Commit Graph

94 Commits

Author SHA1 Message Date
bde
69fd902223 Fixed style bugs related to the access functions for the bsfl and bsrl
i386 instructions.
2000-01-09 16:46:03 +00:00
peter
15b9bcb121 Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL"
is an application space macro and the applications are supposed to be free
to use it as they please (but cannot).  This is consistant with the other
BSD's who made this change quite some time ago.  More commits to come.
1999-12-29 04:46:21 +00:00
luoqi
bd6a600078 Segment registers can be read(write) to(from) memory locations as well as
general registers.
1999-11-15 19:45:19 +00:00
peter
3b842d34e8 $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
peter
8ffe59d0bf Undo my previous commit and do it differently. Break the ffs() etc macros
into two parts - one to do the bsfl and the other to convert the result
(base 0) to ffs()-like (base 1) in inline C.  This enables the optimizer
to be a lot smarter in certain cases, like where it knows that the argument
is non-zero and we want ffs(known non zero arg) - 1.  This appears to
produce identical code to the old inline when the argument is unknown.
1999-08-19 14:54:40 +00:00
peter
527fa14913 Try using the builtin ffs() for egcs, it (by random inspection)
generates slightly better code and avoids the incl then subl when
using ffs(foo) - 1.
1999-08-19 00:32:48 +00:00
alc
c9e1b9416b atomic.h:
Change "void *" to "volatile TYPE *", improving type safety
	and eliminating some warnings (e.g., mp_machdep.c rev 1.106).

cpufunc.h:
	Eliminate setbits.  As defined, it's not precisely correct;
	and it's redundant.  (Use atomic_set_int instead.)

ipl_funcs.c:
	Use atomic_set_int instead of setbits.

systm.h:
	Include atomic.h.

Reviewed by:	bde
1999-07-23 23:45:50 +00:00
peter
593dd5803d loadandclear() uses an atomic instruction (even on SMP, where it's an
implicitly LOCK'ed instruction), so there shouldn't be any harm in making
it volatile pointer compatable for one of the users of it.  It seems to
generate the same code regardless.
1999-05-09 23:30:01 +00:00
luoqi
af7e9be5cc Enable vmspace sharing on SMP. Major changes are,
- %fs register is added to trapframe and saved/restored upon kernel entry/exit.
- Per-cpu pages are no longer mapped at the same virtual address.
- Each cpu now has a separate gdt selector table. A new segment selector
  is added to point to per-cpu pages, per-cpu global variables are now
  accessed through this new selector (%fs). The selectors in gdt table are
  rearranged for cache line optimization.
- fask_vfork is now on as default for both UP and SMP.
- Some aio code cleanup.

Reviewed by:	Alan Cox	<alc@cs.rice.edu>
		John Dyson	<dyson@iquest.net>
		Julian Elischer	<julian@whistel.com>
		Bruce Evans	<bde@zeta.org.au>
		David Greenman	<dg@root.com>
1999-04-28 01:04:33 +00:00
bde
cea612c782 Don't put operands in clobber lists, since this is dubious for old
versions of gcc and broken for current versions of egcs.

Submitted by:	"John S. Dyson" <dyson@iquest.net> but rewritten by me
1999-01-09 13:00:27 +00:00
bde
b823adf4be Fixed some style bugs. Clarified a comment. 1999-01-08 19:51:02 +00:00
bde
e53595f704 Unspammed includes in <machine/cpufunc.h> in the !SMP case. Partially
unspammed them in the SMP case.
1999-01-08 19:17:49 +00:00
bde
29d4498b94 Moved declarations related to copying and zeroing to the right place. 1999-01-08 16:29:59 +00:00
dfr
c4be7fbe0d Add macros for accessing device memory. 1998-08-17 08:57:05 +00:00
bde
d307f5bacf Don't pretend to support ix86's with 16-bit ints by using longs
just to ensure 32-bit variables.  Doing so broke and/or pessimized
i386's with 64-bit longs (unnecessary use of 64-bit variables
caused remarkably few problems in C code, but the inline asm here
tended to fail because there are no 64-bit registers).  Since the
interfaces here are very machine-dependent and shouldn't be used
outside of the kernel, use a standard types of "known" width instead
of fixed-width types.

Changed all quad_t's to u_int64_t's.  quad_t isn't standard, and
using signed types for 64-bit registers was bogus (but made no
difference).
1998-07-11 04:58:25 +00:00
tegge
0b804fd802 For SMP, use prv_PPAGE1/prv_PMAP1 instead of PADDR1/PMAP1.
get_ptbase and pmap_pte_quick no longer generates IPIs.
This should reduce the number of IPIs during heavy paging.
1998-05-17 18:53:19 +00:00
dyson
154b3ce4e8 Fix alot of silly LINT that I left in the code. 1998-05-12 18:28:05 +00:00
dyson
70ecc33d9f Support better performance with P6 architectures and in SMP
mode.  Unnecessary TLB flushes removed.  More efficient
page zeroing on P6 (modify page only if non-zero.)
1998-05-11 02:13:47 +00:00
kato
c076a7316c Undo previous commit. The cpuid symbol has been already used by SMP
stuff.

Pointed-out by:	Manfred Antar <root@mantar.slip.netcom.com>
1998-01-25 23:45:41 +00:00
kato
a75b33e075 Added cpuid instruction. 1998-01-25 17:02:00 +00:00
gibbs
ea2baad210 Implementation of Bus Space for FreeBSD-x86.
Obtained From: NetBSD
1998-01-15 07:32:56 +00:00
dyson
738872cad6 After one of my analysis passes to evaluate methods for SMP TLB mgmt, I
noticed some major enhancements available for UP situations.  The number
of UP TLB flushes is decreased much more than significantly with these
changes.  Since a TLB flush appears to cost minimally approx 80 cycles,
this is a "nice" enhancement, equiv to eliminating between 40 and 160
instructions per TLB flush.

Changes include making sure that kernel threads all use the same PTD,
and eliminate unneeded PTD switches at context switch time.
1997-12-14 02:11:23 +00:00
fsmp
877f33cf60 General cleanup of the lock pushdown code. They are grouped and enabled
from machine/smptests.h:

#define PUSHDOWN_LEVEL_1
#define PUSHDOWN_LEVEL_2
#define PUSHDOWN_LEVEL_3
#define PUSHDOWN_LEVEL_4_NOT
1997-09-07 22:04:09 +00:00
fsmp
e771ecca0f General cleanup of the sub-system locking macros.
Eliminated the RECURSIVE_MPINTRLOCK.
clock.c and microtime use clock_lock.
sio.c and cy.c use com_lock.

Suggestions by:	Bruce Evans <bde@zeta.org.au>
1997-09-01 07:45:37 +00:00
fsmp
e2310cdbcf Another round of lock pushdown.
Add a simplelock to deal with disable_intr()/enable_intr() as used in UP kernel.
UP kernel expects that this is enough to guarantee exclusive access to
regions of code bracketed by these 2 functions.
Add a simplelock to bracket clock accesses in clock.c: clock_lock.

Help from:	Bruce Evans <bde@zeta.org.au>
1997-08-30 08:08:10 +00:00
dyson
b39089e3e9 Add support for 4MB pages. This includes the .text, .data, .data parts
of the kernel, and also most of the dynamic parts of the kernel.  Additionally,
4MB pages will be allocated for display buffers as appropriate (only.)

The 4MB support for SMP isn't complete, but doesn't interfere with operation
either.
1997-07-17 04:34:03 +00:00
peter
fbe84f722a remove #include of <machine/spl.h> - they are externed now
Reviewed by: bde
1997-05-31 09:13:03 +00:00
jdp
0d42d75ea0 Make setbits() SMP-safe. Eliminate the SETBITS() macro, and replace
all uses of it with the equivalent calls to setbits().

This change incidentally eliminates a problem building ELF kernels
that was caused by SETBITS.

Reviewed by:	fsmp, peter
Submitted by:	bde
1997-05-21 22:56:05 +00:00
peter
ba911fbf39 remove #include "opt_smp.h" and <machine/smp.h>. Slightly elaborate on
a comment.
1997-05-07 19:51:59 +00:00
fsmp
ecd7dfd828 remove all the SMP_INVLTLB defines, making the code default for APIC_IO.
Reviewed by:	informal discussion with Peter Wemm <peter@spinner.DIALix.COM>
1997-04-28 00:25:00 +00:00
peter
2302234a84 Try and make these usermode safe, Steve beat me in finding these.. 1997-04-26 20:04:21 +00:00
peter
6323aa10bf Man the liferafts! Here comes the long awaited SMP -> -current merge!
There are various options documented in i386/conf/LINT, there is more to
come over the next few days.

The kernel should run pretty much "as before" without the options to
activate SMP mode.

There are a handful of known "loose ends" that need to be fixed, but
have been put off since the SMP kernel is in a moderately good condition
at the moment.

This commit is the result of the tinkering and testing over the last 14
months by many people.  A special thanks to Steve Passe for implementing
the APIC code!
1997-04-26 11:46:25 +00:00
kato
51253b5e70 Improved CPU identification and initialization routines. This
supports All Cyrix CPUs, IBM Blue Lightning CPU and NexGen (now AMD)
Nx586 CPU, and initialize special registers of Cyrix CPU and msr of
IBM Blue Lightning CPU.

If revision of Cyrix 6x86 CPU < 2.7, CPU cache is enabled in
write-through mode.  This can be disabled by kernel configuration
options.

Reviewed by:	Bruce Evans <bde@freebsd.org> and
            	Jordan K. Hubbard <jkh@freebsd.org>
1997-03-22 18:54:54 +00:00
peter
94b6d72794 Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not
ready for it yet.
1997-02-22 09:48:43 +00:00
jkh
808a36ef65 Make the long-awaited change from $Id$ to $FreeBSD$
This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore.  This update would have been
insane otherwise.
1997-01-14 07:20:47 +00:00
bde
1f72e78389 Added "memory" to clobber list in invlpg(). It needs it if invltlb()
needs it.

Fixed style in invlpg().

Sorted recently renamed functions.

Added prototypes in the non-gcc section for recently added/renamed
functions.
1996-09-29 18:35:07 +00:00
dyson
58c3d8c035 Essentially rename pmap_update to be invltlb. It is a very machine
dependent operation, and not really a correct name.  invltlb and invlpg
are more descriptive, and in the case of invlpg, a real opcode.

Additionally, fix the tlb management code for 386 machines.
1996-09-28 22:37:57 +00:00
dyson
087fec3920 Move pmap_update_1pg to cpufunc.h. Additionally,
use the invlpg opcode instead of the nasty looking .byte directives.
There are some other minor micro-level code improvements to pmap.c
1996-09-28 04:22:46 +00:00
bde
5200f0a42d Fixed a few hundred warnings (2400 in LINT) for signed vs unsigned
comparisons in the inb() and outb() macros.  I decided that int args
are OK here.  Any type that can hold a u_int16_t without overflow
is correct, and 32-bit types are optimal.

Introduced a few tens of warnings (100 in LINT) for use of pessimized
(short) types for the port arg.  Only a few drivers are affected by
this.  u_short pessimizations aren't detected.

Added `__extension__' before the statement-expression in inb() so
that it can be compiled without warnings by gcc -pedantic.
1996-09-24 17:47:59 +00:00
asami
eb29d43f47 Another round of merge/update.
(1) Add PC98 support to apm_bios.h and ns16550.h, remove pc98/pc98/ic
(2) Move PC98 specific code out of cpufunc.h (to pc98.h)
(3) Let the boot subtrees look more alike

Submitted by:	The FreeBSD(98) Development Team
		<freebsd98-hackers@jp.freebsd.org>
1996-09-12 11:12:18 +00:00
wollman
6480d29561 Add an fls() inline function which does the opposite operation to
ffs().  (That is to say, it searches in the opposite direction.)
1996-08-01 20:29:28 +00:00
asami
80d0633189 Update to current state of PC98 world.
Submitted by:	The FreeBSD(98) development team
1996-07-23 07:46:59 +00:00
bde
325165ab60 Fixed lots of warnings about unportable casts of pointers to volatile
variables: don't depend on the compiler generating atomic code to set
the variables - use inline asm to specify the atomic instruction(s)
explicitly.
1996-07-01 20:16:10 +00:00
bde
9f2f4504f0 Moved declarations of non-cpu things from <machine/cpufunc.h> to better
places.
1996-07-01 18:12:24 +00:00
asami
36a1932601 The Great PC98 Merge.
All new code is "#ifdef PC98"ed so this should make no difference to
PC/AT (and its clones) users.

Ok'd by:	core
Submitted by:	FreeBSD(98) development team
1996-06-14 11:02:28 +00:00
bde
b6732671c1 Changed bdb() to breakpoint() and always enable it.
Made the style more consistent, especially for the new Pentium functions.
1996-04-07 18:30:56 +00:00
bde
b26bbde39a Moved rtcin() to clock.c.
Always delay using one inb(0x84) after each i/o in rtcin() - don't
do this conditional on the bogus option DUMMY_NOPS not being defined.
If you want an optionally slightly faster rtcin() again, then inline
it and use a better named option or sysctl variable.  It only needs
to be fast in rtcintr().
1996-03-31 04:05:36 +00:00
wollman
0c6a9cd275 >Blush<. Use the correct opcode for the WRMSR instruction. 1996-03-28 20:39:45 +00:00
wollman
cbb78b9a73 Add support for Pentium and Pentium Pro performance counters.
(This code is as yet untested; to come after man page is written.)
This also adds inlines to cpufunc.h for the RDTSC, RDMSR, WRMSR, and RDPMC
instructions.  The user-mode interface is via a subdevice of mem.c;
there is also a kernel-size interface which might be used to aid
profiling.
1996-03-26 19:57:56 +00:00
bde
d4ab6cfcb3 Removed declarations of nonexistent functions. 1996-01-16 07:42:08 +00:00