Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 327 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/utstrtoul64.c b/drivers/acpi/acpica/utstrtoul64.c
new file mode 100644
index 000000000..5fde619a8
--- /dev/null
+++ b/drivers/acpi/acpica/utstrtoul64.c
@@ -0,0 +1,327 @@
+// 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);
+}