491 lines
13 KiB
C
491 lines
13 KiB
C
// 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 - 2020, 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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