Platform.c
@@ -17,6 +17,46 @@
#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>
+#include "PlatformConfig.h"
+
+/**
+ Load and execute the platform configuration.
+
+ @retval EFI_SUCCESS Configuration loaded and executed.
+ @return Status codes from PlatformConfigLoad().
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+ExecutePlatformConfig (
+ VOID
+ )
+{
+ EFI_STATUS Status;
+ PLATFORM_CONFIG PlatformConfig;
+ UINT64 OptionalElements;
+
+ Status = PlatformConfigLoad (&PlatformConfig, &OptionalElements);
+ if (EFI_ERROR (Status)) {
+ DEBUG (((Status == EFI_NOT_FOUND) ? EFI_D_VERBOSE : EFI_D_ERROR,
+ "%a: failed to load platform config: %r\n", __FUNCTION__, Status));
+ return Status;
+ }
+
+ if (OptionalElements & PLATFORM_CONFIG_F_GRAPHICS_RESOLUTION) {
+ //
+ // Pass the preferred resolution to GraphicsConsoleDxe via dynamic PCDs.
+ //
+ PcdSet32 (PcdVideoHorizontalResolution,
+ PlatformConfig.HorizontalResolution);
+ PcdSet32 (PcdVideoVerticalResolution,
+ PlatformConfig.VerticalResolution);
+ }
+
+ return EFI_SUCCESS;
+}
+
+
/**
Entry point for this driver.
@@ -33,6 +73,7 @@ PlatformInit (
IN EFI_SYSTEM_TABLE *SystemTable
)
{
+ ExecutePlatformConfig ();
return EFI_SUCCESS;
}
--
1.8.3.1
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