PMAP(9)			 BSD Kernel Developer's Manual		       PMAP(9)

NAME
     pmap — machine-dependent portion of virtual memory subsystem

SYNOPSIS
     #include <sys/param.h>
     #include <vm/vm.h>
     #include <vm/pmap.h>

DESCRIPTION
     The pmap module is the machine-dependent portion of the FreeBSD VM (Vir‐
     tual Memory) sub-system.  Each function documented herein must have its
     own architecture-dependent implementation.

     The pmap module is responsible for managing hardware-dependent objects
     such as page tables, address maps, TLBs, etc.

     Machine-dependent code must provide the header file <machine/pmap.h>.
     This file contains the definition of the pmap structure:

	   struct pmap {
		   /* Contents defined by pmap implementation. */
	   };
	   typedef struct pmap *pmap_t;

     This header file may also define other data structures used by the pmap
     implementation.

     The header file <vm/pmap.h> defines a structure for tracking pmap statis‐
     tics (see below).	This structure is defined as:

	   struct pmap_statistics {
		   long	       resident_count; /* number of mapped pages */
		   long	       wired_count;    /* number of wired pages */
	   };

     The implementation's struct pmap must contain an instance of this struc‐
     ture having the name pm_stats, and it must be updated by the implementa‐
     tion after each relevant pmap operation.

SEE ALSO
     pmap(9), pmap_activate(9), pmap_change_wiring(9), pmap_clear_modify(9),
     pmap_clear_reference(9), pmap_copy(9), pmap_copy_page(9), pmap_enter(9),
     pmap_extract(9), pmap_extract_and_hold(9), pmap_growkernel(9),
     pmap_init(9), pmap_init2(9), pmap_is_modified(9),
     pmap_is_prefaultable(9), pmap_map(9), pmap_mincore(9),
     pmap_object_init_pt(9), pmap_page_exists_quick(9), pmap_page_init(9),
     pmap_page_protect(9), pmap_pinit(9), pmap_pinit0(9), pmap_pinit2(9),
     pmap_protect(9), pmap_qenter(9), pmap_qremove(9), pmap_release(9),
     pmap_remove(9), pmap_remove_all(9), pmap_remove_pages(9),
     pmap_resident_count(9), pmap_ts_modified(9), pmap_wired_count(9),
     pmap_zero_area(9), pmap_zero_idle(9), pmap_zero_page(9), vm_map(9)

AUTHORS
     This manual page was written by Bruce M Simpson ⟨bms@spc.org⟩.

BSD				 July 21, 2003				   BSD

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