1/*	$NetBSD: lwpctl.h,v 1.4 2008/04/28 20:24:10 martin Exp $	*/
 2
 3/*-
 4 * Copyright (c) 2007, 2008 The NetBSD Foundation, Inc.
 5 * All rights reserved.
 6 *
 7 * This code is derived from software contributed to The NetBSD Foundation
 8 * by Andrew Doran.
 9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#if !defined(_SYS_LWPCTL_H_)
33#define	_SYS_LWPCTL_H_
34
35/*
36 * Note on compatibility:
37 *
38 * This must be the same size for both 32 and 64-bit processes, since
39 * the same format will be used by both.
40 *
41 * Removal of unused fields is OK, as long as the change in layout
42 * does not affect supported fields.
43 *
44 * It is OK to add fields to this structure, since the kernel allocates
45 * the space.  Re-use of fields is more complicated - see the feature
46 * word passed to the system call.
47 */
48typedef struct lwpctl {
49	volatile int	lc_curcpu;
50	volatile int	lc_pctr;
51} lwpctl_t;
52
53#define	LWPCTL_CPU_NONE		(-1)
54#define	LWPCTL_CPU_EXITED	(-2)
55
56#define	LWPCTL_FEATURE_CURCPU	0x00000001
57#define	LWPCTL_FEATURE_PCTR	0x00000002
58
59#if defined(_KERNEL)
60
61#include <sys/mutex.h>
62
63#include <uvm/uvm_extern.h>
64
65typedef struct lcpage {
66	TAILQ_ENTRY(lcpage) lcp_chain;
67	vaddr_t		lcp_uaddr;
68	vaddr_t		lcp_kaddr;
69	u_int		lcp_nfree;
70	u_int		lcp_rotor;
71	u_int		lcp_bitmap[1];
72} lcpage_t;
73
74typedef struct lcproc {
75	kmutex_t	lp_lock;
76	struct uvm_object *lp_uao;
77	TAILQ_HEAD(,lcpage) lp_pages;
78	vaddr_t		lp_cur;
79	vaddr_t		lp_max;
80	vaddr_t		lp_uva;
81} lcproc_t;
82
83#define	LWPCTL_PER_PAGE		((PAGE_SIZE / sizeof(lwpctl_t)) & ~31)
84#define	LWPCTL_BITMAP_ENTRIES	(LWPCTL_PER_PAGE >> 5)
85#define	LWPCTL_BITMAP_SZ	(LWPCTL_BITMAP_ENTRIES * sizeof(u_int))
86#define	LWPCTL_LCPAGE_SZ	\
87    (sizeof(lcpage_t) - sizeof(u_int) + LWPCTL_BITMAP_SZ)
88#define	LWPCTL_UAREA_SZ		\
89    (round_page(MAX_LWP_PER_PROC * sizeof(lwpctl_t)))
90
91int	lwp_ctl_alloc(vaddr_t *);
92void	lwp_ctl_free(lwp_t *);
93void	lwp_ctl_exit(void);
94
95#endif /* defined(_KERNEL) */
96
97#endif /* !_SYS_LWPCTL_H_ */