1/*	$NetBSD: kvm_sparc64.c,v 1.19 2023/08/23 14:00:11 rin Exp $	*/
2
3/*-
4 * Copyright (c) 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software developed by the Computer Systems
8 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
9 * BG 91-66 and contributed to Berkeley.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37#if defined(LIBC_SCCS) && !defined(lint)
38#if 0
39static char sccsid[] = "@(#)kvm_sparc.c	8.1 (Berkeley) 6/4/93";
40#else
41__RCSID("$NetBSD: kvm_sparc64.c,v 1.19 2023/08/23 14:00:11 rin Exp $");
42#endif
43#endif /* LIBC_SCCS and not lint */
44
45/*
46 * Sparc machine dependent routines for kvm.  Hopefully, the forthcoming
47 * vm code will one day obsolete this module.
48 */
49
50#include <sys/param.h>
51#include <sys/exec.h>
52#include <sys/proc.h>
53#include <sys/stat.h>
54#include <sys/core.h>
55#include <sys/kcore.h>
56#include <sys/types.h>
57
58#include <unistd.h>
59#include <nlist.h>
60#include <kvm.h>
61
62#include <uvm/uvm_extern.h>
63
64#include <machine/pmap.h>
65#include <machine/kcore.h>
66#include <machine/vmparam.h>
67#include <machine/param.h>
68
69#include <limits.h>
70#include <db.h>
71
72#include "kvm_private.h"
73
74void
75_kvm_freevtop(kvm_t *kd)
76{
77	if (kd->vmst != 0) {
78		_kvm_err(kd, kd->program, "_kvm_freevtop: internal error");
79		kd->vmst = 0;
80	}
81}
82
83/*
84 * Prepare for translation of kernel virtual addresses into offsets
85 * into crash dump files. We use the MMU specific goop written at the
86 * front of the crash dump by pmap_dumpmmu().
87 *
88 * We should read in and cache the ksegs here to speed up operations...
89 */
90int
91_kvm_initvtop(kvm_t *kd)
92{
93	kd->nbpg = 0x2000;
94
95	return (0);
96}
97
98/*
99 * Translate a kernel virtual address to a physical address using the
100 * mapping information in kd->vm.  Returns the result in pa, and returns
101 * the number of bytes that are contiguously available from this
102 * physical address.  This routine is used only for crash dumps.
103 */
104int
105_kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa)
106{
107	cpu_kcore_hdr_t *cpup = kd->cpu_data;
108	u_long kernbase = cpup->kernbase;
109	uint64_t *pseg, *pdir, *ptbl;
110	struct cpu_kcore_4mbseg *ktlb;
111	int64_t data;
112	int i;
113
114	if (va < kernbase)
115		goto lose;
116
117	/* Handle the wired 4MB TTEs and per-CPU mappings */
118	if (cpup->memsegoffset > sizeof(cpu_kcore_hdr_t) &&
119	    cpup->newmagic == SPARC64_KCORE_NEWMAGIC) {
120		/*
121		 * new format: we have a list of 4 MB mappings
122		 */
123		ktlb = (struct cpu_kcore_4mbseg *)
124			((uintptr_t)kd->cpu_data + cpup->off4mbsegs);
125		for (i = 0; i < cpup->num4mbsegs; i++) {
126			uint64_t start = ktlb[i].va;
127			if (va < start || va >= start+PAGE_SIZE_4M)
128				continue;
129			*pa = ktlb[i].pa + va - start;
130			return (int)(start+PAGE_SIZE_4M - va);
131		}
132
133		if (cpup->numcpuinfos > 0) {
134			/* we have per-CPU mapping info */
135			uint64_t start, base;
136
137			base = cpup->cpubase - 32*1024;
138			if (va >= base && va < (base + cpup->percpusz)) {
139				start = va - base;
140				*pa = cpup->cpusp
141				    + cpup->thiscpu*cpup->percpusz
142				    + start;
143				return cpup->percpusz - start;
144			}
145		}
146	} else {
147		/*
148		 * old format: just a textbase/size and database/size
149		 */
150		if (va > cpup->ktextbase && va <
151		    (cpup->ktextbase + cpup->ktextsz)) {
152			u_long vaddr;
153
154			vaddr = va - cpup->ktextbase;
155			*pa = cpup->ktextp + vaddr;
156			return (int)(cpup->ktextsz - vaddr);
157		}
158		if (va > cpup->kdatabase && va <
159		    (cpup->kdatabase + cpup->kdatasz)) {
160			u_long vaddr;
161
162			vaddr = va - cpup->kdatabase;
163			*pa = cpup->kdatap + vaddr;
164			return (int)(cpup->kdatasz - vaddr);
165		}
166	}
167
168	/*
169	 * Parse kernel page table.
170	 */
171	pseg = (uint64_t *)(u_long)cpup->segmapoffset;
172	if (_kvm_pread(kd, kd->pmfd, &pdir, sizeof(pdir),
173		_kvm_pa2off(kd, (paddr_t)&pseg[va_to_seg(va)]))
174		!= sizeof(pdir)) {
175		_kvm_syserr(kd, 0, "could not read L1 PTE");
176		goto lose;
177	}
178
179	if (!pdir) {
180		_kvm_err(kd, 0, "invalid L1 PTE");
181		goto lose;
182	}
183
184	if (_kvm_pread(kd, kd->pmfd, &ptbl, sizeof(ptbl),
185		_kvm_pa2off(kd, (paddr_t)&pdir[va_to_dir(va)]))
186		!= sizeof(ptbl)) {
187		_kvm_syserr(kd, 0, "could not read L2 PTE");
188		goto lose;
189	}
190
191	if (!ptbl) {
192		_kvm_err(kd, 0, "invalid L2 PTE");
193		goto lose;
194	}
195
196	if (_kvm_pread(kd, kd->pmfd, &data, sizeof(data),
197		_kvm_pa2off(kd, (paddr_t)&ptbl[va_to_pte(va)]))
198		!= sizeof(data)) {
199		_kvm_syserr(kd, 0, "could not read TTE");
200		goto lose;
201	}
202
203	if (data >= 0) {
204		_kvm_err(kd, 0, "invalid L2 TTE");
205		goto lose;
206	}
207
208	/*
209	 * Calculate page offsets and things.
210	 *
211	 * XXXX -- We could support multiple page sizes.
212	 */
213	va = va & (kd->nbpg - 1);
214	data &= SUN4U_TLB_PA_MASK; /* XXX handle sun4u/sun4v */
215	*pa = data + va;
216
217	/*
218	 * Parse and trnslate our TTE.
219	 */
220
221	return (int)(kd->nbpg - va);
222
223lose:
224	*pa = (u_long)-1;
225	_kvm_err(kd, 0, "invalid address (%#"PRIxVADDR")", va);
226	return (0);
227}
228
229
230/*
231 * Translate a physical address to a file-offset in the crash dump.
232 */
233off_t
234_kvm_pa2off(kvm_t *kd, paddr_t pa)
235{
236	cpu_kcore_hdr_t *cpup = kd->cpu_data;
237	phys_ram_seg_t *mp;
238	off_t off;
239	int nmem;
240
241	/*
242	 * Layout of CPU segment:
243	 *	cpu_kcore_hdr_t;
244	 *	[alignment]
245	 *	phys_ram_seg_t[cpup->nmemseg];
246	 */
247	mp = (phys_ram_seg_t *)((long)kd->cpu_data + cpup->memsegoffset);
248	off = 0;
249
250	/* Translate (sparse) pfnum to (packed) dump offset */
251	for (nmem = cpup->nmemseg; --nmem >= 0; mp++) {
252		if (mp->start <= pa && pa < mp->start + mp->size)
253			break;
254		off += mp->size;
255	}
256	if (nmem < 0) {
257		_kvm_err(kd, 0, "invalid address (%#"PRIxPADDR")", pa);
258		return (-1);
259	}
260
261	return (kd->dump_off + off + pa - mp->start);
262}
263
264/*
265 * Machine-dependent initialization for ALL open kvm descriptors,
266 * not just those for a kernel crash dump.  Some architectures
267 * have to deal with these NOT being constants!  (i.e. m68k)
268 */
269int
270_kvm_mdopen(kvm_t *kd)
271{
272	u_long max_uva;
273	extern struct ps_strings *__ps_strings;
274
275	max_uva = (u_long) (__ps_strings + 1);
276	kd->max_uva  = max_uva;
277	kd->min_uva  = 0;
278
279	return (0);
280}
281