This has KString, KBuffer, DoubleBuffer, KBufferBuilder, IOWindow,
UserOrKernelBuffer and ScopedCritical classes being moved to the
Kernel/Library subdirectory.
Also, move the panic and assertions handling code to that directory.
MSI(x) interrupts need to reserve IRQs so that it can be programmed by
the device. Add an API to reserve contiguous ranges of interrupt
handlers so that it can used by PCI devices that use MSI(x) mechanism.
This API needs to be implemented by aarch64 architecture.
is_sharing_with_others API was never really put to use properly since
it was introduced. The only place where it is used in Interrupts.cpp is
in conjuction with is_shared_handler() which is only true for
SharedIRQHandler and is_sharing_with_others will always return false.
Remove that API.
If IRQHandler's IRQ is shared, then disable_irq() should not call the
controller to disable that IRQ as some other device might be using it.
IRQHandler had a private variable to indicate if it is being shared:
m_shared_with_others but it was never modified even if the IRQ was
shared.
Add a new member function set_shared_with_others() to enable/disable
m_shared_with_others member of IRQHandler class. This function is
called when an IRQHandler is being added/removed as a part of
SharedIRQHandler.
The class used to look at the x86_64 specific exception code to figure
out what kind of page fault happend, however this refactor allows
aarch64 to use the same class.
A lot of interrupt numbers are initialized with the unhandled interrupt
handler. Whenever a new handler is registered on one of these
interrupts, the old handler is unregistered first. Let's not be verbose
about this since it is perfectly normal.
If a page fault occurs while interrupts are disabled, we were wrongly
enabling interrupts right away in the page fault handler.
Instead, we should only do this if interrupts were enabled when the
page fault occurred.
