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  * Copyright (c) 1988 University of Utah.
    5  * Copyright (c) 1992, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * This code is derived from software contributed to Berkeley by
    9  * the Systems Programming Group of the University of Utah Computer
   10  * Science Department and Ralph Campbell.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      from: Utah Hdr: pcb.h 1.13 89/04/23
   37  *      from: @(#)pcb.h 8.1 (Berkeley) 6/10/93
   38  *      JNPR: pcb.h,v 1.2 2006/08/07 11:51:17 katta
   39  * $FreeBSD: releng/11.0/sys/mips/include/pcb.h 256494 2013-10-15 04:36:34Z imp $
   40  */
   41 
   42 #ifndef _MACHINE_PCB_H_
   43 #define _MACHINE_PCB_H_
   44 
   45 /*
   46  * used by switch.S
   47  */
   48 #define PCB_REG_S0      0
   49 #define PCB_REG_S1      1
   50 #define PCB_REG_S2      2
   51 #define PCB_REG_S3      3
   52 #define PCB_REG_S4      4
   53 #define PCB_REG_S5      5
   54 #define PCB_REG_S6      6
   55 #define PCB_REG_S7      7
   56 #define PCB_REG_SP      8
   57 #define PCB_REG_S8      9
   58 #define PCB_REG_RA      10
   59 #define PCB_REG_SR      11
   60 #define PCB_REG_GP      12
   61 #define PCB_REG_PC      13
   62 
   63 /*
   64  * Call ast if required
   65  *
   66  * XXX Do we really need to disable interrupts?
   67  */
   68 #define DO_AST                                       \
   69 44:                                                  \
   70         mfc0    t0, MIPS_COP_0_STATUS               ;\
   71         and     a0, t0, MIPS_SR_INT_IE              ;\
   72         xor     t0, a0, t0                          ;\
   73         mtc0    t0, MIPS_COP_0_STATUS               ;\
   74         COP0_SYNC                                   ;\
   75         GET_CPU_PCPU(s1)                            ;\
   76         PTR_L   s3, PC_CURPCB(s1)                   ;\
   77         PTR_L   s1, PC_CURTHREAD(s1)                ;\
   78         lw      s2, TD_FLAGS(s1)                    ;\
   79         li      s0, TDF_ASTPENDING | TDF_NEEDRESCHED;\
   80         and     s2, s0                              ;\
   81         mfc0    t0, MIPS_COP_0_STATUS               ;\
   82         or      t0, a0, t0                          ;\
   83         mtc0    t0, MIPS_COP_0_STATUS               ;\
   84         COP0_SYNC                                   ;\
   85         beq     s2, zero, 4f                        ;\
   86         nop                                         ;\
   87         PTR_LA  s0, _C_LABEL(ast)                   ;\
   88         jalr    s0                                  ;\
   89         PTR_ADDU a0, s3, U_PCB_REGS                 ;\
   90         j       44b                                 ;\
   91         nop                                         ;\
   92 4:
   93 
   94 #define SAVE_U_PCB_REG(reg, offs, base) \
   95         REG_S   reg, U_PCB_REGS + (SZREG * offs) (base)
   96 
   97 #define RESTORE_U_PCB_REG(reg, offs, base) \
   98         REG_L   reg, U_PCB_REGS + (SZREG * offs) (base)
   99 
  100 #define SAVE_U_PCB_FPREG(reg, offs, base) \
  101         FP_S    reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
  102 
  103 #define RESTORE_U_PCB_FPREG(reg, offs, base) \
  104         FP_L    reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
  105 
  106 #define SAVE_U_PCB_FPSR(reg, offs, base) \
  107         REG_S   reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
  108 
  109 #define RESTORE_U_PCB_FPSR(reg, offs, base) \
  110         REG_L   reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
  111 
  112 #define SAVE_U_PCB_CONTEXT(reg, offs, base) \
  113         REG_S   reg, U_PCB_CONTEXT + (SZREG * offs) (base)
  114 
  115 #define RESTORE_U_PCB_CONTEXT(reg, offs, base) \
  116         REG_L   reg, U_PCB_CONTEXT + (SZREG * offs) (base)
  117 
  118 #ifndef LOCORE
  119 #include <machine/frame.h>
  120 
  121 /*
  122  * MIPS process control block
  123  */
  124 struct pcb
  125 {
  126         struct trapframe pcb_regs;      /* saved CPU and registers */
  127         __register_t pcb_context[14];   /* kernel context for resume */
  128         void *pcb_onfault;              /* for copyin/copyout faults */
  129         register_t pcb_tpc;
  130 };
  131 
  132 #ifdef _KERNEL
  133 extern struct pcb *curpcb;              /* the current running pcb */
  134 
  135 void makectx(struct trapframe *, struct pcb *);
  136 int savectx(struct pcb *) __returns_twice;
  137 
  138 #endif
  139 #endif
  140 
  141 #endif  /* !_MACHINE_PCB_H_ */

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