Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 196 insertions, 0 deletions

diff --git a/src/VBox/Runtime/r0drv/linux/time-r0drv-linux.c b/src/VBox/Runtime/r0drv/linux/time-r0drv-linux.c
new file mode 100644
index 00000000..399f6998
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/linux/time-r0drv-linux.c
@@ -0,0 +1,196 @@
+/* $Id: time-r0drv-linux.c $ */
+/** @file
+ * IPRT - Time, 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                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_TIME
+#include "the-linux-kernel.h"
+#include "internal/iprt.h"
+#include <iprt/time.h>
+#include <iprt/asm.h>
+
+
+
+DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
+{
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 16) /* This must match timer-r0drv-linux.c! */
+    /*
+     * Use ktime_get_ts, this is also what clock_gettime(CLOCK_MONOTONIC,) is using.
+     */
+    uint64_t u64;
+    struct timespec Ts;
+    ktime_get_ts(&Ts);
+    u64 = Ts.tv_sec * RT_NS_1SEC_64 + Ts.tv_nsec;
+    return u64;
+
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 60)
+    /*
+     * Seems there is no way of getting to the exact source of
+     * sys_clock_gettime(CLOCK_MONOTONIC, &ts) here, I think. But
+     * 64-bit jiffies adjusted for the initial value should be pretty
+     * much the same I hope.
+     */
+    uint64_t u64 = get_jiffies_64();
+# ifdef INITIAL_JIFFIES
+    u64 += INITIAL_JIFFIES;
+# endif
+    u64 *= TICK_NSEC;
+    return u64;
+
+#else   /* < 2.5.60 */
+# if BITS_PER_LONG >= 64
+    /*
+     * This is the same as above, except that there is no get_jiffies_64()
+     * here and we rely on long, and therefor jiffies, being 64-bit instead.
+     */
+    uint64_t u64 = jiffies;
+# ifdef INITIAL_JIFFIES
+    u64 += INITIAL_JIFFIES;
+# endif
+    u64 *= TICK_NSEC;
+    return u64;
+
+# else /* 32 bit jiffies */
+    /*
+     * We'll have to try track jiffy rollovers here or we'll be
+     * in trouble every time it flips.
+     *
+     * The high dword of the s_u64Last is the rollover count, the
+     * low dword is the previous jiffies.  Updating is done by
+     * atomic compare & exchange of course.
+     */
+    static uint64_t volatile s_u64Last = 0;
+    uint64_t u64;
+
+    for (;;)
+    {
+        uint64_t u64NewLast;
+        int32_t iDelta;
+        uint32_t cRollovers;
+        uint32_t u32LastJiffies;
+
+        /* sample the values */
+        unsigned long ulNow = jiffies;
+        uint64_t u64Last = s_u64Last;
+        if (ulNow != jiffies)
+            continue; /* try again */
+#  ifdef INITIAL_JIFFIES
+        ulNow += INITIAL_JIFFIES;
+#  endif
+
+        u32LastJiffies = (uint32_t)u64Last;
+        cRollovers = u64Last >> 32;
+
+        /*
+         * Check for rollover and update the static last value.
+         *
+         * We have to make sure we update it successfully to rule out
+         * an underrun because of racing someone.
+         */
+        iDelta = ulNow - u32LastJiffies;
+        if (iDelta < 0)
+        {
+            cRollovers++;
+            u64NewLast = RT_MAKE_U64(ulNow, cRollovers);
+            if (!ASMAtomicCmpXchgU64(&s_u64Last, u64NewLast, u64Last))
+                continue; /* race, try again */
+        }
+        else
+        {
+            u64NewLast = RT_MAKE_U64(ulNow, cRollovers);
+            ASMAtomicCmpXchgU64(&s_u64Last, u64NewLast, u64Last);
+        }
+
+        /* calculate the return value */
+        u64 = ulNow;
+        u64 *= TICK_NSEC;
+        u64 += cRollovers * (_4G * TICK_NSEC);
+        break;
+    }
+
+    return u64;
+# endif /* 32 bit jiffies */
+#endif  /* < 2.5.60 */
+}
+
+
+RTDECL(uint64_t) RTTimeNanoTS(void)
+{
+    return rtTimeGetSystemNanoTS();
+}
+RT_EXPORT_SYMBOL(RTTimeNanoTS);
+
+
+RTDECL(uint64_t) RTTimeMilliTS(void)
+{
+    return rtTimeGetSystemNanoTS() / RT_NS_1MS;
+}
+RT_EXPORT_SYMBOL(RTTimeMilliTS);
+
+
+RTDECL(uint64_t) RTTimeSystemNanoTS(void)
+{
+    return rtTimeGetSystemNanoTS();
+}
+RT_EXPORT_SYMBOL(RTTimeSystemNanoTS);
+
+
+RTDECL(uint64_t) RTTimeSystemMilliTS(void)
+{
+    return rtTimeGetSystemNanoTS() / RT_NS_1MS;
+}
+RT_EXPORT_SYMBOL(RTTimeSystemMilliTS);
+
+
+RTDECL(PRTTIMESPEC) RTTimeNow(PRTTIMESPEC pTime)
+{
+    IPRT_LINUX_SAVE_EFL_AC();
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 16)
+/* On Linux 4.20, time.h includes time64.h and we have to use 64-bit times. */
+# ifdef _LINUX_TIME64_H
+    struct timespec64 Ts;
+    ktime_get_real_ts64(&Ts);
+# else
+    struct timespec Ts;
+    ktime_get_real_ts(&Ts);
+# endif
+    IPRT_LINUX_RESTORE_EFL_AC();
+# ifdef _LINUX_TIME64_H
+    return RTTimeSpecSetTimespec64(pTime, &Ts);
+#else
+    return RTTimeSpecSetTimespec(pTime, &Ts);
+#endif
+#else   /* < 2.6.16 */
+    struct timeval Tv;
+    do_gettimeofday(&Tv);
+    IPRT_LINUX_RESTORE_EFL_AC();
+    return RTTimeSpecSetTimeval(pTime, &Tv);
+#endif
+}
+RT_EXPORT_SYMBOL(RTTimeNow);
+