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ArmVirtPkg/XenAcpiPlatformDxe: Install FACS table from DT

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The FACS may still exist when the reduced hardware flag is set in FADT;
it is optional. Since it contains the hardware signature field which
indicates that a hibernated system should boot cleanly instead of
attempting to resume, a platform may choose to expose it. Propagate it
correctly.

Also avoid a NULL pointer dereference if the platform doesn't provide
a DSDT.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Message-Id: <881dd0a2558ecbdfa02c844722d8a1103ab97ab3.camel@infradead.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
[lersek@redhat.com: uncrustify]
This commit is contained in:
David Woodhouse 2024-02-13 10:50:19 +00:00 committed by mergify[bot]
parent f881b4d129
commit ba96acd963
1 changed files with 29 additions and 8 deletions
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37
ArmVirtPkg/XenAcpiPlatformDxe/XenAcpiPlatformDxe.c
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@ -128,10 +128,12 @@ InstallXenArmTables (
EFI_ACPI_DESCRIPTION_HEADER *Xsdt;
EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *FadtTable;
EFI_ACPI_DESCRIPTION_HEADER *DsdtTable;
EFI_ACPI_3_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *FacsTable;
XenAcpiRsdpStructurePtr = NULL;
FadtTable = NULL;
DsdtTable = NULL;
FacsTable = NULL;
TableHandle = 0;
NumberOfTableEntries = 0;
@ -191,6 +193,8 @@ InstallXenArmTables (
FadtTable = (EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *)
(UINTN)CurrentTablePointer;
DsdtTable = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN)FadtTable->Dsdt;
FacsTable = (EFI_ACPI_3_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *)
(UINTN)FadtTable->FirmwareCtrl;
}
}
}
@ -198,14 +202,31 @@ InstallXenArmTables (
//
// Install DSDT table.
//
Status = AcpiProtocol->InstallAcpiTable (
AcpiProtocol,
DsdtTable,
DsdtTable->Length,
&TableHandle
);
if (EFI_ERROR (Status)) {
return Status;
if (DsdtTable != NULL) {
Status = AcpiProtocol->InstallAcpiTable (
AcpiProtocol,
DsdtTable,
DsdtTable->Length,
&TableHandle
);
if (EFI_ERROR (Status)) {
return Status;
}
}
//
// Install FACS table.
//
if (FacsTable != NULL) {
Status = AcpiProtocol->InstallAcpiTable (
AcpiProtocol,
FacsTable,
FacsTable->Length,
&TableHandle
);
if (EFI_ERROR (Status)) {
return Status;
}
}
return EFI_SUCCESS;