sysio streaming buffer flushes write a single 8-byte aligned 8-byte
value.
psycho streaming buffer flushes write a 64-byte aligned 64-byte block.
So separate out the streaming buffers into their own structure and pass those
in to all iommu operations. This also means we only flush the correct
streaming buffer for psycho rather than needing to flush both just in case.
bus_space_handle_t now holds an address and two ASIs, one for normal accesses
and one for streaming accesses. This allows to map individual handles
different ways, so some can use MMU bypass accesses and others use virtual
addresses. bus_space_map() will now create handles that use bypass accesses
unles BUS_SPACE_MAP_LINEAR is passed in. So only pass in BUS_SPACE_MAP_LINEAR
if you absolutely *need* to use bus_space_vaddr(). This removes at least one
extra level of indirection and should reduce TLB misses.
32-bit kernels have problems accessing 64-bit addresses, so they always use
virtual addresses.
- merge IOMMU DVMA code from sbus/psycho into iommu.c. this code was
identical and a few minor inconsistencies had crept in. this way
keeps them all in sync.
- with this code gone from psycho, merge the psycho.c and psycho_bus.c
files. same with ebus/ebus_bus.c. delete the _bus.c files.
- add a _ds_boundary member to the dma segment structure, so that later
dma mappings can find this value.
- set _ds_boundary in machdep.c:_bus_dmamem_alloc().
- kill much dead code.
- in sbus_get_intr(), if we are not an onboard device (ie, sbus card),
encode the slot number into the sbi_pri so that we can later extract
it and use it to find the interrupt map & clear registers for this
device.
- remove "intr" support as it is really pre-sun4u only.
- don't "pause" for so long in sbus interrupt debug messages..
with the slot number being passed back from sbus_get_intr(), the FS/BE
card in an ultra2 now appears to get interrupts and gets beyond
waiting for the scsibus probe!
Remove the entire idea of fasttrap interrupts since V9 traps are really cheap,
the CPUs are really fast, and the completely different trap frames would make
these handlers really difficult to implement.
pmap_changeprot() was only used by the clock and one other place; deprecate it.
probeget() and probeset() now take 64-bit addresses even in 32-bit mode so we
can probe IO locations by physical addresses.
Some pmap cleanup.
Some more copyright cleanup.
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.
* Map the message buffer with access_type = VM_PROT_READ|VM_PROT_WRITE `just
because'.
* Map the file system buffers with access_type = VM_PROT_READ|VM_PROT_WRITE to
avoid possible problems with pagemove().
* Do not use VM_PROT_EXEC with either of the above.
* Map pages for /dev/mem with access_type = prot. Also, DO NOT use
pmap_kenter() for this, as we DO NOT want to lose modification information.
* Map pages in dumpsys() with VM_PROT_READ.
* Map pages in m68k mappedcopyin()/mappedcopyout() and writeback() with
access_type = prot.
* For now, bus_dma*(), pmap_map(), vmapbuf(), and similar functions still use
access_type = 0. This should probably be revisited.
Added genassym.cf
Removed lderr which should never have gotten in
Removed lots of dead code from locore.s
Added some softint stuff to intr.c
Added support for halt -p
esp and le both use bus_dmamap_*() functions now
instead of kdvma_mapin()
groundwork for PCI (but we still have no drivers for
any sun4u PCI devices)
