cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

utuuid.c (3314B)


      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 - 2022, Intel Corp.
      7 *
      8 *****************************************************************************/
      9
     10#include <acpi/acpi.h>
     11#include "accommon.h"
     12
     13#define _COMPONENT          ACPI_COMPILER
     14ACPI_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 */
     32const 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
     49void 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
     65/*******************************************************************************
     66 *
     67 * FUNCTION:    acpi_ut_convert_uuid_to_string
     68 *
     69 * PARAMETERS:  uuid_buffer         - 16-byte UUID buffer
     70 *              out_string          - 36-byte formatted UUID string
     71 *
     72 * RETURN:      Status
     73 *
     74 * DESCRIPTION: Convert 16-byte UUID buffer to 36-byte formatted UUID string
     75 *              out_string must be 37 bytes to include null terminator.
     76 *
     77 ******************************************************************************/
     78
     79acpi_status acpi_ut_convert_uuid_to_string(char *uuid_buffer, char *out_string)
     80{
     81	u32 i;
     82
     83	if (!uuid_buffer || !out_string) {
     84		return (AE_BAD_PARAMETER);
     85	}
     86
     87	for (i = 0; i < UUID_BUFFER_LENGTH; i++) {
     88		out_string[acpi_gbl_map_to_uuid_offset[i]] =
     89		    acpi_ut_hex_to_ascii_char(uuid_buffer[i], 4);
     90
     91		out_string[acpi_gbl_map_to_uuid_offset[i] + 1] =
     92		    acpi_ut_hex_to_ascii_char(uuid_buffer[i], 0);
     93	}
     94
     95	/* Insert required hyphens (dashes) */
     96
     97	out_string[UUID_HYPHEN1_OFFSET] =
     98	    out_string[UUID_HYPHEN2_OFFSET] =
     99	    out_string[UUID_HYPHEN3_OFFSET] =
    100	    out_string[UUID_HYPHEN4_OFFSET] = '-';
    101
    102	out_string[UUID_STRING_LENGTH] = 0;	/* Null terminate */
    103	return (AE_OK);
    104}
    105#endif