lib/libkvm/kvm_sun2.c

   1 /*      $NetBSD: kvm_sun2.c,v 1.6 2011/09/14 12:37:55 christos Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software developed by the Computer Systems
   8  * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
   9  * BG 91-66 and contributed to Berkeley.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #if defined(LIBC_SCCS) && !defined(lint)
  38 #if 0
  39 static char sccsid[] = "@(#)kvm_sparc.c 8.1 (Berkeley) 6/4/93";
  40 #else
  41 __RCSID("$NetBSD: kvm_sun2.c,v 1.6 2011/09/14 12:37:55 christos Exp $");
  42 #endif
  43 #endif /* LIBC_SCCS and not lint */
  44
  45 /*
  46  * Sun2 machine dependent routines for kvm.
  47  *
  48  * Note: This file has to build on ALL m68000 machines,
  49  * so do NOT include any <machine / *.h> files here.
  50  */
  51 #include <sys/param.h>
  52 #include <sys/types.h>
  53 #include <sys/kcore.h>
  54
  55 #include <unistd.h>
  56 #include <limits.h>
  57 #include <nlist.h>
  58 #include <kvm.h>
  59 #include <db.h>
  60
  61 #include <m68k/kcore.h>
  62
  63 #include "kvm_private.h"
  64 #include "kvm_m68k.h"
  65
  66 int   _kvm_sun2_initvtop(kvm_t *);
  67 void  _kvm_sun2_freevtop(kvm_t *);
  68 int   _kvm_sun2_kvatop  (kvm_t *, vaddr_t, paddr_t *);
  69 off_t _kvm_sun2_pa2off  (kvm_t *, paddr_t);
  70
  71 struct kvm_ops _kvm_ops_sun2 = {
  72         _kvm_sun2_initvtop,
  73         _kvm_sun2_freevtop,
  74         _kvm_sun2_kvatop,
  75         _kvm_sun2_pa2off };
  76
  77 #define _kvm_pg_pa(v, s, pte)   \
  78         (((pte) & (s)->pg_frame) << (v)->pgshift)
  79
  80 #define _kvm_va_segnum(s, x)    \
  81         ((u_int)(x) >> (s)->segshift)
  82 #define _kvm_pte_num_mask(v)    \
  83         (0xf << (v)->pgshift)
  84 #define _kvm_va_pte_num(v, va)  \
  85         (((va) & _kvm_pte_num_mask((v))) >> (v)->pgshift)
  86
  87 /*
  88  * XXX Re-define these here, no other place for them.
  89  */
  90 #define NKSEG           512     /* kernel segmap entries */
  91 #define NPAGSEG         16      /* pages per segment */
  92
  93 /* Finally, our local stuff... */
  94 struct private_vmstate {
  95         /* Page Map Entry Group (PMEG) */
  96         int   pmeg[NKSEG][NPAGSEG];
  97 };
  98
  99 /*
 100  * Prepare for translation of kernel virtual addresses into offsets
 101  * into crash dump files. We use the MMU specific goop written at the
 102  * beginning of a crash dump by dumpsys()
 103  * Note: sun2 MMU specific!
 104  */
 105 int
 106 _kvm_sun2_initvtop(kvm_t *kd)
 107 {
 108         cpu_kcore_hdr_t *h = kd->cpu_data;
 109         char *p;
 110
 111         p = kd->cpu_data;
 112         p += (h->page_size - sizeof(kcore_seg_t));
 113         kd->vmst->private = p;
 114
 115         return (0);
 116 }
 117
 118 void
 119 _kvm_sun2_freevtop(kvm_t *kd)
 120 {
 121         /* This was set by pointer arithmetic, not allocation. */
 122         kd->vmst->private = (void*)0;
 123 }
 124
 125 /*
 126  * Translate a kernel virtual address to a physical address using the
 127  * mapping information in kd->vm.  Returns the result in pa, and returns
 128  * the number of bytes that are contiguously available from this
 129  * physical address.  This routine is used only for crash dumps.
 130  */
 131 int
 132 _kvm_sun2_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pap)
 133 {
 134         cpu_kcore_hdr_t *h = kd->cpu_data;
 135         struct sun2_kcore_hdr *s = &h->un._sun2;
 136         struct vmstate *v = kd->vmst;
 137         struct private_vmstate *pv = v->private;
 138         int pte, offset;
 139         u_int segnum, sme, ptenum;
 140         paddr_t pa;
 141
 142         if (ISALIVE(kd)) {
 143                 _kvm_err(kd, 0, "vatop called in live kernel!");
 144                 return(0);
 145         }
 146
 147         if (va < h->kernbase) {
 148                 _kvm_err(kd, 0, "not a kernel address");
 149                 return(0);
 150         }
 151
 152         /*
 153          * Get the segmap entry (sme) from the kernel segmap.
 154          * Note: only have segmap entries from KERNBASE to end.
 155          */
 156         segnum = _kvm_va_segnum(s, va - h->kernbase);
 157         ptenum = _kvm_va_pte_num(v, va);
 158         offset = va & v->pgofset;
 159
 160         /* The segmap entry selects a PMEG. */
 161         sme = s->ksegmap[segnum];
 162         pte = pv->pmeg[sme][ptenum];
 163
 164         if ((pte & (s)->pg_valid) == 0) {
 165                 _kvm_err(kd, 0, "page not valid (VA=0x%lx)", va);
 166                 return (0);
 167         }
 168         pa = _kvm_pg_pa(v, s, pte) + offset;
 169
 170         *pap = pa;
 171         return (h->page_size - offset);
 172 }
 173
 174 /*
 175  * Translate a physical address to a file-offset in the crash dump.
 176  */
 177 off_t
 178 _kvm_sun2_pa2off(kvm_t *kd, paddr_t pa)
 179 {
 180         return(kd->dump_off + pa);
 181 }