X-Git-Url: http://git.liburcu.org/?p=userspace-rcu.git;a=blobdiff_plain;f=include%2Furcu%2Farch%2Fx86.h;fp=include%2Furcu%2Farch%2Fx86.h;h=aac8ca1384b63f4ce321680cffbcaca661a0f16c;hp=0000000000000000000000000000000000000000;hb=6893800a4d1cc14dff0395ddcd660a5138db183d;hpb=a59f39055b5ecb77b68cf78b9839aa9e8e4ec332

diff --git a/include/urcu/arch/x86.h b/include/urcu/arch/x86.h
new file mode 100644
index 0000000..aac8ca1
--- /dev/null
+++ b/include/urcu/arch/x86.h
@@ -0,0 +1,111 @@
+#ifndef _URCU_ARCH_X86_H
+#define _URCU_ARCH_X86_H
+
+/*
+ * arch_x86.h: trivial definitions for the x86 architecture.
+ *
+ * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * 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
+ * Lesser General Public License for more details.
+ *
+ * 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 <urcu/compiler.h>
+#include <urcu/config.h>
+#include <urcu/syscall-compat.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define CAA_CACHE_LINE_SIZE	128
+
+#ifdef CONFIG_RCU_HAVE_FENCE
+#define cmm_mb()    __asm__ __volatile__ ("mfence":::"memory")
+
+/*
+ * Define cmm_rmb/cmm_wmb to "strict" barriers that may be needed when
+ * using SSE or working with I/O areas.  cmm_smp_rmb/cmm_smp_wmb are
+ * only compiler barriers, which is enough for general use.
+ */
+#define cmm_rmb()     __asm__ __volatile__ ("lfence":::"memory")
+#define cmm_wmb()     __asm__ __volatile__ ("sfence"::: "memory")
+#define cmm_smp_rmb() cmm_barrier()
+#define cmm_smp_wmb() cmm_barrier()
+#else
+/*
+ * We leave smp_rmb/smp_wmb as full barriers for processors that do not have
+ * fence instructions.
+ *
+ * An empty cmm_smp_rmb() may not be enough on old PentiumPro multiprocessor
+ * systems, due to an erratum.  The Linux kernel says that "Even distro
+ * kernels should think twice before enabling this", but for now let's
+ * be conservative and leave the full barrier on 32-bit processors.  Also,
+ * IDT WinChip supports weak store ordering, and the kernel may enable it
+ * under our feet; cmm_smp_wmb() ceases to be a nop for these processors.
+ */
+#if (CAA_BITS_PER_LONG == 32)
+#define cmm_mb()    __asm__ __volatile__ ("lock; addl $0,0(%%esp)":::"memory")
+#define cmm_rmb()    __asm__ __volatile__ ("lock; addl $0,0(%%esp)":::"memory")
+#define cmm_wmb()    __asm__ __volatile__ ("lock; addl $0,0(%%esp)":::"memory")
+#else
+#define cmm_mb()    __asm__ __volatile__ ("lock; addl $0,0(%%rsp)":::"memory")
+#define cmm_rmb()    __asm__ __volatile__ ("lock; addl $0,0(%%rsp)":::"memory")
+#define cmm_wmb()    __asm__ __volatile__ ("lock; addl $0,0(%%rsp)":::"memory")
+#endif
+#endif
+
+#define caa_cpu_relax()	__asm__ __volatile__ ("rep; nop" : : : "memory")
+
+#define HAS_CAA_GET_CYCLES
+
+#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 uint64_t caa_cycles_t;
+
+static inline caa_cycles_t caa_get_cycles(void)
+{
+        caa_cycles_t ret = 0;
+
+        rdtscll(ret);
+        return ret;
+}
+
+/*
+ * On Linux, define the membarrier system call number if not yet available in
+ * the system headers.
+ */
+#if (defined(__linux__) && !defined(__NR_membarrier))
+#if (CAA_BITS_PER_LONG == 32)
+#define __NR_membarrier		375
+#else
+#define __NR_membarrier		324
+#endif
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#include <urcu/arch/generic.h>
+
+#endif /* _URCU_ARCH_X86_H */