/**
To find Facs in Acpi tables.
To find Firmware ACPI control strutcure in Acpi Tables since the S3 waking vector is stored
in the table.
@param AcpiTableGuid The guid used to find ACPI table in UEFI ConfigurationTable.
@return Facs table pointer.
**/
EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *
FindAcpiFacsTableByAcpiGuid (
IN EFI_GUID *AcpiTableGuid
)
{
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;
EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *Facs;
UINTN Index;
Rsdp = NULL;
//
// found ACPI table RSD_PTR from system table
//
for (Index = 0; Index < gST->NumberOfTableEntries; Index++) {
if (CompareGuid (&(gST->ConfigurationTable[Index].VendorGuid), AcpiTableGuid)) {
//
// A match was found.
//
Rsdp = gST->ConfigurationTable[Index].VendorTable;
break;
}
}
if (Rsdp == NULL) {
return NULL;
}
//
// Search XSDT
//
if (Rsdp->Revision >= EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER_REVISION) {
Xsdt = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN) Rsdp->XsdtAddress;
Fadt = ScanTableInXSDT (Xsdt, EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE);
if (Fadt != NULL) {
Facs = FindAcpiFacsFromFadt (Fadt);
if (Facs != NULL) {
return Facs;
}
}
}
//
// Search RSDT
//
Rsdt = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN) Rsdp->RsdtAddress;
Fadt = ScanTableInRSDT (Rsdt, EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE);
if (Fadt != NULL) {
Facs = FindAcpiFacsFromFadt (Fadt);
if (Facs != NULL) {
return Facs;
}
}
return NULL;
}
VOID *
FindAcpiPtr (
IN HOB_TEMPLATE *Hob,
UINT32 Signature
)
{
EFI_ACPI_DESCRIPTION_HEADER *AcpiTable;
EFI_ACPI_3_0_ROOT_SYSTEM_DESCRIPTION_POINTER *Rsdp;
RSDT_TABLE *Rsdt;
XSDT_TABLE *Xsdt;
AcpiTable = NULL;
//
// Check ACPI2.0 table
//
if ((int)Hob->Acpi20.Table != -1) {
Rsdp = (EFI_ACPI_3_0_ROOT_SYSTEM_DESCRIPTION_POINTER *)(UINTN)Hob->Acpi20.Table;
Rsdt = (RSDT_TABLE *)(UINTN)Rsdp->RsdtAddress;
Xsdt = NULL;
if ((Rsdp->Revision >= 2) && (Rsdp->XsdtAddress < (UINT64)(UINTN)-1)) {
Xsdt = (XSDT_TABLE *)(UINTN)Rsdp->XsdtAddress;
}
//
// Check Xsdt
//
if (Xsdt != NULL) {
ScanTableInXSDT (Xsdt, Signature, &AcpiTable);
}
//
// Check Rsdt
//
if ((AcpiTable == NULL) && (Rsdt != NULL)) {
ScanTableInRSDT (Rsdt, Signature, &AcpiTable);
}
}
//
// Check ACPI1.0 table
//
if ((AcpiTable == NULL) && ((int)Hob->Acpi.Table != -1)) {
Rsdp = (EFI_ACPI_3_0_ROOT_SYSTEM_DESCRIPTION_POINTER *)(UINTN)Hob->Acpi.Table;
Rsdt = (RSDT_TABLE *)(UINTN)Rsdp->RsdtAddress;
//
// Check Rsdt
//
if (Rsdt != NULL) {
ScanTableInRSDT (Rsdt, Signature, &AcpiTable);
}
}
return AcpiTable;
}
