MemoryManager cannot use the Singleton class because
MemoryManager::initialize is called before the global constructors
are run. That caused the Singleton to be re-initialized, causing
it to create another MemoryManager instance.
Fixes#3226
Rather than hardcoding where the kmalloc pool should be, place
it at the end of the kernel image instead. This avoids corrupting
global variables or other parts of the kernel as it grows.
Fixes#3257
When trying to scroll up on virtualizers that don't use the VMware
backdoor and instead use PS2MouseDevice, it would actually scroll
down rapidly.
Looking into it, the mouse delta for scrolling down was 1 and 15
for scrolling up. 15 is suspiciously -1 for a nibble.
According to https://isdaman.com/alsos/hardware/mouse/ps2interface.htm
the Z is actually 4 bits for Intellimouse.
This fixes scrolling up on virtualizers such as VirtualBox.
The kernel no longer needs sprintf (which might, in theory, overflow),
so we can hide the C++ declaration and make the function uncallable
from within the kernel.
However, libstdc++ still links against it, as libstdc++ uses it for
demangling, from AK::demangle().
Rather than hardcoding where the kmalloc pool should be, place
it at the end of the kernel image instead. This avoids corrupting
global variables or other parts of the kernel as it grows.
Fixes#3257
MemoryManager cannot use the Singleton class because
MemoryManager::initialize is called before the global constructors
are run. That caused the Singleton to be re-initialized, causing
it to create another MemoryManager instance.
The CMOS sets bit 2 (0x4) if times are binary, if it's not
set they're in BCD.
The CMOS sets bit 1 (0x1) if hours are on a 12 hour clock.
In that case, the highest bit in the hour byte is set for
PM times (both in binary and BCD times).
Three bugs:
1. The lower 7 bits were masked off incorrectly when calling
bcd_to_binary(). Use 0x7F as mask, not 0x70.
2. The highest bit to check if a time was PM was checked after
BCD conversion of the low 7 bits, which clobbered that bit.
Do the check before BCD conversion.
3. In the 12 hour clock, midnight and noon are "12", so those
need to be converted to 0 even if for non-PM times (else
midnight is "12", not "0").
With this, SerenityOS consistently shows UTC as the current time,
as it should.
If folks want it to display local time instead, they can get this
by adding `-rtc base=localtime` to Meta/run.sh -- but a better fix
would be to add timezone management and convert from UTC system
clock to the user timezone at display time.
Previously we were putting strings at the bottom of the allocated stack
region, and pointer arrays (argv, env, auxv) at the top. There was no
reason for this other than "it seemed easier to do it that way at the
time I wrote it."
This patch packs the strings and pointer vectors into the same area at
the top of the stack.
This reduces the memory footprint of all programs by 4 KiB. :^)
This does not add any behaviour change to the processes, but it ties a
TTY to an active process group via TIOCSPGRP, and returns the TTY to the
kernel when all processes in the process group die.
Also makes the TTY keep a link to the original controlling process' parent (for
SIGCHLD) instead of the process itself.
This fixes a bunch of unchecked kernel reads and writes, seems like they
would might exploitable :). Write of sockaddr_in size to any address you
please...
Note that the data member is of type ImmutableBufferArgument, which has
no Userspace<T> usage. I left it alone for now, to be fixed in a future
change holistically for all usages.
Unlike DirectoryEntry (which is used when constructing directories),
DirectoryEntryView does not manage storage for file names. Names are
just StringViews.
This is much more suited to the directory traversal API and makes
it easier to implement this in file system classes since they no
longer need to create temporary name copies while traversing.
