2018-03-15 07:13:07 +08:00
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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2005-04-17 06:20:36 +08:00
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/******************************************************************************
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*
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2015-12-29 13:54:36 +08:00
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* Module Name: exstorob - AML object store support, store to object
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2005-04-17 06:20:36 +08:00
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*
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2023-04-05 21:38:21 +08:00
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* Copyright (C) 2000 - 2023, Intel Corp.
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2005-04-17 06:20:36 +08:00
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*
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2018-03-15 07:13:07 +08:00
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*****************************************************************************/
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2005-04-17 06:20:36 +08:00
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#include <acpi/acpi.h>
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2009-01-09 13:30:03 +08:00
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#include "accommon.h"
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#include "acinterp.h"
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2005-04-17 06:20:36 +08:00
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#define _COMPONENT ACPI_EXECUTER
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2005-08-05 12:44:28 +08:00
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ACPI_MODULE_NAME("exstorob")
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2005-04-17 06:20:36 +08:00
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_store_buffer_to_buffer
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*
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* PARAMETERS: source_desc - Source object to copy
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* target_desc - Destination object of the copy
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*
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* RETURN: Status
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*
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* DESCRIPTION: Copy a buffer object to another buffer object.
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*
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******************************************************************************/
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acpi_status
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2005-08-05 12:44:28 +08:00
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acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc,
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union acpi_operand_object *target_desc)
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2005-04-17 06:20:36 +08:00
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{
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2005-08-05 12:44:28 +08:00
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u32 length;
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u8 *buffer;
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2005-04-17 06:20:36 +08:00
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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>
2006-04-22 05:15:00 +08:00
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ACPI_FUNCTION_TRACE_PTR(ex_store_buffer_to_buffer, source_desc);
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2005-04-17 06:20:36 +08:00
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2009-08-26 09:01:34 +08:00
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/* If Source and Target are the same, just return */
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if (source_desc == target_desc) {
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return_ACPI_STATUS(AE_OK);
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}
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2005-04-17 06:20:36 +08:00
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/* We know that source_desc is a buffer by now */
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2005-11-18 02:07:00 +08:00
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buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer);
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2005-04-17 06:20:36 +08:00
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length = source_desc->buffer.length;
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/*
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* If target is a buffer of length zero or is a static buffer,
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* allocate a new buffer of the proper length
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*/
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if ((target_desc->buffer.length == 0) ||
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2005-08-05 12:44:28 +08:00
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(target_desc->common.flags & AOPOBJ_STATIC_POINTER)) {
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2006-10-03 12:00:00 +08:00
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target_desc->buffer.pointer = ACPI_ALLOCATE(length);
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2005-04-17 06:20:36 +08:00
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if (!target_desc->buffer.pointer) {
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2005-08-05 12:44:28 +08:00
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return_ACPI_STATUS(AE_NO_MEMORY);
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2005-04-17 06:20:36 +08:00
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}
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target_desc->buffer.length = length;
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}
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/* Copy source buffer to target buffer */
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if (length <= target_desc->buffer.length) {
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2006-10-02 12:00:00 +08:00
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2005-04-17 06:20:36 +08:00
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/* Clear existing buffer and copy in the new one */
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2015-07-01 14:45:11 +08:00
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memset(target_desc->buffer.pointer, 0,
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target_desc->buffer.length);
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memcpy(target_desc->buffer.pointer, buffer, length);
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2005-04-17 06:20:36 +08:00
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#ifdef ACPI_OBSOLETE_BEHAVIOR
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/*
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* NOTE: ACPI versions up to 3.0 specified that the buffer must be
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2012-10-31 10:26:55 +08:00
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* truncated if the string is smaller than the buffer. However, "other"
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2005-04-17 06:20:36 +08:00
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* implementations of ACPI never did this and thus became the defacto
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2012-07-12 09:40:10 +08:00
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* standard. ACPI 3.0A changes this behavior such that the buffer
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2005-04-17 06:20:36 +08:00
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* is no longer truncated.
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*/
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/*
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* OBSOLETE BEHAVIOR:
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* If the original source was a string, we must truncate the buffer,
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2012-10-31 10:26:55 +08:00
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* according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer
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2005-04-17 06:20:36 +08:00
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* copy must not truncate the original buffer.
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*/
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if (original_src_type == ACPI_TYPE_STRING) {
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2006-10-02 12:00:00 +08:00
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2005-04-17 06:20:36 +08:00
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/* Set the new length of the target */
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target_desc->buffer.length = length;
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}
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#endif
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2005-08-05 12:44:28 +08:00
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} else {
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2005-04-17 06:20:36 +08:00
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/* Truncate the source, copy only what will fit */
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2015-07-01 14:45:11 +08:00
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memcpy(target_desc->buffer.pointer, buffer,
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target_desc->buffer.length);
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2005-04-17 06:20:36 +08:00
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2005-08-05 12:44:28 +08:00
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Truncating source buffer from %X to %X\n",
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length, target_desc->buffer.length));
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2005-04-17 06:20:36 +08:00
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}
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/* Copy flags */
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target_desc->buffer.flags = source_desc->buffer.flags;
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target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
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2005-08-05 12:44:28 +08:00
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return_ACPI_STATUS(AE_OK);
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2005-04-17 06:20:36 +08:00
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_store_string_to_string
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*
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* PARAMETERS: source_desc - Source object to copy
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* target_desc - Destination object of the copy
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*
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* RETURN: Status
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*
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* DESCRIPTION: Copy a String object to another String object
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*
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******************************************************************************/
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acpi_status
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2005-08-05 12:44:28 +08:00
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acpi_ex_store_string_to_string(union acpi_operand_object *source_desc,
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union acpi_operand_object *target_desc)
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2005-04-17 06:20:36 +08:00
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{
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2005-08-05 12:44:28 +08:00
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u32 length;
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u8 *buffer;
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2005-04-17 06:20:36 +08:00
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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>
2006-04-22 05:15:00 +08:00
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ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, source_desc);
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2005-04-17 06:20:36 +08:00
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2009-08-26 09:01:34 +08:00
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/* If Source and Target are the same, just return */
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if (source_desc == target_desc) {
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return_ACPI_STATUS(AE_OK);
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}
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2005-04-17 06:20:36 +08:00
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/* We know that source_desc is a string by now */
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2005-11-18 02:07:00 +08:00
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buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer);
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2005-04-17 06:20:36 +08:00
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length = source_desc->string.length;
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/*
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* Replace existing string value if it will fit and the string
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* pointer is not a static pointer (part of an ACPI table)
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*/
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if ((length < target_desc->string.length) &&
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2005-08-05 12:44:28 +08:00
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(!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
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2005-04-17 06:20:36 +08:00
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/*
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* String will fit in existing non-static buffer.
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* Clear old string and copy in the new one
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*/
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2015-07-01 14:45:11 +08:00
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memset(target_desc->string.pointer, 0,
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2016-05-05 12:57:53 +08:00
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(acpi_size)target_desc->string.length + 1);
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2015-07-01 14:45:11 +08:00
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memcpy(target_desc->string.pointer, buffer, length);
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2005-08-05 12:44:28 +08:00
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} else {
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2005-04-17 06:20:36 +08:00
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/*
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* Free the current buffer, then allocate a new buffer
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* large enough to hold the value
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*/
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if (target_desc->string.pointer &&
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2005-08-05 12:44:28 +08:00
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(!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
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2006-10-02 12:00:00 +08:00
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2005-04-17 06:20:36 +08:00
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/* Only free if not a pointer into the DSDT */
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2006-10-03 12:00:00 +08:00
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ACPI_FREE(target_desc->string.pointer);
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2005-04-17 06:20:36 +08:00
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}
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2015-12-29 13:54:36 +08:00
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target_desc->string.pointer =
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2016-05-05 12:57:53 +08:00
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ACPI_ALLOCATE_ZEROED((acpi_size)length + 1);
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2015-12-29 13:54:36 +08:00
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2005-04-17 06:20:36 +08:00
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if (!target_desc->string.pointer) {
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2005-08-05 12:44:28 +08:00
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return_ACPI_STATUS(AE_NO_MEMORY);
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2005-04-17 06:20:36 +08:00
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}
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target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
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2015-07-01 14:45:11 +08:00
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memcpy(target_desc->string.pointer, buffer, length);
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2005-04-17 06:20:36 +08:00
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}
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/* Set the new target length */
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target_desc->string.length = length;
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2005-08-05 12:44:28 +08:00
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return_ACPI_STATUS(AE_OK);
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2005-04-17 06:20:36 +08:00
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}
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