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/i386/include/pcb.h

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    1 /*-
    2  * Copyright (c) 1990 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * William Jolitz.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from: @(#)pcb.h 5.10 (Berkeley) 5/12/91
   33  * $FreeBSD: releng/10.4/sys/i386/include/pcb.h 294283 2016-01-18 18:27:21Z jhb $
   34  */
   35 
   36 #ifndef _I386_PCB_H_
   37 #define _I386_PCB_H_
   38 
   39 /*
   40  * Intel 386 process control block
   41  */
   42 #ifndef _KERNEL
   43 #include <machine/segments.h>
   44 #endif
   45 #include <machine/npx.h>
   46 
   47 /*
   48  * NB: The fields marked with (*) are used by kernel debuggers.  Their
   49  * ABI should be preserved.
   50  */
   51 struct pcb {
   52         int     pcb_edi;        /* (*) */
   53         int     pcb_esi;        /* (*) */
   54         int     pcb_ebp;        /* (*) */
   55         int     pcb_esp;        /* (*) */
   56         int     pcb_ebx;        /* (*) */
   57         int     pcb_eip;        /* (*) */
   58         struct segment_descriptor pcb_fsd;
   59         struct segment_descriptor pcb_gsd;
   60         int     pcb_ds;
   61         int     pcb_es;
   62         int     pcb_fs;
   63         int     pcb_gs;
   64         int     pcb_ss;
   65         int     pcb_cr0;
   66         int     pcb_cr2;
   67         int     pcb_cr3;
   68         int     pcb_cr4;
   69         int     pcb_dr0;
   70         int     pcb_dr1;
   71         int     pcb_dr2;
   72         int     pcb_dr3;
   73         int     pcb_dr6;
   74         int     pcb_dr7;
   75 
   76         struct region_descriptor pcb_gdt;
   77         struct region_descriptor pcb_idt;
   78         uint16_t        pcb_ldt;
   79         uint16_t        pcb_tr;
   80 
   81         u_int   pcb_flags;
   82 #define PCB_DBREGS      0x02    /* process using debug registers */
   83 #define PCB_NPXINITDONE 0x08    /* fpu state is initialized */
   84 #define PCB_VM86CALL    0x10    /* in vm86 call */
   85 #define PCB_NPXUSERINITDONE 0x20 /* user fpu state is initialized */
   86 #define PCB_KERNNPX     0x40    /* kernel uses npx */
   87 
   88         uint16_t pcb_initial_npxcw;
   89 
   90         caddr_t pcb_onfault;    /* copyin/out fault recovery */
   91         struct  pcb_ext *pcb_ext;       /* optional pcb extension */
   92         int     pcb_psl;        /* process status long */
   93         u_long  pcb_vm86[2];    /* vm86bios scratch space */
   94         union   savefpu *pcb_save;
   95 
   96         uint32_t pcb_pad[10];
   97 };
   98 
   99 /* Per-CPU state saved during suspend and resume. */
  100 struct susppcb {
  101         struct pcb      sp_pcb;
  102 
  103         /* fpu context for suspend/resume */
  104         void            *sp_fpususpend;
  105 };
  106 
  107 #ifdef _KERNEL
  108 struct trapframe;
  109 
  110 void    makectx(struct trapframe *, struct pcb *);
  111 int     savectx(struct pcb *) __returns_twice;
  112 void    resumectx(struct pcb *) __fastcall;
  113 #endif
  114 
  115 #endif /* _I386_PCB_H_ */

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