ppc.h: use mftb on ppc
[urcu.git] / include / urcu / arch / arm.h
1 // SPDX-FileCopyrightText: 2010 Paul E. McKenney, IBM Corporation.
2 // SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
3 //
4 // SPDX-License-Identifier: LGPL-2.1-or-later
5
6 #ifndef _URCU_ARCH_ARM_H
7 #define _URCU_ARCH_ARM_H
8
9 /*
10 * arch_arm.h: trivial definitions for the ARM architecture.
11 */
12
13 #include <urcu/compiler.h>
14 #include <urcu/config.h>
15 #include <urcu/syscall-compat.h>
16
17 #ifdef __cplusplus
18 extern "C" {
19 #endif
20
21 /*
22 * Using DMB is faster than the builtin __sync_synchronize and this instruction is
23 * part of the baseline ARMv7 ISA.
24 */
25 #ifdef URCU_ARCH_ARMV7
26
27 /* For backwards compat. */
28 #define CONFIG_RCU_ARM_HAVE_DMB 1
29
30 /*
31 * Issues full system DMB operation.
32 */
33 #define cmm_mb() __asm__ __volatile__ ("dmb sy":::"memory")
34 #define cmm_rmb() __asm__ __volatile__ ("dmb sy":::"memory")
35 #define cmm_wmb() __asm__ __volatile__ ("dmb sy":::"memory")
36
37 /*
38 * Issues DMB operation only to the inner shareable domain.
39 */
40 #define cmm_smp_mb() __asm__ __volatile__ ("dmb ish":::"memory")
41 #define cmm_smp_rmb() __asm__ __volatile__ ("dmb ish":::"memory")
42 #define cmm_smp_wmb() __asm__ __volatile__ ("dmb ish":::"memory")
43
44 #endif /* URCU_ARCH_ARMV7 */
45
46 #include <stdlib.h>
47 #include <sys/time.h>
48
49 /*
50 * On Linux, define the membarrier system call number if not yet available in
51 * the system headers.
52 */
53 #if (defined(__linux__) && !defined(__NR_membarrier))
54 #define __NR_membarrier 389
55 #endif
56
57 /*
58 * Error out for compilers with known bugs.
59 */
60
61 /*
62 * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58854
63 */
64 #ifdef URCU_GCC_VERSION
65 # if URCU_GCC_VERSION >= 40800 && URCU_GCC_VERSION <= 40802
66 # error Your gcc version produces clobbered frame accesses
67 # endif
68 #endif
69
70 /*
71 * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42263
72 */
73 #ifdef URCU_GCC_VERSION
74 # if URCU_GCC_VERSION >= 40400 && URCU_GCC_VERSION <= 40402
75 # error Your gcc version has a non-functional __sync_synchronize()
76 # endif
77 #endif
78
79 #ifdef __cplusplus
80 }
81 #endif
82
83 #include <urcu/arch/generic.h>
84
85 #endif /* _URCU_ARCH_ARM_H */
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