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/*-
* 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. Modified for MIPS by Ralph Campbell.
*
* 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_mips.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
/*
* MIPS 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 <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"
#include <machine/machConst.h>
#include <machine/pte.h>
#include <machine/pmap.h>
struct vmstate {
pt_entry_t *Sysmap;
u_int Sysmapsize;
};
#define KREAD(kd, addr, p)\
(kvm_read(kd, addr, (char *)(p), sizeof(*(p))) != sizeof(*(p)))
void
_kvm_freevtop(kd)
kvm_t *kd;
{
if (kd->vmst != 0)
free(kd->vmst);
}
int
_kvm_initvtop(kd)
kvm_t *kd;
{
struct vmstate *vm;
struct nlist nlist[3];
vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
if (vm == 0)
return (-1);
kd->vmst = vm;
nlist[0].n_name = "Sysmap";
nlist[1].n_name = "Sysmapsize";
nlist[2].n_name = 0;
if (kvm_nlist(kd, nlist) != 0) {
_kvm_err(kd, kd->program, "bad namelist");
return (-1);
}
if (KREAD(kd, (u_long)nlist[0].n_value, &vm->Sysmap)) {
_kvm_err(kd, kd->program, "cannot read Sysmap");
return (-1);
}
if (KREAD(kd, (u_long)nlist[1].n_value, &vm->Sysmapsize)) {
_kvm_err(kd, kd->program, "cannot read mmutype");
return (-1);
}
return (0);
}
/*
* Translate a kernel virtual address to a physical address.
*/
int
_kvm_kvatop(kd, va, pa)
kvm_t *kd;
u_long va;
u_long *pa;
{
register struct vmstate *vm;
u_long pte, addr, offset;
if (ISALIVE(kd)) {
_kvm_err(kd, 0, "vatop called in live kernel!");
return((off_t)0);
}
vm = kd->vmst;
offset = va & PGOFSET;
/*
* If we are initializing (kernel segment table pointer not yet set)
* then return pa == va to avoid infinite recursion.
*/
if (vm->Sysmap == 0) {
*pa = va;
return (NBPG - offset);
}
if (va < KERNBASE ||
va >= VM_MIN_KERNEL_ADDRESS + vm->Sysmapsize * NBPG)
goto invalid;
if (va < VM_MIN_KERNEL_ADDRESS) {
*pa = MACH_CACHED_TO_PHYS(va);
return (NBPG - offset);
}
addr = (u_long)(vm->Sysmap + ((va - VM_MIN_KERNEL_ADDRESS) >> PGSHIFT));
/*
* Can't use KREAD to read kernel segment table entries.
* Fortunately it is 1-to-1 mapped so we don't have to.
*/
if (lseek(kd->pmfd, (off_t)addr, 0) < 0 ||
read(kd->pmfd, (char *)&pte, sizeof(pte)) < 0)
goto invalid;
if (!(pte & PG_V))
goto invalid;
*pa = (pte & PG_FRAME) | offset;
return (NBPG - offset);
invalid:
_kvm_err(kd, 0, "invalid address (%x)", va);
return (0);
}
/*
* Translate a user virtual address to a physical address.
*/
int
_kvm_uvatop(kd, p, va, pa)
kvm_t *kd;
const struct proc *p;
u_long va;
u_long *pa;
{
register struct vmspace *vms = p->p_vmspace;
u_long kva, offset;
if (va >= KERNBASE)
goto invalid;
/* read the address of the first level table */
kva = (u_long)&vms->vm_pmap.pm_segtab;
if (kvm_read(kd, kva, (char *)&kva, sizeof(kva)) != sizeof(kva))
goto invalid;
if (kva == 0)
goto invalid;
/* read the address of the second level table */
kva += (va >> SEGSHIFT) * sizeof(caddr_t);
if (kvm_read(kd, kva, (char *)&kva, sizeof(kva)) != sizeof(kva))
goto invalid;
if (kva == 0)
goto invalid;
/* read the pte from the second level table */
kva += (va >> PGSHIFT) & (NPTEPG - 1);
if (kvm_read(kd, kva, (char *)&kva, sizeof(kva)) != sizeof(kva))
goto invalid;
if (!(kva & PG_V))
goto invalid;
offset = va & PGOFSET;
*pa = (kva & PG_FRAME) | offset;
return (NBPG - offset);
invalid:
_kvm_err(kd, 0, "invalid address (%x)", va);
return (0);
}
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