freebsd-skq/sys/i386
Peter Wemm 37b087a645 Clean up some low level bootstrap code:
- stop using the evil 'struct trapframe' argument for mi_startup()
  (formerly main()).  There are much better ways of doing it.
- do not use prepare_usermode() - setregs() in execve() will do it
  all for us as long as the p_md.md_regs pointer is set.  (which is
  now done in machdep.c rather than init_main.c.  The Alpha port did it
  this way all along and is much cleaner).
- collect all the magic %cr0 etc register settings into one place and
  have the AP's call that instead of using magic numbers (!!) that keep
  changing over and over again.
- Make it safe to call kthread_create() earlier, including during the
  device probe sequence.  It doesn't need the callback mechanism that
  NetBSD's version uses.
- kthreads created this way are root-less as they exist before the root
  filesystem is mounted.  init(1) is set up so that it aquires the root
  pointers prior to running.  If other kthreads want filesystem acccess
  we can make this code more generic.
- set all threads start times once we have decided what time it is.
- init uses a trampoline rather than the evil prepare_usermode() hack.
- kern_descrip.c has a couple of tweaks to deal with forking when there
  is no rootdir or cwd etc.
- adjust the early SYSINIT() sequence so that a few prereqisites are in
  place. eg: make sure the run queue is initialized before doing forks.

With this, the USB code can easily create a kthread to do the device
tree discovery.  (I have tested it, it works nicely).

There are still some open issues before this is truely useful.
- tsleep() does not like working before the clock is running.  It
  sort-of tries to spin wait, but it can do more useful things now.
- stopping a kthread in kld code at unload time is "interesting" but
  we have a solution for that.

The Alpha code needs no changes for this.  It already uses pretty much the
same strategies, but a little cleaner.
2000-08-11 09:05:12 +00:00
..
apm Cleanup debug messages and Add some enhancements from linux on 2000-08-04 20:28:53 +00:00
bios Cleanup debug messages and Add some enhancements from linux on 2000-08-04 20:28:53 +00:00
conf Fix the comments to properly document the PQ_MEDIUMCACHE and 2000-08-08 08:13:01 +00:00
i386 Clean up some low level bootstrap code: 2000-08-11 09:05:12 +00:00
ibcs2 Regen. (Fix SYS_exit) 2000-07-29 10:07:38 +00:00
include Clean up some low level bootstrap code: 2000-08-11 09:05:12 +00:00
isa Change the behavior of isa_nmi to log an error message instead of 2000-08-06 14:17:21 +00:00
linux Regen. (Fix SYS_exit) 2000-07-29 10:07:38 +00:00
pci Add PnP probe methods to some common AT hardware drivers. In each case, 2000-06-23 07:44:33 +00:00
svr4 AT&T asm syntax requires a leading '*' in front of the operand for indirect 2000-05-10 01:21:15 +00:00
Makefile Update tags directive to reflect the new location of soft updates 2000-07-04 00:18:43 +00:00