431 lines
12 KiB
C
431 lines
12 KiB
C
|
|
/******************************************************************************
|
|
*
|
|
* Module Name: exnames - interpreter/scanner name load/execute
|
|
*
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* Copyright (C) 2000 - 2005, R. Byron Moore
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions, and the following disclaimer,
|
|
* without modification.
|
|
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
|
|
* substantially similar to the "NO WARRANTY" disclaimer below
|
|
* ("Disclaimer") and any redistribution must be conditioned upon
|
|
* including a substantially similar Disclaimer requirement for further
|
|
* binary redistribution.
|
|
* 3. Neither the names of the above-listed copyright holders nor the names
|
|
* of any contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL") version 2 as published by the Free
|
|
* Software Foundation.
|
|
*
|
|
* NO WARRANTY
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
|
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGES.
|
|
*/
|
|
|
|
#include <acpi/acpi.h>
|
|
#include <acpi/acinterp.h>
|
|
#include <acpi/amlcode.h>
|
|
|
|
#define _COMPONENT ACPI_EXECUTER
|
|
ACPI_MODULE_NAME("exnames")
|
|
|
|
/* Local prototypes */
|
|
static char *acpi_ex_allocate_name_string(u32 prefix_count, u32 num_name_segs);
|
|
|
|
static acpi_status
|
|
acpi_ex_name_segment(u8 ** in_aml_address, char *name_string);
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_allocate_name_string
|
|
*
|
|
* PARAMETERS: prefix_count - Count of parent levels. Special cases:
|
|
* (-1)==root, 0==none
|
|
* num_name_segs - count of 4-character name segments
|
|
*
|
|
* RETURN: A pointer to the allocated string segment. This segment must
|
|
* be deleted by the caller.
|
|
*
|
|
* DESCRIPTION: Allocate a buffer for a name string. Ensure allocated name
|
|
* string is long enough, and set up prefix if any.
|
|
*
|
|
******************************************************************************/
|
|
|
|
static char *acpi_ex_allocate_name_string(u32 prefix_count, u32 num_name_segs)
|
|
{
|
|
char *temp_ptr;
|
|
char *name_string;
|
|
u32 size_needed;
|
|
|
|
ACPI_FUNCTION_TRACE("ex_allocate_name_string");
|
|
|
|
/*
|
|
* Allow room for all \ and ^ prefixes, all segments and a multi_name_prefix.
|
|
* Also, one byte for the null terminator.
|
|
* This may actually be somewhat longer than needed.
|
|
*/
|
|
if (prefix_count == ACPI_UINT32_MAX) {
|
|
/* Special case for root */
|
|
|
|
size_needed = 1 + (ACPI_NAME_SIZE * num_name_segs) + 2 + 1;
|
|
} else {
|
|
size_needed =
|
|
prefix_count + (ACPI_NAME_SIZE * num_name_segs) + 2 + 1;
|
|
}
|
|
|
|
/*
|
|
* Allocate a buffer for the name.
|
|
* This buffer must be deleted by the caller!
|
|
*/
|
|
name_string = ACPI_MEM_ALLOCATE(size_needed);
|
|
if (!name_string) {
|
|
ACPI_REPORT_ERROR(("ex_allocate_name_string: Could not allocate size %d\n", size_needed));
|
|
return_PTR(NULL);
|
|
}
|
|
|
|
temp_ptr = name_string;
|
|
|
|
/* Set up Root or Parent prefixes if needed */
|
|
|
|
if (prefix_count == ACPI_UINT32_MAX) {
|
|
*temp_ptr++ = AML_ROOT_PREFIX;
|
|
} else {
|
|
while (prefix_count--) {
|
|
*temp_ptr++ = AML_PARENT_PREFIX;
|
|
}
|
|
}
|
|
|
|
/* Set up Dual or Multi prefixes if needed */
|
|
|
|
if (num_name_segs > 2) {
|
|
/* Set up multi prefixes */
|
|
|
|
*temp_ptr++ = AML_MULTI_NAME_PREFIX_OP;
|
|
*temp_ptr++ = (char)num_name_segs;
|
|
} else if (2 == num_name_segs) {
|
|
/* Set up dual prefixes */
|
|
|
|
*temp_ptr++ = AML_DUAL_NAME_PREFIX;
|
|
}
|
|
|
|
/*
|
|
* Terminate string following prefixes. acpi_ex_name_segment() will
|
|
* append the segment(s)
|
|
*/
|
|
*temp_ptr = 0;
|
|
|
|
return_PTR(name_string);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_name_segment
|
|
*
|
|
* PARAMETERS: in_aml_address - Pointer to the name in the AML code
|
|
* name_string - Where to return the name. The name is appended
|
|
* to any existing string to form a namepath
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Extract an ACPI name (4 bytes) from the AML byte stream
|
|
*
|
|
******************************************************************************/
|
|
|
|
static acpi_status acpi_ex_name_segment(u8 ** in_aml_address, char *name_string)
|
|
{
|
|
char *aml_address = (void *)*in_aml_address;
|
|
acpi_status status = AE_OK;
|
|
u32 index;
|
|
char char_buf[5];
|
|
|
|
ACPI_FUNCTION_TRACE("ex_name_segment");
|
|
|
|
/*
|
|
* If first character is a digit, then we know that we aren't looking at a
|
|
* valid name segment
|
|
*/
|
|
char_buf[0] = *aml_address;
|
|
|
|
if ('0' <= char_buf[0] && char_buf[0] <= '9') {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "leading digit: %c\n",
|
|
char_buf[0]));
|
|
return_ACPI_STATUS(AE_CTRL_PENDING);
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "Bytes from stream:\n"));
|
|
|
|
for (index = 0;
|
|
(index < ACPI_NAME_SIZE)
|
|
&& (acpi_ut_valid_acpi_character(*aml_address)); index++) {
|
|
char_buf[index] = *aml_address++;
|
|
ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "%c\n", char_buf[index]));
|
|
}
|
|
|
|
/* Valid name segment */
|
|
|
|
if (index == 4) {
|
|
/* Found 4 valid characters */
|
|
|
|
char_buf[4] = '\0';
|
|
|
|
if (name_string) {
|
|
ACPI_STRCAT(name_string, char_buf);
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
|
"Appended to - %s \n", name_string));
|
|
} else {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
|
|
"No Name string - %s \n", char_buf));
|
|
}
|
|
} else if (index == 0) {
|
|
/*
|
|
* First character was not a valid name character,
|
|
* so we are looking at something other than a name.
|
|
*/
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Leading character is not alpha: %02Xh (not a name)\n",
|
|
char_buf[0]));
|
|
status = AE_CTRL_PENDING;
|
|
} else {
|
|
/*
|
|
* Segment started with one or more valid characters, but fewer than
|
|
* the required 4
|
|
*/
|
|
status = AE_AML_BAD_NAME;
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
|
|
"Bad character %02x in name, at %p\n",
|
|
*aml_address, aml_address));
|
|
}
|
|
|
|
*in_aml_address = (u8 *) aml_address;
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_get_name_string
|
|
*
|
|
* PARAMETERS: data_type - Object type to be associated with this
|
|
* name
|
|
* in_aml_address - Pointer to the namestring in the AML code
|
|
* out_name_string - Where the namestring is returned
|
|
* out_name_length - Length of the returned string
|
|
*
|
|
* RETURN: Status, namestring and length
|
|
*
|
|
* DESCRIPTION: Extract a full namepath from the AML byte stream,
|
|
* including any prefixes.
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status
|
|
acpi_ex_get_name_string(acpi_object_type data_type,
|
|
u8 * in_aml_address,
|
|
char **out_name_string, u32 * out_name_length)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
u8 *aml_address = in_aml_address;
|
|
char *name_string = NULL;
|
|
u32 num_segments;
|
|
u32 prefix_count = 0;
|
|
u8 has_prefix = FALSE;
|
|
|
|
ACPI_FUNCTION_TRACE_PTR("ex_get_name_string", aml_address);
|
|
|
|
if (ACPI_TYPE_LOCAL_REGION_FIELD == data_type ||
|
|
ACPI_TYPE_LOCAL_BANK_FIELD == data_type ||
|
|
ACPI_TYPE_LOCAL_INDEX_FIELD == data_type) {
|
|
/* Disallow prefixes for types associated with field_unit names */
|
|
|
|
name_string = acpi_ex_allocate_name_string(0, 1);
|
|
if (!name_string) {
|
|
status = AE_NO_MEMORY;
|
|
} else {
|
|
status =
|
|
acpi_ex_name_segment(&aml_address, name_string);
|
|
}
|
|
} else {
|
|
/*
|
|
* data_type is not a field name.
|
|
* Examine first character of name for root or parent prefix operators
|
|
*/
|
|
switch (*aml_address) {
|
|
case AML_ROOT_PREFIX:
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
|
|
"root_prefix(\\) at %p\n",
|
|
aml_address));
|
|
|
|
/*
|
|
* Remember that we have a root_prefix --
|
|
* see comment in acpi_ex_allocate_name_string()
|
|
*/
|
|
aml_address++;
|
|
prefix_count = ACPI_UINT32_MAX;
|
|
has_prefix = TRUE;
|
|
break;
|
|
|
|
case AML_PARENT_PREFIX:
|
|
|
|
/* Increment past possibly multiple parent prefixes */
|
|
|
|
do {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
|
|
"parent_prefix (^) at %p\n",
|
|
aml_address));
|
|
|
|
aml_address++;
|
|
prefix_count++;
|
|
|
|
} while (*aml_address == AML_PARENT_PREFIX);
|
|
|
|
has_prefix = TRUE;
|
|
break;
|
|
|
|
default:
|
|
|
|
/* Not a prefix character */
|
|
|
|
break;
|
|
}
|
|
|
|
/* Examine first character of name for name segment prefix operator */
|
|
|
|
switch (*aml_address) {
|
|
case AML_DUAL_NAME_PREFIX:
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
|
|
"dual_name_prefix at %p\n",
|
|
aml_address));
|
|
|
|
aml_address++;
|
|
name_string =
|
|
acpi_ex_allocate_name_string(prefix_count, 2);
|
|
if (!name_string) {
|
|
status = AE_NO_MEMORY;
|
|
break;
|
|
}
|
|
|
|
/* Indicate that we processed a prefix */
|
|
|
|
has_prefix = TRUE;
|
|
|
|
status =
|
|
acpi_ex_name_segment(&aml_address, name_string);
|
|
if (ACPI_SUCCESS(status)) {
|
|
status =
|
|
acpi_ex_name_segment(&aml_address,
|
|
name_string);
|
|
}
|
|
break;
|
|
|
|
case AML_MULTI_NAME_PREFIX_OP:
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
|
|
"multi_name_prefix at %p\n",
|
|
aml_address));
|
|
|
|
/* Fetch count of segments remaining in name path */
|
|
|
|
aml_address++;
|
|
num_segments = *aml_address;
|
|
|
|
name_string =
|
|
acpi_ex_allocate_name_string(prefix_count,
|
|
num_segments);
|
|
if (!name_string) {
|
|
status = AE_NO_MEMORY;
|
|
break;
|
|
}
|
|
|
|
/* Indicate that we processed a prefix */
|
|
|
|
aml_address++;
|
|
has_prefix = TRUE;
|
|
|
|
while (num_segments &&
|
|
(status =
|
|
acpi_ex_name_segment(&aml_address,
|
|
name_string)) == AE_OK) {
|
|
num_segments--;
|
|
}
|
|
|
|
break;
|
|
|
|
case 0:
|
|
|
|
/* null_name valid as of 8-12-98 ASL/AML Grammar Update */
|
|
|
|
if (prefix_count == ACPI_UINT32_MAX) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
|
|
"name_seg is \"\\\" followed by NULL\n"));
|
|
}
|
|
|
|
/* Consume the NULL byte */
|
|
|
|
aml_address++;
|
|
name_string =
|
|
acpi_ex_allocate_name_string(prefix_count, 0);
|
|
if (!name_string) {
|
|
status = AE_NO_MEMORY;
|
|
break;
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
/* Name segment string */
|
|
|
|
name_string =
|
|
acpi_ex_allocate_name_string(prefix_count, 1);
|
|
if (!name_string) {
|
|
status = AE_NO_MEMORY;
|
|
break;
|
|
}
|
|
|
|
status =
|
|
acpi_ex_name_segment(&aml_address, name_string);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (AE_CTRL_PENDING == status && has_prefix) {
|
|
/* Ran out of segments after processing a prefix */
|
|
|
|
ACPI_REPORT_ERROR(("ex_do_name: Malformed Name at %p\n",
|
|
name_string));
|
|
status = AE_AML_BAD_NAME;
|
|
}
|
|
|
|
if (ACPI_FAILURE(status)) {
|
|
if (name_string) {
|
|
ACPI_MEM_FREE(name_string);
|
|
}
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
*out_name_string = name_string;
|
|
*out_name_length = (u32) (aml_address - in_aml_address);
|
|
|
|
return_ACPI_STATUS(status);
|
|
}
|