ACPI_TABLE_HEADER *
AcpiTbTableOverride (
ACPI_TABLE_HEADER *TableHeader,
ACPI_TABLE_DESC *TableDesc)
{
ACPI_STATUS Status;
ACPI_TABLE_HEADER *NewTable = NULL;
ACPI_PHYSICAL_ADDRESS NewAddress = 0;
UINT32 NewTableLength = 0;
UINT8 NewFlags;
char *OverrideType;
/* (1) Attempt logical override (returns a logical address) */
Status = AcpiOsTableOverride (TableHeader, &NewTable);
if (ACPI_SUCCESS (Status) && NewTable)
{
NewAddress = ACPI_PTR_TO_PHYSADDR (NewTable);
NewTableLength = NewTable->Length;
NewFlags = ACPI_TABLE_ORIGIN_OVERRIDE;
OverrideType = "Logical";
goto FinishOverride;
}
/* (2) Attempt physical override (returns a physical address) */
Status = AcpiOsPhysicalTableOverride (TableHeader,
&NewAddress, &NewTableLength);
if (ACPI_SUCCESS (Status) && NewAddress && NewTableLength)
{
/* Map the entire new table */
NewTable = AcpiOsMapMemory (NewAddress, NewTableLength);
if (!NewTable)
{
ACPI_EXCEPTION ((AE_INFO, AE_NO_MEMORY,
"%4.4s %p Attempted physical table override failed",
TableHeader->Signature,
ACPI_CAST_PTR (void, TableDesc->Address)));
return (NULL);
}
void
AcpiTbOverrideTable (
ACPI_TABLE_DESC *OldTableDesc)
{
ACPI_STATUS Status;
char *OverrideType;
ACPI_TABLE_DESC NewTableDesc;
ACPI_TABLE_HEADER *Table;
ACPI_PHYSICAL_ADDRESS Address;
UINT32 Length;
/* (1) Attempt logical override (returns a logical address) */
Status = AcpiOsTableOverride (OldTableDesc->Pointer, &Table);
if (ACPI_SUCCESS (Status) && Table)
{
AcpiTbAcquireTempTable (&NewTableDesc, ACPI_PTR_TO_PHYSADDR (Table),
ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL);
OverrideType = "Logical";
goto FinishOverride;
}
/* (2) Attempt physical override (returns a physical address) */
Status = AcpiOsPhysicalTableOverride (OldTableDesc->Pointer,
&Address, &Length);
if (ACPI_SUCCESS (Status) && Address && Length)
{
AcpiTbAcquireTempTable (&NewTableDesc, Address,
ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL);
OverrideType = "Physical";
goto FinishOverride;
}
return; /* There was no override */
FinishOverride:
/* Validate and verify a table before overriding */
Status = AcpiTbVerifyTempTable (&NewTableDesc, NULL);
if (ACPI_FAILURE (Status))
{
return;
}
ACPI_INFO ((AE_INFO, "%4.4s 0x%8.8X%8.8X"
" %s table override, new table: 0x%8.8X%8.8X",
OldTableDesc->Signature.Ascii,
ACPI_FORMAT_UINT64 (OldTableDesc->Address),
OverrideType, ACPI_FORMAT_UINT64 (NewTableDesc.Address)));
/* We can now uninstall the original table */
AcpiTbUninstallTable (OldTableDesc);
/*
* Replace the original table descriptor and keep its state as
* "VALIDATED".
*/
AcpiTbInitTableDescriptor (OldTableDesc, NewTableDesc.Address,
NewTableDesc.Flags, NewTableDesc.Pointer);
AcpiTbValidateTempTable (OldTableDesc);
/* Release the temporary table descriptor */
AcpiTbReleaseTempTable (&NewTableDesc);
}
