The GraphicsConsoleDxe driver (in MdeModulePkg/Universal/Console)
determines the preferred video resolution from the dynamic PCDs
- gEfiMdeModulePkgTokenSpaceGuid.PcdVideoHorizontalResolution
- gEfiMdeModulePkgTokenSpaceGuid.PcdVideoVerticalResolution
Before BDS connects the console(s), let's retrieve the preferred
resolution from the OVMF platform configuration, and set the above PCDs
accordingly.
Setting the GOP 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:
v2:
- retrieve preferred resolution with PlatformConfigLib rather than direct
variable access [Jordan]
- setting the preferred resolution with user tools (UEFI shell, guest OS
tools) is no longer recommended
OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf | 3 +++
OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c | 32 +++++++++++++++++++++++
2 files changed, 35 insertions(+)
diff --git a/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf
b/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf
index a2b72ba..d4aba98 100644
--- a/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf
+++ b/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf
@@ -52,12 +52,15 @@
NvVarsFileLib
QemuFwCfgLib
LoadLinuxLib
+ PlatformConfigLib
[Pcd]
gEfiIntelFrameworkModulePkgTokenSpaceGuid.PcdPlatformBootTimeOut
gEfiIntelFrameworkModulePkgTokenSpaceGuid.PcdLogoFile
gUefiOvmfPkgTokenSpaceGuid.PcdEmuVariableEvent
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashVariablesEnable
+ gEfiMdeModulePkgTokenSpaceGuid.PcdVideoHorizontalResolution
+ gEfiMdeModulePkgTokenSpaceGuid.PcdVideoVerticalResolution
[Pcd.IA32, Pcd.X64]
gEfiMdePkgTokenSpaceGuid.PcdFSBClock
diff --git a/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c
b/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c
index ab9c93e..38f8625 100644
--- a/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c
+++ b/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c
@@ -14,6 +14,7 @@
#include "BdsPlatform.h"
#include "QemuBootOrder.h"
+#include <Library/PlatformConfigLib.h>
//
@@ -1027,6 +1028,36 @@ Returns:
}
+/**
+ Read the preferred resolution from the platform configuration, and pass it to
+ GraphicsConsoleDxe via dynamic PCDs.
+
+ @retval EFI_SUCCESS PCDs have been set.
+ @return Status codes from PlatformConfigLoad().
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+SetPreferredResolution (
+ 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;
+ }
+ PcdSet32 (PcdVideoHorizontalResolution, PlatformConfig.HorizontalResolution);
+ PcdSet32 (PcdVideoVerticalResolution, PlatformConfig.VerticalResolution);
+ return EFI_SUCCESS;
+}
+
+
VOID
EFIAPI
PlatformBdsPolicyBehavior (
@@ -1108,6 +1139,7 @@ Returns:
//
// Connect platform console
//
+ SetPreferredResolution ();
Status = PlatformBdsConnectConsole (gPlatformConsole);
if (EFI_ERROR (Status)) {
//
--
1.8.3.1
------------------------------------------------------------------------------
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