1/*	$OpenBSD: tcb.h,v 1.2 2016/05/15 23:37:42 guenther 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
24void	*tcb_get(struct proc *_p);
25void	tcb_set(struct proc *_p, void *_newtcb);
26
27#define TCB_GET(p)		tcb_get(p)
28#define TCB_SET(p, addr)	tcb_set(p, addr)
29
30#else /* _KERNEL */
31
32/* ELF TLS ABI calls for small TCB, with static TLS data after it */
33#define TLS_VARIANT	1
34
35static inline void *
36__alpha_get_tcb(void)
37{
38	register void *__tmp __asm__("$0");
39
40	__asm__ ("call_pal %1 # PAL_rdunique"
41		: "=r" (__tmp)
42		: "i" (0x009e /* PAL_rdunique */));
43	return __tmp;
44}
45#define TCB_GET()		__alpha_get_tcb()
46
47static inline void
48__alpha_set_tcb(void *__val)
49{
50	register void *__tmp __asm__("$16") = __val;
51
52	__asm__ volatile ("call_pal %1 # PAL_wrunique"
53		: "=r" (__tmp)
54		: "i" (0x009f /* PAL_wrunique */), "0" (__tmp));
55}
56#define TCB_SET(addr)		__alpha_set_tcb(addr)
57
58#endif /* _KERNEL */
59
60#endif /* _MACHINE_TCB_H_ */
61