userlevel; this is necessary due to the 601, unlike other 6xx, having
no concept of separated Valid_user vs. Valid_supervisor for BATs.
* When crossing the kernel/userlevel boundary, have platform-provided
hooks set up the two fixed BAT entries, and possibly additional
segment registers to redeem the 601's BAT limitations.
Both of the above are only built if the $MACHINE provides these hooks,
sparing others the pain.
so that they're more useful for arbitrary types of external storage:
* Add an "mbuf *" argument to (*ext_free)(). If non-NULL, (*ext_free)()
is expected to free the mbuf itself. This allows (*ext_free)() to use
the mbuf for bookkeeping (e.g. deferring the work to a helper thread).
If the "mbuf *" argument is NULL, we are assumed to be in a context
which is safe for performing the destructor operation *now*.
* Adjust MEXTREMOVE() and MFREE() routines for above change.
* Update "ade" and "ti" drivers for new semantics.
eliminate a race where another processor could grab the outgoing
process before we were done saving our state into it, with predictable
results.
Bug spotted on i386 by Frank van der Linden <fvdl@wasabisystems.com>.
generally translates to "high interrupt load") -- the old code re-enabled
interrupts in the machine-specific hardware interrupt handler causing the
handler to be re-entered, possible multiple times. Could lead to kernel
stack overflows, and all sorts of mysterious crashes/hangs as a result.
While here, fix up the IP32 interrupt handler code to also not re-enable
interrupts.
Thanks for ideas/comments go to Chuq and Stephen Ma.
* make kloader optional.
* default value of kernel path is KLOADER_KERNEL_PATH.
* options KLOADER_KERNEL_PATH can override kernel path.
* when bootstr is passed (RB_STRING), use it as kernel path.
Note:
(1) Character device major number chages to 49 from 48(in my original
code). So it is necessary to rebuild device files.
(2) Must use Booter 2.0.0a10 or later.
(3) Default mode is cpu busy wait. It is defined by flags 0x1000.
It will be more slow than before.
No flags means hardware interrupt mode. But it might be able to
get no interrupts.
Support machines:
(1) Quadra 630 series
(2) PowerBook 150
Non tested machine:
(1) PowerBook 190 series
Approved by: briggs
* default value of kernel path is KLOADER_KERNEL_PATH.
* options KLOADER_KERNEL_PATH can override kernel path.
* when bootstr is passed (RB_STRING), use it as kernel path.
request (not always the passed in DMA tag if we try direct-map
and then fall back to sgmap-mapped). Use the actual window
when performing dmamap_sync and dmamap_unload operations.
Fixes DMA resource leak on systems with 2G+ RAM. Thanks to
Matt Thomas for help debugging this.
rjs