void
AcpiDbDisplayInterfaces (
char *ActionArg,
char *InterfaceNameArg)
{
ACPI_INTERFACE_INFO *NextInterface;
char *SubString;
ACPI_STATUS Status;
/* If no arguments, just display current interface list */
if (!ActionArg)
{
(void) AcpiOsAcquireMutex (AcpiGbl_OsiMutex,
ACPI_WAIT_FOREVER);
NextInterface = AcpiGbl_SupportedInterfaces;
while (NextInterface)
{
if (!(NextInterface->Flags & ACPI_OSI_INVALID))
{
AcpiOsPrintf ("%s\n", NextInterface->Name);
}
NextInterface = NextInterface->Next;
}
AcpiOsReleaseMutex (AcpiGbl_OsiMutex);
return;
}
/* If ActionArg exists, so must InterfaceNameArg */
if (!InterfaceNameArg)
{
AcpiOsPrintf ("Missing Interface Name argument\n");
return;
}
/* Uppercase the action for match below */
AcpiUtStrupr (ActionArg);
/* Install - install an interface */
SubString = ACPI_STRSTR ("INSTALL", ActionArg);
if (SubString)
{
Status = AcpiInstallInterface (InterfaceNameArg);
if (ACPI_FAILURE (Status))
{
AcpiOsPrintf ("%s, while installing \"%s\"\n",
AcpiFormatException (Status), InterfaceNameArg);
}
return;
}
/* Remove - remove an interface */
SubString = ACPI_STRSTR ("REMOVE", ActionArg);
if (SubString)
{
Status = AcpiRemoveInterface (InterfaceNameArg);
if (ACPI_FAILURE (Status))
{
AcpiOsPrintf ("%s, while removing \"%s\"\n",
AcpiFormatException (Status), InterfaceNameArg);
}
return;
}
/* Invalid ActionArg */
AcpiOsPrintf ("Invalid action argument: %s\n", ActionArg);
return;
}
ACPI_STATUS
AcpiUtOsiImplementation (
ACPI_WALK_STATE *WalkState)
{
ACPI_OPERAND_OBJECT *StringDesc;
ACPI_OPERAND_OBJECT *ReturnDesc;
ACPI_INTERFACE_INFO *InterfaceInfo;
ACPI_INTERFACE_HANDLER InterfaceHandler;
UINT32 ReturnValue;
ACPI_FUNCTION_TRACE (UtOsiImplementation);
/* Validate the string input argument (from the AML caller) */
StringDesc = WalkState->Arguments[0].Object;
if (!StringDesc ||
(StringDesc->Common.Type != ACPI_TYPE_STRING))
{
return_ACPI_STATUS (AE_TYPE);
}
/* Create a return object */
ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);
if (!ReturnDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Default return value is 0, NOT SUPPORTED */
ReturnValue = 0;
(void) AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER);
/* Lookup the interface in the global _OSI list */
InterfaceInfo = AcpiUtGetInterface (StringDesc->String.Pointer);
if (InterfaceInfo &&
!(InterfaceInfo->Flags & ACPI_OSI_INVALID))
{
/*
* The interface is supported.
* Update the OsiData if necessary. We keep track of the latest
* version of Windows that has been requested by the BIOS.
*/
if (InterfaceInfo->Value > AcpiGbl_OsiData)
{
AcpiGbl_OsiData = InterfaceInfo->Value;
}
ReturnValue = ACPI_UINT32_MAX;
}
AcpiOsReleaseMutex (AcpiGbl_OsiMutex);
/*
* Invoke an optional _OSI interface handler. The host OS may wish
* to do some interface-specific handling. For example, warn about
* certain interfaces or override the true/false support value.
*/
InterfaceHandler = AcpiGbl_InterfaceHandler;
if (InterfaceHandler)
{
ReturnValue = InterfaceHandler (
StringDesc->String.Pointer, ReturnValue);
}
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INFO,
"ACPI: BIOS _OSI(\"%s\") is %ssupported\n",
StringDesc->String.Pointer, ReturnValue == 0 ? "not " : ""));
/* Complete the return object */
ReturnDesc->Integer.Value = ReturnValue;
WalkState->ReturnDesc = ReturnDesc;
return_ACPI_STATUS (AE_OK);
}
ACPI_STATUS
AcpiUtAcquireMutex (
ACPI_MUTEX_HANDLE MutexId)
{
ACPI_STATUS Status;
ACPI_THREAD_ID ThisThreadId;
ACPI_FUNCTION_NAME (UtAcquireMutex);
if (MutexId > ACPI_MAX_MUTEX)
{
return (AE_BAD_PARAMETER);
}
ThisThreadId = AcpiOsGetThreadId ();
#ifdef ACPI_MUTEX_DEBUG
{
UINT32 i;
/*
* Mutex debug code, for internal debugging only.
*
* Deadlock prevention. Check if this thread owns any mutexes of value
* greater than or equal to this one. If so, the thread has violated
* the mutex ordering rule. This indicates a coding error somewhere in
* the ACPI subsystem code.
*/
for (i = MutexId; i < ACPI_NUM_MUTEX; i++)
{
if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId)
{
if (i == MutexId)
{
ACPI_ERROR ((AE_INFO,
"Mutex [%s] already acquired by this thread [%u]",
AcpiUtGetMutexName (MutexId),
(UINT32) ThisThreadId));
return (AE_ALREADY_ACQUIRED);
}
ACPI_ERROR ((AE_INFO,
"Invalid acquire order: Thread %u owns [%s], wants [%s]",
(UINT32) ThisThreadId, AcpiUtGetMutexName (i),
AcpiUtGetMutexName (MutexId)));
return (AE_ACQUIRE_DEADLOCK);
}
}
}
#endif
ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX,
"Thread %u attempting to acquire Mutex [%s]\n",
(UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
Status = AcpiOsAcquireMutex (AcpiGbl_MutexInfo[MutexId].Mutex,
ACPI_WAIT_FOREVER);
if (ACPI_SUCCESS (Status))
{
ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %u acquired Mutex [%s]\n",
(UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
AcpiGbl_MutexInfo[MutexId].UseCount++;
AcpiGbl_MutexInfo[MutexId].ThreadId = ThisThreadId;
}
else
{
ACPI_EXCEPTION ((AE_INFO, Status,
"Thread %u could not acquire Mutex [0x%X]",
(UINT32) ThisThreadId, MutexId));
}
return (Status);
}
