1 | /* $Id: asm-fake.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Fake asm.h routines for use early in a new port.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2010-2023 Oracle and/or its affiliates.
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8 | *
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9 | * This file is part of VirtualBox base platform packages, as
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10 | * available from https://www.virtualbox.org.
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11 | *
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12 | * This program is free software; you can redistribute it and/or
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13 | * modify it under the terms of the GNU General Public License
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14 | * as published by the Free Software Foundation, in version 3 of the
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15 | * License.
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16 | *
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17 | * This program is distributed in the hope that it will be useful, but
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18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 | * General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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24 | *
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25 | * The contents of this file may alternatively be used under the terms
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26 | * of the Common Development and Distribution License Version 1.0
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27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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28 | * in the VirtualBox distribution, in which case the provisions of the
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29 | * CDDL are applicable instead of those of the GPL.
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30 | *
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31 | * You may elect to license modified versions of this file under the
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32 | * terms and conditions of either the GPL or the CDDL or both.
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33 | *
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34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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35 | */
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36 |
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37 |
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38 | /*********************************************************************************************************************************
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39 | * Header Files *
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40 | *********************************************************************************************************************************/
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41 | #include <iprt/asm.h>
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42 | #include "internal/iprt.h"
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43 |
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44 | #include <iprt/string.h>
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45 | #include <iprt/param.h>
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46 |
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47 |
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48 | RTDECL(uint8_t) ASMAtomicXchgU8(volatile uint8_t *pu8, uint8_t u8)
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49 | {
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50 | uint8_t u8Ret = *pu8;
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51 | *pu8 = u8;
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52 | return u8Ret;
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53 | }
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54 |
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55 | RTDECL(uint16_t) ASMAtomicXchgU16(volatile uint16_t *pu16, uint16_t u16)
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56 | {
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57 | uint16_t u16Ret = *pu16;
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58 | *pu16 = u16;
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59 | return u16Ret;
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60 | }
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61 |
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62 | RTDECL(uint32_t) ASMAtomicXchgU32(volatile uint32_t *pu32, uint32_t u32)
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63 | {
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64 | uint32_t u32Ret = *pu32;
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65 | *pu32 = u32;
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66 | return u32Ret;
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67 | }
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68 |
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69 | RTDECL(uint64_t) ASMAtomicXchgU64(volatile uint64_t *pu64, uint64_t u64)
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70 | {
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71 | uint64_t u64Ret = *pu64;
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72 | *pu64 = u64;
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73 | return u64Ret;
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74 | }
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75 |
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76 | RTDECL(bool) ASMAtomicCmpXchgU8(volatile uint8_t *pu8, const uint8_t u8New, const uint8_t u8Old)
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77 | {
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78 | if (*pu8 == u8Old)
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79 | {
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80 | *pu8 = u8New;
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81 | return true;
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82 | }
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83 | return false;
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84 | }
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85 |
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86 | RTDECL(bool) ASMAtomicCmpXchgU32(volatile uint32_t *pu32, const uint32_t u32New, const uint32_t u32Old)
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87 | {
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88 | if (*pu32 == u32Old)
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89 | {
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90 | *pu32 = u32New;
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91 | return true;
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92 | }
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93 | return false;
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94 | }
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95 |
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96 | RTDECL(bool) ASMAtomicCmpXchgU64(volatile uint64_t *pu64, const uint64_t u64New, const uint64_t u64Old)
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97 | {
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98 | if (*pu64 == u64Old)
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99 | {
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100 | *pu64 = u64New;
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101 | return true;
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102 | }
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103 | return false;
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104 | }
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105 |
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106 | RTDECL(bool) ASMAtomicCmpXchgExU32(volatile uint32_t *pu32, const uint32_t u32New, const uint32_t u32Old, uint32_t *pu32Old)
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107 | {
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108 | uint32_t u32Cur = *pu32;
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109 | if (u32Cur == u32Old)
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110 | {
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111 | *pu32 = u32New;
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112 | *pu32Old = u32Old;
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113 | return true;
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114 | }
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115 | *pu32Old = u32Cur;
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116 | return false;
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117 | }
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118 |
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119 | RTDECL(bool) ASMAtomicCmpXchgExU64(volatile uint64_t *pu64, const uint64_t u64New, const uint64_t u64Old, uint64_t *pu64Old)
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120 | {
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121 | uint64_t u64Cur = *pu64;
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122 | if (u64Cur == u64Old)
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123 | {
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124 | *pu64 = u64New;
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125 | *pu64Old = u64Old;
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126 | return true;
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127 | }
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128 | *pu64Old = u64Cur;
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129 | return false;
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130 | }
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131 |
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132 | RTDECL(uint32_t) ASMAtomicAddU32(uint32_t volatile *pu32, uint32_t u32)
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133 | {
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134 | uint32_t u32Old = *pu32;
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135 | *pu32 = u32Old + u32;
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136 | return u32Old;
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137 | }
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138 |
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139 | RTDECL(uint64_t) ASMAtomicAddU64(uint64_t volatile *pu64, uint64_t u64)
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140 | {
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141 | uint64_t u64Old = *pu64;
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142 | *pu64 = u64Old + u64;
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143 | return u64Old;
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144 | }
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145 |
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146 | RTDECL(uint32_t) ASMAtomicIncU32(uint32_t volatile *pu32)
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147 | {
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148 | return *pu32 += 1;
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149 | }
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150 |
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151 | RTDECL(uint32_t) ASMAtomicUoIncU32(uint32_t volatile *pu32)
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152 | {
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153 | return *pu32 += 1;
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154 | }
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155 |
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156 | RTDECL(uint32_t) ASMAtomicDecU32(uint32_t volatile *pu32)
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157 | {
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158 | return *pu32 -= 1;
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159 | }
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160 |
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161 | RTDECL(uint32_t) ASMAtomicUoDecU32(uint32_t volatile *pu32)
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162 | {
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163 | return *pu32 -= 1;
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164 | }
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165 |
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166 | RTDECL(uint64_t) ASMAtomicIncU64(uint64_t volatile *pu64)
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167 | {
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168 | return *pu64 += 1;
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169 | }
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170 |
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171 | RTDECL(uint64_t) ASMAtomicDecU64(uint64_t volatile *pu64)
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172 | {
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173 | return *pu64 -= 1;
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174 | }
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175 |
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176 | RTDECL(void) ASMAtomicOrU32(uint32_t volatile *pu32, uint32_t u32)
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177 | {
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178 | *pu32 |= u32;
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179 | }
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180 |
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181 | RTDECL(void) ASMAtomicUoOrU32(uint32_t volatile *pu32, uint32_t u32)
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182 | {
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183 | *pu32 |= u32;
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184 | }
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185 |
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186 | RTDECL(void) ASMAtomicAndU32(uint32_t volatile *pu32, uint32_t u32)
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187 | {
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188 | *pu32 &= u32;
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189 | }
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190 |
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191 | RTDECL(void) ASMAtomicUoAndU32(uint32_t volatile *pu32, uint32_t u32)
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192 | {
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193 | *pu32 &= u32;
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194 | }
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195 |
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196 | RTDECL(void) ASMAtomicOrU64(uint64_t volatile *pu64, uint64_t u64)
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197 | {
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198 | *pu64 |= u64;
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199 | }
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200 |
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201 | RTDECL(void) ASMAtomicAndU64(uint64_t volatile *pu64, uint64_t u64)
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202 | {
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203 | *pu64 &= u64;
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204 | }
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205 |
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206 | RTDECL(void) ASMSerializeInstruction(void)
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207 | {
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208 |
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209 | }
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210 |
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211 | RTDECL(uint64_t) ASMAtomicReadU64(volatile uint64_t *pu64)
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212 | {
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213 | return *pu64;
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214 | }
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215 |
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216 | RTDECL(uint64_t) ASMAtomicUoReadU64(volatile uint64_t *pu64)
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217 | {
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218 | return *pu64;
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219 | }
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220 |
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221 | RTDECL(uint8_t) ASMProbeReadByte(const void *pvByte)
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222 | {
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223 | return *(volatile uint8_t *)pvByte;
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224 | }
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225 |
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226 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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227 | RTDECL(void) ASMNopPause(void)
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228 | {
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229 | }
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230 | #endif
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231 |
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232 | RTDECL(void) ASMBitSet(volatile void *pvBitmap, int32_t iBit)
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233 | {
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234 | uint8_t volatile *pau8Bitmap = (uint8_t volatile *)pvBitmap;
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235 | pau8Bitmap[iBit / 8] |= (uint8_t)RT_BIT_32(iBit & 7);
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236 | }
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237 |
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238 | RTDECL(void) ASMAtomicBitSet(volatile void *pvBitmap, int32_t iBit)
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239 | {
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240 | ASMBitSet(pvBitmap, iBit);
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241 | }
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242 |
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243 | RTDECL(void) ASMBitClear(volatile void *pvBitmap, int32_t iBit)
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244 | {
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245 | uint8_t volatile *pau8Bitmap = (uint8_t volatile *)pvBitmap;
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246 | pau8Bitmap[iBit / 8] &= ~((uint8_t)RT_BIT_32(iBit & 7));
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247 | }
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248 |
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249 | RTDECL(void) ASMAtomicBitClear(volatile void *pvBitmap, int32_t iBit)
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250 | {
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251 | ASMBitClear(pvBitmap, iBit);
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252 | }
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253 |
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254 | RTDECL(void) ASMBitToggle(volatile void *pvBitmap, int32_t iBit)
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255 | {
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256 | uint8_t volatile *pau8Bitmap = (uint8_t volatile *)pvBitmap;
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257 | pau8Bitmap[iBit / 8] ^= (uint8_t)RT_BIT_32(iBit & 7);
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258 | }
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259 |
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260 | RTDECL(void) ASMAtomicBitToggle(volatile void *pvBitmap, int32_t iBit)
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261 | {
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262 | ASMBitToggle(pvBitmap, iBit);
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263 | }
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264 |
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265 | RTDECL(bool) ASMBitTestAndSet(volatile void *pvBitmap, int32_t iBit)
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266 | {
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267 | if (ASMBitTest(pvBitmap, iBit))
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268 | return true;
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269 | ASMBitSet(pvBitmap, iBit);
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270 | return false;
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271 | }
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272 |
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273 | RTDECL(bool) ASMAtomicBitTestAndSet(volatile void *pvBitmap, int32_t iBit)
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274 | {
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275 | return ASMBitTestAndSet(pvBitmap, iBit);
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276 | }
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277 |
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278 | RTDECL(bool) ASMBitTestAndClear(volatile void *pvBitmap, int32_t iBit)
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279 | {
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280 | if (!ASMBitTest(pvBitmap, iBit))
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281 | return false;
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282 | ASMBitClear(pvBitmap, iBit);
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283 | return true;
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284 | }
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285 |
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286 | RTDECL(bool) ASMAtomicBitTestAndClear(volatile void *pvBitmap, int32_t iBit)
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287 | {
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288 | return ASMBitTestAndClear(pvBitmap, iBit);
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289 | }
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290 |
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291 | RTDECL(bool) ASMBitTestAndToggle(volatile void *pvBitmap, int32_t iBit)
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292 | {
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293 | bool fRet = ASMBitTest(pvBitmap, iBit);
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294 | ASMBitToggle(pvBitmap, iBit);
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295 | return fRet;
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296 | }
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297 |
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298 | RTDECL(bool) ASMAtomicBitTestAndToggle(volatile void *pvBitmap, int32_t iBit)
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299 | {
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300 | return ASMBitTestAndToggle(pvBitmap, iBit);
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301 | }
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302 |
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303 | RTDECL(bool) ASMBitTest(const volatile void *pvBitmap, int32_t iBit)
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304 | {
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305 | uint8_t volatile *pau8Bitmap = (uint8_t volatile *)pvBitmap;
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306 | return pau8Bitmap[iBit / 8] & (uint8_t)RT_BIT_32(iBit & 7) ? true : false;
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307 | }
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308 |
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309 | RTDECL(unsigned) ASMBitFirstSetU32(uint32_t u32)
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310 | {
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311 | uint32_t iBit;
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312 | for (iBit = 0; iBit < 32; iBit++)
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313 | if (u32 & RT_BIT_32(iBit))
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314 | return iBit + 1;
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315 | return 0;
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316 | }
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317 |
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318 | RTDECL(unsigned) ASMBitLastSetU32(uint32_t u32)
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319 | {
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320 | uint32_t iBit = 32;
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321 | while (iBit-- > 0)
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322 | if (u32 & RT_BIT_32(iBit))
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323 | return iBit + 1;
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324 | return 0;
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325 | }
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326 |
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327 | RTDECL(unsigned) ASMBitFirstSetU64(uint64_t u64)
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328 | {
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329 | uint32_t iBit;
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330 | for (iBit = 0; iBit < 64; iBit++)
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331 | if (u64 & RT_BIT_64(iBit))
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332 | return iBit + 1;
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333 | return 0;
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334 | }
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335 |
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336 | RTDECL(unsigned) ASMBitLastSetU64(uint64_t u64)
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337 | {
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338 | uint32_t iBit = 64;
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339 | while (iBit-- > 0)
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340 | if (u64 & RT_BIT_64(iBit))
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341 | return iBit + 1;
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342 | return 0;
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343 | }
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344 |
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345 | RTDECL(uint16_t) ASMByteSwapU16(uint16_t u16)
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346 | {
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347 | return RT_MAKE_U16(RT_HIBYTE(u16), RT_LOBYTE(u16));
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348 | }
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349 |
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350 | RTDECL(uint32_t) ASMByteSwapU32(uint32_t u32)
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351 | {
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352 | return RT_MAKE_U32_FROM_U8(RT_BYTE4(u32), RT_BYTE3(u32), RT_BYTE2(u32), RT_BYTE1(u32));
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353 | }
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354 |
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