1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (C) 2010 Nathan Whitehorn
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD$");
30
31#include <sys/param.h>
32#include <sys/kernel.h>
33#include <sys/ktr.h>
34#include <sys/lock.h>
35#include <sys/msgbuf.h>
36#include <sys/mutex.h>
37#include <sys/proc.h>
38#include <sys/sysctl.h>
39#include <sys/systm.h>
40#include <sys/vmmeter.h>
41
42#include <vm/vm.h>
43#include <vm/vm_param.h>
44#include <vm/vm_kern.h>
45#include <vm/vm_page.h>
46#include <vm/vm_map.h>
47#include <vm/vm_object.h>
48#include <vm/vm_extern.h>
49#include <vm/vm_pageout.h>
50#include <vm/uma.h>
51
52#include <powerpc/aim/mmu_oea64.h>
53
54#include "ps3-hvcall.h"
55
56#define VSID_HASH_MASK		0x0000007fffffffffUL
57#define PTESYNC()		__asm __volatile("ptesync")
58
59extern int ps3fb_remap(void);
60
61static uint64_t mps3_vas_id;
62
63/*
64 * Kernel MMU interface
65 */
66
67static void	mps3_install(void);
68static void	mps3_bootstrap(vm_offset_t kernelstart,
69		    vm_offset_t kernelend);
70static void	mps3_cpu_bootstrap(int ap);
71static int64_t	mps3_pte_synch(struct pvo_entry *);
72static int64_t	mps3_pte_clear(struct pvo_entry *, uint64_t ptebit);
73static int64_t	mps3_pte_unset(struct pvo_entry *);
74static int64_t	mps3_pte_insert(struct pvo_entry *);
75
76static struct pmap_funcs mps3_methods = {
77	.install = mps3_install,
78        .bootstrap = mps3_bootstrap,
79        .cpu_bootstrap = mps3_cpu_bootstrap,
80};
81
82static struct moea64_funcs mps3_funcs = {
83	.pte_synch = mps3_pte_synch,
84	.pte_clear = mps3_pte_clear,
85	.pte_unset = mps3_pte_unset,
86	.pte_insert = mps3_pte_insert,
87};
88
89MMU_DEF_INHERIT(ps3_mmu, "mmu_ps3", mps3_methods, oea64_mmu);
90
91static struct mtx mps3_table_lock;
92
93static void
94mps3_install()
95{
96	moea64_ops = &mps3_funcs;
97}
98
99static void
100mps3_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
101{
102	uint64_t final_pteg_count;
103
104	mtx_init(&mps3_table_lock, "page table", NULL, MTX_DEF);
105
106	moea64_early_bootstrap(kernelstart, kernelend);
107
108	/* In case we had a page table already */
109	lv1_destruct_virtual_address_space(0);
110
111	/* Allocate new hardware page table */
112	lv1_construct_virtual_address_space(
113	    20 /* log_2(moea64_pteg_count) */, 2 /* n page sizes */,
114	    (24UL << 56) | (16UL << 48) /* page sizes 16 MB + 64 KB */,
115	    &mps3_vas_id, &final_pteg_count
116	);
117
118	lv1_select_virtual_address_space(mps3_vas_id);
119
120	moea64_pteg_count = final_pteg_count / sizeof(struct lpteg);
121
122	moea64_mid_bootstrap(kernelstart, kernelend);
123	moea64_late_bootstrap(kernelstart, kernelend);
124}
125
126static void
127mps3_cpu_bootstrap(int ap)
128{
129	struct slb *slb = PCPU_GET(aim.slb);
130	register_t seg0;
131	int i;
132
133	mtmsr(mfmsr() & ~PSL_DR & ~PSL_IR);
134
135	/*
136	 * Select the page table we configured above and set up the FB mapping
137	 * so we can have a console.
138	 */
139	lv1_select_virtual_address_space(mps3_vas_id);
140
141	if (!ap)
142		ps3fb_remap();
143
144	/*
145	 * Install kernel SLB entries
146	 */
147
148        __asm __volatile ("slbia");
149        __asm __volatile ("slbmfee %0,%1; slbie %0;" : "=r"(seg0) : "r"(0));
150	for (i = 0; i < 64; i++) {
151		if (!(slb[i].slbe & SLBE_VALID))
152			continue;
153
154		__asm __volatile ("slbmte %0, %1" ::
155		    "r"(slb[i].slbv), "r"(slb[i].slbe));
156	}
157}
158
159static int64_t
160mps3_pte_synch_locked(struct pvo_entry *pvo)
161{
162	uint64_t halfbucket[4], rcbits;
163
164	PTESYNC();
165	lv1_read_htab_entries(mps3_vas_id, pvo->pvo_pte.slot & ~0x3UL,
166	    &halfbucket[0], &halfbucket[1], &halfbucket[2], &halfbucket[3],
167	    &rcbits);
168
169	/* Check if present in page table */
170	if ((halfbucket[pvo->pvo_pte.slot & 0x3] & LPTE_AVPN_MASK) !=
171	    ((pvo->pvo_vpn >> (ADDR_API_SHFT64 - ADDR_PIDX_SHFT)) &
172	    LPTE_AVPN_MASK))
173		return (-1);
174	if (!(halfbucket[pvo->pvo_pte.slot & 0x3] & LPTE_VALID))
175		return (-1);
176
177	/*
178	 * rcbits contains the low 12 bits of each PTE's 2nd part,
179	 * spaced at 16-bit intervals
180	 */
181
182	return ((rcbits >> ((3 - (pvo->pvo_pte.slot & 0x3))*16)) &
183	    (LPTE_CHG | LPTE_REF));
184}
185
186static int64_t
187mps3_pte_synch(struct pvo_entry *pvo)
188{
189	int64_t retval;
190
191	mtx_lock(&mps3_table_lock);
192	retval = mps3_pte_synch_locked(pvo);
193	mtx_unlock(&mps3_table_lock);
194
195	return (retval);
196}
197
198static int64_t
199mps3_pte_clear(struct pvo_entry *pvo, uint64_t ptebit)
200{
201	int64_t refchg;
202	struct lpte pte;
203
204	mtx_lock(&mps3_table_lock);
205
206	refchg = mps3_pte_synch_locked(pvo);
207	if (refchg < 0) {
208		mtx_unlock(&mps3_table_lock);
209		return (refchg);
210	}
211
212	moea64_pte_from_pvo(pvo, &pte);
213
214	pte.pte_lo |= refchg;
215	pte.pte_lo &= ~ptebit;
216	/* XXX: race on RC bits between write and sync. Anything to do? */
217	lv1_write_htab_entry(mps3_vas_id, pvo->pvo_pte.slot, pte.pte_hi,
218	    pte.pte_lo);
219	mtx_unlock(&mps3_table_lock);
220
221	return (refchg);
222}
223
224static int64_t
225mps3_pte_unset(struct pvo_entry *pvo)
226{
227	int64_t refchg;
228
229	mtx_lock(&mps3_table_lock);
230	refchg = mps3_pte_synch_locked(pvo);
231	if (refchg < 0) {
232		STAT_MOEA64(moea64_pte_overflow--);
233		mtx_unlock(&mps3_table_lock);
234		return (-1);
235	}
236	/* XXX: race on RC bits between unset and sync. Anything to do? */
237	lv1_write_htab_entry(mps3_vas_id, pvo->pvo_pte.slot, 0, 0);
238	mtx_unlock(&mps3_table_lock);
239	STAT_MOEA64(moea64_pte_valid--);
240
241	return (refchg & (LPTE_REF | LPTE_CHG));
242}
243
244static int64_t
245mps3_pte_insert(struct pvo_entry *pvo)
246{
247	int result;
248	struct lpte pte, evicted;
249	uint64_t index;
250
251	if (pvo->pvo_vaddr & PVO_HID) {
252		/* Hypercall needs primary PTEG */
253		pvo->pvo_vaddr &= ~PVO_HID;
254		pvo->pvo_pte.slot ^= (moea64_pteg_mask << 3);
255	}
256
257	pvo->pvo_pte.slot &= ~7UL;
258	moea64_pte_from_pvo(pvo, &pte);
259	evicted.pte_hi = 0;
260	PTESYNC();
261	mtx_lock(&mps3_table_lock);
262	result = lv1_insert_htab_entry(mps3_vas_id, pvo->pvo_pte.slot,
263	    pte.pte_hi, pte.pte_lo, LPTE_LOCKED | LPTE_WIRED, 0,
264	    &index, &evicted.pte_hi, &evicted.pte_lo);
265	mtx_unlock(&mps3_table_lock);
266
267	if (result != 0) {
268		/* No freeable slots in either PTEG? We're hosed. */
269		panic("mps3_pte_insert: overflow (%d)", result);
270		return (-1);
271	}
272
273	/*
274	 * See where we ended up.
275	 */
276	if ((index & ~7UL) != pvo->pvo_pte.slot)
277		pvo->pvo_vaddr |= PVO_HID;
278	pvo->pvo_pte.slot = index;
279
280	STAT_MOEA64(moea64_pte_valid++);
281
282	if (evicted.pte_hi) {
283		KASSERT((evicted.pte_hi & (LPTE_WIRED | LPTE_LOCKED)) == 0,
284		    ("Evicted a wired PTE"));
285		STAT_MOEA64(moea64_pte_valid--);
286		STAT_MOEA64(moea64_pte_overflow++);
287	}
288
289	return (0);
290}
291