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_ */
98