cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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uthex.c (2994B)

      1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
      2/******************************************************************************
      3 *
      4 * Module Name: uthex -- Hex/ASCII 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("uthex")
     15
     16/* Hex to ASCII conversion table */
     17static const char acpi_gbl_hex_to_ascii[] = {
     18	'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
     19	    'E', 'F'
     20};
     21
     22/*******************************************************************************
     23 *
     24 * FUNCTION:    acpi_ut_hex_to_ascii_char
     25 *
     26 * PARAMETERS:  integer             - Contains the hex digit
     27 *              position            - bit position of the digit within the
     28 *                                    integer (multiple of 4)
     29 *
     30 * RETURN:      The converted Ascii character
     31 *
     32 * DESCRIPTION: Convert a hex digit to an Ascii character
     33 *
     34 ******************************************************************************/
     35
     36char acpi_ut_hex_to_ascii_char(u64 integer, u32 position)
     37{
     38	u64 index;
     39
     40	acpi_ut_short_shift_right(integer, position, &index);
     41	return (acpi_gbl_hex_to_ascii[index & 0xF]);
     42}
     43
     44/*******************************************************************************
     45 *
     46 * FUNCTION:    acpi_ut_ascii_to_hex_byte
     47 *
     48 * PARAMETERS:  two_ascii_chars             - Pointer to two ASCII characters
     49 *              return_byte                 - Where converted byte is returned
     50 *
     51 * RETURN:      Status and converted hex byte
     52 *
     53 * DESCRIPTION: Perform ascii-to-hex translation, exactly two ASCII characters
     54 *              to a single converted byte value.
     55 *
     56 ******************************************************************************/
     57
     58acpi_status acpi_ut_ascii_to_hex_byte(char *two_ascii_chars, u8 *return_byte)
     59{
     60
     61	/* Both ASCII characters must be valid hex digits */
     62
     63	if (!isxdigit((int)two_ascii_chars[0]) ||
     64	    !isxdigit((int)two_ascii_chars[1])) {
     65		return (AE_BAD_HEX_CONSTANT);
     66	}
     67
     68	*return_byte =
     69	    acpi_ut_ascii_char_to_hex(two_ascii_chars[1]) |
     70	    (acpi_ut_ascii_char_to_hex(two_ascii_chars[0]) << 4);
     71
     72	return (AE_OK);
     73}
     74
     75/*******************************************************************************
     76 *
     77 * FUNCTION:    acpi_ut_ascii_char_to_hex
     78 *
     79 * PARAMETERS:  hex_char                - Hex character in Ascii. Must be:
     80 *                                        0-9 or A-F or a-f
     81 *
     82 * RETURN:      The binary value of the ascii/hex character
     83 *
     84 * DESCRIPTION: Perform ascii-to-hex translation
     85 *
     86 ******************************************************************************/
     87
     88u8 acpi_ut_ascii_char_to_hex(int hex_char)
     89{
     90
     91	/* Values 0-9 */
     92
     93	if (hex_char <= '9') {
     94		return ((u8)(hex_char - '0'));
     95	}
     96
     97	/* Upper case A-F */
     98
     99	if (hex_char <= 'F') {
    100		return ((u8)(hex_char - 0x37));
    101	}
    102
    103	/* Lower case a-f */
    104
    105	return ((u8)(hex_char - 0x57));
    106}