1 files changed, 443 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/utstrsuppt.c b/drivers/acpi/acpica/utstrsuppt.c
new file mode 100644
index 000000000..2d91003fc
--- /dev/null
+++ b/drivers/acpi/acpica/utstrsuppt.c
@@ -0,0 +1,443 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/*******************************************************************************
+ *
+ * Module Name: utstrsuppt - Support functions for string-to-integer conversion
+ *
+ ******************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+
+#define _COMPONENT          ACPI_UTILITIES
+ACPI_MODULE_NAME("utstrsuppt")
+
+/* Local prototypes */
+static acpi_status
+acpi_ut_insert_digit(u64 *accumulated_value, u32 base, int ascii_digit);
+
+static acpi_status
+acpi_ut_strtoul_multiply64(u64 multiplicand, u32 base, u64 *out_product);
+
+static acpi_status acpi_ut_strtoul_add64(u64 addend1, u32 digit, u64 *out_sum);
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_convert_octal_string
+ *
+ * PARAMETERS:  string                  - Null terminated input string
+ *              return_value_ptr        - Where the converted value is returned
+ *
+ * RETURN:      Status and 64-bit converted integer
+ *
+ * DESCRIPTION: Performs a base 8 conversion of the input string to an
+ *              integer value, either 32 or 64 bits.
+ *
+ * NOTE:        Maximum 64-bit unsigned octal value is 01777777777777777777777
+ *              Maximum 32-bit unsigned octal value is 037777777777
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_convert_octal_string(char *string, u64 *return_value_ptr)
+{
+	u64 accumulated_value = 0;
+	acpi_status status = AE_OK;
+
+	/* Convert each ASCII byte in the input string */
+
+	while (*string) {
+		/*
+		 * Character must be ASCII 0-7, otherwise:
+		 * 1) Runtime: terminate with no error, per the ACPI spec
+		 * 2) Compiler: return an error
+		 */
+		if (!(ACPI_IS_OCTAL_DIGIT(*string))) {
+#ifdef ACPI_ASL_COMPILER
+			status = AE_BAD_OCTAL_CONSTANT;
+#endif
+			break;
+		}
+
+		/* Convert and insert this octal digit into the accumulator */
+
+		status = acpi_ut_insert_digit(&accumulated_value, 8, *string);
+		if (ACPI_FAILURE(status)) {
+			status = AE_OCTAL_OVERFLOW;
+			break;
+		}
+
+		string++;
+	}
+
+	/* Always return the value that has been accumulated */
+
+	*return_value_ptr = accumulated_value;
+	return (status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_convert_decimal_string
+ *
+ * PARAMETERS:  string                  - Null terminated input string
+ *              return_value_ptr        - Where the converted value is returned
+ *
+ * RETURN:      Status and 64-bit converted integer
+ *
+ * DESCRIPTION: Performs a base 10 conversion of the input string to an
+ *              integer value, either 32 or 64 bits.
+ *
+ * NOTE:        Maximum 64-bit unsigned decimal value is 18446744073709551615
+ *              Maximum 32-bit unsigned decimal value is 4294967295
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_convert_decimal_string(char *string, u64 *return_value_ptr)
+{
+	u64 accumulated_value = 0;
+	acpi_status status = AE_OK;
+
+	/* Convert each ASCII byte in the input string */
+
+	while (*string) {
+		/*
+		 * Character must be ASCII 0-9, otherwise:
+		 * 1) Runtime: terminate with no error, per the ACPI spec
+		 * 2) Compiler: return an error
+		 */
+		if (!isdigit(*string)) {
+#ifdef ACPI_ASL_COMPILER
+			status = AE_BAD_DECIMAL_CONSTANT;
+#endif
+			break;
+		}
+
+		/* Convert and insert this decimal digit into the accumulator */
+
+		status = acpi_ut_insert_digit(&accumulated_value, 10, *string);
+		if (ACPI_FAILURE(status)) {
+			status = AE_DECIMAL_OVERFLOW;
+			break;
+		}
+
+		string++;
+	}
+
+	/* Always return the value that has been accumulated */
+
+	*return_value_ptr = accumulated_value;
+	return (status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_convert_hex_string
+ *
+ * PARAMETERS:  string                  - Null terminated input string
+ *              return_value_ptr        - Where the converted value is returned
+ *
+ * RETURN:      Status and 64-bit converted integer
+ *
+ * DESCRIPTION: Performs a base 16 conversion of the input string to an
+ *              integer value, either 32 or 64 bits.
+ *
+ * NOTE:        Maximum 64-bit unsigned hex value is 0xFFFFFFFFFFFFFFFF
+ *              Maximum 32-bit unsigned hex value is 0xFFFFFFFF
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_convert_hex_string(char *string, u64 *return_value_ptr)
+{
+	u64 accumulated_value = 0;
+	acpi_status status = AE_OK;
+
+	/* Convert each ASCII byte in the input string */
+
+	while (*string) {
+		/*
+		 * Character must be ASCII A-F, a-f, or 0-9, otherwise:
+		 * 1) Runtime: terminate with no error, per the ACPI spec
+		 * 2) Compiler: return an error
+		 */
+		if (!isxdigit(*string)) {
+#ifdef ACPI_ASL_COMPILER
+			status = AE_BAD_HEX_CONSTANT;
+#endif
+			break;
+		}
+
+		/* Convert and insert this hex digit into the accumulator */
+
+		status = acpi_ut_insert_digit(&accumulated_value, 16, *string);
+		if (ACPI_FAILURE(status)) {
+			status = AE_HEX_OVERFLOW;
+			break;
+		}
+
+		string++;
+	}
+
+	/* Always return the value that has been accumulated */
+
+	*return_value_ptr = accumulated_value;
+	return (status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_remove_leading_zeros
+ *
+ * PARAMETERS:  string                  - Pointer to input ASCII string
+ *
+ * RETURN:      Next character after any leading zeros. This character may be
+ *              used by the caller to detect end-of-string.
+ *
+ * DESCRIPTION: Remove any leading zeros in the input string. Return the
+ *              next character after the final ASCII zero to enable the caller
+ *              to check for the end of the string (NULL terminator).
+ *
+ ******************************************************************************/
+
+char acpi_ut_remove_leading_zeros(char **string)
+{
+
+	while (**string == ACPI_ASCII_ZERO) {
+		*string += 1;
+	}
+
+	return (**string);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_remove_whitespace
+ *
+ * PARAMETERS:  string                  - Pointer to input ASCII string
+ *
+ * RETURN:      Next character after any whitespace. This character may be
+ *              used by the caller to detect end-of-string.
+ *
+ * DESCRIPTION: Remove any leading whitespace in the input string. Return the
+ *              next character after the final ASCII zero to enable the caller
+ *              to check for the end of the string (NULL terminator).
+ *
+ ******************************************************************************/
+
+char acpi_ut_remove_whitespace(char **string)
+{
+
+	while (isspace((u8)**string)) {
+		*string += 1;
+	}
+
+	return (**string);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_detect_hex_prefix
+ *
+ * PARAMETERS:  string                  - Pointer to input ASCII string
+ *
+ * RETURN:      TRUE if a "0x" prefix was found at the start of the string
+ *
+ * DESCRIPTION: Detect and remove a hex "0x" prefix
+ *
+ ******************************************************************************/
+
+u8 acpi_ut_detect_hex_prefix(char **string)
+{
+	char *initial_position = *string;
+
+	acpi_ut_remove_hex_prefix(string);
+	if (*string != initial_position) {
+		return (TRUE);	/* String is past leading 0x */
+	}
+
+	return (FALSE);		/* Not a hex string */
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_remove_hex_prefix
+ *
+ * PARAMETERS:  string                  - Pointer to input ASCII string
+ *
+ * RETURN:      none
+ *
+ * DESCRIPTION: Remove a hex "0x" prefix
+ *
+ ******************************************************************************/
+
+void acpi_ut_remove_hex_prefix(char **string)
+{
+	if ((**string == ACPI_ASCII_ZERO) &&
+	    (tolower((int)*(*string + 1)) == 'x')) {
+		*string += 2;	/* Go past the leading 0x */
+	}
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_detect_octal_prefix
+ *
+ * PARAMETERS:  string                  - Pointer to input ASCII string
+ *
+ * RETURN:      True if an octal "0" prefix was found at the start of the
+ *              string
+ *
+ * DESCRIPTION: Detect and remove an octal prefix (zero)
+ *
+ ******************************************************************************/
+
+u8 acpi_ut_detect_octal_prefix(char **string)
+{
+
+	if (**string == ACPI_ASCII_ZERO) {
+		*string += 1;	/* Go past the leading 0 */
+		return (TRUE);
+	}
+
+	return (FALSE);		/* Not an octal string */
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_insert_digit
+ *
+ * PARAMETERS:  accumulated_value       - Current value of the integer value
+ *                                        accumulator. The new value is
+ *                                        returned here.
+ *              base                    - Radix, either 8/10/16
+ *              ascii_digit             - ASCII single digit to be inserted
+ *
+ * RETURN:      Status and result of the convert/insert operation. The only
+ *              possible returned exception code is numeric overflow of
+ *              either the multiply or add conversion operations.
+ *
+ * DESCRIPTION: Generic conversion and insertion function for all bases:
+ *
+ *              1) Multiply the current accumulated/converted value by the
+ *              base in order to make room for the new character.
+ *
+ *              2) Convert the new character to binary and add it to the
+ *              current accumulated value.
+ *
+ *              Note: The only possible exception indicates an integer
+ *              overflow (AE_NUMERIC_OVERFLOW)
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ut_insert_digit(u64 *accumulated_value, u32 base, int ascii_digit)
+{
+	acpi_status status;
+	u64 product;
+
+	/* Make room in the accumulated value for the incoming digit */
+
+	status = acpi_ut_strtoul_multiply64(*accumulated_value, base, &product);
+	if (ACPI_FAILURE(status)) {
+		return (status);
+	}
+
+	/* Add in the new digit, and store the sum to the accumulated value */
+
+	status =
+	    acpi_ut_strtoul_add64(product,
+				  acpi_ut_ascii_char_to_hex(ascii_digit),
+				  accumulated_value);
+
+	return (status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_strtoul_multiply64
+ *
+ * PARAMETERS:  multiplicand            - Current accumulated converted integer
+ *              base                    - Base/Radix
+ *              out_product             - Where the product is returned
+ *
+ * RETURN:      Status and 64-bit product
+ *
+ * DESCRIPTION: Multiply two 64-bit values, with checking for 64-bit overflow as
+ *              well as 32-bit overflow if necessary (if the current global
+ *              integer width is 32).
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ut_strtoul_multiply64(u64 multiplicand, u32 base, u64 *out_product)
+{
+	u64 product;
+	u64 quotient;
+
+	/* Exit if either operand is zero */
+
+	*out_product = 0;
+	if (!multiplicand || !base) {
+		return (AE_OK);
+	}
+
+	/*
+	 * Check for 64-bit overflow before the actual multiplication.
+	 *
+	 * Notes: 64-bit division is often not supported on 32-bit platforms
+	 * (it requires a library function), Therefore ACPICA has a local
+	 * 64-bit divide function. Also, Multiplier is currently only used
+	 * as the radix (8/10/16), to the 64/32 divide will always work.
+	 */
+	acpi_ut_short_divide(ACPI_UINT64_MAX, base, &quotient, NULL);
+	if (multiplicand > quotient) {
+		return (AE_NUMERIC_OVERFLOW);
+	}
+
+	product = multiplicand * base;
+
+	/* Check for 32-bit overflow if necessary */
+
+	if ((acpi_gbl_integer_bit_width == 32) && (product > ACPI_UINT32_MAX)) {
+		return (AE_NUMERIC_OVERFLOW);
+	}
+
+	*out_product = product;
+	return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_strtoul_add64
+ *
+ * PARAMETERS:  addend1                 - Current accumulated converted integer
+ *              digit                   - New hex value/char
+ *              out_sum                 - Where sum is returned (Accumulator)
+ *
+ * RETURN:      Status and 64-bit sum
+ *
+ * DESCRIPTION: Add two 64-bit values, with checking for 64-bit overflow as
+ *              well as 32-bit overflow if necessary (if the current global
+ *              integer width is 32).
+ *
+ ******************************************************************************/
+
+static acpi_status acpi_ut_strtoul_add64(u64 addend1, u32 digit, u64 *out_sum)
+{
+	u64 sum;
+
+	/* Check for 64-bit overflow before the actual addition */
+
+	if ((addend1 > 0) && (digit > (ACPI_UINT64_MAX - addend1))) {
+		return (AE_NUMERIC_OVERFLOW);
+	}
+
+	sum = addend1 + digit;
+
+	/* Check for 32-bit overflow if necessary */
+
+	if ((acpi_gbl_integer_bit_width == 32) && (sum > ACPI_UINT32_MAX)) {
+		return (AE_NUMERIC_OVERFLOW);
+	}
+
+	*out_sum = sum;
+	return (AE_OK);
+}