399 lines
9.5 KiB
C
399 lines
9.5 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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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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* Copyright (C) 2000 - 2022, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/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 *acpi_ex_allocate_name_string(u32 prefix_count, u32 num_name_segs);
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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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*
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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_NAMESEG_SIZE * num_name_segs) + 2 + 1;
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} else {
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size_needed =
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prefix_count + (ACPI_NAMESEG_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 %u", 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;
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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
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* at a 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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for (index = 0;
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(index < ACPI_NAMESEG_SIZE)
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&& (acpi_ut_valid_name_char(*aml_address, 0)); index++) {
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char_buf[index] = *aml_address++;
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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_DEBUG_PRINT((ACPI_DB_NAMES,
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"Appending NameSeg %s\n", char_buf));
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strcat(name_string, char_buf);
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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 0x%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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* 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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* 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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acpi_ex_get_name_string(acpi_object_type data_type,
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u8 * in_aml_address,
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char **out_name_string, 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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} else {
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status =
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acpi_ex_name_segment(&aml_address, name_string);
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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,
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"RootPrefix(\\) at %p\n",
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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,
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"ParentPrefix (^) at %p\n",
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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,
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"DualNamePrefix at %p\n",
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aml_address));
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aml_address++;
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name_string =
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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 =
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acpi_ex_name_segment(&aml_address, name_string);
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if (ACPI_SUCCESS(status)) {
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status =
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acpi_ex_name_segment(&aml_address,
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name_string);
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}
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break;
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case AML_MULTI_NAME_PREFIX:
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ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
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"MultiNamePrefix at %p\n",
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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 =
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acpi_ex_allocate_name_string(prefix_count,
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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 =
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acpi_ex_name_segment(&aml_address,
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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,
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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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aml_address++;
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name_string =
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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 =
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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 =
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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_ERROR((AE_INFO, "Malformed Name at %p", name_string));
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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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if (name_string) {
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ACPI_FREE(name_string);
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}
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return_ACPI_STATUS(status);
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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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