428 строки
11 KiB
C
428 строки
11 KiB
C
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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 - 2005, 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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/* AML Package Length encodings */
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#define ACPI_AML_PACKAGE_TYPE1 0x40
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#define ACPI_AML_PACKAGE_TYPE2 0x4000
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#define ACPI_AML_PACKAGE_TYPE3 0x400000
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#define ACPI_AML_PACKAGE_TYPE4 0x40000000
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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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char *
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acpi_ex_allocate_name_string (
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u32 prefix_count,
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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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}
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else {
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size_needed = 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_MEM_ALLOCATE (size_needed);
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if (!name_string) {
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ACPI_REPORT_ERROR (("ex_allocate_name_string: Could not allocate size %d\n", 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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}
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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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}
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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: interpreter_mode - Current running mode (load1/Load2/Exec)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Execute a name segment (4 bytes)
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*
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******************************************************************************/
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acpi_status
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acpi_ex_name_segment (
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u8 **in_aml_address,
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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_DEBUG_PRINT ((ACPI_DB_ERROR, "leading digit: %c\n", 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;
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(index < ACPI_NAME_SIZE) && (acpi_ut_valid_acpi_character (*aml_address));
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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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}
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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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}
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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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}
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else {
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/* Segment started with one or more valid characters, but fewer than 4 */
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status = AE_AML_BAD_NAME;
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Bad character %02x in name, at %p\n",
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*aml_address, aml_address));
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}
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*in_aml_address = (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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* PARAMETERS: data_type - Data type to be associated with this name
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*
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* RETURN: Status
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*
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* DESCRIPTION: Get a name, including any prefixes.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_get_name_string (
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acpi_object_type data_type,
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u8 *in_aml_address,
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char **out_name_string,
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u32 *out_name_length)
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{
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acpi_status status = AE_OK;
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u8 *aml_address = in_aml_address;
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char *name_string = NULL;
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u32 num_segments;
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u32 prefix_count = 0;
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u8 has_prefix = FALSE;
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ACPI_FUNCTION_TRACE_PTR ("ex_get_name_string", aml_address);
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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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ACPI_TYPE_LOCAL_INDEX_FIELD == data_type) {
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/* Disallow prefixes for types associated with field_unit names */
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name_string = acpi_ex_allocate_name_string (0, 1);
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if (!name_string) {
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status = AE_NO_MEMORY;
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}
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else {
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status = acpi_ex_name_segment (&aml_address, name_string);
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}
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}
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else {
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/*
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* data_type 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 (*aml_address) {
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case AML_ROOT_PREFIX:
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ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "root_prefix(\\) at %p\n", aml_address));
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/*
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* Remember that we have a root_prefix --
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* see comment in acpi_ex_allocate_name_string()
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*/
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aml_address++;
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prefix_count = ACPI_UINT32_MAX;
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has_prefix = 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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ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "parent_prefix (^) at %p\n", aml_address));
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aml_address++;
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prefix_count++;
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} while (*aml_address == AML_PARENT_PREFIX);
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has_prefix = 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 (*aml_address) {
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case AML_DUAL_NAME_PREFIX:
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ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "dual_name_prefix at %p\n", aml_address));
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aml_address++;
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name_string = acpi_ex_allocate_name_string (prefix_count, 2);
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if (!name_string) {
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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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has_prefix = TRUE;
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status = acpi_ex_name_segment (&aml_address, name_string);
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if (ACPI_SUCCESS (status)) {
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status = acpi_ex_name_segment (&aml_address, name_string);
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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, "multi_name_prefix at %p\n", aml_address));
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/* Fetch count of segments remaining in name path */
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aml_address++;
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num_segments = *aml_address;
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name_string = acpi_ex_allocate_name_string (prefix_count, num_segments);
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if (!name_string) {
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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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aml_address++;
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has_prefix = TRUE;
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while (num_segments &&
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(status = acpi_ex_name_segment (&aml_address, name_string)) == AE_OK) {
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num_segments--;
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}
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break;
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case 0:
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/* null_name valid as of 8-12-98 ASL/AML Grammar Update */
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if (prefix_count == ACPI_UINT32_MAX) {
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ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "name_seg is \"\\\" followed by NULL\n"));
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}
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/* Consume the NULL byte */
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aml_address++;
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name_string = acpi_ex_allocate_name_string (prefix_count, 0);
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if (!name_string) {
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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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name_string = acpi_ex_allocate_name_string (prefix_count, 1);
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if (!name_string) {
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status = AE_NO_MEMORY;
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break;
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}
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status = acpi_ex_name_segment (&aml_address, name_string);
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break;
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}
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}
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if (AE_CTRL_PENDING == status && has_prefix) {
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/* Ran out of segments after processing a prefix */
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ACPI_REPORT_ERROR (
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("ex_do_name: Malformed Name at %p\n", name_string));
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status = AE_AML_BAD_NAME;
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}
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*out_name_string = name_string;
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*out_name_length = (u32) (aml_address - in_aml_address);
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return_ACPI_STATUS (status);
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}
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