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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
     (Virtual 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 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 #include <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.

SEE ALSO

     pmap(9), pmap_activate(9), pmap_addr_hint(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〉.