1 | /* $Id: spinlock-r0drv-solaris.c 82968 2020-02-04 10:35:17Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Spinlocks, Ring-0 Driver, Solaris.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2020 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 "the-solaris-kernel.h"
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32 | #include "internal/iprt.h"
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33 | #include <iprt/spinlock.h>
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34 |
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35 | #include <iprt/asm.h>
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36 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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37 | # include <iprt/asm-amd64-x86.h>
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38 | #endif
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39 | #include <iprt/assert.h>
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40 | #include <iprt/errcore.h>
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41 | #include <iprt/mem.h>
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42 | #include <iprt/mp.h>
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43 | #include <iprt/thread.h>
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44 | #include "internal/magics.h"
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45 |
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46 |
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47 | /*********************************************************************************************************************************
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48 | * Structures and Typedefs *
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49 | *********************************************************************************************************************************/
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50 | /**
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51 | * Wrapper for the struct mutex type.
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52 | */
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53 | typedef struct RTSPINLOCKINTERNAL
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54 | {
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55 | /** Spinlock magic value (RTSPINLOCK_MAGIC). */
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56 | uint32_t volatile u32Magic;
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57 | /** Spinlock creation flags. */
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58 | uint32_t fFlags;
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59 | /** Saved interrupt flag. */
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60 | uint32_t volatile fIntSaved;
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61 | /** A Solaris spinlock. */
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62 | kmutex_t Mtx;
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63 | #ifdef RT_MORE_STRICT
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64 | /** The idAssertCpu variable before acquring the lock for asserting after
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65 | * releasing the spinlock. */
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66 | RTCPUID volatile idAssertCpu;
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67 | /** The CPU that owns the lock. */
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68 | RTCPUID volatile idCpuOwner;
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69 | #endif
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70 | } RTSPINLOCKINTERNAL, *PRTSPINLOCKINTERNAL;
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71 |
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72 |
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73 |
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74 | RTDECL(int) RTSpinlockCreate(PRTSPINLOCK pSpinlock, uint32_t fFlags, const char *pszName)
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75 | {
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76 | RT_ASSERT_PREEMPTIBLE();
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77 | AssertReturn(fFlags == RTSPINLOCK_FLAGS_INTERRUPT_SAFE || fFlags == RTSPINLOCK_FLAGS_INTERRUPT_UNSAFE, VERR_INVALID_PARAMETER);
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78 |
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79 | /*
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80 | * Allocate.
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81 | */
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82 | AssertCompile(sizeof(RTSPINLOCKINTERNAL) > sizeof(void *));
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83 | PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)RTMemAlloc(sizeof(*pThis));
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84 | if (!pThis)
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85 | return VERR_NO_MEMORY;
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86 |
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87 | /*
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88 | * Initialize & return.
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89 | */
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90 | pThis->u32Magic = RTSPINLOCK_MAGIC;
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91 | pThis->fFlags = fFlags;
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92 | pThis->fIntSaved = 0;
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93 | /** @todo Consider different PIL when not interrupt safe requirement. */
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94 | mutex_init(&pThis->Mtx, "IPRT Spinlock", MUTEX_SPIN, (void *)ipltospl(PIL_MAX));
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95 | *pSpinlock = pThis;
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96 | return VINF_SUCCESS;
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97 | }
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98 |
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99 |
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100 | RTDECL(int) RTSpinlockDestroy(RTSPINLOCK Spinlock)
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101 | {
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102 | /*
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103 | * Validate input.
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104 | */
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105 | RT_ASSERT_INTS_ON();
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106 | PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
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107 | if (!pThis)
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108 | return VERR_INVALID_PARAMETER;
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109 | AssertMsgReturn(pThis->u32Magic == RTSPINLOCK_MAGIC,
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110 | ("Invalid spinlock %p magic=%#x\n", pThis, pThis->u32Magic),
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111 | VERR_INVALID_PARAMETER);
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112 |
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113 | /*
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114 | * Make the lock invalid and release the memory.
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115 | */
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116 | ASMAtomicIncU32(&pThis->u32Magic);
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117 | mutex_destroy(&pThis->Mtx);
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118 | RTMemFree(pThis);
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119 | return VINF_SUCCESS;
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120 | }
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121 |
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122 |
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123 | RTDECL(void) RTSpinlockAcquire(RTSPINLOCK Spinlock)
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124 | {
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125 | PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
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126 | RT_ASSERT_PREEMPT_CPUID_VAR();
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127 | AssertPtr(pThis);
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128 | Assert(pThis->u32Magic == RTSPINLOCK_MAGIC);
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129 |
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130 | if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE)
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131 | {
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132 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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133 | uint32_t fIntSaved = ASMIntDisableFlags();
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134 | #endif
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135 | mutex_enter(&pThis->Mtx);
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136 |
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137 | /*
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138 | * Solaris 10 doesn't preserve the interrupt flag, but since we're at PIL_MAX we should be
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139 | * fine and not get interrupts while lock is held. Re-disable interrupts to not upset
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140 | * assertions & assumptions callers might have.
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141 | */
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142 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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143 | ASMIntDisable();
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144 | #endif
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145 |
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146 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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147 | Assert(!ASMIntAreEnabled());
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148 | #endif
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149 | pThis->fIntSaved = fIntSaved;
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150 | }
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151 | else
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152 | {
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153 | #if defined(RT_STRICT) && (defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86))
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154 | bool fIntsOn = ASMIntAreEnabled();
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155 | #endif
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156 |
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157 | mutex_enter(&pThis->Mtx);
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158 |
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159 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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160 | AssertMsg(fIntsOn == ASMIntAreEnabled(), ("fIntsOn=%RTbool\n", fIntsOn));
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161 | #endif
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162 | }
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163 |
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164 | RT_ASSERT_PREEMPT_CPUID_SPIN_ACQUIRED(pThis);
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165 | }
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166 |
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167 |
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168 | RTDECL(void) RTSpinlockRelease(RTSPINLOCK Spinlock)
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169 | {
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170 | PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
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171 | RT_ASSERT_PREEMPT_CPUID_SPIN_RELEASE_VARS();
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172 |
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173 | AssertPtr(pThis);
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174 | Assert(pThis->u32Magic == RTSPINLOCK_MAGIC);
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175 | RT_ASSERT_PREEMPT_CPUID_SPIN_RELEASE(pThis);
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176 |
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177 | if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE)
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178 | {
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179 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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180 | uint32_t fIntSaved = pThis->fIntSaved;
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181 | pThis->fIntSaved = 0;
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182 | #endif
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183 | mutex_exit(&pThis->Mtx);
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184 |
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185 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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186 | ASMSetFlags(fIntSaved);
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187 | #endif
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188 | }
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189 | else
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190 | {
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191 | #if defined(RT_STRICT) && (defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86))
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192 | bool fIntsOn = ASMIntAreEnabled();
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193 | #endif
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194 |
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195 | mutex_exit(&pThis->Mtx);
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196 |
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197 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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198 | AssertMsg(fIntsOn == ASMIntAreEnabled(), ("fIntsOn=%RTbool\n", fIntsOn));
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199 | #endif
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200 | }
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201 |
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202 | RT_ASSERT_PREEMPT_CPUID();
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203 | }
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204 |
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