Compute CPU speed(MHz) and loop multiplier for DELAY() based on
counting empty loop between mcclock ticks. New global: cpu_mhz.
Change pmax/pmax/machdep.c to build baseboard model names from cpu_mhz.
Set 'cpuspeed' for more realistic DELAY() on mips3 models.
Mips CPU constants, testing, and calibration from D. Sean Davidson
<davidson@zk3.dec.com> and Simon Burge <simonb@telstra.com.au>.
* prototype and definition for pmap_activate(p). Updates the segtab,
and changes the active ASID if p == curproc.
* Make reserved fixed-address (UADDR) kernelstack PTEs global,
so we still have a kernel stack after pmap_activate() on curproc.
* make KSEG2 mappings for p_addr global (see above.)
Seems to detune contextswitch and NTP resolution (by 60 ms), but
thepmap_activate() interface is mandatory. Needs more thought.
of cache-index incompatible virtual mappings for a physical page may be
required for hardware without secondary (level 2) cache to detect and
correct virtual coherency problems. I'm not sure this is really needed
anymore, since pmap_prefer() took care of of the cache-index
incompatible mappings that I have seen. Count the times a page is
cache inhibited in enter_stats if DEBUG.
Wait for memory instead of panic() on failure to allocate a page for the
segtab or segmap [from OpenBSD arc port]. Also check for malloc()
failure on allocation of a new pv entry and panic().
Increment resident_count when adding a new page to a pmap [also from
OpenBSD]. Process resident size is now valid.
cache flush operations required on a virtually-indexed, physically-tagged
mips3 with no L2 cache to provide cache-coherence exceptions.
(Similar to what's needed with a virtually-indexed, virtually-tagged cache.)
faults. Use curpcb, which always points to the current pcb. If curproc
was NULL when the kernel faulted, the trap handling would fault recursively
and the kernel stack would overflow.
Has unrolled loop for aligned-to-aligned copy.
Notes:
1. this code tuned for DEC 5000/200. ioasic decstations do more unaligned
copies. Better than old non-unrolled loop, but could be improved.
2. Undoes changes made for MIPS3 with comment implying an r4000 TLB bug.
We can't reproduce this on 5000/150 (jonathan) or 5000/50 (mhitch).
Calls to previous bcopy with a bad address show similar symptoms,
reporting a trap in bcopy() after bcopy() has returned. Same thing??
Needs re-checking on an r4000 with no L2 cache.
sigcode():
executed from user-space stack.
mips1_cpu_switch_resume, mips3_cpu_switch_resume:
arguments passed in via v0, t0, t1 (outlined from cpu_switch())
mips3_VCED(), mips3_VCEI():
called from exception-vector code without any register save,
$at, $ra are live.
undone by rev 1.7:
>redo pmax/include/reg.h
>so that the definitions needed by locore.S are in a separate file,
>pmax/include/regnum.h.
* Add explicit `#include <mips/regnum.h>' where symbolic offsets
into a mips trapframe or struct reg are used..
Add DDB interface to /sys/arch/mips/mips..
Rework heuristic stack traceback to work with DDB.
Add hooks to print exception log from DDB.
Add hooks from pmax console drivers: call Debugger()
after break from serial console, or 'DO' key from LK-xxx.
ktlbmiss on the kernel stack. It was showing the temporary SP, not the
original SP.
Add a display of the first few wired entries of the TLB so when the ktblmiss
occurs, the TLB entries mapping the kernel stack can be verified.
* cpuregs.h:
rename remaining VMMACH_xxx TLB macros to MIPS_TLB_xxx.
Add compile-time MIPS3-only, compile-time MIPS1-only, and
runtime (both) definitions for number of TLB ASIDs (tlb pids)
and shift count to extract a TLB pid.
* locore.h:
Delete unused vector slot for indexed TLB writes.
mips1 and mips3 TLBs are different enough that we have
to break them out at the caller anyway.
* Add compile-time MIPS3-only andcompile-time MIPS1-only
macros to call locore functions directly by name.
Use the existing method table only if
* mips/mips_machdep.c, mips/trap.c, mips/pmap.c, pmax/machdep.c:
Use MIPS3_ or MIPS1_ specific names for TLB pids in
mips3 and mips1 specific code paths (e.g., creating the kernel stack
for process 0).
Add `options MIPS3' to pmax/conf/GENERIC.
Remove unused debug procedure I forgot to remove previously.
Consolidate the vm_page_free1() calls in pmap_release(). Duplicate code
was a result of the way I merged the MIPS3 support from the pica pmap.c.
Enhance the comment on flushing the cache when releasing the segmap pages,
and add a comment about the currently unused code to uncache pages in
pmap_enter_pv().
unsigned cause register wouldn't have worked.
Add missing ')' in trapdump that shows up when compiled with DEBUG.
Fix (unfix?) previous change to printf formats in mips3_dump_tlb: vad_to_pfn
is now consistant with single-CPU and merged-CPU support.
