Annotation of src/lib/libkvm/kvm_aarch64.c, Revision 1.1
1.1 ! matt 1: /* $NetBSD$ */
! 2:
! 3: /*-
! 4: * Copyright (c) 2014 The NetBSD Foundation, Inc.
! 5: * All rights reserved.
! 6: *
! 7: * This code is derived from software contributed to The NetBSD Foundation
! 8: * by Matt Thomas of 3am Software Foundry.
! 9: *
! 10: * Redistribution and use in source and binary forms, with or without
! 11: * modification, are permitted provided that the following conditions
! 12: * are met:
! 13: * 1. Redistributions of source code must retain the above copyright
! 14: * notice, this list of conditions and the following disclaimer.
! 15: * 2. Redistributions in binary form must reproduce the above copyright
! 16: * notice, this list of conditions and the following disclaimer in the
! 17: * documentation and/or other materials provided with the distribution.
! 18: *
! 19: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
! 20: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 21: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 22: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
! 23: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 24: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 25: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 26: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 27: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 28: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 29: * POSSIBILITY OF SUCH DAMAGE.
! 30: */
! 31:
! 32: #include <sys/param.h>
! 33: #include <sys/user.h>
! 34: #include <sys/proc.h>
! 35: #include <sys/stat.h>
! 36: #include <sys/kcore.h>
! 37: #include <sys/types.h>
! 38: #include <unistd.h>
! 39: #include <nlist.h>
! 40: #include <kvm.h>
! 41:
! 42: #include <machine/kcore.h>
! 43: #include <machine/pte.h>
! 44: #include <machine/vmparam.h>
! 45:
! 46: #include <limits.h>
! 47: #include <db.h>
! 48: #include <stdlib.h>
! 49:
! 50: #include "kvm_private.h"
! 51:
! 52: __RCSID("$NetBSD$");
! 53:
! 54: /*ARGSUSED*/
! 55: void
! 56: _kvm_freevtop(kvm_t *kd)
! 57: {
! 58: return;
! 59: }
! 60:
! 61: /*ARGSUSED*/
! 62: int
! 63: _kvm_initvtop(kvm_t *kd)
! 64: {
! 65: return (0);
! 66: }
! 67:
! 68: int
! 69: _kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa)
! 70: {
! 71: if (ISALIVE(kd)) {
! 72: _kvm_err(kd, 0, "vatop called in live kernel!");
! 73: return(0);
! 74: }
! 75:
! 76: if ((va & AARCH64_KSEG_MASK) != AARCH64_KSEG_START) {
! 77: /*
! 78: * Bogus address (not in KV space): punt.
! 79: */
! 80: _kvm_err(kd, 0, "invalid kernel virtual address");
! 81: lose:
! 82: *pa = -1;
! 83: return 0;
! 84: }
! 85:
! 86: const cpu_kcore_hdr_t * const cpu_kh = kd->cpu_data;
! 87: const u_int tg1 =__SHIFTOUT(cpu_kh->kh_tcr1, TCR_TG1);
! 88: const u_int t1siz = __SHIFTOUT(cpu_kh->kh_tcr1, TCR_T1SZ);
! 89:
! 90: /*
! 91: * Real kernel virtual address: do the translation.
! 92: */
! 93:
! 94: u_int va_bits;
! 95: u_int page_shift;
! 96:
! 97: switch (tg1) {
! 98: case TCR_TG_4KB:
! 99: va_bits = t1siz + 36;
! 100: page_shift = 12;
! 101: break;
! 102: case TCR_TG_16KB:
! 103: va_bits = 48;
! 104: page_shift = 14;
! 105: break;
! 106: case TCR_TG_64KB:
! 107: va_bits = t1siz + 38;
! 108: page_shift = 16;
! 109: break;
! 110: default:
! 111: goto lose;
! 112: }
! 113:
! 114: const size_t page_size = 1 << page_shift;
! 115: const uint64_t page_mask = (page_size - 1);
! 116: const uint64_t page_addr = __BITS(47, 0) & ~page_mask;
! 117: const uint64_t pte_mask = page_mask >> 3;
! 118: const u_int pte_shift = page_shift - 3;
! 119:
! 120: /* how many level of page tables do we have? */
! 121: u_int level = (48 + page_shift - 1) / page_shift;
! 122:
! 123: /* restrict va to the valid VA bits */
! 124: va &= (1LL << va_bits) - 1;
! 125:
! 126: u_int addr_shift = page_shift + (level - 1) * pte_shift;
! 127:
! 128: /* clear out the unused low bits of the table address */
! 129: paddr_t pte_addr = (cpu_kh->kh_ttbr1 & TTBR_BADDR);
! 130: pte_addr &= ~((8L << (va_bits - addr_shift)) - 1);
! 131:
! 132: for (;;) {
! 133: pt_entry_t pte;
! 134:
! 135: /* now index into the pte table */
! 136: pte_addr += 8 * ((va >> addr_shift) & pte_mask);
! 137:
! 138: /* Find and read the PTE. */
! 139: if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte),
! 140: _kvm_pa2off(kd, pte_addr)) != sizeof(pte)) {
! 141: _kvm_syserr(kd, 0, "could not read pte");
! 142: goto lose;
! 143: }
! 144:
! 145: /* Find and read the L2 PTE. */
! 146: if ((pte & LX_VALID) == 0) {
! 147: _kvm_err(kd, 0, "invalid translation (invalid pte)");
! 148: goto lose;
! 149: }
! 150:
! 151: if ((pte & LX_TYPE) == LX_TYPE_BLK) {
! 152: const paddr_t blk_mask = ((1L << addr_shift) - 1);
! 153:
! 154: *pa = (pte & page_addr & ~blk_mask) | (va & blk_mask);
! 155: return 0;
! 156: }
! 157:
! 158: if (level == page_shift) {
! 159: *pa = (pte & page_addr) | (va & page_mask);
! 160: return 0;
! 161: }
! 162:
! 163: /*
! 164: * Read next level of page table
! 165: */
! 166:
! 167: pte_addr = pte & page_addr;
! 168: addr_shift -= pte_shift;
! 169: }
! 170: }
! 171:
! 172: /*
! 173: * Translate a physical address to a file-offset in the crash dump.
! 174: */
! 175: off_t
! 176: _kvm_pa2off(kvm_t *kd, paddr_t pa)
! 177: {
! 178: const cpu_kcore_hdr_t * const cpu_kh = kd->cpu_data;
! 179: off_t off = 0;
! 180:
! 181: for (const phys_ram_seg_t *ramsegs = cpu_kh->kh_ramsegs;
! 182: ramsegs->size != 0; ramsegs++) {
! 183: if (pa >= ramsegs->start
! 184: && pa < ramsegs->start + ramsegs->size) {
! 185: off += pa - ramsegs->start;
! 186: break;
! 187: }
! 188: off += ramsegs->size;
! 189: }
! 190:
! 191: return kd->dump_off + off;
! 192: }
! 193:
! 194: /*
! 195: * Machine-dependent initialization for ALL open kvm descriptors,
! 196: * not just those for a kernel crash dump. Some architectures
! 197: * have to deal with these NOT being constants! (i.e. m68k)
! 198: */
! 199: int
! 200: _kvm_mdopen(kvm_t *kd)
! 201: {
! 202:
! 203: kd->usrstack = USRSTACK;
! 204: kd->min_uva = VM_MIN_ADDRESS;
! 205: kd->max_uva = VM_MAXUSER_ADDRESS;
! 206:
! 207: return (0);
! 208: }
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