rte_rtm.h revision 9ca4a157
1#ifndef _RTE_RTM_H_
2#define _RTE_RTM_H_ 1
3
4/*
5 * Copyright (c) 2012,2013 Intel Corporation
6 * Author: Andi Kleen
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that: (1) source code distributions
10 * retain the above copyright notice and this paragraph in its entirety, (2)
11 * distributions including binary code include the above copyright notice and
12 * this paragraph in its entirety in the documentation or other materials
13 * provided with the distribution
14 *
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
16 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
17 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18 */
19
20/* Official RTM intrinsics interface matching gcc/icc, but works
21   on older gcc compatible compilers and binutils. */
22
23#include <rte_common.h>
24
25#ifdef __cplusplus
26extern "C" {
27#endif
28
29
30#define RTE_XBEGIN_STARTED		(~0u)
31#define RTE_XABORT_EXPLICIT		(1 << 0)
32#define RTE_XABORT_RETRY		(1 << 1)
33#define RTE_XABORT_CONFLICT		(1 << 2)
34#define RTE_XABORT_CAPACITY		(1 << 3)
35#define RTE_XABORT_DEBUG		(1 << 4)
36#define RTE_XABORT_NESTED		(1 << 5)
37#define RTE_XABORT_CODE(x)		(((x) >> 24) & 0xff)
38
39static __attribute__((__always_inline__)) inline
40unsigned int rte_xbegin(void)
41{
42	unsigned int ret = RTE_XBEGIN_STARTED;
43
44	asm volatile(".byte 0xc7,0xf8 ; .long 0" : "+a" (ret) :: "memory");
45	return ret;
46}
47
48static __attribute__((__always_inline__)) inline
49void rte_xend(void)
50{
51	 asm volatile(".byte 0x0f,0x01,0xd5" ::: "memory");
52}
53
54/* not an inline function to workaround a clang bug with -O0 */
55#define rte_xabort(status) do { \
56	asm volatile(".byte 0xc6,0xf8,%P0" :: "i" (status) : "memory"); \
57} while (0)
58
59static __attribute__((__always_inline__)) inline
60int rte_xtest(void)
61{
62	unsigned char out;
63
64	asm volatile(".byte 0x0f,0x01,0xd6 ; setnz %0" :
65		"=r" (out) :: "memory");
66	return out;
67}
68
69#ifdef __cplusplus
70}
71#endif
72
73#endif /* _RTE_RTM_H_ */
74