//
// Returns parsed hex integer key.
// Plist - kext pist
// Key - key to find
// WholePlist - _PrelinkInfoDictionary, used to find referenced values
//
// Searches for Key in Plist and it's value:
// a) <integer ID="26" size="64">0x2b000</integer>
// returns 0x2b000
// b) <integer IDREF="26"/>
// searches for <integer ID="26"... from WholePlist
// and returns value from that referenced field
//
// Whole function is here since we should avoid ParseXML() and it's
// memory allocations during ExitBootServices(). And it seems that
// ParseXML() does not support IDREF.
// This func is hard to read and debug and probably not reliable,
// but it seems it works.
//
UINT64
GetPlistHexValue (
CHAR8 *Plist,
CHAR8 *Key,
CHAR8 *WholePlist
)
{
CHAR8 *Value;
CHAR8 *IntTag;
UINT64 NumValue;
CHAR8 *IDStart;
CHAR8 *IDEnd;
UINTN IDLen;
CHAR8 Buffer[48];
NumValue = 0;
// search for Key
Value = AsciiStrStr (Plist, Key);
if (Value == NULL) {
return 0;
}
// search for <integer
IntTag = AsciiStrStr (Value, "<integer");
if (IntTag == NULL) {
return 0;
}
// find <integer end
Value = AsciiStrStr (IntTag, ">");
if (Value == NULL) {
return 0;
}
// normal case: value is here
if (Value[-1] != '/') {
NumValue = AsciiStrHexToUint64 (Value + 1);
return NumValue;
}
// it might be a reference: IDREF="173"/>
Value = AsciiStrStr (IntTag, "<integer IDREF=\"");
if (Value != IntTag) {
return 0;
}
// compose <integer ID="xxx" in the Buffer
IDStart = AsciiStrStr (IntTag, "\"") + 1;
IDEnd = AsciiStrStr (IDStart, "\"");
IDLen = IDEnd - IDStart;
if (IDLen > 8) {
return 0;
}
AsciiStrCpy (Buffer, "<integer ID=\"");
AsciiStrnCat (Buffer, IDStart, IDLen);
AsciiStrCat (Buffer, "\"");
// and search whole plist for ID
IntTag = AsciiStrStr (WholePlist, Buffer);
if (IntTag == NULL) {
return 0;
}
// got it. find closing >
Value = AsciiStrStr (IntTag, ">");
if (Value == NULL) {
return 0;
}
if (Value[-1] == '/') {
return 0;
}
// we should have value now
NumValue = AsciiStrHexToUint64 (Value + 1);
return NumValue;
}
/**
Check every return package for update PRT
@param AcpiSdt Pointer to Acpi SDT protocol
@param ParentHandle ACPI pci device handle
@param PciDeviceInfo Pointer to PCI_DEVICE_INFO
**/
VOID
SdtCheckReturnPackage (
IN EFI_ACPI_SDT_PROTOCOL *AcpiSdt,
IN EFI_ACPI_HANDLE MethodHandle,
IN PCI_DEVICE_INFO *PciDeviceInfo
)
{
EFI_ACPI_HANDLE PreviousHandle;
EFI_ACPI_HANDLE ReturnHandle;
EFI_ACPI_HANDLE PackageHandle;
EFI_ACPI_HANDLE NamePkgHandle;
EFI_STATUS Status;
EFI_ACPI_DATA_TYPE DataType;
UINT8 *Data;
UINTN DataSize;
CHAR8 NameStr[128];
ReturnHandle = NULL;
while (TRUE) {
PreviousHandle = ReturnHandle;
Status = AcpiSdt->GetChild (MethodHandle, &ReturnHandle);
ASSERT_EFI_ERROR (Status);
if (PreviousHandle != NULL) {
Status = AcpiSdt->Close (PreviousHandle);
ASSERT_EFI_ERROR (Status);
}
if (ReturnHandle == NULL) {
break;
}
Status = AcpiSdt->GetOption (ReturnHandle, 0, &DataType, (CONST VOID **)&Data, &DataSize);
ASSERT_EFI_ERROR (Status);
ASSERT (DataType == EFI_ACPI_DATA_TYPE_OPCODE);
if (*Data == AML_RETURN_OP) {
//
// Find the return method handle, then look for the returned package data
//
Status = AcpiSdt->GetOption (ReturnHandle, 1, &DataType, (CONST VOID **)&Data, &DataSize);
ASSERT_EFI_ERROR (Status);
if (DataType == EFI_ACPI_DATA_TYPE_NAME_STRING) {
ZeroMem (NameStr, 128);
AsciiStrCpy (NameStr, "\\_SB.");
DataSize = SdtGetNameStringSize (Data);
AsciiStrnCat (NameStr, (CHAR8 *)Data, DataSize);
NamePkgHandle = NULL;
Status = AcpiSdt->FindPath (mDsdtHandle, NameStr, &NamePkgHandle);
ASSERT_EFI_ERROR (Status);
ASSERT (NamePkgHandle != NULL);
Status = AcpiSdt->GetOption (NamePkgHandle, 0, &DataType, (CONST VOID **)&Data, &DataSize);
ASSERT_EFI_ERROR (Status);
ASSERT (DataType == EFI_ACPI_DATA_TYPE_OPCODE);
ASSERT (*Data == AML_NAME_OP);
Status = AcpiSdt->GetOption (NamePkgHandle, 2, &DataType, (CONST VOID **)&Data, &DataSize);
ASSERT_EFI_ERROR (Status);
ASSERT (DataType == EFI_ACPI_DATA_TYPE_CHILD);
}
ASSERT (DataType == EFI_ACPI_DATA_TYPE_CHILD);
//
// Get the parent package handle
//
PackageHandle = NULL;
Status = AcpiSdt->Open (Data, &PackageHandle);
ASSERT_EFI_ERROR (Status);
//
// Check the parent package for update pci routing
//
SdtCheckParentPackage (AcpiSdt, PackageHandle, PciDeviceInfo);
Status = AcpiSdt->Close (PackageHandle);
ASSERT_EFI_ERROR (Status);
Status = AcpiSdt->Close (ReturnHandle);
ASSERT_EFI_ERROR (Status);
break;
}
//
// Not ReturnOp, search it as parent
//
SdtCheckReturnPackage (AcpiSdt, ReturnHandle, PciDeviceInfo);
}
//
// Done
//
return;
}
