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serenity/Kernel
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Andreas Kling 77cf607cda Kernel+LibC: Publish a "kernel info page" and use it for gettimeofday() 
This patch adds a single "kernel info page" that is mappable read-only
by any process and contains the current time of day.

This is then used to implement a version of gettimeofday() that doesn't
have to make a syscall.

To protect against race condition issues, the info page also has a
serial number which is incremented whenever the kernel updates the
contents of the page. Make sure to verify that the serial number is the
same before and after reading the information you want from the page.
2019-12-15 21:29:26 +01:00
..
Arch/i386 Kernel: Make separate kernel entry points for each PIC IRQ 2019-12-15 12:47:53 +01:00
Devices Kernel: Give PTY's *actually* unique major ID's 2019-12-09 21:03:39 +01:00
FileSystem Kernel+SystemMonitor: Prevent userspace access to process ELF image 2019-12-15 20:11:57 +01:00
Heap Kernel: Demangle userspace ELF symbols in backtraces 2019-11-27 14:06:24 +01:00
Net TCP: Log packet metadata when receiving a TCP packet with no socket 2019-12-14 13:03:26 +01:00
TTY Kernel: Give PTY's *actually* unique major ID's 2019-12-09 21:03:39 +01:00
VM Kernel+SystemMonitor: Prevent userspace access to process ELF image 2019-12-15 20:11:57 +01:00
.bochsrc Meta: Make Serenity run on Bochs once again 2019-08-06 21:09:24 +02:00
.gitignore Meta: Removed all gitignore in the source tree only keeping the root one 2019-06-30 10:41:26 +02:00
Assertions.h Kernel: Move i386.{cpp,h} => Arch/i386/CPU.{cpp,h} 2019-06-07 20:02:01 +02:00
build-gpt-image-grub.sh Build: Fix more bugs in the POSIX sh-ification of scripts 2019-11-03 13:11:43 +01:00
build-image-grub.sh Build: Bump the default disk image size from 500MB to 600MB 2019-11-26 12:54:33 +01:00
build-image-qemu.sh Build: Bump the default disk image size from 500MB to 600MB 2019-11-26 12:54:33 +01:00
build-root-filesystem.sh ProfileViewer: Begin work on a visualization tool for profiles :^) 2019-12-12 22:01:06 +01:00
CMOS.cpp AK: Rename the common integer typedefs to make it obvious what they are. 2019-07-03 21:20:13 +02:00
CMOS.h AK: Rename the common integer typedefs to make it obvious what they are. 2019-07-03 21:20:13 +02:00
Console.cpp Kernel: Make File's can_read/can_write take a const FileDescription& 2019-11-04 14:03:14 +01:00
Console.h Kernel: Make File's can_read/can_write take a const FileDescription& 2019-11-04 14:03:14 +01:00
DoubleBuffer.cpp Revert "Kernel: Make DoubleBuffer use a KBuffer instead of kmalloc()ing" 2019-10-18 15:58:06 +02:00
DoubleBuffer.h Revert "Kernel: Make DoubleBuffer use a KBuffer instead of kmalloc()ing" 2019-10-18 15:58:06 +02:00
FB.h Kernel: Add framebuffer ioctls; wrap raw ioctls with a C API 2019-08-18 07:40:02 +02:00
grub.cfg Kernel: Add serial_debug cmdline parameter 2019-08-11 08:22:42 +02:00
grub_gpt.cfg PartitionTable: Initial GPT Support, Adding Block Limit 2019-10-07 10:11:39 +02:00
init.cpp Kernel: Use a WaitQueue to implement finalizer wakeup 2019-12-01 19:17:17 +01:00
install.sh POSIX compliance: (most) shell scripts converted to generic shell 2019-11-03 09:26:22 +01:00
IO.h Kernel: First cut of a sb16 driver 2019-07-13 08:00:24 +02:00
IRQHandler.cpp Kernel: Move PIC.cpp into Arch/i386/ 2019-07-09 15:04:43 +02:00
IRQHandler.h AK: Rename the common integer typedefs to make it obvious what they are. 2019-07-03 21:20:13 +02:00
KBuffer.h Kernel: Make Region single-owner instead of ref-counted 2019-09-27 14:25:42 +02:00
KBufferBuilder.cpp Kernel: Bump KBufferBuilder VM allocation to 4 MB 2019-12-12 21:58:32 +01:00
KBufferBuilder.h AK: Rename <AK/AKString.h> to <AK/String.h> 2019-09-06 15:36:54 +02:00
KernelInfoPage.h Kernel+LibC: Publish a "kernel info page" and use it for gettimeofday() 2019-12-15 21:29:26 +01:00
KeyCode.h AK: Rename the common integer typedefs to make it obvious what they are. 2019-07-03 21:20:13 +02:00
KParams.cpp AK: Make HashMap::get(Key) return an Optional<Value>. 2019-07-24 10:25:43 +02:00
KParams.h AK: Rename <AK/AKString.h> to <AK/String.h> 2019-09-06 15:36:54 +02:00
kprintf.cpp Kernel: Demangle userspace ELF symbols in backtraces 2019-11-27 14:06:24 +01:00
KResult.h Kernel: Align the KResult value storage appropriately. 2019-08-02 19:22:48 +02:00
kstdio.h Kernel: Demangle userspace ELF symbols in backtraces 2019-11-27 14:06:24 +01:00
KSyms.cpp Kernel: Demangle kernel C++ symbols correctly again 2019-11-29 14:59:15 +01:00
KSyms.h Kernel: Allow modules to link against anything in kernel.map :^) 2019-11-28 21:30:20 +01:00
linker.ld Revert "Kernel: Move Kernel mapping to 0xc0000000" 2019-11-23 17:27:09 +01:00
Lock.cpp Kernel: Use a dedicated thread state for wait-queued threads 2019-12-01 16:02:58 +01:00
Lock.h Kernel: Add a WaitQueue for Thread queueing/waking and use it for Lock 2019-12-01 12:07:43 +01:00
makeall.sh ProfileViewer: Begin work on a visualization tool for profiles :^) 2019-12-12 22:01:06 +01:00
Makefile Kernel: Implement a simple process time profiler 2019-12-11 20:36:56 +01:00
mkmap.sh Kernel: Allow modules to link against anything in kernel.map :^) 2019-11-28 21:30:20 +01:00
Module.h Kernel: Implement basic module unloading :^) 2019-11-28 21:07:22 +01:00
MousePacket.h AK: Rename the common integer typedefs to make it obvious what they are. 2019-07-03 21:20:13 +02:00
Multiboot.h AK: Rename the common integer typedefs to make it obvious what they are. 2019-07-03 21:20:13 +02:00
PCI.cpp Kernel: Hide PCI logs behind a debug flag like other logs 2019-08-14 06:28:53 +02:00
PCI.h Kernel: Add more PCI configuration reading functions 2019-08-14 06:28:53 +02:00
Process.cpp Kernel+LibC: Publish a "kernel info page" and use it for gettimeofday() 2019-12-15 21:29:26 +01:00
Process.h Kernel+LibC: Publish a "kernel info page" and use it for gettimeofday() 2019-12-15 21:29:26 +01:00
ProcessTracer.cpp AK: Rename the common integer typedefs to make it obvious what they are. 2019-07-03 21:20:13 +02:00
ProcessTracer.h Kernel: Make File's can_read/can_write take a const FileDescription& 2019-11-04 14:03:14 +01:00
Profiling.cpp Kernel: Separate out the symbol offsets in profile output 2019-12-12 21:59:47 +01:00
Profiling.h Kernel: Separate out the symbol offsets in profile output 2019-12-12 21:59:47 +01:00
RTC.cpp Kernel: Fix BIOS date/time on hardware 2019-09-28 13:59:49 +02:00
RTC.h Add clang-format file 2019-05-28 17:31:20 +02:00
run run: Unbreak this script when running with a regular Bourne /bin/sh 2019-11-13 21:57:51 +01:00
Scheduler.cpp Kernel+LibC: Publish a "kernel info page" and use it for gettimeofday() 2019-12-15 21:29:26 +01:00
Scheduler.h Kernel: Use a WaitQueue to implement finalizer wakeup 2019-12-01 19:17:17 +01:00
SharedBuffer.cpp Kernel: Teach Region how to remap itself 2019-11-03 21:11:08 +01:00
SharedBuffer.h Kernel+LibC: Make all SharedBuffers purgeable (default: non-volatile) 2019-12-09 20:06:47 +01:00
StdLib.cpp Kernel: Demangle userspace ELF symbols in backtraces 2019-11-27 14:06:24 +01:00
StdLib.h Kernel: Add strncmp() 2019-08-11 16:30:43 +02:00
sync.sh Build: Make sure PATH is passed properly (#765) 2019-11-12 10:26:50 +01:00
Syscall.cpp Kernel: Make separate kernel entry points for each PIC IRQ 2019-12-15 12:47:53 +01:00
Syscall.h Kernel+LibC: Publish a "kernel info page" and use it for gettimeofday() 2019-12-15 21:29:26 +01:00
TestModule.cpp Kernel: Have modules export their name in a "module_name" string 2019-11-29 21:31:17 +01:00
Thread.cpp Kernel: Fix get_register_dump_from_stack() after IRQ entry changes 2019-12-15 17:58:53 +01:00
Thread.h Kernel: Fix get_register_dump_from_stack() after IRQ entry changes 2019-12-15 17:58:53 +01:00
UnixTypes.h Kernel: Start implementing purgeable memory support 2019-12-09 19:12:38 +01:00
WaitQueue.cpp Kernel: Break out of the idle loop on WaitQueue wake instead of on IRQ 2019-12-08 00:33:35 +01:00
WaitQueue.h Kernel: Add a WaitQueue for Thread queueing/waking and use it for Lock 2019-12-01 12:07:43 +01:00