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: src/sys/i386/include/pmap.h,v 1.112.2.3 2005/01/31 23:26:04 imp Exp $
42 */
43
44 #ifndef _MACHINE_PMAP_H_
45 #define _MACHINE_PMAP_H_
46
47 /*
48 * Page-directory and page-table entires 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_G 0x100 /* G Global */
61 #define PG_AVAIL1 0x200 /* / Available for system */
62 #define PG_AVAIL2 0x400 /* < programmers use */
63 #define PG_AVAIL3 0x800 /* \ */
64
65
66 /* Our various interpretations of the above */
67 #define PG_W PG_AVAIL1 /* "Wired" pseudoflag */
68 #define PG_MANAGED PG_AVAIL2
69 #define PG_FRAME (~((vm_paddr_t)PAGE_MASK))
70 #define PG_PROT (PG_RW|PG_U) /* all protection bits . */
71 #define PG_N (PG_NC_PWT|PG_NC_PCD) /* Non-cacheable */
72
73 /*
74 * Page Protection Exception bits
75 */
76
77 #define PGEX_P 0x01 /* Protection violation vs. not present */
78 #define PGEX_W 0x02 /* during a Write cycle */
79 #define PGEX_U 0x04 /* access from User mode (UPL) */
80
81 /*
82 * Size of Kernel address space. This is the number of page table pages
83 * (4MB each) to use for the kernel. 256 pages == 1 Gigabyte.
84 * This **MUST** be a multiple of 4 (eg: 252, 256, 260, etc).
85 */
86 #ifndef KVA_PAGES
87 #ifdef PAE
88 #define KVA_PAGES 512
89 #else
90 #define KVA_PAGES 256
91 #endif
92 #endif
93
94 /*
95 * Pte related macros
96 */
97 #define VADDR(pdi, pti) ((vm_offset_t)(((pdi)<<PDRSHIFT)|((pti)<<PAGE_SHIFT)))
98
99 /* Actual number of kernel page tables */
100 #ifndef NKPT
101 #ifdef PAE
102 #define NKPT 240 /* Enough for 16GB (2MB page tables) */
103 #else
104 #define NKPT 30 /* Enough for 4GB (4MB page tables) */
105 #endif
106 #endif
107 #ifndef NKPDE
108 #ifdef SMP
109 #define NKPDE (KVA_PAGES - 1) /* number of page tables/pde's */
110 #else
111 #define NKPDE (KVA_PAGES) /* number of page tables/pde's */
112 #endif
113 #endif
114
115 /*
116 * The *PTDI values control the layout of virtual memory
117 *
118 * XXX This works for now, but I am not real happy with it, I'll fix it
119 * right after I fix locore.s and the magic 28K hole
120 *
121 * SMP_PRIVPAGES: The per-cpu address space is 0xff80000 -> 0xffbfffff
122 */
123 #ifdef SMP
124 #define MPPTDI (NPDEPTD-1) /* per cpu ptd entry */
125 #define KPTDI (MPPTDI-NKPDE) /* start of kernel virtual pde's */
126 #else
127 #define KPTDI (NPDEPTD-NKPDE)/* start of kernel virtual pde's */
128 #endif /* SMP */
129 #define PTDPTDI (KPTDI-NPGPTD) /* ptd entry that points to ptd! */
130
131 /*
132 * XXX doesn't really belong here I guess...
133 */
134 #define ISA_HOLE_START 0xa0000
135 #define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START)
136
137 #ifndef LOCORE
138
139 #include <sys/queue.h>
140 #include <sys/_lock.h>
141 #include <sys/_mutex.h>
142
143 #ifdef PAE
144
145 typedef uint64_t pdpt_entry_t;
146 typedef uint64_t pd_entry_t;
147 typedef uint64_t pt_entry_t;
148
149 #define PTESHIFT (3)
150 #define PDESHIFT (3)
151
152 #else
153
154 typedef uint32_t pd_entry_t;
155 typedef uint32_t pt_entry_t;
156
157 #define PTESHIFT (2)
158 #define PDESHIFT (2)
159
160 #endif
161
162 /*
163 * Address of current and alternate address space page table maps
164 * and directories.
165 */
166 #ifdef _KERNEL
167 extern pt_entry_t PTmap[];
168 extern pd_entry_t PTD[];
169 extern pd_entry_t PTDpde[];
170
171 #ifdef PAE
172 extern pdpt_entry_t *IdlePDPT;
173 #endif
174 extern pd_entry_t *IdlePTD; /* physical address of "Idle" state directory */
175 #endif
176
177 #ifdef _KERNEL
178 /*
179 * virtual address to page table entry and
180 * to physical address. Likewise for alternate address space.
181 * Note: these work recursively, thus vtopte of a pte will give
182 * the corresponding pde that in turn maps it.
183 */
184 #define vtopte(va) (PTmap + i386_btop(va))
185
186 /*
187 * Routine: pmap_kextract
188 * Function:
189 * Extract the physical page address associated
190 * kernel virtual address.
191 */
192 static __inline vm_paddr_t
193 pmap_kextract(vm_offset_t va)
194 {
195 vm_paddr_t pa;
196
197 if ((pa = PTD[va >> PDRSHIFT]) & PG_PS) {
198 pa = (pa & ~(NBPDR - 1)) | (va & (NBPDR - 1));
199 } else {
200 pa = *vtopte(va);
201 pa = (pa & PG_FRAME) | (va & PAGE_MASK);
202 }
203 return pa;
204 }
205
206 #define vtophys(va) pmap_kextract(((vm_offset_t) (va)))
207
208 #ifdef PAE
209
210 static __inline pt_entry_t
211 pte_load(pt_entry_t *ptep)
212 {
213 pt_entry_t r;
214
215 __asm __volatile(
216 "lock; cmpxchg8b %1"
217 : "=A" (r)
218 : "m" (*ptep), "a" (0), "d" (0), "b" (0), "c" (0));
219 return (r);
220 }
221
222 static __inline pt_entry_t
223 pte_load_store(pt_entry_t *ptep, pt_entry_t v)
224 {
225 pt_entry_t r;
226
227 r = *ptep;
228 __asm __volatile(
229 "1:\n"
230 "\tlock; cmpxchg8b %1\n"
231 "\tjnz 1b"
232 : "+A" (r)
233 : "m" (*ptep), "b" ((uint32_t)v), "c" ((uint32_t)(v >> 32)));
234 return (r);
235 }
236
237 #define pte_load_clear(ptep) pte_load_store((ptep), (pt_entry_t)0ULL)
238
239 #define pte_store(ptep, pte) pte_load_store((ptep), (pt_entry_t)pte)
240
241 #else /* PAE */
242
243 static __inline pt_entry_t
244 pte_load(pt_entry_t *ptep)
245 {
246 pt_entry_t r;
247
248 r = *ptep;
249 return (r);
250 }
251
252 static __inline pt_entry_t
253 pte_load_store(pt_entry_t *ptep, pt_entry_t pte)
254 {
255 pt_entry_t r;
256
257 __asm __volatile(
258 "xchgl %0,%1"
259 : "=m" (*ptep),
260 "=r" (r)
261 : "1" (pte),
262 "m" (*ptep));
263 return (r);
264 }
265
266 #define pte_load_clear(pte) atomic_readandclear_int(pte)
267
268 static __inline void
269 pte_store(pt_entry_t *ptep, pt_entry_t pte)
270 {
271
272 *ptep = pte;
273 }
274
275 #endif /* PAE */
276
277 #define pte_clear(ptep) pte_store((ptep), (pt_entry_t)0ULL)
278
279 #define pde_store(pdep, pde) pte_store((pdep), (pde))
280
281 #endif /* _KERNEL */
282
283 /*
284 * Pmap stuff
285 */
286 struct pv_entry;
287
288 struct md_page {
289 int pv_list_count;
290 TAILQ_HEAD(,pv_entry) pv_list;
291 };
292
293 struct pmap {
294 struct mtx pm_mtx;
295 pd_entry_t *pm_pdir; /* KVA of page directory */
296 TAILQ_HEAD(,pv_entry) pm_pvlist; /* list of mappings in pmap */
297 u_int pm_active; /* active on cpus */
298 struct pmap_statistics pm_stats; /* pmap statistics */
299 LIST_ENTRY(pmap) pm_list; /* List of all pmaps */
300 #ifdef PAE
301 pdpt_entry_t *pm_pdpt; /* KVA of page director pointer
302 table */
303 #endif
304 };
305
306 typedef struct pmap *pmap_t;
307
308 #ifdef _KERNEL
309 extern struct pmap kernel_pmap_store;
310 #define kernel_pmap (&kernel_pmap_store)
311
312 #define PMAP_LOCK(pmap) mtx_lock(&(pmap)->pm_mtx)
313 #define PMAP_LOCK_ASSERT(pmap, type) \
314 mtx_assert(&(pmap)->pm_mtx, (type))
315 #define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx)
316 #define PMAP_LOCK_INIT(pmap) mtx_init(&(pmap)->pm_mtx, "pmap", \
317 NULL, MTX_DEF | MTX_DUPOK)
318 #define PMAP_LOCKED(pmap) mtx_owned(&(pmap)->pm_mtx)
319 #define PMAP_MTX(pmap) (&(pmap)->pm_mtx)
320 #define PMAP_TRYLOCK(pmap) mtx_trylock(&(pmap)->pm_mtx)
321 #define PMAP_UNLOCK(pmap) mtx_unlock(&(pmap)->pm_mtx)
322 #endif
323
324 /*
325 * For each vm_page_t, there is a list of all currently valid virtual
326 * mappings of that page. An entry is a pv_entry_t, the list is pv_table.
327 */
328 typedef struct pv_entry {
329 pmap_t pv_pmap; /* pmap where mapping lies */
330 vm_offset_t pv_va; /* virtual address for mapping */
331 TAILQ_ENTRY(pv_entry) pv_list;
332 TAILQ_ENTRY(pv_entry) pv_plist;
333 } *pv_entry_t;
334
335 #ifdef _KERNEL
336
337 #define NPPROVMTRR 8
338 #define PPRO_VMTRRphysBase0 0x200
339 #define PPRO_VMTRRphysMask0 0x201
340 struct ppro_vmtrr {
341 u_int64_t base, mask;
342 };
343 extern struct ppro_vmtrr PPro_vmtrr[NPPROVMTRR];
344
345 extern caddr_t CADDR1;
346 extern pt_entry_t *CMAP1;
347 extern vm_paddr_t avail_end;
348 extern vm_paddr_t phys_avail[];
349 extern int pseflag;
350 extern int pgeflag;
351 extern char *ptvmmap; /* poor name! */
352 extern vm_offset_t virtual_avail;
353 extern vm_offset_t virtual_end;
354
355 #define pmap_page_is_mapped(m) (!TAILQ_EMPTY(&(m)->md.pv_list))
356
357 void pmap_bootstrap(vm_paddr_t, vm_paddr_t);
358 void pmap_kenter(vm_offset_t va, vm_paddr_t pa);
359 void *pmap_kenter_temporary(vm_paddr_t pa, int i);
360 void pmap_kremove(vm_offset_t);
361 void *pmap_mapdev(vm_paddr_t, vm_size_t);
362 void pmap_unmapdev(vm_offset_t, vm_size_t);
363 pt_entry_t *pmap_pte(pmap_t, vm_offset_t) __pure2;
364 void pmap_set_pg(void);
365 void pmap_invalidate_page(pmap_t, vm_offset_t);
366 void pmap_invalidate_range(pmap_t, vm_offset_t, vm_offset_t);
367 void pmap_invalidate_all(pmap_t);
368
369 #endif /* _KERNEL */
370
371 #endif /* !LOCORE */
372
373 #endif /* !_MACHINE_PMAP_H_ */
Cache object: 396ccef8acddd3c4fc92af7386a92183
|