/*-
* 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. 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.
*/
/*
* Indicates whether PAE is in use for the kernel image
* 0: native i386 memory mappings
* 1: i386 PAE mappings
*/
static int i386_use_pae;
int _kvm_kvatop_i386(kvm_t *, vaddr_t, paddr_t *);
int _kvm_kvatop_i386pae(kvm_t *, vaddr_t, paddr_t *);
void
_kvm_freevtop(kvm_t *kd)
{
/* Not actually used for anything right now, but safe. */
if (kd->vmst != 0)
free(kd->vmst);
}
/*ARGSUSED*/
int
_kvm_initvtop(kvm_t *kd)
{
cpu_kcore_hdr_t *cpu_kh = kd->cpu_data;
i386_use_pae = 0; /* default: non PAE mode */
if ((cpu_kh->pdppaddr & I386_KCORE_PAE) == I386_KCORE_PAE)
i386_use_pae = 1;
return 0;
}
/*
* Translate a kernel virtual address to a physical address.
*/
int
_kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa)
{
if (ISALIVE(kd)) {
_kvm_err(kd, 0, "vatop called in live kernel!");
return 0;
}
switch (i386_use_pae) {
default:
case 0:
return _kvm_kvatop_i386(kd, va, pa);
case 1:
return _kvm_kvatop_i386pae(kd, va, pa);
}
}
/*
* Used to translate a virtual address to a physical address for systems
* with PAE mode disabled. Only two levels of virtual memory pages are
* dereferenced (L2 PDEs, then L1 PTEs).
*/
int
_kvm_kvatop_i386(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 page directory entry.
* 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 4MB page.
*/
page_off = va & ~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;
}
/*
* Translate a physical address to a file-offset in the crash dump.
*/
off_t
_kvm_pa2off(kvm_t *kd, paddr_t pa)
{
cpu_kcore_hdr_t *cpu_kh;
phys_ram_seg_t *ramsegs;
off_t off;
int i;
off = 0;
for (i = 0; i < cpu_kh->nmemsegs; i++) {
if (pa >= ramsegs[i].start &&
(pa - ramsegs[i].start) < ramsegs[i].size) {
off += (pa - ramsegs[i].start);
break;
}
off += ramsegs[i].size;
}
return (kd->dump_off + off);
}
/*
* Machine-dependent initialization for ALL open kvm descriptors,
* not just those for a kernel crash dump. Some architectures
* have to deal with these NOT being constants! (i.e. m68k)
*/
int
_kvm_mdopen(kvm_t *kd)
{
