usr/src/sys/luna68k/include/pmap.h

/*
 * Copyright (c) 1987 Carnegie-Mellon University
 * Copyright (c) 1992 OMRON Corporation.
 * Copyright (c) 1991, 1992 Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * %sccs.include.redist.c%
 *
 * from: hp300/include/pmap.h   7.11 (Berkeley) 12/27/92
 *
 *      @(#)pmap.h      7.3 (Berkeley) %G%
 */

#ifndef _PMAP_MACHINE_
#define _PMAP_MACHINE_

#define LUNA_PAGE_SIZE  NBPG
#define LUNA_SEG_SIZE   NBSEG

#define luna_trunc_seg(x)       (((unsigned)(x)) & ~(LUNA_SEG_SIZE-1))
#define luna_round_seg(x)       luna_trunc_seg((unsigned)(x) + LUNA_SEG_SIZE-1)

/*
 * Pmap stuff
 */
struct pmap {
        struct pte              *pm_ptab;       /* KVA of page table */
        struct ste              *pm_stab;       /* KVA of segment table */
        int                     pm_stchanged;   /* ST changed */
        int                     pm_stfree;      /* 040: free lev2 blocks */
        struct ste              *pm_stpa;       /* 040: ST phys addr */
        short                   pm_sref;        /* segment table ref count */
        short                   pm_count;       /* pmap reference count */
        simple_lock_data_t      pm_lock;        /* lock on pmap */
        struct pmap_statistics  pm_stats;       /* pmap statistics */
        long                    pm_ptpages;     /* more stats: PT pages */
};

typedef struct pmap     *pmap_t;

extern struct pmap      kernel_pmap_store;

#define kernel_pmap     (&kernel_pmap_store)
#define active_pmap(pm) \
        ((pm) == kernel_pmap || (pm) == curproc->p_vmspace->vm_map.pmap)

/*
 * On the 040 we keep track of which level 2 blocks are already in use
 * with the pm_stfree mask.  Bits are arranged from LSB (block 0) to MSB
 * (block 31).  For convenience, the level 1 table is considered to be
 * block 0.
 *
 * MAX[KU]L2SIZE control how many pages of level 2 descriptors are allowed.
 * for the kernel and users.  8 implies only the initial "segment table"
 * page is used.  WARNING: don't change MAXUL2SIZE unless you can allocate
 * physically contiguous pages for the ST in pmap.c!
 */
#define MAXKL2SIZE      16
#define MAXUL2SIZE      8
#define l2tobm(n)       (1 << (n))
#define bmtol2(n)       (ffs(n) - 1)

/*
 * Macros for speed
 */
#define PMAP_ACTIVATE(pmapp, pcbp, iscurproc) \
        if ((pmapp) != NULL && (pmapp)->pm_stchanged) { \
                (pcbp)->pcb_ustp = luna_btop((vm_offset_t)(pmapp)->pm_stpa); \
                if (iscurproc) \
                        loadustp((pcbp)->pcb_ustp); \
                (pmapp)->pm_stchanged = FALSE; \
        }
#define PMAP_DEACTIVATE(pmapp, pcbp)

/*
 * For each vm_page_t, there is a list of all currently valid virtual
 * mappings of that page.  An entry is a pv_entry_t, the list is pv_table.
 */
typedef struct pv_entry {
        struct pv_entry *pv_next;       /* next pv_entry */
        struct pmap     *pv_pmap;       /* pmap where mapping lies */
        vm_offset_t     pv_va;          /* virtual address for mapping */
        struct ste      *pv_ptste;      /* non-zero if VA maps a PT page */
        struct pmap     *pv_ptpmap;     /* if pv_ptste, pmap for PT page */
        int             pv_flags;       /* flags */
} *pv_entry_t;

#define PV_CI           0x01    /* header: all entries are cache inhibited */
#define PV_PTPAGE       0x02    /* header: entry maps a page table page */

#ifdef  KERNEL

pv_entry_t      pv_table;               /* array of entries, one per page */

#define pa_index(pa)            atop(pa - vm_first_phys)
#define pa_to_pvh(pa)           (&pv_table[pa_index(pa)])

#define pmap_resident_count(pmap)       ((pmap)->pm_stats.resident_count)

extern  struct pte *Sysmap;
extern  char *vmmap;                    /* map for mem, dumps, etc. */

/*
 * definitions LUNA IO space mapping
 */
struct physmap {
        int pm_phys;
        int pm_size;
        int pm_cache;
} ;

#endif

#endif  _PMAP_MACHINE_