The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/lwpctl.h

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    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_ */

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