- Add event counters for some key pmap events (similar to mpc6xx pmap).
- Use the cache-friendly, optimised copy/zero page functions.
- Add the necessary cache management code to enable WriteBack caching
of KSEG1 mappings. Seems to work fine so far.
* Fix problems with the DMA and SCSI drivers.
* Make turbo machines sort of work.
Additional fixes from me:
* Determine if we're a turbo at boot time, by looking at the ROM machine type.
* Set the display size correctly (1120 pixels wide, but padded to 1152 only on
non-turbo machines).
Caveats:
* SCSI doesn't work on the turbo (or at least it blows chunks with no devices
attached).
* Media selection doesn't work on the turbo (the BMAP stuff doesn't exist on
turbo machines).
* The boot block is prone to timing out.
- Use the PMAP_ASID_* constants from pmap.h
- Track pmap_pvo_{enter,remove}() depth in the same way as mpc6xx's pmap
(on which this pmap was originally based).
- Some misc. tidying up and added commentary.
- Use the VA/KVA to select whether to use the IPT or PTEG instead of
checking which pmap is being operated on.
- Add a handy DDB-callable function which will scan the kernel IPT
looking for inconsitencies.
- Finally, when unmapping a pool page, purge the data cache for the
page. This permits write-back caching to be enabled for kernel
text/data.
machine-specific code.
- Re-work the code which detects a nested critical section event.
We can now determine who is the owner of the critical section, and
what event occurred while it was owned.
- Work-around a silicon bug which can cause a nested critical event.
In the _EXCEPTION_ENTRY() macro (which sets up the critical section),
if there is a pending hardware interrupt which has a higher priority
than the current IMASK, then the "putcon" which supposedly clears SR.BL
and sets SR.IMASK to 0xf is not atomic. The pending hardware interrupt
will be taken, causing a nested critical section event. The work-around
is to update SR.BL and SR.IMASK separately using two "putcon" insns.
- Make it possible to at least *try* to resume execution if we
get an NMI.
- Major clean-up of the panic/critical section trap handlers.
The dumped state is now much more accurate.
minoura