OpenCloudOS-Kernel/drivers/acpi/acpica/exstorob.c

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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name: exstorob - AML object store support, store to object
*
* Copyright (C) 2000 - 2023, Intel Corp.
*
*****************************************************************************/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acinterp.h"
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME("exstorob")
/*******************************************************************************
*
* FUNCTION: acpi_ex_store_buffer_to_buffer
*
* PARAMETERS: source_desc - Source object to copy
* target_desc - Destination object of the copy
*
* RETURN: Status
*
* DESCRIPTION: Copy a buffer object to another buffer object.
*
******************************************************************************/
acpi_status
acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc,
union acpi_operand_object *target_desc)
{
u32 length;
u8 *buffer;
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
ACPI_FUNCTION_TRACE_PTR(ex_store_buffer_to_buffer, source_desc);
/* If Source and Target are the same, just return */
if (source_desc == target_desc) {
return_ACPI_STATUS(AE_OK);
}
/* We know that source_desc is a buffer by now */
[ACPI] ACPICA 20051117 Fixed a problem in the AML parser where the method thread count could be decremented below zero if any errors occurred during the method parse phase. This should eliminate AE_AML_METHOD_LIMIT exceptions seen on some machines. This also fixed a related regression with the mechanism that detects and corrects methods that cannot properly handle reentrancy (related to the deployment of the new OwnerId mechanism.) Eliminated the pre-parsing of control methods (to detect errors) during table load. Related to the problem above, this was causing unwind issues if any errors occurred during the parse, and it seemed to be overkill. A table load should not be aborted if there are problems with any single control method, thus rendering this feature rather pointless. Fixed a problem with the new table-driven resource manager where an internal buffer overflow could occur for small resource templates. Implemented a new external interface, acpi_get_vendor_resource() This interface will find and return a vendor-defined resource descriptor within a _CRS or _PRS method via an ACPI 3.0 UUID match. (from Bjorn Helgaas) Removed the length limit (200) on string objects as per the upcoming ACPI 3.0A specification. This affects the following areas of the interpreter: 1) any implicit conversion of a Buffer to a String, 2) a String object result of the ASL Concatentate operator, 3) the String object result of the ASL ToString operator. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
2005-11-18 02:07:00 +08:00
buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer);
length = source_desc->buffer.length;
/*
* If target is a buffer of length zero or is a static buffer,
* allocate a new buffer of the proper length
*/
if ((target_desc->buffer.length == 0) ||
(target_desc->common.flags & AOPOBJ_STATIC_POINTER)) {
target_desc->buffer.pointer = ACPI_ALLOCATE(length);
if (!target_desc->buffer.pointer) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
target_desc->buffer.length = length;
}
/* Copy source buffer to target buffer */
if (length <= target_desc->buffer.length) {
/* Clear existing buffer and copy in the new one */
memset(target_desc->buffer.pointer, 0,
target_desc->buffer.length);
memcpy(target_desc->buffer.pointer, buffer, length);
#ifdef ACPI_OBSOLETE_BEHAVIOR
/*
* NOTE: ACPI versions up to 3.0 specified that the buffer must be
* truncated if the string is smaller than the buffer. However, "other"
* implementations of ACPI never did this and thus became the defacto
* standard. ACPI 3.0A changes this behavior such that the buffer
* is no longer truncated.
*/
/*
* OBSOLETE BEHAVIOR:
* If the original source was a string, we must truncate the buffer,
* according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer
* copy must not truncate the original buffer.
*/
if (original_src_type == ACPI_TYPE_STRING) {
/* Set the new length of the target */
target_desc->buffer.length = length;
}
#endif
} else {
/* Truncate the source, copy only what will fit */
memcpy(target_desc->buffer.pointer, buffer,
target_desc->buffer.length);
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Truncating source buffer from %X to %X\n",
length, target_desc->buffer.length));
}
/* Copy flags */
target_desc->buffer.flags = source_desc->buffer.flags;
target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_store_string_to_string
*
* PARAMETERS: source_desc - Source object to copy
* target_desc - Destination object of the copy
*
* RETURN: Status
*
* DESCRIPTION: Copy a String object to another String object
*
******************************************************************************/
acpi_status
acpi_ex_store_string_to_string(union acpi_operand_object *source_desc,
union acpi_operand_object *target_desc)
{
u32 length;
u8 *buffer;
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
ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, source_desc);
/* If Source and Target are the same, just return */
if (source_desc == target_desc) {
return_ACPI_STATUS(AE_OK);
}
/* We know that source_desc is a string by now */
[ACPI] ACPICA 20051117 Fixed a problem in the AML parser where the method thread count could be decremented below zero if any errors occurred during the method parse phase. This should eliminate AE_AML_METHOD_LIMIT exceptions seen on some machines. This also fixed a related regression with the mechanism that detects and corrects methods that cannot properly handle reentrancy (related to the deployment of the new OwnerId mechanism.) Eliminated the pre-parsing of control methods (to detect errors) during table load. Related to the problem above, this was causing unwind issues if any errors occurred during the parse, and it seemed to be overkill. A table load should not be aborted if there are problems with any single control method, thus rendering this feature rather pointless. Fixed a problem with the new table-driven resource manager where an internal buffer overflow could occur for small resource templates. Implemented a new external interface, acpi_get_vendor_resource() This interface will find and return a vendor-defined resource descriptor within a _CRS or _PRS method via an ACPI 3.0 UUID match. (from Bjorn Helgaas) Removed the length limit (200) on string objects as per the upcoming ACPI 3.0A specification. This affects the following areas of the interpreter: 1) any implicit conversion of a Buffer to a String, 2) a String object result of the ASL Concatentate operator, 3) the String object result of the ASL ToString operator. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
2005-11-18 02:07:00 +08:00
buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer);
length = source_desc->string.length;
/*
* Replace existing string value if it will fit and the string
* pointer is not a static pointer (part of an ACPI table)
*/
if ((length < target_desc->string.length) &&
(!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
/*
* String will fit in existing non-static buffer.
* Clear old string and copy in the new one
*/
memset(target_desc->string.pointer, 0,
(acpi_size)target_desc->string.length + 1);
memcpy(target_desc->string.pointer, buffer, length);
} else {
/*
* Free the current buffer, then allocate a new buffer
* large enough to hold the value
*/
if (target_desc->string.pointer &&
(!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
/* Only free if not a pointer into the DSDT */
ACPI_FREE(target_desc->string.pointer);
}
target_desc->string.pointer =
ACPI_ALLOCATE_ZEROED((acpi_size)length + 1);
if (!target_desc->string.pointer) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
memcpy(target_desc->string.pointer, buffer, length);
}
/* Set the new target length */
target_desc->string.length = length;
return_ACPI_STATUS(AE_OK);
}