diff options
Diffstat (limited to 'lib/libkvm/kvm_i386.c')
| -rw-r--r-- | lib/libkvm/kvm_i386.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/lib/libkvm/kvm_i386.c b/lib/libkvm/kvm_i386.c new file mode 100644 index 0000000..d36b922 --- /dev/null +++ b/lib/libkvm/kvm_i386.c @@ -0,0 +1,194 @@ +/*- + * 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. + * + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93"; +#endif /* LIBC_SCCS and not lint */ + +/* + * i386 machine dependent routines for kvm. Hopefully, the forthcoming + * vm code will one day obsolete this module. + */ + +#include <sys/param.h> +#include <sys/user.h> +#include <sys/proc.h> +#include <sys/stat.h> +#include <stdlib.h> +#include <unistd.h> +#include <nlist.h> +#include <kvm.h> + +#include <vm/vm.h> +#include <vm/vm_param.h> + +#include <limits.h> +#include <db.h> + +#include "kvm_private.h" + +#ifndef btop +#define btop(x) (i386_btop(x)) +#define ptob(x) (i386_ptob(x)) +#endif + +struct vmstate { + pd_entry_t *PTD; +}; + +void +_kvm_freevtop(kvm_t *kd) +{ + if (kd->vmst != 0) { + if (kd->vmst->PTD) { + free(kd->vmst->PTD); + } + free(kd->vmst); + } +} + +int +_kvm_initvtop(kvm_t *kd) +{ + struct vmstate *vm; + struct nlist nlist[2]; + u_long pa; + pd_entry_t *PTD; + + vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm)); + if (vm == 0) { + _kvm_err(kd, kd->program, "cannot allocate vm"); + return (-1); + } + kd->vmst = vm; + vm->PTD = 0; + + nlist[0].n_name = "_IdlePTD"; + nlist[1].n_name = 0; + + if (kvm_nlist(kd, nlist) != 0) { + _kvm_err(kd, kd->program, "bad namelist"); + return (-1); + } + if (kvm_read(kd, (nlist[0].n_value - KERNBASE), &pa, sizeof(pa)) != sizeof(pa)) { + _kvm_err(kd, kd->program, "cannot read IdlePTD"); + return (-1); + } + PTD = _kvm_malloc(kd, PAGE_SIZE); + if (kvm_read(kd, pa, PTD, PAGE_SIZE) != PAGE_SIZE) { + _kvm_err(kd, kd->program, "cannot read PTD"); + return (-1); + } + vm->PTD = PTD; + return (0); +} + +static int +_kvm_vatop(kvm_t *kd, u_long va, u_long *pa) +{ + struct vmstate *vm; + u_long offset; + u_long pte_pa; + pd_entry_t pde; + pt_entry_t pte; + u_long pdeindex; + u_long pteindex; + int i; + + if (ISALIVE(kd)) { + _kvm_err(kd, 0, "vatop called in live kernel!"); + return((off_t)0); + } + + vm = kd->vmst; + offset = va & (PAGE_SIZE - 1); + + /* + * If we are initializing (kernel page table descriptor pointer + * not yet set) then return pa == va to avoid infinite recursion. + */ + if (vm->PTD == 0) { + *pa = va; + return (PAGE_SIZE - offset); + } + + pdeindex = va >> PDRSHIFT; + pde = vm->PTD[pdeindex]; + if (((u_long)pde & PG_V) == 0) + goto invalid; + + if ((u_long)pde & PG_PS) { + /* + * No second-level page table; ptd describes one 4MB page. + * (We assume that the kernel wouldn't set PG_PS without enabling + * it cr0, and that the kernel doesn't support 36-bit physical + * addresses). + */ +#define PAGE4M_MASK (NBPDR - 1) +#define PG_FRAME4M (~PAGE4M_MASK) + *pa = ((u_long)pde & PG_FRAME4M) + (va & PAGE4M_MASK); + return (NBPDR - (va & PAGE4M_MASK)); + } + + pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1); + pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pt_entry_t)); + + /* XXX This has to be a physical address read, kvm_read is virtual */ + if (lseek(kd->pmfd, pte_pa, 0) == -1) { + _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek"); + goto invalid; + } + if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) { + _kvm_syserr(kd, kd->program, "_kvm_vatop: read"); + goto invalid; + } + if (((u_long)pte & PG_V) == 0) + goto invalid; + + *pa = ((u_long)pte & PG_FRAME) + offset; + return (PAGE_SIZE - offset); + +invalid: + _kvm_err(kd, 0, "invalid address (%x)", va); + return (0); +} + +int +_kvm_kvatop(kvm_t *kd, u_long va, u_long *pa) +{ + return (_kvm_vatop(kd, va, pa)); +} |
