port, which is lifted from amiga port, plus some changes from me:
- Add support for the HP MMU to the 020/030 bus/address error handler
(mostly lifted wholesale from the old code).
- Rename addrerr and buserr to busaddrerr2030. The new name reflects that
these functions are specific to the 68020 and 68030, and that the same
handler function is used for both vectors.
The vector table is patched once we know our CPU type, before the MMU
is enabled. In the event that we're running on a CPU that we're not
configured for, simply invoke the PROM's "reboot request"; we have no
hope of running in the event of a config botch, since we need working
a working bus error handler for console initialization.
These new functions optimze for common-case page faults, eliminate
many run-time checks, and are sharable.
Correct handling for Trap #2 in SunOS executables,
now that we know it is supposed to flush the cache.
(Was thought to be "some obscure FPU operation".)
Frodo ASIC, originally contributed by Mike Smith
<mike@pressed.spam.frisbee.net.au>, but reworked by me to:
- Essentially duplicate the dca driver, modifiying where necessary
to work with the APCI.
- Deal with the different Frodo autoconfiguration model.
- Don't attach a tty to the 0th UART - it's not really useful for much
more than the Domain keyboard.
- Added a routine to check for the existence of a DCA at select code 9.
On most models, the 1'th UART is mapped to select code 9 by the PROM,
and on these models, we do _NOT_ want to attach the device as an APCI.
However, on the 425e, this mapping does not take place, so we attach
as an APCI. The 2'th and 3'th UARTs always get tty instances.
- Add console support which will only be invoked on the 425e (i.e. check
for DCA at 9, and defer console to it if it exists).
the machine, rather than simply returning to the assembly NMI handler.
Previously, the assembly handler would simply jump back to begin:, which
would frob the stack, and re-clear the BSS. However, this is not sufficient,
as there may be state in initialized data that must be restored. Thus,
the only reasonable solution is to re-load the boot block.
by me. This driver should only be invoked when there are no other
suitable console devices present in the system. This situation currently
exists on the 425e, for which we do not have a frame buffer driver,
and who's PROM does not map the second APCI UART to select code 9,
like is done on the 4{00,25,33}{t,s}.
kleink