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Annotation of sys/arch/alpha/include/proc.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: proc.h,v 1.10 2006/03/17 21:43:29 miod Exp $  */
        !             2: /*     $NetBSD: proc.h,v 1.2 1995/03/24 15:01:36 cgd Exp $     */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1994, 1995 Carnegie-Mellon University.
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * Author: Chris G. Demetriou
        !             9:  *
        !            10:  * Permission to use, copy, modify and distribute this software and
        !            11:  * its documentation is hereby granted, provided that both the copyright
        !            12:  * notice and this permission notice appear in all copies of the
        !            13:  * software, derivative works or modified versions, and any portions
        !            14:  * thereof, and that both notices appear in supporting documentation.
        !            15:  *
        !            16:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            17:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
        !            18:  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            19:  *
        !            20:  * Carnegie Mellon requests users of this software to return to
        !            21:  *
        !            22:  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
        !            23:  *  School of Computer Science
        !            24:  *  Carnegie Mellon University
        !            25:  *  Pittsburgh PA 15213-3890
        !            26:  *
        !            27:  * any improvements or extensions that they make and grant Carnegie the
        !            28:  * rights to redistribute these changes.
        !            29:  */
        !            30:
        !            31: #include <machine/cpu.h>
        !            32: /*
        !            33:  * Machine-dependent part of the proc struct for the Alpha.
        !            34:  */
        !            35:
        !            36: struct mdbpt {
        !            37:        vaddr_t addr;
        !            38:        u_int32_t contents;
        !            39: };
        !            40:
        !            41: struct mdproc {
        !            42:        u_long md_flags;
        !            43:        struct trapframe *md_tf;        /* trap/syscall registers */
        !            44:        struct pcb *md_pcbpaddr;        /* phys addr of the pcb */
        !            45:        struct mdbpt md_sstep[2];       /* two breakpoints for sstep */
        !            46: };
        !            47:
        !            48: /*
        !            49:  * md_flags usage
        !            50:  * --------------
        !            51:  * MDP_FPUSED
        !            52:  *      A largely unused bit indicating the presence of FPU history.
        !            53:  *      Cleared on exec. Set but not used by the fpu context switcher
        !            54:  *      itself.
        !            55:  *
        !            56:  * MDP_FP_C
        !            57:  *      The architected FP Control word. It should forever begin at bit 1,
        !            58:  *      as the bits are AARM specified and this way it doesn't need to be
        !            59:  *      shifted.
        !            60:  *
        !            61:  *      Until C99 there was never an IEEE 754 API, making most of the
        !            62:  *      standard useless.  Because of overlapping AARM, OSF/1, NetBSD, and
        !            63:  *      C99 API's, the use of the MDP_FP_C bits is defined variously in
        !            64:  *      ieeefp.h and fpu.h.
        !            65:  */
        !            66: #define        MDP_FPUSED      0x00000001              /* Process used the FPU */
        !            67: #ifndef NO_IEEE
        !            68: #define        MDP_FP_C        0x007ffffe      /* Extended FP_C Quadword bits */
        !            69: #endif
        !            70: #define MDP_STEP1      0x00800000      /* Single step normal */
        !            71: #define MDP_STEP2      0x01800000      /* Single step branch */