Commit Graph

18 Commits

Author SHA1 Message Date
Peter Grehan
a29355a07b Enable the FPU on first use per-thread and save state across context
switches. Not as lazy as it could be. Changing FPU state with sigcontext
still TODO.

fpu.c - convert some asm to inline C, and macroize fpu loads/stores
swtch.S - call out to save/restore fpu routines
trap.c - always call enable_fpu, since this shouldn't be called once
         the FPU has been enabled for a thread
genassym.c - define for pcb fpu flag
2003-03-20 10:28:20 +00:00
Peter Grehan
f86c114f3d Add the USER_SR segment register to pcb state. Initialize correctly,
and save/restore during a context switch.

The USER_SR could be overwritten when the current thread was switched
out with a faulting copyin/copyout.

Approved by: Benno
2002-10-21 05:27:41 +00:00
John Baldwin
33d7ad1abe Set the thread state of the newly chosen to run thread to TDS_RUNNING in
choosethread() in MI C code instead of doing it in in assembly in all the
various cpu_switch() functions.  This fixes problems on ia64 and sparc64.

Reviewed by:	julian, peter, benno
Tested on:	i386, alpha, sparc64
2002-07-12 18:34:22 +00:00
Benno Rice
7ade8bb67c Changes for KSE3.
Submitted by:	Peter Grehan <peterg@ptree32.com.au>
2002-07-09 12:57:23 +00:00
Benno Rice
8b8aa9c1e6 To quote Peter:
The case in cpu_switch() where there isn't a higher priority thread
(choosethread() == curthread) uses r4 as the PCB context pointer. However, the
use of r4 after the label L2 is incorrect, since it was probably trashed by
the call to choosethread, and in any case was set up to curthread at the start
of the routine.

This condition will occur when an interrupt thread schedules a netisr, which
is a lower priority thread.

Another (probably unnecessary) difference is that I was paranoid about
register trashing, so I decided to save r2 and r13 as well.

Submitted by:	Peter Grehan <peterg@ptree32.com.au>
2002-06-29 09:39:44 +00:00
Benno Rice
1d61c15b8a The per-cpu curpmap is now set by pmap_activate. We don't need to do it here
anymore.
2002-05-09 14:13:29 +00:00
Benno Rice
b57e802a85 Commit of stuff that's been sitting in my tree for a while.
Highlights include:
- New low-level trap code from NetBSD.  The high level code still needs a lot
  of work.
- Fixes for some pmap handling in thread switching.
- The kernel will now get to attempting to jump into init in user mode.  There
  are some pmap/trap issues which prevent it from actually getting there though.

Obtained from:	NetBSD (parts)
2002-04-29 12:14:31 +00:00
Benno Rice
677bcc872c cpu_switch now works, for kthreads at least. 2002-02-28 12:06:49 +00:00
Benno Rice
4eed0cf1be Make fork work, at least for kthreads. Switching still has some issues. 2002-02-28 03:24:07 +00:00
Benno Rice
5244eac968 Complete rework of the PowerPC pmap and a number of other bits in the early
boot sequence.

The new pmap.c is based on NetBSD's newer pmap.c (for the mpc6xx processors)
which is 70% faster than the older code that the original pmap.c was based
on.  It has also been based on the framework established by jake's initial
sparc64 pmap.c.

There is no change to how far the kernel gets (it makes it to the mountroot
prompt in psim) but the new pmap code is a lot cleaner.

Obtained from:	NetBSD (pmap code)
2002-02-14 01:39:11 +00:00
John Baldwin
0bbc882680 Overhaul the per-CPU support a bit:
- The MI portions of struct globaldata have been consolidated into a MI
  struct pcpu.  The MD per-CPU data are specified via a macro defined in
  machine/pcpu.h.  A macro was chosen over a struct mdpcpu so that the
  interface would be cleaner (PCPU_GET(my_md_field) vs.
  PCPU_GET(md.md_my_md_field)).
- All references to globaldata are changed to pcpu instead.  In a UP kernel,
  this data was stored as global variables which is where the original name
  came from.  In an SMP world this data is per-CPU and ideally private to each
  CPU outside of the context of debuggers.  This also included combining
  machine/globaldata.h and machine/globals.h into machine/pcpu.h.
- The pointer to the thread using the FPU on i386 was renamed from
  npxthread to fpcurthread to be identical with other architectures.
- Make the show pcpu ddb command MI with a MD callout to display MD
  fields.
- The globaldata_register() function was renamed to pcpu_init() and now
  init's MI fields of a struct pcpu in addition to registering it with
  the internal array and list.
- A pcpu_destroy() function was added to remove a struct pcpu from the
  internal array and list.

Tested on:	alpha, i386
Reviewed by:	peter, jake
2001-12-11 23:33:44 +00:00
Mark Peek
8f718dfdc3 Add enable_fpu/save_fpu for handling the floating point registers in the PCB.
Obtained from:	NetBSD
2001-11-05 00:45:33 +00:00
Mark Peek
585cf148b6 Fix typo. 2001-10-15 01:04:49 +00:00
Mark Peek
422ec2ace1 Save WIP. Partial rewrite of cpu_switch() and savectx(). This makes it closer
to working but still needs some work to properly switch the full context
(such as saving the fpu registers, switch stacks, etc.).  Also, remove some
dead code that was mixed in.
2001-10-15 00:37:45 +00:00
Mark Peek
5fd2c51edb Update PowerPC MD code to compile and do initial bootstrap based on
recent changes (KSE and VM requiring physmem to be setup).

Reviewed by:	benno, jhb, julian
2001-09-20 00:47:17 +00:00
Julian Elischer
b40ce4165d KSE Milestone 2
Note ALL MODULES MUST BE RECOMPILED
make the kernel aware that there are smaller units of scheduling than the
process. (but only allow one thread per process at this time).
This is functionally equivalent to teh previousl -current except
that there is a thread associated with each process.

Sorry john! (your next MFC will be a doosie!)

Reviewed by: peter@freebsd.org, dillon@freebsd.org

X-MFC after:    ha ha ha ha
2001-09-12 08:38:13 +00:00
John Baldwin
bf3db3eacb FreeBSD doesn't use a want_resched variable. Instead, the PS_NEEDRESCHED
p_sflag is managed in a MI fashion.
2001-08-15 19:39:09 +00:00
Benno Rice
f9bac91b18 Bring in NetBSD code used in the PowerPC port.
Reviewed by:	obrien, dfr
Obtained from:	NetBSD
2001-06-10 02:39:37 +00:00