d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Make the length of the LDT a loader tunable, machdep.max_ldt_segment,

Browse Source 
and export it with read-only sysctl. Remove unused defines.

Reviewed by:	jhb (previous version)
MFC after:	1 week
This commit is contained in:
kib 2011-01-18 23:00:22 +00:00
parent 84be5407e5
commit 574efcb295
1 changed files with 18 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
sys/amd64/amd64/sys_machdep.c
View File

@ -35,6 +35,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
@ -58,9 +59,24 @@ __FBSDID("$FreeBSD$");
#include <security/audit/audit.h>
#define MAX_LD 8192
int max_ldt_segment = 1024;
#define LD_PER_PAGE 512
#define NULL_LDT_BASE ((caddr_t)NULL)
SYSCTL_INT(_machdep, OID_AUTO, max_ldt_segment, CTLFLAG_RD, &max_ldt_segment,
0,
"Maximum number of allowed LDT segments in the single address space");
static void
max_ldt_segment_init(void *arg __unused)
{
TUNABLE_INT_FETCH("machdep.max_ldt_segment", &max_ldt_segment);
if (max_ldt_segment <= 0)
max_ldt_segment = 1;
if (max_ldt_segment > MAX_LD)
max_ldt_segment = MAX_LD;
}
SYSINIT(maxldt, SI_SUB_VM_CONF, SI_ORDER_ANY, max_ldt_segment_init, NULL);
#ifdef notyet
#ifdef SMP