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This commit introduces the 'CPU_FEAT_TSCINV' feature bit to indicate
whether or not the CPU supports an invariant TSC.
Signed-off-by: Ian Moffett <ian@osmora.org>
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This commit adds the CPU_UMIP kconf(9) option to allow the user to
configure whether or not the kernel should enable the CR4.UMIP bit.
It is recommended to keep this to "yes" as user applications should
not be able to execute the SGDT, SIDT, SLDT, SMSW or STR instructions
at all for security reasons.
Signed-off-by: Ian Moffett <ian@osmora.org>
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To prevent user programs from performing any operations related to
system memory structures (such as the GDT, TSS, etc), we will always set
CR4.UMIP if possible to improve the security of Hyra.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Some older CPUs may not even support the TSC so it would be a good idea
to check before we start assuming its existence.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Introduce the USER_TSC kernel config option to control whether or not
the 'rdtsc' instruction should be accessible in a user context.
Signed-off-by: Ian Moffett <ian@osmora.org>
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This commit introduces a vendor field within the 'cpu_info' structure.
This allows kernel code to detect the CPU vendor by comparing it with
the CPU_VENDOR_* defines that have also been added.
Signed-off-by: Ian Moffett <ian@osmora.org>
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- Extend 'nswitch' to 64-bits as it increments fast
- Ensure writes to 'nswitch' are atomic
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Sometimes we may rely on a specific kind of timer. While we are able to
grab scheduler specific timers, general purpose timers, etc. One might
need to for example, check whether their general purpose timer timer is
monotonic or not.
Signed-off-by: Ian Moffett <ian@osmora.org>
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This commit greatly improves the handling of how inter-processor
interrupts are allocated and managed. Previously Hyra used handlers at
fixed interrupt vectors for IPIs, however, that is very rigid and not
very scalable at all. With the new IPI framework, one may allocate IPIs
by calling 'md_ipi_alloc()' and initializing the handler field.
To send an IPI to a specific processor, one can use cpu_ipi_send() and
pass the specific CPU structure as well as the IPI identifier.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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A backtrace usually occurs during critcal system events like panics.
When the system in a error state, we cannot trust the correctness of the
stack. This commit aims to improve checks done in a731d4e by adding a
max frame depth that limits how many frames can be walked.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Improve handling within the stacktrace logic used during system panics
and critical events.
- Perform checks on 'rbp' *before* logging
- Ensure RBP is 8-byte aligned
Signed-off-by: Ian Moffett <ian@osmora.org>
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Give each core a bit that indicates whether the core is online or
halted. We also provide a cpu_halt() which marks the core as offline.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Each core on the CPU gets one idle thread so that it is always up to
something. To ensure these threads are not bouncing wildly between cores
and are always ready for their respective processor to take when they
have no threads to grab. We must call proc_pin() on each for every
processor.
Signed-off-by: Ian Moffett <ian@osmora.org>
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It is a good idea to have a completely different stack during syscalls.
This commit implements a TSS IST entry for syscalls.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Certain operations dealing with context switches are better off being
implemented as machine dependent routines which allows us to be flexible
with what we can do, as well as the extra benefit of requiring less
workarounds to keep things MI.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Keep track of how many times an interrupt fires, this can be used for
interrupt statistics later on.
Signed-off-by: Ian Moffett <ian@osmora.org>
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The CPU family ID and model number are sometimes useful in order to
detect the presence of certain CPU features as well as detecting CPU
specific quirks.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Avoid using kprintf() during a system panic event as it relies on
internal locking that may hang the system preventing diagnostics from
being logged
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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To make debugging userland program crashes easier, this commit
introduces coredumps that store the last known process state into a
temporary /tmp/core.X file (where X is the PID of the faulting process).
Signed-off-by: Ian Moffett <ian@osmora.org>
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Allow the user to configure if SMEP would be enabled for their build of
the Hyra AMD64 port
Signed-off-by: Ian Moffett <ian@osmora.org>
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Some CPUs support Supervisor Memory Execution Protection that prevent ring 3
code from being executed in a ring 0 context. Enable this on CPUs that
support it.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Keep track of per-cpu features by using a 'feat' field which contains
the results of various CPUIDs.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Assign a name to each driver through the DRIVER_EXPORT() or
DRIVER_DEFER() macros. This can be used for blacklisting driver
startups.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Introduce a 'board_info' structure as well as an md_get_board() routine
to get information about the host
Signed-off-by: Ian Moffett <ian@osmora.org>
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- Rename regdump() to trap_fatal()
- Use panic() rather than kprintf()
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Having the same amount of idle threads per core allow the CPU to always
have a thread assigned to one of its cores even when there are currently
no other threads for it to take.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Remove logic to reboot machine by simply pressing a key.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Implement logic to update the date returned by the MC1468XX/RTC chip.
This can be used to later implement some sort of time synchronization
protocol or manual setting of the date.
Signed-off-by: Ian Moffett <ian@osmora.org>
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The year register of the RTC does not keep track of the century so
default to 2000 until we figure out the non-standard century register.
Signed-off-by: Ian Moffett <ian@osmora.org>
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On certain embedded controllers (ECs) like the EC present on the
Thinkpad T420s, writes to the i8042 controller configuration byte
are not very liked by the EC internal logic and thus result in them
asserting an NMI as a certain host bus error. To workaround this, Hyra
falls back to polling on these specific devices. Previously, Hyra did not
have DMI/SMBIOS capabilities and therefore had to rely on assuming *all*
Lenovo devices were "hostile". As of now since we are capable grabbing
the product version from DMI, we can target specific devices like the
T420s and this commit provides that logic.
This commit additionally implements logic to enable interrupts on PS/2
port 0 (aka the keyboard).
Signed-off-by: Ian Moffett <ian@osmora.org>
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Before the Hyra kernel starts up, the Limine bootloader creates a
mapping of the first 4 GiB of memory (identity mapped for base revisions
of zero and mapped to the HDDM on higher base revisions). However, it
usually will create a huge mapping over this which would be problematic
during remaps of device MMIO base addresses as they typically reside at
the 4 GiB region of RAM and as of this commit, huge pages are not a
supported feature of the Hyra AMD64 pmap layer.
Signed-off-by: Ian Moffett <ian@osmora.org>
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The function md_td_kick() is only used for user threads and there is no
need reference any kernel segments. Furthermore, the previous code would
introduce a bug where rpl would always be 0.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Allow the intr_hand structure to carry driver specific and interrupt
related data so that it can be passed to an interrupt handler when it
is invoked.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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- Implement pmap_map()
- Implement pmap_unmap()
- Implement pmap_read_vas()
- Implement pmap_switch_vas()
Signed-off-by: Ian Moffett <ian@osmora.org>
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