* Copyright (c) 1994 Ludd, University of Lule}, Sweden.

/* $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