1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /****************************************************************************** 3 * 4 * Module Name: utuuid -- UUID support functions 5 * 6 * Copyright (C) 2000 - 2020, Intel Corp. 7 * 8 *****************************************************************************/ 9 10 #include <acpi/acpi.h> 11 #include "accommon.h" 12 13 #define _COMPONENT ACPI_COMPILER 14 ACPI_MODULE_NAME("utuuid") 15 16 #if (defined ACPI_ASL_COMPILER || defined ACPI_EXEC_APP || defined ACPI_HELP_APP) 17 /* 18 * UUID support functions. 19 * 20 * This table is used to convert an input UUID ascii string to a 16 byte 21 * buffer and the reverse. The table maps a UUID buffer index 0-15 to 22 * the index within the 36-byte UUID string where the associated 2-byte 23 * hex value can be found. 24 * 25 * 36-byte UUID strings are of the form: 26 * aabbccdd-eeff-gghh-iijj-kkllmmnnoopp 27 * Where aa-pp are one byte hex numbers, made up of two hex digits 28 * 29 * Note: This table is basically the inverse of the string-to-offset table 30 * found in the ACPI spec in the description of the to_UUID macro. 31 */ 32 const u8 acpi_gbl_map_to_uuid_offset[UUID_BUFFER_LENGTH] = { 33 6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 24, 26, 28, 30, 32, 34 34 }; 35 36 /******************************************************************************* 37 * 38 * FUNCTION: acpi_ut_convert_string_to_uuid 39 * 40 * PARAMETERS: in_string - 36-byte formatted UUID string 41 * uuid_buffer - Where the 16-byte UUID buffer is returned 42 * 43 * RETURN: None. Output data is returned in the uuid_buffer 44 * 45 * DESCRIPTION: Convert a 36-byte formatted UUID string to 16-byte UUID buffer 46 * 47 ******************************************************************************/ 48 49 void acpi_ut_convert_string_to_uuid(char *in_string, u8 *uuid_buffer) 50 { 51 u32 i; 52 53 for (i = 0; i < UUID_BUFFER_LENGTH; i++) { 54 uuid_buffer[i] = 55 (acpi_ut_ascii_char_to_hex 56 (in_string[acpi_gbl_map_to_uuid_offset[i]]) << 4); 57 58 uuid_buffer[i] |= 59 acpi_ut_ascii_char_to_hex(in_string 60 [acpi_gbl_map_to_uuid_offset[i] + 61 1]); 62 } 63 } 64 #endif 65