android_kernel_xiaomi_sm8350/drivers/acpi/executer/exnames.c
Bob Moore b229cf92ee ACPI: ACPICA 20060421
Removed a device initialization optimization introduced in
20051216 where the _STA method was not run unless an _INI
was also present for the same device. This optimization
could cause problems because it could allow _INI methods
to be run within a not-present device subtree (If a
not-present device had no _INI, _STA would not be run,
the not-present status would not be discovered, and the
children of the device would be incorrectly traversed.)

Implemented a new _STA optimization where namespace
subtrees that do not contain _INI are identified and
ignored during device initialization. Selectively running
_STA can significantly improve boot time on large machines
(with assistance from Len Brown.)

Implemented support for the device initialization case
where the returned _STA flags indicate a device not-present
but functioning. In this case, _INI is not run, but the
device children are examined for presence, as per the
ACPI specification.

Implemented an additional change to the IndexField support
in order to conform to MS behavior. The value written to
the Index Register is not simply a byte offset, it is a
byte offset in units of the access width of the parent
Index Field. (Fiodor Suietov)

Defined and deployed a new OSL interface,
acpi_os_validate_address().  This interface is called during
the creation of all AML operation regions, and allows
the host OS to exert control over what addresses it will
allow the AML code to access. Operation Regions whose
addresses are disallowed will cause a runtime exception
when they are actually accessed (will not affect or abort
table loading.)

Defined and deployed a new OSL interface,
acpi_os_validate_interface().  This interface allows the host OS
to match the various "optional" interface/behavior strings
for the _OSI predefined control method as appropriate
(with assistance from Bjorn Helgaas.)

Restructured and corrected various problems in the
exception handling code paths within DsCallControlMethod
and DsTerminateControlMethod in dsmethod (with assistance
from Takayoshi Kochi.)

Modified the Linux source converter to ignore quoted string
literals while converting identifiers from mixed to lower
case. This will correct problems with the disassembler
and other areas where such strings must not be modified.

The ACPI_FUNCTION_* macros no longer require quotes around
the function name. This allows the Linux source converter
to convert the names, now that the converter ignores
quoted strings.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2006-06-14 02:30:55 -04:00

437 lines
11 KiB
C

/******************************************************************************
*
* Module Name: exnames - interpreter/scanner name load/execute
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2006, 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_ALLOCATE(size_needed);
if (!name_string) {
ACPI_ERROR((AE_INFO,
"Could not allocate size %d", 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_ERROR((AE_INFO, "Invalid leading digit: %c", 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_char(*aml_address, 0)); 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_ERROR((AE_INFO,
"Bad character %02x in name, at %p",
*aml_address, aml_address));
}
*in_aml_address = ACPI_CAST_PTR(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,
"RootPrefix(\\) 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,
"ParentPrefix (^) 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,
"DualNamePrefix 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,
"MultiNamePrefix 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,
"NameSeg 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_ERROR((AE_INFO, "Malformed Name at %p", name_string));
status = AE_AML_BAD_NAME;
}
if (ACPI_FAILURE(status)) {
if (name_string) {
ACPI_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);
}