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246 lines
7.8 KiB
C
246 lines
7.8 KiB
C
/*******************************************************************************
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*
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* Module Name: utownerid - Support for Table/Method Owner IDs
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2019, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include "acpi.h"
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#include "accommon.h"
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#include "acnamesp.h"
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#define _COMPONENT ACPI_UTILITIES
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ACPI_MODULE_NAME ("utownerid")
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/*******************************************************************************
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*
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* FUNCTION: AcpiUtAllocateOwnerId
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*
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* PARAMETERS: OwnerId - Where the new owner ID is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Allocate a table or method owner ID. The owner ID is used to
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* track objects created by the table or method, to be deleted
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* when the method exits or the table is unloaded.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiUtAllocateOwnerId (
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ACPI_OWNER_ID *OwnerId)
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{
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UINT32 i;
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UINT32 j;
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UINT32 k;
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ACPI_STATUS Status;
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ACPI_FUNCTION_TRACE (UtAllocateOwnerId);
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/* Guard against multiple allocations of ID to the same location */
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if (*OwnerId)
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{
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ACPI_ERROR ((AE_INFO,
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"Owner ID [0x%2.2X] already exists", *OwnerId));
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return_ACPI_STATUS (AE_ALREADY_EXISTS);
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}
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/* Mutex for the global ID mask */
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Status = AcpiUtAcquireMutex (ACPI_MTX_CACHES);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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/*
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* Find a free owner ID, cycle through all possible IDs on repeated
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* allocations. (ACPI_NUM_OWNERID_MASKS + 1) because first index
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* may have to be scanned twice.
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*/
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for (i = 0, j = AcpiGbl_LastOwnerIdIndex;
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i < (ACPI_NUM_OWNERID_MASKS + 1);
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i++, j++)
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{
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if (j >= ACPI_NUM_OWNERID_MASKS)
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{
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j = 0; /* Wraparound to start of mask array */
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}
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for (k = AcpiGbl_NextOwnerIdOffset; k < 32; k++)
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{
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if (AcpiGbl_OwnerIdMask[j] == ACPI_UINT32_MAX)
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{
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/* There are no free IDs in this mask */
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break;
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}
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/*
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* Note: the UINT32 cast ensures that 1 is stored as a unsigned
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* integer. Omitting the cast may result in 1 being stored as an
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* int. Some compilers or runtime error detection may flag this as
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* an error.
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*/
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if (!(AcpiGbl_OwnerIdMask[j] & ((UINT32) 1 << k)))
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{
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/*
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* Found a free ID. The actual ID is the bit index plus one,
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* making zero an invalid Owner ID. Save this as the last ID
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* allocated and update the global ID mask.
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*/
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AcpiGbl_OwnerIdMask[j] |= ((UINT32) 1 << k);
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AcpiGbl_LastOwnerIdIndex = (UINT8) j;
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AcpiGbl_NextOwnerIdOffset = (UINT8) (k + 1);
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/*
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* Construct encoded ID from the index and bit position
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*
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* Note: Last [j].k (bit 255) is never used and is marked
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* permanently allocated (prevents +1 overflow)
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*/
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*OwnerId = (ACPI_OWNER_ID) ((k + 1) + ACPI_MUL_32 (j));
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ACPI_DEBUG_PRINT ((ACPI_DB_VALUES,
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"Allocated OwnerId: %2.2X\n", (unsigned int) *OwnerId));
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goto Exit;
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}
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}
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AcpiGbl_NextOwnerIdOffset = 0;
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}
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/*
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* All OwnerIds have been allocated. This typically should
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* not happen since the IDs are reused after deallocation. The IDs are
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* allocated upon table load (one per table) and method execution, and
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* they are released when a table is unloaded or a method completes
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* execution.
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*
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* If this error happens, there may be very deep nesting of invoked
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* control methods, or there may be a bug where the IDs are not released.
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*/
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Status = AE_OWNER_ID_LIMIT;
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ACPI_ERROR ((AE_INFO,
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"Could not allocate new OwnerId (255 max), AE_OWNER_ID_LIMIT"));
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Exit:
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(void) AcpiUtReleaseMutex (ACPI_MTX_CACHES);
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return_ACPI_STATUS (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiUtReleaseOwnerId
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*
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* PARAMETERS: OwnerIdPtr - Pointer to a previously allocated OwnerID
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*
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* RETURN: None. No error is returned because we are either exiting a
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* control method or unloading a table. Either way, we would
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* ignore any error anyway.
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*
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* DESCRIPTION: Release a table or method owner ID. Valid IDs are 1 - 255
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*
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******************************************************************************/
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void
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AcpiUtReleaseOwnerId (
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ACPI_OWNER_ID *OwnerIdPtr)
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{
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ACPI_OWNER_ID OwnerId = *OwnerIdPtr;
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ACPI_STATUS Status;
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UINT32 Index;
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UINT32 Bit;
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ACPI_FUNCTION_TRACE_U32 (UtReleaseOwnerId, OwnerId);
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/* Always clear the input OwnerId (zero is an invalid ID) */
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*OwnerIdPtr = 0;
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/* Zero is not a valid OwnerID */
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if (OwnerId == 0)
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{
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ACPI_ERROR ((AE_INFO, "Invalid OwnerId: 0x%2.2X", OwnerId));
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return_VOID;
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}
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/* Mutex for the global ID mask */
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Status = AcpiUtAcquireMutex (ACPI_MTX_CACHES);
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if (ACPI_FAILURE (Status))
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{
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return_VOID;
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}
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/* Normalize the ID to zero */
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OwnerId--;
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/* Decode ID to index/offset pair */
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Index = ACPI_DIV_32 (OwnerId);
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Bit = (UINT32) 1 << ACPI_MOD_32 (OwnerId);
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/* Free the owner ID only if it is valid */
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if (AcpiGbl_OwnerIdMask[Index] & Bit)
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{
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AcpiGbl_OwnerIdMask[Index] ^= Bit;
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}
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else
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{
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ACPI_ERROR ((AE_INFO,
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"Release of non-allocated OwnerId: 0x%2.2X", OwnerId + 1));
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}
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(void) AcpiUtReleaseMutex (ACPI_MTX_CACHES);
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return_VOID;
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}
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