No need to malloc this memory if it's always going to be initialized
anyway. Add history disabling switch to a few targets to make sure both
builds are tested.
Nothing was using console_register_commands so just move the command
block into a read only section. Remove the linked list stuff but add a
block name to print in its place.
Mostly deduplicating x86-32 and x86-64 code since virtually all of it
can be shared.
Fixed up some cpuid usage which was not properly marking registers as
clobber.
Been carrying this flag around for years but from sleuthing around in
the compiler it seems to only exist as the opposite to -fno-inline which
has an actual effect. Only reason -finline would do anything would be to
cancel a previous -fno-inline switch.
From looking at the dissassembly the compiler wasn't doing a good job
with the overly complicated version shared with the larger arm cores.
Simplify it by recognizing that you can save the state directly from
PRIMASK and restore it more simply.
This lets some arches return a 64bit counter.
As a result of fixing this, removed -Wno-format switch in the test app
which caused the need to fix a lot of printfs.
Haven't built for a pre-armv6 or v6 + thumb machine in a long time and
the effort needed to maintain that is not really worth it. Officially
remove the old support code.
Now you need to include arch/atomic.h to get to the atomic routines.
This simplifies a recusion issue in the way arch/ops.h included
arch_ops. Also just generally makes things cleaner.
Easy to do except for the legacy compile case for i386, in which case we
have to start defining fallthrough atomic routines that the compiler
will call.
At the moment only implement __atomic_fetch_add_4 since its the only one
in use.
Previously, was relying on a regular definition with the arch_ops.h code
overriding it with a static inline. This has been annoying for some
years since it forces the declarations to be in order. Change it to
simple declare an inline wrapper around an arch_ routine that does
whatever it needs to do.
Start using PHDRS and MAXPAGESIZE, remove some extraneous stuff.
Possible we can combine a lot of these linker scripts for various arches
if we're careful.
Implements both SV39 and SV48. No 32bit support yet.
Currently implements basic setup of paging in start.S by mapping a large
chunk of memory into both an identity map and to the bottom of the
kernel address space. Run the kernel out of this physical mapping.
Added basic arch mmu support for querying existing paging structures and
mapping 4K pages. No unmap support as of yet.
System boots with mmu on when running supervisor test on qemu. Untested
on real hardware as of yet.
Was always this way for some reason, which would tend to print the
calling routine that called the routine that paniced, which was of
dubious use. Simplify the panic logic and just call it as a standard
varargs routine.
No real change except moving fdt walking code into the fdtwalk library.
Also update some constants for ARM virt and bump the load address to
make sure the FDT works. Turns out it had been missing for a while so it
was actually not finding it because the kernel was loaded too close to
the start of memory.
Only tested with SBI and supervisor mode, but that's all I have now.
Add checked in copies of the device tree needed for a uboot uimage
needed to start it.
Add a define that sets the maximum allowed hart number, potentially
higher than the maximum number of allowed cpus.
This lets us more cleanly deal with having a higher HART number than the
logical cpu numbering. Only really works where it's still fairly packed
around 0, but in the case of the Sifive Unleased board it's just offset
by 1 so it's not a huge loss.
Generally clean up RISCV SMP boot code by rearranging things a bit as
well.
