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Since the CPU already does almost all necessary validation steps
for us, we don't really need to attempt to do this. Doing it
ourselves doesn't really work very reliably, because we'd have to
account for other processors modifying virtual memory, and we'd
have to account for e.g. pages not being able to be allocated
due to insufficient resources.
So change the copy_to/from_user (and associated helper functions)
to use the new safe_memcpy, which will return whether it succeeded
or not. The only manual validation step needed (which the CPU
can't perform for us) is making sure the pointers provided by user
mode aren't pointing to kernel mappings.
To make it easier to read/write from/to either kernel or user mode
data add the UserOrKernelBuffer helper class, which will internally
either use copy_from/to_user or directly memcpy, or pass the data
through directly using a temporary buffer on the stack.
Last but not least we need to keep syscall params trivial as we
need to copy them from/to user mode using copy_from/to_user.
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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
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This reverts commit f48feae0b2a300992479abf0b2ded85e45ac6045.
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This reverts commit f0906250a181c831508a45434b9f645ff98f33e4.
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This reverts commit 5a98e329d157a2db8379e0c97c6bdc1328027843.
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Just default the InitFunction template argument.
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Fixes #3226
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This way we can query the kernel to see which keymap is currently in use.
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Instead of returning a ssize_t where negative values mean error,
we now return KResultOr<size_t> and use the error state to report
errors exclusively.
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Add all 6 shortcuts even if the switch between VirtualConsoles is
currently not available in the graphical console.
Also make the case statement more compact.
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Random now gets entropy from the following drivers:
- KeyboardDevice
- PATAChannel
- PS2MouseDevice
- E1000NetworkAdapter
- RTL8139NetworkAdapter
Of these devices, PS2MouseDevice and PATAChannel provide the vast
majority of the entropy.
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Remove character property from event and add code_point property.
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Remove char mapping logic and constant character map.
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This was supposed to be the foundation for some kind of pre-kernel
environment, but nobody is working on it right now, so let's move
everything back into the kernel and remove all the confusion.
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String.h no longer pulls in StringView.h. We do this by moving a bunch
of String functions out-of-line.
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This reverts commit 6c72736b26a81a8f03d8dd47989bfffe26bb1c95.
I am unable to boot on my home machine with this change in the tree.
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System components that need an IRQ handling are now inheriting the
InterruptHandler class.
In addition to that, the initialization process of PATAChannel was
changed to fit the changes.
PATAChannel, E1000NetworkAdapter and RTL8139NetworkAdapter are now
inheriting from PCI::Device instead of InterruptHandler directly.
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As suggested by Joshua, this commit adds the 2-clause BSD license as a
comment block to the top of every source file.
For the first pass, I've just added myself for simplicity. I encourage
everyone to add themselves as copyright holders of any file they've
added or modified in some significant way. If I've added myself in
error somewhere, feel free to replace it with the appropriate copyright
holder instead.
Going forward, all new source files should include a license header.
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This moves it to the kernel's .rodata section which we write protect in
MemoryManager initialization.
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Asking a File if we could possibly read or write it will never mutate
the asking FileDescription&, so it should be const.
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We now support all numpad keys and the Num Lock key.
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Since this key number doesn't appear to collide with anything on the
US keymap, I was thinking we could get away with supporting a hybrid
US/UK keymap. :^)
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These types can be picked up by including <AK/Types.h>:
* u8, u16, u32, u64 (unsigned)
* i8, i16, i32, i64 (signed)
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There's a ton of work that would need to be done before we could spin up on
another architecture, but let's at least try to separate things out a bit.
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After reading a bunch of POSIX specs, I've learned that a file descriptor
is the number that refers to a file description, not the description itself.
So this patch renames FileDescriptor to FileDescription, and Process now has
FileDescription* file_description(int fd).
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This will allow us to implement different behaviors depending on the role
of the descriptor a File is being accessed through.
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I never realized the right shift key wasn't hooked up since my left pinky
always hovers over the left shift key, ready to rock.
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