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Only read the cr4 register if the cpu_feature flag indicates the machine

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has VME support.

Noticed by: kato
This commit is contained in:
Jonathan Lemon 1998-03-24 16:47:12 +00:00
parent e4c06e4e91
commit eefbfc25cb
1 changed files with 3 additions and 2 deletions
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5
sys/i386/i386/vm86.c
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@ -23,7 +23,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: vm86.c,v 1.9 1998/03/23 19:52:38 jlemon Exp $
* $Id: vm86.c,v 1.10 1998/03/24 08:29:05 kato Exp $
*/
#include "opt_vm86.h"
@ -418,7 +418,8 @@ vm86_initialize(void)
ext->ext_iomap = (caddr_t)(offset + ((u_int)&ext->ext_tss & PG_FRAME));
ext->ext_vm86.vm86_intmap = ext->ext_iomap - 32;
ext->ext_vm86.vm86_has_vme = (rcr4() & CR4_VME ? 1 : 0);
if (cpu_feature & CPUID_VME)
ext->ext_vm86.vm86_has_vme = (rcr4() & CR4_VME ? 1 : 0);
addr = (u_long *)ext->ext_vm86.vm86_intmap;
for (i = 0; i < (ctob(IOPAGES) + 32 + 16) / sizeof(u_long); i++)