131 lines
3.9 KiB
C
131 lines
3.9 KiB
C
/* $NetBSD: kvm_i386pae.c,v 1.3 2020/04/25 05:17:16 maxv Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2010 Jean-Yves Migeon.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__RCSID("$NetBSD: kvm_i386pae.c,v 1.3 2020/04/25 05:17:16 maxv Exp $");
|
|
|
|
/*
|
|
* This will expose PAE functions, macros, definitions and constants.
|
|
* Note: this affects all virtual memory related functions. Only their
|
|
* PAE versions can be used below.
|
|
*/
|
|
#define PAE
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/kcore.h>
|
|
#include <sys/types.h>
|
|
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <nlist.h>
|
|
#include <kvm.h>
|
|
|
|
#include <uvm/uvm_extern.h>
|
|
|
|
#include <limits.h>
|
|
#include <db.h>
|
|
|
|
#include "kvm_private.h"
|
|
|
|
#include <i386/kcore.h>
|
|
#include <i386/pmap.h>
|
|
#include <i386/pte.h>
|
|
#include <i386/vmparam.h>
|
|
|
|
int _kvm_kvatop_i386pae(kvm_t *, vaddr_t, paddr_t *);
|
|
|
|
/*
|
|
* Used to translate a virtual address to a physical address for systems
|
|
* running under PAE mode. Three levels of virtual memory pages are handled
|
|
* here: the per-CPU L3 page, the 4 L2 PDs and the PTs.
|
|
*/
|
|
int
|
|
_kvm_kvatop_i386pae(kvm_t *kd, vaddr_t va, paddr_t *pa)
|
|
{
|
|
cpu_kcore_hdr_t *cpu_kh;
|
|
u_long page_off;
|
|
pd_entry_t pde;
|
|
pt_entry_t pte;
|
|
paddr_t pde_pa, pte_pa;
|
|
|
|
cpu_kh = kd->cpu_data;
|
|
page_off = va & PGOFSET;
|
|
|
|
/*
|
|
* Find and read the PDE. Ignore the L3, as it is only a per-CPU
|
|
* page, not needed for kernel VA => PA translations.
|
|
* Remember that the 4 L2 pages are contiguous, so it is safe
|
|
* to increment pdppaddr to compute the address of the PDE.
|
|
* pdppaddr being PAGE_SIZE aligned, we mask the option bits.
|
|
*/
|
|
pde_pa = (cpu_kh->pdppaddr & PTE_FRAME) + (pl2_pi(va) * sizeof(pde));
|
|
if (_kvm_pread(kd, kd->pmfd, (void *)&pde, sizeof(pde),
|
|
_kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
|
|
_kvm_syserr(kd, 0, "could not read PDE");
|
|
goto lose;
|
|
}
|
|
|
|
/*
|
|
* Find and read the page table entry.
|
|
*/
|
|
if ((pde & PTE_P) == 0) {
|
|
_kvm_err(kd, 0, "invalid translation (invalid PDE)");
|
|
goto lose;
|
|
}
|
|
if ((pde & PTE_PS) != 0) {
|
|
/*
|
|
* This is a 2MB page.
|
|
*/
|
|
page_off = va & ((vaddr_t)~PTE_LGFRAME);
|
|
*pa = (pde & PTE_LGFRAME) + page_off;
|
|
return (int)(NBPD_L2 - page_off);
|
|
}
|
|
|
|
pte_pa = (pde & PTE_FRAME) + (pl1_pi(va) * sizeof(pt_entry_t));
|
|
if (_kvm_pread(kd, kd->pmfd, (void *) &pte, sizeof(pte),
|
|
_kvm_pa2off(kd, pte_pa)) != sizeof(pte)) {
|
|
_kvm_syserr(kd, 0, "could not read PTE");
|
|
goto lose;
|
|
}
|
|
|
|
/*
|
|
* Validate the PTE and return the physical address.
|
|
*/
|
|
if ((pte & PTE_P) == 0) {
|
|
_kvm_err(kd, 0, "invalid translation (invalid PTE)");
|
|
goto lose;
|
|
}
|
|
*pa = (pte & PTE_FRAME) + page_off;
|
|
return (int)(NBPG - page_off);
|
|
|
|
lose:
|
|
*pa = (paddr_t)~0L;
|
|
return 0;
|
|
|
|
}
|