mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-21 07:37:36 +07:00
089b2bec97
acpi_ut_implicit_strtoul64() called acpi_ut_detect_hex_prefix() and ignored the return value. Instead, use acpi_ut_remove_hex_prefix(). Signed-off-by: Erik Schmauss <erik.schmauss@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
328 lines
12 KiB
C
328 lines
12 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
|
|
/*******************************************************************************
|
|
*
|
|
* Module Name: utstrtoul64 - String-to-integer conversion support for both
|
|
* 64-bit and 32-bit integers
|
|
*
|
|
******************************************************************************/
|
|
|
|
#include <acpi/acpi.h>
|
|
#include "accommon.h"
|
|
|
|
#define _COMPONENT ACPI_UTILITIES
|
|
ACPI_MODULE_NAME("utstrtoul64")
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* This module contains the top-level string to 64/32-bit unsigned integer
|
|
* conversion functions:
|
|
*
|
|
* 1) A standard strtoul() function that supports 64-bit integers, base
|
|
* 8/10/16, with integer overflow support. This is used mainly by the
|
|
* iASL compiler, which implements tighter constraints on integer
|
|
* constants than the runtime (interpreter) integer-to-string conversions.
|
|
* 2) Runtime "Explicit conversion" as defined in the ACPI specification.
|
|
* 3) Runtime "Implicit conversion" as defined in the ACPI specification.
|
|
*
|
|
* Current users of this module:
|
|
*
|
|
* iASL - Preprocessor (constants and math expressions)
|
|
* iASL - Main parser, conversion of constants to integers
|
|
* iASL - Data Table Compiler parser (constants and math expressions)
|
|
* interpreter - Implicit and explicit conversions, GPE method names
|
|
* interpreter - Repair code for return values from predefined names
|
|
* debugger - Command line input string conversion
|
|
* acpi_dump - ACPI table physical addresses
|
|
* acpi_exec - Support for namespace overrides
|
|
*
|
|
* Notes concerning users of these interfaces:
|
|
*
|
|
* acpi_gbl_integer_byte_width is used to set the 32/64 bit limit for explicit
|
|
* and implicit conversions. This global must be set to the proper width.
|
|
* For the core ACPICA code, the width depends on the DSDT version. For the
|
|
* acpi_ut_strtoul64 interface, all conversions are 64 bits. This interface is
|
|
* used primarily for iASL, where the default width is 64 bits for all parsers,
|
|
* but error checking is performed later to flag cases where a 64-bit constant
|
|
* is wrongly defined in a 32-bit DSDT/SSDT.
|
|
*
|
|
* In ACPI, the only place where octal numbers are supported is within
|
|
* the ASL language itself. This is implemented via the main acpi_ut_strtoul64
|
|
* interface. According the ACPI specification, there is no ACPI runtime
|
|
* support (explicit/implicit) for octal string conversions.
|
|
*
|
|
******************************************************************************/
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ut_strtoul64
|
|
*
|
|
* PARAMETERS: string - Null terminated input string,
|
|
* must be a valid pointer
|
|
* return_value - Where the converted integer is
|
|
* returned. Must be a valid pointer
|
|
*
|
|
* RETURN: Status and converted integer. Returns an exception on a
|
|
* 64-bit numeric overflow
|
|
*
|
|
* DESCRIPTION: Convert a string into an unsigned integer. Always performs a
|
|
* full 64-bit conversion, regardless of the current global
|
|
* integer width. Supports Decimal, Hex, and Octal strings.
|
|
*
|
|
* Current users of this function:
|
|
*
|
|
* iASL - Preprocessor (constants and math expressions)
|
|
* iASL - Main ASL parser, conversion of ASL constants to integers
|
|
* iASL - Data Table Compiler parser (constants and math expressions)
|
|
* interpreter - Repair code for return values from predefined names
|
|
* acpi_dump - ACPI table physical addresses
|
|
* acpi_exec - Support for namespace overrides
|
|
*
|
|
******************************************************************************/
|
|
acpi_status acpi_ut_strtoul64(char *string, u64 *return_value)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
u8 original_bit_width;
|
|
u32 base = 10; /* Default is decimal */
|
|
|
|
ACPI_FUNCTION_TRACE_STR(ut_strtoul64, string);
|
|
|
|
*return_value = 0;
|
|
|
|
/* A NULL return string returns a value of zero */
|
|
|
|
if (*string == 0) {
|
|
return_ACPI_STATUS(AE_OK);
|
|
}
|
|
|
|
if (!acpi_ut_remove_whitespace(&string)) {
|
|
return_ACPI_STATUS(AE_OK);
|
|
}
|
|
|
|
/*
|
|
* 1) Check for a hex constant. A "0x" prefix indicates base 16.
|
|
*/
|
|
if (acpi_ut_detect_hex_prefix(&string)) {
|
|
base = 16;
|
|
}
|
|
|
|
/*
|
|
* 2) Check for an octal constant, defined to be a leading zero
|
|
* followed by sequence of octal digits (0-7)
|
|
*/
|
|
else if (acpi_ut_detect_octal_prefix(&string)) {
|
|
base = 8;
|
|
}
|
|
|
|
if (!acpi_ut_remove_leading_zeros(&string)) {
|
|
return_ACPI_STATUS(AE_OK); /* Return value 0 */
|
|
}
|
|
|
|
/*
|
|
* Force a full 64-bit conversion. The caller (usually iASL) must
|
|
* check for a 32-bit overflow later as necessary (If current mode
|
|
* is 32-bit, meaning a 32-bit DSDT).
|
|
*/
|
|
original_bit_width = acpi_gbl_integer_bit_width;
|
|
acpi_gbl_integer_bit_width = 64;
|
|
|
|
/*
|
|
* Perform the base 8, 10, or 16 conversion. A 64-bit numeric overflow
|
|
* will return an exception (to allow iASL to flag the statement).
|
|
*/
|
|
switch (base) {
|
|
case 8:
|
|
status = acpi_ut_convert_octal_string(string, return_value);
|
|
break;
|
|
|
|
case 10:
|
|
status = acpi_ut_convert_decimal_string(string, return_value);
|
|
break;
|
|
|
|
case 16:
|
|
default:
|
|
status = acpi_ut_convert_hex_string(string, return_value);
|
|
break;
|
|
}
|
|
|
|
/* Only possible exception from above is a 64-bit overflow */
|
|
|
|
acpi_gbl_integer_bit_width = original_bit_width;
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ut_implicit_strtoul64
|
|
*
|
|
* PARAMETERS: string - Null terminated input string,
|
|
* must be a valid pointer
|
|
*
|
|
* RETURN: Converted integer
|
|
*
|
|
* DESCRIPTION: Perform a 64-bit conversion with restrictions placed upon
|
|
* an "implicit conversion" by the ACPI specification. Used by
|
|
* many ASL operators that require an integer operand, and support
|
|
* an automatic (implicit) conversion from a string operand
|
|
* to the final integer operand. The major restriction is that
|
|
* only hex strings are supported.
|
|
*
|
|
* -----------------------------------------------------------------------------
|
|
*
|
|
* Base is always 16, either with or without the 0x prefix. Decimal and
|
|
* Octal strings are not supported, as per the ACPI specification.
|
|
*
|
|
* Examples (both are hex values):
|
|
* Add ("BA98", Arg0, Local0)
|
|
* Subtract ("0x12345678", Arg1, Local1)
|
|
*
|
|
* Conversion rules as extracted from the ACPI specification:
|
|
*
|
|
* The converted integer is initialized to the value zero.
|
|
* The ASCII string is always interpreted as a hexadecimal constant.
|
|
*
|
|
* 1) According to the ACPI specification, a "0x" prefix is not allowed.
|
|
* However, ACPICA allows this as an ACPI extension on general
|
|
* principle. (NO ERROR)
|
|
*
|
|
* 2) The conversion terminates when the size of an integer is reached
|
|
* (32 or 64 bits). There are no numeric overflow conditions. (NO ERROR)
|
|
*
|
|
* 3) The first non-hex character terminates the conversion and returns
|
|
* the current accumulated value of the converted integer (NO ERROR).
|
|
*
|
|
* 4) Conversion of a null (zero-length) string to an integer is
|
|
* technically not allowed. However, ACPICA allows this as an ACPI
|
|
* extension. The conversion returns the value 0. (NO ERROR)
|
|
*
|
|
* NOTE: There are no error conditions returned by this function. At
|
|
* the minimum, a value of zero is returned.
|
|
*
|
|
* Current users of this function:
|
|
*
|
|
* interpreter - All runtime implicit conversions, as per ACPI specification
|
|
* iASL - Data Table Compiler parser (constants and math expressions)
|
|
*
|
|
******************************************************************************/
|
|
|
|
u64 acpi_ut_implicit_strtoul64(char *string)
|
|
{
|
|
u64 converted_integer = 0;
|
|
|
|
ACPI_FUNCTION_TRACE_STR(ut_implicit_strtoul64, string);
|
|
|
|
if (!acpi_ut_remove_whitespace(&string)) {
|
|
return_VALUE(0);
|
|
}
|
|
|
|
/*
|
|
* Per the ACPI specification, only hexadecimal is supported for
|
|
* implicit conversions, and the "0x" prefix is "not allowed".
|
|
* However, allow a "0x" prefix as an ACPI extension.
|
|
*/
|
|
acpi_ut_remove_hex_prefix(&string);
|
|
|
|
if (!acpi_ut_remove_leading_zeros(&string)) {
|
|
return_VALUE(0);
|
|
}
|
|
|
|
/*
|
|
* Ignore overflow as per the ACPI specification. This is implemented by
|
|
* ignoring the return status from the conversion function called below.
|
|
* On overflow, the input string is simply truncated.
|
|
*/
|
|
acpi_ut_convert_hex_string(string, &converted_integer);
|
|
return_VALUE(converted_integer);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ut_explicit_strtoul64
|
|
*
|
|
* PARAMETERS: string - Null terminated input string,
|
|
* must be a valid pointer
|
|
*
|
|
* RETURN: Converted integer
|
|
*
|
|
* DESCRIPTION: Perform a 64-bit conversion with the restrictions placed upon
|
|
* an "explicit conversion" by the ACPI specification. The
|
|
* main restriction is that only hex and decimal are supported.
|
|
*
|
|
* -----------------------------------------------------------------------------
|
|
*
|
|
* Base is either 10 (default) or 16 (with 0x prefix). Octal (base 8) strings
|
|
* are not supported, as per the ACPI specification.
|
|
*
|
|
* Examples:
|
|
* to_integer ("1000") Decimal
|
|
* to_integer ("0xABCD") Hex
|
|
*
|
|
* Conversion rules as extracted from the ACPI specification:
|
|
*
|
|
* 1) The input string is either a decimal or hexadecimal numeric string.
|
|
* A hex value must be prefixed by "0x" or it is interpreted as decimal.
|
|
*
|
|
* 2) The value must not exceed the maximum of an integer value
|
|
* (32 or 64 bits). The ACPI specification states the behavior is
|
|
* "unpredictable", so ACPICA matches the behavior of the implicit
|
|
* conversion case. There are no numeric overflow conditions. (NO ERROR)
|
|
*
|
|
* 3) Behavior on the first non-hex character is not defined by the ACPI
|
|
* specification (for the to_integer operator), so ACPICA matches the
|
|
* behavior of the implicit conversion case. It terminates the
|
|
* conversion and returns the current accumulated value of the converted
|
|
* integer. (NO ERROR)
|
|
*
|
|
* 4) Conversion of a null (zero-length) string to an integer is
|
|
* technically not allowed. However, ACPICA allows this as an ACPI
|
|
* extension. The conversion returns the value 0. (NO ERROR)
|
|
*
|
|
* NOTE: There are no error conditions returned by this function. At the
|
|
* minimum, a value of zero is returned.
|
|
*
|
|
* Current users of this function:
|
|
*
|
|
* interpreter - Runtime ASL to_integer operator, as per the ACPI specification
|
|
*
|
|
******************************************************************************/
|
|
|
|
u64 acpi_ut_explicit_strtoul64(char *string)
|
|
{
|
|
u64 converted_integer = 0;
|
|
u32 base = 10; /* Default is decimal */
|
|
|
|
ACPI_FUNCTION_TRACE_STR(ut_explicit_strtoul64, string);
|
|
|
|
if (!acpi_ut_remove_whitespace(&string)) {
|
|
return_VALUE(0);
|
|
}
|
|
|
|
/*
|
|
* Only Hex and Decimal are supported, as per the ACPI specification.
|
|
* A "0x" prefix indicates hex; otherwise decimal is assumed.
|
|
*/
|
|
if (acpi_ut_detect_hex_prefix(&string)) {
|
|
base = 16;
|
|
}
|
|
|
|
if (!acpi_ut_remove_leading_zeros(&string)) {
|
|
return_VALUE(0);
|
|
}
|
|
|
|
/*
|
|
* Ignore overflow as per the ACPI specification. This is implemented by
|
|
* ignoring the return status from the conversion functions called below.
|
|
* On overflow, the input string is simply truncated.
|
|
*/
|
|
switch (base) {
|
|
case 10:
|
|
default:
|
|
acpi_ut_convert_decimal_string(string, &converted_integer);
|
|
break;
|
|
|
|
case 16:
|
|
acpi_ut_convert_hex_string(string, &converted_integer);
|
|
break;
|
|
}
|
|
|
|
return_VALUE(converted_integer);
|
|
}
|