a ready-to-use level 1 page table (on sun4m) and MMU context.
A simple `fork()' test shows an improvement in spent system time of
around 4 percent (which is just a bit disappointing, IMO, but it's
an improvement nonetheless).
and use appropriately
- create more helper macros:
. cdev__xyz_init(c,n), such as cdev__ocri_init() for
/* open, close, read, ioctl */, etc.
. cdev__xRy_init(c,n), where nullop is used instead of enodev to dummy out
method `R' and the comments now read /* xxx (read) yyy */ instead
. cdev__xyz_t_init(c,n,t) - as per cdev__xyz_init, but sets d_type = t
as well
- use seltrue instead of dev_noimpl(poll,*), as (IIRC) cdevsw.d_poll should
always DTRT WRT returning a valid result. (a few devices previously
incorrectly returned ENODEV)
- use dev_noimpl(stop,enodev) instead of dev_noimpl(stop,nullop) if tty
== 0, because it doesn't matter if dev_type_stop isn't implemented in that
case, and it allows the use of the cdev__xyz_init macros. certain ports
(sparc,sparc64,x68k) used the nullop method for dev_type_stop in a few
drivers, whereas everything else uses enodev
- ensure that the comments are accurate WRT the behaviour of a given entry
return value of uvm_fault() to the onfault routine via %o0. users of
pcb_onfault now return this value to their callers rather than always
returning EFAULT. this allows i/o errors in VOP_GETPAGES() to be returned
back to read(), etc.
* Print notice if not all CPUs were attached
* Switch to SMP version of cache flush routines in just one place: in
cpu_attach() after all known CPUs have been configured.
- there's no need to have different PV_NC flags for sun4[c] & sun4m
- deal with kvm_uncache() being called on a managed page in a
separate helper function that deals with the caching state
within the pv list for that page, avoiding interference with
the `bad alias' removals in pv_unlink().
Note that currently never called for managed pages, but for now I'm
keeping the support in.
currently necessary to acquire the `running in kernel mode' lock;
pointed out by Bill Sommerfeld/Simon Gerraty.
* remove reference to `cpu_set_kpc()' from comments, as we don't have it.
* message buffer initialisation:
- change the buffer size to 8192 on all platforms
- don't assume the buffer is always located at physical address 0
- drop the SUN4 hack that left first half of the page unused;
I believe this is no longer necessary, since the msgbuf
data structure is duely sanity-checked before use in initmsgbuf().
structure. While this comes with the cost of having to search the
`vm_physmem' array every time need to find a PV entry corresponing to
some physical address, we gain the flexibility needed to support
arbitrary non-contiguous ranges of physical memory addresses.
Also, eliminate the need to sort the memory address ranges as presented
by the machine's PROM, and the requirement that physical memory starts
at address 0 (when possible).
petrov