195857638SErik Schmauss // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
295b482a8SLen Brown /******************************************************************************
395b482a8SLen Brown *
41fad8738SBob Moore * Module Name: exstorob - AML object store support, store to object
595b482a8SLen Brown *
6*612c2932SBob Moore * Copyright (C) 2000 - 2023, Intel Corp.
795b482a8SLen Brown *
895857638SErik Schmauss *****************************************************************************/
995b482a8SLen Brown
1095b482a8SLen Brown #include <acpi/acpi.h>
11e2f7a777SLen Brown #include "accommon.h"
12e2f7a777SLen Brown #include "acinterp.h"
1395b482a8SLen Brown
1495b482a8SLen Brown #define _COMPONENT ACPI_EXECUTER
1595b482a8SLen Brown ACPI_MODULE_NAME("exstorob")
1695b482a8SLen Brown
1795b482a8SLen Brown /*******************************************************************************
1895b482a8SLen Brown *
1995b482a8SLen Brown * FUNCTION: acpi_ex_store_buffer_to_buffer
2095b482a8SLen Brown *
2195b482a8SLen Brown * PARAMETERS: source_desc - Source object to copy
2295b482a8SLen Brown * target_desc - Destination object of the copy
2395b482a8SLen Brown *
2495b482a8SLen Brown * RETURN: Status
2595b482a8SLen Brown *
2695b482a8SLen Brown * DESCRIPTION: Copy a buffer object to another buffer object.
2795b482a8SLen Brown *
2895b482a8SLen Brown ******************************************************************************/
2995b482a8SLen Brown acpi_status
acpi_ex_store_buffer_to_buffer(union acpi_operand_object * source_desc,union acpi_operand_object * target_desc)3095b482a8SLen Brown acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc,
3195b482a8SLen Brown union acpi_operand_object *target_desc)
3295b482a8SLen Brown {
3395b482a8SLen Brown u32 length;
3495b482a8SLen Brown u8 *buffer;
3595b482a8SLen Brown
3695b482a8SLen Brown ACPI_FUNCTION_TRACE_PTR(ex_store_buffer_to_buffer, source_desc);
3795b482a8SLen Brown
38b0de22bdSLin Ming /* If Source and Target are the same, just return */
39b0de22bdSLin Ming
40b0de22bdSLin Ming if (source_desc == target_desc) {
41b0de22bdSLin Ming return_ACPI_STATUS(AE_OK);
42b0de22bdSLin Ming }
43b0de22bdSLin Ming
4495b482a8SLen Brown /* We know that source_desc is a buffer by now */
4595b482a8SLen Brown
4695b482a8SLen Brown buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer);
4795b482a8SLen Brown length = source_desc->buffer.length;
4895b482a8SLen Brown
4995b482a8SLen Brown /*
5095b482a8SLen Brown * If target is a buffer of length zero or is a static buffer,
5195b482a8SLen Brown * allocate a new buffer of the proper length
5295b482a8SLen Brown */
5395b482a8SLen Brown if ((target_desc->buffer.length == 0) ||
5495b482a8SLen Brown (target_desc->common.flags & AOPOBJ_STATIC_POINTER)) {
5595b482a8SLen Brown target_desc->buffer.pointer = ACPI_ALLOCATE(length);
5695b482a8SLen Brown if (!target_desc->buffer.pointer) {
5795b482a8SLen Brown return_ACPI_STATUS(AE_NO_MEMORY);
5895b482a8SLen Brown }
5995b482a8SLen Brown
6095b482a8SLen Brown target_desc->buffer.length = length;
6195b482a8SLen Brown }
6295b482a8SLen Brown
6395b482a8SLen Brown /* Copy source buffer to target buffer */
6495b482a8SLen Brown
6595b482a8SLen Brown if (length <= target_desc->buffer.length) {
6695b482a8SLen Brown
6795b482a8SLen Brown /* Clear existing buffer and copy in the new one */
6895b482a8SLen Brown
694fa4616eSBob Moore memset(target_desc->buffer.pointer, 0,
7095b482a8SLen Brown target_desc->buffer.length);
714fa4616eSBob Moore memcpy(target_desc->buffer.pointer, buffer, length);
7295b482a8SLen Brown
7395b482a8SLen Brown #ifdef ACPI_OBSOLETE_BEHAVIOR
7495b482a8SLen Brown /*
7595b482a8SLen Brown * NOTE: ACPI versions up to 3.0 specified that the buffer must be
7695b482a8SLen Brown * truncated if the string is smaller than the buffer. However, "other"
7795b482a8SLen Brown * implementations of ACPI never did this and thus became the defacto
78ba494beeSBob Moore * standard. ACPI 3.0A changes this behavior such that the buffer
7995b482a8SLen Brown * is no longer truncated.
8095b482a8SLen Brown */
8195b482a8SLen Brown
8295b482a8SLen Brown /*
8395b482a8SLen Brown * OBSOLETE BEHAVIOR:
8495b482a8SLen Brown * If the original source was a string, we must truncate the buffer,
8595b482a8SLen Brown * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer
8695b482a8SLen Brown * copy must not truncate the original buffer.
8795b482a8SLen Brown */
8895b482a8SLen Brown if (original_src_type == ACPI_TYPE_STRING) {
8995b482a8SLen Brown
9095b482a8SLen Brown /* Set the new length of the target */
9195b482a8SLen Brown
9295b482a8SLen Brown target_desc->buffer.length = length;
9395b482a8SLen Brown }
9495b482a8SLen Brown #endif
9595b482a8SLen Brown } else {
9695b482a8SLen Brown /* Truncate the source, copy only what will fit */
9795b482a8SLen Brown
984fa4616eSBob Moore memcpy(target_desc->buffer.pointer, buffer,
9995b482a8SLen Brown target_desc->buffer.length);
10095b482a8SLen Brown
10195b482a8SLen Brown ACPI_DEBUG_PRINT((ACPI_DB_INFO,
10295b482a8SLen Brown "Truncating source buffer from %X to %X\n",
10395b482a8SLen Brown length, target_desc->buffer.length));
10495b482a8SLen Brown }
10595b482a8SLen Brown
10695b482a8SLen Brown /* Copy flags */
10795b482a8SLen Brown
10895b482a8SLen Brown target_desc->buffer.flags = source_desc->buffer.flags;
10995b482a8SLen Brown target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
11095b482a8SLen Brown return_ACPI_STATUS(AE_OK);
11195b482a8SLen Brown }
11295b482a8SLen Brown
11395b482a8SLen Brown /*******************************************************************************
11495b482a8SLen Brown *
11595b482a8SLen Brown * FUNCTION: acpi_ex_store_string_to_string
11695b482a8SLen Brown *
11795b482a8SLen Brown * PARAMETERS: source_desc - Source object to copy
11895b482a8SLen Brown * target_desc - Destination object of the copy
11995b482a8SLen Brown *
12095b482a8SLen Brown * RETURN: Status
12195b482a8SLen Brown *
12295b482a8SLen Brown * DESCRIPTION: Copy a String object to another String object
12395b482a8SLen Brown *
12495b482a8SLen Brown ******************************************************************************/
12595b482a8SLen Brown
12695b482a8SLen Brown acpi_status
acpi_ex_store_string_to_string(union acpi_operand_object * source_desc,union acpi_operand_object * target_desc)12795b482a8SLen Brown acpi_ex_store_string_to_string(union acpi_operand_object *source_desc,
12895b482a8SLen Brown union acpi_operand_object *target_desc)
12995b482a8SLen Brown {
13095b482a8SLen Brown u32 length;
13195b482a8SLen Brown u8 *buffer;
13295b482a8SLen Brown
13395b482a8SLen Brown ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, source_desc);
13495b482a8SLen Brown
135b0de22bdSLin Ming /* If Source and Target are the same, just return */
136b0de22bdSLin Ming
137b0de22bdSLin Ming if (source_desc == target_desc) {
138b0de22bdSLin Ming return_ACPI_STATUS(AE_OK);
139b0de22bdSLin Ming }
140b0de22bdSLin Ming
14195b482a8SLen Brown /* We know that source_desc is a string by now */
14295b482a8SLen Brown
14395b482a8SLen Brown buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer);
14495b482a8SLen Brown length = source_desc->string.length;
14595b482a8SLen Brown
14695b482a8SLen Brown /*
14795b482a8SLen Brown * Replace existing string value if it will fit and the string
14895b482a8SLen Brown * pointer is not a static pointer (part of an ACPI table)
14995b482a8SLen Brown */
15095b482a8SLen Brown if ((length < target_desc->string.length) &&
15195b482a8SLen Brown (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
15295b482a8SLen Brown /*
15395b482a8SLen Brown * String will fit in existing non-static buffer.
15495b482a8SLen Brown * Clear old string and copy in the new one
15595b482a8SLen Brown */
1564fa4616eSBob Moore memset(target_desc->string.pointer, 0,
15795b482a8SLen Brown (acpi_size)target_desc->string.length + 1);
1584fa4616eSBob Moore memcpy(target_desc->string.pointer, buffer, length);
15995b482a8SLen Brown } else {
16095b482a8SLen Brown /*
16195b482a8SLen Brown * Free the current buffer, then allocate a new buffer
16295b482a8SLen Brown * large enough to hold the value
16395b482a8SLen Brown */
16495b482a8SLen Brown if (target_desc->string.pointer &&
16595b482a8SLen Brown (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
16695b482a8SLen Brown
16795b482a8SLen Brown /* Only free if not a pointer into the DSDT */
16895b482a8SLen Brown
16995b482a8SLen Brown ACPI_FREE(target_desc->string.pointer);
17095b482a8SLen Brown }
17195b482a8SLen Brown
1721fad8738SBob Moore target_desc->string.pointer =
1731fad8738SBob Moore ACPI_ALLOCATE_ZEROED((acpi_size)length + 1);
1741fad8738SBob Moore
17595b482a8SLen Brown if (!target_desc->string.pointer) {
17695b482a8SLen Brown return_ACPI_STATUS(AE_NO_MEMORY);
17795b482a8SLen Brown }
17895b482a8SLen Brown
17995b482a8SLen Brown target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
1804fa4616eSBob Moore memcpy(target_desc->string.pointer, buffer, length);
18195b482a8SLen Brown }
18295b482a8SLen Brown
18395b482a8SLen Brown /* Set the new target length */
18495b482a8SLen Brown
18595b482a8SLen Brown target_desc->string.length = length;
18695b482a8SLen Brown return_ACPI_STATUS(AE_OK);
18795b482a8SLen Brown }
188