717 lines
18 KiB
C
717 lines
18 KiB
C
/******************************************************************************
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*
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* Module Name: exconvrt - Object conversion routines
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2005, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include <acpi/acinterp.h>
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#include <acpi/amlcode.h>
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME ("exconvrt")
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/* Local prototypes */
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static u32
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acpi_ex_convert_to_ascii (
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acpi_integer integer,
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u16 base,
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u8 *string,
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u8 max_length);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_convert_to_integer
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*
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* PARAMETERS: obj_desc - Object to be converted. Must be an
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* Integer, Buffer, or String
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* result_desc - Where the new Integer object is returned
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* Flags - Used for string conversion
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*
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* RETURN: Status
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*
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* DESCRIPTION: Convert an ACPI Object to an integer.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_convert_to_integer (
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union acpi_operand_object *obj_desc,
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union acpi_operand_object **result_desc,
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u32 flags)
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{
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union acpi_operand_object *return_desc;
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u8 *pointer;
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acpi_integer result;
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u32 i;
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u32 count;
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acpi_status status;
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ACPI_FUNCTION_TRACE_PTR ("ex_convert_to_integer", obj_desc);
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switch (ACPI_GET_OBJECT_TYPE (obj_desc)) {
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case ACPI_TYPE_INTEGER:
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/* No conversion necessary */
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*result_desc = obj_desc;
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return_ACPI_STATUS (AE_OK);
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case ACPI_TYPE_BUFFER:
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case ACPI_TYPE_STRING:
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/* Note: Takes advantage of common buffer/string fields */
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pointer = obj_desc->buffer.pointer;
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count = obj_desc->buffer.length;
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break;
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default:
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return_ACPI_STATUS (AE_TYPE);
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}
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/*
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* Convert the buffer/string to an integer. Note that both buffers and
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* strings are treated as raw data - we don't convert ascii to hex for
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* strings.
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*
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* There are two terminating conditions for the loop:
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* 1) The size of an integer has been reached, or
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* 2) The end of the buffer or string has been reached
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*/
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result = 0;
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/* String conversion is different than Buffer conversion */
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switch (ACPI_GET_OBJECT_TYPE (obj_desc)) {
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case ACPI_TYPE_STRING:
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/*
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* Convert string to an integer - for most cases, the string must be
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* hexadecimal as per the ACPI specification. The only exception (as
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* of ACPI 3.0) is that the to_integer() operator allows both decimal
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* and hexadecimal strings (hex prefixed with "0x").
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*/
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status = acpi_ut_strtoul64 ((char *) pointer, flags, &result);
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if (ACPI_FAILURE (status)) {
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return_ACPI_STATUS (status);
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}
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break;
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case ACPI_TYPE_BUFFER:
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/* Check for zero-length buffer */
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if (!count) {
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return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
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}
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/* Transfer no more than an integer's worth of data */
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if (count > acpi_gbl_integer_byte_width) {
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count = acpi_gbl_integer_byte_width;
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}
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/*
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* Convert buffer to an integer - we simply grab enough raw data
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* from the buffer to fill an integer
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*/
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for (i = 0; i < count; i++) {
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/*
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* Get next byte and shift it into the Result.
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* Little endian is used, meaning that the first byte of the buffer
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* is the LSB of the integer
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*/
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result |= (((acpi_integer) pointer[i]) << (i * 8));
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}
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break;
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default:
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/* No other types can get here */
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break;
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}
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/* Create a new integer */
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return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
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if (!return_desc) {
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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/* Save the Result */
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return_desc->integer.value = result;
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acpi_ex_truncate_for32bit_table (return_desc);
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*result_desc = return_desc;
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return_ACPI_STATUS (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_convert_to_buffer
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*
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* PARAMETERS: obj_desc - Object to be converted. Must be an
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* Integer, Buffer, or String
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* result_desc - Where the new buffer object is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Convert an ACPI Object to a Buffer
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*
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******************************************************************************/
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acpi_status
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acpi_ex_convert_to_buffer (
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union acpi_operand_object *obj_desc,
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union acpi_operand_object **result_desc)
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{
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union acpi_operand_object *return_desc;
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u8 *new_buf;
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ACPI_FUNCTION_TRACE_PTR ("ex_convert_to_buffer", obj_desc);
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switch (ACPI_GET_OBJECT_TYPE (obj_desc)) {
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case ACPI_TYPE_BUFFER:
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/* No conversion necessary */
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*result_desc = obj_desc;
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return_ACPI_STATUS (AE_OK);
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case ACPI_TYPE_INTEGER:
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/*
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* Create a new Buffer object.
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* Need enough space for one integer
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*/
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return_desc = acpi_ut_create_buffer_object (acpi_gbl_integer_byte_width);
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if (!return_desc) {
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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/* Copy the integer to the buffer, LSB first */
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new_buf = return_desc->buffer.pointer;
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ACPI_MEMCPY (new_buf,
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&obj_desc->integer.value,
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acpi_gbl_integer_byte_width);
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break;
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case ACPI_TYPE_STRING:
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/*
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* Create a new Buffer object
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* Size will be the string length
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*
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* NOTE: Add one to the string length to include the null terminator.
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* The ACPI spec is unclear on this subject, but there is existing
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* ASL/AML code that depends on the null being transferred to the new
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* buffer.
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*/
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return_desc = acpi_ut_create_buffer_object (
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(acpi_size) obj_desc->string.length + 1);
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if (!return_desc) {
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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/* Copy the string to the buffer */
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new_buf = return_desc->buffer.pointer;
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ACPI_STRNCPY ((char *) new_buf, (char *) obj_desc->string.pointer,
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obj_desc->string.length);
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break;
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default:
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return_ACPI_STATUS (AE_TYPE);
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}
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/* Mark buffer initialized */
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return_desc->common.flags |= AOPOBJ_DATA_VALID;
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*result_desc = return_desc;
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return_ACPI_STATUS (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_convert_to_ascii
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*
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* PARAMETERS: Integer - Value to be converted
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* Base - ACPI_STRING_DECIMAL or ACPI_STRING_HEX
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* String - Where the string is returned
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* data_width - Size of data item to be converted, in bytes
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*
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* RETURN: Actual string length
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*
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* DESCRIPTION: Convert an ACPI Integer to a hex or decimal string
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*
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******************************************************************************/
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static u32
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acpi_ex_convert_to_ascii (
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acpi_integer integer,
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u16 base,
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u8 *string,
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u8 data_width)
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{
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acpi_integer digit;
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acpi_native_uint i;
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acpi_native_uint j;
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acpi_native_uint k = 0;
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acpi_native_uint hex_length;
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acpi_native_uint decimal_length;
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u32 remainder;
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u8 supress_zeros;
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ACPI_FUNCTION_ENTRY ();
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switch (base) {
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case 10:
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/* Setup max length for the decimal number */
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switch (data_width) {
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case 1:
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decimal_length = ACPI_MAX8_DECIMAL_DIGITS;
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break;
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case 4:
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decimal_length = ACPI_MAX32_DECIMAL_DIGITS;
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break;
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case 8:
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default:
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decimal_length = ACPI_MAX64_DECIMAL_DIGITS;
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break;
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}
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supress_zeros = TRUE; /* No leading zeros */
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remainder = 0;
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for (i = decimal_length; i > 0; i--) {
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/* Divide by nth factor of 10 */
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digit = integer;
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for (j = 0; j < i; j++) {
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(void) acpi_ut_short_divide (digit, 10, &digit, &remainder);
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}
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/* Handle leading zeros */
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if (remainder != 0) {
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supress_zeros = FALSE;
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}
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if (!supress_zeros) {
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string[k] = (u8) (ACPI_ASCII_ZERO + remainder);
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k++;
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}
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}
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break;
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case 16:
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/* hex_length: 2 ascii hex chars per data byte */
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hex_length = (acpi_native_uint) ACPI_MUL_2 (data_width);
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for (i = 0, j = (hex_length-1); i < hex_length; i++, j--) {
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/* Get one hex digit, most significant digits first */
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string[k] = (u8) acpi_ut_hex_to_ascii_char (integer, ACPI_MUL_4 (j));
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k++;
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}
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break;
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default:
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return (0);
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}
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/*
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* Since leading zeros are supressed, we must check for the case where
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* the integer equals 0
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*
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* Finally, null terminate the string and return the length
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*/
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if (!k) {
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string [0] = ACPI_ASCII_ZERO;
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k = 1;
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}
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string [k] = 0;
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return ((u32) k);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_convert_to_string
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*
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* PARAMETERS: obj_desc - Object to be converted. Must be an
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* Integer, Buffer, or String
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* result_desc - Where the string object is returned
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* Type - String flags (base and conversion type)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Convert an ACPI Object to a string
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*
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******************************************************************************/
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acpi_status
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acpi_ex_convert_to_string (
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union acpi_operand_object *obj_desc,
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union acpi_operand_object **result_desc,
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u32 type)
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{
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union acpi_operand_object *return_desc;
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u8 *new_buf;
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u32 i;
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u32 string_length = 0;
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u16 base = 16;
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u8 separator = ',';
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ACPI_FUNCTION_TRACE_PTR ("ex_convert_to_string", obj_desc);
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switch (ACPI_GET_OBJECT_TYPE (obj_desc)) {
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case ACPI_TYPE_STRING:
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/* No conversion necessary */
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*result_desc = obj_desc;
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return_ACPI_STATUS (AE_OK);
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case ACPI_TYPE_INTEGER:
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switch (type) {
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case ACPI_EXPLICIT_CONVERT_DECIMAL:
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/* Make room for maximum decimal number */
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string_length = ACPI_MAX_DECIMAL_DIGITS;
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base = 10;
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break;
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default:
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/* Two hex string characters for each integer byte */
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string_length = ACPI_MUL_2 (acpi_gbl_integer_byte_width);
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break;
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}
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/*
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* Create a new String
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* Need enough space for one ASCII integer (plus null terminator)
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*/
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return_desc = acpi_ut_create_string_object ((acpi_size) string_length);
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if (!return_desc) {
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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new_buf = return_desc->buffer.pointer;
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/* Convert integer to string */
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string_length = acpi_ex_convert_to_ascii (obj_desc->integer.value, base,
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new_buf, acpi_gbl_integer_byte_width);
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/* Null terminate at the correct place */
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return_desc->string.length = string_length;
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new_buf [string_length] = 0;
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break;
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case ACPI_TYPE_BUFFER:
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/* Setup string length, base, and separator */
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switch (type) {
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case ACPI_EXPLICIT_CONVERT_DECIMAL: /* Used by to_decimal_string */
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/*
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* From ACPI: "If Data is a buffer, it is converted to a string of
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* decimal values separated by commas."
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*/
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base = 10;
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/*
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* Calculate the final string length. Individual string values
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* are variable length (include separator for each)
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*/
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for (i = 0; i < obj_desc->buffer.length; i++) {
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if (obj_desc->buffer.pointer[i] >= 100) {
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string_length += 4;
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}
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else if (obj_desc->buffer.pointer[i] >= 10) {
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string_length += 3;
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}
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else {
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string_length += 2;
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}
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}
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break;
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case ACPI_IMPLICIT_CONVERT_HEX:
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/*
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* From the ACPI spec:
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*"The entire contents of the buffer are converted to a string of
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* two-character hexadecimal numbers, each separated by a space."
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*/
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separator = ' ';
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string_length = (obj_desc->buffer.length * 3);
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break;
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case ACPI_EXPLICIT_CONVERT_HEX: /* Used by to_hex_string */
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/*
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* From ACPI: "If Data is a buffer, it is converted to a string of
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* hexadecimal values separated by commas."
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*/
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string_length = (obj_desc->buffer.length * 3);
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break;
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default:
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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/*
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* Perform the conversion.
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* (-1 because of extra separator included in string_length from above)
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*/
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string_length--;
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if (string_length > ACPI_MAX_STRING_CONVERSION) /* ACPI limit */ {
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return_ACPI_STATUS (AE_AML_STRING_LIMIT);
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}
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/* Create a new string object and string buffer */
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return_desc = acpi_ut_create_string_object ((acpi_size) string_length);
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if (!return_desc) {
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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new_buf = return_desc->buffer.pointer;
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/*
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* Convert buffer bytes to hex or decimal values
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* (separated by commas or spaces)
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*/
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for (i = 0; i < obj_desc->buffer.length; i++) {
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new_buf += acpi_ex_convert_to_ascii (
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(acpi_integer) obj_desc->buffer.pointer[i], base,
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new_buf, 1);
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*new_buf++ = separator; /* each separated by a comma or space */
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}
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/*
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* Null terminate the string
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* (overwrites final comma/space from above)
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*/
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new_buf--;
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*new_buf = 0;
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break;
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default:
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return_ACPI_STATUS (AE_TYPE);
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}
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*result_desc = return_desc;
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return_ACPI_STATUS (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_convert_to_target_type
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*
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* PARAMETERS: destination_type - Current type of the destination
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* source_desc - Source object to be converted.
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* result_desc - Where the converted object is returned
|
|
* walk_state - Current method state
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Implements "implicit conversion" rules for storing an object.
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status
|
|
acpi_ex_convert_to_target_type (
|
|
acpi_object_type destination_type,
|
|
union acpi_operand_object *source_desc,
|
|
union acpi_operand_object **result_desc,
|
|
struct acpi_walk_state *walk_state)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
|
|
|
|
ACPI_FUNCTION_TRACE ("ex_convert_to_target_type");
|
|
|
|
|
|
/* Default behavior */
|
|
|
|
*result_desc = source_desc;
|
|
|
|
/*
|
|
* If required by the target,
|
|
* perform implicit conversion on the source before we store it.
|
|
*/
|
|
switch (GET_CURRENT_ARG_TYPE (walk_state->op_info->runtime_args)) {
|
|
case ARGI_SIMPLE_TARGET:
|
|
case ARGI_FIXED_TARGET:
|
|
case ARGI_INTEGER_REF: /* Handles Increment, Decrement cases */
|
|
|
|
switch (destination_type) {
|
|
case ACPI_TYPE_LOCAL_REGION_FIELD:
|
|
/*
|
|
* Named field can always handle conversions
|
|
*/
|
|
break;
|
|
|
|
default:
|
|
/* No conversion allowed for these types */
|
|
|
|
if (destination_type != ACPI_GET_OBJECT_TYPE (source_desc)) {
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
|
|
"Explicit operator, will store (%s) over existing type (%s)\n",
|
|
acpi_ut_get_object_type_name (source_desc),
|
|
acpi_ut_get_type_name (destination_type)));
|
|
status = AE_TYPE;
|
|
}
|
|
}
|
|
break;
|
|
|
|
|
|
case ARGI_TARGETREF:
|
|
|
|
switch (destination_type) {
|
|
case ACPI_TYPE_INTEGER:
|
|
case ACPI_TYPE_BUFFER_FIELD:
|
|
case ACPI_TYPE_LOCAL_BANK_FIELD:
|
|
case ACPI_TYPE_LOCAL_INDEX_FIELD:
|
|
/*
|
|
* These types require an Integer operand. We can convert
|
|
* a Buffer or a String to an Integer if necessary.
|
|
*/
|
|
status = acpi_ex_convert_to_integer (source_desc, result_desc,
|
|
16);
|
|
break;
|
|
|
|
|
|
case ACPI_TYPE_STRING:
|
|
/*
|
|
* The operand must be a String. We can convert an
|
|
* Integer or Buffer if necessary
|
|
*/
|
|
status = acpi_ex_convert_to_string (source_desc, result_desc,
|
|
ACPI_IMPLICIT_CONVERT_HEX);
|
|
break;
|
|
|
|
|
|
case ACPI_TYPE_BUFFER:
|
|
/*
|
|
* The operand must be a Buffer. We can convert an
|
|
* Integer or String if necessary
|
|
*/
|
|
status = acpi_ex_convert_to_buffer (source_desc, result_desc);
|
|
break;
|
|
|
|
|
|
default:
|
|
ACPI_REPORT_ERROR (("Bad destination type during conversion: %X\n",
|
|
destination_type));
|
|
status = AE_AML_INTERNAL;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
|
|
case ARGI_REFERENCE:
|
|
/*
|
|
* create_xxxx_field cases - we are storing the field object into the name
|
|
*/
|
|
break;
|
|
|
|
|
|
default:
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
|
|
"Unknown Target type ID 0x%X Op %s dest_type %s\n",
|
|
GET_CURRENT_ARG_TYPE (walk_state->op_info->runtime_args),
|
|
walk_state->op_info->name, acpi_ut_get_type_name (destination_type)));
|
|
|
|
ACPI_REPORT_ERROR (("Bad Target Type (ARGI): %X\n",
|
|
GET_CURRENT_ARG_TYPE (walk_state->op_info->runtime_args)))
|
|
status = AE_AML_INTERNAL;
|
|
}
|
|
|
|
/*
|
|
* Source-to-Target conversion semantics:
|
|
*
|
|
* If conversion to the target type cannot be performed, then simply
|
|
* overwrite the target with the new object and type.
|
|
*/
|
|
if (status == AE_TYPE) {
|
|
status = AE_OK;
|
|
}
|
|
|
|
return_ACPI_STATUS (status);
|
|
}
|
|
|
|
|