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 */ 48 typedef 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 65 typedef 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 74 typedef 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 91 int lwp_ctl_alloc(vaddr_t *); 92 void lwp_ctl_free(lwp_t *); 93 void lwp_ctl_exit(void); 94 95 #endif /* defined(_KERNEL) */ 96 97 #endif /* !_SYS_LWPCTL_H_ */ 98