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Annotation of sys/arch/mips64/include/pmap.h, Revision 1.1.1.1

1.1       nbrk        1: /*      $OpenBSD: pmap.h,v 1.12 2007/04/27 18:14:11 miod Exp $ */
                      2:
                      3: /*
                      4:  * Copyright (c) 1987 Carnegie-Mellon University
                      5:  * Copyright (c) 1992, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * This code is derived from software contributed to Berkeley by
                      9:  * Ralph Campbell.
                     10:  *
                     11:  * Redistribution and use in source and binary forms, with or without
                     12:  * modification, are permitted provided that the following conditions
                     13:  * are met:
                     14:  * 1. Redistributions of source code must retain the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer.
                     16:  * 2. Redistributions in binary form must reproduce the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer in the
                     18:  *    documentation and/or other materials provided with the distribution.
                     19:  * 3. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  *
                     35:  *     from: @(#)pmap.h        8.1 (Berkeley) 6/10/93
                     36:  */
                     37:
                     38: #ifndef        _MIPS_PMAP_H_
                     39: #define        _MIPS_PMAP_H_
                     40:
                     41: #ifdef _KERNEL
                     42:
                     43: /*
                     44:  * The user address space is 2Gb (0x0 - 0x80000000).
                     45:  * User programs are laid out in memory as follows:
                     46:  *                     address
                     47:  *     USRTEXT         0x00400000
                     48:  *     USRDATA         0x10000000
                     49:  *     USRSTACK        0x7FFFFFFF
                     50:  *
                     51:  * The user address space is mapped using a two level structure where
                     52:  * virtual address bits 30..22 are used to index into a segment table which
                     53:  * points to a page worth of PTEs (4096 page can hold 1024 PTEs).
                     54:  * Bits 21..12 are then used to index a PTE which describes a page within
                     55:  * a segment.
                     56:  *
                     57:  * The wired entries in the TLB will contain the following:
                     58:  *     0-1     (UPAGES)        for curproc user struct and kernel stack.
                     59:  *
                     60:  * Note: The kernel doesn't use the same data structures as user programs.
                     61:  * All the PTE entries are stored in a single array in Sysmap which is
                     62:  * dynamically allocated at boot time.
                     63:  */
                     64:
                     65: #define mips_trunc_seg(x)      ((vaddr_t)(x) & ~SEGOFSET)
                     66: #define mips_round_seg(x)      (((vaddr_t)(x) + SEGOFSET) & ~SEGOFSET)
                     67: #define pmap_segmap(m, v)      ((m)->pm_segtab->seg_tab[((v) >> SEGSHIFT)])
                     68:
                     69: #define PMAP_SEGTABSIZE                512
                     70:
                     71: union pt_entry;
                     72:
                     73: struct segtab {
                     74:        union pt_entry  *seg_tab[PMAP_SEGTABSIZE];
                     75: };
                     76:
                     77: /*
                     78:  * Machine dependent pmap structure.
                     79:  */
                     80: typedef struct pmap {
                     81:        int                     pm_count;       /* pmap reference count */
                     82:        simple_lock_data_t      pm_lock;        /* lock on pmap */
                     83:        struct pmap_statistics  pm_stats;       /* pmap statistics */
                     84:        int                     pm_tlbpid;      /* address space tag */
                     85:        u_int                   pm_tlbgen;      /* TLB PID generation number */
                     86:        struct segtab           *pm_segtab;     /* pointers to pages of PTEs */
                     87: } *pmap_t;
                     88:
                     89:
                     90: /* flags for pv_entry */
                     91: #define        PV_UNCACHED     PG_PMAP0        /* Page is mapped unchached */
                     92: #define        PV_CACHED       PG_PMAP1        /* Page has been cached */
                     93: #define        PV_ATTR_MOD     PG_PMAP2
                     94: #define        PV_ATTR_REF     PG_PMAP3
                     95: #define        PV_PRESERVE     (PV_ATTR_MOD | PV_ATTR_REF)
                     96:
                     97: extern struct pmap kernel_pmap_store;
                     98:
                     99: #define pmap_resident_count(pmap)       ((pmap)->pm_stats.resident_count)
                    100: #define        pmap_wired_count(pmap)          ((pmap)->pm_stats.wired_count)
                    101: #define pmap_kernel()                  (&kernel_pmap_store)
                    102: #define        pmap_phys_address(ppn)          ptoa(ppn)
                    103:
                    104: #define        PMAP_STEAL_MEMORY               /* Enable 'stealing' during boot */
                    105:
                    106: #define PMAP_PREFER(pa, va)            pmap_prefer(pa, va)
                    107:
                    108: #define        pmap_update(x)                  do { /* nothing */ } while (0)
                    109:
                    110: void   pmap_bootstrap(void);
                    111: int    pmap_is_page_ro( pmap_t, vaddr_t, int);
                    112: void   pmap_kenter_cache(vaddr_t va, paddr_t pa, vm_prot_t prot, int cache);
                    113: void   pmap_prefer(vaddr_t, vaddr_t *);
                    114: void   pmap_set_modify(vm_page_t);
                    115: void   pmap_page_cache(vm_page_t, int);
                    116:
                    117: #define        pmap_collect(x)                 do { /* nothing */ } while (0)
                    118: #define pmap_proc_iflush(p,va,len)     do { /* nothing yet (handled in trap now) */ } while (0)
                    119: #define pmap_unuse_final(p)            do { /* nothing yet */ } while (0)
                    120:
                    121: #endif /* _KERNEL */
                    122:
                    123: #endif /* !_MIPS_PMAP_H_ */