- Fix up usage of MBD_ISPID().
- Ensure that we never deal with a NULL proc, and if our proc has
no pcb, punt. Suggested by Gordon Ross.
- Eliminate some redundant NULL pointer checks in the T_MMUFLT cases;
proc0.p_addr is now initialized early, and we make a single test
for sanity at the top of trap() now.
- Initialize proc0.p_addr just after setting up the kernel stack, to avoid
getting NULL pointers in trap(). Change suggested by Gordon Ross.
- Panic if main() returns.
- Tidy up a couple of comments.
(remaps page read/write/cache-inhibit, does write, restores previous
mapping). Kernel text no longer needs to be read/write with DDB/KGDB
is in the kernel.
Based on a similar module written for the Sun3 port by Gordon Ross,
and modified somewhat by me.
- Offset kernel text one page. Stash the PA of this offset page for
use later.
- Add a few comments.
- Free up some registers earlier in the initialization process.
- Use a `prototc' to set the Translation Control register, rather
than relying on a2 pointing just past the MMU trampoline in the
high page. (Suggested by Charles Hannum.)
- Set VBR to the kernel vector table just before turning on the MMU.
- Just before rebooting, set VBR to 0, which is what the BOOTROM expects
it to be.
kernel setroot(). The device type for network boot is set like any
other device now. Also, call the punit entry point for device drivers
to properly set `bootdev'.
The "options GENERIC" entry in kernel config files is not longer necessary
for "swap generic" kernels. Uses new config constructs which work with
some glue in an old config environment. This code will support new config
with minimal changes.
an unrecognized keyboard produced garbage on keypresses in the kernel,
but worked in the boot program (which has this default). The bug is
that the keymap pointers are unitialized.
- Only pass user trace traps and breakpoints on to trap().
Gets rid of some hair in the trace/breakpoint trap cases.
- Before entering the debugger, switch to a temporary
stack so that the debugger can alter the stack pointer.
- Add glue for KGDB (still not complete).
Some other minor cleanup:
- Protect against some bad pointer derefs.
- Be more a little more verbose when a fatal trap
occurs to aid debugging.
- Only pass user trace traps and breakpoints on to trap().
- Before entering the debugger, switch to a temporary
stack so that the debugger can alter the stack pointer.
- Add glue for KGDB (still not complete).
Clearly mark the MMU enable trampoline code.
the keyboard to work. Fixes a bug where booting with `-d' worked
only on systems using a serial console.
While I'm here, eliminate some redundancy in the ite console intialization
code.
This fixes a critical bug where a clock interrupt would happen sometime
between the call to hp300_calibrate_delay() and when proc0 is initialized.
This ends up dereferencing a bad pointer in itimerdecr(), which scribbles
over the first page of kernel text, specifically vectors 46 and 47 (decimal).
To complicate matters, the way the bug manifested itself was different
depending on whether or not DDB was configured into the kernel. When
DDB is in the kernel, kernel text is mapped read/write. When DDB is not
in the kernel, kernel text is mapped read-only. Note that the kernel
scribble happens early, typically before the console is initialized.
In the non-DDB case, the kernel will hang as soon as it's loaded because
the access causes a fault (before the console is initialized, so you
don't see the trap).
In the DDB case, the access does _not_ cause a fault. However, the
mechanism used to enter the kernel debugger is to issue a "trap #15".
Conveniently, this is one of the corrupted vectors (47), thus rendering
DDB useless (it actually caused a recursive panic/trap loop).
This _WILL_ be in the first 1.2 official patch.
* SunOS glue
* 68060 exception frame size definitions
* 68060 fault detection macros
- Use `cputype' rather than `mmutype' where appropriate.
- Play the prototype game.
This file is much closer to being sharable by all m68k ports.
* Make S expand to an absolute path at compile time.
* Use `-S' rather than `-x' to remove debugging symbols.
* Garbage collect unused variables.
* Reverse a handful of port-specific changes that do not correspond to
the common build model and are not needed.
a boot string for firmware that can do this, such as the SPARC and
the sun3 models. It is currently silently ignored on all other
hardware now, however. The MD function "boot()" has been changed to
also take a char *.
- Good bye SYS_PBOOT and SYS_NBOOT, hello SYS_UBOOT (unified boot)
Currently supports booting from SCSI and HP-IB disk and network
from a single boot block. Infrastructure for booting from
HP-IB tape is there, but it doesn't quite work yet.
- Add a slightly modified version of Gordon Ross's "rawfs",
which provides a filesystem-like interface to tape devices.
Still needs debugging (see above).
- Rename sys_inst.c to inst.c, so that the LIF directory entry
turns out right (used to look like SYS_SYS_I if loaded from
tape).
- Add a "netio_ask" hint to netio.c, so that a special instnetio.o
doesn't have to be compiled for SYS_INST. Defaults to using
bootparams, but if set, will prompt user for information
usually obtained from bootparams.
- General cleanup.
- New delay() function, modeled after sun3/mvme68k delay,
calibrated with a model's known cpu speed.
- Use the defined constants for machineid and ectype
when determining what kind of machine we have, rather
than their expanded equivalents, for clarity.
- Move the vector table to the data segment so that it
can be patched at run-time.
naming conflicts between bus attachments on ports that can have
multiple instances of the LANCE.
Changed struct ifnet to have a pointer to the softc of the underlying
device and a printable "external name" (name + unit number), thus eliminating
if_name and if_unit. Updated interface to (*if_watchdog)() and (*if_start)()
to take a struct ifnet *, rather than a unit number.
remove their 'integrate' (usually defined to be 'static') keywords.
when lance drivers are split up by attachment, more than one file will
reference the copy/zero functions (i.e. not just the file that pulls in
am7990.c... and eventually inclusion of am7990.c should go away entirely).
execpt without quotes. meant to be __CONCAT()ted for easy #includes
of machine-dependent headers for MI code (e.g. for the MI ISA/EISA/PCI/TC
bus code).
outside of "internal i/o" space to not even have a chance at console-hood.
Fix tested by Thorsten Frueauf <frueauf@ira.uka.de>, and offered with
my sincerest apologies that the bug ever existed in the first place.
a dca-specific constant. For now, hardwire standalone DCA console
at select code 9 (which is what the old constant expanded to). Really
should make the way the bootblock console is probed look just like how
the kernel console is probed.
- Interrupt service routines now take a pointer to
the device's softc, rather than a unit number.
- Interrupt handling code in locore.s condensed. Only
remaining "special" handlers are lev0 (spurious),
lev1 (HIL; don't ask), lev6 (clock), and lev7 (NMI).
Only remaining hard-coded device driver reference in
locore is HIL. (clock doesn't count...)
- "dcafastservice" eliminated. DCA driver has new mechanism
to guarantee prompt interrupt service at any ipl (not
just level 5).
- Interrupt code pulled out of autoconf.c and machdep.c and
placed in new file, isr.c
to a softc, rather than a unit number. Add a "dq_softc" member
to struct devqueue; this is a temporary measure until the
dma/controller/device callback spaghetti is untangled.
YAY! No more need for dcafastservice!
HIL: squish instances of "(void) splhil()" and "(void) spl0();".
intent for the value of the C_REL constant was 0xc0. Testing has turned
up no adverse effect on tape or disk devices, and in fact this change
apparently makes my 9145 tape work as expected. (!) Closes PRs 1874 and
1971.
