#define _ARCH_X86_H
/*
- * arch_x86.h: Definitions for the x86 architecture, derived from Linux.
+ * arch_x86.h: trivial definitions for the x86 architecture.
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; but only version 2 of the License given
- * that this comes from the Linux kernel.
+ * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
*
- * This program is distributed in the hope that it will be useful,
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+*
+ * This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
*
- * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <compiler.h>
+#include <arch_atomic.h>
/* Assume P4 or newer */
#define CONFIG_HAVE_FENCE 1
#define CONFIG_HAVE_MEM_COHERENCY
+#ifndef BITS_PER_LONG
+#define BITS_PER_LONG (__SIZEOF_LONG__ * 8)
+#endif
+
#ifdef CONFIG_HAVE_FENCE
#define mb() asm volatile("mfence":::"memory")
#define rmb() asm volatile("lfence":::"memory")
/* Nop everywhere except on alpha. */
#define smp_read_barrier_depends()
-/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
static inline void rep_nop(void)
{
- asm volatile("rep; nop" ::: "memory");
+ asm volatile("rep; nop" : : : "memory");
}
static inline void cpu_relax(void)
rep_nop();
}
-#ifndef _INCLUDE_API_H
-
-static inline void atomic_inc(int *v)
-{
- asm volatile("lock; incl %0"
- : "+m" (*v));
-}
-
-#endif /* #ifndef _INCLUDE_API_H */
-
-#define xchg(ptr, v) \
- ((__typeof__(*(ptr)))__xchg((unsigned long)(v), (ptr), sizeof(*(ptr))))
-
-struct __xchg_dummy {
- unsigned long a[100];
-};
-#define __xg(x) ((struct __xchg_dummy *)(x))
-
/*
- * Note: no "lock" prefix even on SMP: xchg always implies lock anyway
- * Note 2: xchg has side effect, so that attribute volatile is necessary,
- * but generally the primitive is invalid, *ptr is output argument. --ANK
- * x is considered local, ptr is considered remote.
+ * Serialize core instruction execution. Also acts as a compiler barrier.
*/
-static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
- int size)
+#ifdef __PIC__
+/*
+ * Cannot use cpuid because it clobbers the ebx register and clashes
+ * with -fPIC :
+ * error: PIC register 'ebx' clobbered in 'asm'
+ */
+static inline void sync_core(void)
{
- switch (size) {
- case 1:
- asm volatile("xchgb %b0,%1"
- : "=q" (x)
- : "m" (*__xg(ptr)), "0" (x)
- : "memory");
- break;
- case 2:
- asm volatile("xchgw %w0,%1"
- : "=r" (x)
- : "m" (*__xg(ptr)), "0" (x)
- : "memory");
- break;
- case 4:
- asm volatile("xchgl %k0,%1"
- : "=r" (x)
- : "m" (*__xg(ptr)), "0" (x)
- : "memory");
- break;
- case 8:
- asm volatile("xchgq %0,%1"
- : "=r" (x)
- : "m" (*__xg(ptr)), "0" (x)
- : "memory");
- break;
- }
- smp_wmc();
- return x;
+ mb();
}
+#else
+static inline void sync_core(void)
+{
+ asm volatile("cpuid" : : : "memory", "eax", "ebx", "ecx", "edx");
+}
+#endif
-
-#define rdtscll(val) do { \
- unsigned int __a,__d; \
- asm volatile("rdtsc" : "=a" (__a), "=d" (__d)); \
- (val) = ((unsigned long long)__a) | (((unsigned long long)__d)<<32); \
-} while(0)
+#define rdtscll(val) \
+ do { \
+ unsigned int __a, __d; \
+ asm volatile("rdtsc" : "=a" (__a), "=d" (__d)); \
+ (val) = ((unsigned long long)__a) \
+ | (((unsigned long long)__d) << 32); \
+ } while(0)
typedef unsigned long long cycles_t;
-static inline cycles_t get_cycles (void)
+static inline cycles_t get_cycles(void)
{
- unsigned long long ret = 0;
+ cycles_t ret = 0;
rdtscll(ret);
return ret;
projects / urcu.git / blobdiff