1 files changed, 234 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r0drv/linux/thread-r0drv-linux.c b/src/VBox/Runtime/r0drv/linux/thread-r0drv-linux.c
new file mode 100644
index 00000000..c8e0c9d3
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/linux/thread-r0drv-linux.c
@@ -0,0 +1,234 @@
+/* $Id: thread-r0drv-linux.c $ */
+/** @file
+ * IPRT - Threads, Ring-0 Driver, Linux.
+ */
+
+/*
+ * Copyright (C) 2006-2019 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-linux-kernel.h"
+#include "internal/iprt.h"
+#include <iprt/thread.h>
+
+#include <iprt/asm.h>
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 28) || defined(CONFIG_X86_SMAP)
+# include <iprt/asm-amd64-x86.h>
+#endif
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/mp.h>
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+#ifndef CONFIG_PREEMPT
+/** Per-cpu preemption counters. */
+static int32_t volatile g_acPreemptDisabled[NR_CPUS];
+#endif
+
+
+RTDECL(RTNATIVETHREAD) RTThreadNativeSelf(void)
+{
+    return (RTNATIVETHREAD)current;
+}
+RT_EXPORT_SYMBOL(RTThreadNativeSelf);
+
+
+static int rtR0ThreadLnxSleepCommon(RTMSINTERVAL cMillies)
+{
+    IPRT_LINUX_SAVE_EFL_AC();
+    long cJiffies = msecs_to_jiffies(cMillies);
+    set_current_state(TASK_INTERRUPTIBLE);
+    cJiffies = schedule_timeout(cJiffies);
+    IPRT_LINUX_RESTORE_EFL_AC();
+    if (!cJiffies)
+        return VINF_SUCCESS;
+    return VERR_INTERRUPTED;
+}
+
+
+RTDECL(int) RTThreadSleep(RTMSINTERVAL cMillies)
+{
+    return rtR0ThreadLnxSleepCommon(cMillies);
+}
+RT_EXPORT_SYMBOL(RTThreadSleep);
+
+
+RTDECL(int) RTThreadSleepNoLog(RTMSINTERVAL cMillies)
+{
+    return rtR0ThreadLnxSleepCommon(cMillies);
+}
+RT_EXPORT_SYMBOL(RTThreadSleepNoLog);
+
+
+RTDECL(bool) RTThreadYield(void)
+{
+    IPRT_LINUX_SAVE_EFL_AC();
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 20)
+    yield();
+#else
+    /** @todo r=ramshankar: Can we use cond_resched() instead?  */
+    set_current_state(TASK_RUNNING);
+    sys_sched_yield();
+    schedule();
+#endif
+    IPRT_LINUX_RESTORE_EFL_AC();
+    return true;
+}
+RT_EXPORT_SYMBOL(RTThreadYield);
+
+
+RTDECL(bool) RTThreadPreemptIsEnabled(RTTHREAD hThread)
+{
+#ifdef CONFIG_PREEMPT
+    Assert(hThread == NIL_RTTHREAD); RT_NOREF_PV(hThread);
+# ifdef preemptible
+    return preemptible();
+# else
+    return preempt_count() == 0 && !in_atomic() && !irqs_disabled();
+# endif
+#else
+    int32_t c;
+
+    Assert(hThread == NIL_RTTHREAD);
+    c = g_acPreemptDisabled[smp_processor_id()];
+    AssertMsg(c >= 0 && c < 32, ("%d\n", c));
+    if (c != 0)
+        return false;
+# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 32)
+    if (in_atomic())
+        return false;
+# endif
+# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 28)
+    if (irqs_disabled())
+        return false;
+# else
+    if (!ASMIntAreEnabled())
+        return false;
+# endif
+    return true;
+#endif
+}
+RT_EXPORT_SYMBOL(RTThreadPreemptIsEnabled);
+
+
+RTDECL(bool) RTThreadPreemptIsPending(RTTHREAD hThread)
+{
+    Assert(hThread == NIL_RTTHREAD); RT_NOREF_PV(hThread);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 4)
+    return !!test_tsk_thread_flag(current, TIF_NEED_RESCHED);
+
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 20)
+    return !!need_resched();
+
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 1, 110)
+    return current->need_resched != 0;
+
+#else
+    return need_resched != 0;
+#endif
+}
+RT_EXPORT_SYMBOL(RTThreadPreemptIsPending);
+
+
+RTDECL(bool) RTThreadPreemptIsPendingTrusty(void)
+{
+    /* yes, RTThreadPreemptIsPending is reliable. */
+    return true;
+}
+RT_EXPORT_SYMBOL(RTThreadPreemptIsPendingTrusty);
+
+
+RTDECL(bool) RTThreadPreemptIsPossible(void)
+{
+#ifdef CONFIG_PREEMPT
+    return true;    /* Yes, kernel preemption is possible. */
+#else
+    return false;   /* No kernel preemption (or CONFIG_PREEMPT_VOLUNTARY). */
+#endif
+}
+RT_EXPORT_SYMBOL(RTThreadPreemptIsPossible);
+
+
+RTDECL(void) RTThreadPreemptDisable(PRTTHREADPREEMPTSTATE pState)
+{
+#ifdef CONFIG_PREEMPT
+    AssertPtr(pState);
+    Assert(pState->u32Reserved == 0);
+    pState->u32Reserved = 42;
+    /* This ASSUMES that CONFIG_PREEMPT_COUNT is always defined with CONFIG_PREEMPT. */
+    preempt_disable();
+    RT_ASSERT_PREEMPT_CPUID_DISABLE(pState);
+
+#else /* !CONFIG_PREEMPT */
+    int32_t c;
+    AssertPtr(pState);
+    Assert(pState->u32Reserved == 0);
+
+    /* Do our own accounting. */
+    c = ASMAtomicIncS32(&g_acPreemptDisabled[smp_processor_id()]);
+    AssertMsg(c > 0 && c < 32, ("%d\n", c));
+    pState->u32Reserved = c;
+    RT_ASSERT_PREEMPT_CPUID_DISABLE(pState);
+#endif
+}
+RT_EXPORT_SYMBOL(RTThreadPreemptDisable);
+
+
+RTDECL(void) RTThreadPreemptRestore(PRTTHREADPREEMPTSTATE pState)
+{
+#ifdef CONFIG_PREEMPT
+    IPRT_LINUX_SAVE_EFL_AC(); /* paranoia */
+    AssertPtr(pState);
+    Assert(pState->u32Reserved == 42);
+    RT_ASSERT_PREEMPT_CPUID_RESTORE(pState);
+    preempt_enable();
+    IPRT_LINUX_RESTORE_EFL_ONLY_AC();  /* paranoia */
+
+#else
+    int32_t volatile *pc;
+    AssertPtr(pState);
+    AssertMsg(pState->u32Reserved > 0 && pState->u32Reserved < 32, ("%d\n", pState->u32Reserved));
+    RT_ASSERT_PREEMPT_CPUID_RESTORE(pState);
+
+    /* Do our own accounting. */
+    pc = &g_acPreemptDisabled[smp_processor_id()];
+    AssertMsg(pState->u32Reserved == (uint32_t)*pc, ("u32Reserved=%d *pc=%d \n", pState->u32Reserved, *pc));
+    ASMAtomicUoWriteS32(pc, pState->u32Reserved - 1);
+#endif
+    pState->u32Reserved = 0;
+}
+RT_EXPORT_SYMBOL(RTThreadPreemptRestore);
+
+
+RTDECL(bool) RTThreadIsInInterrupt(RTTHREAD hThread)
+{
+    Assert(hThread == NIL_RTTHREAD); NOREF(hThread);
+
+    return in_interrupt() != 0;
+}
+RT_EXPORT_SYMBOL(RTThreadIsInInterrupt);
+