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692 lines
17 KiB
692 lines
17 KiB
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
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/****************************************************************************** |
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* |
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* Module Name: exconvrt - Object conversion routines |
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* |
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* Copyright (C) 2000 - 2021, Intel Corp. |
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* |
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*****************************************************************************/ |
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|
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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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|
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#define _COMPONENT ACPI_EXECUTER |
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ACPI_MODULE_NAME("exconvrt") |
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|
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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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* |
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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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|
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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; |
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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 = |
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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 = |
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acpi_ex_convert_to_ascii(obj_desc->integer.value, base, |
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new_buf, |
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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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* Explicit conversion from the to_decimal_string ASL operator. |
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* |
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* From ACPI: "If the input is a buffer, it is converted to a |
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* a string of 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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} else if (obj_desc->buffer.pointer[i] >= 10) { |
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string_length += 3; |
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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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* Implicit buffer-to-string conversion |
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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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* Each hex number is prefixed with 0x (11/2018) |
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*/ |
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separator = ' '; |
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string_length = (obj_desc->buffer.length * 5); |
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break; |
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case ACPI_EXPLICIT_CONVERT_HEX: |
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/* |
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* Explicit conversion from the to_hex_string ASL operator. |
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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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* Each hex number is prefixed with 0x (11/2018) |
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*/ |
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separator = ','; |
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string_length = (obj_desc->buffer.length * 5); |
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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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* Create a new string object and string buffer |
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* (-1 because of extra separator included in string_length from above) |
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* Allow creation of zero-length strings from zero-length buffers. |
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*/ |
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if (string_length) { |
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string_length--; |
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} |
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return_desc = |
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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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if (base == 16) { |
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/* Emit 0x prefix for explicit/implicit hex conversion */ |
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*new_buf++ = '0'; |
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*new_buf++ = 'x'; |
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} |
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new_buf += acpi_ex_convert_to_ascii((u64) obj_desc-> |
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buffer.pointer[i], |
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base, new_buf, 1); |
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|
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/* Each digit is separated by either a comma or space */ |
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|
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*new_buf++ = separator; |
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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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if (obj_desc->buffer.length) { |
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new_buf--; |
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} |
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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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* |
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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 |
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* walk_state - Current method state |
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* |
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* RETURN: Status |
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* |
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* DESCRIPTION: Implements "implicit conversion" rules for storing an object. |
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* |
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******************************************************************************/ |
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|
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acpi_status |
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acpi_ex_convert_to_target_type(acpi_object_type destination_type, |
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union acpi_operand_object *source_desc, |
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union acpi_operand_object **result_desc, |
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struct acpi_walk_state *walk_state) |
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{ |
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acpi_status status = AE_OK; |
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|
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ACPI_FUNCTION_TRACE(ex_convert_to_target_type); |
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|
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/* Default behavior */ |
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*result_desc = source_desc; |
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|
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/* |
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* If required by the target, |
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* perform implicit conversion on the source before we store it. |
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*/ |
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switch (GET_CURRENT_ARG_TYPE(walk_state->op_info->runtime_args)) { |
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case ARGI_SIMPLE_TARGET: |
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case ARGI_FIXED_TARGET: |
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case ARGI_INTEGER_REF: /* Handles Increment, Decrement cases */ |
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|
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switch (destination_type) { |
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case ACPI_TYPE_LOCAL_REGION_FIELD: |
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/* |
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* Named field can always handle conversions |
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*/ |
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break; |
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|
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default: |
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|
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/* No conversion allowed for these types */ |
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|
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if (destination_type != source_desc->common.type) { |
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
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"Explicit operator, will store (%s) over existing type (%s)\n", |
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acpi_ut_get_object_type_name |
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(source_desc), |
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acpi_ut_get_type_name |
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(destination_type))); |
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status = AE_TYPE; |
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} |
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} |
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break; |
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|
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case ARGI_TARGETREF: |
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case ARGI_STORE_TARGET: |
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|
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switch (destination_type) { |
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case ACPI_TYPE_INTEGER: |
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case ACPI_TYPE_BUFFER_FIELD: |
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case ACPI_TYPE_LOCAL_BANK_FIELD: |
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case ACPI_TYPE_LOCAL_INDEX_FIELD: |
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/* |
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* These types require an Integer operand. We can convert |
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* a Buffer or a String to an Integer if necessary. |
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*/ |
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status = |
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acpi_ex_convert_to_integer(source_desc, result_desc, |
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ACPI_IMPLICIT_CONVERSION); |
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break; |
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|
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case ACPI_TYPE_STRING: |
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/* |
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* The operand must be a String. We can convert an |
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* Integer or Buffer if necessary |
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*/ |
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status = |
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acpi_ex_convert_to_string(source_desc, result_desc, |
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ACPI_IMPLICIT_CONVERT_HEX); |
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break; |
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|
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case ACPI_TYPE_BUFFER: |
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/* |
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* The operand must be a Buffer. We can convert an |
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* Integer or String if necessary |
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*/ |
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status = |
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acpi_ex_convert_to_buffer(source_desc, result_desc); |
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break; |
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|
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default: |
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|
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ACPI_ERROR((AE_INFO, |
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"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); |
|
}
|
|
|