I just copy-pasted microseconds_since_boot and
set_interrupt_interval_usec from aarch64.
However, on RISC-V, they are not in microseconds.
The TimerRegisters struct is also unused.
current_time and set_compare can also be private and static.
IRQHandler is not the correct class to inherit from, as the timer
is not connected to an IRQController.
Each hart has one of these Timers directly connected to it.
I originally added this header because I misunderstood how
IRQControllers are supposed to be used.
I thought that I would need a IRQController class for the hart-local
interrupt controller, but apparently, this class is supposed to be used
for non-local interrupt controllers like the IOAPIC or RISC-V PLIC.
x86 LAPICs don't use this class either.
I am not sure why 096cecb95e disabled the stack protector and sanitizers
for all files, but this is not necessary.
Only the pre_init code needs to run without them, as that code runs
identity mapped.
We initialize the MMU by first setting up the page tables for the
kernel image and the initial kernel stack.
Then we jump to a identity mapped page which makes the newly created
kernel root page table active by setting `satp` and then jumps to
`init`.
This trap handler uses the SBI to print an error message via a newly
introduced panic function, which is necessary as `pre_init` is running
identity mapped.
Also add a header file for `pre_init.cpp` as we wan't to use the panic
and `dbgln` function in the MMU init code as well.
We first try to use the newer "SRST" extension for rebooting and
shutting down and if that fails, we try to shutdown using the legacy
"System Shutdown" extension (which can't reboot, so we always shutdown).
The kernel will halt, if we return from here due to all attempts at
rebooting / shutting down failing.
This scan code set is more advanced than the basic scan code set 1, and
is required to be supported for some bare metal hardware that might not
properly enable the PS2 first port translation in the i8042 controller.
LibWeb can now also generate bindings for keyboard events like the Pause
key, as well as other function keys (such as Right Alt, etc).
The logic for handling scan code sets is implemented by the PS2 keyboard
driver and is abstracted from the main HID KeyboardDevice code which
only handles "standard" KeyEvent(s).
This scan code set is more advanced than the basic scan code set 1, and
is required to be supported for some bare metal hardware that might not
properly enable the PS2 first port translation in the i8042 controller.
LibWeb can now also generate bindings for keyboard events like the Pause
key, as well as other function keys (such as Right Alt, etc).
The logic for handling scan code sets is implemented by the PS2 keyboard
driver and is abstracted from the main HID KeyboardDevice code which
only handles "standard" KeyEvent(s).
The signal handling code (and possibly other code as well) expects this
struct to have an alignment of 16 bytes, as it pushes this struct on the
stack.
This commit adds all necessary includes, so all functions are properly
declared.
PCI.cpp is moved to PCI/Initializer.cpp, as that matches the header
path.
`MM.protect_kernel_image` would otherwise make the contents of these
sections read-only, as they were for some reason placed before `.data`
and after the start of `.text`.
Other arches don't use the prekernel, so don't try to unmap it on
non-x86 platforms.
For some reason, this didn't cause aarch64 to crash, but on riscv64 this
would cause a panic.
There's no need to have separate syscall for this kind of functionality,
as we can just have a device node in /dev, called "beep", that allows
writing tone generation packets to emulate the same behavior.
In addition to that, we remove LibC sysbeep function, as this function
was never being used by any C program nor it was standardized in any
way.
Instead, we move the userspace implementation to LibCore.
Moving the DeviceManagement initialization, which is only needed by
userland in the first place, to after interrupt and time management
initialization (like other things that require randomness) allows the
SipHash initialization to access good randomness without problems.
Note: There currently is another, unrelated boot problem on aarch64,
which is not caused by SipHash as far as we know. This commit therefore
only fixes the SipHash regression.
According to multiboot spec if flag for framebuffer isn't
set then corresponding fields are invalid. In reality they're set
to 0 but let's be defensive.
About half of the Processor code is common across architectures, so
let's share it with a templated base class. Also, other code that can be
shared in some ways, like FPUState and TrapFrame functions, is adjusted
here. Functions which cannot be shared trivially (without internal
refactoring) are left alone for now.
This subtraction is necessary to ensure that the section has the correct
address. Also, without this change, the Kernel ELF binary would explode
in size. This was forgotten in a0dd6ec6b1.
