pmap.h (7205B) - Raw
1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2014,2016 Svatopluk Kraus <onwahe@gmail.com> 5 * Copyright (c) 2014,2016 Michal Meloun <meloun@miracle.cz> 6 * Copyright (c) 1991 Regents of the University of California. 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * the Systems Programming Group of the University of Utah Computer 11 * Science Department and William Jolitz of UUNET Technologies Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 * The ARM version of this file was more or less based on the i386 version, 35 * which has the following provenance... 36 * 37 * Derived from hp300 version by Mike Hibler, this version by William 38 * Jolitz uses a recursive map [a pde points to the page directory] to 39 * map the page tables using the pagetables themselves. This is done to 40 * reduce the impact on kernel virtual memory for lots of sparse address 41 * space, and to reduce the cost of memory to each process. 42 * 43 * from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90 44 * from: @(#)pmap.h 7.4 (Berkeley) 5/12/91 45 * from: FreeBSD: src/sys/i386/include/pmap.h,v 1.70 2000/11/30 46 */ 47 48 #ifndef _MACHINE_PMAP_H_ 49 #define _MACHINE_PMAP_H_ 50 51 #include <sys/systm.h> 52 #include <sys/queue.h> 53 #include <sys/_cpuset.h> 54 #include <sys/_lock.h> 55 #include <sys/_mutex.h> 56 #include <sys/_pv_entry.h> 57 58 typedef uint32_t pt1_entry_t; /* L1 table entry */ 59 typedef uint32_t pt2_entry_t; /* L2 table entry */ 60 typedef uint32_t ttb_entry_t; /* TTB entry */ 61 62 #ifdef _KERNEL 63 64 #if 0 65 #define PMAP_PTE_NOCACHE // Use uncached page tables 66 #endif 67 68 /* 69 * (1) During pmap bootstrap, physical pages for L2 page tables are 70 * allocated in advance which are used for KVA continuous mapping 71 * starting from KERNBASE. This makes things more simple. 72 * (2) During vm subsystem initialization, only vm subsystem itself can 73 * allocate physical memory safely. As pmap_map() is called during 74 * this initialization, we must be prepared for that and have some 75 * preallocated physical pages for L2 page tables. 76 * 77 * Note that some more pages for L2 page tables are preallocated too 78 * for mappings laying above VM_MAX_KERNEL_ADDRESS. 79 */ 80 #ifndef NKPT2PG 81 /* 82 * The optimal way is to define this in board configuration as 83 * definition here must be safe enough. It means really big. 84 * 85 * 1 GB KVA <=> 256 kernel L2 page table pages 86 * 87 * From real platforms: 88 * 1 GB physical memory <=> 10 pages is enough 89 * 2 GB physical memory <=> 21 pages is enough 90 */ 91 #define NKPT2PG 32 92 #endif 93 #endif /* _KERNEL */ 94 95 /* 96 * Pmap stuff 97 */ 98 struct md_page { 99 TAILQ_HEAD(,pv_entry) pv_list; 100 uint16_t pt2_wirecount[4]; 101 vm_memattr_t pat_mode; 102 }; 103 104 struct pmap { 105 struct mtx pm_mtx; 106 pt1_entry_t *pm_pt1; /* KVA of pt1 */ 107 pt2_entry_t *pm_pt2tab; /* KVA of pt2 pages table */ 108 TAILQ_HEAD(,pv_chunk) pm_pvchunk; /* list of mappings in pmap */ 109 cpuset_t pm_active; /* active on cpus */ 110 struct pmap_statistics pm_stats; /* pmap statictics */ 111 LIST_ENTRY(pmap) pm_list; /* List of all pmaps */ 112 }; 113 114 typedef struct pmap *pmap_t; 115 116 #ifdef _KERNEL 117 extern struct pmap kernel_pmap_store; 118 #define kernel_pmap (&kernel_pmap_store) 119 120 #define PMAP_LOCK(pmap) mtx_lock(&(pmap)->pm_mtx) 121 #define PMAP_LOCK_ASSERT(pmap, type) \ 122 mtx_assert(&(pmap)->pm_mtx, (type)) 123 #define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx) 124 #define PMAP_LOCK_INIT(pmap) mtx_init(&(pmap)->pm_mtx, "pmap", \ 125 NULL, MTX_DEF | MTX_DUPOK) 126 #define PMAP_LOCKED(pmap) mtx_owned(&(pmap)->pm_mtx) 127 #define PMAP_MTX(pmap) (&(pmap)->pm_mtx) 128 #define PMAP_TRYLOCK(pmap) mtx_trylock(&(pmap)->pm_mtx) 129 #define PMAP_UNLOCK(pmap) mtx_unlock(&(pmap)->pm_mtx) 130 131 extern ttb_entry_t pmap_kern_ttb; /* TTB for kernel pmap */ 132 133 #define pmap_page_get_memattr(m) ((m)->md.pat_mode) 134 135 /* 136 * Only the following functions or macros may be used before pmap_bootstrap() 137 * is called: pmap_kenter(), pmap_kextract(), pmap_kremove(), vtophys(), and 138 * vtopte2(). 139 */ 140 void pmap_bootstrap(vm_offset_t); 141 void pmap_kenter(vm_offset_t, vm_paddr_t); 142 void pmap_kremove(vm_offset_t); 143 boolean_t pmap_page_is_mapped(vm_page_t); 144 bool pmap_ps_enabled(pmap_t pmap); 145 146 void pmap_tlb_flush(pmap_t, vm_offset_t); 147 void pmap_tlb_flush_range(pmap_t, vm_offset_t, vm_size_t); 148 149 vm_paddr_t pmap_dump_kextract(vm_offset_t, pt2_entry_t *); 150 151 int pmap_fault(pmap_t, vm_offset_t, uint32_t, int, bool); 152 153 void pmap_set_tex(void); 154 155 /* 156 * Pre-bootstrap epoch functions set. 157 */ 158 void pmap_bootstrap_prepare(vm_paddr_t); 159 vm_paddr_t pmap_preboot_get_pages(u_int); 160 void pmap_preboot_map_pages(vm_paddr_t, vm_offset_t, u_int); 161 vm_offset_t pmap_preboot_reserve_pages(u_int); 162 vm_offset_t pmap_preboot_get_vpages(u_int); 163 void pmap_preboot_map_attr(vm_paddr_t, vm_offset_t, vm_size_t, vm_prot_t, 164 vm_memattr_t); 165 void pmap_remap_vm_attr(vm_memattr_t old_attr, vm_memattr_t new_attr); 166 167 extern char *_tmppt; /* poor name! */ 168 169 extern vm_offset_t virtual_avail; 170 extern vm_offset_t virtual_end; 171 172 void *pmap_kenter_temporary(vm_paddr_t, int); 173 #define pmap_page_is_write_mapped(m) (((m)->a.flags & PGA_WRITEABLE) != 0) 174 void pmap_page_set_memattr(vm_page_t, vm_memattr_t); 175 #define pmap_map_delete(pmap, sva, eva) pmap_remove(pmap, sva, eva) 176 177 void *pmap_mapdev(vm_paddr_t, vm_size_t); 178 void pmap_unmapdev(void *, vm_size_t); 179 180 static inline void * 181 pmap_mapdev_attr(vm_paddr_t addr __unused, vm_size_t size __unused, 182 int attr __unused) 183 { 184 panic("%s is not implemented yet!\n", __func__); 185 } 186 187 struct pcb; 188 void pmap_set_pcb_pagedir(pmap_t, struct pcb *); 189 190 void pmap_kenter_device(vm_offset_t, vm_size_t, vm_paddr_t); 191 void pmap_kremove_device(vm_offset_t, vm_size_t); 192 193 vm_paddr_t pmap_kextract(vm_offset_t); 194 #define vtophys(va) pmap_kextract((vm_offset_t)(va)) 195 196 static inline int 197 pmap_vmspace_copy(pmap_t dst_pmap __unused, pmap_t src_pmap __unused) 198 { 199 200 return (0); 201 } 202 203 #define PMAP_ENTER_QUICK_LOCKED 0x10000000 204 205 #define pmap_vm_page_alloc_check(m) 206 207 #endif /* _KERNEL */ 208 #endif /* !_MACHINE_PMAP_H_ */