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

     /*      $OpenBSD: pcb.h,v 1.3 1998/09/15 10:50:12 pefo Exp $    */
     
     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1988 University of Utah.
      * Copyright (c) 1992, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
     * This code is derived from software contributed to Berkeley by
     * the Systems Programming Group of the University of Utah Computer
     * Science Department and Ralph Campbell.
     *
     * 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: Utah Hdr: pcb.h 1.13 89/04/23
     *      from: @(#)pcb.h 8.1 (Berkeley) 6/10/93
     *      JNPR: pcb.h,v 1.2 2006/08/07 11:51:17 katta
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_PCB_H_
    #define _MACHINE_PCB_H_
    
    /*
     * used by switch.S
     */
    #define PCB_REG_S0      0
    #define PCB_REG_S1      1
    #define PCB_REG_S2      2
    #define PCB_REG_S3      3
    #define PCB_REG_S4      4
    #define PCB_REG_S5      5
    #define PCB_REG_S6      6
    #define PCB_REG_S7      7
    #define PCB_REG_SP      8
    #define PCB_REG_S8      9
    #define PCB_REG_RA      10
    #define PCB_REG_SR      11
    #define PCB_REG_GP      12
    #define PCB_REG_PC      13
    
    /*
     * Call ast if required
     *
     * XXX Do we really need to disable interrupts?
     */
    #define DO_AST                                       \
    44:                                                  \
            mfc0    t0, MIPS_COP_0_STATUS               ;\
            and     a0, t0, MIPS_SR_INT_IE              ;\
            xor     t0, a0, t0                          ;\
            mtc0    t0, MIPS_COP_0_STATUS               ;\
            COP0_SYNC                                   ;\
            GET_CPU_PCPU(s1)                            ;\
            PTR_L   s3, PC_CURPCB(s1)                   ;\
            PTR_L   s1, PC_CURTHREAD(s1)                ;\
            lw      s2, TD_FLAGS(s1)                    ;\
            li      s0, TDF_ASTPENDING | TDF_NEEDRESCHED;\
            and     s2, s0                              ;\
            mfc0    t0, MIPS_COP_0_STATUS               ;\
            or      t0, a0, t0                          ;\
            mtc0    t0, MIPS_COP_0_STATUS               ;\
            COP0_SYNC                                   ;\
            beq     s2, zero, 4f                        ;\
            nop                                         ;\
            PTR_LA  s0, _C_LABEL(ast)                   ;\
            jalr    s0                                  ;\
            PTR_ADDU a0, s3, U_PCB_REGS                 ;\
            j       44b                                 ;\
            nop                                         ;\
    4:
    
    #define SAVE_U_PCB_REG(reg, offs, base) \
            REG_S   reg, U_PCB_REGS + (SZREG * offs) (base)
    
    #define RESTORE_U_PCB_REG(reg, offs, base) \
           REG_L   reg, U_PCB_REGS + (SZREG * offs) (base)
   
   #define SAVE_U_PCB_FPREG(reg, offs, base) \
           FP_S    reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
   
   #define RESTORE_U_PCB_FPREG(reg, offs, base) \
           FP_L    reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
   
   #define SAVE_U_PCB_FPSR(reg, offs, base) \
           REG_S   reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
   
   #define RESTORE_U_PCB_FPSR(reg, offs, base) \
           REG_L   reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
   
   #define SAVE_U_PCB_CONTEXT(reg, offs, base) \
           REG_S   reg, U_PCB_CONTEXT + (SZREG * offs) (base)
   
   #define RESTORE_U_PCB_CONTEXT(reg, offs, base) \
           REG_L   reg, U_PCB_CONTEXT + (SZREG * offs) (base)
   
   #ifndef LOCORE
   #include <machine/frame.h>
   
   /*
    * MIPS process control block
    */
   struct pcb
   {
           struct trapframe pcb_regs;      /* saved CPU and registers */
           __register_t pcb_context[14];   /* kernel context for resume */
           void *pcb_onfault;              /* for copyin/copyout faults */
           register_t pcb_tpc;
   };
   
   #ifdef _KERNEL
   extern struct pcb *curpcb;              /* the current running pcb */
   
   void makectx(struct trapframe *, struct pcb *);
   int savectx(struct pcb *) __returns_twice;
   
   #endif
   #endif
   
   #endif  /* !_MACHINE_PCB_H_ */

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