The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/pmap.h

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    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 /* Our various interpretations of the above */
   71 #define PG_W            PG_AVAIL1       /* "Wired" pseudoflag */
   72 #define PG_MANAGED      PG_AVAIL2
   73 #define PG_PROMOTED     PG_AVAIL3       /* PDE only */
   74 
   75 #define PG_PROT         (PG_RW|PG_U)    /* all protection bits . */
   76 #define PG_N            (PG_NC_PWT|PG_NC_PCD)   /* Non-cacheable */
   77 
   78 /* Page level cache control fields used to determine the PAT type */
   79 #define PG_PDE_CACHE    (PG_PDE_PAT | PG_NC_PWT | PG_NC_PCD)
   80 #define PG_PTE_CACHE    (PG_PTE_PAT | PG_NC_PWT | PG_NC_PCD)
   81 
   82 /*
   83  * Promotion to a 2 or 4MB (PDE) page mapping requires that the corresponding
   84  * 4KB (PTE) page mappings have identical settings for the following fields:
   85  */
   86 #define PG_PTE_PROMOTE  (PG_MANAGED | PG_W | PG_G | PG_PTE_PAT | \
   87             PG_M | PG_A | PG_NC_PCD | PG_NC_PWT | PG_U | PG_RW | PG_V)
   88 
   89 /*
   90  * Page Protection Exception bits
   91  */
   92 
   93 #define PGEX_P          0x01    /* Protection violation vs. not present */
   94 #define PGEX_W          0x02    /* during a Write cycle */
   95 #define PGEX_U          0x04    /* access from User mode (UPL) */
   96 #define PGEX_RSV        0x08    /* reserved PTE field is non-zero */
   97 #define PGEX_I          0x10    /* during an instruction fetch */
   98 
   99 /*
  100  * Pte related macros
  101  */
  102 #define VADDR(pdi, pti) ((vm_offset_t)(((pdi)<<PDRSHIFT)|((pti)<<PAGE_SHIFT)))
  103 
  104 #ifndef NKPDE
  105 #define NKPDE   (KVA_PAGES)     /* number of page tables/pde's */
  106 #endif
  107 
  108 #define PDRSHIFT_PAE            21              /* LOG2(NBPDR) */
  109 #define PG_FRAME_PAE            (0x000ffffffffff000ull)
  110 #define PG_PS_FRAME_PAE         (0x000fffffffe00000ull)
  111 
  112 #define PDRSHIFT_NOPAE          22
  113 #define PG_FRAME_NOPAE          (~PAGE_MASK)
  114 #define PG_PS_FRAME_NOPAE       (0xffc00000)
  115 
  116 /*
  117  * The *PTDI values control the layout of virtual memory
  118  */
  119 #define KPTDI           0               /* start of kernel virtual pde's */
  120 /* ptd entry that points to ptd */
  121 #define PTDPTDI         (NPDEPTD - NTRPPTD - NPGPTD)
  122 #define TRPTDI          (NPDEPTD - NTRPPTD)     /* u/k trampoline ptd */
  123 
  124 /*
  125  * XXX doesn't really belong here I guess...
  126  */
  127 #define ISA_HOLE_START    0xa0000
  128 #define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START)
  129 
  130 #ifndef LOCORE
  131 
  132 #include <sys/queue.h>
  133 #include <sys/_cpuset.h>
  134 #include <sys/_lock.h>
  135 #include <sys/_mutex.h>
  136 #include <sys/_pv_entry.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 md_page {
  162         TAILQ_HEAD(,pv_entry)   pv_list;
  163         int                     pat_mode;
  164 };
  165 
  166 struct pmap {
  167         cpuset_t                pm_active;      /* active on cpus */
  168         struct mtx              pm_mtx;
  169         struct pmap_statistics  pm_stats;       /* pmap statistics */
  170         uint32_t                *pm_pdir_nopae; /* KVA of page directory */
  171         uint64_t                *pm_pdir_pae;
  172         TAILQ_HEAD(,pv_chunk)   pm_pvchunk;     /* list of mappings in pmap */
  173         LIST_ENTRY(pmap)        pm_list;        /* List of all pmaps */
  174         uint64_t                *pm_pdpt_pae;
  175         struct vm_radix         pm_root;        /* spare page table pages */
  176         vm_page_t               pm_ptdpg[4];    /* PAE NPGPTD */
  177 };
  178 
  179 typedef struct pmap     *pmap_t;
  180 
  181 #ifdef _KERNEL
  182 extern struct pmap      kernel_pmap_store;
  183 #define kernel_pmap     (&kernel_pmap_store)
  184 
  185 #define PMAP_LOCK(pmap)         mtx_lock(&(pmap)->pm_mtx)
  186 #define PMAP_LOCK_ASSERT(pmap, type) \
  187                                 mtx_assert(&(pmap)->pm_mtx, (type))
  188 #define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx)
  189 #define PMAP_LOCK_INIT(pmap)    mtx_init(&(pmap)->pm_mtx, "pmap", \
  190                                     NULL, MTX_DEF | MTX_DUPOK)
  191 #define PMAP_LOCKED(pmap)       mtx_owned(&(pmap)->pm_mtx)
  192 #define PMAP_MTX(pmap)          (&(pmap)->pm_mtx)
  193 #define PMAP_TRYLOCK(pmap)      mtx_trylock(&(pmap)->pm_mtx)
  194 #define PMAP_UNLOCK(pmap)       mtx_unlock(&(pmap)->pm_mtx)
  195 
  196 extern char *ptvmmap;           /* poor name! */
  197 extern vm_offset_t virtual_avail;
  198 extern vm_offset_t virtual_end;
  199 
  200 #define pmap_page_get_memattr(m)        ((vm_memattr_t)(m)->md.pat_mode)
  201 #define pmap_page_is_write_mapped(m)    (((m)->a.flags & PGA_WRITEABLE) != 0)
  202 #define pmap_unmapbios(va, sz)  pmap_unmapdev((va), (sz))
  203 
  204 static inline int
  205 pmap_vmspace_copy(pmap_t dst_pmap __unused, pmap_t src_pmap __unused)
  206 {
  207 
  208         return (0);
  209 }
  210 
  211 struct sf_buf;
  212 
  213 #define pmap_vm_page_alloc_check(m)
  214 
  215 /*
  216  * Only the following functions or macros may be used before pmap_bootstrap()
  217  * is called: pmap_kenter(), pmap_kextract(), pmap_kremove(), vtophys(), and
  218  * vtopte().
  219  */
  220 void    pmap_activate_boot(pmap_t pmap);
  221 void    pmap_basemem_setup(u_int basemem);
  222 void    *pmap_bios16_enter(void);
  223 void    pmap_bios16_leave(void *handle);
  224 void    pmap_bootstrap(vm_paddr_t);
  225 int     pmap_cache_bits(pmap_t, int mode, boolean_t is_pde);
  226 int     pmap_change_attr(vm_offset_t, vm_size_t, int);
  227 caddr_t pmap_cmap3(vm_paddr_t pa, u_int pte_bits);
  228 void    pmap_cp_slow0_map(vm_offset_t kaddr, int plen, vm_page_t *ma);
  229 void    pmap_flush_page(vm_page_t m);
  230 u_int   pmap_get_kcr3(void);
  231 u_int   pmap_get_cr3(pmap_t);
  232 vm_offset_t pmap_get_map_low(void);
  233 vm_offset_t pmap_get_vm_maxuser_address(void);
  234 void    pmap_init_pat(void);
  235 void    pmap_kenter(vm_offset_t va, vm_paddr_t pa);
  236 void    *pmap_kenter_temporary(vm_paddr_t pa, int i);
  237 vm_paddr_t pmap_kextract(vm_offset_t va);
  238 void    pmap_kremove(vm_offset_t);
  239 void    pmap_ksetrw(vm_offset_t va);
  240 void    *pmap_mapbios(vm_paddr_t, vm_size_t);
  241 void    *pmap_mapdev(vm_paddr_t, vm_size_t);
  242 void    *pmap_mapdev_attr(vm_paddr_t, vm_size_t, int);
  243 boolean_t pmap_page_is_mapped(vm_page_t m);
  244 void    pmap_page_set_memattr(vm_page_t m, vm_memattr_t ma);
  245 vm_paddr_t pmap_pg_frame(vm_paddr_t pa);
  246 bool    pmap_ps_enabled(pmap_t pmap);
  247 void    pmap_remap_lower(bool);
  248 void    pmap_remap_lowptdi(bool);
  249 void    pmap_set_nx(void);
  250 void    pmap_sf_buf_map(struct sf_buf *sf);
  251 void    pmap_unmapdev(void *, vm_size_t);
  252 void    pmap_invalidate_page(pmap_t, vm_offset_t);
  253 void    pmap_invalidate_range(pmap_t, vm_offset_t, vm_offset_t);
  254 void    pmap_invalidate_all(pmap_t);
  255 void    pmap_invalidate_cache(void);
  256 void    pmap_invalidate_cache_pages(vm_page_t *pages, int count);
  257 void    pmap_invalidate_cache_range(vm_offset_t sva, vm_offset_t eva);
  258 void    pmap_force_invalidate_cache_range(vm_offset_t sva, vm_offset_t eva);
  259 void    *pmap_trm_alloc(size_t size, int flags);
  260 void    pmap_trm_free(void *addr, size_t size);
  261 
  262 void    invltlb_glob(void);
  263 
  264 struct thread;
  265 
  266 extern int pae_mode;
  267 extern int i386_pmap_VM_NFREEORDER;
  268 extern int i386_pmap_VM_LEVEL_0_ORDER;
  269 extern int i386_pmap_PDRSHIFT;
  270 
  271 #endif /* _KERNEL */
  272 
  273 #endif /* !LOCORE */
  274 
  275 #endif /* !_MACHINE_PMAP_H_ */

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