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 * from: src/sys/i386/include/pmap.h,v 1.65.2.2 2000/11/30 01:54:42 peter 42 * JNPR: pmap.h,v 1.7.2.1 2007/09/10 07:44:12 girish 43 * $FreeBSD: stable/9/sys/mips/include/pmap.h 240760 2012-09-20 18:21:29Z alc $ 44 */ 45 46 #ifndef _MACHINE_PMAP_H_ 47 #define _MACHINE_PMAP_H_ 48 49 #include <machine/vmparam.h> 50 #include <machine/pte.h> 51 52 #if defined(__mips_n32) || defined(__mips_n64) /* PHYSADDR_64BIT */ 53 #define NKPT 256 /* mem > 4G, vm_page_startup needs more KPTs */ 54 #else 55 #define NKPT 120 /* actual number of kernel page tables */ 56 #endif 57 58 #ifndef LOCORE 59 60 #include <sys/queue.h> 61 #include <sys/_cpuset.h> 62 #include <sys/_lock.h> 63 #include <sys/_mutex.h> 64 65 /* 66 * Pmap stuff 67 */ 68 struct pv_entry; 69 70 struct md_page { 71 int pv_list_count; 72 int pv_flags; 73 TAILQ_HEAD(, pv_entry) pv_list; 74 }; 75 76 #define PV_TABLE_MOD 0x01 /* modified */ 77 #define PV_TABLE_REF 0x02 /* referenced */ 78 79 #define ASID_BITS 8 80 #define ASIDGEN_BITS (32 - ASID_BITS) 81 #define ASIDGEN_MASK ((1 << ASIDGEN_BITS) - 1) 82 83 struct pmap { 84 pd_entry_t *pm_segtab; /* KVA of segment table */ 85 TAILQ_HEAD(, pv_entry) pm_pvlist; /* list of mappings in 86 * pmap */ 87 cpuset_t pm_active; /* active on cpus */ 88 struct { 89 u_int32_t asid:ASID_BITS; /* TLB address space tag */ 90 u_int32_t gen:ASIDGEN_BITS; /* its generation number */ 91 } pm_asid[MAXSMPCPU]; 92 struct pmap_statistics pm_stats; /* pmap statistics */ 93 struct vm_page *pm_ptphint; /* pmap ptp hint */ 94 struct mtx pm_mtx; 95 }; 96 97 typedef struct pmap *pmap_t; 98 99 #ifdef _KERNEL 100 101 pt_entry_t *pmap_pte(pmap_t, vm_offset_t); 102 vm_offset_t pmap_kextract(vm_offset_t va); 103 104 #define vtophys(va) pmap_kextract(((vm_offset_t) (va))) 105 #define pmap_asid(pmap) (pmap)->pm_asid[PCPU_GET(cpuid)].asid 106 107 extern struct pmap kernel_pmap_store; 108 #define kernel_pmap (&kernel_pmap_store) 109 110 #define PMAP_LOCK(pmap) mtx_lock(&(pmap)->pm_mtx) 111 #define PMAP_LOCK_ASSERT(pmap, type) mtx_assert(&(pmap)->pm_mtx, (type)) 112 #define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx) 113 #define PMAP_LOCK_INIT(pmap) mtx_init(&(pmap)->pm_mtx, "pmap", \ 114 NULL, MTX_DEF) 115 #define PMAP_LOCKED(pmap) mtx_owned(&(pmap)->pm_mtx) 116 #define PMAP_MTX(pmap) (&(pmap)->pm_mtx) 117 #define PMAP_TRYLOCK(pmap) mtx_trylock(&(pmap)->pm_mtx) 118 #define PMAP_UNLOCK(pmap) mtx_unlock(&(pmap)->pm_mtx) 119 120 /* 121 * For each vm_page_t, there is a list of all currently valid virtual 122 * mappings of that page. An entry is a pv_entry_t, the list is pv_table. 123 */ 124 typedef struct pv_entry { 125 pmap_t pv_pmap; /* pmap where mapping lies */ 126 vm_offset_t pv_va; /* virtual address for mapping */ 127 TAILQ_ENTRY(pv_entry) pv_list; 128 TAILQ_ENTRY(pv_entry) pv_plist; 129 vm_page_t pv_ptem; /* VM page for pte */ 130 } *pv_entry_t; 131 132 /* 133 * physmem_desc[] is a superset of phys_avail[] and describes all the 134 * memory present in the system. 135 * 136 * phys_avail[] is similar but does not include the memory stolen by 137 * pmap_steal_memory(). 138 * 139 * Each memory region is described by a pair of elements in the array 140 * so we can describe up to (PHYS_AVAIL_ENTRIES / 2) distinct memory 141 * regions. 142 */ 143 #define PHYS_AVAIL_ENTRIES 10 144 extern vm_paddr_t phys_avail[PHYS_AVAIL_ENTRIES + 2]; 145 extern vm_paddr_t physmem_desc[PHYS_AVAIL_ENTRIES + 2]; 146 147 extern vm_offset_t virtual_avail; 148 extern vm_offset_t virtual_end; 149 150 extern vm_paddr_t dump_avail[PHYS_AVAIL_ENTRIES + 2]; 151 152 #define pmap_page_get_memattr(m) VM_MEMATTR_DEFAULT 153 #define pmap_page_is_mapped(m) (!TAILQ_EMPTY(&(m)->md.pv_list)) 154 #define pmap_page_is_write_mapped(m) (((m)->aflags & PGA_WRITEABLE) != 0) 155 #define pmap_page_set_memattr(m, ma) (void)0 156 157 void pmap_bootstrap(void); 158 void *pmap_mapdev(vm_paddr_t, vm_size_t); 159 void pmap_unmapdev(vm_offset_t, vm_size_t); 160 vm_offset_t pmap_steal_memory(vm_size_t size); 161 int page_is_managed(vm_paddr_t pa); 162 void pmap_kenter(vm_offset_t va, vm_paddr_t pa); 163 void pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, int attr); 164 void pmap_kremove(vm_offset_t va); 165 void *pmap_kenter_temporary(vm_paddr_t pa, int i); 166 void pmap_kenter_temporary_free(vm_paddr_t pa); 167 int pmap_compute_pages_to_dump(void); 168 void pmap_flush_pvcache(vm_page_t m); 169 int pmap_emulate_modified(pmap_t pmap, vm_offset_t va); 170 void pmap_grow_direct_page_cache(void); 171 vm_page_t pmap_alloc_direct_page(unsigned int index, int req); 172 173 #endif /* _KERNEL */ 174 175 #endif /* !LOCORE */ 176 177 #endif /* !_MACHINE_PMAP_H_ */ 178