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DESCRIPTION

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.