LCOM1920-T02G10

/*        $NetBSD: lwpctl.h,v 1.4 2008/04/28 20:24:10 martin Exp $        */

/*-

 * Copyright (c) 2007, 2008 The NetBSD Foundation, Inc.

 * All rights reserved.

 *

 * This code is derived from software contributed to The NetBSD Foundation

 * by Andrew Doran.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS

 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED

 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS

 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 */

#if !defined(_SYS_LWPCTL_H_)

#define        _SYS_LWPCTL_H_

/*

 * Note on compatibility:

 *

 * This must be the same size for both 32 and 64-bit processes, since

 * the same format will be used by both.

 *

 * Removal of unused fields is OK, as long as the change in layout

 * does not affect supported fields.

 *

 * It is OK to add fields to this structure, since the kernel allocates

 * the space.  Re-use of fields is more complicated - see the feature

 * word passed to the system call.

 */

typedef struct lwpctl {

        volatile int        lc_curcpu;

        volatile int        lc_pctr;

} lwpctl_t;

#define        LWPCTL_CPU_NONE                (-1)

#define        LWPCTL_CPU_EXITED        (-2)

#define        LWPCTL_FEATURE_CURCPU        0x00000001

#define        LWPCTL_FEATURE_PCTR        0x00000002

#if defined(_KERNEL)

#include <sys/mutex.h>

#include <uvm/uvm_extern.h>

typedef struct lcpage {

        TAILQ_ENTRY(lcpage) lcp_chain;

        vaddr_t                lcp_uaddr;

        vaddr_t                lcp_kaddr;

        u_int                lcp_nfree;

        u_int                lcp_rotor;

        u_int                lcp_bitmap[1];

} lcpage_t;

typedef struct lcproc {

        kmutex_t        lp_lock;

        struct uvm_object *lp_uao;

        TAILQ_HEAD(,lcpage) lp_pages;

        vaddr_t                lp_cur;

        vaddr_t                lp_max;

        vaddr_t                lp_uva;

} lcproc_t;

#define        LWPCTL_PER_PAGE                ((PAGE_SIZE / sizeof(lwpctl_t)) & ~31)

#define        LWPCTL_BITMAP_ENTRIES        (LWPCTL_PER_PAGE >> 5)

#define        LWPCTL_BITMAP_SZ        (LWPCTL_BITMAP_ENTRIES * sizeof(u_int))

#define        LWPCTL_LCPAGE_SZ        \

    (sizeof(lcpage_t) - sizeof(u_int) + LWPCTL_BITMAP_SZ)

#define        LWPCTL_UAREA_SZ                \

    (round_page(MAX_LWP_PER_PROC * sizeof(lwpctl_t)))

int        lwp_ctl_alloc(vaddr_t *);

void        lwp_ctl_free(lwp_t *);

void        lwp_ctl_exit(void);

#endif /* defined(_KERNEL) */

#endif /* !_SYS_LWPCTL_H_ */