1/* $OpenBSD: tcb.h,v 1.4 2017/04/20 16:07:52 visa Exp $ */
2
3/*
4 * Copyright (c) 2011 Philip Guenther <guenther@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#ifndef _MACHINE_TCB_H_
20#define _MACHINE_TCB_H_
21
22#ifdef _KERNEL
23
24static inline void
25__mips64_set_tcb(struct proc *p, void *tcb)
26{
27#ifdef CPU_MIPS64R2
28 extern int cpu_has_userlocal;
29
30 if (cpu_has_userlocal)
31 cp0_set_userlocal(tcb);
32#endif
33
34 p->p_md.md_tcb = tcb;
35}
36
37#define TCB_SET(p, addr) __mips64_set_tcb(p, addr)
38#define TCB_GET(p) ((p)->p_md.md_tcb)
39
40#else /* _KERNEL */
41
42/* ELF TLS ABI calls for small TCB, with static TLS data after it */
43#define TLS_VARIANT 1
44
45static inline void *
46__mips64_get_tcb(void)
47{
48 void *tcb;
49
50 /*
51 * This invokes emulation in kernel if the system does not implement
52 * the RDHWR instruction or the UserLocal register.
53 */
54 __asm__ volatile (
55 " .set push\n"
56 " .set mips64r2\n"
57 " rdhwr %0, $29\n"
58 " .set pop\n" : "=r" (tcb));
59 return tcb;
60}
61
62#define TCB_GET() __mips64_get_tcb()
63
64#endif /* _KERNEL */
65
66#endif /* _MACHINE_TCB_H_ */