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c501d8112c
svn path=/branches/aicom-network-fixes/; revision=34994
388 lines
8.8 KiB
C
388 lines
8.8 KiB
C
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/******************************************************************************
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*
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* Module Name: amnames - interpreter/scanner name load/execute
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* $Revision: 1.1 $
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000, 2001 R. Byron Moore
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <acpi.h>
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#define _COMPONENT ACPI_EXECUTER
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MODULE_NAME ("amnames")
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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_aml_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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NATIVE_CHAR *
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acpi_aml_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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NATIVE_CHAR *temp_ptr;
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NATIVE_CHAR *name_string;
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u32 size_needed;
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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 == (u32) -1) {
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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_cm_allocate (size_needed);
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if (!name_string) {
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REPORT_ERROR (("Aml_allocate_name_string: name allocation failure\n"));
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return (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 == (u32) -1) {
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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_aml_exec_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 (name_string);
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}
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/*******************************************************************************
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*
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* FUNCTION: Acpi_aml_exec_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_aml_exec_name_segment (
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u8 **in_aml_address,
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NATIVE_CHAR *name_string)
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{
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u8 *aml_address = *in_aml_address;
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ACPI_STATUS status = AE_OK;
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u32 index;
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NATIVE_CHAR char_buf[5];
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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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return (AE_CTRL_PENDING);
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}
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for (index = 4;
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(index > 0) && (acpi_cm_valid_acpi_character (*aml_address));
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--index) {
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char_buf[4 - index] = *aml_address++;
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}
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/* Valid name segment */
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if (0 == index) {
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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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STRCAT (name_string, char_buf);
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}
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}
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else if (4 == index) {
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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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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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}
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*in_aml_address = aml_address;
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return (status);
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}
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/*******************************************************************************
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*
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* FUNCTION: Acpi_aml_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_aml_get_name_string (
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OBJECT_TYPE_INTERNAL data_type,
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u8 *in_aml_address,
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NATIVE_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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NATIVE_CHAR *name_string = NULL;
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u32 num_segments;
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u32 prefix_count = 0;
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u8 prefix = 0;
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u8 has_prefix = FALSE;
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if (INTERNAL_TYPE_DEF_FIELD == data_type ||
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INTERNAL_TYPE_BANK_FIELD == data_type ||
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INTERNAL_TYPE_INDEX_FIELD == data_type) {
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/* Disallow prefixes for types associated with field names */
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name_string = acpi_aml_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_aml_exec_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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prefix = *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_aml_allocate_name_string()
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*/
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prefix_count = (u32) -1;
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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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prefix = *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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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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prefix = *aml_address++;
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name_string = acpi_aml_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_aml_exec_name_segment (&aml_address, name_string);
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if (ACPI_SUCCESS (status)) {
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status = acpi_aml_exec_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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prefix = *aml_address++;
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/* Fetch count of segments remaining in name path */
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num_segments = *aml_address++;
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name_string = acpi_aml_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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has_prefix = TRUE;
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while (num_segments &&
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(status = acpi_aml_exec_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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/* Consume the NULL byte */
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aml_address++;
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name_string = acpi_aml_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_aml_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_aml_exec_name_segment (&aml_address, name_string);
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break;
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} /* Switch (Peek_op ()) */
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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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REPORT_ERROR (
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("Aml_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 (status);
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}
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