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kvm_vax.c revision 1.2 
      1 /*	$NetBSD: kvm_vax.c,v 1.2 1995/04/25 15:41:11 ragge Exp $ */
      2 /*-
      3  * Copyright (c) 1992, 1993
      4  *	The Regents of the University of California.  All rights reserved.
      5  *
      6  * This code is derived from software developed by the Computer Systems
      7  * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
      8  * BG 91-66 and contributed to Berkeley.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. 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 
     39 /*
     40  * VAX machine dependent routines for kvm.  Hopefully, the forthcoming
     41  * vm code will one day obsolete this module.  Furthermore, I hope it
     42  * gets here soon, because this basically is an error stub! (sorry)
     43  * This code may not work anyway.
     44  */
     45 
     46 #include <sys/param.h>
     47 #include <sys/user.h>
     48 #include <sys/proc.h>
     49 #include <sys/stat.h>
     50 #include <unistd.h>
     51 #include <nlist.h>
     52 #include <kvm.h>
     53 
     54 #include <vm/vm.h>
     55 #include <vm/vm_param.h>
     56 
     57 #include <limits.h>
     58 #include <db.h>
     59 
     60 #include "kvm_private.h"
     61 
     62 struct vmstate {
     63 	u_long end;
     64 };
     65 
     66 void
     67 _kvm_freevtop(kd)
     68 	kvm_t *kd;
     69 {
     70 	if (kd->vmst != 0)
     71 		free(kd->vmst);
     72 }
     73 
     74 int
     75 _kvm_initvtop(kd)
     76 	kvm_t *kd;
     77 {
     78 	register int i;
     79 	register int off;
     80 	register struct vmstate *vm;
     81 	struct stat st;
     82 	struct nlist nlist[2];
     83 
     84 	vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
     85 	if (vm == 0)
     86 		return (-1);
     87 
     88 	kd->vmst = vm;
     89 
     90 	if (fstat(kd->pmfd, &st) < 0)
     91 		return (-1);
     92 
     93 	/* Get end of kernel address */
     94 	nlist[0].n_name = "_end";
     95 	nlist[1].n_name = 0;
     96 	if (kvm_nlist(kd, nlist) != 0) {
     97 		_kvm_err(kd, kd->program, "pmap_stod: no such symbol");
     98 		return (-1);
     99 	}
    100 	vm->end = (u_long)nlist[0].n_value;
    101 
    102 	return (0);
    103 }
    104 
    105 #define VA_OFF(va) (va & (NBPG - 1))
    106 
    107 /*
    108  * Translate a kernel virtual address to a physical address using the
    109  * mapping information in kd->vm.  Returns the result in pa, and returns
    110  * the number of bytes that are contiguously available from this
    111  * physical address.  This routine is used only for crashdumps.
    112  */
    113 int
    114 _kvm_kvatop(kd, va, pa)
    115 	kvm_t *kd;
    116 	u_long va;
    117 	u_long *pa;
    118 {
    119 	register int end;
    120 
    121 	if (va < KERNBASE) {
    122 		_kvm_err(kd, 0, "invalid address (%x<%x)", va, KERNBASE);
    123 		return (0);
    124 	}
    125 
    126 	end = kd->vmst->end;
    127 	if (va >= end) {
    128 		_kvm_err(kd, 0, "invalid address (%x>=%x)", va, end);
    129 		return (0);
    130 	}
    131 
    132 	*pa = (va - KERNBASE);
    133 	return (end - va);
    134 }
    135