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      1 /*	$NetBSD: kvm_sun3x.c,v 1.12 2011/09/14 12:37:55 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Gordon W. Ross.
      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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 #if 0
     35 static char sccsid[] = "@(#)kvm_sparc.c	8.1 (Berkeley) 6/4/93";
     36 #else
     37 __RCSID("$NetBSD: kvm_sun3x.c,v 1.12 2011/09/14 12:37:55 christos Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 /*
     42  * Sun3x machine dependent routines for kvm.
     43  *
     44  * Note: This file has to build on ALL m68k machines,
     45  * so do NOT include any <machine / *.h> files here.
     46  */
     47 #include <sys/param.h>
     48 #include <sys/types.h>
     49 #include <sys/kcore.h>
     50 
     51 #include <unistd.h>
     52 #include <limits.h>
     53 #include <nlist.h>
     54 #include <kvm.h>
     55 #include <db.h>
     56 
     57 #include <m68k/kcore.h>
     58 
     59 #include "kvm_private.h"
     60 #include "kvm_m68k.h"
     61 
     62 int   _kvm_sun3x_initvtop(kvm_t *);
     63 void  _kvm_sun3x_freevtop(kvm_t *);
     64 int   _kvm_sun3x_kvatop  (kvm_t *, vaddr_t, paddr_t *);
     65 off_t _kvm_sun3x_pa2off  (kvm_t *, paddr_t);
     66 
     67 struct kvm_ops _kvm_ops_sun3x = {
     68 	_kvm_sun3x_initvtop,
     69 	_kvm_sun3x_freevtop,
     70 	_kvm_sun3x_kvatop,
     71 	_kvm_sun3x_pa2off };
     72 
     73 #define	_kvm_kvas_size(h)	\
     74 	(-((h)->kernbase))
     75 #define	_kvm_nkptes(h, v)	\
     76 	(_kvm_kvas_size((h)) >> (v)->pgshift)
     77 #define	_kvm_pg_pa(pte, h)	\
     78 	((pte) & (h)->pg_frame)
     79 
     80 /*
     81  * Prepare for translation of kernel virtual addresses into offsets
     82  * into crash dump files.  Nothing to do here.
     83  */
     84 int
     85 _kvm_sun3x_initvtop(kvm_t *kd)
     86 {
     87 	return 0;
     88 }
     89 
     90 void
     91 _kvm_sun3x_freevtop(kvm_t *kd)
     92 {
     93 }
     94 
     95 /*
     96  * Translate a kernel virtual address to a physical address using the
     97  * mapping information in kd->vm.  Returns the result in pa, and returns
     98  * the number of bytes that are contiguously available from this
     99  * physical address.  This routine is used only for crash dumps.
    100  */
    101 int
    102 _kvm_sun3x_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pap)
    103 {
    104 	cpu_kcore_hdr_t *h = kd->cpu_data;
    105 	struct sun3x_kcore_hdr *s = &h->un._sun3x;
    106 	struct vmstate *v = kd->vmst;
    107 	int idx, len, offset, pte;
    108 	u_long pteva, pa;
    109 
    110 	if (ISALIVE(kd)) {
    111 		_kvm_err(kd, 0, "vatop called in live kernel!");
    112 		return(0);
    113 	}
    114 
    115 	if (va < h->kernbase) {
    116 		_kvm_err(kd, 0, "not a kernel address");
    117 		return(0);
    118 	}
    119 
    120 	/*
    121 	 * If this VA is in the contiguous range, short-cut.
    122 	 * Note that this ends our recursion when we call
    123 	 * kvm_read to access the kernel page table, which
    124 	 * is guaranteed to be in the contiguous range.
    125 	 */
    126 	if (va < s->contig_end) {
    127 		len = s->contig_end - va;
    128 		pa = va - h->kernbase;
    129 		goto done;
    130 	}
    131 
    132 	/*
    133 	 * The KVA is beyond the contiguous range, so we must
    134 	 * read the PTE for this KVA from the page table.
    135 	 */
    136 	idx = ((va - h->kernbase) >> v->pgshift);
    137 	pteva = s->kernCbase + (idx * 4);
    138 	if (kvm_read(kd, pteva, &pte, 4) != 4) {
    139 		_kvm_err(kd, 0, "can not read PTE!");
    140 		return (0);
    141 	}
    142 	if ((pte & s->pg_valid) == 0) {
    143 		_kvm_err(kd, 0, "page not valid (VA=0x%lx)", va);
    144 		return (0);
    145 	}
    146 	offset = va & v->pgofset;
    147 	len = (h->page_size - offset);
    148 	pa = _kvm_pg_pa(pte, s) + offset;
    149 
    150 done:
    151 	*pap = pa;
    152 	return (len);
    153 }
    154 
    155 /*
    156  * Translate a physical address to a file-offset in the crash dump.
    157  */
    158 off_t
    159 _kvm_sun3x_pa2off(kvm_t *kd, paddr_t pa)
    160 {
    161 	off_t		off;
    162 	phys_ram_seg_t	*rsp;
    163 	cpu_kcore_hdr_t *h = kd->cpu_data;
    164 	struct sun3x_kcore_hdr *s = &h->un._sun3x;
    165 
    166 	off = 0;
    167 	for (rsp = s->ram_segs; rsp->size; rsp++) {
    168 		if (pa >= rsp->start && pa < rsp->start + rsp->size) {
    169 			pa -= rsp->start;
    170 			break;
    171 		}
    172 		off += rsp->size;
    173 	}
    174 	return (kd->dump_off + off + pa);
    175 }
    176 
    177