be properly used by any misc. cloning device. While here, correct
a comment to indicate that "open" is the only entry point and that
everything else is handled with fileops.
use the right places in the trap frame (the 4 segment registers which
get loaded on a rti to VM86 mode) to set them for BIOS calls
(we have never set them to anything but 0 before, so it didn't matter)
8-bit pseudo color and text modes
still doesn't do anything useful
(It would be easy to attach a wsdisplay, but we have to cooperate with the
PCI or ISA attached VGA drivers. There are open issues.)
BIOS calls can be used for device probing etc.
And now it's getting nasty:
The kvm86 code needs a TSS, and it is most convenient to use proc0's
instead of doing some static allocation. (We might reconsider this if
we want to use vm86 for console initialization, ie much earlier.)
For the TSS slot to be allocated, we have to move the call to
i386_proc0_tss_ldt_init() up.
Since the npx code twiddles CR0 the corresponding pcb field must
be synchronized later. It would probably be cleaner to do this in
the npx driver.
8086 machine. Ifff it works, it is much easier and more elegant than
going to real real mode:
-simpler code
-no need for "identity" memory mappings
-easy passing of buffers for bulk data to functions
-some more control
There is no interrupt support ATM, and it lacks a function to access
random virtual memory of the VM. MP issues to consider.
MALLOC_NOINLINE, and VNODE_OP_NOINLINE. The exceptions are when they
include another config files that already defines the options, or if
they are for an embedded board, just define a few extra options, and
do not already define PIPE_SOCKETPAIR.
* struct sigacts gets a new sigact_sigdesc structure, which has the
sigaction and the trampoline/version. Version 0 means "legacy kernel
provided trampoline". Other versions are coordinated with machine-
dependent code in libc.
* sigaction1() grows two more arguments -- the trampoline pointer and
the trampoline version.
* A new __sigaction_sigtramp() system call is provided to register a
trampoline along with a signal handler.
* The handler is no longer passed to sensig() functions. Instead,
sendsig() looks up the handler by peeking in the sigacts for the
process getting the signal (since it has to look in there for the
trampoline anyway).
* Native sendsig() functions now select the appropriate trampoline and
its arguments based on the trampoline version in the sigacts.
Changes to libc to use the new facility will be checked in later. Kernel
version not bumped; we will ride the 1.6C bump made recently.
- replace all "atapibus* at XXXX" with a single "atapibus* at atapi?"
- replace all "audio* at XXXX" with a single "audio* at audiobus?"
- replace all "midi* at XXXX" (except "midi* at pcppi?") with a single
"midi* at midibus?"
sigcode), arrange to have the signal handler invoked directly, using
the trampoline only for the return path, saving a call insn. Play
some other stack trickery in the trampoline to turn 2 pushl's into
one movl.
