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Implement test function to get framebuffer address by accessing graphics adapter's BARs

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This commit is contained in:
Rafal Kupiec
2024-01-12 15:18:36 +01:00
parent 9501d3da36
commit 489734d5c9
3 changed files with 80 additions and 0 deletions
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75
xtldr/modules/fb_o/framebuf.c
View File

@@ -197,6 +197,7 @@ VOID
FbPrintDisplayInformation()
{
PWCHAR DriverName = NULL;
PULONG Address;
/* Make sure frame buffer is initialized */
if(!FrameBufferInfo.Initialized)
@@ -208,6 +209,7 @@ FbPrintDisplayInformation()
/* Get display driver name */
FbGetDisplayDriver(DriverName);
XtLdrTestGetFramebufferAddress(&Address);
/* Print video information */
XtLdrProtocol->Debug.Print(L"XTLDR Framebuffer information:\n"
@@ -221,6 +223,7 @@ FbPrintDisplayInformation()
FrameBufferInfo.HorizontalResolution, FrameBufferInfo.VerticalResolution,
FrameBufferInfo.BitsPerPixel, FrameBufferInfo.PixelFormat,
FrameBufferInfo.PixelsPerScanLine);
XtLdrProtocol->Debug.Print(L" Hardware FB Address: 0x%lx\n", Address);
}
/**
@@ -260,3 +263,75 @@ XtLdrModuleMain(IN EFI_HANDLE ImageHandle,
/* Register XTOS boot protocol */
return XtLdrProtocol->Protocol.Install(&XtFramebufferProtocol, &Guid);
}
XTCDECL
EFI_STATUS
XtLdrTestGetFramebufferAddress(OUT PULONG *Address)
{
EFI_GUID PciIoGuid = EFI_PCI_IO_PROTOCOL_GUID;
PEFI_PCI_IO_PROTOCOL Io;
UINT_PTR HandlesCount;
EFI_HANDLE *Handles;
EFI_STATUS Status;
UINT Index;
Handles = NULL;
PEFI_ACPI_ADDRESS_SPACE_DESCRIPTOR BarInfo;
PVOID Addr;
UINT64 Size = 0;
PCI_TYPE0_DEVICE Pci;
Status = XtLdrProtocol->Protocol.LocateHandles(&Handles, &HandlesCount, &PciIoGuid);
if(Status != STATUS_EFI_SUCCESS)
{
XtLdrProtocol->Debug.Print(L"ERROR: Failed to get handles (Status Code: 0x%lx)\n", Status);
return Status;
}
for(Index = 0; Index < HandlesCount; Index++)
{
Status = XtLdrProtocol->Protocol.OpenHandle(Handles[Index], (PVOID *)&Io, &PciIoGuid);
if(Status != STATUS_EFI_SUCCESS)
{
XtLdrProtocol->Debug.Print(L"ERROR: Failed to open protocol (Status Code: 0x%lx)\n", Status);
continue;
}
Status = Io->Pci.Read(Io, EfiPciIoWidthUint32, 0, sizeof(Pci) / sizeof(UINT32), &Pci);
if(Status != STATUS_EFI_SUCCESS)
{
XtLdrProtocol->Debug.Print(L"ERROR: Failed to read class (Status Code: 0x%lx)\n", Status);
}
XtLdrProtocol->Debug.Print(L"Found device class: %u:%u.%u\n", Pci.Hdr.ClassCode[0], Pci.Hdr.ClassCode[1], Pci.Hdr.ClassCode[2]);
if(Pci.Hdr.ClassCode[2] != 0x03)
{
XtLdrProtocol->Protocol.Close(Handles[Index], &PciIoGuid);
continue;
}
for(UINT Bars = 0; Bars < 6; Bars++)
{
Status = Io->GetBarAttributes(Io, Bars, NULL, (VOID **)&BarInfo);
if(Status != STATUS_EFI_SUCCESS)
{
continue;
}
if(BarInfo->SpaceDescriptor == EFI_ACPI_ADDRESS64_SPACE_DESCRIPTOR &&
BarInfo->ResourceType == EFI_ACPI_ADDRESS_SPACE_TYPE_MEMORY)
{
if(BarInfo->AddressLength > Size)
{
Addr = (PVOID)(ULONG_PTR)(BarInfo->AddressRangeMin << 16);
Size = BarInfo->AddressLength;
}
}
}
}
*Address = (PULONG)Addr;
return STATUS_EFI_SUCCESS;
}

4
xtldr/modules/fb_o/includes/framebuf.h
View File

@@ -76,4 +76,8 @@ EFI_STATUS
BlXtLdrModuleMain(IN EFI_HANDLE ImageHandle,
IN PEFI_SYSTEM_TABLE SystemTable);
XTCDECL
EFI_STATUS
XtLdrTestGetFramebufferAddress(OUT PULONG *Address);
#endif /* __XTLDR_MODULES_FRAMEBUF_H */