- Move a bit of the shared logic of secondary bootstrapping into a new
function, lk_secondary_cpu_entry_early() which sets the current cpu
pointer before calling the first half of the secondary LK_INIT
routines.
- Create the per cpu idle threads on the main cpu instead of the
secondary as they come up.
- Tweak all of the SMP capable architectures to use this new path.
- Move the top level mp routines into a separate file top/mp.c
- A bit more correctly ifdef out more SMP code.
- Make the secondary entry point be logically separate function, though
declared in the same file.
- Add a trick where the kernel base + 4 is the secondary entry point.
Not really useful except makes it easy to compute the offset
elsewhere.
- Changed the entry point to arm64_reset and move _start to the linker
script, which is what most other arches do.
- While was in the linker script, make sure the text segment is aligned
on MAXPAGESIZE, though doesn't make any real difference currently.
- Generally clean up the assembly in start.S with newer macros from
Fuchsia, and avoid using ldr X, =value as much as possible.
- Fix and make sure arm64 can build and run with WITH_SMP set to false.
Add a new no-smp project to test this.
Note this will likely break systems where all of the cpus enter the
kernel simultaneously, which we can fix if that becomes an issue.
Secondary code now completely assumes the cpu number is passed in x0.
This can be emulated with platform specific trampoline code if it needs
to that then just directs into the the secondary entry point, instead of
trying to make the arch code have to deal with all cases.
- Add a percpu structure for each cpu, akin to x86-64 and riscv. Pointed
to by x18, which is now reserved for this in the kernel. Tweaked
exception and context switch routines to leave x18 alone.
- Remove the cpu-trapping spinlock logic that is unused in mainline,
probably. (Can add a new version of it back if it's necessary).
- Switch fdtwalk helper to using the newer, cleaner way of initializing
secondaries using the PSCI CPU_ON argument that should be pretty
standard on modern implementations. (Possibly an issue with old
firmware).
- Remove the notion of computing the cpu ID from the Affinity levels,
which doesn't really work properly on modern ARM CPUs which more or
less abandoned the logical meaning of AFFn.
Almost nothing changes here except moving braces to the same line as the
function declaration. Everything else is largely whitespace changes and
a few dangling files with tab indents.
See scripts/codestyle
