port-arm/58106: rump cpu_info doesn't work with cpu cache management function

[campbell+netbsd%mumble.net@localhost]

>Number:         58106
>Category:       port-arm
>Synopsis:       rump cpu_info doesn't work with cpu cache management function
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-arm-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Apr 02 20:25:00 +0000 2024
>Originator:     Taylor R Campbell
>Release:        current, 10, 9, ...
>Organization:
The NetCPU Funcdation
>Environment:
>Description:
rump machine/cpu.h provides its own struct cpu_info, which has no ci_cpufuncs member.

Consequently, the kernel cpu cache management functions like cpu_icache_sync_range don't work:

In file included from ./arm/cpufunc.h:445,
                 from ./aarch64/sljit_machdep.h:37,
                 from ./machine/sljit_machdep.h:4,
                 from /home/riastradh/netbsd/10/src/sys/rump/kern/lib/libsljit/../../../../external/bsd/sljit/dist/sljit_src/sljitConfig.h:60,
                 from /home/riastradh/netbsd/10/src/sys/rump/kern/lib/libsljit/../../../../external/bsd/sljit/dist/sljit_src/sljitLir.h:76,
                 from /home/riastradh/netbsd/10/src/sys/rump/kern/lib/libsljit/../../../../external/bsd/sljit/dist/sljit_src/sljitLir.c:29:
/home/riastradh/netbsd/10/src/sys/rump/kern/lib/libsljit/../../../../external/bsd/sljit/dist/sljit_src/sljitNativeARM_64.c: In function 'sljit_generate_code':
./aarch64/cpufunc.h:105:10: error: 'struct cpu_info' has no member named 'ci_cpufuncs'
  105 |  curcpu()->ci_cpufuncs.cf_icache_sync_range((v),(s))
      |          ^~
./aarch64/sljit_machdep.h:48:2: note: in expansion of macro 'cpu_icache_sync_range'
   48 |  cpu_icache_sync_range((vaddr_t)(from), (vsize_t)((to) - (from)))
      |  ^~~~~~~~~~~~~~~~~~~~~

>How-To-Repeat:
Try to compile kernel code that uses cpu_icache_sync_range, like sljit, in rump.
>Fix:
Add ci_cpufuncs to rump's struct cpu_info with compatible definitions, maybe implemented in terms of __builtin___clear_cache.