1 /*-
2 * Copyright (c) 1991 Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * the Systems Programming Group of the University of Utah Computer
7 * Science Department and William Jolitz of UUNET Technologies Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * Derived from hp300 version by Mike Hibler, this version by William
34 * Jolitz uses a recursive map [a pde points to the page directory] to
35 * map the page tables using the pagetables themselves. This is done to
36 * reduce the impact on kernel virtual memory for lots of sparse address
37 * space, and to reduce the cost of memory to each process.
38 *
39 * from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
40 * from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
41 * $FreeBSD$
42 */
43
44 #ifndef _MACHINE_PMAP_H_
45 #define _MACHINE_PMAP_H_
46
47 /*
48 * Page-directory and page-table entries follow this format, with a few
49 * of the fields not present here and there, depending on a lot of things.
50 */
51 /* ---- Intel Nomenclature ---- */
52 #define PG_V 0x001 /* P Valid */
53 #define PG_RW 0x002 /* R/W Read/Write */
54 #define PG_U 0x004 /* U/S User/Supervisor */
55 #define PG_NC_PWT 0x008 /* PWT Write through */
56 #define PG_NC_PCD 0x010 /* PCD Cache disable */
57 #define PG_A 0x020 /* A Accessed */
58 #define PG_M 0x040 /* D Dirty */
59 #define PG_PS 0x080 /* PS Page size (0=4k,1=4M) */
60 #define PG_PTE_PAT 0x080 /* PAT PAT index */
61 #define PG_G 0x100 /* G Global */
62 #define PG_AVAIL1 0x200 /* / Available for system */
63 #define PG_AVAIL2 0x400 /* < programmers use */
64 #define PG_AVAIL3 0x800 /* \ */
65 #define PG_PDE_PAT 0x1000 /* PAT PAT index */
66 #if defined(PAE) || defined(PAE_TABLES)
67 #define PG_NX (1ull<<63) /* No-execute */
68 #endif
69
70
71 /* Our various interpretations of the above */
72 #define PG_W PG_AVAIL1 /* "Wired" pseudoflag */
73 #define PG_MANAGED PG_AVAIL2
74 #define PG_PROMOTED PG_AVAIL3 /* PDE only */
75 #if defined(PAE) || defined(PAE_TABLES)
76 #define PG_FRAME (0x000ffffffffff000ull)
77 #define PG_PS_FRAME (0x000fffffffe00000ull)
78 #else
79 #define PG_FRAME (~PAGE_MASK)
80 #define PG_PS_FRAME (0xffc00000)
81 #endif
82 #define PG_PROT (PG_RW|PG_U) /* all protection bits . */
83 #define PG_N (PG_NC_PWT|PG_NC_PCD) /* Non-cacheable */
84
85 /* Page level cache control fields used to determine the PAT type */
86 #define PG_PDE_CACHE (PG_PDE_PAT | PG_NC_PWT | PG_NC_PCD)
87 #define PG_PTE_CACHE (PG_PTE_PAT | PG_NC_PWT | PG_NC_PCD)
88
89 /*
90 * Promotion to a 2 or 4MB (PDE) page mapping requires that the corresponding
91 * 4KB (PTE) page mappings have identical settings for the following fields:
92 */
93 #define PG_PTE_PROMOTE (PG_MANAGED | PG_W | PG_G | PG_PTE_PAT | \
94 PG_M | PG_A | PG_NC_PCD | PG_NC_PWT | PG_U | PG_RW | PG_V)
95
96 /*
97 * Page Protection Exception bits
98 */
99
100 #define PGEX_P 0x01 /* Protection violation vs. not present */
101 #define PGEX_W 0x02 /* during a Write cycle */
102 #define PGEX_U 0x04 /* access from User mode (UPL) */
103 #define PGEX_RSV 0x08 /* reserved PTE field is non-zero */
104 #define PGEX_I 0x10 /* during an instruction fetch */
105
106 /*
107 * Size of Kernel address space. This is the number of page table pages
108 * (4MB each) to use for the kernel. 256 pages == 1 Gigabyte.
109 * This **MUST** be a multiple of 4 (eg: 252, 256, 260, etc).
110 * For PAE, the page table page unit size is 2MB. This means that 512 pages
111 * is 1 Gigabyte. Double everything. It must be a multiple of 8 for PAE.
112 */
113 #ifndef KVA_PAGES
114 #if defined(PAE) || defined(PAE_TABLES)
115 #define KVA_PAGES 512
116 #else
117 #define KVA_PAGES 256
118 #endif
119 #endif
120
121 /*
122 * Pte related macros
123 */
124 #define VADDR(pdi, pti) ((vm_offset_t)(((pdi)<<PDRSHIFT)|((pti)<<PAGE_SHIFT)))
125
126 /*
127 * The initial number of kernel page table pages that are constructed
128 * by locore must be sufficient to map vm_page_array. That number can
129 * be calculated as follows:
130 * max_phys / PAGE_SIZE * sizeof(struct vm_page) / NBPDR
131 * PAE: max_phys 16G, sizeof(vm_page) 76, NBPDR 2M, 152 page table pages.
132 * PAE_TABLES: max_phys 4G, sizeof(vm_page) 68, NBPDR 2M, 36 page table pages.
133 * Non-PAE: max_phys 4G, sizeof(vm_page) 68, NBPDR 4M, 18 page table pages.
134 */
135 #ifndef NKPT
136 #if defined(PAE)
137 #define NKPT 240
138 #elif defined(PAE_TABLES)
139 #define NKPT 60
140 #else
141 #define NKPT 30
142 #endif
143 #endif
144
145 #ifndef NKPDE
146 #define NKPDE (KVA_PAGES) /* number of page tables/pde's */
147 #endif
148
149 /*
150 * The *PTDI values control the layout of virtual memory
151 *
152 * XXX This works for now, but I am not real happy with it, I'll fix it
153 * right after I fix locore.s and the magic 28K hole
154 */
155 #define KPTDI (NPDEPTD-NKPDE) /* start of kernel virtual pde's */
156 #define PTDPTDI (KPTDI-NPGPTD) /* ptd entry that points to ptd! */
157
158 /*
159 * XXX doesn't really belong here I guess...
160 */
161 #define ISA_HOLE_START 0xa0000
162 #define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START)
163
164 #ifndef LOCORE
165
166 #include <sys/queue.h>
167 #include <sys/_cpuset.h>
168 #include <sys/_lock.h>
169 #include <sys/_mutex.h>
170
171 #include <vm/_vm_radix.h>
172
173 #if defined(PAE) || defined(PAE_TABLES)
174
175 typedef uint64_t pdpt_entry_t;
176 typedef uint64_t pd_entry_t;
177 typedef uint64_t pt_entry_t;
178
179 #define PTESHIFT (3)
180 #define PDESHIFT (3)
181
182 #else
183
184 typedef uint32_t pd_entry_t;
185 typedef uint32_t pt_entry_t;
186
187 #define PTESHIFT (2)
188 #define PDESHIFT (2)
189
190 #endif
191
192 /*
193 * Address of current address space page table maps and directories.
194 */
195 #ifdef _KERNEL
196 #include <machine/atomic.h>
197
198 extern pt_entry_t PTmap[];
199 extern pd_entry_t PTD[];
200 extern pd_entry_t PTDpde[];
201
202 #if defined(PAE) || defined(PAE_TABLES)
203 extern pdpt_entry_t *IdlePDPT;
204 #endif
205 extern pd_entry_t *IdlePTD; /* physical address of "Idle" state directory */
206
207 /*
208 * Translate a virtual address to the kernel virtual address of its page table
209 * entry (PTE). This can be used recursively. If the address of a PTE as
210 * previously returned by this macro is itself given as the argument, then the
211 * address of the page directory entry (PDE) that maps the PTE will be
212 * returned.
213 *
214 * This macro may be used before pmap_bootstrap() is called.
215 */
216 #define vtopte(va) (PTmap + i386_btop(va))
217
218 /*
219 * Translate a virtual address to its physical address.
220 *
221 * This macro may be used before pmap_bootstrap() is called.
222 */
223 #define vtophys(va) pmap_kextract((vm_offset_t)(va))
224
225 /*
226 * KPTmap is a linear mapping of the kernel page table. It differs from the
227 * recursive mapping in two ways: (1) it only provides access to kernel page
228 * table pages, and not user page table pages, and (2) it provides access to
229 * a kernel page table page after the corresponding virtual addresses have
230 * been promoted to a 2/4MB page mapping.
231 *
232 * KPTmap is first initialized by locore to support just NPKT page table
233 * pages. Later, it is reinitialized by pmap_bootstrap() to allow for
234 * expansion of the kernel page table.
235 */
236 extern pt_entry_t *KPTmap;
237
238 #if (defined(PAE) || defined(PAE_TABLES))
239
240 #define pde_cmpset(pdep, old, new) atomic_cmpset_64_i586(pdep, old, new)
241 #define pte_load_store(ptep, pte) atomic_swap_64_i586(ptep, pte)
242 #define pte_load_clear(ptep) atomic_swap_64_i586(ptep, 0)
243 #define pte_store(ptep, pte) atomic_store_rel_64_i586(ptep, pte)
244 static __inline uint64_t
245 pte_load(pt_entry_t *p)
246 {
247 uint64_t res;
248
249 __asm __volatile(
250 " movl %%ebx,%%eax ; "
251 " movl %%ecx,%%edx ; "
252 " lock; cmpxchg8b %1"
253 : "=&A" (res), /* 0 */
254 "+m" (*p) /* 1 */
255 : : "memory", "cc");
256 return (res);
257 }
258
259 extern pt_entry_t pg_nx;
260
261 #else /* !(PAE || PAE_TABLES) */
262
263 #define pde_cmpset(pdep, old, new) atomic_cmpset_int(pdep, old, new)
264 #define pte_load_store(ptep, pte) atomic_swap_int(ptep, pte)
265 #define pte_load_clear(ptep) atomic_swap_int(ptep, 0)
266 #define pte_store(ptep, pte) do { \
267 *(u_int *)(ptep) = (u_int)(pte); \
268 } while (0)
269 #define pte_load(ptep) atomic_load_acq_int(ptep)
270
271 #endif /* !(PAE || PAE_TABLES) */
272
273 #define pte_clear(ptep) pte_store(ptep, 0)
274
275 #define pde_store(pdep, pde) pte_store(pdep, pde)
276
277 /*
278 * Extract from the kernel page table the physical address that is mapped by
279 * the given virtual address "va".
280 *
281 * This function may be used before pmap_bootstrap() is called.
282 */
283 static __inline vm_paddr_t
284 pmap_kextract(vm_offset_t va)
285 {
286 vm_paddr_t pa;
287
288 if ((pa = pte_load(&PTD[va >> PDRSHIFT])) & PG_PS) {
289 pa = (pa & PG_PS_FRAME) | (va & PDRMASK);
290 } else {
291 /*
292 * Beware of a concurrent promotion that changes the PDE at
293 * this point! For example, vtopte() must not be used to
294 * access the PTE because it would use the new PDE. It is,
295 * however, safe to use the old PDE because the page table
296 * page is preserved by the promotion.
297 */
298 pa = KPTmap[i386_btop(va)];
299 pa = (pa & PG_FRAME) | (va & PAGE_MASK);
300 }
301 return (pa);
302 }
303
304 #endif /* _KERNEL */
305
306 /*
307 * Pmap stuff
308 */
309 struct pv_entry;
310 struct pv_chunk;
311
312 struct md_page {
313 TAILQ_HEAD(,pv_entry) pv_list;
314 int pat_mode;
315 };
316
317 struct pmap {
318 struct mtx pm_mtx;
319 pd_entry_t *pm_pdir; /* KVA of page directory */
320 TAILQ_HEAD(,pv_chunk) pm_pvchunk; /* list of mappings in pmap */
321 cpuset_t pm_active; /* active on cpus */
322 struct pmap_statistics pm_stats; /* pmap statistics */
323 LIST_ENTRY(pmap) pm_list; /* List of all pmaps */
324 #if defined(PAE) || defined(PAE_TABLES)
325 pdpt_entry_t *pm_pdpt; /* KVA of page directory pointer
326 table */
327 #endif
328 struct vm_radix pm_root; /* spare page table pages */
329 };
330
331 typedef struct pmap *pmap_t;
332
333 #ifdef _KERNEL
334 extern struct pmap kernel_pmap_store;
335 #define kernel_pmap (&kernel_pmap_store)
336
337 #define PMAP_LOCK(pmap) mtx_lock(&(pmap)->pm_mtx)
338 #define PMAP_LOCK_ASSERT(pmap, type) \
339 mtx_assert(&(pmap)->pm_mtx, (type))
340 #define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx)
341 #define PMAP_LOCK_INIT(pmap) mtx_init(&(pmap)->pm_mtx, "pmap", \
342 NULL, MTX_DEF | MTX_DUPOK)
343 #define PMAP_LOCKED(pmap) mtx_owned(&(pmap)->pm_mtx)
344 #define PMAP_MTX(pmap) (&(pmap)->pm_mtx)
345 #define PMAP_TRYLOCK(pmap) mtx_trylock(&(pmap)->pm_mtx)
346 #define PMAP_UNLOCK(pmap) mtx_unlock(&(pmap)->pm_mtx)
347 #endif
348
349 /*
350 * For each vm_page_t, there is a list of all currently valid virtual
351 * mappings of that page. An entry is a pv_entry_t, the list is pv_list.
352 */
353 typedef struct pv_entry {
354 vm_offset_t pv_va; /* virtual address for mapping */
355 TAILQ_ENTRY(pv_entry) pv_next;
356 } *pv_entry_t;
357
358 /*
359 * pv_entries are allocated in chunks per-process. This avoids the
360 * need to track per-pmap assignments.
361 */
362 #define _NPCM 11
363 #define _NPCPV 336
364 struct pv_chunk {
365 pmap_t pc_pmap;
366 TAILQ_ENTRY(pv_chunk) pc_list;
367 uint32_t pc_map[_NPCM]; /* bitmap; 1 = free */
368 TAILQ_ENTRY(pv_chunk) pc_lru;
369 struct pv_entry pc_pventry[_NPCPV];
370 };
371
372 #ifdef _KERNEL
373
374 extern caddr_t CADDR3;
375 extern pt_entry_t *CMAP3;
376 extern vm_paddr_t phys_avail[];
377 extern vm_paddr_t dump_avail[];
378 extern int pseflag;
379 extern int pgeflag;
380 extern char *ptvmmap; /* poor name! */
381 extern vm_offset_t virtual_avail;
382 extern vm_offset_t virtual_end;
383
384 #define pmap_page_get_memattr(m) ((vm_memattr_t)(m)->md.pat_mode)
385 #define pmap_page_is_write_mapped(m) (((m)->aflags & PGA_WRITEABLE) != 0)
386 #define pmap_unmapbios(va, sz) pmap_unmapdev((va), (sz))
387
388 /*
389 * Only the following functions or macros may be used before pmap_bootstrap()
390 * is called: pmap_kenter(), pmap_kextract(), pmap_kremove(), vtophys(), and
391 * vtopte().
392 */
393 void pmap_activate_boot(pmap_t pmap);
394 void pmap_bootstrap(vm_paddr_t);
395 int pmap_cache_bits(int mode, boolean_t is_pde);
396 int pmap_change_attr(vm_offset_t, vm_size_t, int);
397 void pmap_init_pat(void);
398 void pmap_kenter(vm_offset_t va, vm_paddr_t pa);
399 void *pmap_kenter_temporary(vm_paddr_t pa, int i);
400 void pmap_kremove(vm_offset_t);
401 void *pmap_mapbios(vm_paddr_t, vm_size_t);
402 void *pmap_mapdev(vm_paddr_t, vm_size_t);
403 void *pmap_mapdev_attr(vm_paddr_t, vm_size_t, int);
404 boolean_t pmap_page_is_mapped(vm_page_t m);
405 void pmap_page_set_memattr(vm_page_t m, vm_memattr_t ma);
406 void pmap_unmapdev(vm_offset_t, vm_size_t);
407 pt_entry_t *pmap_pte(pmap_t, vm_offset_t) __pure2;
408 void pmap_invalidate_page(pmap_t, vm_offset_t);
409 void pmap_invalidate_range(pmap_t, vm_offset_t, vm_offset_t);
410 void pmap_invalidate_all(pmap_t);
411 void pmap_invalidate_cache(void);
412 void pmap_invalidate_cache_pages(vm_page_t *pages, int count);
413 void pmap_invalidate_cache_range(vm_offset_t sva, vm_offset_t eva,
414 boolean_t force);
415
416 void invltlb_glob(void);
417
418 #endif /* _KERNEL */
419
420 #endif /* !LOCORE */
421
422 #endif /* !_MACHINE_PMAP_H_ */
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