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Loader tunable 'machdep.disable_mtrrs'.

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Sysctl of same name to reflect status.

Submitted by:	 jhb
Approved by:	 re (murray)
MFC after:	 1 day
This commit is contained in:
Matthew N. Dodd 2002-11-13 09:37:43 +00:00
parent df81b3e662
commit d7545b110c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=106842
4 changed files with 20 additions and 2 deletions
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8
sys/amd64/amd64/amd64_mem.c
View File

@ -32,6 +32,7 @@
#include <sys/malloc.h>
#include <sys/memrange.h>
#include <sys/smp.h>
#include <sys/sysctl.h>
#include <machine/md_var.h>
#include <machine/specialreg.h>
@ -60,6 +61,11 @@ static char *mem_owner_bios = "BIOS";
#define mrcopyflags(curr, new) (((curr) & ~MDF_ATTRMASK) | ((new) & MDF_ATTRMASK))
static int mtrrs_disabled;
TUNABLE_INT("machdep.disable_mtrrs", &mtrrs_disabled);
SYSCTL_INT(_machdep, OID_AUTO, disable_mtrrs, CTLFLAG_RD,
&mtrrs_disabled, 0, "Disable i686 MTRRs.");
static void i686_mrinit(struct mem_range_softc *sc);
static int i686_mrset(struct mem_range_softc *sc,
struct mem_range_desc *mrd,
@ -601,7 +607,7 @@ static void
i686_mem_drvinit(void *unused)
{
/* Try for i686 MTRRs */
if ((cpu_feature & CPUID_MTRR) &&
if (!mtrrs_disabled && (cpu_feature & CPUID_MTRR) &&
((cpu_id & 0xf00) == 0x600 || (cpu_id & 0xf00) == 0xf00) &&
((strcmp(cpu_vendor, "GenuineIntel") == 0) ||
(strcmp(cpu_vendor, "AuthenticAMD") == 0))) {

4
sys/boot/common/help.common
View File

@ -256,6 +256,10 @@
Disable the use of the PCI BIOS (i386 only)
set machdep.disable_mtrrs=1
Disable the use of i686 MTRRs (i386 only)
set net.inet.tcp.tcbhashsize=<value> TCBHASHSIZE
Overrides the compile-time set value of TCBHASHSIZE or

2
sys/boot/common/loader.8
View File

@ -476,6 +476,8 @@ Note that
the NBUF parameter will override this limit.
Modifies
.Va VM_BCACHE_SIZE_MAX .
.It Va machdep.disable_mtrrs
Disable the use of i686 MTRRs (x86 only).
.It Va machdep.pccard.pcic_irq
Overrides the IRQ normally assigned to a PCCARD controller.
Typically the first available interrupt will be allocated,

8
sys/i386/i386/i686_mem.c
View File

@ -32,6 +32,7 @@
#include <sys/malloc.h>
#include <sys/memrange.h>
#include <sys/smp.h>
#include <sys/sysctl.h>
#include <machine/md_var.h>
#include <machine/specialreg.h>
@ -60,6 +61,11 @@ static char *mem_owner_bios = "BIOS";
#define mrcopyflags(curr, new) (((curr) & ~MDF_ATTRMASK) | ((new) & MDF_ATTRMASK))
static int mtrrs_disabled;
TUNABLE_INT("machdep.disable_mtrrs", &mtrrs_disabled);
SYSCTL_INT(_machdep, OID_AUTO, disable_mtrrs, CTLFLAG_RD,
&mtrrs_disabled, 0, "Disable i686 MTRRs.");
static void i686_mrinit(struct mem_range_softc *sc);
static int i686_mrset(struct mem_range_softc *sc,
struct mem_range_desc *mrd,
@ -601,7 +607,7 @@ static void
i686_mem_drvinit(void *unused)
{
/* Try for i686 MTRRs */
if ((cpu_feature & CPUID_MTRR) &&
if (!mtrrs_disabled && (cpu_feature & CPUID_MTRR) &&
((cpu_id & 0xf00) == 0x600 || (cpu_id & 0xf00) == 0xf00) &&
((strcmp(cpu_vendor, "GenuineIntel") == 0) ||
(strcmp(cpu_vendor, "AuthenticAMD") == 0))) {