instead of ldstub, but since we aren't doing n-way locking it makes little
difference. N.B. Need to decide what to do with sparc64/sparc64/asm.h which
has name conflicts with sparc64/include/asm.h. So far most of
sparc64/sparc64/asm.h has been moved to ctlreg.h.
TLBUpdate() routine is used for dual purposes. In TLBmod case, just ok
to call 'tlbwi' (as designed). Result in saving of extraneous execution
path. MIPS1 only this moment.
has PAGEABLE and INTRSAFE flags. PAGEABLE now really means "pageable",
not "allocate vm_map_entry's from non-static pool", so update all map
creations to reflect that. INTRSAFE maps are maps that are used in
interrupt context (e.g. kmem_map, mb_map), and thus use the static
map entry pool (XXX as does kernel_map, for now). This will eventually
change now these maps are locked, as well.
managed pages, into KVA space. Since the pages are managed, we should
use pmap_enter(), not pmap_kenter_pa().
Also, when entering the mappings, enter with an access_type of
VM_PROT_READ | VM_PROT_WRITE. We do this for a couple of reasons:
(1) On systems that have H/W mod/ref attributes, the hardware
may not be able to track mod/ref done by a bus master.
(2) On systems that have to do mod/ref emulation, this prevents
a mod/ref page fault from potentially happening while in an
interrupt context, which can be problematic.
This latter change is fairly important if we ever want to be able to
transfer DMA-safe memory pages to anonymous memory objects; we will need
to know that the pages are modified, or else data could be lost!
Note that while the pages are unowned (i.e. "just DMA-safe memory pages"),
they won't consume any swap resources, as the mappings are wired, and
the pages aren't on the active or inactive queues.
routines now reside in locore.S. No functional difference is expected.
- Replace abused splx() abuse with _splset() to change MIPS processor
interrupt mask bit. 'mips/trap.c' side will be fixed soon.
context, so we must block interrupts which may cause memory allocation
before asserting the kernel pmap's lock. Put this all in PMAP_LOCK()
and PMAP_UNLOCK() macros to make it easier.
