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marcus.erl |
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/******************************************************************************
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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 - 2007, R. Byron Moore
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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/acpi.h>
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#include <acpi/acinterp.h>
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#include <acpi/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 *acpi_ex_allocate_name_string(u32 prefix_count, u32 num_name_segs);
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static acpi_status
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acpi_ex_name_segment(u8 ** in_aml_address, char *name_string);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_allocate_name_string
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*
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* PARAMETERS: prefix_count - Count of parent levels. Special cases:
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* (-1)==root, 0==none
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* num_name_segs - 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 *acpi_ex_allocate_name_string(u32 prefix_count, u32 num_name_segs)
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{
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char *temp_ptr;
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char *name_string;
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u32 size_needed;
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ACPI_FUNCTION_TRACE(ex_allocate_name_string);
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/*
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* Allow room for all \ and ^ prefixes, all segments and a multi_name_prefix.
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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 (prefix_count == ACPI_UINT32_MAX) {
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/* Special case for root */
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size_needed = 1 + (ACPI_NAME_SIZE * num_name_segs) + 2 + 1;
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} else {
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size_needed =
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prefix_count + (ACPI_NAME_SIZE * num_name_segs) + 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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name_string = ACPI_ALLOCATE(size_needed);
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if (!name_string) {
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ACPI_ERROR((AE_INFO,
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"Could not allocate size %d", size_needed));
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return_PTR(NULL);
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}
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temp_ptr = name_string;
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/* Set up Root or Parent prefixes if needed */
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if (prefix_count == ACPI_UINT32_MAX) {
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*temp_ptr++ = AML_ROOT_PREFIX;
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} else {
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while (prefix_count--) {
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*temp_ptr++ = 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 (num_name_segs > 2) {
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/* Set up multi prefixes */
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*temp_ptr++ = AML_MULTI_NAME_PREFIX_OP;
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*temp_ptr++ = (char)num_name_segs;
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} else if (2 == num_name_segs) {
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/* Set up dual prefixes */
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*temp_ptr++ = AML_DUAL_NAME_PREFIX;
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}
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/*
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* Terminate string following prefixes. acpi_ex_name_segment() will
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* append the segment(s)
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*/
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*temp_ptr = 0;
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return_PTR(name_string);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_name_segment
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*
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* PARAMETERS: in_aml_address - Pointer to the name in the AML code
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* name_string - 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 acpi_ex_name_segment(u8 ** in_aml_address, char *name_string)
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{
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char *aml_address = (void *)*in_aml_address;
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acpi_status status = AE_OK;
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u32 index;
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char char_buf[5];
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ACPI_FUNCTION_TRACE(ex_name_segment);
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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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char_buf[0] = *aml_address;
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if ('0' <= char_buf[0] && char_buf[0] <= '9') {
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ACPI_ERROR((AE_INFO, "Invalid leading digit: %c", char_buf[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; (index < ACPI_NAME_SIZE)
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&& (acpi_ut_valid_acpi_char(*aml_address, 0)); index++) {
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char_buf[index] = *aml_address++;
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ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "%c\n", char_buf[index]));
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}
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/* Valid name segment */
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if (index == 4) {
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/* Found 4 valid characters */
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char_buf[4] = '\0';
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if (name_string) {
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ACPI_STRCAT(name_string, char_buf);
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
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"Appended to - %s\n", name_string));
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} else {
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
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"No Name string - %s\n", char_buf));
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}
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} else if (index == 0) {
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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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char_buf[0]));
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status = AE_CTRL_PENDING;
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} else {
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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 %02x in name, at %p",
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*aml_address, aml_address));
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}
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*in_aml_address = ACPI_CAST_PTR(u8, aml_address);
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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: acpi_ex_get_name_string
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*
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| 230 |
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* PARAMETERS: data_type - Object type to be associated with this
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* name
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* in_aml_address - Pointer to the namestring in the AML code
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* out_name_string - Where the namestring is returned
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* out_name_length - Length of the returned string
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*
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| 236 |
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* RETURN: Status, namestring and length
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*
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| 238 |
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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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| 243 |
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acpi_status
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acpi_ex_get_name_string(acpi_object_type data_type,
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| 245 |
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u8 * in_aml_address,
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char **out_name_string, u32 * out_name_length)
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| 247 |
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{
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| 248 |
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acpi_status status = AE_OK;
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| 249 |
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u8 *aml_address = in_aml_address;
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| 250 |
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char *name_string = NULL;
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| 251 |
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u32 num_segments;
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| 252 |
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u32 prefix_count = 0;
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| 253 |
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u8 has_prefix = FALSE;
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| 254 |
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| 255 |
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ACPI_FUNCTION_TRACE_PTR(ex_get_name_string, aml_address);
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| 256 |
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| 257 |
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if (ACPI_TYPE_LOCAL_REGION_FIELD == data_type ||
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ACPI_TYPE_LOCAL_BANK_FIELD == data_type ||
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| 259 |
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ACPI_TYPE_LOCAL_INDEX_FIELD == data_type) {
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| 260 |
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| 261 |
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/* Disallow prefixes for types associated with field_unit names */
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| 262 |
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| 263 |
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name_string = acpi_ex_allocate_name_string(0, 1);
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| 264 |
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if (!name_string) {
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| 265 |
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status = AE_NO_MEMORY;
|
| 266 |
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} else {
|
| 267 |
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status =
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| 268 |
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acpi_ex_name_segment(&aml_address, name_string);
|
| 269 |
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}
|
| 270 |
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} else {
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| 271 |
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/*
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| 272 |
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* data_type is not a field name.
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| 273 |
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* Examine first character of name for root or parent prefix operators
|
| 274 |
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*/
|
| 275 |
|
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switch (*aml_address) {
|
| 276 |
|
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case AML_ROOT_PREFIX:
|
| 277 |
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|
| 278 |
|
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ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
|
| 279 |
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"RootPrefix(\\) at %p\n",
|
| 280 |
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aml_address));
|
| 281 |
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|
|
| 282 |
|
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/*
|
| 283 |
|
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* Remember that we have a root_prefix --
|
| 284 |
|
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* see comment in acpi_ex_allocate_name_string()
|
| 285 |
|
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*/
|
| 286 |
|
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aml_address++;
|
| 287 |
|
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prefix_count = ACPI_UINT32_MAX;
|
| 288 |
|
|
has_prefix = TRUE;
|
| 289 |
|
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break;
|
| 290 |
|
|
|
| 291 |
|
|
case AML_PARENT_PREFIX:
|
| 292 |
|
|
|
| 293 |
|
|
/* Increment past possibly multiple parent prefixes */
|
| 294 |
|
|
|
| 295 |
|
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do {
|
| 296 |
|
|
ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
|
| 297 |
|
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"ParentPrefix (^) at %p\n",
|
| 298 |
|
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aml_address));
|
| 299 |
|
|
|
| 300 |
|
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aml_address++;
|
| 301 |
|
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prefix_count++;
|
| 302 |
|
|
|
| 303 |
|
|
} while (*aml_address == AML_PARENT_PREFIX);
|
| 304 |
|
|
|
| 305 |
|
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has_prefix = TRUE;
|
| 306 |
|
|
break;
|
| 307 |
|
|
|
| 308 |
|
|
default:
|
| 309 |
|
|
|
| 310 |
|
|
/* Not a prefix character */
|
| 311 |
|
|
|
| 312 |
|
|
break;
|
| 313 |
|
|
}
|
| 314 |
|
|
|
| 315 |
|
|
/* Examine first character of name for name segment prefix operator */
|
| 316 |
|
|
|
| 317 |
|
|
switch (*aml_address) {
|
| 318 |
|
|
case AML_DUAL_NAME_PREFIX:
|
| 319 |
|
|
|
| 320 |
|
|
ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
|
| 321 |
|
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"DualNamePrefix at %p\n",
|
| 322 |
|
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aml_address));
|
| 323 |
|
|
|
| 324 |
|
|
aml_address++;
|
| 325 |
|
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name_string =
|
| 326 |
|
|
acpi_ex_allocate_name_string(prefix_count, 2);
|
| 327 |
|
|
if (!name_string) {
|
| 328 |
|
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status = AE_NO_MEMORY;
|
| 329 |
|
|
break;
|
| 330 |
|
|
}
|
| 331 |
|
|
|
| 332 |
|
|
/* Indicate that we processed a prefix */
|
| 333 |
|
|
|
| 334 |
|
|
has_prefix = TRUE;
|
| 335 |
|
|
|
| 336 |
|
|
status =
|
| 337 |
|
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acpi_ex_name_segment(&aml_address, name_string);
|
| 338 |
|
|
if (ACPI_SUCCESS(status)) {
|
| 339 |
|
|
status =
|
| 340 |
|
|
acpi_ex_name_segment(&aml_address,
|
| 341 |
|
|
name_string);
|
| 342 |
|
|
}
|
| 343 |
|
|
break;
|
| 344 |
|
|
|
| 345 |
|
|
case AML_MULTI_NAME_PREFIX_OP:
|
| 346 |
|
|
|
| 347 |
|
|
ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
|
| 348 |
|
|
"MultiNamePrefix at %p\n",
|
| 349 |
|
|
aml_address));
|
| 350 |
|
|
|
| 351 |
|
|
/* Fetch count of segments remaining in name path */
|
| 352 |
|
|
|
| 353 |
|
|
aml_address++;
|
| 354 |
|
|
num_segments = *aml_address;
|
| 355 |
|
|
|
| 356 |
|
|
name_string =
|
| 357 |
|
|
acpi_ex_allocate_name_string(prefix_count,
|
| 358 |
|
|
num_segments);
|
| 359 |
|
|
if (!name_string) {
|
| 360 |
|
|
status = AE_NO_MEMORY;
|
| 361 |
|
|
break;
|
| 362 |
|
|
}
|
| 363 |
|
|
|
| 364 |
|
|
/* Indicate that we processed a prefix */
|
| 365 |
|
|
|
| 366 |
|
|
aml_address++;
|
| 367 |
|
|
has_prefix = TRUE;
|
| 368 |
|
|
|
| 369 |
|
|
while (num_segments &&
|
| 370 |
|
|
(status =
|
| 371 |
|
|
acpi_ex_name_segment(&aml_address,
|
| 372 |
|
|
name_string)) == AE_OK) {
|
| 373 |
|
|
num_segments--;
|
| 374 |
|
|
}
|
| 375 |
|
|
|
| 376 |
|
|
break;
|
| 377 |
|
|
|
| 378 |
|
|
case 0:
|
| 379 |
|
|
|
| 380 |
|
|
/* null_name valid as of 8-12-98 ASL/AML Grammar Update */
|
| 381 |
|
|
|
| 382 |
|
|
if (prefix_count == ACPI_UINT32_MAX) {
|
| 383 |
|
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
|
| 384 |
|
|
"NameSeg is \"\\\" followed by NULL\n"));
|
| 385 |
|
|
}
|
| 386 |
|
|
|
| 387 |
|
|
/* Consume the NULL byte */
|
| 388 |
|
|
|
| 389 |
|
|
aml_address++;
|
| 390 |
|
|
name_string =
|
| 391 |
|
|
acpi_ex_allocate_name_string(prefix_count, 0);
|
| 392 |
|
|
if (!name_string) {
|
| 393 |
|
|
status = AE_NO_MEMORY;
|
| 394 |
|
|
break;
|
| 395 |
|
|
}
|
| 396 |
|
|
|
| 397 |
|
|
break;
|
| 398 |
|
|
|
| 399 |
|
|
default:
|
| 400 |
|
|
|
| 401 |
|
|
/* Name segment string */
|
| 402 |
|
|
|
| 403 |
|
|
name_string =
|
| 404 |
|
|
acpi_ex_allocate_name_string(prefix_count, 1);
|
| 405 |
|
|
if (!name_string) {
|
| 406 |
|
|
status = AE_NO_MEMORY;
|
| 407 |
|
|
break;
|
| 408 |
|
|
}
|
| 409 |
|
|
|
| 410 |
|
|
status =
|
| 411 |
|
|
acpi_ex_name_segment(&aml_address, name_string);
|
| 412 |
|
|
break;
|
| 413 |
|
|
}
|
| 414 |
|
|
}
|
| 415 |
|
|
|
| 416 |
|
|
if (AE_CTRL_PENDING == status && has_prefix) {
|
| 417 |
|
|
|
| 418 |
|
|
/* Ran out of segments after processing a prefix */
|
| 419 |
|
|
|
| 420 |
|
|
ACPI_ERROR((AE_INFO, "Malformed Name at %p", name_string));
|
| 421 |
|
|
status = AE_AML_BAD_NAME;
|
| 422 |
|
|
}
|
| 423 |
|
|
|
| 424 |
|
|
if (ACPI_FAILURE(status)) {
|
| 425 |
|
|
if (name_string) {
|
| 426 |
|
|
ACPI_FREE(name_string);
|
| 427 |
|
|
}
|
| 428 |
|
|
return_ACPI_STATUS(status);
|
| 429 |
|
|
}
|
| 430 |
|
|
|
| 431 |
|
|
*out_name_string = name_string;
|
| 432 |
|
|
*out_name_length = (u32) (aml_address - in_aml_address);
|
| 433 |
|
|
|
| 434 |
|
|
return_ACPI_STATUS(status);
|
| 435 |
|
|
}
|
