2 * Copyright (c) 1989, 1992, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software developed by the Computer Systems
6 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
7 * BG 91-66 and contributed to Berkeley.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 #if defined(LIBC_SCCS) && !defined(lint)
40 static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93";
42 static const char rcsid[] =
43 "$FreeBSD: src/lib/libkvm/kvm_i386.c,v 1.11.2.1 2001/09/21 04:01:51 peter Exp $";
45 #endif /* LIBC_SCCS and not lint */
48 * i386 machine dependent routines for kvm. Hopefully, the forthcoming
49 * vm code will one day obsolete this module.
52 #include <sys/param.h>
62 #include <vm/vm_param.h>
66 #include "kvm_private.h"
69 #define btop(x) (i386_btop(x))
70 #define ptob(x) (i386_ptob(x))
78 _kvm_freevtop(kvm_t *kd)
89 _kvm_initvtop(kvm_t *kd)
92 struct nlist nlist[2];
97 vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
99 _kvm_err(kd, kd->program, "cannot allocate vm");
105 nlist[0].n_name = "_kernbase";
108 if (kvm_nlist(kd, nlist) != 0)
109 kernbase = KERNBASE; /* for old kernels */
111 kernbase = nlist[0].n_value;
113 nlist[0].n_name = "_IdlePTD";
116 if (kvm_nlist(kd, nlist) != 0) {
117 _kvm_err(kd, kd->program, "bad namelist");
120 if (kvm_read(kd, (nlist[0].n_value - kernbase), &pa, sizeof(pa)) !=
122 _kvm_err(kd, kd->program, "cannot read IdlePTD");
125 PTD = _kvm_malloc(kd, PAGE_SIZE);
126 if (kvm_read(kd, pa, PTD, PAGE_SIZE) != PAGE_SIZE) {
127 _kvm_err(kd, kd->program, "cannot read PTD");
135 _kvm_vatop(kvm_t *kd, u_long va, u_long *pa)
147 _kvm_err(kd, 0, "vatop called in live kernel!");
152 offset = va & (PAGE_SIZE - 1);
155 * If we are initializing (kernel page table descriptor pointer
156 * not yet set) then return pa == va to avoid infinite recursion.
160 return (PAGE_SIZE - offset);
163 pdeindex = va >> PDRSHIFT;
164 pde = vm->PTD[pdeindex];
165 if (((u_long)pde & PG_V) == 0)
168 if ((u_long)pde & PG_PS) {
170 * No second-level page table; ptd describes one 4MB page.
171 * (We assume that the kernel wouldn't set PG_PS without enabling
172 * it cr0, and that the kernel doesn't support 36-bit physical
175 #define PAGE4M_MASK (NBPDR - 1)
176 #define PG_FRAME4M (~PAGE4M_MASK)
177 *pa = ((u_long)pde & PG_FRAME4M) + (va & PAGE4M_MASK);
178 return (NBPDR - (va & PAGE4M_MASK));
181 pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1);
182 pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pt_entry_t));
184 /* XXX This has to be a physical address read, kvm_read is virtual */
185 if (lseek(kd->pmfd, pte_pa, 0) == -1) {
186 _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek");
189 if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) {
190 _kvm_syserr(kd, kd->program, "_kvm_vatop: read");
193 if (((u_long)pte & PG_V) == 0)
196 *pa = ((u_long)pte & PG_FRAME) + offset;
197 return (PAGE_SIZE - offset);
200 _kvm_err(kd, 0, "invalid address (%x)", va);
205 _kvm_kvatop(kvm_t *kd, u_long va, u_long *pa)
207 return (_kvm_vatop(kd, va, pa));