1 | /* $Id: RTMpGetDescription-generic.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Multiprocessor, Generic RTMpGetDescription.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2009-2022 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | *
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17 | * The contents of this file may alternatively be used under the terms
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18 | * of the Common Development and Distribution License Version 1.0
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19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | * VirtualBox OSE distribution, in which case the provisions of the
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21 | * CDDL are applicable instead of those of the GPL.
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22 | *
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23 | * You may elect to license modified versions of this file under the
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24 | * terms and conditions of either the GPL or the CDDL or both.
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25 | */
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26 |
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27 |
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28 | /*********************************************************************************************************************************
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29 | * Header Files *
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30 | *********************************************************************************************************************************/
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31 | #include <iprt/mp.h>
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32 | #include "internal/iprt.h"
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33 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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34 | # include <iprt/asm-amd64-x86.h>
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35 | #endif
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36 | #include <iprt/err.h>
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37 | #include <iprt/string.h>
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38 |
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39 |
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40 |
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41 | /**
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42 | * Returns "Unknown" as description.
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43 | *
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44 | * @returns VERR_BUFFER_OVERFLOW or VINF_SUCCESS.
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45 | * @param pszBuf Output buffer.
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46 | * @param cbBuf Buffer size.
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47 | */
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48 | static int rtMpGetDescriptionUnknown(char *pszBuf, size_t cbBuf)
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49 | {
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50 | static const char s_szUnknown[] = "Unknown";
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51 | if (cbBuf < sizeof(s_szUnknown))
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52 | return VERR_BUFFER_OVERFLOW;
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53 | memcpy(pszBuf, s_szUnknown, sizeof(s_szUnknown));
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54 | return VINF_SUCCESS;
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55 | }
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56 |
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57 |
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58 | RTDECL(int) RTMpGetDescription(RTCPUID idCpu, char *pszBuf, size_t cbBuf)
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59 | {
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60 | /*
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61 | * Check that the specified cpu is valid & online.
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62 | */
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63 | if (idCpu != NIL_RTCPUID && !RTMpIsCpuOnline(idCpu))
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64 | return RTMpIsCpuPossible(idCpu)
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65 | ? VERR_CPU_OFFLINE
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66 | : VERR_CPU_NOT_FOUND;
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67 |
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68 | /*
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69 | * Construct the description string in a temporary buffer.
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70 | */
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71 | char szString[4*4*3+1];
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72 | RT_ZERO(szString);
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73 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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74 | if (!ASMHasCpuId())
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75 | return rtMpGetDescriptionUnknown(pszBuf, cbBuf);
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76 |
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77 | uint32_t uMax;
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78 | uint32_t uEBX, uECX, uEDX;
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79 | ASMCpuId(0x80000000, &uMax, &uEBX, &uECX, &uEDX);
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80 | if (uMax >= 0x80000002)
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81 | {
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82 | ASMCpuId(0x80000002, &szString[0 + 0], &szString[0 + 4], &szString[0 + 8], &szString[0 + 12]);
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83 | if (uMax >= 0x80000003)
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84 | ASMCpuId(0x80000003, &szString[16 + 0], &szString[16 + 4], &szString[16 + 8], &szString[16 + 12]);
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85 | if (uMax >= 0x80000004)
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86 | ASMCpuId(0x80000004, &szString[32 + 0], &szString[32 + 4], &szString[32 + 8], &szString[32 + 12]);
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87 | }
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88 | else
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89 | {
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90 | ASMCpuId(0x00000000, &uMax, &uEBX, &uECX, &uEDX);
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91 | ((uint32_t *)&szString[0])[0] = uEBX;
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92 | ((uint32_t *)&szString[0])[1] = uEDX;
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93 | ((uint32_t *)&szString[0])[2] = uECX;
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94 | }
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95 |
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96 | #elif defined(RT_ARCH_ARM64)
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97 | RTCCINTREG uFreq;
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98 |
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99 | #else
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100 | # error "PORTME or use RTMpGetDescription-generic-stub.cpp."
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101 | #endif
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102 |
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103 | /*
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104 | * Copy it out into the buffer supplied by the caller.
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105 | */
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106 | char *pszSrc = RTStrStrip(szString);
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107 | size_t cchSrc = strlen(pszSrc);
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108 | if (cchSrc >= cbBuf)
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109 | return VERR_BUFFER_OVERFLOW;
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110 | memcpy(pszBuf, pszSrc, cchSrc + 1);
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111 | return VINF_SUCCESS;
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112 | }
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113 | RT_EXPORT_SYMBOL(RTMpGetDescription);
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114 |
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