1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 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 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 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 * $FreeBSD$ 44 */ 45 46 #ifndef _MACHINE_PMAP_H_ 47 #define _MACHINE_PMAP_H_ 48 49 /* 50 * Page-directory and page-table entries follow this format, with a few 51 * of the fields not present here and there, depending on a lot of things. 52 */ 53 /* ---- Intel Nomenclature ---- */ 54 #define PG_V 0x001 /* P Valid */ 55 #define PG_RW 0x002 /* R/W Read/Write */ 56 #define PG_U 0x004 /* U/S User/Supervisor */ 57 #define PG_NC_PWT 0x008 /* PWT Write through */ 58 #define PG_NC_PCD 0x010 /* PCD Cache disable */ 59 #define PG_A 0x020 /* A Accessed */ 60 #define PG_M 0x040 /* D Dirty */ 61 #define PG_PS 0x080 /* PS Page size (0=4k,1=4M) */ 62 #define PG_PTE_PAT 0x080 /* PAT PAT index */ 63 #define PG_G 0x100 /* G Global */ 64 #define PG_AVAIL1 0x200 /* / Available for system */ 65 #define PG_AVAIL2 0x400 /* < programmers use */ 66 #define PG_AVAIL3 0x800 /* \ */ 67 #define PG_PDE_PAT 0x1000 /* PAT PAT index */ 68 #define PG_NX (1ull<<63) /* No-execute */ 69 70 71 /* Our various interpretations of the above */ 72 #define PG_W PG_AVAIL1 /* "Wired" pseudoflag */ 73 #define PG_MANAGED PG_AVAIL2 74 #define PG_PROMOTED PG_AVAIL3 /* PDE only */ 75 76 #define PG_PROT (PG_RW|PG_U) /* all protection bits . */ 77 #define PG_N (PG_NC_PWT|PG_NC_PCD) /* Non-cacheable */ 78 79 /* Page level cache control fields used to determine the PAT type */ 80 #define PG_PDE_CACHE (PG_PDE_PAT | PG_NC_PWT | PG_NC_PCD) 81 #define PG_PTE_CACHE (PG_PTE_PAT | PG_NC_PWT | PG_NC_PCD) 82 83 /* 84 * Promotion to a 2 or 4MB (PDE) page mapping requires that the corresponding 85 * 4KB (PTE) page mappings have identical settings for the following fields: 86 */ 87 #define PG_PTE_PROMOTE (PG_MANAGED | PG_W | PG_G | PG_PTE_PAT | \ 88 PG_M | PG_A | PG_NC_PCD | PG_NC_PWT | PG_U | PG_RW | PG_V) 89 90 /* 91 * Page Protection Exception bits 92 */ 93 94 #define PGEX_P 0x01 /* Protection violation vs. not present */ 95 #define PGEX_W 0x02 /* during a Write cycle */ 96 #define PGEX_U 0x04 /* access from User mode (UPL) */ 97 #define PGEX_RSV 0x08 /* reserved PTE field is non-zero */ 98 #define PGEX_I 0x10 /* during an instruction fetch */ 99 100 /* 101 * Pte related macros 102 */ 103 #define VADDR(pdi, pti) ((vm_offset_t)(((pdi)<<PDRSHIFT)|((pti)<<PAGE_SHIFT))) 104 105 #ifndef NKPDE 106 #define NKPDE (KVA_PAGES) /* number of page tables/pde's */ 107 #endif 108 109 #define PDRSHIFT_PAE 21 /* LOG2(NBPDR) */ 110 #define PG_FRAME_PAE (0x000ffffffffff000ull) 111 #define PG_PS_FRAME_PAE (0x000fffffffe00000ull) 112 113 #define PDRSHIFT_NOPAE 22 114 #define PG_FRAME_NOPAE (~PAGE_MASK) 115 #define PG_PS_FRAME_NOPAE (0xffc00000) 116 117 /* 118 * The *PTDI values control the layout of virtual memory 119 */ 120 #define KPTDI 0 /* start of kernel virtual pde's */ 121 /* ptd entry that points to ptd */ 122 #define PTDPTDI (NPDEPTD - NTRPPTD - NPGPTD) 123 #define TRPTDI (NPDEPTD - NTRPPTD) /* u/k trampoline ptd */ 124 125 /* 126 * XXX doesn't really belong here I guess... 127 */ 128 #define ISA_HOLE_START 0xa0000 129 #define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START) 130 131 #ifndef LOCORE 132 133 #include <sys/queue.h> 134 #include <sys/_cpuset.h> 135 #include <sys/_lock.h> 136 #include <sys/_mutex.h> 137 138 #include <vm/_vm_radix.h> 139 140 /* 141 * Address of current address space page table maps and directories. 142 */ 143 #ifdef _KERNEL 144 145 /* 146 * Translate a virtual address to its physical address. 147 * 148 * This macro may be used before pmap_bootstrap() is called. 149 */ 150 #define vtophys(va) pmap_kextract((vm_offset_t)(va)) 151 152 #define pte_clear(ptep) pte_store(ptep, 0) 153 154 #define pde_store(pdep, pde) pte_store(pdep, pde) 155 156 #endif /* _KERNEL */ 157 158 /* 159 * Pmap stuff 160 */ 161 struct pv_entry; 162 struct pv_chunk; 163 164 struct md_page { 165 TAILQ_HEAD(,pv_entry) pv_list; 166 int pat_mode; 167 }; 168 169 struct pmap { 170 cpuset_t pm_active; /* active on cpus */ 171 struct mtx pm_mtx; 172 struct pmap_statistics pm_stats; /* pmap statistics */ 173 uint32_t *pm_pdir_nopae; /* KVA of page directory */ 174 uint64_t *pm_pdir_pae; 175 TAILQ_HEAD(,pv_chunk) pm_pvchunk; /* list of mappings in pmap */ 176 LIST_ENTRY(pmap) pm_list; /* List of all pmaps */ 177 uint64_t *pm_pdpt_pae; 178 struct vm_radix pm_root; /* spare page table pages */ 179 vm_page_t pm_ptdpg[4]; /* PAE NPGPTD */ 180 }; 181 182 typedef struct pmap *pmap_t; 183 184 #ifdef _KERNEL 185 extern struct pmap kernel_pmap_store; 186 #define kernel_pmap (&kernel_pmap_store) 187 188 #define PMAP_LOCK(pmap) mtx_lock(&(pmap)->pm_mtx) 189 #define PMAP_LOCK_ASSERT(pmap, type) \ 190 mtx_assert(&(pmap)->pm_mtx, (type)) 191 #define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx) 192 #define PMAP_LOCK_INIT(pmap) mtx_init(&(pmap)->pm_mtx, "pmap", \ 193 NULL, MTX_DEF | MTX_DUPOK) 194 #define PMAP_LOCKED(pmap) mtx_owned(&(pmap)->pm_mtx) 195 #define PMAP_MTX(pmap) (&(pmap)->pm_mtx) 196 #define PMAP_TRYLOCK(pmap) mtx_trylock(&(pmap)->pm_mtx) 197 #define PMAP_UNLOCK(pmap) mtx_unlock(&(pmap)->pm_mtx) 198 #endif 199 200 /* 201 * For each vm_page_t, there is a list of all currently valid virtual 202 * mappings of that page. An entry is a pv_entry_t, the list is pv_list. 203 */ 204 typedef struct pv_entry { 205 vm_offset_t pv_va; /* virtual address for mapping */ 206 TAILQ_ENTRY(pv_entry) pv_next; 207 } *pv_entry_t; 208 209 /* 210 * pv_entries are allocated in chunks per-process. This avoids the 211 * need to track per-pmap assignments. 212 */ 213 #define _NPCM 11 214 #define _NPCPV 336 215 struct pv_chunk { 216 pmap_t pc_pmap; 217 TAILQ_ENTRY(pv_chunk) pc_list; 218 uint32_t pc_map[_NPCM]; /* bitmap; 1 = free */ 219 TAILQ_ENTRY(pv_chunk) pc_lru; 220 struct pv_entry pc_pventry[_NPCPV]; 221 }; 222 223 #ifdef _KERNEL 224 225 extern char *ptvmmap; /* poor name! */ 226 extern vm_offset_t virtual_avail; 227 extern vm_offset_t virtual_end; 228 229 #define pmap_page_get_memattr(m) ((vm_memattr_t)(m)->md.pat_mode) 230 #define pmap_page_is_write_mapped(m) (((m)->a.flags & PGA_WRITEABLE) != 0) 231 #define pmap_unmapbios(va, sz) pmap_unmapdev((va), (sz)) 232 233 static inline int 234 pmap_vmspace_copy(pmap_t dst_pmap __unused, pmap_t src_pmap __unused) 235 { 236 237 return (0); 238 } 239 240 struct sf_buf; 241 242 /* 243 * Only the following functions or macros may be used before pmap_bootstrap() 244 * is called: pmap_kenter(), pmap_kextract(), pmap_kremove(), vtophys(), and 245 * vtopte(). 246 */ 247 void pmap_activate_boot(pmap_t pmap); 248 void pmap_basemem_setup(u_int basemem); 249 void *pmap_bios16_enter(void); 250 void pmap_bios16_leave(void *handle); 251 void pmap_bootstrap(vm_paddr_t); 252 int pmap_cache_bits(pmap_t, int mode, boolean_t is_pde); 253 int pmap_change_attr(vm_offset_t, vm_size_t, int); 254 caddr_t pmap_cmap3(vm_paddr_t pa, u_int pte_bits); 255 void pmap_cp_slow0_map(vm_offset_t kaddr, int plen, vm_page_t *ma); 256 void pmap_flush_page(vm_page_t m); 257 u_int pmap_get_kcr3(void); 258 u_int pmap_get_cr3(pmap_t); 259 vm_offset_t pmap_get_map_low(void); 260 vm_offset_t pmap_get_vm_maxuser_address(void); 261 void pmap_init_pat(void); 262 void pmap_kenter(vm_offset_t va, vm_paddr_t pa); 263 void *pmap_kenter_temporary(vm_paddr_t pa, int i); 264 vm_paddr_t pmap_kextract(vm_offset_t va); 265 void pmap_kremove(vm_offset_t); 266 void pmap_ksetrw(vm_offset_t va); 267 void *pmap_mapbios(vm_paddr_t, vm_size_t); 268 void *pmap_mapdev(vm_paddr_t, vm_size_t); 269 void *pmap_mapdev_attr(vm_paddr_t, vm_size_t, int); 270 boolean_t pmap_page_is_mapped(vm_page_t m); 271 void pmap_page_set_memattr(vm_page_t m, vm_memattr_t ma); 272 vm_paddr_t pmap_pg_frame(vm_paddr_t pa); 273 bool pmap_ps_enabled(pmap_t pmap); 274 void pmap_remap_lower(bool); 275 void pmap_remap_lowptdi(bool); 276 void pmap_set_nx(void); 277 void pmap_sf_buf_map(struct sf_buf *sf); 278 void pmap_unmapdev(vm_offset_t, vm_size_t); 279 void pmap_invalidate_page(pmap_t, vm_offset_t); 280 void pmap_invalidate_range(pmap_t, vm_offset_t, vm_offset_t); 281 void pmap_invalidate_all(pmap_t); 282 void pmap_invalidate_cache(void); 283 void pmap_invalidate_cache_pages(vm_page_t *pages, int count); 284 void pmap_invalidate_cache_range(vm_offset_t sva, vm_offset_t eva); 285 void pmap_force_invalidate_cache_range(vm_offset_t sva, vm_offset_t eva); 286 void *pmap_trm_alloc(size_t size, int flags); 287 void pmap_trm_free(void *addr, size_t size); 288 289 void invltlb_glob(void); 290 291 struct thread; 292 293 extern int pae_mode; 294 extern int i386_pmap_VM_NFREEORDER; 295 extern int i386_pmap_VM_LEVEL_0_ORDER; 296 extern int i386_pmap_PDRSHIFT; 297 298 #endif /* _KERNEL */ 299 300 #endif /* !LOCORE */ 301 302 #endif /* !_MACHINE_PMAP_H_ */ 303