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     pmap — machine-dependent portion of virtual memory subsystem


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


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

     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 statistics (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 structure having the name
     pm_stats, and it must be updated by the implementation after each relevant pmap operation.


     pmap(9), pmap_activate(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_unwire(9), pmap_wired_count(9),
     pmap_zero_area(9), pmap_zero_idle(9), pmap_zero_page(9), vm_map(9)


     This manual page was written by Bruce M Simpson <>.