1/*-
 2 * Mach Operating System
 3 * Copyright (c) 1992 Carnegie Mellon University
 4 * All Rights Reserved.
 5 *
 6 * Permission to use, copy, modify and distribute this software and its
 7 * documentation is hereby granted, provided that both the copyright
 8 * notice and this permission notice appear in all copies of the
 9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
13 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
19 *  School of Computer Science
20 *  Carnegie Mellon University
21 *  Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie Mellon
24 * the rights to redistribute these changes.
25 */
26
27#ifndef _MACHINE_STACK_H_
28#define	_MACHINE_STACK_H_
29
30extern int trapexit[];
31extern int asttrapexit[];
32extern int end[];
33
34#ifdef _SYS_PROC_H_
35
36#include <machine/pcb.h>
37
38/* Get the current kernel thread stack usage. */
39#define	GET_STACK_USAGE(total, used) do {				\
40	struct thread *td = curthread;					\
41	(total) = td->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb);	\
42	(used) = td->td_kstack + (total) - (vm_offset_t)&td;		\
43} while (0)
44
45static __inline bool
46kstack_contains(struct thread *td, vm_offset_t va, size_t len)
47{
48	return (va >= td->td_kstack && va + len >= va &&
49	    va + len <= td->td_kstack + td->td_kstack_pages * PAGE_SIZE -
50	    sizeof(struct pcb));
51}
52#endif	/* _SYS_PROC_H_ */
53
54#endif /* !_MACHINE_STACK_H_ */