Commit Graph

39 Commits

Author SHA1 Message Date
kmacy
8c05b8ec89 Integrate support for xen in to i386 common code.
MFC after:	1 month
2008-08-15 20:51:31 +00:00
peter
7bc6e7456e Change the segment limits to 4GB, we set the user accessible bit on all
of the kernel address space already.  Intel recommend this anyway, because
using a non-4GB limit adds an additional clock cycle to address generation.
We were able to install 4GB segments into the LDT, so any limits we imposed
on %cs and %ds were academic anyway.  More importantly, this allows us to
make a page in the kernel readable to user applications, for holding things
like the signal trampoline and other fun things.

Move the user %cs/%ds segments from the LDT to the GDT.  There was no good
reason for them to be there anyway.  The old LDT entries are still there
but we can now relax the restriction that prevented users from emptying
the default LDT entries.

Putting user and kernel %cs and %ds together allows us to access the fast
sysenter/sysexit/syscall/sysret instructions.  syscall/sysret in particular
require that the user/kernel segments be laid out this way.  Reserve a slot
specifically for NDIS while here.

Create two user controllable slots in the GDT that are context switched
with the (kernel) thread.  This allows user applications to set two
user privilige selectors to arbitary values.  Create
i386_set_fsbase(void *base) and friends. (get/set, fs/gs).  For i386,
%gs is used by tls and the thread libraries and this means that user
processes no longer have to have the cost of having a custom LDT, and
we will no longer to do a ldt switch when activating a kthread/ithread in
the usual case any more.

In other words, we can now set the base address for %fs and %gs to arbitary
addresses without the pain of messing with ldt segments.
2005-04-13 22:57:17 +00:00
imp
b49b7fe799 Remove advertising clause from University of California Regent's
license, per letter dated July 22, 1999 and email from Peter Wemm,
Alan Cox and Robert Watson.

Approved by: core, peter, alc, rwatson
2004-04-07 20:46:16 +00:00
jhb
7ed7a0db1d - Always use 256 IDT entries since it is now a runtime decison as to how
many entries we use.
- Add a constant IDT_IO_INTS for the first IDT entry used for device
  interrupts.
2003-11-03 21:12:04 +00:00
jhb
17278d122d Always export r_gdt and r_idt and give them extern declarations in
machine/segments.h.
2003-10-30 21:42:17 +00:00
jhb
16813b6997 Add constants for entries in the IDT and use those instead of magic
numbers.
2003-09-10 01:07:04 +00:00
jake
ae6dbfd8a7 Remove BDE_DEBUGGER.
Discussed with:	bde
2003-01-28 19:05:44 +00:00
peter
1a6bc64814 ISMEMSDP(), IS286GDP(), IS386GDP(), ISGDP(), ISSDP() and ISSYSSDP() are
not used anywhere anymore.
2002-09-26 05:07:41 +00:00
peter
6fedca521d use __packed, rather than __attribute__((packed)). 2002-09-23 06:50:07 +00:00
peter
e8f9ac26c8 Create inlines for ltr(sel), lldt(sel), lidt(addr) rather than
functions that have one instruction.
2002-09-22 04:45:21 +00:00
bde
73b1dab77a Fixed some style bugs in the removal of __P(()). The main ones were
not removing tabs before "__P((", and not outdenting continuation lines
to preserve non-KNF lining up of code with parentheses.  Switch to KNF
formatting and/or rewrap the whole prototype in some cases.
2002-03-23 15:09:35 +00:00
alfred
61bf661405 Remove __P. 2002-03-20 05:48:58 +00:00
jhb
22c01df0b4 Add a missing open paren to a macro that's been broken (and apparently
unused) since rev 1.1 so it is at least correct.

Submitted by:	Maxime Henrion <mux@qualys.com>
2001-12-04 00:35:28 +00:00
bde
0409d20c48 Declare or #define per-cpu globals in <machine/globals.h> in all cases.
The i386 UP case was messily different.
2000-10-27 08:30:59 +00:00
jhb
e638f1a098 currentldt is now a "special" global-data variable, and as such, there
is no actual currentldt integer variable directly.  Thus, don't claim that
there is.
2000-10-06 01:59:07 +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
peter
3b842d34e8 $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
msmith
da44a32897 Mindbogglingly, many BIOS vendors expect to be able to load %ds with
0x40 and then access data stored in real-mode segment 0x40, even when
called in protected mode.  Microsoft unfortunately coddle these individuals,
and so must we if we want to run their code.

This change works around GPFs in some APM and PnP BIOS implementations.

Obtained from:	Linux
1999-08-17 07:09:13 +00:00
msmith
e495b00d19 Major update to the kernel's BIOS-calling ability.
- Add support for calling 32-bit code in other segments
 - Add support for calling 16-bit protected mode code

Update APM to use this facility.

Submitted by:	jlemon
1999-07-29 01:49:19 +00:00
bde
72f8c1311e Changed the global `idt' from an array to a pointer so that npx.c
automatically hacks on the active copy of the IDT if f00f_hack()
has changed it.  This also allows simplifications in setidt().
This fixes breakage of FP exception handling by rev.1.55 of
sys/kernel.h.  FP exceptions were sent to npx.c's probe handlers
because npx.c "restored" the old handlers to the wrong copy of the
IDT.  The SYSINIT for f00f_hack() was purposely run quite late to
avoid problems like this, but it is bogusly associated with the
SYSINIT for proc0 so it was moved with the latter.

Problem reported and fix tested by:  Martin Cracauer <cracauer@cons.org>
1999-06-18 14:32:21 +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
newton
4532b2c24c Sun Bug ID 1251858 (on http://sunsolve1.sun.com) discusses the way that
Sun implemented iBCS2 compatibility on Solaris >= 2.6:  The emulator
runs in user-mode, patching the LDT so that client programs making
syscalls through the old iBCS2 call gate get handled by the emulator
process.  Unemulated syscalls therefore need their own call-gate that
bypasses the emulator.  Sun chose LDT entry 4 to implement this, which
is what we've been using as LUDATA_SEL, so we need to change LUDATA_SEL
if we want to run Solaris executables.

Discussed with: Mike Smith
1999-01-28 11:45:49 +00:00
charnier
ec0491b457 Revert my previous commit about using CS_SECURE macro.
Requested by:	Bruce.
1997-08-21 06:33:04 +00:00
charnier
e0224667fe Use CS_SECURE macro.
Reviewed by:	John Dyson
1997-08-18 06:58:59 +00:00
fsmp
95214909a0 Increased NIDT to 256 for case of SMP or APIC_IO. 1997-07-19 02:24:37 +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
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
peter
9a03ada005 Apparently, BSDI have a new system call gate. I was experimenting
with this quite a while ago when somebody reported a BSD/OS 2.1 binary
that wouldn't run.  I'm pretty sure they tried it and I'm pretty sure
they mentioned to me that the patch worked.
1996-09-27 13:33:49 +00:00
mpp
f3dd75a38d Fix a bunch of spelling errors in the comment fields of
a bunch of system include files.
1996-01-30 23:02:38 +00:00
rgrimes
c86f0c7a71 Remove trailing whitespace. 1995-05-30 08:16:23 +00:00
sos
6deee3a45e First attempt to run linux binaries. This is only the changes needed to
the generic kernel. The actual emulator is a separate LKM. (not finished
yet, sorry).
Submitted by:	sos@freebsd.org & sef@kithrup.com
1995-02-14 19:23:22 +00:00
bde
a7e2537b02 Make gdt_segs[] public again for APM.
Make ldt[] public again and restore currentldt and _default_ldt for
USER_LDT.
1994-11-15 14:12:55 +00:00
bde
03c6bfcbf9 Remove 1.5+K of bloat for unused idt entries.
Partly support BDE_DEBUGGER.  Still broken by conflict with APM.  Does
nothing if BDE_DEBUGGER is not defined.

Clean up prototypes and data declarations.  Declare most of the segment
functions that are implemented in support.s.  Make data private in
machdep.c if possible.

Parenthesize expressions in macros properly!

${Uniformize idempotency ifdef}.
1994-11-14 14:18:15 +00:00
dg
b329c83425 Laptop Advanced Power Management support by HOSOKAWA Tatsumi.
Submitted by:	HOSOKAWA Tatsumi
1994-10-01 02:56:21 +00:00
dg
8df5d2c1f8 WINE/user LDT support from John Brezak, ported to FreeBSD by Jeffrey Hsu
<hsu@soda.berkeley.edu>.
1994-01-31 10:27:13 +00:00
wollman
371ee40cea Made all header files idempotent and moved incorrect common data from
headers into a related source file.  Added cons.h as first step towards
moving i386/i386/cons.h to machine/cons.h where it belongs.
1993-11-07 17:43:17 +00:00
rgrimes
721e412d5e Removed all patch kit headers, sccsid and rcsid strings, put $Id$ in, some
minor cleanup.  Added $Id$ to files that did not have any version info, etc
1993-10-16 14:40:57 +00:00
rgrimes
25062ba061 Initial import, 0.1 + pk 0.2.4-B1 1993-06-12 14:58:17 +00:00