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Annotation of src/lib/libkvm/kvm_x86_64.c, Revision 1.5

1.5     ! fvdl        1: /*     $NetBSD: kvm_x86_64.c,v 1.4 2003/08/07 16:44:40 agc Exp $       */
1.1       fvdl        2:
                      3: /*-
                      4:  * Copyright (c) 1989, 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.
1.4       agc        19:  * 3. Neither the name of the University nor the names of its contributors
1.1       fvdl       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_hp300.c        8.1 (Berkeley) 6/4/93";
                     40: #else
1.5     ! fvdl       41: __RCSID("$NetBSD: kvm_x86_64.c,v 1.4 2003/08/07 16:44:40 agc Exp $");
1.1       fvdl       42: #endif
                     43: #endif /* LIBC_SCCS and not lint */
                     44:
                     45: /*
                     46:  * x86-64 machine dependent routines for kvm.
                     47:  */
                     48:
                     49: #include <sys/param.h>
                     50: #include <sys/user.h>
                     51: #include <sys/proc.h>
                     52: #include <sys/stat.h>
                     53: #include <sys/kcore.h>
                     54: #include <machine/kcore.h>
                     55: #include <stdlib.h>
                     56: #include <unistd.h>
                     57: #include <nlist.h>
                     58: #include <kvm.h>
                     59:
                     60: #include <uvm/uvm_extern.h>
                     61:
                     62: #include <limits.h>
                     63: #include <db.h>
                     64:
                     65: #include "kvm_private.h"
                     66:
1.2       matt       67: #include <machine/pmap.h>
1.1       fvdl       68: #include <machine/pte.h>
1.2       matt       69: #include <machine/vmparam.h>
1.1       fvdl       70:
                     71: void
                     72: _kvm_freevtop(kd)
                     73:        kvm_t *kd;
                     74: {
                     75:
                     76:        /* Not actually used for anything right now, but safe. */
                     77:        if (kd->vmst != 0)
                     78:                free(kd->vmst);
                     79: }
                     80:
                     81: /*ARGSUSED*/
                     82: int
                     83: _kvm_initvtop(kd)
                     84:        kvm_t *kd;
                     85: {
                     86:
                     87:        return (0);
                     88: }
                     89:
                     90: /*
                     91:  * Translate a kernel virtual address to a physical address.
                     92:  */
                     93: int
                     94: _kvm_kvatop(kd, va, pa)
                     95:        kvm_t *kd;
                     96:        u_long va;
                     97:        u_long *pa;
                     98: {
                     99:        cpu_kcore_hdr_t *cpu_kh;
                    100:        u_long page_off;
                    101:        pd_entry_t pde;
                    102:        pt_entry_t pte;
1.3       fvdl      103:        paddr_t pde_pa, pte_pa;
1.1       fvdl      104:
                    105:        if (ISALIVE(kd)) {
                    106:                _kvm_err(kd, 0, "vatop called in live kernel!");
                    107:                return (0);
                    108:        }
                    109:
                    110:        cpu_kh = kd->cpu_data;
                    111:        page_off = va & PGOFSET;
                    112:
                    113:        /*
1.3       fvdl      114:         * Find and read all entries to get to the pa.
                    115:         */
                    116:
                    117:        /*
                    118:         * Level 4.
                    119:         */
1.5     ! fvdl      120:        pde_pa = cpu_kh->ptdpaddr + (pl4_pi(va) * sizeof(pd_entry_t));
1.3       fvdl      121:        if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
                    122:            _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
                    123:                _kvm_syserr(kd, 0, "could not read PT level 4 entry");
                    124:                goto lose;
                    125:        }
                    126:        if ((pde & PG_V) == 0) {
                    127:                _kvm_err(kd, 0, "invalid translation (invalid level 4 PDE)");
                    128:                goto lose;
                    129:        }
                    130:
                    131:        /*
                    132:         * Level 3.
1.1       fvdl      133:         */
1.5     ! fvdl      134:        pde_pa = (pde & PG_FRAME) + (pl3_pi(va) * sizeof(pd_entry_t));
1.1       fvdl      135:        if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
                    136:            _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
1.3       fvdl      137:                _kvm_syserr(kd, 0, "could not read PT level 3 entry");
                    138:                goto lose;
                    139:        }
                    140:        if ((pde & PG_V) == 0) {
                    141:                _kvm_err(kd, 0, "invalid translation (invalid level 3 PDE)");
1.1       fvdl      142:                goto lose;
                    143:        }
                    144:
                    145:        /*
1.3       fvdl      146:         * Level 2.
1.1       fvdl      147:         */
1.5     ! fvdl      148:        pde_pa = (pde & PG_FRAME) + (pl2_pi(va) * sizeof(pd_entry_t));
1.3       fvdl      149:        if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
                    150:            _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
                    151:                _kvm_syserr(kd, 0, "could not read PT level 2 entry");
                    152:                goto lose;
                    153:        }
1.1       fvdl      154:        if ((pde & PG_V) == 0) {
1.3       fvdl      155:                _kvm_err(kd, 0, "invalid translation (invalid level 2 PDE)");
1.1       fvdl      156:                goto lose;
                    157:        }
1.3       fvdl      158:
                    159:
                    160:        /*
                    161:         * Level 1.
                    162:         */
1.5     ! fvdl      163:        pte_pa = (pde & PG_FRAME) + (pl1_pi(va) * sizeof(pt_entry_t));
1.1       fvdl      164:        if (pread(kd->pmfd, (void *) &pte, sizeof(pte),
                    165:            _kvm_pa2off(kd, pte_pa)) != sizeof(pte)) {
                    166:                _kvm_syserr(kd, 0, "could not read PTE");
                    167:                goto lose;
                    168:        }
                    169:        /*
                    170:         * Validate the PTE and return the physical address.
                    171:         */
                    172:        if ((pte & PG_V) == 0) {
                    173:                _kvm_err(kd, 0, "invalid translation (invalid PTE)");
                    174:                goto lose;
                    175:        }
                    176:        *pa = (pte & PG_FRAME) + page_off;
                    177:        return (int)(NBPG - page_off);
                    178:
                    179:  lose:
                    180:        *pa = (u_long)~0L;
                    181:        return (0);
                    182: }
                    183:
                    184: /*
                    185:  * Translate a physical address to a file-offset in the crash dump.
                    186:  */
                    187: off_t
                    188: _kvm_pa2off(kd, pa)
                    189:        kvm_t *kd;
                    190:        u_long pa;
                    191: {
                    192:        cpu_kcore_hdr_t *cpu_kh;
                    193:        phys_ram_seg_t *ramsegs;
                    194:        off_t off;
                    195:        int i;
                    196:
                    197:        cpu_kh = kd->cpu_data;
                    198:        ramsegs = (void *)((char *)(void *)cpu_kh + ALIGN(sizeof *cpu_kh));
                    199:
                    200:        off = 0;
                    201:        for (i = 0; i < cpu_kh->nmemsegs; i++) {
                    202:                if (pa >= ramsegs[i].start &&
                    203:                    (pa - ramsegs[i].start) < ramsegs[i].size) {
                    204:                        off += (pa - ramsegs[i].start);
                    205:                        break;
                    206:                }
                    207:                off += ramsegs[i].size;
                    208:        }
                    209:
                    210:        return (kd->dump_off + off);
                    211: }
                    212:
                    213: /*
                    214:  * Machine-dependent initialization for ALL open kvm descriptors,
                    215:  * not just those for a kernel crash dump.  Some architectures
                    216:  * have to deal with these NOT being constants!  (i.e. m68k)
                    217:  */
                    218: int
                    219: _kvm_mdopen(kd)
                    220:        kvm_t   *kd;
                    221: {
                    222:
                    223:        kd->usrstack = USRSTACK;
                    224:        kd->min_uva = VM_MIN_ADDRESS;
                    225:        kd->max_uva = VM_MAXUSER_ADDRESS;
                    226:
                    227:        return (0);
                    228: }

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