1 /* $NetBSD: lwp_private.h,v 1.1 2024/11/30 01:04:11 christos Exp $ */
2
3 /*-
4 * Copyright (c) 1999, 2002 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Klaus Klein, and by Jason R. Thorpe of Wasabi Systems, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #ifndef _MIPS_LWP_PRIVATE_H_
33 #define _MIPS_LWP_PRIVATE_H_
34
35 #include <lwp.h>
36 #include <sys/cdefs.h>
37 #include <sys/tls.h>
38
39 #define TLS_TP_OFFSET 0x7000
40 #define TLS_DTV_OFFSET 0x8000
41
42 __CTASSERT(TLS_TP_OFFSET + sizeof(struct tls_tcb) < 0x8000);
43 __CTASSERT(TLS_TP_OFFSET % sizeof(struct tls_tcb) == 0);
44
45 __BEGIN_DECLS
46
47 static __inline struct tls_tcb *
__lwp_gettcb_fast(void)48 __lwp_gettcb_fast(void)
49 {
50 struct tls_tcb *__tcb;
51
52 /*
53 * Only emit a rdhwr $3, $29 so the kernel can quickly emulate it.
54 */
55 __asm __volatile(
56 #if 1
57 // For some reason the syscall is much faster than
58 // emulating rdhwr $3,$29 on a CN50xx
59 "addiu $2,$0,316; syscall; nop; move %[__tcb],$2"
60 #else
61 ".set push"
62 ";.set mips32r2"
63 ";.p2align 4"
64 ";ssnop"
65 ";rdhwr $3,$29"
66 ";ssnop"
67 ";move %0,$3"
68 ";.set pop"
69 #endif
70 : [__tcb]"=r"(__tcb)
71 :
72 : "v0", "v1", "a3");
73 return __tcb - (TLS_TP_OFFSET / sizeof(*__tcb) + 1);
74 }
75
76 void _lwp_setprivate(void *);
77
78 static inline void
__lwp_settcb(struct tls_tcb * __tcb)79 __lwp_settcb(struct tls_tcb *__tcb)
80 {
81 __tcb += TLS_TP_OFFSET / sizeof(*__tcb) + 1;
82 _lwp_setprivate(__tcb);
83 }
84
85 __END_DECLS
86
87 #endif /* _MIPS_LWP_PRIVATE_H_ */
88