kvm_sparc.c revision 147672
11573Srgrimes/*- 21573Srgrimes * Copyright (c) 1992, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * This code is derived from software developed by the Computer Systems 61573Srgrimes * Engineering group at Lawrence Berkeley Laboratory under DARPA contract 71573Srgrimes * BG 91-66 and contributed to Berkeley. 81573Srgrimes * 91573Srgrimes * Redistribution and use in source and binary forms, with or without 101573Srgrimes * modification, are permitted provided that the following conditions 111573Srgrimes * are met: 121573Srgrimes * 1. Redistributions of source code must retain the above copyright 131573Srgrimes * notice, this list of conditions and the following disclaimer. 141573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 151573Srgrimes * notice, this list of conditions and the following disclaimer in the 161573Srgrimes * documentation and/or other materials provided with the distribution. 171573Srgrimes * 3. All advertising materials mentioning features or use of this software 181573Srgrimes * must display the following acknowledgement: 191573Srgrimes * This product includes software developed by the University of 201573Srgrimes * California, Berkeley and its contributors. 211573Srgrimes * 4. Neither the name of the University nor the names of its contributors 221573Srgrimes * may be used to endorse or promote products derived from this software 231573Srgrimes * without specific prior written permission. 241573Srgrimes * 251573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 261573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 271573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 281573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 291573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 301573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 311573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 321573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 331573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 341573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 351573Srgrimes * SUCH DAMAGE. 361573Srgrimes */ 371573Srgrimes 3883551Sdillon#include <sys/cdefs.h> 3983551Sdillon__FBSDID("$FreeBSD: head/lib/libkvm/kvm_sparc.c 147672 2005-06-29 22:39:41Z peter $"); 4083551Sdillon 411573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 4255127Speter#if 0 431573Srgrimesstatic char sccsid[] = "@(#)kvm_sparc.c 8.1 (Berkeley) 6/4/93"; 4455127Speter#endif 451573Srgrimes#endif /* LIBC_SCCS and not lint */ 461573Srgrimes 471573Srgrimes/* 488870Srgrimes * Sparc machine dependent routines for kvm. Hopefully, the forthcoming 491573Srgrimes * vm code will one day obsolete this module. 501573Srgrimes */ 511573Srgrimes 521573Srgrimes#include <sys/param.h> 531573Srgrimes#include <sys/user.h> 541573Srgrimes#include <sys/proc.h> 551573Srgrimes#include <sys/stat.h> 561573Srgrimes#include <unistd.h> 571573Srgrimes#include <nlist.h> 581573Srgrimes#include <kvm.h> 591573Srgrimes 601573Srgrimes#include <vm/vm.h> 611573Srgrimes#include <vm/vm_param.h> 621573Srgrimes 631573Srgrimes#include <limits.h> 641573Srgrimes 651573Srgrimes#include "kvm_private.h" 661573Srgrimes 671573Srgrimes#define NPMEG 128 681573Srgrimes 691573Srgrimes/* XXX from sparc/pmap.c */ 701573Srgrimes#define MAXMEM (128 * 1024 * 1024) /* no more than 128 MB phys mem */ 711573Srgrimes#define NPGBANK 16 /* 2^4 pages per bank (64K / bank) */ 721573Srgrimes#define BSHIFT 4 /* log2(NPGBANK) */ 731573Srgrimes#define BOFFSET (NPGBANK - 1) 741573Srgrimes#define BTSIZE (MAXMEM / NBPG / NPGBANK) 751573Srgrimes#define HWTOSW(pmap_stod, pg) (pmap_stod[(pg) >> BSHIFT] | ((pg) & BOFFSET)) 761573Srgrimes 771573Srgrimesstruct vmstate { 781573Srgrimes pmeg_t segmap[NKSEG]; 791573Srgrimes int pmeg[NPMEG][NPTESG]; 801573Srgrimes int pmap_stod[BTSIZE]; /* dense to sparse */ 811573Srgrimes}; 821573Srgrimes 831573Srgrimesvoid 841573Srgrimes_kvm_freevtop(kd) 851573Srgrimes kvm_t *kd; 861573Srgrimes{ 871573Srgrimes if (kd->vmst != 0) 881573Srgrimes free(kd->vmst); 891573Srgrimes} 901573Srgrimes 911573Srgrimesint 921573Srgrimes_kvm_initvtop(kd) 931573Srgrimes kvm_t *kd; 941573Srgrimes{ 9592913Sobrien int i; 9692913Sobrien int off; 9792913Sobrien struct vmstate *vm; 981573Srgrimes struct stat st; 991573Srgrimes struct nlist nlist[2]; 1001573Srgrimes 1011573Srgrimes vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm)); 1021573Srgrimes if (vm == 0) 1031573Srgrimes return (-1); 1041573Srgrimes 1051573Srgrimes kd->vmst = vm; 1061573Srgrimes 1071573Srgrimes if (fstat(kd->pmfd, &st) < 0) 1081573Srgrimes return (-1); 1091573Srgrimes /* 1101573Srgrimes * Read segment table. 1111573Srgrimes */ 1121573Srgrimes off = st.st_size - ctob(btoc(sizeof(vm->segmap))); 1131573Srgrimes errno = 0; 1148870Srgrimes if (lseek(kd->pmfd, (off_t)off, 0) == -1 && errno != 0 || 1151573Srgrimes read(kd->pmfd, (char *)vm->segmap, sizeof(vm->segmap)) < 0) { 1161573Srgrimes _kvm_err(kd, kd->program, "cannot read segment map"); 1171573Srgrimes return (-1); 1181573Srgrimes } 1191573Srgrimes /* 1201573Srgrimes * Read PMEGs. 1211573Srgrimes */ 1221573Srgrimes off = st.st_size - ctob(btoc(sizeof(vm->pmeg)) + 1231573Srgrimes btoc(sizeof(vm->segmap))); 1241573Srgrimes errno = 0; 1258870Srgrimes if (lseek(kd->pmfd, (off_t)off, 0) == -1 && errno != 0 || 1261573Srgrimes read(kd->pmfd, (char *)vm->pmeg, sizeof(vm->pmeg)) < 0) { 1271573Srgrimes _kvm_err(kd, kd->program, "cannot read PMEG table"); 1281573Srgrimes return (-1); 1291573Srgrimes } 1301573Srgrimes /* 1311573Srgrimes * Make pmap_stod be an identity map so we can bootstrap it in. 1321573Srgrimes * We assume it's in the first contiguous chunk of physical memory. 1331573Srgrimes */ 1348870Srgrimes for (i = 0; i < BTSIZE; ++i) 1351573Srgrimes vm->pmap_stod[i] = i << 4; 1361573Srgrimes 1371573Srgrimes /* 1381573Srgrimes * It's okay to do this nlist separately from the one kvm_getprocs() 1391573Srgrimes * does, since the only time we could gain anything by combining 1401573Srgrimes * them is if we do a kvm_getprocs() on a dead kernel, which is 1411573Srgrimes * not too common. 1421573Srgrimes */ 1431573Srgrimes nlist[0].n_name = "_pmap_stod"; 1441573Srgrimes nlist[1].n_name = 0; 1451573Srgrimes if (kvm_nlist(kd, nlist) != 0) { 1461573Srgrimes _kvm_err(kd, kd->program, "pmap_stod: no such symbol"); 1471573Srgrimes return (-1); 1481573Srgrimes } 1498870Srgrimes if (kvm_read(kd, (u_long)nlist[0].n_value, 1501573Srgrimes (char *)vm->pmap_stod, sizeof(vm->pmap_stod)) 1511573Srgrimes != sizeof(vm->pmap_stod)) { 1521573Srgrimes _kvm_err(kd, kd->program, "cannot read pmap_stod"); 1531573Srgrimes return (-1); 1541573Srgrimes } 1551573Srgrimes return (0); 1561573Srgrimes} 1571573Srgrimes 1581573Srgrimes#define VA_OFF(va) (va & (NBPG - 1)) 1591573Srgrimes 1601573Srgrimes/* 1611573Srgrimes * Translate a user virtual address to a physical address. 1621573Srgrimes */ 1631573Srgrimesint 1641573Srgrimes_kvm_uvatop(kd, p, va, pa) 1651573Srgrimes kvm_t *kd; 1661573Srgrimes const struct proc *p; 1671573Srgrimes u_long va; 1681573Srgrimes u_long *pa; 1691573Srgrimes{ 1701573Srgrimes int kva, pte; 17192913Sobrien int off, frame; 17292913Sobrien struct vmspace *vms = p->p_vmspace; 1731573Srgrimes 1741573Srgrimes if ((u_long)vms < KERNBASE) { 1751573Srgrimes _kvm_err(kd, kd->program, "_kvm_uvatop: corrupt proc"); 1761573Srgrimes return (0); 1771573Srgrimes } 1781573Srgrimes if (va >= KERNBASE) 1791573Srgrimes return (0); 1801573Srgrimes /* 1811573Srgrimes * Get the PTE. This takes two steps. We read the 1821573Srgrimes * base address of the table, then we index it. 1831573Srgrimes * Note that the index pte table is indexed by 1841573Srgrimes * virtual segment rather than physical segment. 1851573Srgrimes */ 1861573Srgrimes kva = (u_long)&vms->vm_pmap.pm_rpte[VA_VSEG(va)]; 1871573Srgrimes if (kvm_read(kd, kva, (char *)&kva, 4) != 4 || kva == 0) 1881573Srgrimes goto invalid; 1891573Srgrimes kva += sizeof(vms->vm_pmap.pm_rpte[0]) * VA_VPG(va); 1901573Srgrimes if (kvm_read(kd, kva, (char *)&pte, 4) == 4 && (pte & PG_V)) { 1911573Srgrimes off = VA_OFF(va); 1921573Srgrimes /* 1931573Srgrimes * /dev/mem adheres to the hardware model of physical memory 1941573Srgrimes * (with holes in the address space), while crashdumps 1951573Srgrimes * adhere to the contiguous software model. 1961573Srgrimes */ 1971573Srgrimes if (ISALIVE(kd)) 1981573Srgrimes frame = pte & PG_PFNUM; 1991573Srgrimes else 2001573Srgrimes frame = HWTOSW(kd->vmst->pmap_stod, pte & PG_PFNUM); 2018870Srgrimes *pa = (frame << PGSHIFT) | off; 2021573Srgrimes return (NBPG - off); 2031573Srgrimes } 2041573Srgrimesinvalid: 2051573Srgrimes _kvm_err(kd, 0, "invalid address (%x)", va); 2061573Srgrimes return (0); 2071573Srgrimes} 2081573Srgrimes 2091573Srgrimes/* 2101573Srgrimes * Translate a kernel virtual address to a physical address using the 2111573Srgrimes * mapping information in kd->vm. Returns the result in pa, and returns 2128870Srgrimes * the number of bytes that are contiguously available from this 2131573Srgrimes * physical address. This routine is used only for crashdumps. 2141573Srgrimes */ 2151573Srgrimesint 2161573Srgrimes_kvm_kvatop(kd, va, pa) 2171573Srgrimes kvm_t *kd; 2181573Srgrimes u_long va; 219147672Speter uint64_t *pa; 2201573Srgrimes{ 22192913Sobrien struct vmstate *vm; 22292913Sobrien int s; 22392913Sobrien int pte; 22492913Sobrien int off; 2251573Srgrimes 2261573Srgrimes if (va >= KERNBASE) { 2271573Srgrimes vm = kd->vmst; 2281573Srgrimes s = vm->segmap[VA_VSEG(va) - NUSEG]; 2291573Srgrimes pte = vm->pmeg[s][VA_VPG(va)]; 2301573Srgrimes if ((pte & PG_V) != 0) { 2311573Srgrimes off = VA_OFF(va); 2321573Srgrimes *pa = (HWTOSW(vm->pmap_stod, pte & PG_PFNUM) 2331573Srgrimes << PGSHIFT) | off; 2341573Srgrimes 2351573Srgrimes return (NBPG - off); 2361573Srgrimes } 2371573Srgrimes } 2381573Srgrimes _kvm_err(kd, 0, "invalid address (%x)", va); 2391573Srgrimes return (0); 2401573Srgrimes} 241