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/*******************************************************************************
*
* Module Name: utownerid - Support for Table/Method Owner IDs
*
******************************************************************************/
/*
* Copyright (C) 2000 - 2018, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include "acpi.h"
#include "accommon.h"
#include "acnamesp.h"
#define _COMPONENT ACPI_UTILITIES
ACPI_MODULE_NAME ("utownerid")
/*******************************************************************************
*
* FUNCTION: AcpiUtAllocateOwnerId
*
* PARAMETERS: OwnerId - Where the new owner ID is returned
*
* RETURN: Status
*
* DESCRIPTION: Allocate a table or method owner ID. The owner ID is used to
* track objects created by the table or method, to be deleted
* when the method exits or the table is unloaded.
*
******************************************************************************/
ACPI_STATUS
AcpiUtAllocateOwnerId (
ACPI_OWNER_ID *OwnerId)
{
UINT32 i;
UINT32 j;
UINT32 k;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (UtAllocateOwnerId);
/* Guard against multiple allocations of ID to the same location */
if (*OwnerId)
{
ACPI_ERROR ((AE_INFO,
"Owner ID [0x%2.2X] already exists", *OwnerId));
return_ACPI_STATUS (AE_ALREADY_EXISTS);
}
/* Mutex for the global ID mask */
Status = AcpiUtAcquireMutex (ACPI_MTX_CACHES);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/*
* Find a free owner ID, cycle through all possible IDs on repeated
* allocations. (ACPI_NUM_OWNERID_MASKS + 1) because first index
* may have to be scanned twice.
*/
for (i = 0, j = AcpiGbl_LastOwnerIdIndex;
i < (ACPI_NUM_OWNERID_MASKS + 1);
i++, j++)
{
if (j >= ACPI_NUM_OWNERID_MASKS)
{
j = 0; /* Wraparound to start of mask array */
}
for (k = AcpiGbl_NextOwnerIdOffset; k < 32; k++)
{
if (AcpiGbl_OwnerIdMask[j] == ACPI_UINT32_MAX)
{
/* There are no free IDs in this mask */
break;
}
/*
* Note: the UINT32 cast ensures that 1 is stored as a unsigned
* integer. Omitting the cast may result in 1 being stored as an
* int. Some compilers or runtime error detection may flag this as
* an error.
*/
if (!(AcpiGbl_OwnerIdMask[j] & ((UINT32) 1 << k)))
{
/*
* Found a free ID. The actual ID is the bit index plus one,
* making zero an invalid Owner ID. Save this as the last ID
* allocated and update the global ID mask.
*/
AcpiGbl_OwnerIdMask[j] |= ((UINT32) 1 << k);
AcpiGbl_LastOwnerIdIndex = (UINT8) j;
AcpiGbl_NextOwnerIdOffset = (UINT8) (k + 1);
/*
* Construct encoded ID from the index and bit position
*
* Note: Last [j].k (bit 255) is never used and is marked
* permanently allocated (prevents +1 overflow)
*/
*OwnerId = (ACPI_OWNER_ID) ((k + 1) + ACPI_MUL_32 (j));
ACPI_DEBUG_PRINT ((ACPI_DB_VALUES,
"Allocated OwnerId: %2.2X\n", (unsigned int) *OwnerId));
goto Exit;
}
}
AcpiGbl_NextOwnerIdOffset = 0;
}
/*
* All OwnerIds have been allocated. This typically should
* not happen since the IDs are reused after deallocation. The IDs are
* allocated upon table load (one per table) and method execution, and
* they are released when a table is unloaded or a method completes
* execution.
*
* If this error happens, there may be very deep nesting of invoked
* control methods, or there may be a bug where the IDs are not released.
*/
Status = AE_OWNER_ID_LIMIT;
ACPI_ERROR ((AE_INFO,
"Could not allocate new OwnerId (255 max), AE_OWNER_ID_LIMIT"));
Exit:
(void) AcpiUtReleaseMutex (ACPI_MTX_CACHES);
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiUtReleaseOwnerId
*
* PARAMETERS: OwnerIdPtr - Pointer to a previously allocated OwnerID
*
* RETURN: None. No error is returned because we are either exiting a
* control method or unloading a table. Either way, we would
* ignore any error anyway.
*
* DESCRIPTION: Release a table or method owner ID. Valid IDs are 1 - 255
*
******************************************************************************/
void
AcpiUtReleaseOwnerId (
ACPI_OWNER_ID *OwnerIdPtr)
{
ACPI_OWNER_ID OwnerId = *OwnerIdPtr;
ACPI_STATUS Status;
UINT32 Index;
UINT32 Bit;
ACPI_FUNCTION_TRACE_U32 (UtReleaseOwnerId, OwnerId);
/* Always clear the input OwnerId (zero is an invalid ID) */
*OwnerIdPtr = 0;
/* Zero is not a valid OwnerID */
if (OwnerId == 0)
{
ACPI_ERROR ((AE_INFO, "Invalid OwnerId: 0x%2.2X", OwnerId));
return_VOID;
}
/* Mutex for the global ID mask */
Status = AcpiUtAcquireMutex (ACPI_MTX_CACHES);
if (ACPI_FAILURE (Status))
{
return_VOID;
}
/* Normalize the ID to zero */
OwnerId--;
/* Decode ID to index/offset pair */
Index = ACPI_DIV_32 (OwnerId);
Bit = (UINT32) 1 << ACPI_MOD_32 (OwnerId);
/* Free the owner ID only if it is valid */
if (AcpiGbl_OwnerIdMask[Index] & Bit)
{
AcpiGbl_OwnerIdMask[Index] ^= Bit;
}
else
{
ACPI_ERROR ((AE_INFO,
"Release of non-allocated OwnerId: 0x%2.2X", (UINT32) OwnerId + 1));
}
(void) AcpiUtReleaseMutex (ACPI_MTX_CACHES);
return_VOID;
}
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