1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/param.h>
29 #include <sys/kernel.h>
30 #include <sys/ktr.h>
31 #include <sys/lock.h>
32 #include <sys/msgbuf.h>
33 #include <sys/mutex.h>
34 #include <sys/proc.h>
35 #include <sys/sysctl.h>
36 #include <sys/systm.h>
37 #include <sys/vmmeter.h>
38
39 #include <vm/vm.h>
40 #include <vm/vm_param.h>
41 #include <vm/vm_kern.h>
42 #include <vm/vm_page.h>
43 #include <vm/vm_map.h>
44 #include <vm/vm_object.h>
45 #include <vm/vm_extern.h>
46 #include <vm/vm_pageout.h>
47 #include <vm/uma.h>
48
49 #include <powerpc/aim/mmu_oea64.h>
50
51 #include "ps3-hvcall.h"
52
53 #define VSID_HASH_MASK 0x0000007fffffffffUL
54 #define PTESYNC() __asm __volatile("ptesync")
55
56 extern int ps3fb_remap(void);
57
58 static uint64_t mps3_vas_id;
59
60 /*
61 * Kernel MMU interface
62 */
63
64 static void mps3_install(void);
65 static void mps3_bootstrap(vm_offset_t kernelstart,
66 vm_offset_t kernelend);
67 static void mps3_cpu_bootstrap(int ap);
68 static int64_t mps3_pte_synch(struct pvo_entry *);
69 static int64_t mps3_pte_clear(struct pvo_entry *, uint64_t ptebit);
70 static int64_t mps3_pte_unset(struct pvo_entry *);
71 static int64_t mps3_pte_insert(struct pvo_entry *);
72
73 static struct pmap_funcs mps3_methods = {
74 .install = mps3_install,
75 .bootstrap = mps3_bootstrap,
76 .cpu_bootstrap = mps3_cpu_bootstrap,
77 };
78
79 static struct moea64_funcs mps3_funcs = {
80 .pte_synch = mps3_pte_synch,
81 .pte_clear = mps3_pte_clear,
82 .pte_unset = mps3_pte_unset,
83 .pte_insert = mps3_pte_insert,
84 };
85
86 MMU_DEF_INHERIT(ps3_mmu, "mmu_ps3", mps3_methods, oea64_mmu);
87
88 static struct mtx mps3_table_lock;
89
90 static void
mps3_install(void)91 mps3_install(void)
92 {
93 moea64_ops = &mps3_funcs;
94 moea64_install();
95 }
96
97 static void
mps3_bootstrap(vm_offset_t kernelstart,vm_offset_t kernelend)98 mps3_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
99 {
100 uint64_t final_pteg_count;
101
102 mtx_init(&mps3_table_lock, "page table", NULL, MTX_DEF);
103
104 moea64_early_bootstrap(kernelstart, kernelend);
105
106 /* In case we had a page table already */
107 lv1_destruct_virtual_address_space(0);
108
109 /* Allocate new hardware page table */
110 lv1_construct_virtual_address_space(
111 20 /* log_2(moea64_pteg_count) */, 2 /* n page sizes */,
112 (24UL << 56) | (16UL << 48) /* page sizes 16 MB + 64 KB */,
113 &mps3_vas_id, &final_pteg_count
114 );
115
116 lv1_select_virtual_address_space(mps3_vas_id);
117
118 moea64_pteg_count = final_pteg_count / sizeof(struct lpteg);
119
120 moea64_mid_bootstrap(kernelstart, kernelend);
121 moea64_late_bootstrap(kernelstart, kernelend);
122 }
123
124 static void
mps3_cpu_bootstrap(int ap)125 mps3_cpu_bootstrap(int ap)
126 {
127 struct slb *slb = PCPU_GET(aim.slb);
128 register_t seg0;
129 int i;
130
131 mtmsr(mfmsr() & ~PSL_DR & ~PSL_IR);
132
133 /*
134 * Select the page table we configured above and set up the FB mapping
135 * so we can have a console.
136 */
137 lv1_select_virtual_address_space(mps3_vas_id);
138
139 if (!ap)
140 ps3fb_remap();
141
142 /*
143 * Install kernel SLB entries
144 */
145
146 __asm __volatile ("slbia");
147 __asm __volatile ("slbmfee %0,%1; slbie %0;" : "=r"(seg0) : "r"(0));
148 for (i = 0; i < 64; i++) {
149 if (!(slb[i].slbe & SLBE_VALID))
150 continue;
151
152 __asm __volatile ("slbmte %0, %1" ::
153 "r"(slb[i].slbv), "r"(slb[i].slbe));
154 }
155 }
156
157 static int64_t
mps3_pte_synch_locked(struct pvo_entry * pvo)158 mps3_pte_synch_locked(struct pvo_entry *pvo)
159 {
160 uint64_t halfbucket[4], rcbits;
161
162 PTESYNC();
163 lv1_read_htab_entries(mps3_vas_id, pvo->pvo_pte.slot & ~0x3UL,
164 &halfbucket[0], &halfbucket[1], &halfbucket[2], &halfbucket[3],
165 &rcbits);
166
167 /* Check if present in page table */
168 if ((halfbucket[pvo->pvo_pte.slot & 0x3] & LPTE_AVPN_MASK) !=
169 ((pvo->pvo_vpn >> (ADDR_API_SHFT64 - ADDR_PIDX_SHFT)) &
170 LPTE_AVPN_MASK))
171 return (-1);
172 if (!(halfbucket[pvo->pvo_pte.slot & 0x3] & LPTE_VALID))
173 return (-1);
174
175 /*
176 * rcbits contains the low 12 bits of each PTE's 2nd part,
177 * spaced at 16-bit intervals
178 */
179
180 return ((rcbits >> ((3 - (pvo->pvo_pte.slot & 0x3))*16)) &
181 (LPTE_CHG | LPTE_REF));
182 }
183
184 static int64_t
mps3_pte_synch(struct pvo_entry * pvo)185 mps3_pte_synch(struct pvo_entry *pvo)
186 {
187 int64_t retval;
188
189 mtx_lock(&mps3_table_lock);
190 retval = mps3_pte_synch_locked(pvo);
191 mtx_unlock(&mps3_table_lock);
192
193 return (retval);
194 }
195
196 static int64_t
mps3_pte_clear(struct pvo_entry * pvo,uint64_t ptebit)197 mps3_pte_clear(struct pvo_entry *pvo, uint64_t ptebit)
198 {
199 int64_t refchg;
200 struct lpte pte;
201
202 mtx_lock(&mps3_table_lock);
203
204 refchg = mps3_pte_synch_locked(pvo);
205 if (refchg < 0) {
206 mtx_unlock(&mps3_table_lock);
207 return (refchg);
208 }
209
210 moea64_pte_from_pvo(pvo, &pte);
211
212 pte.pte_lo |= refchg;
213 pte.pte_lo &= ~ptebit;
214 /* XXX: race on RC bits between write and sync. Anything to do? */
215 lv1_write_htab_entry(mps3_vas_id, pvo->pvo_pte.slot, pte.pte_hi,
216 pte.pte_lo);
217 mtx_unlock(&mps3_table_lock);
218
219 return (refchg);
220 }
221
222 static int64_t
mps3_pte_unset(struct pvo_entry * pvo)223 mps3_pte_unset(struct pvo_entry *pvo)
224 {
225 int64_t refchg;
226
227 mtx_lock(&mps3_table_lock);
228 refchg = mps3_pte_synch_locked(pvo);
229 if (refchg < 0) {
230 STAT_MOEA64(moea64_pte_overflow--);
231 mtx_unlock(&mps3_table_lock);
232 return (-1);
233 }
234 /* XXX: race on RC bits between unset and sync. Anything to do? */
235 lv1_write_htab_entry(mps3_vas_id, pvo->pvo_pte.slot, 0, 0);
236 mtx_unlock(&mps3_table_lock);
237 STAT_MOEA64(moea64_pte_valid--);
238
239 return (refchg & (LPTE_REF | LPTE_CHG));
240 }
241
242 static int64_t
mps3_pte_insert(struct pvo_entry * pvo)243 mps3_pte_insert(struct pvo_entry *pvo)
244 {
245 int result;
246 struct lpte pte, evicted;
247 uint64_t index;
248
249 if (pvo->pvo_vaddr & PVO_HID) {
250 /* Hypercall needs primary PTEG */
251 pvo->pvo_vaddr &= ~PVO_HID;
252 pvo->pvo_pte.slot ^= (moea64_pteg_mask << 3);
253 }
254
255 pvo->pvo_pte.slot &= ~7UL;
256 moea64_pte_from_pvo(pvo, &pte);
257 evicted.pte_hi = 0;
258 PTESYNC();
259 mtx_lock(&mps3_table_lock);
260 result = lv1_insert_htab_entry(mps3_vas_id, pvo->pvo_pte.slot,
261 pte.pte_hi, pte.pte_lo, LPTE_LOCKED | LPTE_WIRED, 0,
262 &index, &evicted.pte_hi, &evicted.pte_lo);
263 mtx_unlock(&mps3_table_lock);
264
265 if (result != 0) {
266 /* No freeable slots in either PTEG? We're hosed. */
267 panic("mps3_pte_insert: overflow (%d)", result);
268 return (-1);
269 }
270
271 /*
272 * See where we ended up.
273 */
274 if ((index & ~7UL) != pvo->pvo_pte.slot)
275 pvo->pvo_vaddr |= PVO_HID;
276 pvo->pvo_pte.slot = index;
277
278 STAT_MOEA64(moea64_pte_valid++);
279
280 if (evicted.pte_hi) {
281 KASSERT((evicted.pte_hi & (LPTE_WIRED | LPTE_LOCKED)) == 0,
282 ("Evicted a wired PTE"));
283 STAT_MOEA64(moea64_pte_valid--);
284 STAT_MOEA64(moea64_pte_overflow++);
285 }
286
287 return (0);
288 }
289