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490 lines
13 KiB
490 lines
13 KiB
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
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/****************************************************************************** |
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* |
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* Module Name: nsconvert - Object conversions for objects returned by |
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* predefined methods |
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* |
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* Copyright (C) 2000 - 2021, Intel Corp. |
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* |
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*****************************************************************************/ |
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#include <acpi/acpi.h> |
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#include "accommon.h" |
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#include "acnamesp.h" |
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#include "acinterp.h" |
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#include "acpredef.h" |
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#include "amlresrc.h" |
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#define _COMPONENT ACPI_NAMESPACE |
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ACPI_MODULE_NAME("nsconvert") |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ns_convert_to_integer |
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* |
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* PARAMETERS: original_object - Object to be converted |
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* return_object - Where the new converted object is returned |
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* |
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* RETURN: Status. AE_OK if conversion was successful. |
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* |
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* DESCRIPTION: Attempt to convert a String/Buffer object to an Integer. |
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* |
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******************************************************************************/ |
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acpi_status |
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acpi_ns_convert_to_integer(union acpi_operand_object *original_object, |
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union acpi_operand_object **return_object) |
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{ |
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union acpi_operand_object *new_object; |
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acpi_status status; |
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u64 value = 0; |
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u32 i; |
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switch (original_object->common.type) { |
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case ACPI_TYPE_STRING: |
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/* String-to-Integer conversion */ |
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status = |
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acpi_ut_strtoul64(original_object->string.pointer, &value); |
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if (ACPI_FAILURE(status)) { |
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return (status); |
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} |
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break; |
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case ACPI_TYPE_BUFFER: |
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/* Buffer-to-Integer conversion. Max buffer size is 64 bits. */ |
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if (original_object->buffer.length > 8) { |
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return (AE_AML_OPERAND_TYPE); |
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} |
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/* Extract each buffer byte to create the integer */ |
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for (i = 0; i < original_object->buffer.length; i++) { |
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value |= ((u64) |
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original_object->buffer.pointer[i] << (i * |
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8)); |
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} |
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break; |
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default: |
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return (AE_AML_OPERAND_TYPE); |
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} |
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new_object = acpi_ut_create_integer_object(value); |
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if (!new_object) { |
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return (AE_NO_MEMORY); |
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} |
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*return_object = new_object; |
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return (AE_OK); |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ns_convert_to_string |
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* |
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* PARAMETERS: original_object - Object to be converted |
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* return_object - Where the new converted object is returned |
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* |
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* RETURN: Status. AE_OK if conversion was successful. |
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* |
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* DESCRIPTION: Attempt to convert a Integer/Buffer object to a String. |
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* |
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******************************************************************************/ |
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acpi_status |
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acpi_ns_convert_to_string(union acpi_operand_object *original_object, |
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union acpi_operand_object **return_object) |
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{ |
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union acpi_operand_object *new_object; |
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acpi_size length; |
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acpi_status status; |
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switch (original_object->common.type) { |
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case ACPI_TYPE_INTEGER: |
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/* |
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* Integer-to-String conversion. Commonly, convert |
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* an integer of value 0 to a NULL string. The last element of |
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* _BIF and _BIX packages occasionally need this fix. |
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*/ |
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if (original_object->integer.value == 0) { |
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/* Allocate a new NULL string object */ |
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new_object = acpi_ut_create_string_object(0); |
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if (!new_object) { |
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return (AE_NO_MEMORY); |
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} |
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} else { |
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status = acpi_ex_convert_to_string(original_object, |
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&new_object, |
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ACPI_IMPLICIT_CONVERT_HEX); |
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if (ACPI_FAILURE(status)) { |
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return (status); |
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} |
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} |
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break; |
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case ACPI_TYPE_BUFFER: |
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/* |
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* Buffer-to-String conversion. Use a to_string |
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* conversion, no transform performed on the buffer data. The best |
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* example of this is the _BIF method, where the string data from |
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* the battery is often (incorrectly) returned as buffer object(s). |
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*/ |
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length = 0; |
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while ((length < original_object->buffer.length) && |
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(original_object->buffer.pointer[length])) { |
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length++; |
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} |
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/* Allocate a new string object */ |
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new_object = acpi_ut_create_string_object(length); |
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if (!new_object) { |
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return (AE_NO_MEMORY); |
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} |
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/* |
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* Copy the raw buffer data with no transform. String is already NULL |
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* terminated at Length+1. |
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*/ |
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memcpy(new_object->string.pointer, |
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original_object->buffer.pointer, length); |
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break; |
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default: |
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return (AE_AML_OPERAND_TYPE); |
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} |
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*return_object = new_object; |
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return (AE_OK); |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ns_convert_to_buffer |
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* |
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* PARAMETERS: original_object - Object to be converted |
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* return_object - Where the new converted object is returned |
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* |
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* RETURN: Status. AE_OK if conversion was successful. |
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* |
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* DESCRIPTION: Attempt to convert a Integer/String/Package object to a Buffer. |
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* |
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******************************************************************************/ |
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acpi_status |
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acpi_ns_convert_to_buffer(union acpi_operand_object *original_object, |
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union acpi_operand_object **return_object) |
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{ |
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union acpi_operand_object *new_object; |
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acpi_status status; |
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union acpi_operand_object **elements; |
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u32 *dword_buffer; |
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u32 count; |
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u32 i; |
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switch (original_object->common.type) { |
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case ACPI_TYPE_INTEGER: |
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/* |
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* Integer-to-Buffer conversion. |
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* Convert the Integer to a packed-byte buffer. _MAT and other |
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* objects need this sometimes, if a read has been performed on a |
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* Field object that is less than or equal to the global integer |
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* size (32 or 64 bits). |
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*/ |
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status = |
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acpi_ex_convert_to_buffer(original_object, &new_object); |
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if (ACPI_FAILURE(status)) { |
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return (status); |
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} |
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break; |
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case ACPI_TYPE_STRING: |
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/* String-to-Buffer conversion. Simple data copy */ |
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new_object = acpi_ut_create_buffer_object |
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(original_object->string.length); |
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if (!new_object) { |
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return (AE_NO_MEMORY); |
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} |
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memcpy(new_object->buffer.pointer, |
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original_object->string.pointer, |
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original_object->string.length); |
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break; |
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case ACPI_TYPE_PACKAGE: |
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/* |
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* This case is often seen for predefined names that must return a |
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* Buffer object with multiple DWORD integers within. For example, |
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* _FDE and _GTM. The Package can be converted to a Buffer. |
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*/ |
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/* All elements of the Package must be integers */ |
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elements = original_object->package.elements; |
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count = original_object->package.count; |
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for (i = 0; i < count; i++) { |
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if ((!*elements) || |
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((*elements)->common.type != ACPI_TYPE_INTEGER)) { |
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return (AE_AML_OPERAND_TYPE); |
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} |
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elements++; |
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} |
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/* Create the new buffer object to replace the Package */ |
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new_object = acpi_ut_create_buffer_object(ACPI_MUL_4(count)); |
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if (!new_object) { |
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return (AE_NO_MEMORY); |
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} |
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/* Copy the package elements (integers) to the buffer as DWORDs */ |
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elements = original_object->package.elements; |
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dword_buffer = ACPI_CAST_PTR(u32, new_object->buffer.pointer); |
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for (i = 0; i < count; i++) { |
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*dword_buffer = (u32)(*elements)->integer.value; |
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dword_buffer++; |
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elements++; |
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} |
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break; |
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default: |
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return (AE_AML_OPERAND_TYPE); |
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} |
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*return_object = new_object; |
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return (AE_OK); |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ns_convert_to_unicode |
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* |
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* PARAMETERS: scope - Namespace node for the method/object |
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* original_object - ASCII String Object to be converted |
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* return_object - Where the new converted object is returned |
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* |
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* RETURN: Status. AE_OK if conversion was successful. |
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* |
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* DESCRIPTION: Attempt to convert a String object to a Unicode string Buffer. |
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* |
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******************************************************************************/ |
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acpi_status |
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acpi_ns_convert_to_unicode(struct acpi_namespace_node *scope, |
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union acpi_operand_object *original_object, |
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union acpi_operand_object **return_object) |
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{ |
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union acpi_operand_object *new_object; |
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char *ascii_string; |
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u16 *unicode_buffer; |
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u32 unicode_length; |
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u32 i; |
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if (!original_object) { |
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return (AE_OK); |
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} |
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/* If a Buffer was returned, it must be at least two bytes long */ |
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if (original_object->common.type == ACPI_TYPE_BUFFER) { |
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if (original_object->buffer.length < 2) { |
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return (AE_AML_OPERAND_VALUE); |
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} |
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*return_object = NULL; |
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return (AE_OK); |
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} |
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/* |
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* The original object is an ASCII string. Convert this string to |
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* a unicode buffer. |
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*/ |
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ascii_string = original_object->string.pointer; |
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unicode_length = (original_object->string.length * 2) + 2; |
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/* Create a new buffer object for the Unicode data */ |
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new_object = acpi_ut_create_buffer_object(unicode_length); |
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if (!new_object) { |
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return (AE_NO_MEMORY); |
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} |
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unicode_buffer = ACPI_CAST_PTR(u16, new_object->buffer.pointer); |
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/* Convert ASCII to Unicode */ |
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for (i = 0; i < original_object->string.length; i++) { |
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unicode_buffer[i] = (u16)ascii_string[i]; |
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} |
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*return_object = new_object; |
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return (AE_OK); |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ns_convert_to_resource |
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* |
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* PARAMETERS: scope - Namespace node for the method/object |
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* original_object - Object to be converted |
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* return_object - Where the new converted object is returned |
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* |
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* RETURN: Status. AE_OK if conversion was successful |
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* |
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* DESCRIPTION: Attempt to convert a Integer object to a resource_template |
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* Buffer. |
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* |
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******************************************************************************/ |
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acpi_status |
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acpi_ns_convert_to_resource(struct acpi_namespace_node *scope, |
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union acpi_operand_object *original_object, |
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union acpi_operand_object **return_object) |
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{ |
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union acpi_operand_object *new_object; |
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u8 *buffer; |
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/* |
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* We can fix the following cases for an expected resource template: |
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* 1. No return value (interpreter slack mode is disabled) |
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* 2. A "Return (Zero)" statement |
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* 3. A "Return empty buffer" statement |
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* |
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* We will return a buffer containing a single end_tag |
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* resource descriptor. |
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*/ |
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if (original_object) { |
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switch (original_object->common.type) { |
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case ACPI_TYPE_INTEGER: |
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/* We can only repair an Integer==0 */ |
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if (original_object->integer.value) { |
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return (AE_AML_OPERAND_TYPE); |
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} |
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break; |
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case ACPI_TYPE_BUFFER: |
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if (original_object->buffer.length) { |
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/* Additional checks can be added in the future */ |
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*return_object = NULL; |
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return (AE_OK); |
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} |
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break; |
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case ACPI_TYPE_STRING: |
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default: |
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return (AE_AML_OPERAND_TYPE); |
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} |
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} |
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/* Create the new buffer object for the resource descriptor */ |
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new_object = acpi_ut_create_buffer_object(2); |
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if (!new_object) { |
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return (AE_NO_MEMORY); |
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} |
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buffer = ACPI_CAST_PTR(u8, new_object->buffer.pointer); |
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/* Initialize the Buffer with a single end_tag descriptor */ |
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buffer[0] = (ACPI_RESOURCE_NAME_END_TAG | ASL_RDESC_END_TAG_SIZE); |
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buffer[1] = 0x00; |
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*return_object = new_object; |
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return (AE_OK); |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ns_convert_to_reference |
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* |
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* PARAMETERS: scope - Namespace node for the method/object |
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* original_object - Object to be converted |
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* return_object - Where the new converted object is returned |
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* |
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* RETURN: Status. AE_OK if conversion was successful |
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* |
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* DESCRIPTION: Attempt to convert a Integer object to a object_reference. |
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* Buffer. |
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* |
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******************************************************************************/ |
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acpi_status |
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acpi_ns_convert_to_reference(struct acpi_namespace_node *scope, |
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union acpi_operand_object *original_object, |
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union acpi_operand_object **return_object) |
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{ |
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union acpi_operand_object *new_object = NULL; |
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acpi_status status; |
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struct acpi_namespace_node *node; |
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union acpi_generic_state scope_info; |
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char *name; |
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ACPI_FUNCTION_NAME(ns_convert_to_reference); |
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/* Convert path into internal presentation */ |
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status = |
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acpi_ns_internalize_name(original_object->string.pointer, &name); |
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if (ACPI_FAILURE(status)) { |
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return_ACPI_STATUS(status); |
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} |
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/* Find the namespace node */ |
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scope_info.scope.node = |
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ACPI_CAST_PTR(struct acpi_namespace_node, scope); |
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status = |
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acpi_ns_lookup(&scope_info, name, ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE, |
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ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, |
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NULL, &node); |
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if (ACPI_FAILURE(status)) { |
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/* Check if we are resolving a named reference within a package */ |
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ACPI_ERROR_NAMESPACE(&scope_info, |
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original_object->string.pointer, status); |
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goto error_exit; |
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} |
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/* Create and init a new internal ACPI object */ |
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new_object = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE); |
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if (!new_object) { |
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status = AE_NO_MEMORY; |
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goto error_exit; |
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} |
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new_object->reference.node = node; |
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new_object->reference.object = node->object; |
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new_object->reference.class = ACPI_REFCLASS_NAME; |
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/* |
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* Increase reference of the object if needed (the object is likely a |
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* null for device nodes). |
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*/ |
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acpi_ut_add_reference(node->object); |
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error_exit: |
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ACPI_FREE(name); |
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*return_object = new_object; |
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return (status); |
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}
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