1 files changed, 348 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/utstrtoul64.c b/drivers/acpi/acpica/utstrtoul64.c
new file mode 100644
index 000000000000..b4f341c98a95
--- /dev/null
+++ b/drivers/acpi/acpica/utstrtoul64.c
@@ -0,0 +1,348 @@
+/*******************************************************************************
+ *
+ * Module Name: utstrtoul64 - string to 64-bit integer support
+ *
+ ******************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2016, Intel Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+
+/*******************************************************************************
+ *
+ * The functions in this module satisfy the need for 64-bit string-to-integer
+ * conversions on both 32-bit and 64-bit platforms.
+ *
+ ******************************************************************************/
+
+#define _COMPONENT          ACPI_UTILITIES
+ACPI_MODULE_NAME("utstrtoul64")
+
+/* Local prototypes */
+static u64 acpi_ut_strtoul_base10(char *string, u32 flags);
+
+static u64 acpi_ut_strtoul_base16(char *string, u32 flags);
+
+/*******************************************************************************
+ *
+ * String conversion rules as written in the ACPI specification. The error
+ * conditions and behavior are different depending on the type of conversion.
+ *
+ *
+ * Implicit data type conversion: string-to-integer
+ * --------------------------------------------------
+ *
+ * Base is always 16. This is the ACPI_STRTOUL_BASE16 case.
+ *
+ * Example:
+ *      Add ("BA98", Arg0, Local0)
+ *
+ * The integer is initialized to the value zero.
+ * The ASCII string is interpreted as a hexadecimal constant.
+ *
+ *  1)  A "0x" prefix is not allowed. However, ACPICA allows this for
+ *      compatibility with previous ACPICA. (NO ERROR)
+ *
+ *  2)  Terminates when the size of an integer is reached (32 or 64 bits).
+ *      (NO ERROR)
+ *
+ *  3)  The first non-hex character terminates the conversion without error.
+ *      (NO ERROR)
+ *
+ *  4)  Conversion of a null (zero-length) string to an integer is not
+ *      allowed. However, ACPICA allows this for compatibility with previous
+ *      ACPICA. This conversion returns the value 0. (NO ERROR)
+ *
+ *
+ * Explicit data type conversion:  to_integer() with string operand
+ * ---------------------------------------------------------------
+ *
+ * Base is either 10 (default) or 16 (with 0x prefix)
+ *
+ * Examples:
+ *      to_integer ("1000")
+ *      to_integer ("0xABCD")
+ *
+ *  1)  Can be (must be) either a decimal or hexadecimal numeric string.
+ *      A hex value must be prefixed by "0x" or it is interpreted as a decimal.
+ *
+ *  2)  The value must not exceed the maximum of an integer value. ACPI spec
+ *      states the behavior is "unpredictable", so ACPICA matches the behavior
+ *      of the implicit conversion case.(NO ERROR)
+ *
+ *  3)  Behavior on the first non-hex character is not specified by the ACPI
+ *      spec, so ACPICA matches the behavior of the implicit conversion case
+ *      and terminates. (NO ERROR)
+ *
+ *  4)  A null (zero-length) string is illegal.
+ *      However, ACPICA allows this for compatibility with previous ACPICA.
+ *      This conversion returns the value 0. (NO ERROR)
+ *
+ ******************************************************************************/
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_strtoul64
+ *
+ * PARAMETERS:  string                  - Null terminated input string
+ *              flags                   - Conversion info, see below
+ *              return_value            - Where the converted integer is
+ *                                        returned
+ *
+ * RETURN:      Status and Converted value
+ *
+ * DESCRIPTION: Convert a string into an unsigned value. Performs either a
+ *              32-bit or 64-bit conversion, depending on the input integer
+ *              size in Flags (often the current mode of the interpreter).
+ *
+ * Values for Flags:
+ *      ACPI_STRTOUL_32BIT      - Max integer value is 32 bits
+ *      ACPI_STRTOUL_64BIT      - Max integer value is 64 bits
+ *      ACPI_STRTOUL_BASE16     - Input string is hexadecimal. Default
+ *                                is 10/16 based on string prefix (0x).
+ *
+ * NOTES:
+ *   Negative numbers are not supported, as they are not supported by ACPI.
+ *
+ *   Supports only base 16 or base 10 strings/values. Does not
+ *   support Octal strings, as these are not supported by ACPI.
+ *
+ * Current users of this support:
+ *
+ *  interpreter - Implicit and explicit conversions, GPE method names
+ *  debugger    - Command line input string conversion
+ *  iASL        - Main parser, conversion of constants to integers
+ *  iASL        - Data Table Compiler parser (constant math expressions)
+ *  iASL        - Preprocessor (constant math expressions)
+ *  acpi_dump   - Input table addresses
+ *  acpi_exec   - Testing of the acpi_ut_strtoul64 function
+ *
+ * Note concerning callers:
+ *   acpi_gbl_integer_byte_width can be used to set the 32/64 limit. If used,
+ *   this global should be set to the proper width. For the core ACPICA code,
+ *   this width depends on the DSDT version. For iASL, the default byte
+ *   width is always 8 for the parser, but error checking is performed later
+ *   to flag cases where a 64-bit constant is defined in a 32-bit DSDT/SSDT.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_strtoul64(char *string, u32 flags, u64 *return_value)
+{
+	acpi_status status = AE_OK;
+	u32 base;
+
+	ACPI_FUNCTION_TRACE_STR(ut_strtoul64, string);
+
+	/* Parameter validation */
+
+	if (!string || !return_value) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	*return_value = 0;
+
+	/* Check for zero-length string, returns 0 */
+
+	if (*string == 0) {
+		return_ACPI_STATUS(AE_OK);
+	}
+
+	/* Skip over any white space at start of string */
+
+	while (isspace((int)*string)) {
+		string++;
+	}
+
+	/* End of string? return 0 */
+
+	if (*string == 0) {
+		return_ACPI_STATUS(AE_OK);
+	}
+
+	/*
+	 * 1) The "0x" prefix indicates base 16. Per the ACPI specification,
+	 * the "0x" prefix is only allowed for implicit (non-strict) conversions.
+	 * However, we always allow it for compatibility with older ACPICA.
+	 */
+	if ((*string == ACPI_ASCII_ZERO) &&
+	    (tolower((int)*(string + 1)) == 'x')) {
+		string += 2;	/* Go past the 0x */
+		if (*string == 0) {
+			return_ACPI_STATUS(AE_OK);	/* Return value 0 */
+		}
+
+		base = 16;
+	}
+
+	/* 2) Force to base 16 (implicit conversion case) */
+
+	else if (flags & ACPI_STRTOUL_BASE16) {
+		base = 16;
+	}
+
+	/* 3) Default fallback is to Base 10 */
+
+	else {
+		base = 10;
+	}
+
+	/* Skip all leading zeros */
+
+	while (*string == ACPI_ASCII_ZERO) {
+		string++;
+		if (*string == 0) {
+			return_ACPI_STATUS(AE_OK);	/* Return value 0 */
+		}
+	}
+
+	/* Perform the base 16 or 10 conversion */
+
+	if (base == 16) {
+		*return_value = acpi_ut_strtoul_base16(string, flags);
+	} else {
+		*return_value = acpi_ut_strtoul_base10(string, flags);
+	}
+
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_strtoul_base10
+ *
+ * PARAMETERS:  string                  - Null terminated input string
+ *              flags                   - Conversion info
+ *
+ * RETURN:      64-bit converted integer
+ *
+ * DESCRIPTION: Performs a base 10 conversion of the input string to an
+ *              integer value, either 32 or 64 bits.
+ *              Note: String must be valid and non-null.
+ *
+ ******************************************************************************/
+
+static u64 acpi_ut_strtoul_base10(char *string, u32 flags)
+{
+	int ascii_digit;
+	u64 next_value;
+	u64 return_value = 0;
+
+	/* Main loop: convert each ASCII byte in the input string */
+
+	while (*string) {
+		ascii_digit = *string;
+		if (!isdigit(ascii_digit)) {
+
+			/* Not ASCII 0-9, terminate */
+
+			goto exit;
+		}
+
+		/* Convert and insert (add) the decimal digit */
+
+		next_value =
+		    (return_value * 10) + (ascii_digit - ACPI_ASCII_ZERO);
+
+		/* Check for overflow (32 or 64 bit) - return current converted value */
+
+		if (((flags & ACPI_STRTOUL_32BIT) && (next_value > ACPI_UINT32_MAX)) || (next_value < return_value)) {	/* 64-bit overflow case */
+			goto exit;
+		}
+
+		return_value = next_value;
+		string++;
+	}
+
+exit:
+	return (return_value);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_strtoul_base16
+ *
+ * PARAMETERS:  string                  - Null terminated input string
+ *              flags                   - conversion info
+ *
+ * RETURN:      64-bit converted integer
+ *
+ * DESCRIPTION: Performs a base 16 conversion of the input string to an
+ *              integer value, either 32 or 64 bits.
+ *              Note: String must be valid and non-null.
+ *
+ ******************************************************************************/
+
+static u64 acpi_ut_strtoul_base16(char *string, u32 flags)
+{
+	int ascii_digit;
+	u32 valid_digits = 1;
+	u64 return_value = 0;
+
+	/* Main loop: convert each ASCII byte in the input string */
+
+	while (*string) {
+
+		/* Check for overflow (32 or 64 bit) - return current converted value */
+
+		if ((valid_digits > 16) ||
+		    ((valid_digits > 8) && (flags & ACPI_STRTOUL_32BIT))) {
+			goto exit;
+		}
+
+		ascii_digit = *string;
+		if (!isxdigit(ascii_digit)) {
+
+			/* Not Hex ASCII A-F, a-f, or 0-9, terminate */
+
+			goto exit;
+		}
+
+		/* Convert and insert the hex digit */
+
+		return_value =
+		    (return_value << 4) |
+		    acpi_ut_ascii_char_to_hex(ascii_digit);
+
+		string++;
+		valid_digits++;
+	}
+
+exit:
+	return (return_value);
+}