NULL for root PCI busses. For busses behind a bridge, it points to
a persistent copy of the bridge's pcitag_t. This can be very useful
for machine-dependent PCI bus enumeration code.
* Implement a machine-dependent pci_enumerate_bus() for sparc64 which
uses OFW device nodes to enumerate the bus. When a PCI bus that is
behind a bridge is attached, pci_attach_hook() allocates a new PCI
chipset tag for the new bus and sets it's "curnode" to the OFW node
of the bridge. This is used as a starting point when enumerating
that bus. Root busses get the OFW node of the host bridge (psycho).
* Garbage-collect "ofpci" and "ofppb" from the sparc64 port.
Also add correct locking when freeing pages in pmap_destroy (fix from potr)
This now means that arm32 kernels can be built with LOCKDEBUG enabled. (only tested on cats though)
not actually be able to unblock the interrupt, which would cause us
to run the softclock interrupts with hardclock blocked.
Per discussion w/ Charles Hannum.
until the footbridge is attached we still have to rely on a loop. This
uses TIMER_3 running at 100Hz.
Sadly this doesn't appear to fix the tlp problems, which either means that this
delay routine is not as accurate as it should/could be or tlp is still broken.
* pmap_protect(): write back the range when doing a r/w -> r/o
transition. (Still leave the block concerned with this in
pmap_clean_page() disabled, for now.)
* pmap_pte_init_xscale(): Disable read/write-allocate for now, until
we figure out why sometimes cache lines of NULs get deposited into
file data. Also, make sure ECC protection of page table access is
disabled for now.
* xscale_setup_minidata(): Make sure the mini-data cache is configured
write-back with read/write-allocate.
internally). Move arm/iomd/pms* to arm/iomd/opms*. Mechanical change,
tested by cross-compiling a kernel from i386.
Approved by christos.
XXX: What are arm/arm32/conf.c and arm/include/conf.h good for?
* Pull in dev/mii/files.mii from conf/files, rather than playing
the magic "files include order" dance in N machine-dependent
configuration definitions.
cache mode. Add a new XSCALE_CACHE_WRITE_THROUGH option for people who
are paranoid about the cache-related errata (you *do* have to line up
the planets correctly to trip them, but having the option is useful).
file, <arm/cpuconf.h>, which pulls in "opt_cputypes.h" and then defines
the following:
* CPU_NTYPES -- now many CPU types are configured into the kernel. What
you really want to know is "== 1" or "> 1".
* Defines ARM_ARCH_2, ARM_ARCH_3, ARM_ARCH_4, ARM_ARCH_5, depending
on which ARM architecture versions are configured (based on CPU_*
options). Also defines ARM_NARCH to determins how many architecture
versions are configured.
* Defines ARM_MMU_MEMC, ARM_MMU_GENERIC, ARM_MMU_XSCALE depending on
which classes of ARM MMUs are configured into the kernel, and ARM_NMMUS
to determine how many MMU classes are configured.
Remove the needless inclusion of "opt_cputypes.h" in several places.
Convert remaining users to <arm/cpuconf.h>.
read/write-allocate line allocation policy.
On the i80321, this improves nearly every lmbench benchmark, dramatically
so the ones that are sensitive to memory bandwidth (100-300% improvement
for these).
cache, as well. The mini-data cache is 2-way, so src and dst won't
clobber each other, and the smallness of the cache doesn't matter,
since we access each page once sequentially.
While we still have to do the initial clean of the source page, this
saves another 4K of main D$ pollution, and also means we don't have
to do 2 cache passes after the copy is complete (i.e. we can skip the
invalidation of the source page in the main cache, since it's no longer
there).
vs. XScale. Use the mini-data cache for the destination on XScale,
thus saving tossing out 4K of possible-useful data from the main
data cache each time.
This significantly improves every test in lmbench.
and pte_l2_s_cache_mode. The cache-meaningful bits are different
for these descriptor types on some processor models.
* Add pte_*_cache_mask, corresponding to each above, which has a mask
of the cache-meangful bits, and define those for generic and XScale
MMU classes. Note, the L2_S_CACHE_MASK_xscale definition requires
use of the Extended Small Page L2 descriptor (the "X" bit overlaps
with AP bits otherwise).
L1_C_PROTO_xscale; while they are supposed to be set to 1 on generic
ARM MMUs (according to the SA-110 and ARM920T manuals), they are listed
as "should be zero" in the i80200 manual.
