131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
/* $NetBSD: kvm_i386pae.c,v 1.2 2014/02/19 20:21:22 dsl Exp $ */
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/*
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* Copyright (c) 2010 Jean-Yves Migeon.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: kvm_i386pae.c,v 1.2 2014/02/19 20:21:22 dsl Exp $");
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/*
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* This will expose PAE functions, macros, definitions and constants.
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* Note: this affects all virtual memory related functions. Only their
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* PAE versions can be used below.
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*/
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#define PAE
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/kcore.h>
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#include <sys/types.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <nlist.h>
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#include <kvm.h>
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#include <uvm/uvm_extern.h>
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#include <limits.h>
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#include <db.h>
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#include "kvm_private.h"
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#include <i386/kcore.h>
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#include <i386/pmap.h>
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#include <i386/pte.h>
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#include <i386/vmparam.h>
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int _kvm_kvatop_i386pae(kvm_t *, vaddr_t, paddr_t *);
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/*
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* Used to translate a virtual address to a physical address for systems
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* running under PAE mode. Three levels of virtual memory pages are handled
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* here: the per-CPU L3 page, the 4 L2 PDs and the PTs.
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*/
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int
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_kvm_kvatop_i386pae(kvm_t *kd, vaddr_t va, paddr_t *pa)
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{
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cpu_kcore_hdr_t *cpu_kh;
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u_long page_off;
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pd_entry_t pde;
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pt_entry_t pte;
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paddr_t pde_pa, pte_pa;
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cpu_kh = kd->cpu_data;
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page_off = va & PGOFSET;
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/*
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* Find and read the PDE. Ignore the L3, as it is only a per-CPU
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* page, not needed for kernel VA => PA translations.
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* Remember that the 4 L2 pages are contiguous, so it is safe
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* to increment pdppaddr to compute the address of the PDE.
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* pdppaddr being PAGE_SIZE aligned, we mask the option bits.
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*/
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pde_pa = (cpu_kh->pdppaddr & PG_FRAME) + (pl2_pi(va) * sizeof(pde));
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if (_kvm_pread(kd, kd->pmfd, (void *)&pde, sizeof(pde),
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_kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
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_kvm_syserr(kd, 0, "could not read PDE");
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goto lose;
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}
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/*
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* Find and read the page table entry.
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*/
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if ((pde & PG_V) == 0) {
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_kvm_err(kd, 0, "invalid translation (invalid PDE)");
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goto lose;
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}
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if ((pde & PG_PS) != 0) {
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/*
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* This is a 2MB page.
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*/
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page_off = va & ((vaddr_t)~PG_LGFRAME);
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*pa = (pde & PG_LGFRAME) + page_off;
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return (int)(NBPD_L2 - page_off);
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}
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pte_pa = (pde & PG_FRAME) + (pl1_pi(va) * sizeof(pt_entry_t));
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if (_kvm_pread(kd, kd->pmfd, (void *) &pte, sizeof(pte),
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_kvm_pa2off(kd, pte_pa)) != sizeof(pte)) {
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_kvm_syserr(kd, 0, "could not read PTE");
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goto lose;
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}
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/*
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* Validate the PTE and return the physical address.
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*/
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if ((pte & PG_V) == 0) {
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_kvm_err(kd, 0, "invalid translation (invalid PTE)");
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goto lose;
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}
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*pa = (pte & PG_FRAME) + page_off;
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return (int)(NBPG - page_off);
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lose:
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*pa = (paddr_t)~0L;
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return 0;
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}
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