1 /*-
2 * Copyright (C) 2010 Nathan Whitehorn
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
21 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
22 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
23 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
28
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 "mmu_if.h"
53 #include "moea64_if.h"
54 #include "ps3-hvcall.h"
55
56 #define VSID_HASH_MASK 0x0000007fffffffffUL
57 #define PTESYNC() __asm __volatile("ptesync")
58
59 extern int ps3fb_remap(void);
60
61 static uint64_t mps3_vas_id;
62
63 /*
64 * Kernel MMU interface
65 */
66
67 static void mps3_bootstrap(mmu_t mmup, vm_offset_t kernelstart,
68 vm_offset_t kernelend);
69 static void mps3_cpu_bootstrap(mmu_t mmup, int ap);
70 static void mps3_pte_synch(mmu_t, uintptr_t pt, struct lpte *pvo_pt);
71 static void mps3_pte_clear(mmu_t, uintptr_t pt, struct lpte *pvo_pt,
72 uint64_t vpn, uint64_t ptebit);
73 static void mps3_pte_unset(mmu_t, uintptr_t pt, struct lpte *pvo_pt,
74 uint64_t vpn);
75 static void mps3_pte_change(mmu_t, uintptr_t pt, struct lpte *pvo_pt,
76 uint64_t vpn);
77 static int mps3_pte_insert(mmu_t, u_int ptegidx, struct lpte *pvo_pt);
78 static uintptr_t mps3_pvo_to_pte(mmu_t, const struct pvo_entry *pvo);
79
80
81 static mmu_method_t mps3_methods[] = {
82 MMUMETHOD(mmu_bootstrap, mps3_bootstrap),
83 MMUMETHOD(mmu_cpu_bootstrap, mps3_cpu_bootstrap),
84
85 MMUMETHOD(moea64_pte_synch, mps3_pte_synch),
86 MMUMETHOD(moea64_pte_clear, mps3_pte_clear),
87 MMUMETHOD(moea64_pte_unset, mps3_pte_unset),
88 MMUMETHOD(moea64_pte_change, mps3_pte_change),
89 MMUMETHOD(moea64_pte_insert, mps3_pte_insert),
90 MMUMETHOD(moea64_pvo_to_pte, mps3_pvo_to_pte),
91
92 { 0, 0 }
93 };
94
95 MMU_DEF_INHERIT(ps3_mmu, "mmu_ps3", mps3_methods, 0, oea64_mmu);
96
97 static void
mps3_bootstrap(mmu_t mmup,vm_offset_t kernelstart,vm_offset_t kernelend)98 mps3_bootstrap(mmu_t mmup, vm_offset_t kernelstart, vm_offset_t kernelend)
99 {
100 uint64_t final_pteg_count;
101
102 moea64_early_bootstrap(mmup, kernelstart, kernelend);
103
104 lv1_construct_virtual_address_space(
105 20 /* log_2(moea64_pteg_count) */, 2 /* n page sizes */,
106 (24UL << 56) | (16UL << 48) /* page sizes 16 MB + 64 KB */,
107 &mps3_vas_id, &final_pteg_count
108 );
109
110 moea64_pteg_count = final_pteg_count / sizeof(struct lpteg);
111
112 moea64_mid_bootstrap(mmup, kernelstart, kernelend);
113 moea64_late_bootstrap(mmup, kernelstart, kernelend);
114 }
115
116 static void
mps3_cpu_bootstrap(mmu_t mmup,int ap)117 mps3_cpu_bootstrap(mmu_t mmup, int ap)
118 {
119 struct slb *slb = PCPU_GET(slb);
120 register_t seg0;
121 int i;
122
123 mtmsr(mfmsr() & ~PSL_DR & ~PSL_IR);
124
125 /*
126 * Destroy the loader's address space if we are coming up for
127 * the first time, and redo the FB mapping so we can continue
128 * having a console.
129 */
130
131 if (!ap)
132 lv1_destruct_virtual_address_space(0);
133
134 lv1_select_virtual_address_space(mps3_vas_id);
135
136 if (!ap)
137 ps3fb_remap();
138
139 /*
140 * Install kernel SLB entries
141 */
142
143 __asm __volatile ("slbia");
144 __asm __volatile ("slbmfee %0,%1; slbie %0;" : "=r"(seg0) : "r"(0));
145 for (i = 0; i < 64; i++) {
146 if (!(slb[i].slbe & SLBE_VALID))
147 continue;
148
149 __asm __volatile ("slbmte %0, %1" ::
150 "r"(slb[i].slbv), "r"(slb[i].slbe));
151 }
152 }
153
154 static void
mps3_pte_synch(mmu_t mmu,uintptr_t slot,struct lpte * pvo_pt)155 mps3_pte_synch(mmu_t mmu, uintptr_t slot, struct lpte *pvo_pt)
156 {
157 uint64_t halfbucket[4], rcbits;
158
159 PTESYNC();
160 lv1_read_htab_entries(mps3_vas_id, slot & ~0x3UL, &halfbucket[0],
161 &halfbucket[1], &halfbucket[2], &halfbucket[3], &rcbits);
162
163 /*
164 * rcbits contains the low 12 bits of each PTEs 2nd part,
165 * spaced at 16-bit intervals
166 */
167
168 KASSERT((halfbucket[slot & 0x3] & LPTE_AVPN_MASK) ==
169 (pvo_pt->pte_hi & LPTE_AVPN_MASK),
170 ("PTE upper word %#lx != %#lx\n",
171 halfbucket[slot & 0x3], pvo_pt->pte_hi));
172
173 pvo_pt->pte_lo |= (rcbits >> ((3 - (slot & 0x3))*16)) &
174 (LPTE_CHG | LPTE_REF);
175 }
176
177 static void
mps3_pte_clear(mmu_t mmu,uintptr_t slot,struct lpte * pvo_pt,uint64_t vpn,u_int64_t ptebit)178 mps3_pte_clear(mmu_t mmu, uintptr_t slot, struct lpte *pvo_pt, uint64_t vpn,
179 u_int64_t ptebit)
180 {
181
182 lv1_write_htab_entry(mps3_vas_id, slot, pvo_pt->pte_hi,
183 pvo_pt->pte_lo & ~ptebit);
184 }
185
186 static void
mps3_pte_unset(mmu_t mmu,uintptr_t slot,struct lpte * pvo_pt,uint64_t vpn)187 mps3_pte_unset(mmu_t mmu, uintptr_t slot, struct lpte *pvo_pt, uint64_t vpn)
188 {
189
190 mps3_pte_synch(mmu, slot, pvo_pt);
191 pvo_pt->pte_hi &= ~LPTE_VALID;
192 lv1_write_htab_entry(mps3_vas_id, slot, 0, 0);
193 moea64_pte_valid--;
194 }
195
196 static void
mps3_pte_change(mmu_t mmu,uintptr_t slot,struct lpte * pvo_pt,uint64_t vpn)197 mps3_pte_change(mmu_t mmu, uintptr_t slot, struct lpte *pvo_pt, uint64_t vpn)
198 {
199
200 mps3_pte_synch(mmu, slot, pvo_pt);
201 lv1_write_htab_entry(mps3_vas_id, slot, pvo_pt->pte_hi,
202 pvo_pt->pte_lo);
203 }
204
205 static int
mps3_pte_insert(mmu_t mmu,u_int ptegidx,struct lpte * pvo_pt)206 mps3_pte_insert(mmu_t mmu, u_int ptegidx, struct lpte *pvo_pt)
207 {
208 int result;
209 struct lpte evicted;
210 struct pvo_entry *pvo;
211 uint64_t index;
212
213 pvo_pt->pte_hi |= LPTE_VALID;
214 pvo_pt->pte_hi &= ~LPTE_HID;
215 evicted.pte_hi = 0;
216 PTESYNC();
217 result = lv1_insert_htab_entry(mps3_vas_id, ptegidx << 3,
218 pvo_pt->pte_hi, pvo_pt->pte_lo, LPTE_LOCKED | LPTE_WIRED, 0,
219 &index, &evicted.pte_hi, &evicted.pte_lo);
220
221 if (result != 0) {
222 /* No freeable slots in either PTEG? We're hosed. */
223 panic("mps3_pte_insert: overflow (%d)", result);
224 return (-1);
225 }
226
227 /*
228 * See where we ended up.
229 */
230 if (index >> 3 != ptegidx)
231 pvo_pt->pte_hi |= LPTE_HID;
232
233 moea64_pte_valid++;
234
235 if (!evicted.pte_hi)
236 return (index & 0x7);
237
238 /*
239 * Synchronize the sacrifice PTE with its PVO, then mark both
240 * invalid. The PVO will be reused when/if the VM system comes
241 * here after a fault.
242 */
243
244 ptegidx = index >> 3; /* Where the sacrifice PTE was found */
245 if (evicted.pte_hi & LPTE_HID)
246 ptegidx ^= moea64_pteg_mask; /* PTEs indexed by primary */
247
248 KASSERT((evicted.pte_hi & (LPTE_WIRED | LPTE_LOCKED)) == 0,
249 ("Evicted a wired PTE"));
250
251 result = 0;
252 LIST_FOREACH(pvo, &moea64_pvo_table[ptegidx], pvo_olink) {
253 if (!PVO_PTEGIDX_ISSET(pvo))
254 continue;
255
256 if (pvo->pvo_pte.lpte.pte_hi == (evicted.pte_hi | LPTE_VALID)) {
257 KASSERT(pvo->pvo_pte.lpte.pte_hi & LPTE_VALID,
258 ("Invalid PVO for valid PTE!"));
259 pvo->pvo_pte.lpte.pte_hi &= ~LPTE_VALID;
260 pvo->pvo_pte.lpte.pte_lo |=
261 evicted.pte_lo & (LPTE_REF | LPTE_CHG);
262 PVO_PTEGIDX_CLR(pvo);
263 moea64_pte_valid--;
264 moea64_pte_overflow++;
265 result = 1;
266 break;
267 }
268 }
269
270 KASSERT(result == 1, ("PVO for sacrifice PTE not found"));
271
272 return (index & 0x7);
273 }
274
275 static __inline u_int
va_to_pteg(uint64_t vsid,vm_offset_t addr,int large)276 va_to_pteg(uint64_t vsid, vm_offset_t addr, int large)
277 {
278 uint64_t hash;
279 int shift;
280
281 shift = large ? moea64_large_page_shift : ADDR_PIDX_SHFT;
282 hash = (vsid & VSID_HASH_MASK) ^ (((uint64_t)addr & ADDR_PIDX) >>
283 shift);
284 return (hash & moea64_pteg_mask);
285 }
286
287 uintptr_t
mps3_pvo_to_pte(mmu_t mmu,const struct pvo_entry * pvo)288 mps3_pvo_to_pte(mmu_t mmu, const struct pvo_entry *pvo)
289 {
290 uint64_t vsid;
291 u_int ptegidx;
292
293 /* If the PTEG index is not set, then there is no page table entry */
294 if (!PVO_PTEGIDX_ISSET(pvo))
295 return (-1);
296
297 vsid = PVO_VSID(pvo);
298 ptegidx = va_to_pteg(vsid, PVO_VADDR(pvo), pvo->pvo_vaddr & PVO_LARGE);
299
300 /*
301 * We can find the actual pte entry without searching by grabbing
302 * the PTEG index from 3 unused bits in pvo_vaddr and by
303 * noticing the HID bit.
304 */
305 if (pvo->pvo_pte.lpte.pte_hi & LPTE_HID)
306 ptegidx ^= moea64_pteg_mask;
307
308 return ((ptegidx << 3) | PVO_PTEGIDX_GET(pvo));
309 }
310
311