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/* $Id: spinlock-r0drv-solaris.c $ */
/** @file
* IPRT - Spinlocks, Ring-0 Driver, Solaris.
*/
/*
* Copyright (C) 2006-2020 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "the-solaris-kernel.h"
#include "internal/iprt.h"
#include <iprt/spinlock.h>
#include <iprt/asm.h>
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
# include <iprt/asm-amd64-x86.h>
#endif
#include <iprt/assert.h>
#include <iprt/errcore.h>
#include <iprt/mem.h>
#include <iprt/mp.h>
#include <iprt/thread.h>
#include "internal/magics.h"
/*********************************************************************************************************************************
* Structures and Typedefs *
*********************************************************************************************************************************/
/**
* Wrapper for the struct mutex type.
*/
typedef struct RTSPINLOCKINTERNAL
{
/** Spinlock magic value (RTSPINLOCK_MAGIC). */
uint32_t volatile u32Magic;
/** Spinlock creation flags. */
uint32_t fFlags;
/** Saved interrupt flag. */
uint32_t volatile fIntSaved;
/** A Solaris spinlock. */
kmutex_t Mtx;
#ifdef RT_MORE_STRICT
/** The idAssertCpu variable before acquring the lock for asserting after
* releasing the spinlock. */
RTCPUID volatile idAssertCpu;
/** The CPU that owns the lock. */
RTCPUID volatile idCpuOwner;
#endif
} RTSPINLOCKINTERNAL, *PRTSPINLOCKINTERNAL;
RTDECL(int) RTSpinlockCreate(PRTSPINLOCK pSpinlock, uint32_t fFlags, const char *pszName)
{
RT_ASSERT_PREEMPTIBLE();
AssertReturn(fFlags == RTSPINLOCK_FLAGS_INTERRUPT_SAFE || fFlags == RTSPINLOCK_FLAGS_INTERRUPT_UNSAFE, VERR_INVALID_PARAMETER);
/*
* Allocate.
*/
AssertCompile(sizeof(RTSPINLOCKINTERNAL) > sizeof(void *));
PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)RTMemAlloc(sizeof(*pThis));
if (!pThis)
return VERR_NO_MEMORY;
/*
* Initialize & return.
*/
pThis->u32Magic = RTSPINLOCK_MAGIC;
pThis->fFlags = fFlags;
pThis->fIntSaved = 0;
/** @todo Consider different PIL when not interrupt safe requirement. */
mutex_init(&pThis->Mtx, "IPRT Spinlock", MUTEX_SPIN, (void *)ipltospl(PIL_MAX));
*pSpinlock = pThis;
return VINF_SUCCESS;
}
RTDECL(int) RTSpinlockDestroy(RTSPINLOCK Spinlock)
{
/*
* Validate input.
*/
RT_ASSERT_INTS_ON();
PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
if (!pThis)
return VERR_INVALID_PARAMETER;
AssertMsgReturn(pThis->u32Magic == RTSPINLOCK_MAGIC,
("Invalid spinlock %p magic=%#x\n", pThis, pThis->u32Magic),
VERR_INVALID_PARAMETER);
/*
* Make the lock invalid and release the memory.
*/
ASMAtomicIncU32(&pThis->u32Magic);
mutex_destroy(&pThis->Mtx);
RTMemFree(pThis);
return VINF_SUCCESS;
}
RTDECL(void) RTSpinlockAcquire(RTSPINLOCK Spinlock)
{
PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
RT_ASSERT_PREEMPT_CPUID_VAR();
AssertPtr(pThis);
Assert(pThis->u32Magic == RTSPINLOCK_MAGIC);
if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE)
{
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
uint32_t fIntSaved = ASMIntDisableFlags();
#endif
mutex_enter(&pThis->Mtx);
/*
* Solaris 10 doesn't preserve the interrupt flag, but since we're at PIL_MAX we should be
* fine and not get interrupts while lock is held. Re-disable interrupts to not upset
* assertions & assumptions callers might have.
*/
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
ASMIntDisable();
#endif
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
Assert(!ASMIntAreEnabled());
#endif
pThis->fIntSaved = fIntSaved;
}
else
{
#if defined(RT_STRICT) && (defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86))
bool fIntsOn = ASMIntAreEnabled();
#endif
mutex_enter(&pThis->Mtx);
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
AssertMsg(fIntsOn == ASMIntAreEnabled(), ("fIntsOn=%RTbool\n", fIntsOn));
#endif
}
RT_ASSERT_PREEMPT_CPUID_SPIN_ACQUIRED(pThis);
}
RTDECL(void) RTSpinlockRelease(RTSPINLOCK Spinlock)
{
PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
RT_ASSERT_PREEMPT_CPUID_SPIN_RELEASE_VARS();
AssertPtr(pThis);
Assert(pThis->u32Magic == RTSPINLOCK_MAGIC);
RT_ASSERT_PREEMPT_CPUID_SPIN_RELEASE(pThis);
if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE)
{
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
uint32_t fIntSaved = pThis->fIntSaved;
pThis->fIntSaved = 0;
#endif
mutex_exit(&pThis->Mtx);
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
ASMSetFlags(fIntSaved);
#endif
}
else
{
#if defined(RT_STRICT) && (defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86))
bool fIntsOn = ASMIntAreEnabled();
#endif
mutex_exit(&pThis->Mtx);
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
AssertMsg(fIntsOn == ASMIntAreEnabled(), ("fIntsOn=%RTbool\n", fIntsOn));
#endif
}
RT_ASSERT_PREEMPT_CPUID();
}
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