1 /*- 2 * Copyright 2014 Svatopluk Kraus <[email protected]> 3 * Copyright 2014 Michal Meloun <[email protected]> 4 * Copyright (c) 1991 Regents of the University of California. 5 * All rights reserved. 6 * 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. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * The ARM version of this file was more or less based on the i386 version, 33 * which has the following provenance... 34 * 35 * Derived from hp300 version by Mike Hibler, this version by William 36 * Jolitz uses a recursive map [a pde points to the page directory] to 37 * map the page tables using the pagetables themselves. This is done to 38 * reduce the impact on kernel virtual memory for lots of sparse address 39 * space, and to reduce the cost of memory to each process. 40 * 41 * from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90 42 * from: @(#)pmap.h 7.4 (Berkeley) 5/12/91 43 * from: FreeBSD: src/sys/i386/include/pmap.h,v 1.70 2000/11/30 44 * 45 * $FreeBSD$ 46 */ 47 48 #ifndef _MACHINE_PMAP_V6_H_ 49 #define _MACHINE_PMAP_V6_H_ 50 51 #include <sys/queue.h> 52 #include <sys/_cpuset.h> 53 #include <sys/_lock.h> 54 #include <sys/_mutex.h> 55 56 typedef uint32_t pt1_entry_t; /* L1 table entry */ 57 typedef uint32_t pt2_entry_t; /* L2 table entry */ 58 typedef uint32_t ttb_entry_t; /* TTB entry */ 59 60 #ifdef _KERNEL 61 62 #if 0 63 #define PMAP_PTE_NOCACHE // Use uncached page tables 64 #endif 65 66 /* 67 * (1) During pmap bootstrap, physical pages for L2 page tables are 68 * allocated in advance which are used for KVA continuous mapping 69 * starting from KERNBASE. This makes things more simple. 70 * (2) During vm subsystem initialization, only vm subsystem itself can 71 * allocate physical memory safely. As pmap_map() is called during 72 * this initialization, we must be prepared for that and have some 73 * preallocated physical pages for L2 page tables. 74 * 75 * Note that some more pages for L2 page tables are preallocated too 76 * for mappings laying above VM_MAX_KERNEL_ADDRESS. 77 */ 78 #ifndef NKPT2PG 79 /* 80 * The optimal way is to define this in board configuration as 81 * definition here must be safe enough. It means really big. 82 * 83 * 1 GB KVA <=> 256 kernel L2 page table pages 84 * 85 * From real platforms: 86 * 1 GB physical memory <=> 10 pages is enough 87 * 2 GB physical memory <=> 21 pages is enough 88 */ 89 #define NKPT2PG 32 90 #endif 91 #endif /* _KERNEL */ 92 93 /* 94 * Pmap stuff 95 */ 96 struct pv_entry; 97 struct pv_chunk; 98 99 struct md_page { 100 TAILQ_HEAD(,pv_entry) pv_list; 101 uint16_t pt2_wirecount[4]; 102 vm_memattr_t pat_mode; 103 }; 104 105 struct pmap { 106 struct mtx pm_mtx; 107 pt1_entry_t *pm_pt1; /* KVA of pt1 */ 108 pt2_entry_t *pm_pt2tab; /* KVA of pt2 pages table */ 109 TAILQ_HEAD(,pv_chunk) pm_pvchunk; /* list of mappings in pmap */ 110 cpuset_t pm_active; /* active on cpus */ 111 struct pmap_statistics pm_stats; /* pmap statictics */ 112 LIST_ENTRY(pmap) pm_list; /* List of all pmaps */ 113 }; 114 115 typedef struct pmap *pmap_t; 116 117 #ifdef _KERNEL 118 extern struct pmap kernel_pmap_store; 119 #define kernel_pmap (&kernel_pmap_store) 120 121 #define PMAP_LOCK(pmap) mtx_lock(&(pmap)->pm_mtx) 122 #define PMAP_LOCK_ASSERT(pmap, type) \ 123 mtx_assert(&(pmap)->pm_mtx, (type)) 124 #define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx) 125 #define PMAP_LOCK_INIT(pmap) mtx_init(&(pmap)->pm_mtx, "pmap", \ 126 NULL, MTX_DEF | MTX_DUPOK) 127 #define PMAP_LOCKED(pmap) mtx_owned(&(pmap)->pm_mtx) 128 #define PMAP_MTX(pmap) (&(pmap)->pm_mtx) 129 #define PMAP_TRYLOCK(pmap) mtx_trylock(&(pmap)->pm_mtx) 130 #define PMAP_UNLOCK(pmap) mtx_unlock(&(pmap)->pm_mtx) 131 #endif 132 133 /* 134 * For each vm_page_t, there is a list of all currently valid virtual 135 * mappings of that page. An entry is a pv_entry_t, the list is pv_list. 136 */ 137 typedef struct pv_entry { 138 vm_offset_t pv_va; /* virtual address for mapping */ 139 TAILQ_ENTRY(pv_entry) pv_next; 140 } *pv_entry_t; 141 142 /* 143 * pv_entries are allocated in chunks per-process. This avoids the 144 * need to track per-pmap assignments. 145 */ 146 #define _NPCM 11 147 #define _NPCPV 336 148 struct pv_chunk { 149 pmap_t pc_pmap; 150 TAILQ_ENTRY(pv_chunk) pc_list; 151 uint32_t pc_map[_NPCM]; /* bitmap; 1 = free */ 152 TAILQ_ENTRY(pv_chunk) pc_lru; 153 struct pv_entry pc_pventry[_NPCPV]; 154 }; 155 156 #ifdef _KERNEL 157 extern ttb_entry_t pmap_kern_ttb; /* TTB for kernel pmap */ 158 159 #define pmap_page_get_memattr(m) ((m)->md.pat_mode) 160 161 /* 162 * Only the following functions or macros may be used before pmap_bootstrap() 163 * is called: pmap_kenter(), pmap_kextract(), pmap_kremove(), vtophys(), and 164 * vtopte2(). 165 */ 166 void pmap_bootstrap(vm_offset_t); 167 void pmap_kenter(vm_offset_t, vm_paddr_t); 168 void pmap_kremove(vm_offset_t); 169 boolean_t pmap_page_is_mapped(vm_page_t); 170 bool pmap_ps_enabled(pmap_t pmap); 171 172 void pmap_tlb_flush(pmap_t, vm_offset_t); 173 void pmap_tlb_flush_range(pmap_t, vm_offset_t, vm_size_t); 174 175 vm_paddr_t pmap_dump_kextract(vm_offset_t, pt2_entry_t *); 176 177 int pmap_fault(pmap_t, vm_offset_t, uint32_t, int, bool); 178 179 void pmap_set_tex(void); 180 181 /* 182 * Pre-bootstrap epoch functions set. 183 */ 184 void pmap_bootstrap_prepare(vm_paddr_t); 185 vm_paddr_t pmap_preboot_get_pages(u_int); 186 void pmap_preboot_map_pages(vm_paddr_t, vm_offset_t, u_int); 187 vm_offset_t pmap_preboot_reserve_pages(u_int); 188 vm_offset_t pmap_preboot_get_vpages(u_int); 189 void pmap_preboot_map_attr(vm_paddr_t, vm_offset_t, vm_size_t, vm_prot_t, 190 vm_memattr_t); 191 void pmap_remap_vm_attr(vm_memattr_t old_attr, vm_memattr_t new_attr); 192 193 #endif /* _KERNEL */ 194 #endif /* !_MACHINE_PMAP_V6_H_ */ 195