2 * Copyright (c) 1991 Regents of the University of California.
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.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
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.
39 * from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
40 * from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
44 #ifndef _MACHINE_PMAP_H_
45 #define _MACHINE_PMAP_H_
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.
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 */
67 #define PG_NX (1ull<<63) /* No-execute */
71 /* Our various interpretations of the above */
72 #define PG_W PG_AVAIL1 /* "Wired" pseudoflag */
73 #define PG_MANAGED PG_AVAIL2
75 #define PG_FRAME (0x000ffffffffff000ull)
76 #define PG_PS_FRAME (0x000fffffffe00000ull)
78 #define PG_FRAME (~PAGE_MASK)
79 #define PG_PS_FRAME (0xffc00000)
81 #define PG_PROT (PG_RW|PG_U) /* all protection bits . */
82 #define PG_N (PG_NC_PWT|PG_NC_PCD) /* Non-cacheable */
85 * Promotion to a 2 or 4MB (PDE) page mapping requires that the corresponding
86 * 4KB (PTE) page mappings have identical settings for the following fields:
88 #define PG_PTE_PROMOTE (PG_MANAGED | PG_W | PG_G | PG_PTE_PAT | \
89 PG_M | PG_A | PG_NC_PCD | PG_NC_PWT | PG_U | PG_RW | PG_V)
92 * Page Protection Exception bits
95 #define PGEX_P 0x01 /* Protection violation vs. not present */
96 #define PGEX_W 0x02 /* during a Write cycle */
97 #define PGEX_U 0x04 /* access from User mode (UPL) */
98 #define PGEX_RSV 0x08 /* reserved PTE field is non-zero */
99 #define PGEX_I 0x10 /* during an instruction fetch */
102 * Size of Kernel address space. This is the number of page table pages
103 * (4MB each) to use for the kernel. 256 pages == 1 Gigabyte.
104 * This **MUST** be a multiple of 4 (eg: 252, 256, 260, etc).
105 * For PAE, the page table page unit size is 2MB. This means that 512 pages
106 * is 1 Gigabyte. Double everything. It must be a multiple of 8 for PAE.
110 #define KVA_PAGES 512
112 #define KVA_PAGES 256
119 #define VADDR(pdi, pti) ((vm_offset_t)(((pdi)<<PDRSHIFT)|((pti)<<PAGE_SHIFT)))
121 /* Initial number of kernel page tables. */
124 /* 152 page tables needed to map 16G (76B "struct vm_page", 2M page tables). */
127 /* 18 page tables needed to map 4G (72B "struct vm_page", 4M page tables). */
133 #define NKPDE (KVA_PAGES) /* number of page tables/pde's */
137 * The *PTDI values control the layout of virtual memory
139 * XXX This works for now, but I am not real happy with it, I'll fix it
140 * right after I fix locore.s and the magic 28K hole
142 #define KPTDI (NPDEPTD-NKPDE) /* start of kernel virtual pde's */
143 #define PTDPTDI (KPTDI-NPGPTD) /* ptd entry that points to ptd! */
146 * XXX doesn't really belong here I guess...
148 #define ISA_HOLE_START 0xa0000
149 #define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START)
153 #include <sys/queue.h>
154 #include <sys/_lock.h>
155 #include <sys/_mutex.h>
159 typedef uint64_t pdpt_entry_t;
160 typedef uint64_t pd_entry_t;
161 typedef uint64_t pt_entry_t;
168 typedef uint32_t pd_entry_t;
169 typedef uint32_t pt_entry_t;
177 * Address of current and alternate address space page table maps
181 extern pt_entry_t PTmap[];
182 extern pd_entry_t PTD[];
183 extern pd_entry_t PTDpde[];
186 extern pdpt_entry_t *IdlePDPT;
188 extern pd_entry_t *IdlePTD; /* physical address of "Idle" state directory */
193 * virtual address to page table entry and
194 * to physical address.
195 * Note: these work recursively, thus vtopte of a pte will give
196 * the corresponding pde that in turn maps it.
198 #define vtopte(va) (PTmap + i386_btop(va))
199 #define vtophys(va) pmap_kextract((vm_offset_t)(va))
202 #include <sys/param.h>
203 #include <machine/xen/xen-os.h>
204 #include <machine/xen/xenvar.h>
205 #include <machine/xen/xenpmap.h>
207 extern pt_entry_t pg_nx;
209 #define PG_KERNEL (PG_V | PG_A | PG_RW | PG_M)
211 #define MACH_TO_VM_PAGE(ma) PHYS_TO_VM_PAGE(xpmap_mtop((ma)))
212 #define VM_PAGE_TO_MACH(m) xpmap_ptom(VM_PAGE_TO_PHYS((m)))
214 static __inline vm_paddr_t
215 pmap_kextract_ma(vm_offset_t va)
218 if ((ma = PTD[va >> PDRSHIFT]) & PG_PS) {
219 ma = (ma & ~(NBPDR - 1)) | (va & (NBPDR - 1));
221 ma = (*vtopte(va) & PG_FRAME) | (va & PAGE_MASK);
226 static __inline vm_paddr_t
227 pmap_kextract(vm_offset_t va)
229 return xpmap_mtop(pmap_kextract_ma(va));
231 #define vtomach(va) pmap_kextract_ma(((vm_offset_t) (va)))
233 vm_paddr_t pmap_extract_ma(struct pmap *pmap, vm_offset_t va);
235 void pmap_kenter_ma(vm_offset_t va, vm_paddr_t pa);
236 void pmap_map_readonly(struct pmap *pmap, vm_offset_t va, int len);
237 void pmap_map_readwrite(struct pmap *pmap, vm_offset_t va, int len);
239 static __inline pt_entry_t
240 pte_load_store(pt_entry_t *ptep, pt_entry_t v)
246 PT_SET_VA(ptep, v, TRUE);
250 static __inline pt_entry_t
251 pte_load_store_ma(pt_entry_t *ptep, pt_entry_t v)
256 PT_SET_VA_MA(ptep, v, TRUE);
260 #define pte_load_clear(ptep) pte_load_store((ptep), (pt_entry_t)0ULL)
262 #define pte_store(ptep, pte) pte_load_store((ptep), (pt_entry_t)pte)
263 #define pte_store_ma(ptep, pte) pte_load_store_ma((ptep), (pt_entry_t)pte)
264 #define pde_store_ma(ptep, pte) pte_load_store_ma((ptep), (pt_entry_t)pte)
268 * Routine: pmap_kextract
270 * Extract the physical page address associated
271 * kernel virtual address.
273 static __inline vm_paddr_t
274 pmap_kextract(vm_offset_t va)
278 if ((pa = PTD[va >> PDRSHIFT]) & PG_PS) {
279 pa = (pa & PG_PS_FRAME) | (va & PDRMASK);
282 pa = (pa & PG_FRAME) | (va & PAGE_MASK);
287 #define PT_UPDATES_FLUSH()
290 #if defined(PAE) && !defined(XEN)
292 #define pde_cmpset(pdep, old, new) \
293 atomic_cmpset_64((pdep), (old), (new))
295 static __inline pt_entry_t
296 pte_load(pt_entry_t *ptep)
303 : "m" (*ptep), "a" (0), "d" (0), "b" (0), "c" (0));
307 static __inline pt_entry_t
308 pte_load_store(pt_entry_t *ptep, pt_entry_t v)
315 "\tlock; cmpxchg8b %1\n"
318 : "m" (*ptep), "b" ((uint32_t)v), "c" ((uint32_t)(v >> 32)));
322 /* XXXRU move to atomic.h? */
324 atomic_cmpset_64(volatile uint64_t *dst, uint64_t exp, uint64_t src)
334 : "+A" (res), /* 0 (result) */
336 : "m" (*dst), /* 2 */
338 "c" ((uint32_t)(src >> 32)));
343 #define pte_load_clear(ptep) pte_load_store((ptep), (pt_entry_t)0ULL)
345 #define pte_store(ptep, pte) pte_load_store((ptep), (pt_entry_t)pte)
347 extern pt_entry_t pg_nx;
349 #elif !defined(PAE) && !defined (XEN)
351 #define pde_cmpset(pdep, old, new) \
352 atomic_cmpset_int((pdep), (old), (new))
354 static __inline pt_entry_t
355 pte_load(pt_entry_t *ptep)
363 static __inline pt_entry_t
364 pte_load_store(pt_entry_t *ptep, pt_entry_t pte)
377 #define pte_load_clear(pte) atomic_readandclear_int(pte)
380 pte_store(pt_entry_t *ptep, pt_entry_t pte)
388 #define pte_clear(ptep) pte_store((ptep), (pt_entry_t)0ULL)
390 #define pde_store(pdep, pde) pte_store((pdep), (pde))
401 TAILQ_HEAD(,pv_entry) pv_list;
406 pd_entry_t *pm_pdir; /* KVA of page directory */
407 TAILQ_HEAD(,pv_chunk) pm_pvchunk; /* list of mappings in pmap */
408 u_int pm_active; /* active on cpus */
409 struct pmap_statistics pm_stats; /* pmap statistics */
410 LIST_ENTRY(pmap) pm_list; /* List of all pmaps */
412 pdpt_entry_t *pm_pdpt; /* KVA of page director pointer
415 vm_page_t pm_root; /* spare page table pages */
418 typedef struct pmap *pmap_t;
421 extern struct pmap kernel_pmap_store;
422 #define kernel_pmap (&kernel_pmap_store)
424 #define PMAP_LOCK(pmap) mtx_lock(&(pmap)->pm_mtx)
425 #define PMAP_LOCK_ASSERT(pmap, type) \
426 mtx_assert(&(pmap)->pm_mtx, (type))
427 #define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx)
428 #define PMAP_LOCK_INIT(pmap) mtx_init(&(pmap)->pm_mtx, "pmap", \
429 NULL, MTX_DEF | MTX_DUPOK)
430 #define PMAP_LOCKED(pmap) mtx_owned(&(pmap)->pm_mtx)
431 #define PMAP_MTX(pmap) (&(pmap)->pm_mtx)
432 #define PMAP_TRYLOCK(pmap) mtx_trylock(&(pmap)->pm_mtx)
433 #define PMAP_UNLOCK(pmap) mtx_unlock(&(pmap)->pm_mtx)
437 * For each vm_page_t, there is a list of all currently valid virtual
438 * mappings of that page. An entry is a pv_entry_t, the list is pv_list.
440 typedef struct pv_entry {
441 vm_offset_t pv_va; /* virtual address for mapping */
442 TAILQ_ENTRY(pv_entry) pv_list;
446 * pv_entries are allocated in chunks per-process. This avoids the
447 * need to track per-pmap assignments.
453 TAILQ_ENTRY(pv_chunk) pc_list;
454 uint32_t pc_map[_NPCM]; /* bitmap; 1 = free */
455 uint32_t pc_spare[2];
456 struct pv_entry pc_pventry[_NPCPV];
462 #define PPRO_VMTRRphysBase0 0x200
463 #define PPRO_VMTRRphysMask0 0x201
465 u_int64_t base, mask;
467 extern struct ppro_vmtrr PPro_vmtrr[NPPROVMTRR];
469 extern caddr_t CADDR1;
470 extern pt_entry_t *CMAP1;
471 extern vm_paddr_t phys_avail[];
472 extern vm_paddr_t dump_avail[];
475 extern char *ptvmmap; /* poor name! */
476 extern vm_offset_t virtual_avail;
477 extern vm_offset_t virtual_end;
479 #define pmap_unmapbios(va, sz) pmap_unmapdev((va), (sz))
481 void pmap_bootstrap(vm_paddr_t);
482 int pmap_change_attr(vm_offset_t, vm_size_t, int);
483 void pmap_init_pat(void);
484 void pmap_kenter(vm_offset_t va, vm_paddr_t pa);
485 void *pmap_kenter_temporary(vm_paddr_t pa, int i);
486 void pmap_kremove(vm_offset_t);
487 void *pmap_mapbios(vm_paddr_t, vm_size_t);
488 void *pmap_mapdev(vm_paddr_t, vm_size_t);
489 void *pmap_mapdev_attr(vm_paddr_t, vm_size_t, int);
490 boolean_t pmap_page_is_mapped(vm_page_t m);
491 void pmap_unmapdev(vm_offset_t, vm_size_t);
492 pt_entry_t *pmap_pte(pmap_t, vm_offset_t) __pure2;
493 void pmap_set_pg(void);
494 void pmap_invalidate_page(pmap_t, vm_offset_t);
495 void pmap_invalidate_range(pmap_t, vm_offset_t, vm_offset_t);
496 void pmap_invalidate_all(pmap_t);
497 void pmap_invalidate_cache(void);
503 #endif /* !_MACHINE_PMAP_H_ */