diff options
Diffstat (limited to 'src/VBox/Runtime/r0drv/darwin/spinlock-r0drv-darwin.cpp')
| -rw-r--r-- | src/VBox/Runtime/r0drv/darwin/spinlock-r0drv-darwin.cpp | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r0drv/darwin/spinlock-r0drv-darwin.cpp b/src/VBox/Runtime/r0drv/darwin/spinlock-r0drv-darwin.cpp new file mode 100644 index 00000000..3d7e0fb8 --- /dev/null +++ b/src/VBox/Runtime/r0drv/darwin/spinlock-r0drv-darwin.cpp @@ -0,0 +1,177 @@ +/* $Id: spinlock-r0drv-darwin.cpp $ */ +/** @file + * IPRT - Spinlocks, Ring-0 Driver, Darwin. + */ + +/* + * 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-darwin-kernel.h" +#include "internal/iprt.h" +#include <iprt/spinlock.h> + +#include <iprt/assert.h> +#include <iprt/asm.h> +#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86) +# include <iprt/asm-amd64-x86.h> +#endif +#include <iprt/errcore.h> +#include <iprt/mem.h> +#include <iprt/thread.h> + +#include "internal/magics.h" + + +/********************************************************************************************************************************* +* Structures and Typedefs * +*********************************************************************************************************************************/ +/** + * Wrapper for the KSPIN_LOCK type. + */ +typedef struct RTSPINLOCKINTERNAL +{ + /** Spinlock magic value (RTSPINLOCK_MAGIC). */ + uint32_t volatile u32Magic; + /** Saved interrupt flag. */ + uint32_t volatile fIntSaved; + /** Creation flags. */ + uint32_t fFlags; + /** The Darwin spinlock structure. */ + lck_spin_t *pSpinLock; + /** The spinlock name. */ + const char *pszName; +} 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); + IPRT_DARWIN_SAVE_EFL_AC(); + + /* + * Allocate. + */ + AssertCompile(sizeof(RTSPINLOCKINTERNAL) > sizeof(void *)); + PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)RTMemAlloc(sizeof(*pThis)); + if (pThis) + { + /* + * Initialize & return. + */ + pThis->u32Magic = RTSPINLOCK_MAGIC; + pThis->fIntSaved = 0; + pThis->fFlags = fFlags; + pThis->pszName = pszName; + Assert(g_pDarwinLockGroup); + pThis->pSpinLock = lck_spin_alloc_init(g_pDarwinLockGroup, LCK_ATTR_NULL); + if (pThis->pSpinLock) + { + *pSpinlock = pThis; + IPRT_DARWIN_RESTORE_EFL_AC(); + return VINF_SUCCESS; + } + + RTMemFree(pThis); + } + IPRT_DARWIN_RESTORE_EFL_AC(); + return VERR_NO_MEMORY; +} + + +RTDECL(int) RTSpinlockDestroy(RTSPINLOCK Spinlock) +{ + /* + * Validate input. + */ + 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); + IPRT_DARWIN_SAVE_EFL_AC(); + + Assert(g_pDarwinLockGroup); + lck_spin_free(pThis->pSpinLock, g_pDarwinLockGroup); + pThis->pSpinLock = NULL; + + RTMemFree(pThis); + + IPRT_DARWIN_RESTORE_EFL_AC(); + return VINF_SUCCESS; +} + + +RTDECL(void) RTSpinlockAcquire(RTSPINLOCK Spinlock) +{ + PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock; + AssertPtr(pThis); + Assert(pThis->u32Magic == RTSPINLOCK_MAGIC); + + if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE) + { + uint32_t fIntSaved = ASMGetFlags(); + ASMIntDisable(); + lck_spin_lock(pThis->pSpinLock); + pThis->fIntSaved = fIntSaved; + IPRT_DARWIN_RESTORE_EFL_ONLY_AC_EX(fIntSaved); + } + else + { + IPRT_DARWIN_SAVE_EFL_AC(); + lck_spin_lock(pThis->pSpinLock); + IPRT_DARWIN_RESTORE_EFL_ONLY_AC(); + } +} + + +RTDECL(void) RTSpinlockRelease(RTSPINLOCK Spinlock) +{ + PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock; + AssertPtr(pThis); + Assert(pThis->u32Magic == RTSPINLOCK_MAGIC); + + if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE) + { + uint32_t fIntSaved = pThis->fIntSaved; + pThis->fIntSaved = 0; + lck_spin_unlock(pThis->pSpinLock); + ASMSetFlags(fIntSaved); + } + else + { + IPRT_DARWIN_SAVE_EFL_AC(); + lck_spin_unlock(pThis->pSpinLock); + IPRT_DARWIN_RESTORE_EFL_ONLY_AC(); + } +} + |