FreeBSD/Linux Kernel Cross Reference
sys/amd64/include/pcb.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 2003 Peter Wemm.
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * William Jolitz.
     *
     * 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: @(#)pcb.h 5.10 (Berkeley) 5/12/91
     * $FreeBSD$
     */
    
    #ifndef _AMD64_PCB_H_
    #define _AMD64_PCB_H_
    
    /*
     * AMD64 process control block
     */
    #include <machine/fpu.h>
    #include <machine/segments.h>
    
    #ifdef __amd64__
    /*
     * NB: The fields marked with (*) are used by kernel debuggers.  Their
     * ABI should be preserved.
     */
    struct pcb {
            register_t      pcb_r15;        /* (*) */
            register_t      pcb_r14;        /* (*) */
            register_t      pcb_r13;        /* (*) */
            register_t      pcb_r12;        /* (*) */
            register_t      pcb_rbp;        /* (*) */
            register_t      pcb_rsp;        /* (*) */
            register_t      pcb_rbx;        /* (*) */
            register_t      pcb_rip;        /* (*) */
            register_t      pcb_fsbase;
            register_t      pcb_gsbase;
            register_t      pcb_kgsbase;
            register_t      pcb_cr0;
            register_t      pcb_cr2;
            register_t      pcb_cr3;
            register_t      pcb_cr4;
            register_t      pcb_dr0;
            register_t      pcb_dr1;
            register_t      pcb_dr2;
            register_t      pcb_dr3;
            register_t      pcb_dr6;
            register_t      pcb_dr7;
    
            struct region_descriptor pcb_gdt;
            struct region_descriptor pcb_idt;
            struct region_descriptor pcb_ldt;
            uint16_t        pcb_tr;
    
            u_int           pcb_flags;
    #define PCB_FULL_IRET   0x01    /* full iret is required */
    #define PCB_DBREGS      0x02    /* process using debug registers */
    #define PCB_KERNFPU     0x04    /* kernel uses fpu */
    #define PCB_FPUINITDONE 0x08    /* fpu state is initialized */
    #define PCB_USERFPUINITDONE 0x10 /* fpu user state is initialized */
    #define PCB_KERNFPU_THR 0x20    /* fpu_kern_thread() */
    #define PCB_32BIT       0x40    /* process has 32 bit context (segs etc) */
    #define PCB_FPUNOSAVE   0x80    /* no save area for current FPU ctx */
    
            uint16_t        pcb_initial_fpucw;
    
            /* copyin/out fault recovery */
            caddr_t         pcb_onfault;
    
            uint64_t        pcb_saved_ucr3;
    
            /* local tss, with i/o bitmap; NULL for common */
            struct amd64tss *pcb_tssp;
   
           /* model specific registers */
           register_t      pcb_efer;
           register_t      pcb_star;
           register_t      pcb_lstar;
           register_t      pcb_cstar;
           register_t      pcb_sfmask;
   
           struct savefpu  *pcb_save;
   
           uint64_t        pcb_pad[5];
   };
   
   /* Per-CPU state saved during suspend and resume. */
   struct susppcb {
           struct pcb      sp_pcb;
   
           /* fpu context for suspend/resume */
           void            *sp_fpususpend;
   };
   #else   /* 32bit */
   struct pcb {
           uint64_t pcb_dummy[40];
   };
   #endif
   
   #ifdef _KERNEL
   struct trapframe;
   
   void    clear_pcb_flags(struct pcb *pcb, const u_int flags);
   void    makectx(struct trapframe *, struct pcb *);
   void    set_pcb_flags(struct pcb *pcb, const u_int flags);
   void    set_pcb_flags_raw(struct pcb *pcb, const u_int flags);
   int     savectx(struct pcb *) __returns_twice;
   void    resumectx(struct pcb *);
   
   /* Ensure that pcb_gsbase and pcb_fsbase are up to date */
   #define update_pcb_bases(pcb)   set_pcb_flags((pcb), PCB_FULL_IRET)
   #endif
   
   #endif /* _AMD64_PCB_H_ */

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