xref: /openbsd/sys/arch/arm/include/tcb.h (revision 274d7c50)
1 /*	$OpenBSD: tcb.h,v 1.3 2016/10/02 20:11:32 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 
24 #include <machine/pcb.h>
25 
26 static inline void
27 __arm_set_tcb(void *tcb)
28 {
29 	__asm volatile("mcr p15, 0, %0, c13, c0, 3\n" : : "r" (tcb));
30 }
31 
32 #define TCB_GET(p)		\
33 	((struct pcb *)(p)->p_addr)->pcb_tcb
34 
35 #define TCB_SET(p, addr)	\
36 	do {							\
37 		((struct pcb *)(p)->p_addr)->pcb_tcb = (addr);	\
38 		__arm_set_tcb(addr);				\
39 	} while (0)
40 
41 #else /* _KERNEL */
42 
43 /* ELF TLS ABI calls for small TCB, with static TLS data after it */
44 #define TLS_VARIANT	1
45 
46 static inline void *
47 __arm_read_tcb(void)
48 {
49 	void *tcb;
50 	__asm volatile("mrc p15, 0, %0, c13, c0, 3\n" : "=r" (tcb));
51 	return tcb;
52 }
53 
54 #define TCB_GET()		__arm_read_tcb()
55 
56 #endif /* _KERNEL */
57 
58 #endif /* _MACHINE_TCB_H_ */
59