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/cdefs.h>
29 #include <sys/param.h>
30 #include <sys/kernel.h>
31 #include <sys/ktr.h>
32 #include <sys/lock.h>
33 #include <sys/msgbuf.h>
34 #include <sys/mutex.h>
35 #include <sys/proc.h>
36 #include <sys/sysctl.h>
37 #include <sys/systm.h>
38 #include <sys/vmmeter.h>
39
40 #include <vm/vm.h>
41 #include <vm/vm_param.h>
42 #include <vm/vm_kern.h>
43 #include <vm/vm_page.h>
44 #include <vm/vm_map.h>
45 #include <vm/vm_object.h>
46 #include <vm/vm_extern.h>
47 #include <vm/vm_pageout.h>
48 #include <vm/uma.h>
49
50 #include <powerpc/aim/mmu_oea64.h>
51
52 #include "ps3-hvcall.h"
53
54 #define VSID_HASH_MASK 0x0000007fffffffffUL
55 #define PTESYNC() __asm __volatile("ptesync")
56
57 extern int ps3fb_remap(void);
58
59 static uint64_t mps3_vas_id;
60
61 /*
62 * Kernel MMU interface
63 */
64
65 static void mps3_install(void);
66 static void mps3_bootstrap(vm_offset_t kernelstart,
67 vm_offset_t kernelend);
68 static void mps3_cpu_bootstrap(int ap);
69 static int64_t mps3_pte_synch(struct pvo_entry *);
70 static int64_t mps3_pte_clear(struct pvo_entry *, uint64_t ptebit);
71 static int64_t mps3_pte_unset(struct pvo_entry *);
72 static int64_t mps3_pte_insert(struct pvo_entry *);
73
74 static struct pmap_funcs mps3_methods = {
75 .install = mps3_install,
76 .bootstrap = mps3_bootstrap,
77 .cpu_bootstrap = mps3_cpu_bootstrap,
78 };
79
80 static struct moea64_funcs mps3_funcs = {
81 .pte_synch = mps3_pte_synch,
82 .pte_clear = mps3_pte_clear,
83 .pte_unset = mps3_pte_unset,
84 .pte_insert = mps3_pte_insert,
85 };
86
87 MMU_DEF_INHERIT(ps3_mmu, "mmu_ps3", mps3_methods, oea64_mmu);
88
89 static struct mtx mps3_table_lock;
90
91 static void
mps3_install(void)92 mps3_install(void)
93 {
94 moea64_ops = &mps3_funcs;
95 moea64_install();
96 }
97
98 static void
mps3_bootstrap(vm_offset_t kernelstart,vm_offset_t kernelend)99 mps3_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
100 {
101 uint64_t final_pteg_count;
102
103 mtx_init(&mps3_table_lock, "page table", NULL, MTX_DEF);
104
105 moea64_early_bootstrap(kernelstart, kernelend);
106
107 /* In case we had a page table already */
108 lv1_destruct_virtual_address_space(0);
109
110 /* Allocate new hardware page table */
111 lv1_construct_virtual_address_space(
112 20 /* log_2(moea64_pteg_count) */, 2 /* n page sizes */,
113 (24UL << 56) | (16UL << 48) /* page sizes 16 MB + 64 KB */,
114 &mps3_vas_id, &final_pteg_count
115 );
116
117 lv1_select_virtual_address_space(mps3_vas_id);
118
119 moea64_pteg_count = final_pteg_count / sizeof(struct lpteg);
120
121 moea64_mid_bootstrap(kernelstart, kernelend);
122 moea64_late_bootstrap(kernelstart, kernelend);
123 }
124
125 static void
mps3_cpu_bootstrap(int ap)126 mps3_cpu_bootstrap(int ap)
127 {
128 struct slb *slb = PCPU_GET(aim.slb);
129 register_t seg0;
130 int i;
131
132 mtmsr(mfmsr() & ~PSL_DR & ~PSL_IR);
133
134 /*
135 * Select the page table we configured above and set up the FB mapping
136 * so we can have a console.
137 */
138 lv1_select_virtual_address_space(mps3_vas_id);
139
140 if (!ap)
141 ps3fb_remap();
142
143 /*
144 * Install kernel SLB entries
145 */
146
147 __asm __volatile ("slbia");
148 __asm __volatile ("slbmfee %0,%1; slbie %0;" : "=r"(seg0) : "r"(0));
149 for (i = 0; i < 64; i++) {
150 if (!(slb[i].slbe & SLBE_VALID))
151 continue;
152
153 __asm __volatile ("slbmte %0, %1" ::
154 "r"(slb[i].slbv), "r"(slb[i].slbe));
155 }
156 }
157
158 static int64_t
mps3_pte_synch_locked(struct pvo_entry * pvo)159 mps3_pte_synch_locked(struct pvo_entry *pvo)
160 {
161 uint64_t halfbucket[4], rcbits;
162
163 PTESYNC();
164 lv1_read_htab_entries(mps3_vas_id, pvo->pvo_pte.slot & ~0x3UL,
165 &halfbucket[0], &halfbucket[1], &halfbucket[2], &halfbucket[3],
166 &rcbits);
167
168 /* Check if present in page table */
169 if ((halfbucket[pvo->pvo_pte.slot & 0x3] & LPTE_AVPN_MASK) !=
170 ((pvo->pvo_vpn >> (ADDR_API_SHFT64 - ADDR_PIDX_SHFT)) &
171 LPTE_AVPN_MASK))
172 return (-1);
173 if (!(halfbucket[pvo->pvo_pte.slot & 0x3] & LPTE_VALID))
174 return (-1);
175
176 /*
177 * rcbits contains the low 12 bits of each PTE's 2nd part,
178 * spaced at 16-bit intervals
179 */
180
181 return ((rcbits >> ((3 - (pvo->pvo_pte.slot & 0x3))*16)) &
182 (LPTE_CHG | LPTE_REF));
183 }
184
185 static int64_t
mps3_pte_synch(struct pvo_entry * pvo)186 mps3_pte_synch(struct pvo_entry *pvo)
187 {
188 int64_t retval;
189
190 mtx_lock(&mps3_table_lock);
191 retval = mps3_pte_synch_locked(pvo);
192 mtx_unlock(&mps3_table_lock);
193
194 return (retval);
195 }
196
197 static int64_t
mps3_pte_clear(struct pvo_entry * pvo,uint64_t ptebit)198 mps3_pte_clear(struct pvo_entry *pvo, uint64_t ptebit)
199 {
200 int64_t refchg;
201 struct lpte pte;
202
203 mtx_lock(&mps3_table_lock);
204
205 refchg = mps3_pte_synch_locked(pvo);
206 if (refchg < 0) {
207 mtx_unlock(&mps3_table_lock);
208 return (refchg);
209 }
210
211 moea64_pte_from_pvo(pvo, &pte);
212
213 pte.pte_lo |= refchg;
214 pte.pte_lo &= ~ptebit;
215 /* XXX: race on RC bits between write and sync. Anything to do? */
216 lv1_write_htab_entry(mps3_vas_id, pvo->pvo_pte.slot, pte.pte_hi,
217 pte.pte_lo);
218 mtx_unlock(&mps3_table_lock);
219
220 return (refchg);
221 }
222
223 static int64_t
mps3_pte_unset(struct pvo_entry * pvo)224 mps3_pte_unset(struct pvo_entry *pvo)
225 {
226 int64_t refchg;
227
228 mtx_lock(&mps3_table_lock);
229 refchg = mps3_pte_synch_locked(pvo);
230 if (refchg < 0) {
231 STAT_MOEA64(moea64_pte_overflow--);
232 mtx_unlock(&mps3_table_lock);
233 return (-1);
234 }
235 /* XXX: race on RC bits between unset and sync. Anything to do? */
236 lv1_write_htab_entry(mps3_vas_id, pvo->pvo_pte.slot, 0, 0);
237 mtx_unlock(&mps3_table_lock);
238 STAT_MOEA64(moea64_pte_valid--);
239
240 return (refchg & (LPTE_REF | LPTE_CHG));
241 }
242
243 static int64_t
mps3_pte_insert(struct pvo_entry * pvo)244 mps3_pte_insert(struct pvo_entry *pvo)
245 {
246 int result;
247 struct lpte pte, evicted;
248 uint64_t index;
249
250 if (pvo->pvo_vaddr & PVO_HID) {
251 /* Hypercall needs primary PTEG */
252 pvo->pvo_vaddr &= ~PVO_HID;
253 pvo->pvo_pte.slot ^= (moea64_pteg_mask << 3);
254 }
255
256 pvo->pvo_pte.slot &= ~7UL;
257 moea64_pte_from_pvo(pvo, &pte);
258 evicted.pte_hi = 0;
259 PTESYNC();
260 mtx_lock(&mps3_table_lock);
261 result = lv1_insert_htab_entry(mps3_vas_id, pvo->pvo_pte.slot,
262 pte.pte_hi, pte.pte_lo, LPTE_LOCKED | LPTE_WIRED, 0,
263 &index, &evicted.pte_hi, &evicted.pte_lo);
264 mtx_unlock(&mps3_table_lock);
265
266 if (result != 0) {
267 /* No freeable slots in either PTEG? We're hosed. */
268 panic("mps3_pte_insert: overflow (%d)", result);
269 return (-1);
270 }
271
272 /*
273 * See where we ended up.
274 */
275 if ((index & ~7UL) != pvo->pvo_pte.slot)
276 pvo->pvo_vaddr |= PVO_HID;
277 pvo->pvo_pte.slot = index;
278
279 STAT_MOEA64(moea64_pte_valid++);
280
281 if (evicted.pte_hi) {
282 KASSERT((evicted.pte_hi & (LPTE_WIRED | LPTE_LOCKED)) == 0,
283 ("Evicted a wired PTE"));
284 STAT_MOEA64(moea64_pte_valid--);
285 STAT_MOEA64(moea64_pte_overflow++);
286 }
287
288 return (0);
289 }
290