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Replace the C atomic_cmpset_int compatibility function for -stable with the 

real i386 atomic_cmpset_int from -current. FreeBSD-stable won't ever
    have DRM support for non-i386.
main
Eric Anholt 2003-04-26 06:53:22 +00:00
parent acb5d6b273
commit e60eb69bc0
2 changed files with 32 additions and 18 deletions
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25
bsd-core/drm_os_freebsd.h
View File

@ -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

25
bsd/drm_os_freebsd.h
View File

@ -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