479 lines
13 KiB
C
479 lines
13 KiB
C
/******************************************************************************
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*
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* Module Name: exnames - interpreter/scanner name load/execute
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2014, 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 "acinterp.h"
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#include "amlcode.h"
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME ("exnames")
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/* Local prototypes */
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static char *
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AcpiExAllocateNameString (
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UINT32 PrefixCount,
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UINT32 NumNameSegs);
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static ACPI_STATUS
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AcpiExNameSegment (
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UINT8 **InAmlAddress,
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char *NameString);
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/*******************************************************************************
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*
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* FUNCTION: AcpiExAllocateNameString
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*
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* PARAMETERS: PrefixCount - Count of parent levels. Special cases:
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* (-1)==root, 0==none
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* NumNameSegs - count of 4-character name segments
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*
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* RETURN: A pointer to the allocated string segment. This segment must
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* be deleted by the caller.
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*
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* DESCRIPTION: Allocate a buffer for a name string. Ensure allocated name
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* string is long enough, and set up prefix if any.
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*
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******************************************************************************/
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static char *
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AcpiExAllocateNameString (
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UINT32 PrefixCount,
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UINT32 NumNameSegs)
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{
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char *TempPtr;
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char *NameString;
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UINT32 SizeNeeded;
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ACPI_FUNCTION_TRACE (ExAllocateNameString);
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/*
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* Allow room for all \ and ^ prefixes, all segments and a MultiNamePrefix.
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* Also, one byte for the null terminator.
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* This may actually be somewhat longer than needed.
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*/
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if (PrefixCount == ACPI_UINT32_MAX)
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{
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/* Special case for root */
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SizeNeeded = 1 + (ACPI_NAME_SIZE * NumNameSegs) + 2 + 1;
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}
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else
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{
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SizeNeeded = PrefixCount + (ACPI_NAME_SIZE * NumNameSegs) + 2 + 1;
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}
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/*
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* Allocate a buffer for the name.
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* This buffer must be deleted by the caller!
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*/
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NameString = ACPI_ALLOCATE (SizeNeeded);
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if (!NameString)
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{
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ACPI_ERROR ((AE_INFO,
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"Could not allocate size %u", SizeNeeded));
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return_PTR (NULL);
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}
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TempPtr = NameString;
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/* Set up Root or Parent prefixes if needed */
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if (PrefixCount == ACPI_UINT32_MAX)
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{
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*TempPtr++ = AML_ROOT_PREFIX;
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}
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else
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{
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while (PrefixCount--)
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{
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*TempPtr++ = AML_PARENT_PREFIX;
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}
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}
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/* Set up Dual or Multi prefixes if needed */
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if (NumNameSegs > 2)
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{
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/* Set up multi prefixes */
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*TempPtr++ = AML_MULTI_NAME_PREFIX_OP;
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*TempPtr++ = (char) NumNameSegs;
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}
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else if (2 == NumNameSegs)
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{
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/* Set up dual prefixes */
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*TempPtr++ = AML_DUAL_NAME_PREFIX;
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}
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/*
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* Terminate string following prefixes. AcpiExNameSegment() will
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* append the segment(s)
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*/
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*TempPtr = 0;
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return_PTR (NameString);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiExNameSegment
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*
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* PARAMETERS: InAmlAddress - Pointer to the name in the AML code
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* NameString - Where to return the name. The name is appended
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* to any existing string to form a namepath
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*
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* RETURN: Status
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*
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* DESCRIPTION: Extract an ACPI name (4 bytes) from the AML byte stream
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*
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******************************************************************************/
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static ACPI_STATUS
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AcpiExNameSegment (
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UINT8 **InAmlAddress,
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char *NameString)
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{
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char *AmlAddress = (void *) *InAmlAddress;
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ACPI_STATUS Status = AE_OK;
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UINT32 Index;
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char CharBuf[5];
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ACPI_FUNCTION_TRACE (ExNameSegment);
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/*
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* If first character is a digit, then we know that we aren't looking at a
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* valid name segment
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*/
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CharBuf[0] = *AmlAddress;
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if ('0' <= CharBuf[0] && CharBuf[0] <= '9')
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{
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ACPI_ERROR ((AE_INFO, "Invalid leading digit: %c", CharBuf[0]));
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return_ACPI_STATUS (AE_CTRL_PENDING);
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "Bytes from stream:\n"));
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for (Index = 0;
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(Index < ACPI_NAME_SIZE) && (AcpiUtValidAcpiChar (*AmlAddress, 0));
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Index++)
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{
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CharBuf[Index] = *AmlAddress++;
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ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "%c\n", CharBuf[Index]));
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}
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/* Valid name segment */
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if (Index == 4)
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{
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/* Found 4 valid characters */
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CharBuf[4] = '\0';
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if (NameString)
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{
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ACPI_STRCAT (NameString, CharBuf);
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
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"Appended to - %s\n", NameString));
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}
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else
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
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"No Name string - %s\n", CharBuf));
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}
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}
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else if (Index == 0)
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{
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/*
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* First character was not a valid name character,
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* so we are looking at something other than a name.
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*/
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ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
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"Leading character is not alpha: %02Xh (not a name)\n",
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CharBuf[0]));
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Status = AE_CTRL_PENDING;
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}
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else
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{
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/*
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* Segment started with one or more valid characters, but fewer than
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* the required 4
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*/
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Status = AE_AML_BAD_NAME;
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ACPI_ERROR ((AE_INFO,
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"Bad character 0x%02x in name, at %p",
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*AmlAddress, AmlAddress));
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}
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*InAmlAddress = ACPI_CAST_PTR (UINT8, AmlAddress);
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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: AcpiExGetNameString
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*
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* PARAMETERS: DataType - Object type to be associated with this
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* name
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* InAmlAddress - Pointer to the namestring in the AML code
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* OutNameString - Where the namestring is returned
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* OutNameLength - Length of the returned string
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*
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* RETURN: Status, namestring and length
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*
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* DESCRIPTION: Extract a full namepath from the AML byte stream,
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* including any prefixes.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiExGetNameString (
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ACPI_OBJECT_TYPE DataType,
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UINT8 *InAmlAddress,
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char **OutNameString,
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UINT32 *OutNameLength)
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{
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ACPI_STATUS Status = AE_OK;
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UINT8 *AmlAddress = InAmlAddress;
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char *NameString = NULL;
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UINT32 NumSegments;
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UINT32 PrefixCount = 0;
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BOOLEAN HasPrefix = FALSE;
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ACPI_FUNCTION_TRACE_PTR (ExGetNameString, AmlAddress);
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if (ACPI_TYPE_LOCAL_REGION_FIELD == DataType ||
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ACPI_TYPE_LOCAL_BANK_FIELD == DataType ||
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ACPI_TYPE_LOCAL_INDEX_FIELD == DataType)
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{
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/* Disallow prefixes for types associated with FieldUnit names */
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NameString = AcpiExAllocateNameString (0, 1);
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if (!NameString)
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{
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Status = AE_NO_MEMORY;
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}
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else
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{
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Status = AcpiExNameSegment (&AmlAddress, NameString);
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}
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}
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else
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{
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/*
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* DataType is not a field name.
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* Examine first character of name for root or parent prefix operators
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*/
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switch (*AmlAddress)
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{
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case AML_ROOT_PREFIX:
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ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "RootPrefix(\\) at %p\n",
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AmlAddress));
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/*
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* Remember that we have a RootPrefix --
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* see comment in AcpiExAllocateNameString()
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*/
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AmlAddress++;
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PrefixCount = ACPI_UINT32_MAX;
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HasPrefix = TRUE;
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break;
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case AML_PARENT_PREFIX:
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/* Increment past possibly multiple parent prefixes */
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do
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "ParentPrefix (^) at %p\n",
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AmlAddress));
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AmlAddress++;
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PrefixCount++;
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} while (*AmlAddress == AML_PARENT_PREFIX);
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HasPrefix = TRUE;
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break;
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default:
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/* Not a prefix character */
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break;
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}
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/* Examine first character of name for name segment prefix operator */
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switch (*AmlAddress)
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{
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case AML_DUAL_NAME_PREFIX:
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ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "DualNamePrefix at %p\n",
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AmlAddress));
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AmlAddress++;
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NameString = AcpiExAllocateNameString (PrefixCount, 2);
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if (!NameString)
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{
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Status = AE_NO_MEMORY;
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break;
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}
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/* Indicate that we processed a prefix */
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HasPrefix = TRUE;
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Status = AcpiExNameSegment (&AmlAddress, NameString);
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if (ACPI_SUCCESS (Status))
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{
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Status = AcpiExNameSegment (&AmlAddress, NameString);
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}
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break;
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case AML_MULTI_NAME_PREFIX_OP:
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ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "MultiNamePrefix at %p\n",
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AmlAddress));
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/* Fetch count of segments remaining in name path */
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AmlAddress++;
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NumSegments = *AmlAddress;
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NameString = AcpiExAllocateNameString (PrefixCount, NumSegments);
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if (!NameString)
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{
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Status = AE_NO_MEMORY;
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break;
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}
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/* Indicate that we processed a prefix */
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AmlAddress++;
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HasPrefix = TRUE;
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while (NumSegments &&
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(Status = AcpiExNameSegment (&AmlAddress, NameString)) ==
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AE_OK)
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{
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NumSegments--;
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}
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break;
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case 0:
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/* NullName valid as of 8-12-98 ASL/AML Grammar Update */
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if (PrefixCount == ACPI_UINT32_MAX)
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
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"NameSeg is \"\\\" followed by NULL\n"));
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}
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/* Consume the NULL byte */
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AmlAddress++;
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NameString = AcpiExAllocateNameString (PrefixCount, 0);
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if (!NameString)
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{
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Status = AE_NO_MEMORY;
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break;
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}
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break;
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default:
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/* Name segment string */
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NameString = AcpiExAllocateNameString (PrefixCount, 1);
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if (!NameString)
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{
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Status = AE_NO_MEMORY;
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break;
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}
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Status = AcpiExNameSegment (&AmlAddress, NameString);
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break;
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}
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}
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if (AE_CTRL_PENDING == Status && HasPrefix)
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{
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/* Ran out of segments after processing a prefix */
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ACPI_ERROR ((AE_INFO,
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"Malformed Name at %p", NameString));
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Status = AE_AML_BAD_NAME;
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}
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if (ACPI_FAILURE (Status))
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{
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if (NameString)
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{
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ACPI_FREE (NameString);
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}
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return_ACPI_STATUS (Status);
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}
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*OutNameString = NameString;
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*OutNameLength = (UINT32) (AmlAddress - InAmlAddress);
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return_ACPI_STATUS (Status);
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}
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