2 * Copyright (c) 1991 Regents of the University of California.
3 * Copyright (c) 2003 Peter Wemm.
4 * Copyright (c) 2008 The DragonFly Project.
7 * This code is derived from software contributed to Berkeley by
8 * the Systems Programming Group of the University of Utah Computer
9 * Science Department and William Jolitz of UUNET Technologies Inc.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * Derived from hp300 version by Mike Hibler, this version by William
40 * Jolitz uses a recursive map [a pde points to the page directory] to
41 * map the page tables using the pagetables themselves. This is done to
42 * reduce the impact on kernel virtual memory for lots of sparse address
43 * space, and to reduce the cost of memory to each process.
45 * from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
46 * from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
47 * $FreeBSD: src/sys/i386/include/pmap.h,v 1.65.2.3 2001/10/03 07:15:37 peter Exp $
48 * $DragonFly: src/sys/platform/pc64/include/pmap.h,v 1.1 2008/08/29 17:07:17 dillon Exp $
51 #ifndef _MACHINE_PMAP_H_
52 #define _MACHINE_PMAP_H_
57 * Size of Kernel address space. This is the number of page table pages
58 * (2MB each) to use for the kernel. 256 pages == 512 Megabyte.
59 * This **MUST** be a multiple of 4 (eg: 252, 256, 260, etc).
66 * Pte related macros. This is complicated by having to deal with
67 * the sign extension of the 48th bit.
69 #define KVADDR(l4, l3, l2, l1) ( \
70 ((unsigned long)-1 << 47) | \
71 ((unsigned long)(l4) << PML4SHIFT) | \
72 ((unsigned long)(l3) << PDPSHIFT) | \
73 ((unsigned long)(l2) << PDRSHIFT) | \
74 ((unsigned long)(l1) << PAGE_SHIFT))
76 #define UVADDR(l4, l3, l2, l1) ( \
77 ((unsigned long)(l4) << PML4SHIFT) | \
78 ((unsigned long)(l3) << PDPSHIFT) | \
79 ((unsigned long)(l2) << PDRSHIFT) | \
80 ((unsigned long)(l1) << PAGE_SHIFT))
82 /* Initial number of kernel page tables. */
87 #define NKPML4E 1 /* number of kernel PML4 slots */
88 #define NKPDPE howmany(NKPT, NPDEPG)/* number of kernel PDP slots */
90 #define NUPML4E (NPML4EPG/2) /* number of userland PML4 pages */
91 #define NUPDPE (NUPML4E*NPDPEPG)/* number of userland PDP pages */
92 #define NUPDE (NUPDPE*NPDEPG) /* number of userland PD entries */
94 #define NDMPML4E 1 /* number of dmap PML4 slots */
97 * The *PML4I values control the layout of virtual memory
99 #define PML4PML4I (NPML4EPG/2) /* Index of recursive pml4 mapping */
101 #define KPML4I (NPML4EPG-1) /* Top 512GB for KVM */
102 #define DMPML4I (KPML4I-1) /* Next 512GB down for direct map */
104 #define KPDPI (NPDPEPG-2) /* kernbase at -2GB */
106 /* per-CPU data is at -2MB */
107 /* XXX can the kernel decide to use this memory for something else? */
108 #define MPPML4I KPML4I
110 #define MPPTDI (NPDEPG-1)
113 * XXX doesn't really belong here I guess...
115 #define ISA_HOLE_START 0xa0000
116 #define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START)
120 #ifndef _SYS_TYPES_H_
121 #include <sys/types.h>
123 #ifndef _SYS_QUEUE_H_
124 #include <sys/queue.h>
126 #ifndef _MACHINE_TYPES_H_
127 #include <machine/types.h>
129 #ifndef _MACHINE_PARAM_H_
130 #include <machine/param.h>
134 * Address of current and alternate address space page table maps
138 #define addr_PTmap (KVADDR(PML4PML4I, 0, 0, 0))
139 #define addr_PDmap (KVADDR(PML4PML4I, PML4PML4I, 0, 0))
140 #define addr_PDPmap (KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, 0))
141 #define addr_PML4map (KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I))
142 #define addr_PML4pml4e (addr_PML4map + (PML4PML4I * sizeof(pml4_entry_t)))
143 #define PTmap ((pt_entry_t *)(addr_PTmap))
144 #define PDmap ((pd_entry_t *)(addr_PDmap))
145 #define PDPmap ((pd_entry_t *)(addr_PDPmap))
146 #define PML4map ((pd_entry_t *)(addr_PML4map))
147 #define PML4pml4e ((pd_entry_t *)(addr_PML4pml4e))
149 extern u_int64_t KPML4phys; /* physical address of kernel level 4 */
157 #define vtophys(va) pmap_kextract(((vm_offset_t)(va)))
158 #define vtophys_pte(va) ((pt_entry_t)pmap_kextract(((vm_offset_t)(va))))
162 #define pte_load_clear(pte) atomic_readandclear_long(pte)
165 pte_store(pt_entry_t *ptep, pt_entry_t pte)
171 #define pde_store(pdep, pde) pte_store((pdep), (pde))
182 TAILQ_HEAD(,pv_entry) pv_list;
186 * Each machine dependent implementation is expected to
187 * keep certain statistics. They may do this anyway they
188 * so choose, but are expected to return the statistics
189 * in the following structure.
191 * NOTE: We try to match the size of the pc32 pmap with the vkernel pmap
192 * so the same utilities (like 'ps') can be used on both.
194 struct pmap_statistics {
195 long resident_count; /* # of pages mapped (total) */
196 long wired_count; /* # of pages wired */
198 typedef struct pmap_statistics *pmap_statistics_t;
201 pml4_entry_t *pm_pml4; /* KVA of level 4 page table */
202 struct vm_page *pm_pdirm; /* VM page for pg directory */
203 struct vm_object *pm_pteobj; /* Container for pte's */
204 TAILQ_ENTRY(pmap) pm_pmnode; /* list of pmaps */
205 TAILQ_HEAD(,pv_entry) pm_pvlist; /* list of mappings in pmap */
206 int pm_count; /* reference count */
207 cpumask_t pm_active; /* active on cpus */
208 int pm_filler02; /* (filler sync w/vkernel) */
209 struct pmap_statistics pm_stats; /* pmap statistics */
210 struct vm_page *pm_ptphint; /* pmap ptp hint */
211 int pm_generation; /* detect pvlist deletions */
214 #define pmap_resident_count(pmap) (pmap)->pm_stats.resident_count
216 typedef struct pmap *pmap_t;
219 extern struct pmap kernel_pmap;
223 * For each vm_page_t, there is a list of all currently valid virtual
224 * mappings of that page. An entry is a pv_entry_t, the list is pv_table.
226 typedef struct pv_entry {
227 pmap_t pv_pmap; /* pmap where mapping lies */
228 vm_offset_t pv_va; /* virtual address for mapping */
229 TAILQ_ENTRY(pv_entry) pv_list;
230 TAILQ_ENTRY(pv_entry) pv_plist;
231 struct vm_page *pv_ptem; /* VM page for pte */
237 #define PPRO_VMTRRphysBase0 0x200
238 #define PPRO_VMTRRphysMask0 0x201
240 u_int64_t base, mask;
242 extern struct ppro_vmtrr PPro_vmtrr[NPPROVMTRR];
244 extern caddr_t CADDR1;
245 extern pt_entry_t *CMAP1;
246 extern vm_paddr_t avail_end;
247 extern vm_paddr_t avail_start;
248 extern vm_offset_t clean_eva;
249 extern vm_offset_t clean_sva;
250 extern char *ptvmmap; /* poor name! */
252 void init_paging(vm_paddr_t *);
253 void pmap_bootstrap ( vm_paddr_t *);
254 void *pmap_mapdev (vm_paddr_t, vm_size_t);
255 void *pmap_mapdev_uncacheable(vm_paddr_t, vm_size_t);
256 void pmap_unmapdev (vm_offset_t, vm_size_t);
258 pt_entry_t *pmap_pte (pmap_t, vm_offset_t) __pure2;
260 struct vm_page *pmap_use_pt (pmap_t, vm_offset_t);
262 void pmap_set_opt (void);
264 vm_paddr_t pmap_kextract(vm_offset_t);
270 #endif /* !_MACHINE_PMAP_H_ */