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serenity/Kernel/Syscalls
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Andreas Kling fdfc66db61 Kernel+LibC: Allow clock_gettime() to run without syscalls 
This patch adds a vDSO-like mechanism for exposing the current time as
an array of per-clock-source timestamps.

LibC's clock_gettime() calls sys$map_time_page() to map the kernel's
"time page" into the process address space (at a random address, ofc.)
This is only done on first call, and from then on the timestamps are
fetched from the time page.

This first patch only adds support for CLOCK_REALTIME, but eventually
we should be able to support all clock sources this way and get rid of
sys$clock_gettime() in the kernel entirely. :^)

Accesses are synchronized using two atomic integers that are incremented
at the start and finish of the kernel's time page update cycle.
2021-08-10 19:21:16 +02:00
..
access.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
alarm.cpp Kernel: Do not cancel stale timers when servicing sys$alarm 2021-08-03 18:44:01 +02:00
anon_create.cpp Kernel: Move Kernel/Memory/ code into Kernel::Memory namespace 2021-08-06 14:05:58 +02:00
beep.cpp Kernel: Disable big process lock for sys$beep() 2021-08-06 23:36:12 +02:00
chdir.cpp Kernel: Remove unused header includes 2021-08-01 08:10:16 +02:00
chmod.cpp Kernel: Remove unused header includes 2021-08-01 08:10:16 +02:00
chown.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
chroot.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
clock.cpp Kernel+LibC: Allow clock_gettime() to run without syscalls 2021-08-10 19:21:16 +02:00
debug.cpp Kernel: Disable big process lock for sys$dbgputch 2021-08-06 23:36:12 +02:00
disown.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
dup2.cpp Kernel: Track allocated FileDescriptionAndFlag elements in each Process 2021-07-28 19:07:00 +02:00
emuctl.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
execve.cpp Kernel/SMP: Change critical sections to not disable interrupts 2021-08-10 02:49:37 +02:00
exit.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
fcntl.cpp Kernel: Track allocated FileDescriptionAndFlag elements in each Process 2021-07-28 19:07:00 +02:00
fork.cpp Kernel: Make Process's m_promises & m_execpromises fields atomic 2021-08-06 23:36:12 +02:00
ftruncate.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
futex.cpp Everywhere: Replace AK::Singleton => Singleton 2021-08-08 00:03:45 +02:00
get_dir_entries.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
get_stack_bounds.cpp Kernel: Disable big process lock for sys$get_stack_bounds 2021-08-06 23:36:12 +02:00
getrandom.cpp Kernel: Disable big process lock for sys$getrandom 2021-08-06 23:36:12 +02:00
getuid.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
hostname.cpp Kernel: Migrate hostname locking to ProtectedValue 2021-08-07 11:48:00 +02:00
inode_watcher.cpp Kernel: Track allocated FileDescriptionAndFlag elements in each Process 2021-07-28 19:07:00 +02:00
ioctl.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
keymap.cpp Kernel: Disable big process lock for sys$getkeymap 2021-08-06 23:36:12 +02:00
kill.cpp Kernel: Migrate process list locking to ProtectedValue 2021-08-07 11:48:00 +02:00
link.cpp Kernel: Use try_copy_kstring_from_user() in sys$link() 2021-08-06 00:37:47 +02:00
lseek.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
mkdir.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
mknod.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
mmap.cpp Kernel: Rename a very long enum to ShouldDeallocateVirtualRange 2021-08-06 21:45:05 +02:00
module.cpp Kernel: Add convenience values to the Memory::Region::Access enum 2021-08-06 22:25:00 +02:00
mount.cpp Kernel: Implement a ISO 9660 filesystem reader :^) 2021-08-07 15:21:58 +02:00
open.cpp Kernel: Remove unused header includes 2021-08-01 08:10:16 +02:00
perf_event.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
pipe.cpp Kernel: Handle OOM from DoubleBuffer creation in FIFO creation 2021-08-03 18:54:23 +02:00
pledge.cpp Kernel: Make Process's m_promises & m_execpromises fields atomic 2021-08-06 23:36:12 +02:00
prctl.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
process.cpp Kernel: Store coredump metadata properties as KStrings 2021-08-06 00:37:47 +02:00
profiling.cpp Kernel: Migrate process list locking to ProtectedValue 2021-08-07 11:48:00 +02:00
ptrace.cpp Kernel: Rename Process::space() => Process::address_space() 2021-08-06 14:05:58 +02:00
purge.cpp Kernel: Move Kernel/Memory/ code into Kernel::Memory namespace 2021-08-06 14:05:58 +02:00
read.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
readlink.cpp Kernel: Remove unused header includes 2021-08-01 08:10:16 +02:00
realpath.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
rename.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
rmdir.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
sched.cpp Kernel: Disable big process lock for sys$yield() 2021-07-20 03:21:14 +02:00
select.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
sendfd.cpp Kernel: Track allocated FileDescriptionAndFlag elements in each Process 2021-07-28 19:07:00 +02:00
setpgid.cpp Kernel: Remove outdated FIXME about ProcessHandle 2021-08-07 12:29:26 +02:00
setuid.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
shutdown.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
sigaction.cpp Kernel: Remove unused header includes 2021-08-01 08:10:16 +02:00
socket.cpp Kernel: Remove unused header includes 2021-08-01 08:10:16 +02:00
stat.cpp Kernel: Remove unused header includes 2021-08-01 08:10:16 +02:00
statvfs.cpp Kernel: Remove unused header includes 2021-08-01 08:10:16 +02:00
sync.cpp Kernel: Disable big process lock for sys$sync 2021-08-07 15:30:26 +02:00
sysconf.cpp Kernel: Disable big process lock for sys$sysconf 2021-08-06 23:36:12 +02:00
thread.cpp Kernel: Rename Process::space() => Process::address_space() 2021-08-06 14:05:58 +02:00
times.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
ttyname.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
umask.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
uname.cpp Kernel: Migrate hostname locking to ProtectedValue 2021-08-07 11:48:00 +02:00
unlink.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
unveil.cpp Kernel: Migrate sys$unveil to use the KString API 2021-07-23 19:02:25 +02:00
utime.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
waitid.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00
write.cpp Kernel: Annotate all syscalls with VERIFY_PROCESS_BIG_LOCK_ACQUIRED 2021-07-20 03:21:14 +02:00