693 lines
17 KiB
C
693 lines
17 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: exconvrt - Object conversion routines
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*
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* Copyright (C) 2000 - 2022, 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 "acinterp.h"
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#include "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(u64 integer, u16 base, u8 *string, 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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* implicit_conversion - 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(union acpi_operand_object *obj_desc,
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union acpi_operand_object **result_desc,
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u32 implicit_conversion)
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{
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union acpi_operand_object *return_desc;
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u8 *pointer;
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u64 result;
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u32 i;
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u32 count;
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ACPI_FUNCTION_TRACE_PTR(ex_convert_to_integer, obj_desc);
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switch (obj_desc->common.type) {
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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 (obj_desc->common.type) {
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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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* Explicit conversion is used only by to_integer.
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* All other string-to-integer conversions are implicit conversions.
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*/
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if (implicit_conversion) {
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result =
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acpi_ut_implicit_strtoul64(ACPI_CAST_PTR
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(char, pointer));
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} else {
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result =
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acpi_ut_explicit_strtoul64(ACPI_CAST_PTR
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(char, pointer));
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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 |= (((u64) 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_integer_object(result);
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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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ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Converted value: %8.8X%8.8X\n",
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ACPI_FORMAT_UINT64(result)));
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/* Save the Result */
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(void)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(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 (obj_desc->common.type) {
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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 =
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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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memcpy(new_buf, &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((acpi_size)
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obj_desc->string.
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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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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(u64 integer, u16 base, u8 *string, u8 data_width)
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{
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u64 digit;
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u32 i;
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u32 j;
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u32 k = 0;
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u32 hex_length;
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u32 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,
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&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 = (data_width * 2);
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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)
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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 suppressed, 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. Supports both implicit
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* and explicit conversions and related rules.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_convert_to_string(union acpi_operand_object * obj_desc,
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union acpi_operand_object ** result_desc, 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 (obj_desc->common.type) {
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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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/*
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* From to_decimal_string, integer source.
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*
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* Make room for the maximum decimal number size
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*/
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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;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Create a new String
|
||
|
|
* Need enough space for one ASCII integer (plus null terminator)
|
||
|
|
*/
|
||
|
|
return_desc =
|
||
|
|
acpi_ut_create_string_object((acpi_size)string_length);
|
||
|
|
if (!return_desc) {
|
||
|
|
return_ACPI_STATUS(AE_NO_MEMORY);
|
||
|
|
}
|
||
|
|
|
||
|
|
new_buf = return_desc->buffer.pointer;
|
||
|
|
|
||
|
|
/* Convert integer to string */
|
||
|
|
|
||
|
|
string_length =
|
||
|
|
acpi_ex_convert_to_ascii(obj_desc->integer.value, base,
|
||
|
|
new_buf,
|
||
|
|
acpi_gbl_integer_byte_width);
|
||
|
|
|
||
|
|
/* Null terminate at the correct place */
|
||
|
|
|
||
|
|
return_desc->string.length = string_length;
|
||
|
|
new_buf[string_length] = 0;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case ACPI_TYPE_BUFFER:
|
||
|
|
|
||
|
|
/* Setup string length, base, and separator */
|
||
|
|
|
||
|
|
switch (type) {
|
||
|
|
case ACPI_EXPLICIT_CONVERT_DECIMAL: /* Used by to_decimal_string */
|
||
|
|
/*
|
||
|
|
* Explicit conversion from the to_decimal_string ASL operator.
|
||
|
|
*
|
||
|
|
* From ACPI: "If the input is a buffer, it is converted to a
|
||
|
|
* a string of decimal values separated by commas."
|
||
|
|
*/
|
||
|
|
base = 10;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Calculate the final string length. Individual string values
|
||
|
|
* are variable length (include separator for each)
|
||
|
|
*/
|
||
|
|
for (i = 0; i < obj_desc->buffer.length; i++) {
|
||
|
|
if (obj_desc->buffer.pointer[i] >= 100) {
|
||
|
|
string_length += 4;
|
||
|
|
} else if (obj_desc->buffer.pointer[i] >= 10) {
|
||
|
|
string_length += 3;
|
||
|
|
} else {
|
||
|
|
string_length += 2;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case ACPI_IMPLICIT_CONVERT_HEX:
|
||
|
|
/*
|
||
|
|
* Implicit buffer-to-string conversion
|
||
|
|
*
|
||
|
|
* From the ACPI spec:
|
||
|
|
* "The entire contents of the buffer are converted to a string of
|
||
|
|
* two-character hexadecimal numbers, each separated by a space."
|
||
|
|
*
|
||
|
|
* Each hex number is prefixed with 0x (11/2018)
|
||
|
|
*/
|
||
|
|
separator = ' ';
|
||
|
|
string_length = (obj_desc->buffer.length * 5);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case ACPI_EXPLICIT_CONVERT_HEX:
|
||
|
|
/*
|
||
|
|
* Explicit conversion from the to_hex_string ASL operator.
|
||
|
|
*
|
||
|
|
* From ACPI: "If Data is a buffer, it is converted to a string of
|
||
|
|
* hexadecimal values separated by commas."
|
||
|
|
*
|
||
|
|
* Each hex number is prefixed with 0x (11/2018)
|
||
|
|
*/
|
||
|
|
separator = ',';
|
||
|
|
string_length = (obj_desc->buffer.length * 5);
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
return_ACPI_STATUS(AE_BAD_PARAMETER);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Create a new string object and string buffer
|
||
|
|
* (-1 because of extra separator included in string_length from above)
|
||
|
|
* Allow creation of zero-length strings from zero-length buffers.
|
||
|
|
*/
|
||
|
|
if (string_length) {
|
||
|
|
string_length--;
|
||
|
|
}
|
||
|
|
|
||
|
|
return_desc =
|
||
|
|
acpi_ut_create_string_object((acpi_size)string_length);
|
||
|
|
if (!return_desc) {
|
||
|
|
return_ACPI_STATUS(AE_NO_MEMORY);
|
||
|
|
}
|
||
|
|
|
||
|
|
new_buf = return_desc->buffer.pointer;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Convert buffer bytes to hex or decimal values
|
||
|
|
* (separated by commas or spaces)
|
||
|
|
*/
|
||
|
|
for (i = 0; i < obj_desc->buffer.length; i++) {
|
||
|
|
if (base == 16) {
|
||
|
|
|
||
|
|
/* Emit 0x prefix for explicit/implicit hex conversion */
|
||
|
|
|
||
|
|
*new_buf++ = '0';
|
||
|
|
*new_buf++ = 'x';
|
||
|
|
}
|
||
|
|
|
||
|
|
new_buf += acpi_ex_convert_to_ascii((u64) obj_desc->
|
||
|
|
buffer.pointer[i],
|
||
|
|
base, new_buf, 1);
|
||
|
|
|
||
|
|
/* Each digit is separated by either a comma or space */
|
||
|
|
|
||
|
|
*new_buf++ = separator;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Null terminate the string
|
||
|
|
* (overwrites final comma/space from above)
|
||
|
|
*/
|
||
|
|
if (obj_desc->buffer.length) {
|
||
|
|
new_buf--;
|
||
|
|
}
|
||
|
|
*new_buf = 0;
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
|
||
|
|
return_ACPI_STATUS(AE_TYPE);
|
||
|
|
}
|
||
|
|
|
||
|
|
*result_desc = return_desc;
|
||
|
|
return_ACPI_STATUS(AE_OK);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*******************************************************************************
|
||
|
|
*
|
||
|
|
* FUNCTION: acpi_ex_convert_to_target_type
|
||
|
|
*
|
||
|
|
* PARAMETERS: destination_type - Current type of the destination
|
||
|
|
* source_desc - Source object to be converted.
|
||
|
|
* 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 != source_desc->common.type) {
|
||
|
|
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:
|
||
|
|
case ARGI_STORE_TARGET:
|
||
|
|
|
||
|
|
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,
|
||
|
|
ACPI_IMPLICIT_CONVERSION);
|
||
|
|
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_ERROR((AE_INFO,
|
||
|
|
"Bad destination type during conversion: 0x%X",
|
||
|
|
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_ERROR((AE_INFO,
|
||
|
|
"Unknown Target type ID 0x%X AmlOpcode 0x%X DestType %s",
|
||
|
|
GET_CURRENT_ARG_TYPE(walk_state->op_info->
|
||
|
|
runtime_args),
|
||
|
|
walk_state->opcode,
|
||
|
|
acpi_ut_get_type_name(destination_type)));
|
||
|
|
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);
|
||
|
|
}
|