/* $OpenBSD: kvm_mips64.c,v 1.17 2021/12/01 16:53:28 deraadt Exp $ */ /* $NetBSD: kvm_mips.c,v 1.3 1996/03/18 22:33:44 thorpej Exp $ */ /*- * Copyright (c) 1989, 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software developed by the Computer Systems * Engineering group at Lawrence Berkeley Laboratory under DARPA contract * BG 91-66 and contributed to Berkeley. Modified for MIPS by Ralph Campbell. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * MIPS machine dependent routines for kvm. Hopefully, the forthcoming * vm code will one day obsolete this module. */ #include <sys/types.h> #include <sys/signal.h> #include <sys/proc.h> #include <sys/stat.h> #include <sys/sysctl.h> #include <unistd.h> #include <stdlib.h> #include <nlist.h> #include <kvm.h> #include <limits.h> #include <db.h> #include "kvm_private.h" #include <machine/cpu.h> #include <machine/pte.h> #include <machine/pmap.h> #include <uvm/uvm_extern.h> struct vmstate { pt_entry_t *Sysmap; u_int Sysmapsize; vaddr_t Sysmapbase; int pagesize; int pagemask; int pageshift; }; void _kvm_freevtop(kvm_t *kd) { free(kd->vmst); kd->vmst = NULL; } int _kvm_initvtop(kvm_t *kd) { struct vmstate *vm; struct nlist nl[4]; struct uvmexp uvmexp; vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm)); if (vm == 0) return (-1); kd->vmst = vm; nl[0].n_name = "Sysmap"; nl[1].n_name = "Sysmapsize"; nl[2].n_name = "uvmexp"; nl[3].n_name = 0; if (kvm_nlist(kd, nl) != 0) { _kvm_err(kd, kd->program, "bad namelist"); return (-1); } if (KREAD(kd, (u_long)nl[0].n_value, &vm->Sysmap)) { _kvm_err(kd, kd->program, "cannot read Sysmap"); return (-1); } if (KREAD(kd, (u_long)nl[1].n_value, &vm->Sysmapsize)) { _kvm_err(kd, kd->program, "cannot read Sysmapsize"); return (-1); } /* * We are only interested in the first three fields of struct * uvmexp, so do not try to read more than necessary (especially * in case the layout changes). */ if (kvm_read(kd, (u_long)nl[2].n_value, &uvmexp, 3 * sizeof(int)) != 3 * sizeof(int)) { _kvm_err(kd, kd->program, "cannot read uvmexp"); return (-1); } vm->pagesize = uvmexp.pagesize; vm->pagemask = uvmexp.pagemask; vm->pageshift = uvmexp.pageshift; /* * Older kernels might not have this symbol; in which case * we use the value of VM_MIN_KERNEL_ADDRESS they must have. */ nl[0].n_name = "Sysmapbase"; nl[1].n_name = 0; if (kvm_nlist(kd, nl) != 0 || KREAD(kd, (u_long)nl[0].n_value, &vm->Sysmapbase)) vm->Sysmapbase = (vaddr_t)CKSSEG_BASE; return (0); } /* * Translate a kernel virtual address to a physical address. */ int _kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa) { struct vmstate *vm; pt_entry_t pte; u_long idx, addr; int offset; if (ISALIVE(kd)) { _kvm_err(kd, 0, "vatop called in live kernel!"); return((off_t)0); } vm = kd->vmst; offset = (int)va & vm->pagemask; /* * If we are initializing (kernel segment table pointer not yet set) * then return pa == va to avoid infinite recursion. */ if (vm->Sysmap == 0) { *pa = va; return vm->pagesize - offset; } /* * Check for direct-mapped segments */ if (IS_XKPHYS(va)) { *pa = XKPHYS_TO_PHYS(va); return vm->pagesize - offset; } if (va >= (vaddr_t)CKSEG0_BASE && va < (vaddr_t)CKSSEG_BASE) { *pa = CKSEG0_TO_PHYS(va); return vm->pagesize - offset; } if (va < vm->Sysmapbase) goto invalid; idx = (va - vm->Sysmapbase) >> vm->pageshift; if (idx >= vm->Sysmapsize) goto invalid; addr = (u_long)vm->Sysmap + idx; /* * Can't use KREAD to read kernel segment table entries. * Fortunately it is 1-to-1 mapped so we don't have to. */ if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte), (off_t)addr) < 0) goto invalid; if (!(pte & PG_V)) goto invalid; *pa = (pte & PG_FRAME) | (paddr_t)offset; return vm->pagesize - offset; invalid: _kvm_err(kd, 0, "invalid address (%lx)", va); return (0); } off_t _kvm_pa2off(kvm_t *kd, paddr_t pa) { _kvm_err(kd, 0, "pa2off going to be implemented!"); return 0; }
