Free TSS on the stack of the dead process.

In order to do that we have to remove all sleeping parts: sleeping
memory allocation and a sleeping lock.  Thus we're moving this code
to the spinning lock (mutex) and getting rid of the GDT grow code.
Downside is that now we're pre-allocating 64kb of memory per CPU
from the start, but this might be optimized in future.

This also unifies GDT code and MAXGDTSIZ define across i386 and amd64.

With help from mickey.

ok toby, art

1 files changed, 5 insertions, 3 deletions

diff --git a/sys/arch/amd64/include/gdt.h b/sys/arch/amd64/include/gdt.h
index 3b4abd01071..b52bc98e3eb 100644
--- a/sys/arch/amd64/include/gdt.h
+++ b/sys/arch/amd64/include/gdt.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: gdt.h,v 1.3 2008/06/26 05:42:09 ray Exp $	*/
+/*	$OpenBSD: gdt.h,v 1.4 2009/02/03 11:24:19 mikeb Exp $	*/
 /*	$NetBSD: gdt.h,v 1.1 2003/04/26 18:39:40 fvdl Exp $	*/
 
 /*-
@@ -51,6 +51,8 @@ void set_sys_gdt(struct sys_segment_descriptor *, void *, size_t, int, int,
 		 int);
 #endif
 
-/* MINGDTSIZ must be a multiple of PAGE_SIZE or gdt_grow breaks */
-#define MINGDTSIZ       PAGE_SIZE
+/*
+ * Maximum GDT size.  It cannot exceed 65536 since the selector field of
+ * a descriptor is just 16 bits, and used as free list link.
+ */
 #define MAXGDTSIZ       65536