Transition to cargo workspace

build.rs now adapts link.x for the target arch

Ensure sp is 16-byte aligned

Signed-off-by: Chien Wong <m@xv97.com>

Fix setting incorrect sp if single-hart

Signed-off-by: Chien Wong <m@xv97.com>

Signed-off-by: Chien Wong <m@xv97.com>

If single-hart is enabled, the sp is set to _stack_start - _hart_stack_size,
rather than _stack_start. Fix this.

Fixes: e540f1e4

 ("Add feature single-hart")
Signed-off-by: Chien Wong <m@xv97.com>

Ignore hartid in single-hart mode.

Don't bother checking hart ID on startup in single-hart mode. Allows
use of cores with unusual mhartid values and saves a few instructions.

Remove FCSR

Update embedded-hal to 1.0

remove peripheral module

Add CI for CHANGELOG.md file

Remove label-check from merge_group

It seems that the action used to check forbidden labels only works for PRs. Removing it from merge_group.

Check CHANGELOG.md on PRs to master

Removing user mode registers

Implement r0 crate in assembly