- All the functions in atomic.h needs to be in "physical" form (like

not defined through macros or similar) in order to be later compiled in
  the kernel and offer this way the support for modules (and
  compatibility among the UP case and SMP case).
  Fix this for the newly introduced atomic_cmpset_barr_* cases by defining
  and specifying a template.  Note that the new DEFINE_CMPSET_GEN()
  template save more typing on amd64 than the current code. [1]
- Fix the style for memory barriers on amd64.

[1] Reported by:	Paul B. Mahol <onemda at gmail dot com>
This commit is contained in:
Attilio Rao 2009-10-06 23:48:28 +00:00
parent 640b70e414
commit d9492a4483
2 changed files with 79 additions and 91 deletions

View File

@ -32,9 +32,9 @@
#error this file needs sys/cdefs.h as a prerequisite
#endif
#define mb() __asm__ __volatile__ ("mfence;": : :"memory")
#define wmb() __asm__ __volatile__ ("sfence;": : :"memory")
#define rmb() __asm__ __volatile__ ("lfence;": : :"memory")
#define mb() __asm __volatile("mfence;" : : : "memory")
#define wmb() __asm __volatile("sfence;" : : : "memory")
#define rmb() __asm __volatile("lfence;" : : : "memory")
/*
* Various simple operations on memory, each of which is atomic in the
@ -131,50 +131,33 @@ struct __hack
* Returns 0 on failure, non-zero on success
*/
static __inline int
atomic_cmpset_int(volatile u_int *dst, u_int exp, u_int src)
{
u_char res;
#define DEFINE_CMPSET_GEN(NAME, TYPE, OP) \
static __inline int \
atomic_cmpset_##NAME(volatile u_##TYPE *dst, u_##TYPE exp, u_##TYPE src)\
{ \
u_char res; \
\
__asm __volatile( \
" " MPLOCKED " " \
" " OP " %2,%1 ; " \
" sete %0 ; " \
"1: " \
"# atomic_cmpset_##NAME" \
: "=a" (res), /* 0 */ \
"=m" (*dst) /* 1 */ \
: "r" (src), /* 2 */ \
"a" (exp), /* 3 */ \
"m" (*dst) /* 4 */ \
: "memory"); \
\
return (res); \
} \
struct __hack
__asm __volatile(
" " MPLOCKED " "
" cmpxchgl %2,%1 ; "
" sete %0 ; "
"1: "
"# atomic_cmpset_int"
: "=a" (res), /* 0 */
"=m" (*dst) /* 1 */
: "r" (src), /* 2 */
"a" (exp), /* 3 */
"m" (*dst) /* 4 */
: "memory");
return (res);
}
static __inline int
atomic_cmpset_long(volatile u_long *dst, u_long exp, u_long src)
{
u_char res;
__asm __volatile(
" " MPLOCKED " "
" cmpxchgq %2,%1 ; "
" sete %0 ; "
"1: "
"# atomic_cmpset_long"
: "=a" (res), /* 0 */
"=m" (*dst) /* 1 */
: "r" (src), /* 2 */
"a" (exp), /* 3 */
"m" (*dst) /* 4 */
: "memory");
return (res);
}
#define atomic_cmpset_barr_int atomic_cmpset_int
#define atomic_cmpset_barr_long atomic_cmpset_long
DEFINE_CMPSET_GEN(int, int, "cmpxchgl");
DEFINE_CMPSET_GEN(long, long, "cmpxchgq");
DEFINE_CMPSET_GEN(barr_int, int, "cmpxchgl");
DEFINE_CMPSET_GEN(barr_long, long, "cmpxchgq");
/*
* Atomically add the value of v to the integer pointed to by p and return

View File

@ -130,57 +130,62 @@ struct __hack
#ifdef CPU_DISABLE_CMPXCHG
static __inline int
atomic_cmpset_int(volatile u_int *dst, u_int exp, u_int src)
{
u_char res;
__asm __volatile(
" pushfl ; "
" cli ; "
" cmpl %3,%4 ; "
" jne 1f ; "
" movl %2,%1 ; "
"1: "
" sete %0 ; "
" popfl ; "
"# atomic_cmpset_int"
: "=q" (res), /* 0 */
"=m" (*dst) /* 1 */
: "r" (src), /* 2 */
"r" (exp), /* 3 */
"m" (*dst) /* 4 */
: "memory");
return (res);
}
#define DEFINE_CMPSET_GEN(NAME) \
static __inline int \
atomic_cmpset_##NAME(volatile u_int *dst, u_int exp, u_int src)\
{ \
u_char res; \
\
__asm __volatile( \
" pushfl ; " \
" cli ; " \
" cmpl %3,%4 ; " \
" jne 1f ; " \
" movl %2,%1 ; " \
"1: " \
" sete %0 ; " \
" popfl ; " \
"# atomic_cmpset_##NAME" \
: "=q" (res), /* 0 */ \
"=m" (*dst) /* 1 */ \
: "r" (src), /* 2 */ \
"r" (exp), /* 3 */ \
"m" (*dst) /* 4 */ \
: "memory"); \
\
return (res); \
} \
struct __hack
#else /* !CPU_DISABLE_CMPXCHG */
static __inline int
atomic_cmpset_int(volatile u_int *dst, u_int exp, u_int src)
{
u_char res;
__asm __volatile(
" " MPLOCKED " "
" cmpxchgl %2,%1 ; "
" sete %0 ; "
"1: "
"# atomic_cmpset_int"
: "=a" (res), /* 0 */
"=m" (*dst) /* 1 */
: "r" (src), /* 2 */
"a" (exp), /* 3 */
"m" (*dst) /* 4 */
: "memory");
return (res);
}
#define DEFINE_CMPSET_GEN(NAME) \
static __inline int \
atomic_cmpset_##NAME(volatile u_int *dst, u_int exp, u_int src)\
{ \
u_char res; \
\
__asm __volatile( \
" " MPLOCKED " " \
" cmpxchgl %2,%1 ; " \
" sete %0 ; " \
"1: " \
"# atomic_cmpset_##NAME" \
: "=a" (res), /* 0 */ \
"=m" (*dst) /* 1 */ \
: "r" (src), /* 2 */ \
"a" (exp), /* 3 */ \
"m" (*dst) /* 4 */ \
: "memory"); \
\
return (res); \
} \
struct __hack
#endif /* CPU_DISABLE_CMPXCHG */
#define atomic_cmpset_barr_int atomic_cmpset_int
DEFINE_CMPSET_GEN(int);
DEFINE_CMPSET_GEN(barr_int);
/*
* Atomically add the value of v to the integer pointed to by p and return