system/freebsd-src
system/freebsd-src
1
0
Fork 0
mirror of https://github.com/freebsd/freebsd-src synced 2024-11-05 18:22:52 +00:00
Code Issues Projects Releases Packages Wiki Activity

Merge from DRI CVS: Disable MTRRs on FreeBSD-stable to work around hangs with

Browse source 
SMP machines. and use i386 asm for atomic_cmpset_int on -stable.  This is in
preparation for MFCing the DRM.
This commit is contained in:
Eric Anholt 2003-04-26 06:59:38 +00:00
parent 155080d31e
commit d2c47a2151
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=114054
1 changed files with 17 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

27
sys/dev/drm/drm_os_freebsd.h
View file

@ -49,7 +49,7 @@
#endif
#ifdef __i386__
#define __REALLY_HAVE_MTRR (__HAVE_MTRR)
#define __REALLY_HAVE_MTRR (__HAVE_MTRR) && (__FreeBSD_version >= 500000)
#else
#define __REALLY_HAVE_MTRR 0
#endif
@ -249,16 +249,23 @@ typedef u_int8_t u8;
#if __FreeBSD_version < 500000
/* The extra atomic functions from 5.0 haven't been merged to 4.x */
static __inline int
atomic_cmpset_int(volatile int *dst, int old, int new)
atomic_cmpset_int(volatile u_int *dst, u_int exp, u_int src)
{
int s = splhigh();
if (*dst==old) {
*dst = new;
splx(s);
return 1;
}
splx(s);
return 0;
int res = exp;
__asm __volatile (
" lock ; "
" cmpxchgl %1,%2 ; "
" setz %%al ; "
" movzbl %%al,%0 ; "
"1: "
"# atomic_cmpset_int"
: "+a" (res) /* 0 (result) */
: "r" (src), /* 1 */
"m" (*(dst)) /* 2 */
: "memory");
return (res);
}
#endif