/*      $NetBSD: pte.h,v 1.24 2017/05/22 17:12:11 ragge Exp $     */

/*
 * Copyright (c) 1994 Ludd, University of Lule}, Sweden.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _VAX_PTE_H_
#define _VAX_PTE_H_

#ifndef _LOCORE
/*
 * VAX page table entries
 */
struct pte {
        unsigned int    pg_pfn:21;      /* Page Frame Number or 0 */
        unsigned int    pg_illegal:2;   /* Don't use this bits */
        unsigned int    pg_sref:1;      /* Help for ref simulation */
        unsigned int    pg_w:1;         /* Wired bit */
        unsigned int    pg_z:1;         /* Zero DIGITAL = 0 */
        unsigned int    pg_m:1;         /* Modify DIGITAL */
        unsigned int    pg_prot:4;      /* reserved at zero */
        unsigned int    pg_v:1;         /* valid bit */
};


typedef struct pte      pt_entry_t;     /* Mach page table entry */

#endif /* _LOCORE */

#define PG_V            0x80000000
#define PG_NV           0x00000000
#define PG_PROT         0x78000000
#define PG_RW           0x20000000
#define PG_KW           0x10000000
#define PG_KR           0x18000000
#define PG_URKW         0x70000000
#define PG_RO           0x78000000
#define PG_NONE         0x00000000
#define PG_M            0x04000000
#define PG_W            0x01000000
#define PG_SREF         0x00800000
#define PG_ILLEGAL      0x00600000
#define PG_FRAME        0x001fffff
#define PG_PFNUM(x)     (((unsigned long)(x) & 0x3ffffe00) >> VAX_PGSHIFT)

#ifndef _LOCORE
extern pt_entry_t *Sysmap;
/*
 * Kernel virtual address to page table entry and to physical address.
 */
#endif

#ifdef __GNUC__
#define kvtopte(va)     kvtopte0((vaddr_t) (va))
static inline struct pte *
kvtopte0(vaddr_t va)
{
        struct pte *pt;
#ifdef _RUMPKERNEL
        __asm(
                "extzv $9,$21,%1,%0\n\t"
                "moval %2[%0],%0\n\t"
             : "=r"(pt)
             : "g"(va), "o"(*Sysmap));
#else
        __asm(
                "extzv $9,$21,%1,%0\n\t"
                "moval *Sysmap[%0],%0\n\t"
             : "=r"(pt)
             : "g"(va));
#endif
        return pt;
}

#define kvtophys(va)    kvtophys0((vaddr_t) (va))
static inline paddr_t
kvtophys0(vaddr_t va)
{
        paddr_t pa;
#ifdef _RUMPKERNEL
        __asm(
                "extzv $9,$21,%1,%0\n\t"
                "ashl $9,%2[%0],%0\n\t"
                "insv %1,$0,$9,%0\n\t"
            : "=&r"(pa)
            : "g"(va), "o"(*Sysmap) : "cc");
#else
        __asm(
                "extzv $9,$21,%1,%0\n\t"
                "ashl $9,*Sysmap[%0],%0\n\t"
                "insv %1,$0,$9,%0\n\t"
            : "=&r"(pa)
            : "g"(va) : "cc");
#endif
        return pa;
}
#else /* __GNUC__ */
#define kvtophys(va) \
        (((kvtopte(va))->pg_pfn << VAX_PGSHIFT) | ((paddr_t)(va) & VAX_PGOFSET))
#define kvtopte(va) (&Sysmap[PG_PFNUM(va)])
#endif /* __GNUC__ */
#define uvtopte(va, pcb) \
        (((vaddr_t)va < 0x40000000) ? \
        &(((pcb)->P0BR)[PG_PFNUM(va)]) : \
        &(((pcb)->P1BR)[PG_PFNUM(va)]))

#endif