FreeBSD/Linux Kernel Cross Reference
sys/i386/include/proc.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1991 Regents of the University of California.
      * All rights reserved.
      *
      * 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.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
     *
     *      from: @(#)proc.h        7.1 (Berkeley) 5/15/91
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_PROC_H_
    #define _MACHINE_PROC_H_
    
    #include <machine/segments.h>
    
    struct proc_ldt {
            caddr_t ldt_base;
            int     ldt_len;
            int     ldt_refcnt;
            u_long  ldt_active;
            struct  segment_descriptor ldt_sd;
    };
    
    /*
     * Machine-dependent part of the proc structure for i386.
     * Table of MD locks:
     *       t - Descriptor tables lock
     */
    struct mdthread {
            int     md_spinlock_count;      /* (k) */
            register_t md_saved_flags;      /* (k) */
            register_t md_spurflt_addr;     /* (k) Spurious page fault address. */
    };
    
    struct mdproc {
            struct proc_ldt *md_ldt;        /* (t) per-process ldt */
    };
    
    #define KINFO_PROC_SIZE 768
    
    #ifdef  _KERNEL
    
    #include <machine/md_var.h>
    
    /* Get the current kernel thread stack usage. */
    #define GET_STACK_USAGE(total, used) do {                               \
            struct thread   *td = curthread;                                \
            (total) = (vm_offset_t)get_pcb_td(td) - td->td_kstack;          \
            (used) = (vm_offset_t)get_pcb_td(td) - (vm_offset_t)&td;        \
    } while (0)
    
    void    set_user_ldt(struct mdproc *);
    struct  proc_ldt *user_ldt_alloc(struct mdproc *, int);
    void    user_ldt_free(struct thread *);
    void    user_ldt_deref(struct proc_ldt *pldt);
    
    extern struct mtx dt_lock;
    #endif  /* _KERNEL */
    
    #endif /* !_MACHINE_PROC_H_ */

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