- 根目录:
- drivers
- acpi
- acpica
- nsconvert.c
/******************************************************************************
*
* Module Name: nsconvert - Object conversions for objects returned by
* predefined methods
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2013, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "acinterp.h"
#include "acpredef.h"
#include "amlresrc.h"
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME("nsconvert")
/*******************************************************************************
*
* FUNCTION: acpi_ns_convert_to_integer
*
* PARAMETERS: original_object - Object to be converted
* return_object - Where the new converted object is returned
*
* RETURN: Status. AE_OK if conversion was successful.
*
* DESCRIPTION: Attempt to convert a String/Buffer object to an Integer.
*
******************************************************************************/
acpi_status
acpi_ns_convert_to_integer(union acpi_operand_object *original_object,
union acpi_operand_object **return_object)
{
union acpi_operand_object *new_object;
acpi_status status;
u64 value = 0;
u32 i;
switch (original_object->common.type) {
case ACPI_TYPE_STRING:
/* String-to-Integer conversion */
status = acpi_ut_strtoul64(original_object->string.pointer,
ACPI_ANY_BASE, &value);
if (ACPI_FAILURE(status)) {
return (status);
}
break;
case ACPI_TYPE_BUFFER:
/* Buffer-to-Integer conversion. Max buffer size is 64 bits. */
if (original_object->buffer.length > 8) {
return (AE_AML_OPERAND_TYPE);
}
/* Extract each buffer byte to create the integer */
for (i = 0; i < original_object->buffer.length; i++) {
value |=
((u64)original_object->buffer.
pointer[i] << (i * 8));
}
break;
default:
return (AE_AML_OPERAND_TYPE);
}
new_object = acpi_ut_create_integer_object(value);
if (!new_object) {
return (AE_NO_MEMORY);
}
*return_object = new_object;
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_convert_to_string
*
* PARAMETERS: original_object - Object to be converted
* return_object - Where the new converted object is returned
*
* RETURN: Status. AE_OK if conversion was successful.
*
* DESCRIPTION: Attempt to convert a Integer/Buffer object to a String.
*
******************************************************************************/
acpi_status
acpi_ns_convert_to_string(union acpi_operand_object *original_object,
union acpi_operand_object **return_object)
{
union acpi_operand_object *new_object;
acpi_size length;
acpi_status status;
switch (original_object->common.type) {
case ACPI_TYPE_INTEGER:
/*
* Integer-to-String conversion. Commonly, convert
* an integer of value 0 to a NULL string. The last element of
* _BIF and _BIX packages occasionally need this fix.
*/
if (original_object->integer.value == 0) {
/* Allocate a new NULL string object */
new_object = acpi_ut_create_string_object(0);
if (!new_object) {
return (AE_NO_MEMORY);
}
} else {
status =
acpi_ex_convert_to_string(original_object,
&new_object,
ACPI_IMPLICIT_CONVERT_HEX);
if (ACPI_FAILURE(status)) {
return (status);
}
}
break;
case ACPI_TYPE_BUFFER:
/*
* Buffer-to-String conversion. Use a to_string
* conversion, no transform performed on the buffer data. The best
* example of this is the _BIF method, where the string data from
* the battery is often (incorrectly) returned as buffer object(s).
*/
length = 0;
while ((length < original_object->buffer.length) &&
(original_object->buffer.pointer[length])) {
length++;
}
/* Allocate a new string object */
new_object = acpi_ut_create_string_object(length);
if (!new_object) {
return (AE_NO_MEMORY);
}
/*
* Copy the raw buffer data with no transform. String is already NULL
* terminated at Length+1.
*/
ACPI_MEMCPY(new_object->string.pointer,
original_object->buffer.pointer, length);
break;
default:
return (AE_AML_OPERAND_TYPE);
}
*return_object = new_object;
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_convert_to_buffer
*
* PARAMETERS: original_object - Object to be converted
* return_object - Where the new converted object is returned
*
* RETURN: Status. AE_OK if conversion was successful.
*
* DESCRIPTION: Attempt to convert a Integer/String/Package object to a Buffer.
*
******************************************************************************/
acpi_status
acpi_ns_convert_to_buffer(union acpi_operand_object *original_object,
union acpi_operand_object **return_object)
{
union acpi_operand_object *new_object;
acpi_status status;
union acpi_operand_object **elements;
u32 *dword_buffer;
u32 count;
u32 i;
switch (original_object->common.type) {
case ACPI_TYPE_INTEGER:
/*
* Integer-to-Buffer conversion.
* Convert the Integer to a packed-byte buffer. _MAT and other
* objects need this sometimes, if a read has been performed on a
* Field object that is less than or equal to the global integer
* size (32 or 64 bits).
*/
status =
acpi_ex_convert_to_buffer(original_object, &new_object);
if (ACPI_FAILURE(status)) {
return (status);
}
break;
case ACPI_TYPE_STRING:
/* String-to-Buffer conversion. Simple data copy */
new_object =
acpi_ut_create_buffer_object(original_object->string.
length);
if (!new_object) {
return (AE_NO_MEMORY);
}
ACPI_MEMCPY(new_object->buffer.pointer,
original_object->string.pointer,
original_object->string.length);
break;
case ACPI_TYPE_PACKAGE:
/*
* This case is often seen for predefined names that must return a
* Buffer object with multiple DWORD integers within. For example,
* _FDE and _GTM. The Package can be converted to a Buffer.
*/
/* All elements of the Package must be integers */
elements = original_object->package.elements;
count = original_object->package.count;
for (i = 0; i < count; i++) {
if ((!*elements) ||
((*elements)->common.type != ACPI_TYPE_INTEGER)) {
return (AE_AML_OPERAND_TYPE);
}
elements++;
}
/* Create the new buffer object to replace the Package */
new_object = acpi_ut_create_buffer_object(ACPI_MUL_4(count));
if (!new_object) {
return (AE_NO_MEMORY);
}
/* Copy the package elements (integers) to the buffer as DWORDs */
elements = original_object->package.elements;
dword_buffer = ACPI_CAST_PTR(u32, new_object->buffer.pointer);
for (i = 0; i < count; i++) {
*dword_buffer = (u32)(*elements)->integer.value;
dword_buffer++;
elements++;
}
break;
default:
return (AE_AML_OPERAND_TYPE);
}
*return_object = new_object;
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_convert_to_unicode
*
* PARAMETERS: original_object - ASCII String Object to be converted
* return_object - Where the new converted object is returned
*
* RETURN: Status. AE_OK if conversion was successful.
*
* DESCRIPTION: Attempt to convert a String object to a Unicode string Buffer.
*
******************************************************************************/
acpi_status
acpi_ns_convert_to_unicode(union acpi_operand_object *original_object,
union acpi_operand_object **return_object)
{
union acpi_operand_object *new_object;
char *ascii_string;
u16 *unicode_buffer;
u32 unicode_length;
u32 i;
if (!original_object) {
return (AE_OK);
}
/* If a Buffer was returned, it must be at least two bytes long */
if (original_object->common.type == ACPI_TYPE_BUFFER) {
if (original_object->buffer.length < 2) {
return (AE_AML_OPERAND_VALUE);
}
*return_object = NULL;
return (AE_OK);
}
/*
* The original object is an ASCII string. Convert this string to
* a unicode buffer.
*/
ascii_string = original_object->string.pointer;
unicode_length = (original_object->string.length * 2) + 2;
/* Create a new buffer object for the Unicode data */
new_object = acpi_ut_create_buffer_object(unicode_length);
if (!new_object) {
return (AE_NO_MEMORY);
}
unicode_buffer = ACPI_CAST_PTR(u16, new_object->buffer.pointer);
/* Convert ASCII to Unicode */
for (i = 0; i < original_object->string.length; i++) {
unicode_buffer[i] = (u16)ascii_string[i];
}
*return_object = new_object;
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_convert_to_resource
*
* PARAMETERS: original_object - Object to be converted
* return_object - Where the new converted object is returned
*
* RETURN: Status. AE_OK if conversion was successful
*
* DESCRIPTION: Attempt to convert a Integer object to a resource_template
* Buffer.
*
******************************************************************************/
acpi_status
acpi_ns_convert_to_resource(union acpi_operand_object *original_object,
union acpi_operand_object **return_object)
{
union acpi_operand_object *new_object;
u8 *buffer;
/*
* We can fix the following cases for an expected resource template:
* 1. No return value (interpreter slack mode is disabled)
* 2. A "Return (Zero)" statement
* 3. A "Return empty buffer" statement
*
* We will return a buffer containing a single end_tag
* resource descriptor.
*/
if (original_object) {
switch (original_object->common.type) {
case ACPI_TYPE_INTEGER:
/* We can only repair an Integer==0 */
if (original_object->integer.value) {
return (AE_AML_OPERAND_TYPE);
}
break;
case ACPI_TYPE_BUFFER:
if (original_object->buffer.length) {
/* Additional checks can be added in the future */
*return_object = NULL;
return (AE_OK);
}
break;
case ACPI_TYPE_STRING:
default:
return (AE_AML_OPERAND_TYPE);
}
}
/* Create the new buffer object for the resource descriptor */
new_object = acpi_ut_create_buffer_object(2);
if (!new_object) {
return (AE_NO_MEMORY);
}
buffer = ACPI_CAST_PTR(u8, new_object->buffer.pointer);
/* Initialize the Buffer with a single end_tag descriptor */
buffer[0] = (ACPI_RESOURCE_NAME_END_TAG | ASL_RDESC_END_TAG_SIZE);
buffer[1] = 0x00;
*return_object = new_object;
return (AE_OK);
}