1 /*
2 * Copyright (c) 2003 Peter Wemm.
3 * Copyright (c) 1991 Regents of the University of California.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * the Systems Programming Group of the University of Utah Computer
8 * Science Department and William Jolitz of UUNET Technologies Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * Derived from hp300 version by Mike Hibler, this version by William
35 * Jolitz uses a recursive map [a pde points to the page directory] to
36 * map the page tables using the pagetables themselves. This is done to
37 * reduce the impact on kernel virtual memory for lots of sparse address
38 * space, and to reduce the cost of memory to each process.
39 *
40 * from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
41 * from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
42 * $FreeBSD: releng/5.3/sys/amd64/include/pmap.h 136358 2004-10-10 19:08:00Z alc $
43 */
44
45 #ifndef _MACHINE_PMAP_H_
46 #define _MACHINE_PMAP_H_
47
48 /*
49 * Page-directory and page-table entires follow this format, with a few
50 * of the fields not present here and there, depending on a lot of things.
51 */
52 /* ---- Intel Nomenclature ---- */
53 #define PG_V 0x001 /* P Valid */
54 #define PG_RW 0x002 /* R/W Read/Write */
55 #define PG_U 0x004 /* U/S User/Supervisor */
56 #define PG_NC_PWT 0x008 /* PWT Write through */
57 #define PG_NC_PCD 0x010 /* PCD Cache disable */
58 #define PG_A 0x020 /* A Accessed */
59 #define PG_M 0x040 /* D Dirty */
60 #define PG_PS 0x080 /* PS Page size (0=4k,1=4M) */
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_NX (1ul<<63) /* No-execute */
66
67
68 /* Our various interpretations of the above */
69 #define PG_W PG_AVAIL1 /* "Wired" pseudoflag */
70 #define PG_MANAGED PG_AVAIL2
71 #define PG_FRAME (0x000ffffffffff000ul)
72 #define PG_PROT (PG_RW|PG_U) /* all protection bits . */
73 #define PG_N (PG_NC_PWT|PG_NC_PCD) /* Non-cacheable */
74
75 /*
76 * Page Protection Exception bits
77 */
78
79 #define PGEX_P 0x01 /* Protection violation vs. not present */
80 #define PGEX_W 0x02 /* during a Write cycle */
81 #define PGEX_U 0x04 /* access from User mode (UPL) */
82
83 /*
84 * Pte related macros. This is complicated by having to deal with
85 * the sign extension of the 48th bit.
86 */
87 #define KVADDR(l4, l3, l2, l1) ( \
88 ((unsigned long)-1 << 47) | \
89 ((unsigned long)(l4) << PML4SHIFT) | \
90 ((unsigned long)(l3) << PDPSHIFT) | \
91 ((unsigned long)(l2) << PDRSHIFT) | \
92 ((unsigned long)(l1) << PAGE_SHIFT))
93
94 #define UVADDR(l4, l3, l2, l1) ( \
95 ((unsigned long)(l4) << PML4SHIFT) | \
96 ((unsigned long)(l3) << PDPSHIFT) | \
97 ((unsigned long)(l2) << PDRSHIFT) | \
98 ((unsigned long)(l1) << PAGE_SHIFT))
99
100 /* Initial number of kernel page tables */
101 #ifndef NKPT
102 #define NKPT 240 /* Enough for 16GB (2MB page tables) */
103 #endif
104
105 #define NKPML4E 1 /* number of kernel PML4 slots */
106 #define NKPDPE 1 /* number of kernel PDP slots */
107 #define NKPDE (NKPDPE*NPDEPG) /* number of kernel PD slots */
108
109 #define NUPML4E (NPML4EPG/2) /* number of userland PML4 pages */
110 #define NUPDPE (NUPML4E*NPDPEPG)/* number of userland PDP pages */
111 #define NUPDE (NUPDPE*NPDEPG) /* number of userland PD entries */
112
113 #define NDMPML4E 1 /* number of dmap PML4 slots */
114
115 /*
116 * The *PDI values control the layout of virtual memory
117 */
118 #define PML4PML4I (NPML4EPG/2) /* Index of recursive pml4 mapping */
119
120 #define KPML4I (NPML4EPG-1) /* Top 512GB for KVM */
121 #define DMPML4I (KPML4I-1) /* Next 512GB down for direct map */
122
123 #define KPDPI (NPDPEPG-2) /* kernbase at -2GB */
124
125 /*
126 * XXX doesn't really belong here I guess...
127 */
128 #define ISA_HOLE_START 0xa0000
129 #define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START)
130
131 #ifndef LOCORE
132
133 #include <sys/queue.h>
134 #include <sys/_lock.h>
135 #include <sys/_mutex.h>
136
137 typedef u_int64_t pd_entry_t;
138 typedef u_int64_t pt_entry_t;
139 typedef u_int64_t pdp_entry_t;
140 typedef u_int64_t pml4_entry_t;
141
142 #define PML4ESHIFT (3)
143 #define PDPESHIFT (3)
144 #define PTESHIFT (3)
145 #define PDESHIFT (3)
146
147 /*
148 * Address of current and alternate address space page table maps
149 * and directories.
150 * XXX it might be saner to just direct map all of physical memory
151 * into the kernel using 2MB pages. We have enough space to do
152 * it (2^47 bits of KVM, while current max physical addressability
153 * is 2^40 physical bits). Then we can get rid of the evil hole
154 * in the page tables and the evil overlapping.
155 */
156 #ifdef _KERNEL
157 #define addr_PTmap (KVADDR(PML4PML4I, 0, 0, 0))
158 #define addr_PDmap (KVADDR(PML4PML4I, PML4PML4I, 0, 0))
159 #define addr_PDPmap (KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, 0))
160 #define addr_PML4map (KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I))
161 #define addr_PML4pml4e (addr_PML4map + (PML4PML4I * sizeof(pml4_entry_t)))
162 #define PTmap ((pt_entry_t *)(addr_PTmap))
163 #define PDmap ((pd_entry_t *)(addr_PDmap))
164 #define PDPmap ((pd_entry_t *)(addr_PDPmap))
165 #define PML4map ((pd_entry_t *)(addr_PML4map))
166 #define PML4pml4e ((pd_entry_t *)(addr_PML4pml4e))
167
168 extern u_int64_t KPML4phys; /* physical address of kernel level 4 */
169 #endif
170
171 #ifdef _KERNEL
172 /*
173 * virtual address to page table entry and
174 * to physical address. Likewise for alternate address space.
175 * Note: these work recursively, thus vtopte of a pte will give
176 * the corresponding pde that in turn maps it.
177 */
178 pt_entry_t *vtopte(vm_offset_t);
179 vm_paddr_t pmap_kextract(vm_offset_t);
180
181 #define vtophys(va) pmap_kextract(((vm_offset_t) (va)))
182
183 static __inline pt_entry_t
184 pte_load(pt_entry_t *ptep)
185 {
186 pt_entry_t r;
187
188 r = *ptep;
189 return (r);
190 }
191
192 static __inline pt_entry_t
193 pte_load_store(pt_entry_t *ptep, pt_entry_t pte)
194 {
195 pt_entry_t r;
196
197 __asm __volatile(
198 "xchgq %0,%1"
199 : "=m" (*ptep),
200 "=r" (r)
201 : "1" (pte),
202 "m" (*ptep));
203 return (r);
204 }
205
206 #define pte_load_clear(pte) atomic_readandclear_long(pte)
207
208 static __inline void
209 pte_store(pt_entry_t *ptep, pt_entry_t pte)
210 {
211
212 *ptep = pte;
213 }
214
215 #define pte_clear(ptep) pte_store((ptep), (pt_entry_t)0ULL)
216
217 #define pde_store(pdep, pde) pte_store((pdep), (pde))
218
219 extern pt_entry_t pg_nx;
220
221 #endif /* _KERNEL */
222
223 /*
224 * Pmap stuff
225 */
226 struct pv_entry;
227
228 struct md_page {
229 int pv_list_count;
230 TAILQ_HEAD(,pv_entry) pv_list;
231 };
232
233 struct pmap {
234 struct mtx pm_mtx;
235 pml4_entry_t *pm_pml4; /* KVA of level 4 page table */
236 TAILQ_HEAD(,pv_entry) pm_pvlist; /* list of mappings in pmap */
237 u_int pm_active; /* active on cpus */
238 /* spare u_int here due to padding */
239 struct pmap_statistics pm_stats; /* pmap statistics */
240 };
241
242 typedef struct pmap *pmap_t;
243
244 #ifdef _KERNEL
245 extern struct pmap kernel_pmap_store;
246 #define kernel_pmap (&kernel_pmap_store)
247
248 #define PMAP_LOCK(pmap) mtx_lock(&(pmap)->pm_mtx)
249 #define PMAP_LOCK_ASSERT(pmap, type) \
250 mtx_assert(&(pmap)->pm_mtx, (type))
251 #define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx)
252 #define PMAP_LOCK_INIT(pmap) mtx_init(&(pmap)->pm_mtx, "pmap", \
253 NULL, MTX_DEF | MTX_DUPOK)
254 #define PMAP_LOCKED(pmap) mtx_owned(&(pmap)->pm_mtx)
255 #define PMAP_MTX(pmap) (&(pmap)->pm_mtx)
256 #define PMAP_TRYLOCK(pmap) mtx_trylock(&(pmap)->pm_mtx)
257 #define PMAP_UNLOCK(pmap) mtx_unlock(&(pmap)->pm_mtx)
258 #endif
259
260 /*
261 * For each vm_page_t, there is a list of all currently valid virtual
262 * mappings of that page. An entry is a pv_entry_t, the list is pv_table.
263 */
264 typedef struct pv_entry {
265 pmap_t pv_pmap; /* pmap where mapping lies */
266 vm_offset_t pv_va; /* virtual address for mapping */
267 TAILQ_ENTRY(pv_entry) pv_list;
268 TAILQ_ENTRY(pv_entry) pv_plist;
269 } *pv_entry_t;
270
271 #ifdef _KERNEL
272
273 #define NPPROVMTRR 8
274 #define PPRO_VMTRRphysBase0 0x200
275 #define PPRO_VMTRRphysMask0 0x201
276 struct ppro_vmtrr {
277 u_int64_t base, mask;
278 };
279 extern struct ppro_vmtrr PPro_vmtrr[NPPROVMTRR];
280
281 extern caddr_t CADDR1;
282 extern pt_entry_t *CMAP1;
283 extern vm_paddr_t avail_end;
284 extern vm_paddr_t phys_avail[];
285 extern vm_offset_t virtual_avail;
286 extern vm_offset_t virtual_end;
287
288 #define pmap_page_is_mapped(m) (!TAILQ_EMPTY(&(m)->md.pv_list))
289
290 void pmap_bootstrap(vm_paddr_t *);
291 void pmap_kenter(vm_offset_t va, vm_paddr_t pa);
292 void *pmap_kenter_temporary(vm_paddr_t pa, int i);
293 void pmap_kremove(vm_offset_t);
294 void *pmap_mapdev(vm_paddr_t, vm_size_t);
295 void pmap_unmapdev(vm_offset_t, vm_size_t);
296 void pmap_invalidate_page(pmap_t, vm_offset_t);
297 void pmap_invalidate_range(pmap_t, vm_offset_t, vm_offset_t);
298 void pmap_invalidate_all(pmap_t);
299
300 #endif /* _KERNEL */
301
302 #endif /* !LOCORE */
303
304 #endif /* !_MACHINE_PMAP_H_ */
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