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
24 static inline void
__mips64_set_tcb(struct proc * p,void * tcb)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
45 static inline void *
__mips64_get_tcb(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_ */
67