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Annotation of sys/arch/alpha/include/proc.h, Revision 1.1.1.1

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 */