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/mips/include/pcb.h

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    1 /*      $OpenBSD: pcb.h,v 1.3 1998/09/15 10:50:12 pefo Exp $    */
    2 
    3 /*-
    4  * SPDX-License-Identifier: BSD-3-Clause
    5  *
    6  * Copyright (c) 1988 University of Utah.
    7  * Copyright (c) 1992, 1993
    8  *      The Regents of the University of California.  All rights reserved.
    9  *
   10  * This code is derived from software contributed to Berkeley by
   11  * the Systems Programming Group of the University of Utah Computer
   12  * Science Department and Ralph Campbell.
   13  *
   14  * Redistribution and use in source and binary forms, with or without
   15  * modification, are permitted provided that the following conditions
   16  * are met:
   17  * 1. Redistributions of source code must retain the above copyright
   18  *    notice, this list of conditions and the following disclaimer.
   19  * 2. Redistributions in binary form must reproduce the above copyright
   20  *    notice, this list of conditions and the following disclaimer in the
   21  *    documentation and/or other materials provided with the distribution.
   22  * 3. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  *      from: Utah Hdr: pcb.h 1.13 89/04/23
   39  *      from: @(#)pcb.h 8.1 (Berkeley) 6/10/93
   40  *      JNPR: pcb.h,v 1.2 2006/08/07 11:51:17 katta
   41  * $FreeBSD$
   42  */
   43 
   44 #ifndef _MACHINE_PCB_H_
   45 #define _MACHINE_PCB_H_
   46 
   47 /*
   48  * used by switch.S
   49  */
   50 #define PCB_REG_S0      0
   51 #define PCB_REG_S1      1
   52 #define PCB_REG_S2      2
   53 #define PCB_REG_S3      3
   54 #define PCB_REG_S4      4
   55 #define PCB_REG_S5      5
   56 #define PCB_REG_S6      6
   57 #define PCB_REG_S7      7
   58 #define PCB_REG_SP      8
   59 #define PCB_REG_S8      9
   60 #define PCB_REG_RA      10
   61 #define PCB_REG_SR      11
   62 #define PCB_REG_GP      12
   63 #define PCB_REG_PC      13
   64 
   65 /*
   66  * Call ast if required
   67  *
   68  * XXX Do we really need to disable interrupts?
   69  */
   70 #define DO_AST                                       \
   71 44:                                                  \
   72         mfc0    t0, MIPS_COP_0_STATUS               ;\
   73         and     a0, t0, MIPS_SR_INT_IE              ;\
   74         xor     t0, a0, t0                          ;\
   75         mtc0    t0, MIPS_COP_0_STATUS               ;\
   76         COP0_SYNC                                   ;\
   77         GET_CPU_PCPU(s1)                            ;\
   78         PTR_L   s3, PC_CURPCB(s1)                   ;\
   79         PTR_L   s1, PC_CURTHREAD(s1)                ;\
   80         lw      s2, TD_FLAGS(s1)                    ;\
   81         li      s0, TDF_ASTPENDING | TDF_NEEDRESCHED;\
   82         and     s2, s0                              ;\
   83         mfc0    t0, MIPS_COP_0_STATUS               ;\
   84         or      t0, a0, t0                          ;\
   85         mtc0    t0, MIPS_COP_0_STATUS               ;\
   86         COP0_SYNC                                   ;\
   87         beq     s2, zero, 4f                        ;\
   88         nop                                         ;\
   89         PTR_LA  s0, _C_LABEL(ast)                   ;\
   90         jalr    s0                                  ;\
   91         PTR_ADDU a0, s3, U_PCB_REGS                 ;\
   92         j       44b                                 ;\
   93         nop                                         ;\
   94 4:
   95 
   96 #define SAVE_U_PCB_REG(reg, offs, base) \
   97         REG_S   reg, U_PCB_REGS + (SZREG * offs) (base)
   98 
   99 #define RESTORE_U_PCB_REG(reg, offs, base) \
  100         REG_L   reg, U_PCB_REGS + (SZREG * offs) (base)
  101 
  102 #define SAVE_U_PCB_FPREG(reg, offs, base) \
  103         FP_S    reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
  104 
  105 #define RESTORE_U_PCB_FPREG(reg, offs, base) \
  106         FP_L    reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
  107 
  108 #define SAVE_U_PCB_FPSR(reg, offs, base) \
  109         REG_S   reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
  110 
  111 #define RESTORE_U_PCB_FPSR(reg, offs, base) \
  112         REG_L   reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
  113 
  114 #define SAVE_U_PCB_CONTEXT(reg, offs, base) \
  115         REG_S   reg, U_PCB_CONTEXT + (SZREG * offs) (base)
  116 
  117 #define RESTORE_U_PCB_CONTEXT(reg, offs, base) \
  118         REG_L   reg, U_PCB_CONTEXT + (SZREG * offs) (base)
  119 
  120 #ifndef LOCORE
  121 #include <machine/frame.h>
  122 
  123 /*
  124  * MIPS process control block
  125  */
  126 struct pcb
  127 {
  128         struct trapframe pcb_regs;      /* saved CPU and registers */
  129         __register_t pcb_context[14];   /* kernel context for resume */
  130         void *pcb_onfault;              /* for copyin/copyout faults */
  131         register_t pcb_tpc;
  132 };
  133 
  134 #ifdef _KERNEL
  135 extern struct pcb *curpcb;              /* the current running pcb */
  136 
  137 void makectx(struct trapframe *, struct pcb *);
  138 int savectx(struct pcb *) __returns_twice;
  139 
  140 #endif
  141 #endif
  142 
  143 #endif  /* !_MACHINE_PCB_H_ */

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