1 | /* $Id: asm-fake.cpp 29278 2010-05-09 23:28:27Z 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 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/asm.h>
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32 | #include "internal/iprt.h"
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33 |
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34 | #include <iprt/string.h>
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35 | #include <iprt/param.h>
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36 |
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37 |
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38 | RTDECL(uint8_t) ASMAtomicXchgU8(volatile uint8_t *pu8, uint8_t u8)
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39 | {
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40 | uint8_t u8Ret = *pu8;
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41 | *pu8 = u8;
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42 | return u8Ret;
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43 | }
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44 |
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45 | RTDECL(uint16_t) ASMAtomicXchgU16(volatile uint16_t *pu16, uint16_t u16)
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46 | {
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47 | uint16_t u16Ret = *pu16;
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48 | *pu16 = u16;
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49 | return u16Ret;
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50 | }
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51 |
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52 | RTDECL(uint32_t) ASMAtomicXchgU32(volatile uint32_t *pu32, uint32_t u32)
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53 | {
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54 | uint32_t u32Ret = *pu32;
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55 | *pu32 = u32;
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56 | return u32Ret;
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57 | }
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58 |
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59 | RTDECL(uint64_t) ASMAtomicXchgU64(volatile uint64_t *pu64, uint64_t u64)
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60 | {
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61 | uint64_t u64Ret = *pu64;
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62 | *pu64 = u64;
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63 | return u64Ret;
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64 | }
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65 |
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66 | RTDECL(bool) ASMAtomicCmpXchgU8(volatile uint8_t *pu8, const uint8_t u8New, const uint8_t u8Old)
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67 | {
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68 | if (*pu8 == u8Old)
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69 | {
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70 | *pu8 = u8New;
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71 | return true;
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72 | }
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73 | return false;
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74 | }
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75 |
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76 | RTDECL(bool) ASMAtomicCmpXchgU32(volatile uint32_t *pu32, const uint32_t u32New, const uint32_t u32Old)
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77 | {
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78 | if (*pu32 == u32Old)
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79 | {
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80 | *pu32 = u32New;
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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) ASMAtomicCmpXchgU64(volatile uint64_t *pu64, const uint64_t u64New, const uint64_t u64Old)
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87 | {
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88 | if (*pu64 == u64Old)
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89 | {
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90 | *pu64 = u64New;
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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) ASMAtomicCmpXchgExU32(volatile uint32_t *pu32, const uint32_t u32New, const uint32_t u32Old, uint32_t *pu32Old)
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97 | {
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98 | uint32_t u32Cur = *pu32;
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99 | if (u32Cur == u32Old)
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100 | {
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101 | *pu32 = u32New;
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102 | *pu32Old = u32Old;
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103 | return true;
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104 | }
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105 | *pu32Old = u32Cur;
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106 | return false;
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107 | }
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108 |
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109 | RTDECL(bool) ASMAtomicCmpXchgExU64(volatile uint64_t *pu64, const uint64_t u64New, const uint64_t u64Old, uint64_t *pu64Old)
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110 | {
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111 | uint64_t u64Cur = *pu64;
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112 | if (u64Cur == u64Old)
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113 | {
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114 | *pu64 = u64New;
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115 | *pu64Old = u64Old;
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116 | return true;
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117 | }
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118 | *pu64Old = u64Cur;
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119 | return false;
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120 | }
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121 |
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122 | RTDECL(uint32_t) ASMAtomicAddU32(uint32_t volatile *pu32, uint32_t u32)
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123 | {
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124 | uint32_t u32Old = *pu32;
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125 | *pu32 = u32Old + u32;
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126 | return u32Old;
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127 | }
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128 |
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129 | RTDECL(uint32_t) ASMAtomicIncU32(uint32_t volatile *pu32)
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130 | {
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131 | return *pu32 += 1;
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132 | }
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133 |
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134 | RTDECL(uint32_t) ASMAtomicDecU32(uint32_t volatile *pu32)
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135 | {
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136 | return *pu32 -= 1;
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137 | }
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138 |
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139 | RTDECL(void) ASMAtomicOrU32(uint32_t volatile *pu32, uint32_t u32)
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140 | {
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141 | *pu32 |= u32;
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142 | }
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143 |
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144 | RTDECL(void) ASMAtomicAndU32(uint32_t volatile *pu32, uint32_t u32)
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145 | {
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146 | *pu32 &= u32;
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147 | }
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148 |
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149 | RTDECL(void) ASMSerializeInstruction(void)
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150 | {
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151 |
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152 | }
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153 |
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154 | RTDECL(uint64_t) ASMAtomicReadU64(volatile uint64_t *pu64)
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155 | {
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156 | return *pu64;
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157 | }
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158 |
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159 | RTDECL(uint64_t) ASMAtomicUoReadU64(volatile uint64_t *pu64)
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160 | {
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161 | return *pu64;
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162 | }
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163 |
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164 | RTDECL(void) ASMMemZeroPage(volatile void *pv)
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165 | {
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166 | uintptr_t volatile *puPtr = (uintptr_t volatile *)pv;
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167 | uint32_t cbLeft = PAGE_SIZE / sizeof(uintptr_t);
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168 | while (cbLeft-- > 0)
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169 | *puPtr++ = 0;
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170 | }
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171 |
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172 | RTDECL(void) ASMMemZero32(volatile void *pv, size_t cb)
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173 | {
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174 | uint32_t volatile *pu32 = (uint32_t volatile *)pv;
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175 | uint32_t cbLeft = cb / sizeof(uint32_t);
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176 | while (cbLeft-- > 0)
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177 | *pu32++ = 0;
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178 | }
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179 |
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180 | RTDECL(void) ASMMemFill32(volatile void *pv, size_t cb, uint32_t u32)
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181 | {
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182 | uint32_t volatile *pu32 = (uint32_t volatile *)pv;
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183 | while (cb > 0)
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184 | {
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185 | *pu32 = u32;
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186 | cb -= sizeof(uint32_t);
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187 | pu32++;
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188 | }
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189 | }
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190 |
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191 | RTDECL(uint8_t) ASMProbeReadByte(const void *pvByte)
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192 | {
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193 | return *(volatile uint8_t *)pvByte;
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194 | }
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195 |
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196 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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197 | RTDECL(void) ASMNopPause(void)
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198 | {
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199 | }
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200 | #endif
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201 |
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202 | RTDECL(void) ASMBitSet(volatile void *pvBitmap, int32_t iBit)
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203 | {
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204 | uint32_t volatile *pau32Bitmap = (uint32_t volatile *)pvBitmap;
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205 | pau32Bitmap[iBit / 32] |= RT_BIT_32(iBit & 31);
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206 | }
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207 |
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208 | RTDECL(void) ASMAtomicBitSet(volatile void *pvBitmap, int32_t iBit)
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209 | {
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210 | ASMBitSet(pvBitmap, iBit);
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211 | }
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212 |
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213 | RTDECL(void) ASMBitClear(volatile void *pvBitmap, int32_t iBit)
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214 | {
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215 | uint32_t volatile *pau32Bitmap = (uint32_t volatile *)pvBitmap;
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216 | pau32Bitmap[iBit / 32] &= ~RT_BIT_32(iBit & 31);
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217 | }
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218 |
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219 | RTDECL(void) ASMAtomicBitClear(volatile void *pvBitmap, int32_t iBit)
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220 | {
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221 | ASMBitClear(pvBitmap, iBit);
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222 | }
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223 |
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224 | RTDECL(void) ASMBitToggle(volatile void *pvBitmap, int32_t iBit)
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225 | {
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226 | uint32_t volatile *pau32Bitmap = (uint32_t volatile *)pvBitmap;
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227 | pau32Bitmap[iBit / 32] ^= RT_BIT_32(iBit & 31);
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228 | }
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229 |
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230 | RTDECL(void) ASMAtomicBitToggle(volatile void *pvBitmap, int32_t iBit)
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231 | {
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232 | ASMBitToggle(pvBitmap, iBit);
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233 | }
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234 |
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235 | RTDECL(bool) ASMBitTestAndSet(volatile void *pvBitmap, int32_t iBit)
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236 | {
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237 | if (ASMBitTest(pvBitmap, iBit))
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238 | return true;
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239 | ASMBitSet(pvBitmap, iBit);
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240 | return false;
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241 | }
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242 |
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243 | RTDECL(bool) ASMAtomicBitTestAndSet(volatile void *pvBitmap, int32_t iBit)
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244 | {
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245 | return ASMBitTestAndSet(pvBitmap, iBit);
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246 | }
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247 |
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248 | RTDECL(bool) ASMBitTestAndClear(volatile void *pvBitmap, int32_t iBit)
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249 | {
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250 | if (!ASMBitTest(pvBitmap, iBit))
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251 | return false;
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252 | ASMBitClear(pvBitmap, iBit);
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253 | return true;
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254 | }
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255 |
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256 | RTDECL(bool) ASMAtomicBitTestAndClear(volatile void *pvBitmap, int32_t iBit)
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257 | {
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258 | return ASMBitTestAndClear(pvBitmap, iBit);
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259 | }
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260 |
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261 | RTDECL(bool) ASMBitTestAndToggle(volatile void *pvBitmap, int32_t iBit)
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262 | {
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263 | bool fRet = ASMBitTest(pvBitmap, iBit);
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264 | ASMBitToggle(pvBitmap, iBit);
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265 | return fRet;
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266 | }
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267 |
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268 | RTDECL(bool) ASMAtomicBitTestAndToggle(volatile void *pvBitmap, int32_t iBit)
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269 | {
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270 | return ASMBitTestAndToggle(pvBitmap, iBit);
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271 | }
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272 |
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273 | RTDECL(bool) ASMBitTest(const volatile void *pvBitmap, int32_t iBit)
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274 | {
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275 | uint32_t volatile *pau32Bitmap = (uint32_t volatile *)pvBitmap;
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276 | return pau32Bitmap[iBit / 32] & RT_BIT_32(iBit & 31) ? true : false;
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277 | }
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278 |
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279 | RTDECL(int) ASMBitFirstClear(const volatile void *pvBitmap, uint32_t cBits)
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280 | {
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281 | uint32_t iBit = 0;
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282 | uint32_t volatile *pu32 = (uint32_t volatile *)pvBitmap;
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283 | while (iBit < cBits)
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284 | {
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285 | uint32_t u32 = *pu32;
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286 | if (u32 != UINT32_MAX)
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287 | {
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288 | while (u32 & 1)
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289 | {
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290 | u32 >>= 1;
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291 | iBit++;
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292 | }
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293 | if (iBit >= cBits)
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294 | return -1;
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295 | return iBit;
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296 | }
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297 |
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298 | iBit += 32;
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299 | pu32++;
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300 | }
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301 | return -1;
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302 | }
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303 |
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304 | RTDECL(int) ASMBitNextClear(const volatile void *pvBitmap, uint32_t cBits, uint32_t iBitPrev)
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305 | {
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306 | const volatile uint32_t *pau32Bitmap = (const volatile uint32_t *)pvBitmap;
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307 | int iBit = ++iBitPrev & 31;
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308 | if (iBit)
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309 | {
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310 | /*
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311 | * Inspect the 32-bit word containing the unaligned bit.
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312 | */
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313 | uint32_t u32 = ~pau32Bitmap[iBitPrev / 32] >> iBit;
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314 | if (u32)
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315 | {
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316 | iBit = 0;
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317 | while (!(u32 & 1))
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318 | {
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319 | u32 >>= 1;
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320 | iBit++;
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321 | }
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322 | return iBitPrev + iBit;
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323 | }
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324 |
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325 | /*
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326 | * Skip ahead and see if there is anything left to search.
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327 | */
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328 | iBitPrev |= 31;
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329 | iBitPrev++;
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330 | if (cBits <= (uint32_t)iBitPrev)
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331 | return -1;
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332 | }
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333 |
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334 | /*
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335 | * 32-bit aligned search, let ASMBitFirstClear do the dirty work.
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336 | */
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337 | iBit = ASMBitFirstClear(&pau32Bitmap[iBitPrev / 32], cBits - iBitPrev);
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338 | if (iBit >= 0)
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339 | iBit += iBitPrev;
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340 | return iBit;
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341 | }
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342 |
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343 | RTDECL(int) ASMBitFirstSet(const volatile void *pvBitmap, uint32_t cBits)
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344 | {
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345 | uint32_t iBit = 0;
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346 | uint32_t volatile *pu32 = (uint32_t volatile *)pvBitmap;
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347 | while (iBit < cBits)
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348 | {
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349 | uint32_t u32 = *pu32;
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350 | if (u32 != 0)
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351 | {
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352 | while (!(u32 & 1))
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353 | {
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354 | u32 >>= 1;
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355 | iBit++;
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356 | }
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357 | if (iBit >= cBits)
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358 | return -1;
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359 | return iBit;
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360 | }
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361 |
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362 | iBit += 32;
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363 | pu32++;
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364 | }
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365 | return -1;
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366 | }
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367 |
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368 | RTDECL(int) ASMBitNextSet(const volatile void *pvBitmap, uint32_t cBits, uint32_t iBitPrev)
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369 | {
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370 | const volatile uint32_t *pau32Bitmap = (const volatile uint32_t *)pvBitmap;
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371 | int iBit = ++iBitPrev & 31;
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372 | if (iBit)
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373 | {
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374 | /*
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375 | * Inspect the 32-bit word containing the unaligned bit.
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376 | */
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377 | uint32_t u32 = pau32Bitmap[iBitPrev / 32] >> iBit;
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378 | if (u32)
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379 | {
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380 | iBit = 0;
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381 | while (!(u32 & 1))
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382 | {
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383 | u32 >>= 1;
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384 | iBit++;
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385 | }
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386 | return iBitPrev + iBit;
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387 | }
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388 |
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389 | /*
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390 | * Skip ahead and see if there is anything left to search.
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391 | */
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392 | iBitPrev |= 31;
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393 | iBitPrev++;
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394 | if (cBits <= (uint32_t)iBitPrev)
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395 | return -1;
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396 | }
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397 |
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398 | /*
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399 | * 32-bit aligned search, let ASMBitFirstSet do the dirty work.
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400 | */
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401 | iBit = ASMBitFirstSet(&pau32Bitmap[iBitPrev / 32], cBits - iBitPrev);
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402 | if (iBit >= 0)
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403 | iBit += iBitPrev;
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404 | return iBit;
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405 | }
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406 |
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407 | RTDECL(unsigned) ASMBitFirstSetU32(uint32_t u32)
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408 | {
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409 | uint32_t iBit;
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410 | for (iBit = 0; iBit < 32; iBit++)
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411 | if (u32 & RT_BIT_32(iBit))
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412 | return iBit + 1;
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413 | return 0;
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414 | }
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415 |
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416 | RTDECL(unsigned) ASMBitLastSetU32(uint32_t u32)
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417 | {
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418 | int32_t iBit = 32;
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419 | while (iBit-- > 0)
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420 | if (u32 & RT_BIT_32(iBit))
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421 | return iBit + 1;
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422 | return 0;
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423 | }
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424 |
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425 | RTDECL(uint16_t) ASMByteSwapU16(uint16_t u16)
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426 | {
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427 | return RT_MAKE_U16(RT_HIBYTE(u16), RT_LOBYTE(u16));
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428 | }
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429 |
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430 | RTDECL(uint32_t) ASMByteSwapU32(uint32_t u32)
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431 | {
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432 | return RT_MAKE_U32_FROM_U8(RT_BYTE4(u32), RT_BYTE3(u32), RT_BYTE2(u32), RT_BYTE1(u32));
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433 | }
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434 |
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