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/* $NetBSD: kvm_aarch64.c,v 1.1 2014/08/10 05:47:37 matt Exp $ */
/*-
* Copyright (c) 2014 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas of 3am Software Foundry.
*
* 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/param.h>
#include <sys/user.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/kcore.h>
#include <sys/types.h>
#include <unistd.h>
#include <nlist.h>
#include <kvm.h>
#include <machine/kcore.h>
#include <machine/pte.h>
#include <machine/vmparam.h>
#include <limits.h>
#include <db.h>
#include <stdlib.h>
#include "kvm_private.h"
__RCSID("$NetBSD: kvm_aarch64.c,v 1.1 2014/08/10 05:47:37 matt Exp $");
/*ARGSUSED*/
void
_kvm_freevtop(kvm_t *kd)
{
return;
}
/*ARGSUSED*/
int
_kvm_initvtop(kvm_t *kd)
{
return (0);
}
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);
}
if ((va & AARCH64_KSEG_MASK) != AARCH64_KSEG_START) {
/*
* Bogus address (not in KV space): punt.
*/
_kvm_err(kd, 0, "invalid kernel virtual address");
lose:
*pa = -1;
return 0;
}
const cpu_kcore_hdr_t * const cpu_kh = kd->cpu_data;
const u_int tg1 =__SHIFTOUT(cpu_kh->kh_tcr1, TCR_TG1);
const u_int t1siz = __SHIFTOUT(cpu_kh->kh_tcr1, TCR_T1SZ);
/*
* Real kernel virtual address: do the translation.
*/
u_int va_bits;
u_int page_shift;
switch (tg1) {
case TCR_TG_4KB:
va_bits = t1siz + 36;
page_shift = 12;
break;
case TCR_TG_16KB:
va_bits = 48;
page_shift = 14;
break;
case TCR_TG_64KB:
va_bits = t1siz + 38;
page_shift = 16;
break;
default:
goto lose;
}
const size_t page_size = 1 << page_shift;
const uint64_t page_mask = (page_size - 1);
const uint64_t page_addr = __BITS(47, 0) & ~page_mask;
const uint64_t pte_mask = page_mask >> 3;
const u_int pte_shift = page_shift - 3;
/* how many level of page tables do we have? */
u_int level = (48 + page_shift - 1) / page_shift;
/* restrict va to the valid VA bits */
va &= (1LL << va_bits) - 1;
u_int addr_shift = page_shift + (level - 1) * pte_shift;
/* clear out the unused low bits of the table address */
paddr_t pte_addr = (cpu_kh->kh_ttbr1 & TTBR_BADDR);
pte_addr &= ~((8L << (va_bits - addr_shift)) - 1);
for (;;) {
pt_entry_t pte;
/* now index into the pte table */
pte_addr += 8 * ((va >> addr_shift) & pte_mask);
/* Find and read the PTE. */
if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte),
_kvm_pa2off(kd, pte_addr)) != sizeof(pte)) {
_kvm_syserr(kd, 0, "could not read pte");
goto lose;
}
/* Find and read the L2 PTE. */
if ((pte & LX_VALID) == 0) {
_kvm_err(kd, 0, "invalid translation (invalid pte)");
goto lose;
}
if ((pte & LX_TYPE) == LX_TYPE_BLK) {
const paddr_t blk_mask = ((1L << addr_shift) - 1);
*pa = (pte & page_addr & ~blk_mask) | (va & blk_mask);
return 0;
}
if (level == page_shift) {
*pa = (pte & page_addr) | (va & page_mask);
return 0;
}
/*
* Read next level of page table
*/
pte_addr = pte & page_addr;
addr_shift -= pte_shift;
}
}
/*
* Translate a physical address to a file-offset in the crash dump.
*/
off_t
_kvm_pa2off(kvm_t *kd, paddr_t pa)
{
const cpu_kcore_hdr_t * const cpu_kh = kd->cpu_data;
off_t off = 0;
for (const phys_ram_seg_t *ramsegs = cpu_kh->kh_ramsegs;
ramsegs->size != 0; ramsegs++) {
if (pa >= ramsegs->start
&& pa < ramsegs->start + ramsegs->size) {
off += pa - ramsegs->start;
break;
}
off += ramsegs->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)
{
kd->usrstack = USRSTACK;
kd->min_uva = VM_MIN_ADDRESS;
kd->max_uva = VM_MAXUSER_ADDRESS;
return (0);
}
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