FreeBSD/Linux Kernel Cross Reference
sys/uvm/uvm.h

     /*      $NetBSD: uvm.h,v 1.37 2004/02/10 01:30:49 matt Exp $    */
     
     /*
      *
      * Copyright (c) 1997 Charles D. Cranor and Washington University.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Charles D. Cranor and
     *      Washington University.
     * 4. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * from: Id: uvm.h,v 1.1.2.14 1998/02/02 20:07:19 chuck Exp
     */
    
    #ifndef _UVM_UVM_H_
    #define _UVM_UVM_H_
    
    #if defined(_KERNEL_OPT)
    #include "opt_lockdebug.h"
    #include "opt_multiprocessor.h"
    #include "opt_uvmhist.h"
    #endif
    
    #include <uvm/uvm_extern.h>
    
    #include <uvm/uvm_stat.h>
    
    /*
     * pull in prototypes
     */
    
    #include <uvm/uvm_amap.h>
    #include <uvm/uvm_aobj.h>
    #include <uvm/uvm_fault.h>
    #include <uvm/uvm_glue.h>
    #include <uvm/uvm_km.h>
    #include <uvm/uvm_loan.h>
    #include <uvm/uvm_map.h>
    #include <uvm/uvm_object.h>
    #include <uvm/uvm_page.h>
    #include <uvm/uvm_pager.h>
    #include <uvm/uvm_pdaemon.h>
    #include <uvm/uvm_swap.h>
    
    #ifdef _KERNEL
    
    /*
     * pull in VM_NFREELIST
     */
    #include <machine/vmparam.h>
    
    /*
     * uvm structure (vm global state: collected in one structure for ease
     * of reference...)
     */
    
    struct uvm {
            /* vm_page related parameters */
    
                    /* vm_page queues */
            struct pgfreelist page_free[VM_NFREELIST]; /* unallocated pages */
            int page_free_nextcolor;        /* next color to allocate from */
            struct pglist page_active;      /* allocated pages, in use */
            struct pglist page_inactive;    /* pages between the clock hands */
            struct simplelock pageqlock;    /* lock for active/inactive page q */
            struct simplelock fpageqlock;   /* lock for free page q */
            boolean_t page_init_done;       /* TRUE if uvm_page_init() finished */
            boolean_t page_idle_zero;       /* TRUE if we should try to zero
                                               pages in the idle loop */
    
                    /* page daemon trigger */
            int pagedaemon;                 /* daemon sleeps on this */
            struct proc *pagedaemon_proc;   /* daemon's pid */
            struct simplelock pagedaemon_lock;
    
                    /* aiodone daemon trigger */
            int aiodoned;                   /* daemon sleeps on this */
           struct proc *aiodoned_proc;     /* daemon's pid */
           struct simplelock aiodoned_lock;
   
                   /* page hash */
           struct pglist *page_hash;       /* page hash table (vp/off->page) */
           int page_nhash;                 /* number of buckets */
           int page_hashmask;              /* hash mask */
           struct simplelock hashlock;     /* lock on page_hash array */
   
           /* anon stuff */
           struct vm_anon *afree;          /* anon free list */
           struct simplelock afreelock;    /* lock on anon free list */
   
           /* static kernel map entry pool */
           struct vm_map_entry *kentry_free;       /* free page pool */
           struct simplelock kentry_lock;
   
           /* aio_done is locked by uvm.pagedaemon_lock and splbio! */
           TAILQ_HEAD(, buf) aio_done;             /* done async i/o reqs */
   
           /* swap-related items */
           struct simplelock swap_data_lock;
   
           /* kernel object: to support anonymous pageable kernel memory */
           struct uvm_object *kernel_object;
   };
   
   #endif /* _KERNEL */
   
   /*
    * vm_map_entry etype bits:
    */
   
   #define UVM_ET_OBJ              0x01    /* it is a uvm_object */
   #define UVM_ET_SUBMAP           0x02    /* it is a vm_map submap */
   #define UVM_ET_COPYONWRITE      0x04    /* copy_on_write */
   #define UVM_ET_NEEDSCOPY        0x08    /* needs_copy */
   
   #define UVM_ET_ISOBJ(E)         (((E)->etype & UVM_ET_OBJ) != 0)
   #define UVM_ET_ISSUBMAP(E)      (((E)->etype & UVM_ET_SUBMAP) != 0)
   #define UVM_ET_ISCOPYONWRITE(E) (((E)->etype & UVM_ET_COPYONWRITE) != 0)
   #define UVM_ET_ISNEEDSCOPY(E)   (((E)->etype & UVM_ET_NEEDSCOPY) != 0)
   
   #ifdef _KERNEL
   
   /*
    * holds all the internal UVM data
    */
   extern struct uvm uvm;
   
   /*
    * historys
    */
   
   #ifdef UVMHIST
   UVMHIST_DECL(maphist);
   UVMHIST_DECL(pdhist);
   UVMHIST_DECL(ubchist);
   #endif
   
   /*
    * UVM_UNLOCK_AND_WAIT: atomic unlock+wait... wrapper around the
    * interlocked tsleep() function.
    */
   
   #define UVM_UNLOCK_AND_WAIT(event, slock, intr, msg, timo)              \
   do {                                                                    \
           (void) ltsleep(event, PVM | PNORELOCK | (intr ? PCATCH : 0),    \
               msg, timo, slock);                                          \
   } while (/*CONSTCOND*/ 0)
   
   /*
    * UVM_KICK_PDAEMON: perform checks to determine if we need to
    * give the pagedaemon a nudge, and do so if necessary.
    */
   
   #define UVM_KICK_PDAEMON()                                              \
   do {                                                                    \
           if (uvmexp.free + uvmexp.paging < uvmexp.freemin ||             \
               (uvmexp.free + uvmexp.paging < uvmexp.freetarg &&           \
                uvmexp.inactive < uvmexp.inactarg)) {                      \
                   wakeup(&uvm.pagedaemon);                                \
           }                                                               \
   } while (/*CONSTCOND*/0)
   
   /*
    * UVM_PAGE_OWN: track page ownership (only if UVM_PAGE_TRKOWN)
    */
   
   #if defined(UVM_PAGE_TRKOWN)
   #define UVM_PAGE_OWN(PG, TAG) uvm_page_own(PG, TAG)
   #else
   #define UVM_PAGE_OWN(PG, TAG) /* nothing */
   #endif /* UVM_PAGE_TRKOWN */
   
   #endif /* _KERNEL */
   
   #endif /* _UVM_UVM_H_ */
   
   /*
    * pull in inlines
    */
   
   #ifdef _KERNEL
   
   #include <uvm/uvm_amap_i.h>
   #include <uvm/uvm_fault_i.h>
   #include <uvm/uvm_map_i.h>
   #include <uvm/uvm_page_i.h>
   #include <uvm/uvm_pager_i.h>
   
   #endif /* _KERNEL */
   

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