IABSD.fr/src/sys/uvm/uvm.h

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• Author : deraadt
  Date : 2024-04-02 08:39:16
  Hash : 30d20579
  Message : Delete the msyscall mechanism entirely, since mimmutable+pinsyscalls has replaced it with a more strict mechanism, which happens to be lockless O(1) rather than micro-lock O(1)+O(log N). Also nop-out the sys_msyscall(2) guts, but leave the syscall around for a bit longer so that people can build through it, since ld.so(1) still wants to call it.

• sys/uvm/uvm.h

• /*	$OpenBSD: uvm.h,v 1.73 2024/04/02 08:39:17 deraadt Exp $	*/
  /*	$NetBSD: uvm.h,v 1.24 2000/11/27 08:40:02 chs 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.
   *
   * 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_
  
  #include <uvm/uvm_extern.h>
  #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_swap.h>
  
  #include <uvm/uvm_pmemrange.h>
  
  /*
   * uvm structure (vm global state: collected in one structure for ease
   * of reference...)
   *
   *  Locks used to protect struct members in this file:
   *	Q	uvm.pageqlock
   *	F	uvm.fpageqlock
   */
  struct uvm {
  	/* vm_page related parameters */
  
  	/* vm_page queues */
  	struct pglist page_active;	/* [Q] allocated pages, in use */
  	struct pglist page_inactive;	/* [Q] pages inactive (reclaim/free) */
  	/* Lock order: pageqlock, then fpageqlock. */
  	struct mutex pageqlock;		/* [] lock for active/inactive page q */
  	struct mutex fpageqlock;	/* [] lock for free page q  + pdaemon */
  	boolean_t page_init_done;	/* TRUE if uvm_page_init() finished */
  	struct uvm_pmr_control pmr_control; /* [F] pmemrange data */
  
  		/* page daemon trigger */
  	int pagedaemon;			/* daemon sleeps on this */
  	struct proc *pagedaemon_proc;	/* daemon's pid */
  
  		/* aiodone daemon trigger */
  	int aiodoned;			/* daemon sleeps on this */
  	struct proc *aiodoned_proc;	/* daemon's pid */
  	struct mutex aiodoned_lock;
  
  	/* static kernel map entry pool */
  	SLIST_HEAD(, vm_map_entry) kentry_free; /* free page pool */
  
  	/* aio_done is locked by uvm.aiodoned_lock. */
  	TAILQ_HEAD(, buf) aio_done;		/* done async i/o reqs */
  
  	/* kernel object: to support anonymous pageable kernel memory */
  	struct uvm_object *kernel_object;
  };
  
  /*
   * vm_map_entry etype bits:
   */
  #define UVM_ET_OBJ		0x0001	/* it is a uvm_object */
  #define UVM_ET_SUBMAP		0x0002	/* it is a vm_map submap */
  #define UVM_ET_COPYONWRITE 	0x0004	/* copy_on_write */
  #define UVM_ET_NEEDSCOPY	0x0008	/* needs_copy */
  #define UVM_ET_HOLE		0x0010	/* no backend */
  #define UVM_ET_NOFAULT		0x0020	/* don't fault */
  #define UVM_ET_STACK		0x0040	/* this is a stack */
  #define UVM_ET_WC		0x0080	/* write combining */
  #define UVM_ET_CONCEAL		0x0100	/* omit from dumps */
  #define UVM_ET_IMMUTABLE	0x0400	/* entry may not be changed */
  #define UVM_ET_FREEMAPPED	0x8000	/* map entry is on free list (DEBUG) */
  
  #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)
  #define UVM_ET_ISHOLE(E)	(((E)->etype & UVM_ET_HOLE) != 0)
  #define UVM_ET_ISNOFAULT(E)	(((E)->etype & UVM_ET_NOFAULT) != 0)
  #define UVM_ET_ISSTACK(E)	(((E)->etype & UVM_ET_STACK) != 0)
  #define UVM_ET_ISWC(E)		(((E)->etype & UVM_ET_WC) != 0)
  #define UVM_ET_ISCONCEAL(E)	(((E)->etype & UVM_ET_CONCEAL) != 0)
  
  #ifdef _KERNEL
  
  /*
   * holds all the internal UVM data
   */
  extern struct uvm uvm;
  
  /*
   * 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 */
  
  /*
   * uvm_map internal functions.
   * Used by uvm_map address selectors.
   */
  struct vm_map_entry	*uvm_map_entrybyaddr(struct uvm_map_addr *, vaddr_t);
  int			 uvm_map_isavail(struct vm_map *,
  			    struct uvm_addr_state *,
  			    struct vm_map_entry **, struct vm_map_entry**,
  			    vaddr_t, vsize_t);
  struct uvm_addr_state	*uvm_map_uaddr(struct vm_map *, vaddr_t);
  struct uvm_addr_state	*uvm_map_uaddr_e(struct vm_map *, struct vm_map_entry *);
  
  #define VMMAP_FREE_START(_entry)	((_entry)->end + (_entry)->guard)
  #define VMMAP_FREE_END(_entry)		((_entry)->end + (_entry)->guard + \
  					    (_entry)->fspace)
  
  #endif /* _KERNEL */
  
  #endif /* _UVM_UVM_H_ */