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We were not allocating enough memory due to using u32 instead of
FlatPtr for each AP's stack pointer.
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The AP boot code was partially adapted to build on x86_64 but didn't
properly jump into 64 bit mode. Furthermore, the APIC code was still
using 32 bit pointers.
Fixes #12662
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When we implement MSI support, we can rely on the IRQHandler class for
installing IRQ handlers at the right location.
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As make<T> is infallible, it really should not be used anywhere in the
Kernel. Instead replace with fallible `new (nothrow)` calls, that will
eventually be error-propagated.
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There is no use in calling disable_irq function in the IRQHandler
constructor if irq was not registered before. So add a condition where
we call disable_irq only if the irq was registered before.
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Even if the PIC was disabled it can still generate noise (spurious IRQs)
so we need to register two handlers for handling such cases.
Also, we declare interrupt service routine offset 0x20 to 0x2f as
reserved, so when the PIC is disabled, we can handle spurious IRQs from
the PIC at separate handlers.
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...and deal with the fallout by adding missing includes everywhere.
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This mostly just moved the problem, as a lot of the callers are not
capable of propagating the errors themselves, but it's a step in the
right direction.
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In preparation for making Vector::empend unavailable during
compilation of the Kernel.
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Fixes #11402.
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Currently the APIC class is constructed irrespective of whether it
is used or not.
So, move APIC initialization from init to the InterruptManagement
class and construct the APIC class only when it is needed.
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Found by PVS Studio Static Analysis
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Now that the shared bottom 2 MiB virtual address mappings are gone
userspace can use lower virtual addresses.
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Since this range is mapped in already in the kernel page directory, we
can initialize it before jumping into the first kernel process which
lets us avoid mapping in the range into init_stage2's address space.
This brings us half-way to removing the shared bottom 2 MiB mapping in
every process, leaving only the Prekernel.
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We need to use the IOAPIC in SMP mode, so if the user requested to
disable it, we can't enable SMP mode either.
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This small change allows to use the IOAPIC by default without to enable
SMP mode, which emulates Uni-Processor setup with IOAPIC instead of
using the PIC.
This opens the opportunity to utilize other types of interrupts like MSI
and MSI-X interrupts.
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The MADT data could be on unaligned boundary - for example, a GSI number
(u32) on unaligned address which leads to a KUBSAN error and halting the
system.
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This makes searching for not yet OOM safe interfaces a bit easier.
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We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace!
This was a slightly tedious refactoring that took a long time, so it's
not unlikely that some bugs crept in.
Nevertheless, it does pass basic functionality testing, and it's just
real nice to finally see the same pattern in all contexts. :^)
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A new RegisterState header includes the platform specific RegisterState
header based on the platform being compiled.
The Aarch64 RegisterState header contains stubs for Debug
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Previously there was a mix of returning plain strings and returning
explicit string views using `operator ""sv`. This change switches them
all to standardized on `operator ""sv` as it avoids a call to strlen.
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This will somwhat help unify them also under the same SysFS directory in
the commit.
Also, it feels much more like this change reflects the reality that both
ACPI and the BIOS are part of the firmware on x86 computers.
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This makes the user-facing type only take the node member pointer, and
lets the compiler figure out the other needed types from that.
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This is a better pattern than returning a PhysicalAddress with a zero
value, so the code is more understandable now.
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This expands the reach of error propagation greatly throughout the
kernel. Sadly, it also exposes the fact that we're allocating (and
doing other fallible things) in constructors all over the place.
This patch doesn't attempt to address that of course. That's work for
our future selves.
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This allows addressing all cores on more modern processors. For now,
we still have a hardcoded limit of 64 due to s_processors being a
static array.
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...to is_owned_by_current_processor(). As Tom pointed out, this is
much more accurate. :^)
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Rename these API's to make it more clear what they are checking.
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And let id() be the non-static version that gives you the ID of a
Processor object.
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This makes for nicer handling of errors compared to checking whether a
RefPtr is null. Additionally, this will give way to return different
types of errors in the future.
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Instead of `Memory::Region::Access::Read | Memory::Region::AccessWrite`
you can now say `Memory::Region::Access::ReadWrite`.
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ShouldDeallocateVirtualMemoryVirtualRange was a bit on the long side.
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When booting AP's, we identity map a region at 0x8000 while doing the
initial bringup sequence. This is the only thing in the kernel that
requires an identity mapping, yet we had a bunch of generic API's and a
dedicated VirtualRangeAllocator in every PageDirectory for this purpose.
This patch simplifies the situation by moving the identity mapping logic
to the AP boot code and removing the generic API's.
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This directory isn't just about virtual memory, it's about all kinds
of memory management.
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Instead of returning char const*, we can also give you a StringView.
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When retrieving and setting x86 MSRs two registers are required. The
existing setter and getter for the MSR class made this implementation
detail visible to the caller. This changes the setter and getter to
use u64 instead.
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The `#pragma GCC diagnostic` part is needed because the class has
virtual methods with the same name but different arguments, and Clang
tries to warn us that we are not actually overriding anything with
these.
Weirdly enough, GCC does not seem to care.
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This also removes a lot of CPU.h includes infavor for Sections.h
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