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Annotation of src/lib/libkvm/kvm_i386.c, Revision 1.21.16.2

1.21.16.2! matt        1: /*     $NetBSD$        */
1.9       thorpej     2:
1.1       cgd         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.
1.20      agc        19:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        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:
1.11      mikel      36: #include <sys/cdefs.h>
1.1       cgd        37: #if defined(LIBC_SCCS) && !defined(lint)
1.9       thorpej    38: #if 0
                     39: static char sccsid[] = "@(#)kvm_hp300.c        8.1 (Berkeley) 6/4/93";
                     40: #else
1.21.16.2! matt       41: __RCSID("$NetBSD$");
1.9       thorpej    42: #endif
1.1       cgd        43: #endif /* LIBC_SCCS and not lint */
                     44:
                     45: /*
1.12      thorpej    46:  * i386 machine dependent routines for kvm.
1.1       cgd        47:  */
                     48:
                     49: #include <sys/param.h>
                     50: #include <sys/user.h>
                     51: #include <sys/stat.h>
1.12      thorpej    52: #include <sys/kcore.h>
                     53: #include <machine/kcore.h>
1.6       cgd        54: #include <stdlib.h>
1.1       cgd        55: #include <unistd.h>
                     56: #include <nlist.h>
                     57: #include <kvm.h>
                     58:
1.17      mrg        59: #include <uvm/uvm_extern.h>
1.1       cgd        60:
                     61: #include <limits.h>
                     62: #include <db.h>
                     63:
                     64: #include "kvm_private.h"
                     65:
1.18      matt       66: #include <machine/pmap.h>
1.1       cgd        67: #include <machine/pte.h>
1.18      matt       68: #include <machine/vmparam.h>
1.1       cgd        69:
                     70: #ifndef btop
                     71: #define        btop(x)         (((unsigned)(x)) >> PGSHIFT)    /* XXX */
                     72: #define        ptob(x)         ((caddr_t)((x) << PGSHIFT))     /* XXX */
                     73: #endif
                     74:
                     75: void
                     76: _kvm_freevtop(kd)
                     77:        kvm_t *kd;
                     78: {
                     79:
1.12      thorpej    80:        /* Not actually used for anything right now, but safe. */
                     81:        if (kd->vmst != 0)
1.1       cgd        82:                free(kd->vmst);
                     83: }
                     84:
1.14      christos   85: /*ARGSUSED*/
1.1       cgd        86: int
                     87: _kvm_initvtop(kd)
                     88:        kvm_t *kd;
                     89: {
1.8       mycroft    90:
1.1       cgd        91:        return (0);
                     92: }
                     93:
                     94: /*
                     95:  * Translate a kernel virtual address to a physical address.
                     96:  */
                     97: int
                     98: _kvm_kvatop(kd, va, pa)
                     99:        kvm_t *kd;
                    100:        u_long va;
                    101:        u_long *pa;
                    102: {
1.12      thorpej   103:        cpu_kcore_hdr_t *cpu_kh;
1.14      christos  104:        u_long page_off;
1.12      thorpej   105:        pd_entry_t pde;
1.6       cgd       106:        pt_entry_t pte;
1.12      thorpej   107:        u_long pde_pa, pte_pa;
1.1       cgd       108:
                    109:        if (ISALIVE(kd)) {
                    110:                _kvm_err(kd, 0, "vatop called in live kernel!");
1.12      thorpej   111:                return (0);
1.1       cgd       112:        }
1.6       cgd       113:
1.12      thorpej   114:        cpu_kh = kd->cpu_data;
                    115:        page_off = va & PGOFSET;
                    116:
                    117:        /*
                    118:         * Find and read the page directory entry.
                    119:         */
1.21.16.2! matt      120:        pde_pa = cpu_kh->pdppaddr + (pl2_pi(va) * sizeof(pd_entry_t));
1.14      christos  121:        if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
                    122:            _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
1.12      thorpej   123:                _kvm_syserr(kd, 0, "could not read PDE");
                    124:                goto lose;
                    125:        }
                    126:
                    127:        /*
                    128:         * Find and read the page table entry.
                    129:         */
                    130:        if ((pde & PG_V) == 0) {
                    131:                _kvm_err(kd, 0, "invalid translation (invalid PDE)");
                    132:                goto lose;
                    133:        }
1.21.16.2! matt      134:        if ((pde & PG_PS) != 0) {
        !           135:                /*
        !           136:                 * This is a 4MB page.
        !           137:                 */
        !           138:                page_off = va & ~PG_LGFRAME;
        !           139:                *pa = (pde & PG_LGFRAME) + page_off;
        !           140:                return (int)(NBPD_L2 - page_off);
        !           141:        }
        !           142:        pte_pa = (pde & PG_FRAME) + (pl1_pi(va) * sizeof(pt_entry_t));
1.14      christos  143:        if (pread(kd->pmfd, (void *) &pte, sizeof(pte),
                    144:            _kvm_pa2off(kd, pte_pa)) != sizeof(pte)) {
1.12      thorpej   145:                _kvm_syserr(kd, 0, "could not read PTE");
                    146:                goto lose;
                    147:        }
                    148:
                    149:        /*
                    150:         * Validate the PTE and return the physical address.
                    151:         */
                    152:        if ((pte & PG_V) == 0) {
                    153:                _kvm_err(kd, 0, "invalid translation (invalid PTE)");
                    154:                goto lose;
                    155:        }
                    156:        *pa = (pte & PG_FRAME) + page_off;
1.14      christos  157:        return (int)(NBPG - page_off);
1.6       cgd       158:
1.12      thorpej   159:  lose:
1.14      christos  160:        *pa = (u_long)~0L;
1.12      thorpej   161:        return (0);
                    162: }
                    163:
                    164: /*
                    165:  * Translate a physical address to a file-offset in the crash dump.
                    166:  */
                    167: off_t
                    168: _kvm_pa2off(kd, pa)
                    169:        kvm_t *kd;
                    170:        u_long pa;
                    171: {
                    172:        cpu_kcore_hdr_t *cpu_kh;
1.15      simonb    173:        phys_ram_seg_t *ramsegs;
1.12      thorpej   174:        off_t off;
                    175:        int i;
                    176:
                    177:        cpu_kh = kd->cpu_data;
1.14      christos  178:        ramsegs = (void *)((char *)(void *)cpu_kh + ALIGN(sizeof *cpu_kh));
1.12      thorpej   179:
                    180:        off = 0;
                    181:        for (i = 0; i < cpu_kh->nmemsegs; i++) {
                    182:                if (pa >= ramsegs[i].start &&
                    183:                    (pa - ramsegs[i].start) < ramsegs[i].size) {
                    184:                        off += (pa - ramsegs[i].start);
                    185:                        break;
1.6       cgd       186:                }
1.12      thorpej   187:                off += ramsegs[i].size;
1.6       cgd       188:        }
                    189:
1.12      thorpej   190:        return (kd->dump_off + off);
1.10      gwr       191: }
                    192:
                    193: /*
                    194:  * Machine-dependent initialization for ALL open kvm descriptors,
                    195:  * not just those for a kernel crash dump.  Some architectures
                    196:  * have to deal with these NOT being constants!  (i.e. m68k)
                    197:  */
                    198: int
                    199: _kvm_mdopen(kd)
                    200:        kvm_t   *kd;
                    201: {
                    202:
                    203:        kd->usrstack = USRSTACK;
                    204:        kd->min_uva = VM_MIN_ADDRESS;
                    205:        kd->max_uva = VM_MAXUSER_ADDRESS;
                    206:
1.1       cgd       207:        return (0);
                    208: }

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