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ladybird/Kernel
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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
..
ACPI
Kernel: Move Mutex into Locking/
2021-08-07 11:48:00 +02:00
API
Kernel+LibC: Allow clock_gettime() to run without syscalls
2021-08-10 19:21:16 +02:00
Arch
Kernel/SMP: Change critical sections to not disable interrupts
2021-08-10 02:49:37 +02:00
Bus
Kernel/USB: Tighten up USBManagement enumeration code a bit
2021-08-09 22:52:09 +02:00
Devices
Everywhere: Replace AK::Singleton => Singleton
2021-08-08 00:03:45 +02:00
FileSystem
Kernel: Port BlockBasedFileSystem to ProtectedValue :^)
2021-08-08 00:28:10 +02:00
Graphics
Kernel: Remove unused "VGA font" memory region in GraphicsManagement
2021-08-08 14:24:54 +02:00
Heap
Kernel/SMP: Make entering/leaving critical sections multi-processor safe
2021-08-10 02:49:37 +02:00
Interrupts
Everywhere: Replace AK::Singleton => Singleton
2021-08-08 00:03:45 +02:00
Locking
Kernel/SMP: Change critical sections to not disable interrupts
2021-08-10 02:49:37 +02:00
Memory
Kernel: Don't hog MM lock in Memory::Region::clone()
2021-08-09 11:46:31 +02:00
Modules
…
Net
Everywhere: Replace AK::Singleton => Singleton
2021-08-08 00:03:45 +02:00
Prekernel
Meta: Add Clang support to the CMake build scripts
2021-08-08 10:55:36 +02:00
Storage
Kernel: Remove unused mutex PATADiskDevice::m_lock
2021-08-08 00:08:24 +02:00
Syscalls
Kernel+LibC: Allow clock_gettime() to run without syscalls
2021-08-10 19:21:16 +02:00
Tasks
Kernel: Make VirtualFileSystem::sync() static
2021-07-11 00:26:17 +02:00
Time
Kernel+LibC: Allow clock_gettime() to run without syscalls
2021-08-10 19:21:16 +02:00
TTY
Kernel: Fix logic typo in ConsoleManagement::is_initialized()
2021-08-09 11:46:30 +02:00
VirtIO
Kernel: Move SpinLock.h into Locking/
2021-08-07 11:48:00 +02:00
AddressSanitizer.cpp
…
AddressSanitizer.h
…
Assertions.h
AK+Kernel: Print TODO when a TODO() is executed
2021-08-04 11:01:16 +02:00
AtomicEdgeAction.h
Kernel: Add AtomicEdgeAction class
2021-07-07 21:57:01 +02:00
BootInfo.h
Kernel: Support loading the kernel at almost arbitrary virtual addresses
2021-07-27 13:15:16 +02:00
CMakeLists.txt
Kernel/USB: Create controller base class and introduce USBManagement
2021-08-09 21:05:25 +02:00
CMOS.cpp
…
CMOS.h
…
CommandLine.cpp
Kernel/USB: Create controller base class and introduce USBManagement
2021-08-09 21:05:25 +02:00
CommandLine.h
Kernel/USB: Create controller base class and introduce USBManagement
2021-08-09 21:05:25 +02:00
ConsoleDevice.cpp
Everywhere: Replace AK::Singleton => Singleton
2021-08-08 00:03:45 +02:00
ConsoleDevice.h
Kernel: Make various T::class_name() and similar return StringView
2021-07-11 01:46:59 +02:00
CoreDump.cpp
Kernel/SMP: Skip thread registers in core dump if there is no trap frame
2021-08-10 02:49:37 +02:00
CoreDump.h
Kernel: Use Forward.h headers more
2021-07-11 14:14:51 +02:00
Debug.h.in
Kernel: Implement a ISO 9660 filesystem reader :^)
2021-08-07 15:21:58 +02:00
DoubleBuffer.cpp
Kernel: Add convenience values to the Memory::Region::Access enum
2021-08-06 22:25:00 +02:00
DoubleBuffer.h
Kernel: Move Mutex into Locking/
2021-08-07 11:48:00 +02:00
embedmap.sh
Kernel: Make new kernel build process work on macOS
2021-07-15 11:04:30 +02:00
Forward.h
Kernel: Simplify the per-CPU SchedulerData struct
2021-08-08 14:24:54 +02:00
FutexQueue.cpp
Kernel: Fix futex race that could lead to thread waiting forever
2021-07-07 10:05:55 +02:00
FutexQueue.h
Kernel: Move SpinLock.h into Locking/
2021-08-07 11:48:00 +02:00
GlobalProcessExposed.cpp
Kernel: Migrate ARP table locking to ProtectedValue
2021-08-07 11:48:00 +02:00
init.cpp
Kernel/USB: Create controller base class and introduce USBManagement
2021-08-09 21:05:25 +02:00
IO.h
Kernel: Specify I/O size for BMIDEChannel
2021-06-28 15:55:00 +02:00
KBuffer.h
Kernel: Add convenience values to the Memory::Region::Access enum
2021-08-06 22:25:00 +02:00
KBufferBuilder.cpp
Kernel: Add convenience values to the Memory::Region::Access enum
2021-08-06 22:25:00 +02:00
KBufferBuilder.h
Kernel: Remove KBufferBuilder's can_expand restriction
2021-07-20 18:05:05 +02:00
KLexicalPath.cpp
Kernel: Make KLexicalPath::basename() more compliant
2021-07-11 14:10:58 +02:00
KLexicalPath.h
Kernel: Add KLexicalPath::try_join and use it
2021-07-07 15:32:17 +02:00
kprintf.cpp
Kernel: Move SpinLock.h into Locking/
2021-08-07 11:48:00 +02:00
KResult.h
AK+Kernel: Fix perfect forwarding constructors shadowing others
2021-07-08 10:11:00 +02:00
kstdio.h
…
KString.cpp
Kernel: Allow passing null pointer to delete
2021-07-14 13:12:25 +02:00
KString.h
Kernel: Add formatter function for OwnPtr<KString>
2021-07-07 15:32:17 +02:00
KSyms.cpp
Kernel: Print panic backtrace to both the screen and serial
2021-08-04 20:14:54 +02:00
KSyms.h
Kernel: Print panic backtrace to both the screen and serial
2021-08-04 20:14:54 +02:00
linker.ld
Kernel: Support loading the kernel at almost arbitrary virtual addresses
2021-07-27 13:15:16 +02:00
MiniStdLib.cpp
Kernel: Introduce basic pre-kernel environment
2021-07-18 17:31:13 +02:00
mkmap.sh
Kernel: Use our toolchain's c++filt tool for the kernel map
2021-07-29 10:38:31 +02:00
Module.h
…
Multiboot.h
Prekernel: Export some multiboot parameters in our own BootInfo struct
2021-07-27 13:15:16 +02:00
Panic.cpp
Kernel: Print panic backtrace to both the screen and serial
2021-08-04 20:14:54 +02:00
Panic.h
…
PerformanceEventBuffer.cpp
Kernel: Add convenience values to the Memory::Region::Access enum
2021-08-06 22:25:00 +02:00
PerformanceEventBuffer.h
Kernel: Rename PerformanceEvent methods to be more ARCH independent
2021-07-19 08:46:55 +02:00
PerformanceManager.h
Kernel: Rename Range => VirtualRange
2021-08-06 14:05:58 +02:00
PhysicalAddress.h
Kernel: Move PhysicalPage classes out of the heap into an array
2021-07-08 11:43:34 +02:00
Process.cpp
Kernel: Remove unused Process::FileDescriptions::fd_flags()
2021-08-08 14:24:55 +02:00
Process.h
Kernel+LibC: Allow clock_gettime() to run without syscalls
2021-08-10 19:21:16 +02:00
ProcessExposed.cpp
Kernel: Simplify ProcFS generated buffer caching
2021-07-20 18:05:05 +02:00
ProcessExposed.h
Kernel/ProcFS: Make various things superuser-only once again
2021-07-28 18:59:53 +02:00
ProcessGroup.cpp
Everywhere: Replace AK::Singleton => Singleton
2021-08-08 00:03:45 +02:00
ProcessGroup.h
Kernel: Port process groups to SpinLockProtectedValue
2021-08-07 13:30:59 +02:00
ProcessSpecificExposed.cpp
Kernel: Rename Process::space() => Process::address_space()
2021-08-06 14:05:58 +02:00
Random.cpp
Everywhere: Replace AK::Singleton => Singleton
2021-08-08 00:03:45 +02:00
Random.h
Kernel: Move Lockable into its own header
2021-08-07 11:48:00 +02:00
RTC.cpp
Kernel: Ensure we read valid values from the RTC CMOS registers
2021-08-04 19:53:04 +02:00
RTC.h
Kernel: Ensure we read valid values from the RTC CMOS registers
2021-08-04 19:53:04 +02:00
SanCov.cpp
Kernel: Remove unused header includes
2021-08-01 08:10:16 +02:00
Scheduler.cpp
Kernel/SMP: Make entering/leaving critical sections multi-processor safe
2021-08-10 02:49:37 +02:00
Scheduler.h
Kernel: Rename queue_runnable_thread() => enqueue_runnable_thread()
2021-08-08 14:24:55 +02:00
Sections.h
Kernel: Support loading the kernel at almost arbitrary virtual addresses
2021-07-27 13:15:16 +02:00
StdLib.cpp
Kernel: Move Kernel/Memory/ code into Kernel::Memory namespace
2021-08-06 14:05:58 +02:00
StdLib.h
Everywhere: Fix incorrect usages of AK::Checked
2021-07-04 20:08:28 +01:00
Syscall.cpp
Kernel: Rename Process::space() => Process::address_space()
2021-08-06 14:05:58 +02:00
Thread.cpp
Kernel/SMP: Change critical sections to not disable interrupts
2021-08-10 02:49:37 +02:00
Thread.h
Kernel/SMP: Skip thread registers in core dump if there is no trap frame
2021-08-10 02:49:37 +02:00
ThreadBlockers.cpp
Kernel: Make AsyncDeviceRequest::name() return StringView
2021-08-06 00:37:47 +02:00
ThreadTracer.cpp
Kernel: Remove unused header includes in root kernel tree
2021-07-11 21:37:38 +02:00
ThreadTracer.h
Everywhere: Use nothrow new with adopt_{ref,own}_if_nonnull
2021-06-24 17:35:49 +04:30
TimerQueue.cpp
Everywhere: Replace AK::Singleton => Singleton
2021-08-08 00:03:45 +02:00
TimerQueue.h
Kernel: Do not cancel stale timers when servicing sys$alarm
2021-08-03 18:44:01 +02:00
UBSanitizer.cpp
…
UnixTypes.h
LibC+Kernel: Use an enum for clockid_t values
2021-08-10 13:01:39 +02:00
UserOrKernelBuffer.cpp
Kernel: Move Kernel/Memory/ code into Kernel::Memory namespace
2021-08-06 14:05:58 +02:00
UserOrKernelBuffer.h
Kernel: Move Kernel/Memory/ code into Kernel::Memory namespace
2021-08-06 14:05:58 +02:00
VirtualAddress.h
Kernel: Make VirtualAddress::page_base() work with 64-bit addresses
2021-07-18 17:31:13 +02:00
WaitQueue.cpp
…
WaitQueue.h
Kernel: Move SpinLock.h into Locking/
2021-08-07 11:48:00 +02:00
WorkQueue.cpp
Kernel: Move SpinLock.h into Locking/
2021-08-07 11:48:00 +02:00
WorkQueue.h
…