MFC r276187, r276190, r271422:

Rename pmap_kenter_temp to pmap_kenter_temporary to be consistent with the
other architectures with this function.

Eliminate unnecessary references to pte.h internals by using the standard
pmap_kenter_temporary() to map pages while dumping.

Cleanup up ARM *frame structures.

MFC r273284:

Allow libkvm to get the kernel va to pa delta without the need for
physaddr. This should allow for a kernel where PHYSADDR and KERNPHYSADDR
are both undefined.

For now libkvm will use the old method of reading physaddr and kernaddr
to allow it to work with old kernels. This could be removed in the future
when enough time has passed.

MFC 264990, 264994, 265020, 265025:

Call cpu_icache_sync_range() rather than sync_all since we know the range
and flushing the entire icache is needlessly expensive.

Provide a proper armv7 implementation of icache_sync_all rather than
using armv7_idcache_wbinv_all, because wbinv_all doesn't broadcast the
operation to other cores. In elf_cpu_load_file() use icache_sync_all()
and explain why it's needed (and why other sync operations aren't).

Remove cpu_idcache_wbinv_all() from kdb_cpu_trap(), it's no longer needed.

Explain why wbinv_all is SMP-safe when dumping, and add a missing l2 cache
flush. (Either it was missing here, or it isn't needed in the minidump
case. Adding it here seems like the safer path to consistancy.)

MFC r276187, r276190, r271422:

Rename pmap_kenter_temp to pmap_kenter_temporary to be consistent with the
other architectures with this function.

Eliminate unnecessary references to pte.h internals by using the standard
pmap_kenter_temporary() to map pages while dumping.

Cleanup up ARM *frame structures.

MFC r273284:

Allow libkvm to get the kernel va to pa delta without the need for
physaddr. This should allow for a kernel where PHYSADDR and KERNPHYSADDR
are both undefined.

For now libkvm will use the old method of reading physaddr and kernaddr
to allow it to work with old kernels. This could be removed in the future
when enough time has passed.

MFC 264990, 264994, 265020, 265025:

Call cpu_icache_sync_range() rather than sync_all since we know the range
and flushing the entire icache is needlessly expensive.

Provide a proper armv7 implementation of icache_sync_all rather than
using armv7_idcache_wbinv_all, because wbinv_all doesn't broadcast the
operation to other cores. In elf_cpu_load_file() use icache_sync_all()
and explain why it's needed (and why other sync operations aren't).

Remove cpu_idcache_wbinv_all() from kdb_cpu_trap(), it's no longer needed.

Explain why wbinv_all is SMP-safe when dumping, and add a missing l2 cache
flush. (Either it was missing here, or it isn't needed in the minidump
case. Adding it here seems like the safer path to consistancy.)