diff options
| -rw-r--r-- | PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c | 31 |
1 files changed, 17 insertions, 14 deletions
diff --git a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c index 40d2e49173..2bb41e7e81 100644 --- a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c +++ b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c @@ -1250,8 +1250,6 @@ GetCenturyRtcAddress ( {
EFI_STATUS Status;
EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER *Rsdp;
- EFI_ACPI_DESCRIPTION_HEADER *Rsdt;
- EFI_ACPI_DESCRIPTION_HEADER *Xsdt;
EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *Fadt;
Status = EfiGetSystemConfigurationTable (&gEfiAcpiTableGuid, (VOID **) &Rsdp);
@@ -1259,27 +1257,32 @@ GetCenturyRtcAddress ( Status = EfiGetSystemConfigurationTable (&gEfiAcpi10TableGuid, (VOID **) &Rsdp);
}
- if (EFI_ERROR (Status)) {
+ if (EFI_ERROR (Status) || (Rsdp == NULL)) {
return 0;
}
- ASSERT (Rsdp != NULL);
+ Fadt = NULL;
//
// Find FADT in XSDT
//
- Fadt = NULL;
- if (Rsdp->Revision >= EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER_REVISION) {
- Xsdt = (EFI_ACPI_DESCRIPTION_HEADER *) (UINTN) Rsdp->XsdtAddress;
- Fadt = ScanTableInSDT (Xsdt, EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE, sizeof (UINTN));
+ if (Rsdp->Revision >= EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER_REVISION && Rsdp->XsdtAddress != 0) {
+ Fadt = ScanTableInSDT (
+ (EFI_ACPI_DESCRIPTION_HEADER *) (UINTN) Rsdp->XsdtAddress,
+ EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE,
+ sizeof (UINTN)
+ );
}
- if (Fadt == NULL) {
- //
- // Find FADT in RSDT
- //
- Rsdt = (EFI_ACPI_DESCRIPTION_HEADER *) (UINTN) Rsdp->RsdtAddress;
- Fadt = ScanTableInSDT (Rsdt, EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE, sizeof (UINT32));
+ //
+ // Find FADT in RSDT
+ //
+ if (Fadt == NULL && Rsdp->RsdtAddress != 0) {
+ Fadt = ScanTableInSDT (
+ (EFI_ACPI_DESCRIPTION_HEADER *) (UINTN) Rsdp->RsdtAddress,
+ EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE,
+ sizeof (UINT32)
+ );
}
if ((Fadt != NULL) &&
|